Patent Publication Number: US-10313784-B2

Title: Integrally-designed bone conduction driver

Description:
BACKGROUND 
     Technical Field 
     The present invention relates to the technical field of headsets using bond conduction speaker technologies. 
     Related Art 
     Bone conduction is a sound conduction manner. That is, sound is converted to mechanical vibrations at different frequencies, and sound waves are transmitted through the skull, the bony labyrinths, the inner ear lymph, the spiral organs, the auditory nerves, and the auditory center. Currently, bone conduction speakers usually conduct sound directly by using facial cheekbones. Compared with a classic sound conduction manner in which sound waves are generated by using a vibrating diaphragm, in the bone conduction manner, multiple steps for transmitting sound waves are omitted, clear sound can be reconstructed in a noisy environment, and the sound waves are prevented from affecting other persons for being diffused in the air. Moreover, both ears may also be released, and the eardrums are not harmed. 
     However, existing bone conduction speakers have technical disadvantages including: complex processes, relatively large volumes, relatively large thicknesses, heaviness, and poor comfortability when they are worn. 
     SUMMARY 
     Based on the above, an objective of the present invention is to provide an integrally-designed bone conduction driver, to overcome technical disadvantages of existing bone conduction speakers, namely, complex processes and poor comfortability when they are worn. 
     To resolve technical problems raised in the present invention, the following technical solution is used: 
     An integrally-designed bone conduction driver includes a vibrating plate, a voice coil, an elastic piece, a magnet, a washer, and a cup holder, where 
     the voice coil includes a tubular framework and a coil and a lead wire that are coiled on the framework, and a wire outlet end of the voice coil is fixed on an inner side face of the vibrating plate; 
     the vibrating plate is connected to the cup holder by using the elastic piece as an elastic support, the elastic piece includes an inner ring part, at least two outer arc parts that are concentric with and in clearance fit with the inner ring part, and at least two connection parts connecting tail ends of the outer arc parts to the inner ring part, and front ends of the outer arc parts and the inner ring part are respectively connected to the vibrating plate and the cup holder; and 
     the magnet is fixed at an internal central position of the cup holder, the washer is fixed on the magnet in a gluing manner, the washer is coaxial with the magnet, and the washer is disposed in an inner cavity of the voice coil and in uniform clearance fit with the voice coil. 
     The vibrating plate includes a plate body having a diameter the same as that of the brim of the cup holder, a side of the plate body being provided with at least two fixed feet that are each fixedly connected to the front end of each outer arc part; and the inner ring part is attached to and fixedly connected to the brim of the cup holder, and the cup holder is a component of a magnetic circuit. 
     Holder supporting blocks correspondingly supporting the connection parts are disposed on an outer sidewall of the cup holder. 
     The cup holder is a tripod cup holder. 
     Beneficial effects of the present invention are as follows: 
     (1) In the present invention, a voice coil is integrally combined with an inner side face of a vibrating plate, and the vibrating plate is connected to a cup holder by using a particular elastic supporting structure, so that the process is simple and easy, the combination is simple, and an additional elastic piece and an additional support that support each other and fix the voice coil are not needed. The process is simple and easy, there are fewer parts, and the combination is simple. 
     (2) The entire thickness of a bone conduction drive head is greatly reduced, so that not only the weight is reduced, but also the sensitivity and the kinetic energy are increased, and the shape is special and aesthetic. 
     (3) A conventional bone conduction driver is a voice coil without a framework, the assembly is complex, losses are easily caused, the bearing power is not high, and the service life is short. With regard to a voice coil with a framework provided in the present invention, not only a process is simplified, but also features, such as fatigue resistance and high-temperature resistance, of the voice coil are enhanced, so that the service life of the bone conduction driver is greatly prolonged. 
     (4) The elastic piece in the present invention is not a conventional elastic piece, and a central position of the elastic piece needs to be used to fix the voice coil or a special support, breaking the conventional fixation manner. The elastic piece is a sided-arc independent single sheet. The arc sheet is either fixed or moveable in a vertical direction, the elasticity is excellent, and the sequence is good. 
     (5) A conventional assembly manner in which the voice coil is fixed to a support is broken, the support is omitted, and the voice coil is directly mounted onto the vibrating plate. The assembly is simple and easy, and parts are combined precisely and stably. 
     (6) The cup holder is designed as a special tripod instead of a conventional cylinder, a support of the cup holder that is used to fix the elastic piece is removed, and a tripod of the cup holder and a round edge mesa are used to fix the elastic piece. With reference to (5), not only the entire weight of a product is reduced, but also the thickness of bone conduction is reduced, so that the product is more competitive in terms of design of a spatial structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram  1  of a three-dimensional structure according to the present invention; 
         FIG. 2  is a schematic diagram  2  of a three-dimensional structure according to the present invention; 
         FIG. 3  is a schematic diagram of a top-view structure according to the present invention; 
         FIG. 4  is a schematic diagram of a bottom-view structure according to the present invention; 
         FIG. 5  is a schematic diagram of a cross-section structure according to the present invention; and 
         FIG. 6  is a schematic diagram of a three-dimensional structure according to the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     A structure of the present invention is further described with reference to the accompanying drawings and specific preferred embodiments of the present invention. 
     Referring to  FIG. 1  to  FIG. 6 , a bone conduction speaker in the present invention includes a vibrating plate  1 , a voice coil  2 , an elastic piece  5 , a magnet  3 , a washer  6 , and a cup holder  4 . 
     The voice coil  2  includes a tubular framework that is made of KSV and a coil and a lead wire that are coiled on the framework, to form a polyimide film oxygen-free copper high-temperature resistant voice coil having a good tone. One end of the framework is integrally combined with an inner side face of the vibrating plate  1 , and the combination is simple. 
     The vibrating plate  1  is connected to the cup holder  4  by using the elastic piece  5  as an elastic support. The elastic piece  5  includes an inner ring part  51 , at least two outer arc parts  52  that are concentric with and in clearance fit with the inner ring part  51 , and at least two connection parts  53  connecting tail ends of the outer arc parts  52  to the inner ring part  51 . The inner ring part  51 , the outer arc parts  52 , and the connection parts  53  are an integrated structure that is formed by punching a steel sheet. In a preferred solution, a quantity of the outer arc parts  52  is three, and the three outer arc parts  52  are evenly arranged on the periphery of the inner ring part  51 . 
     For ease of connecting the vibrating plate  1  to the cup holder  4  by using the elastic piece  5 , the vibrating plate  1  includes a plate body  11  having a diameter the same as that of the brim  41  of the cup holder  4 , a side of the plate body  11  being provided with three fixed feet  12  that are each fixedly connected to the front end of each outer arc part  52 . The inner ring part  51  is attached to and fixedly connected to the brim  41  of the cup holder  4 . Holder supporting blocks  42  correspondingly supporting the connection parts  53  are disposed on an outer sidewall of the cup holder  4 . During specific implementation, according to requirements, the front ends of the outer arc parts  52  may also be connected to the cup holder  4 , and the inner ring part  51  is connected to the vibrating plate  1 . The cup holder  4  is a tripod cup holder. The cup holder is not only a component of a magnetic circuit, but also an important part for fixing the elastic piece. 
     The magnet  3  is fixed at an internal central position of the cup holder  4 , the washer  6  having good magnetoconductivity is fixed on the magnet  3  in a gluing manner, the washer  6  is coaxial with the magnet  3 , and the washer  6  is disposed in an inner cavity of the voice coil  2  and in uniform clearance fit with the voice coil  2 . In a uniform magnetic field, affected by an audio current, the voice coil  2  converts magnetic field energy to mechanical energy according to the principle of the left hand rule, and a sound signal is conducted to a human body by means of mechanical vibrations.