ANTI-VIBRATION MECHANISM FOR CAMERA DEVICE, OPTICAL SYSTEM, CAMERA AND ELECTRONIC DEVICE

Abstract

In a camera device that includes a hand tremor correction mechanism, an anti-vibration mechanism for the camera device is provided. An optical system that is movable in an optical axis direction and includes a focus adjustment mechanism is provided in the camera device, includes an anti-vibration mechanism that performs hand tremor correction by anti-vibration of the imaging element, and includes from an object side, an imaging lens group, the anti-vibration mechanism, and an imaging element provided on the anti-vibration mechanism, and a substantial principal point of a lens is used as a center to allow the imaging element on the anti-vibration mechanism to rotate relative to an optical axis of the imaging lens group, so as to achieve hand tremor correction.

Claims

1. An anti-vibration mechanism for a camera device, the camera device comprising an optical system that is movable in an optical axis direction and comprises a focus adjustment mechanism, an imaging element, and an imaging lens group, wherein the anti-vibration mechanism is provided in the optical system and configured to correct hand tremor by rotating the imaging element about two axes that pass through a substantial principal point of a lens and are perpendicular to each other in a plane perpendicular to the optical axis direction, wherein the anti-vibration mechanism containing the imaging element is closer to an image side than the imaging lens group, and is rotatable about the substantial principal point of the lens relative to the optical axis direction; wherein the anti-vibration mechanism comprises: a frame assembly comprising a movable frame configured to rotate about the two axes that pass through the substantial principal point of the lens and are perpendicular to each other in the plane perpendicular to the optical axis direction; a ball member configured to hold the imaging element in the frame assembly to enable the imaging element to smoothly rotate in the frame assembly; a driving member configured to drive the imaging element to rotate, the driving member being an electric actuator; an integrated circuit configured to drive the electric actuator; a detection element configured to detect a position when driving; a flexible substrate configured to transmit a signal of the imaging element; and a circuit configured to supply power to a device configured to drive the lens.

2. The anti-vibration mechanism for the camera device as described in claim 1, wherein the electric actuator comprises an anti-vibration coil, and the anti-vibration coil is clamped between two anti-vibration magnets.

3. The anti-vibration mechanism for the camera device as described in claim 2, wherein the movable frame is provided with a groove for holding the ball member.

4. The anti-vibration mechanism for the camera device as described in claim 1, wherein an upper position of the anti-vibration mechanism is provided with a circuit for supplying a signal line for position detection of the device configured to drive the lens.

5. The anti-vibration mechanism for the camera device as described in claim 1, wherein the frame assembly further comprises a support frame, a magnetic yoke is provided on the movable frame, and the electric actuator exerts a force in a direction in which the anti-vibration magnet and the magnet yoke attract each other.

6. The anti-vibration mechanism for the camera device as described in claim 5, further comprising a base on which the imaging element is placed, wherein the base is a plate made of metal, the support frame is made of resin, and the base and the support frame are formed into one piece.

7. The anti-vibration mechanism for the camera device as described in claim 1, where a flexible substrate is configured to supply power to the electric actuator, and the flexible substrate is bent at least twice in the optical axis direction at a back side of the imaging element, corresponding to axes about which the moveable frame for holding the imaging element rotates.

8. The anti-vibration mechanism for the camera device as described in claim 1, where a flexible substrate is configured to supply power to the electric actuator, and the flexible substrate is bent at least twice at a position closer to an outside than the electric actuator, corresponding to the axes about which the moveable frame for holding the imaging element rotates, and which pass through the substantial principal point of the lens and are perpendicular to each other in the plane perpendicular to the optical axis direction.

9. An optical system, comprising the anti-vibration mechanism as described claim 1.

10. The optical system as described in claim 9, further comprising a focus adjustment mechanism, wherein the focus adjustment mechanism has a movement hand tremor correction mechanism capable of moving the lens.

11. The optical system as described in claim 10, wherein the focus adjustment mechanism has a zoom mechanism capable of multi-stage retracting the lens for storage.

12. A camera, comprising the optical system as described in claim 9.

13. A portable electronic device, comprising the camera as described in claim 12.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a perspective view of a structure of a flexible substrate in an anti-vibration mechanism for a camera device according to an embodiment of the present invention, the flexible substrate passing through a lower side of an imaging element, when observed from a front side.

[0031] FIG. 2 is a perspective view of a structure of a flexible substrate in an anti-vibration mechanism for a camera device according to an embodiment of the present invention, the flexible substrate passing through a side surface of the anti-vibration mechanism, when observed from a front side.

[0032] FIG. 3 is a cross-sectional view of a structure of a flexible substrate in an anti-vibration mechanism for a camera device according to an embodiment of the present invention, the flexible substrate passing through a lower side of an imaging element.

[0033] FIG. 4 is a cross-sectional view taken along A-A line of a structure of a flexible substrate in an anti-vibration mechanism for a camera device according to an embodiment of the present invention, the flexible substrate passing through a side surface of the anti-vibration mechanism.

[0034] FIG. 5 is a schematic diagram of a flexible substrate according to an embodiment of the present invention when observed from an angle.

[0035] FIG. 6 is a schematic diagram of the flexible substrate shown in FIG. 5 when observed from another angle.

[0036] FIG. 7 is a schematic diagram of a flexible substrate according to another embodiment of the present invention when observed from an angle.

[0037] FIG. 8 is a schematic diagram of the flexible substrate shown in FIG. 7 when observed from another angle.

[0038] FIG. 9 illustrates an autofocus mechanism having a focus adjustment mechanism according to an embodiment of the present invention.

[0039] FIG. 10 is a side view of FIG. 9.

[0040] FIG. 11 illustrates a telescopic zoom mechanism having a focus adjustment mechanism according to an embodiment of the present invention.

[0041] FIG. 12 is a side view of FIG. 11.

[0042] FIG. 13 illustrates a portable electronic device (portable information terminal) equipped with an anti-vibration mechanism for a camera device of the present invention.

REFERENCE SIGNS

[0043] 10-a: base A

[0044] 10-b: base B

[0045] 10-c: support member groove of the base

[0046] 11-a: case A

[0047] 11-b: case B

[0048] 12-a: support frame

[0049] 12-b: support member groove of the support frame

[0050] 12-c: support member groove of the support frame

[0051] 13-a: movable frame

[0052] 13-b: support member groove of the movable frame

[0053] 14: imaging element support frame

[0054] 15: ball

[0055] 20: cover plate

[0056] 30: lens

[0057] 30-a: entrance surface of the lens

[0058] 30-b: exit surface of the lens

[0059] 31: autofocus mechanism having a focus adjustment mechanism

[0060] 32: telescopic zoom mechanism having a focus adjustment mechanism

[0061] 40: imaging element

[0062] 50: flexible substrate A

[0063] 51: flexible substrate B

[0064] 52: folded portion of the flexible substrate A

[0065] 53: folded portion of the flexible substrate B

[0066] 60: anti-vibration unit

[0067] 70: anti-vibration coil

[0068] 71: anti-vibration Hall sensor

[0069] 72: anti-vibration magnetic yoke

[0070] 74: anti-vibration magnet A

[0071] 75: anti-vibration magnet B

[0072] 100: anti-vibration mechanism for a camera device

[0073] 200: portable information equipment

DESCRIPTION OF EMBODIMENTS

[0074] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0075] FIG. 1 to FIG. 4 are diagrams showing an anti-vibration mechanism 100 for a camera device and an anti-vibration unit 60 according to the present invention.

[0076] FIG. 1 to FIG. 12 illustrate a camera device and constituting elements thereof according to embodiments of the present invention.

[0077] The imaging optical system of the anti-vibration mechanism 100 for the camera device is an optical system including, from an object side: a lens 30; an autofocus mechanism 31 configured to drive the lens 30 and having a focus adjustment mechanism, or a telescopic zoom mechanism 32 configured to drive the lens 30 and including a focus adjustment mechanism; and an imaging element 40.

[0078] A light beam that comes from an object to be imaged and travels along the optical axis is incident onto an entrance surface 30-a of the lens and then emitted from an exit surface 30-b of the lens to form an image on an imaging surface of the imaging element 40.

[0079] The anti-vibration mechanism 100 for the camera device further includes a base A10-a, and the base A10-a may be a plate made of metal. As shown in FIG. 1, in a space formed by the base A10-a and a case A11-a having a space of an anti-vibration unit 60, an anti-vibration magnet B75 fixed to the base 10-a and an anti-vibration magnet A74 fixed to the case A11-a are provided.

[0080] The anti-vibration mechanism 100 for the camera device further includes a ball member for holding the imaging element 40 in a frame assembly to enable the imaging element 40 to smoothly rotate in a frame assembly. A driving member for driving the imaging element 40 to rotate is an electric actuator. The electric actuator may be an anti-vibration coil 70.

[0081] An electric actuator member for movement (i.e., the anti-vibration coil 70), an imaging element support frame 14, and an anti-vibration magnetic yoke 72 are provided on a support frame 12-a that supports a ball 15 on the base A10-a and on a movable frame 13-a that can support the ball 15 on the support frame 12-a. The imaging element support frame 14 is installed with the imaging element 40 and a flexible substrate A50 that is used for delivering a signal line and a power line to the imaging element 40 and the electric actuator, in order to exchange external signals and power.

[0082] The support frame 12-a may be made of resin, and the base A10-a and the support frame 12-a may be formed into one piece.

[0083] In addition, an anti-vibration Hall sensor 71 is mounted onto the flexible substrate A50 and is configured to read a magnetic force of the anti-vibration magnet B75 and provide feedback.

[0084] A bottom surface of the base A10-a has an aperture for allowing the flexible substrate A50 to communicate with the outside, and the aperture is closed by a cover plate 20.

[0085] The anti-vibration coil 70 on the movable frame 13-a described above is configured to be clamped by the anti-vibration magnet B75 fixed to base 10-a and the anti-vibration magnet A74 fixed to the case All-a, and an electromagnetic force generated by the anti-vibration coil 70 when energized effectively acts on the anti-vibration magnet A74 and the anti-vibration magnet B75.

[0086] The imaging element support frame 14, the anti-vibration coil 70, the anti-vibration Hall sensor 71, and the anti-vibration magnetic yoke 72 mounted on the movable frame 13-a, and the flexible substrate A or the flexible substrate B are driven by interaction of an electromagnetic force generated by the anti-vibration coil 70 when energized with the anti-vibration magnet A74 and the anti-vibration magnet B75, so as to prevent vibration.

[0087] The anti-vibration magnetic yoke 72 is arranged and fixed to a side of the movable frame 13-a that does not face the anti-vibration magnet B75.

[0088] The above-mentioned base A10-a and base B10-b have support member grooves 10-c that are configured to hold the ball 15 for sliding with the support frame 12-a. In addition, an opposing part of the support frame 12-a also has a support member groove 12-b of the support frame. Further, an opposing part of the support frame 12-a that faces the movable frame 13-a has support member grooves 12-c of the support frame, and the movable frame 13-a also has a support member groove 13-b of the movable frame. These support member grooves have such a surface accuracy that allows the ball 15 to rotate smoothly.

[0089] Regarding the support member groove 10-c of the base, the support member groove 12-b of the support frame 12-a, the support member groove 12-c of the support frame 12-a, and the support member groove 13-b of the movable frame, since each of these grooves is a groove corresponding to a moving direction, the grooves also have an effect of limiting the movement direction and preventing rotating in a direction other than the desired movement direction.

[0090] With the support of the support member groove 10-c of the base, the support member groove 12-b of the support frame, the support member groove 12-c of the support frame, and the support member groove 13-b of the movable frame, and the use of a ball 15 by the sliding part, it enables sliding with a low load, and upon pressurization, the vibration can be reliably removed.

[0091] The direction in which the above-mentioned vibration is removed is a direction from the anti-vibration magnetic yoke 72 mounted to the movable frame 13-a towards the anti-vibration magnet B75 mounted to the base A10-a, and is consistent with a direction determining a distance of the movable frame 13-a from the base A10-a and the support frame 12-a, enabling stable position detection. The anti-vibration magnetic yoke 72, which is opposed to the anti-vibration magnet B75 mounted to the base A10-a, is thinner than the anti-vibration magnet B75, and is configured to generate an attractive force for center holding the movable frame 13-a. That is, when the movable frame 13-a moves, the anti-vibration magnetic yoke 72 functions as a magnetic spring that uses magnetism to hold the movable frame 13-a at a predetermined position (i.e., a center of a movement range in an embodiment).

[0092] As described above, the support frame 12-a is movably held on the base A10-a by using the ball 15, and the movable frame 13-a is movably held on the support frame 12-a by using the ball 15.

[0093] In addition, the anti-vibration magnetic yoke 72 provided on the movable frame 13-a applies a force in a direction towards the anti-vibration magnet B75 provided on the base Al 0-a or the base B10-b. The anti-vibration magnetic yoke 72 performs center holding of the moving direction, and has functions of preventing falling off of the support frame 12-a and removing vibration between blocks while having a function of effectively using leakage magnetic flux of the anti-vibration coil 70 for the driving force, thereby reducing the parts greatly.

[0094] By providing the anti-vibration Hall sensor 71, it allows to detect magnetism of the anti-vibration magnet B75 mounted to the base A10-a, and to detect positions of the movable frame 13-a and the support frame 12-a. Therefore, it is possible to perform vibration correction adjustment with higher precision, so as to achieve accurate control.

[0095] The anti-vibration coil 70 may be a coil winding mounted and fixed to the imaging element support frame 14 and the movable frame 13, or an electric-c onductive pattern directly formed on the flexible substrate A50.

[0096] The flexible substrate A50 of the anti-vibration device 100 for the imaging element is arranged to be bent towards a lower side of the imaging element 40, so that a counter-a cting force of the flexible substrate A50 can be reduced by freely driving in driving directions of two axes. Therefore, it can be folded at least once in the two axes. Signal lines and power lines are arranged outside the new mechanism 100 required by the camera device, so as to form a folded portion 52 of the flexible substrate A.

[0097] In order to delivery all signal lines and power lines of the anti-vibration mechanism 100 for the imaging element and the imaging element 40, the above-mentioned flexible substrate A50 further includes signal lines and power lines guided to the autofocus mechanism 31 that hold the lens 30 and has the focus adjustment mechanism and other devices related to the lens 30.

[0098] The flexible substrate A50, like the flexible substrate B51, can be arranged at a side surface of the anti-vibration mechanism for the imaging element. In this case, a folded portion 53 of the flexible substrate B can be formed. In this case, a member having a space for receiving the flexible substrate B51 (like the base B10-b and the case B11-b) can be formed.

[0099] In this case, all the signal lines and power lines described above are still included.

[0100] In an embodiment, the device for driving the lens may be a telescopic zoom mechanism 32 having a focus adjustment mechanism or a tilt hand tremor correction mechanism (not shown) that achieves anti-vibration by tilting the lens.

[0101] The anti-vibration mechanism 100 for the camera device can be used for, for example, a camera device for a portable information device 200 such as a smart phone, a feature phone, and a tablet device shown in FIG. 13.

[0102] The above description are merely representative embodiments of the present invention, and a protection scope of the present invention is not limited to the above-described embodiments. Equivalent corrections or modifications made by those skilled in the art based on the disclosure of the present invention are all included in the scope claimed by the claims of the present invention.