Electric connector

Abstract

The retainability and electric connection reliability of a plate-shaped signal transmission medium can be increased by a simple configuration while the operability of an actuator is improved. Pre-pressing protruding portions which create a clicking sensation of a turning operation of the actuator are provided in part of a region in a longitudinal direction of the actuator so that the pressing force of the pre-pressing protruding portions with respect to the plate-shaped signal transmission medium is applied to the part in the longitudinal direction of the actuator, and the pressing force of the pre-pressing protruding portions with respect to the plate-shaped signal transmission medium is prevented from being largely increased even when the actuator is enlarged in the multipolar arrangement direction. As a result, the operating force for the actuator is reduced, and, on the other hand, the final fixation state of the plate-shaped signal transmission medium is configured to be good by maintaining the pressing force of the medium pressing portion.

Claims

1. An electric connector comprising: an insulating housing to which a plate-shaped signal transmission medium is to be inserted; a plurality of contact members arranged in multipolar shapes in the insulating housing; and an actuator attached to the insulating housing turnably about a turning center determined in advance and configured to be subjected to a turning operation from a standby position toward an acting position, the actuator provided with a medium pressing portion configured to be in a disposition relation that the medium pressing portion is pressed against and in contact with a surface of the plate-shaped signal transmission medium in a state in which the actuator is operated to be turned from the standby position to the acting position; wherein the actuator is provided with, in a vicinity part of a downstream side of the medium pressing portion in a direction of the turning operation, a pre-pressing protruding portion(s) that is projecting to a position having a longer distance from the turning center than that of the medium pressing portion and creates a clicking sensation of the turning operation; and the pre-pressing protruding portion is provided in part of a region in a longitudinal direction of the actuator that is a multipolar arrangement direction of the contact members.

2. The electric connector according to claim 1, wherein the pre-pressing protruding portions are disposed in both-side regions in the longitudinal direction of the actuator, and the pre-pressing protruding portion is not provided in a central region in the longitudinal direction of the actuator.

3. The electric connector according to claim 1, wherein the pre-pressing protruding portions are configured to be scattered at an interval determined in advance in the longitudinal direction of the actuator.

4. The electric connector according to claim 1, wherein the contact member is provided with a contact-point portion that is to be brought into pressure-contact with the plate-shaped signal transmission medium; and the pre-pressing protruding portion is provided with a deformation allowing portion formed by space that houses an elastically deformed part of the plate-shaped signal transmission medium in a state in which the contact-point portion of the contact member is in pressure-contact with the plate-shaped signal transmission medium.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an external perspective explanatory view showing an electric connector according to an embodiment of the present invention and showing, from a front side, an entire configuration of a case in which an actuator is pushed down to an acting position (closed position) in a state in which a plate-shaped signal transmission medium is not inserted;

(2) FIG. 2 is a front explanatory view of the electric connector in a closed state shown in FIG. 1;

(3) FIG. 3 is a lateral explanatory view of the electric connector in the closed state shown in FIG. 1 and FIG. 2;

(4) FIG. 4 is a plan explanatory view of the electric connector in the closed state shown in FIG. 1 to FIG. 3;

(5) FIG. 5 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line V-V in FIG. 2;

(6) FIG. 6 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line VI-VI in FIG. 2;

(7) FIG. 7 is an external perspective explanatory view showing, from a front side, an entire configuration in a state in which the actuator of the electric connector shown in FIG. 1 to FIG. 6 is flipped up to a standby position (open position);

(8) FIG. 8 is a front explanatory view showing the electric connector in the actuator open state shown in FIG. 7;

(9) FIG. 9 is a lateral explanatory view of the electric connector in the actuator open state shown in FIG. 7 to FIG. 8;

(10) FIG. 10 is a front explanatory view of the electric connector in the actuator open state shown in FIG. 7 to FIG. 9;

(11) FIG. 11 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XI-XI in FIG. 8;

(12) FIG. 12 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XII-XII in FIG. 8;

(13) FIG. 13 is an external perspective explanatory view showing the actuator used in the electric connector shown in FIG. 1 to FIG. 12;

(14) FIG. 14 is a front explanatory view of the actuator shown in FIG. 13;

(15) FIG. 15 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XV-XV in FIG. 14;

(16) FIG. 16 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XVI-XVI in FIG. 14;

(17) FIG. 17 is a front explanatory view showing the electric connector in a state in which pre-pressing protruding portions of the actuator have started contacting the plate-shaped signal transmission medium while the actuator is being subjected to a closing turning operation after a terminal part of the plate-shaped signal transmission medium is inserted;

(18) FIG. 18 is a lateral explanatory view of the electric connector shown in FIG. 17;

(19) FIG. 19 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XIX-XIX in FIG. 17;

(20) FIG. 20 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XX-XX in FIG. 17;

(21) FIG. 21 is a front explanatory view showing the electric connector in a state in which medium pressing portions of the actuator have started contacting the plate-shaped signal transmission medium while the actuator is being subjected to the closing turning operation;

(22) FIG. 22 is a lateral explanatory view of the electric connector shown in FIG. 21;

(23) FIG. 23 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XXIII-XXIII in FIG. 21;

(24) FIG. 24 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XXIV-XXIV in FIG. 21;

(25) FIG. 25 is a front explanatory view showing the electric connector in a state in which the actuator has been subjected to the closing turning operation to the acting position (connected position) after the terminal part of the plate-shaped signal transmission medium is inserted;

(26) FIG. 26 is a lateral explanatory view of the electric connector shown in FIG. 25;

(27) FIG. 27 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XXIII-XXIII in FIG. 25; and

(28) FIG. 28 is an explanatory view showing, in an enlarged manner, a transverse cross section along a line XXIV-XXIV in FIG. 25.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(29) Hereinafter, an embodiment in which the present invention is applied to an electric connector, which is used by being mounted on a printed wiring board in order to carry out connection of a plate-shaped signal transmission medium composed of a flexible printed circuit (FPC), flexible flat cable (FFC), or the like, will be described in detail based on drawings.

(30) [About Overall Structure of Electric Connector]

(31) More specifically, an electric connector 10 according to an embodiment of the present invention shown in FIG. 1 to FIG. 6 is an electric connector having a so-called front-flip-type structure in which an actuator 12 serving as a connection operating means is attached to a front edge part (left edge part in FIG. 5 and FIG. 6) of an insulating housing 11, and the above described actuator (connection operating means) 12 is in a state in which the actuator 12 is turned so as to be pushed down toward a connector front end side (left end side in FIG. 5 and FIG. 6) to which a terminal part of a plate-shaped signal transmission medium (for example, FPC or FFC) F is to be inserted.

(32) The insulating housing 11 in this case is formed by a slenderly extending hollow-frame-shaped insulating member. A longitudinal direction of the insulating housing 11 will be hereinafter referred to as connector longitudinal direction, the terminal part of the plate-shaped signal transmission medium (for example, FPC or FFC) F is assumed to be inserted from connector front side toward connector rear side, and the inserting direction of the plate-shaped signal transmission medium F will be referred to as medium inserting direction. Furthermore, the terminal part of the plate-shaped signal transmission medium F is assumed to be removed from connector rear side toward connector front side, and the removing direction of the plate-shaped signal transmission medium F will be referred to as medium removing direction.

(33) Note that the electric connector 10 according to the present embodiment has a left-right symmetric structure in the connector longitudinal direction, and the same constituent members which are in left-right symmetric disposition relations will be described with the same reference signs.

(34) In the hollow shape of the insulating housing 11, a plurality of electrically-conductive contact members 13, 13, and so on are attached as contact members formed by thin-plate-shaped metal members having appropriate shapes. The plurality of electrically-conductive contact members 13, 13, and so on are disposed so as to form multipolar shapes with appropriate intervals therebetween along the connector longitudinal direction, and the electrically-conductive contact members 13 are respectively attached to a plurality of contact attachment grooves 11a, 11a, and so on formed on a bottom-portion inner wall surface, which forms interior space of the insulating housing 11, with certain intervals therebetween in the connector longitudinal direction.

(35) Each of the electrically-conductive contact members 13 is used for signal transmission or for ground connection in a state in which the electrically-conductive contact member 13 is mounted on an electrically-conductive path formed on an illustration-omitted printed wiring board by solder joining.

(36) Meanwhile, the actuator 12 serving as the connection operating means is attached to the front edge part (left edge part in FIG. 5 and FIG. 6) of the insulating housing 11 as described above; wherein, as shown in FIG. 7, the actuator 12 is configured to be subjected to a turning operation so as to be lifted to an upper side. When the actuator 12 is subjected to the turning operation to the upper side in such a manner, the front edge part of the insulating housing 11 is caused to be in an open state across approximately the entire length thereof in the connector longitudinal direction (see FIG. 7). The terminal part of the plate-shaped signal transmission medium F composed of a flexible printed circuit (FPC), a flexible flat cable (FFC), or the like is inserted from the front edge part of the insulating housing 11 in the open state to the hollow-shape interior space of the insulating housing 11.

(37) Moreover, in a rear edge part (right edge part in FIG. 5 and FIG. 6) of the above described insulating housing 11, a plurality of part attachment openings 11b, 11b, and so on for attaching the electrically-conductive members 13, etc. to the interior of the insulating housing 11 are provided so as to be juxtaposed at certain intervals along the connector longitudinal direction. These part attachment openings 11b respectively correspond to rear-end openings of the above described contact attachment grooves 11a, and the electrically-conductive contact members 13 inserted in the insulating housing 11 through the part attachment openings 11b are inserted so as to slide along the contact attachment grooves 11a to predetermined positions and are fixed in the inserted state.

(38) As described above, the plurality of electrically-conductive contact members 13 are attached so as to form the multipolar shapes in the connector longitudinal direction, and the electrically-conductive contact members 13 are disposed at the positions corresponding to a wiring pattern (illustration omitted) of the plate-shaped signal transmission medium (for example, FPC or FFC) F inserted in the hollow interior space of the insulating housing 11 from the connector front side. The wiring pattern formed on the plate-shaped signal transmission medium F is a wiring pattern in which signal-transmitting electrically-conductive paths (signal-line pads) or shielding electrically-conductive paths (shield-line pads) are disposed at appropriate pitch intervals.

(39) [About Contact Members]

(40) Herein, each of the above described electrically-conductive contact members 13 has a rear-end base portion 13a fixed so as to be sandwiched by inner wall surfaces of upper and lower wall portions, which form the part attachment opening 11b of the insulating housing 11. At a lower end portion of the rear-end base portion 13a, a board connecting portion 13b extending so as to form a step shape toward an outer side of the connector rear side is continuously provided. The board connecting portion 13b is connected to the electrically-conductive path (illustration omitted) on the printed wiring board by solder joining, and the electric connector 1 is mounted by this solder joining.

(41) Furthermore, a supporting beam 13c is approximately horizontally extending toward the connector front side from an upper end part of the rear-end base portion 13a, which constitutes the above described electrically-conductive contact member 13. In a state in which the supporting beam 13c is abutting the inner surface of the upper wall portion forming the interior space of the insulating housing 11, the supporting beam 13c is extending to an approximately central part thereof in the connector front-rear direction. An extending end part of the supporting beam 13c is exposed to the upper side through a central opening 11c provided in the insulating housing 11.

(42) More specifically, the central opening 11c of the above described insulating housing 11 is formed so as to cut out part of the upper wall portion of the insulating housing 11 that is in the front side of the central part thereof in the connector front-rear direction, and the central opening 11c is provided across the entire length excluding lateral wall portions 11d and 11d provided at connector-longitudinal-direction both end portions. In a front-side region of the central opening 11c, the above described actuator (connection operating means) 12 is disposed; and, in a rear-side region of the central opening 11c, front-end-side parts of the supporting beams 13c constituting the electrically-conductive contact members 13 are disposed so as to be exposed to the upper side as described above.

(43) Moreover, in front end parts of the lateral wall portions 11d and 11d of the insulating housing 11, latched portions 11f having recessed shapes are formed. The actuator 12 is configured to be maintained in a horizontally pushed-down state as shown in FIG. 1 to FIG. 6 and FIG. 25 to FIG. 28 when later-described parts of the actuator 12 are latched with respect to the latched portions 11f. This point will be described later in detail.

(44) Herein, in a front end portion of the supporting beam 13c, a bearing portion 13d is formed so as to be opened toward the lower side and form a recessed shape. A turning shaft 12a serving as a shaft portion provided in the actuator (connection operating means) 12 is disposed so as to slidably contact, from the lower side, the bearing portion 13d provided in the supporting beam 13c, and the actuator 12 is configured to be turned about the turning shaft (shaft portion) 12a. The configuration of the actuator 12 will be described later in detail.

(45) Furthermore, at an integrally coupled part of the upper end part of the rear-end base portion 13a, which constitutes the rear end part of each of the electrically-conductive contact member 13, and a root part of the supporting beam 13c, an elastic beam 13e is provided so as to branch therefrom. The elastic beam 13e is formed by a band-shaped flexible member extending to form a cantilever shape from a lower edge of the root part of the above described supporting beam 13c toward the obliquely lower side in the connector front side, wherein the elastic beam 13e is extending to the obliquely lower side to a vicinity of the inner wall surface of the lower wall portion of the insulating housing 11 and is then approximately linearly extending toward the connector front side so as to be somewhat bent upward. At an extending-side front end part of the elastic beam 13e, a contact-point portion 13f is formed so as to form an upward projection shape.

(46) The contact-point portion 13f provided on the elastic beam 13e, which forms part of the electrically-conductive contact member 13, is in a disposition relation in which the contact-point portion 13f faces, from the lower side, the wiring pattern (illustration omitted) of the plate-shaped signal transmission medium (for example, FPC or FFC) F inserted in the insulating housing 11. The wiring pattern of the plate-shaped signal transmission medium F is configured to be pressed against, from the upper side, the contact-point portion 13f of the electrically-conductive contact member 13 when the plate-shaped signal transmission medium F is pressed toward the lower side by the actuator (connection operating means) 12 operated to be turned.

(47) [About Actuator]

(48) Herein, the actuator (connection operating means) 12, which is operated to be turned about the turning shaft (shaft portion) 12a in the above described manner, has an operation main-body portion 12b composed of a plate-shaped member extending in the connector longitudinal direction. The plate-shaped member constituting the operation main-body portion 12 is provided with a pair of edge portions extending approximately in parallel to the connector longitudinal direction, and the above described turning shaft 12a is extending so as to be along one of the edge portions.

(49) Longitudinal-direction both-side shaft-end parts of the turning shaft (shaft portion) 12a are formed in shaft-end supporting portions 12a1, which are projecting from connector-longitudinal-direction both end surfaces of the operation main-body portion 12b to the outer side. The both shaft-end supporting portions 12a1 and 12a1 are slidably supported from the lower side by upper edge portions of retaining metal fittings 14, which are disposed along the inner surface sides of the lateral wall portions 11d and 11d of the insulating housing 11, so as to support the turning shaft 12a so that the turning shaft 12a does not fall from the bearing portions 13d of the electrically-conductive contact members 13 to the lower side. The turning operation force of an operator is configured to be applied to an outer part of the turning radius about the turning shaft (shaft portion) 12a like this.

(50) Note that lower edge parts of the above described retaining metal fittings 14 are configured to be placed on the illustration-omitted printed wiring board and mounted thereon by solder joining.

(51) Furthermore, a front end part of the operation main-body portion 12b in the state in which the actuator (connection operating means) 12 is horizontally pushed down is provided with latch portions 12g, which are formed so as to form projecting shapes toward the outer side in the connector longitudinal direction. The latch portions 12g provided on the actuator 12 are configured to be mated with the latched portions 11f in the insulating housing 11 side when the actuator 12 is turned so as to be horizontally pushed down. When both of the members 12g and 11f are mated with each other, the actuator 12 is maintained in the horizontally pushed-down state (see FIG. 1 to FIG. 6 and FIG. 25 to FIG. 28).

(52) More specifically, in the horizontally pushed-down state, the actuator (connection operating means) 12 is disposed so as to close the front-side region of the central opening 11c of the above described insulating housing 11, and an opening turning operation of the actuator 12 is configured to be carried out from such acting position (closed position) at which the actuator 12 is horizontally pushed down by a closing turning operation of the actuator 12 to standby position (open position) at which the actuator 12 is lifted to the upper side as shown in FIG. 7 to FIG. 12. The actuator 12 subjected to the opening turning operation to the standby position (open position) abuts part of the insulating housing 11 and stops turning in a state in which the actuator 12 is pushed down somewhat to the rear side from an upright state.

(53) When the actuator (connection operating means) 12 is subjected to the opening turning operation in this manner so as to be lifted to the standby position (open position) (see FIG. 7 to FIG. 12), the front-end-side region of the insulating housing 11 is caused to be in a state open to the upper side so that the terminal part of the plate-shaped signal transmission medium (for example, FPC or FFC) F is placed from the upper side with respect to the front-end-side region of the insulating housing 11, which has been caused to be the open state.

(54) The terminal part of the plate-shaped signal transmission medium (for example, FPC or FFC) F placed in the front-end-side region of the insulating housing 11 is inserted toward the connector front side (right side in FIG. 17 to FIG. 28) and is stopped in a state in which the medium F is abutting the wall portion of the insulating housing 11. Herein, at both-side edge portions of the terminal part of the plate-shaped signal transmission medium F, illustration-omitted positioning latch plates are provided so as to bulge to both-side outer sides. When the both-side positioning latch plates abut lock plates 11e and 11e, which are disposed at longitudinal-direction both-side parts of the insulating housing 11 and mutually opposed, movement in the extending direction of the plate-shaped signal transmission medium F is restricted, thereby positioning the plate-shaped signal transmission medium F.

(55) Then, when the actuator (connection operating means) 12 which has been at the standby position (open position) is subjected to the closing turning operation so as to be pushed down to the connector front side and moved (turned) to the acting position (closed position) as shown in FIG. 25 to FIG. 28, the latch portions 12g, which are provided so as to form projecting shapes on the operation main-body portion 12b in the above described manner, are latched with the latched portions 11f of the insulating housing 11 and are retained at the acting position (closed position).

(56) As described later, medium pressing portions 12c are formed on the surface corresponding to the lower surface of the actuator (connection operating means) 12 which has been moved (turned) to the acting position (closed position). The medium pressing portions 12c are configured to press an upper surface (first surface) of the plate-shaped signal transmission medium (for example, FPC or FFC) F toward the lower side and press the wiring pattern, which is provided on the plate-shaped signal transmission medium F, against the contact-point portions 13f of the electrically-conductive contact members 13. This point will be described later in detail.

(57) Moreover, as shown particularly in FIG. 13 to FIG. 16, in the operation main-body portion 12b of the actuator (connection operating means) 12, a plurality of bearing housing portions 12d composed of spaces which house the bearing portions 13d of the supporting beams 13c, which are part of the above described electrically-conductive contact members 13, are provided in a recessed manner so as to form comb-teeth shapes. These bearing housing portions 12d are disposed at the same positions as the above described electrically-conductive contact members 13 in the connector longitudinal direction (the direction of the multipolar arrangement) and are disposed so that the bearing portions 13d of the supporting beams 13c are inserted in the bearing housing portions 12d of the actuator 12. The turning shaft 12a of the actuator (connection operating means) 12 is disposed to contact the bearing portions 13d of the supporting beams 13c so as to be pressed thereagainst from the lower side as described above so that the actuator 12 is configured to be turnably retained.

(58) On the other hand, as described above, on the operation main-body portion 12b of the actuator (connection operating means) 12, the plurality of medium pressing portions 12c, which press the upper surface (first surface) of the plate-shaped signal transmission medium (for example, FPC or FFC) F, are formed at the positions corresponding to the electrically-conductive contact members 13. The plurality of medium pressing portions 12c are formed on the surface corresponding to the lower surface of the actuator 12 which has been moved (turned) to the acting position (closed position), and the medium pressing portions 12c are formed by protruding linear portions disposed at predetermined pitch intervals in the connector longitudinal direction, which is the multipolar arrangement direction of the electrically-conductive contact members 13. Each of the protruding linear portions, which form the medium pressing portions 12c, is slenderly extending along the turning radius direction of the actuator 12 and is formed so that the transverse sectional shape thereof along the direction of the multipolar arrangement (connector longitudinal direction) forms an approximately rectangular shape.

(59) On the other hand, in the part between each pair of medium pressing portions 12c and 12c, which are provided so as to be adjacent to each other in the direction of multipolar arrangement (connector longitudinal direction), a groove portion 12e slenderly extending similarly along the turning radius direction of the actuator (connection operating means) 12 is provided in a recessed manner. Each of the groove portions 12e is formed so that the transverse sectional shape thereof along the direction of multipolar arrangement (connector longitudinal direction) forms an approximately rectangular shape and is configured to be in a state in which the groove portion 12e is not contacting the upper surface (first surface) of the plate-shaped signal transmission medium (for example, FPC or FFC) F in the state in which the actuator 12 is turned to the acting position (closed position), wherein a pressing action with respect to the plate-shaped signal transmission medium F is not carried out.

(60) In this manner, the medium pressing portions 12c provided on the actuator (connection operating means) 12 are disposed at the same positions as the electrically-conductive contact members 13 in the multipolar arrangement direction (connector longitudinal direction) of the electrically-conductive contact members 13. Therefore, when the actuator 12 disposed at the standby position (open position) so as to be flipped up to the upper side is subjected to a turning operation so as to be pushed down approximately horizontally toward the connector front side and is turned to the working position (closed position), the medium pressing portions 12c of the actuator 12 are in a disposition relation in which the medium pressing portions 12c face the electrically-conductive contact members 13 from immediately above.

(61) More specifically, when the actuator (connection operating means) 12 is subjected to the closing turning operation to the acting position (closed position) (see FIG. 25 to FIG. 28) in the state in which the terminal part of the plate-shaped signal transmission medium (for example, FPC or FFC) F is inserted in the insulating housing 11 (see FIG. 17 to FIG. 28), the medium pressing portions 12c of the actuator 12, which are formed by the slender protruding linear portions as described above, press the upper-side surface (first surface) of the plate-shaped signal transmission medium F toward the lower side. As a result, the wiring pattern provided in a lower surface (second surface) side of the plate-shaped signal transmission medium F is pressed in a pressurized contact state against the contact-point portions 13f of the electrically-conductive contact members 13.

(62) On the other hand, even in the state in which the actuator (connection operating means) 12 is turned to the acting position (closed position), the groove portions 12e each provided in the part between the pair of medium pressing portions 12c and 12c, which are adjacent to each other in the direction of multipolar arrangement (connector longitudinal direction), are maintained in the state in which the groove portions 12e are not in contact with the surface of the plate-shaped signal transmission medium (for example, FPC or FFC) F. As a result of providing the groove portions 12e like this, elastically deformed portions of the plate-shaped signal transmission medium F are housed in the space of the groove portions 12e, and the retaining force in the direction of multipolar arrangement with respect to the plate-shaped transmission medium F is improved.

(63) Furthermore, in part of each of the medium pressing portions 12c provided in the actuator (connection operating means) 12, a deformation allowing portion 12f is provided so as to communicate from the outer surface of the medium pressing portion 12c to the above described bearing housing portion 12d. The deformation allowing portion 12f is composed of a penetrating hole formed at a position somewhat in the rear side of the immediately-above position of the contact-point portion 13f of the electrically-conductive contact member 13 in the state in which the actuator (connection operating means) 12 is turned to the acting position (closed position). The elastically deformed portion of the plate-shaped signal transmission medium F in the case in which the medium pressing portion 12c of the actuator 12 presses the plate-shaped signal transmission medium (for example, FPC or FFC) F in the above described manner is configured to be housed in the inner-side space of the above described deformation allowing portion 12f.

(64) Herein, the operation main-body portion 12b of the above described actuator (connection operating means) 12 is provided with pre-pressing protruding portions 12h, which create a clicking sensation of the turning operation immediately before the plate-shaped signal transmission medium (for example, FPC or FFC) F is finally fixed. In the state in which the actuator 12 is raised to the standby position (open position) (see FIG. 7 to FIG. 12), the pre-pressing protruding portion 12h is formed so as to form a lower edge portion of the above described medium pressing portion (protruding linear portion) 12c and the groove portion 12e and is formed in a shape which is projecting toward a somewhat lower side of the turning shaft 12a at the front-side part of the turning shaft 12a.

(65) More specifically, the pre-pressing protruding portions 12h are provided so as to protrude to the inner side in the turning radius direction as described above; wherein, particularly as shown in FIG. 13, the pre-pressing protruding portion 12h is disposed in longitudinal-direction both-side regions of the actuator (connection operating means) 12 and are not provided in a longitudinal-direction central region. Therefore, in the longitudinal-direction central region of the actuator (connection operating means) 12, turning-radius-inner-side edge parts of the medium pressing portions (protruding linear portions) 12c and the groove portions 12e are formed so as to extend to form an approximately flat-surface shape.

(66) The pre-pressing protruding portions 12h are disposed in a front side (downstream side) of the medium pressing portions 12c in the direction of a circumferential trajectory of the closing turning operation that pushes down the actuator (connection operating means) 12, which has been at the standby position (open position), toward the acting position (closed position), and the distance (radius) thereto from the turning shaft 12a which is the turning center of the actuator 12 is set to be somewhat larger than the distance (radius) similarly from the turning shaft 12a to the medium pressing portion 12c.

(67) Therefore, when the actuator (connection operating means) 12 is subjected to the closing turning operation, top portions of the pre-pressing protruding portions 12h are brought into pressure-contact with the surface of the plate-shaped signal transmission medium F at the timing immediately before the medium pressing portions 12c are pressed against the surface of the plate-shaped signal transmission medium (for example, FPC or FFC) F. Immediately after that, the pre-pressing protruding portions 12h are detached from the surface of the plate-shaped signal transmission medium F, and the medium pressing portions 12c are brought into pressure-contact with the surface of the plate-shaped signal transmission medium F. Therefore, a so-called clicking sensation and clicking sound are configured to be obtained in the closing turning operation.

(68) The pre-pressing protruding portions 12h provided in this manner in downstream-side vicinity parts of the medium pressing portions 12c in the closing-turning-operation direction of the actuator (connection operating means) 12 are provided in partial regions in the connector longitudinal direction, which is the multipolar arrangement direction of the electrically-conductive members 13. However, they are not limited to the configuration in which the pre-pressing protruding portions 12h are disposed only in the longitudinal-direction both-side regions of the actuator 12 like the present embodiment, and various disposition relations can be employed, for example, a disposition configuration in which the pre-pressing protruding portions 12h are scattered in the longitudinal direction of the actuator 12 at intervals determined in advance.

(69) As described above, according to the electric connector 10 according to the present embodiment, the pressing force of the pre-pressing protruding portions 12h with respect to the plate-shaped signal transmission medium (for example, FPC or FFC) F is applied only partially in the longitudinal direction of the actuator 12. Therefore, even if the actuator 12 is enlarged in the multipolar arrangement direction of the electrically-conductive contact members 13 along with increase of the number of signal transmission electrodes, the pressing force of the pre-pressing protruding portions 12h with respect to the plate-shaped signal transmission medium F is not largely increased. Therefore, while the operating force to the actuator 12 in a stage before the plate-shaped signal transmission medium F is finally fixed is reduced, the pressing force of the medium pressing portions 12c is maintained without being reduced. Therefore, the final fixation state of the plate-shaped signal transmission medium F is obtained well.

(70) Moreover, in the present embodiment, when the actuator (connection operating means) 12 is turned to the acting position (closed position), the medium pressing portions 12c of the actuator 12 at the position directly opposed to the contact-point portions 13f of the electrically-conductive contact members 13 press the plate-shaped signal transmission medium (for example, FPC or FFC) F. Therefore, the contact pressures applied from the medium pressing portions 12c of the actuator 12 to the plate-shaped signal transmission medium F are reliably applied to the contact-point portions 13f of the electrically-conductive contact members 13 without being dispersed.

(71) Furthermore, in the present embodiment, the groove portions 12e are formed in the parts between the medium pressing portions 12c of the actuator (connection operating means) 12. Therefore, only the medium pressing portions 12c of the actuator 12 are brought into pressure-contact with the upper surface (first surface) of the plate-shaped signal transmission medium (for example, FPC or FFC) F, and the contact pressures of the contact-point portions 13f of the electrically-conductive contact members 13 opposed to the medium pressing portions 12c of the actuator 12 are more reliably applied to the plate-shaped signal transmission medium F.

(72) Furthermore, in the present embodiment, the elastically deformed portions of the plate-shaped signal transmission medium (for example, FPC or FFC) F generated by pressing by the medium pressing portions 12c of the actuator (connection operating means) 12 are housed in the deformation allowing portions 12f provided in the actuator 12, and, as a result, the plate-shaped signal transmission medium F is caused to be in a latched state. Therefore, the retainability of the plate-shaped signal transmission medium F is improved.

(73) In addition, in the present embodiment, part of the electrically-conductive contact member 13 including the bearing portion 13d is structured to be housed in the bearing housing portion 12e provided in the actuator (connection operating means) 12. Therefore, the entire electric connector can be downsized.

(74) Moreover, the bearing housing portion 12d provided in the actuator (connection operating means) 12 in the present embodiment is communicated with the deformation allowing portion 12f. Therefore, in mold forming of the actuator 12, the structure of a mold for forming the bearing housing portion 12d and the turning shaft 12a is easily released through the part corresponding to the deformation allowing portion 12f, and productivity is improved.

(75) Hereinabove, the invention accomplished by the present inventor has been described in detail based on the embodiment. However, the present invention is not limited to the above described embodiment, and it goes without saying that various modifications can be made within the range not departing from the gist thereof.

(76) For example, in the above described embodiment, the flexible printed circuit (FPC) and the flexible flat cable (FFC) are employed as the plate-shaped signal transmission medium to be fixed to the electric connector. However, the present invention can be similarly applied also to the cases in which other signal transmission media, etc. are used.

(77) Moreover, the actuator according to the above described embodiment is configured to be turned toward the connector front side. However, the present invention can be similarly applied also to an electric connector in which it is configured to be turned toward the connector rear side.

(78) Furthermore, the electric connector according to the above described embodiment employs the configuration in which the electrically-conductive contact members having the same shapes are arranged in multipolar shapes. However, the present invention can be similarly applied also to the configuration using electrically-conductive contact members having different shapes.

(79) The present invention can be widely applied to various electric connectors used in various electric devices.