PURE WIRELESS EARPHONES USING OPTIMAL MONOPOLE ANTENNAE

Abstract

The present invention relates to a pair of pure wireless earphones using optimal monopole antennae in the technical field of communications, comprising in-ear type earphone housings and RF signal generation devices disposed in the in-ear type earphone housings, wherein positioning stages matched with the shape of auricular concha cavities are at the tops of bottom housings; each RF signal generation device consists of an antenna, a main PCB and a battery; each antenna is used for establishing an RF communication link with an audio source and a secondary earpiece; and a ball is drawn with each antenna as a center point and the outer wall of the corresponding in-ear type earphone housing closest to the antenna as a radius to form a space as an antenna holding area in which the antenna is located, and the radius of the ball is greater than 4 mm. When a distance between each antenna and the skin or tissues of a human body is greater than 4 mm, an optimal coupling can be formed therebetween to possibly create an optimal RF creeping wave communication link, the antenna gain and efficiency attenuation of an in-ear type Bluetooth device is within an acceptable range, and the antenna can also maintain a proper RF communication link between a primary earpiece and a mobile phone.

Claims

1. A pair of pure wireless earphones using optimal monopole antennae, comprising in-ear type earphone housings and RF signal generation devices disposed in the in-ear type earphone housings, the in-ear type earphone housings being formed by buckling top housings and bottom housings in pairs and being internally provided with accommodating cavities, the bottoms of the bottom housings extending downwards and being sound outlets communicated with the accommodating cavities, the bottom housings being internally provided with loudspeakers communicated with the sound outlets and being sleeved with ear pads for plugging external acoustic foramina at the bottoms, characterized in that positioning stages matched with the shape of auricular concha cavities are at the tops of the bottom housings; the outer bottom faces of the positioning stages fit the surfaces of the auricular concha cavities in pairs; the outer walls of the positioning stages are in contact with tragi; the RF signal generation devices are located in the accommodating cavities; each RF signal generation device consists of an antenna, a main PCB and a battery; each main PCB comprises a Bluetooth chipset; each antenna is used for establishing RF communication links with an audio source and a secondary earpiece; each battery, each antenna and each loudspeaker are electrically connected with the corresponding main PCB; and a ball is drawn with each antenna as a center point and the outer wall of the corresponding in-ear type earphone housing closest to the antenna as a radius to form a space as an antenna holding area in which the antenna is located, and the radius of the ball is greater than 4 mm.

2. The pair of pure wireless earphones using the optimal monopole antennae according to claim 1, characterized in that the main PCBs are provided with vertically disposed metal grounding layers, which evenly surround the edges of the main PCBs and are used for ensuring the even distribution of radio-frequency radiation currents.

3. The pair of pure wireless earphones using the optimal monopole antennae according to claim 2, characterized in that the metal grounding layers are made of a copper foil material.

4. The pair of pure wireless earphones using the optimal monopole antennae according to claim 2, characterized in that the batteries are disposed at the bottom faces of the main PCBs, the metal grounding layers surround the batteries, and the edges of the main PCBs are provided with USB end plates for charging the batteries.

5. The pair of pure wireless earphones using the optimal monopole antennae according to claim 1, characterized in that the antennae are short monopole antennae.

6. The pair of pure wireless earphones using the optimal monopole antennae according to claim 5, characterized in that the short monopole antennae are short spiral monopole antennae.

7. The pair of pure wireless earphones using the optimal monopole antennae according to claim 5, characterized in that the short monopole antennae are balanced type antennae.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0029] FIG. 1 is an exploded schematic diagram of a structure according to an embodiment of the present invention;

[0030] FIG. 2 is a sectional view of an embodiment of the present invention;

[0031] FIG. 3 is a schematic diagram of a stereoscopic structure of an RF signal generation device in an embodiment of the present invention;

[0032] FIG. 4 is a basic concept diagram of RF creeping waves in an embodiment of the present invention;

[0033] FIG. 5 is a diagram showing the working principle of 3D antenna radiation in an embodiment of the present invention;

[0034] FIG. 6 is an “X-Z” plane 2D curve diagram of analog and actual antenna radiation patterns in an embodiment of the present invention;

[0035] In FIG. 3, bidirectional arrows refer to mounting and connection directions of respective parts and components, and in FIG. 6, a dash line refers to an analog radiation pattern and a solid line refers to an actually measured radiation pattern; and

[0036] In FIG. 1 to FIG. 5, reference signs are as follows: 1. bottom housing, 2. top housing, 3. sound outlet, 4. positioning stage, 5. antenna, 6. main PCB, 7. loudspeaker, 8. battery, 9. ear pad, 10. USB end plate, 11. metal grounding layer, 12, human head, 13. RF creeping wave, and 14. RF communication link.

DETAILED DESCRIPTION OF THE INVENTION

[0037] The present invention will be further described in details below in combination with the accompanying drawings and particular embodiments.

[0038] In the present embodiment, with reference to FIG. 1 to FIG. 6, a pair of pure wireless earphones using optimal monopole antennae according to specific implementation comprises in-ear type earphone housings and RF signal generation devices disposed in the in-ear type earphone housings, and as shown in FIG. 1 and FIG. 3, the in-ear type earphone housings are formed by buckling top housings 2 and bottom housings 1 in pair. The in-ear type earphone housings are internally provided with accommodating cavities, the bottoms of the bottom housings 1 extend downwards and are sound outlets 3 communicated with the accommodating cavities, the bottom housings 1 are internally provided with loudspeakers 7 communicated with the sound outlets 3 and sleeved with ear pads 9 for plugging external acoustic foramina, at bottoms.

[0039] Positioning stages 4 matched with the shape of auricular concha cavities are at the tops of the bottom housings 1; the outer bottom faces of the positioning stages 4 fit the surfaces of the auricular concha cavities in pairs; the outer walls of the positioning stages 4 are in contact with the tragi; the RF signal generation devices are located in the accommodating cavities; each RF signal generation device consists of an antenna 5, a main PCB 6 and a battery 8; the antennae 5 in the present embodiment are short spiral monopole antennae; each main PCB 6 comprises a Bluetooth chipset, and each main PCB 6 in the present embodiment is horizontally disposed in the corresponding accommodating cavity; the antennae 5 are used for establishing RF communication links 14 with an audio source and an antenna 5 of a secondary earpiece; the batteries 8, the antennae 5 and the loudspeakers 7 are electrically connected with the main PCBs 6.

[0040] A ball is drawn with each antenna 5 as a center point and the outer wall of the corresponding in-ear type earphone housing closest to the antenna 5 as a radius to form a space as an area for holding the antenna 5 which is placed in the area for holding the antenna 5, and the radius of the ball is greater than 4 mm; since the in-ear type earphone housings are closely pressed to the auricular concha cavities and the tragi of the human body, the radius of the ball is a distance between the antenna 5 and the skin or tissue of a human body; when the radius of the ball is greater than 4 mm, that is to say the distance between the antenna 5 and the skin or tissue of the human body is greater than 4 mm, and if the spacing between the antenna 5 and the skin or tissue of the human body is greater than 4 mm, it is suitable for enabling the coupling between RF as well as RF creeping waves 13 and the human skin.

[0041] As shown in FIG. 3, the main PCBs 6 are provided with vertically disposed metal grounding layers 11, which evenly surround the edges of the main PCBs 6 and are used for ensuring the event distribution of the radio-frequency radiation currents; the metal grounding layers are formed by welding copper foil materials; the batteries 8 are disposed on the bottom faces of the main PCBs 6; the metal grounding layers 11 surround the respective batteries 8; and the edges of the main PCBs 6 are provided with USB end plates 10 for charging the batteries 8.

[0042] When the radius of the ball is equal to 4 mm, that is to say the distance between the antenna 5 and the skin or tissue of the human body is equal to 4 mm, the top of the antenna 5 is the optimal antenna feedback point, and all design criteria are met thereby to possibly ensure the implementation of the generation of the optimal RF creeping waves 13 and the establishment of a secure RF link with the audio source (such as a smart phone); when a distance between the antenna 5 and the skin or tissue of the human body is greater than 4 mm, the gain and efficiency attenuation of the antennae 5 of an in-ear type Bluetooth device are within an acceptable range under this spacing condition, and the antennae 5 can also maintain a proper RF communication link 14 between a master earpiece and a mobile phone; when a spacing between the antenna 5 and the human skin is 4 mm, an optimal coupling can be formed with the human skin, and the communication link of the optimal RF creeping wave 13 can be created between the left and right earphone devices; and the auricles and the auricular concha cavities are unique recess areas allowing the placement of the in-ear type earphones, and meanwhile, as the thinnest human tissues near the earholes and back faces of the ears of a human, the auricles and the auricular concha cavities allow the RF waves to penetrate through the auricles and generate the RF creeping waves 13 on the back faces of the ears.

[0043] As shown in FIG. 4, the shortest communication distance between a “left ear” and a “right ear” is between the back faces of the auricles, and it is an optimal option to generate the RF creeping waves 13 between the back faces of the auricles of a human head 12; RF signals may penetrate through the thinnest auricle areas near the earholes and auricular concha cavities of a human skull; and as the thinnest human tissues near the earholes and back faces of the ears of the human body, these areas allow the RF waves to penetrate through the auricles and couple to the skin near the back faces of auricles at the optimal positions behind the ears at which the RF creeping waves 13 are generated.

[0044] As shown in FIG. 5, it shows how the EM waves radiate, how the EM waves penetrate through the auricles of the human head 12 to be coupled with the human skin at the back faces of the auricles, and how the EM waves form the RF communication link 14 between the left and right earpieces.

[0045] As shown in FIG. 6, the results from the analog and actual radiation patterns show that the two radiation patterns are almost fitted, meanwhile, this also proves that the design goal of transceiving the RF waves between the “mater-slave” earpieces and the audio sources can be achieved.

[0046] The above is the further detailed illustration made for the present invention in combination with particular preferred embodiments, and cannot be deemed as the particular implementation of the present invention is limited to these illustrations. For those of ordinary skills in the art to which the present invention pertains, a plurality of simple deduction or substitutions, which can also be made without departing from the concept of the present invention, are construed to fall within the protection scope of the present invention.