Sound production unit

Abstract

The present invention provides a sound production unit, comprising a frame, and a vibration system and a magnetic circuit system which are fixed to the frame. The vibration system comprises a diaphragm, a voice coil for driving the diaphragm to vibrate to produce sound, and a flexible circuit board electrically connected to the voice coil. The flexible circuit board comprises a first fixing portion, a first elastic arm extending from the first fixing portion in a first direction, a second elastic arm extending from the first elastic arm in a second direction, and a second fixing portion connected to the second elastic arm. The first direction is not parallel to the second direction. In the present invention, by providing two elastic arms extending in different directions, the first fixing portion and the second fixing portion are located on two planes, and the elastic arms, taken as a whole, have a three-dimensional shape, so that the moment arm length of the flexible circuit board can be fully utilized, thereby increasing the vibration sound production sensitivity of the sound production unit.

Description

Sound emitting unit TECHNICAL FIELD

[0001] The present application relates to the field of audio equipment, and particularly relates to a sound emitting unit. BACKGROUND

[0002] With the development of electronic technology, portable consumer electronic devices are more and more popular, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices, etc. These electronic devices generally use voice for system feedback, such as incoming call prompts of mobile phones, navigation prompts, etc. These will use sound emitting units.

[0003] The sound emitting unit in the related art comprises a frame, a vibration system and a magnetic circuit system fixed on the frame, the vibration system comprises a diaphragm, a voice coil for driving the diaphragm to vibrate and emit sound, and a flexible circuit board electrically connected with the voice coil, the voice coil is connected to the solder pad of the sound emitting unit through the flexible circuit board, the flexible circuit board is generally a plane, and only a support part extended from the dome of the diaphragm can be used to support the flexible circuit board to realize the connection between the flexible circuit board and the lead wire of the voice coil. However, the support part extended from the dome occupies the space of the magnetic circuit system, and causes the waste of the length of the force arm of the flexible circuit board, which is not conducive to the vibration of the flexible circuit board and the sensitivity of the sound emitting unit.

[0004] Therefore, it is necessary to provide a new technical scheme to solve the above problems. TECHNICAL PROBLEM

[0005] The present application aims to provide a sound emitting unit with high utilization rate of the length of the force arm of the flexible circuit board. TECHNICAL SOLUTION

[0006] The technical scheme of the present application is as follows: a sound production unit, comprising a frame, a vibration system and a magnetic circuit system fixed to the frame, the vibration system comprising a diaphragm, a voice coil for driving the diaphragm to vibrate and produce sound, and a flexible circuit board electrically connected to the voice coil, the flexible circuit board comprising a first fixed part, a first elastic arm extending from the first fixed part in a first direction, a second elastic arm extending from the first elastic arm in a second direction, and a second fixed part connected to the second elastic arm, the first direction being non-parallel to the second direction; the first elastic arm comprises a first bending part connected to one end of the first fixed part and extending towards the other end of the first fixed part, and a second bending part extending from the first bending part in the opposite direction towards the one end of the first fixed part, the first bending part being spaced apart from the first fixed part and the second bending part, and the first bending part being arc-shapedly connected to the first fixed part and the second bending part; the second elastic arm comprises a first arc part connected to the second bending part, an intermediate part extending from the first arc part in the second direction, and a second arc part extending from the intermediate part in a direction away from the first fixed part, the second arc part being connected to the second fixed part; the frame comprises a top wall, a bottom wall arranged opposite to the top wall, and a side wall connecting the top wall and the bottom wall; the side wall forms a receiving cavity, the voice coil is arranged in the receiving cavity, the first fixed part is fixed to the top wall, the diaphragm is fixed to the bottom wall, the second fixed part is fixed to the diaphragm, and the first fixed part and the second fixed part are arranged in parallel; the voice coil is fixed to the diaphragm and spaced apart from the second fixed part, and the lead wire of the voice coil is connected to the second fixed part.

[0007] Preferably, the second direction is the vibration direction of the diaphragm, and the first direction is a horizontal direction perpendicular to the vibration direction.

[0008] Preferably, solder pads are provided on the first fixed part and the second fixed part, the solder pads on the first fixed part are soldered to an external circuit, and the lead wire is soldered to the solder pads on the second fixed part to realize the connection between the voice coil and the external circuit.

[0009] Preferably, the voice coil is a rectangular structure with rounded corners, the number of flexible circuit boards is four, and two non-adjacent flexible circuit boards are distributed in a center-symmetric manner with respect to the center of the voice coil along the annular direction of the voice coil.

[0010] Preferably, the frame is a rectangular structure corresponding to the voice coil, the four flexible circuit boards are respectively fixed to the four corners of the frame, the shape of the first elastic arm is consistent with the shape of the rounded corners of the voice coil, and the four first elastic arms are arranged corresponding to the four rounded corners of the voice coil.

[0011] Preferably, the magnetic circuit system comprises a lower clamping plate, a main magnetic steel and a secondary magnetic steel fixed to the lower clamping plate, the secondary magnetic steel is arranged around the main magnetic steel to form a magnetic gap, and the voice coil is arranged in the magnetic gap; the magnetic circuit system further comprises a main pole core attached to the main magnetic steel and a secondary pole core attached to the secondary magnetic steel, the secondary pole core is arranged in a spaced manner with the flexible circuit board, and the secondary pole core is provided with a avoiding portion for avoiding the flexible circuit board.

[0012] Preferably, the first fixing portion, the first elastic arm, the second elastic arm and the second fixing portion are integrally formed. Advantages

[0013] Compared with the related art, the flexible circuit board comprises a first fixing portion, a first elastic arm extending in a first direction from the first fixing portion, a second elastic arm extending in a second direction from the first elastic arm, and a second fixing portion connected to the second elastic arm, and the first direction is not parallel to the second direction. By arranging two elastic arms extending in different directions, the first fixing portion and the second fixing portion are arranged on two planes, the length of the elastic arm of the flexible circuit board can be fully utilized, and the elastic arm as a whole has a three-dimensional shape, the elastic supporting force of the flexible circuit board is maximized, the vibration sound production sensitivity of the sound production unit is increased, the pressure received by the elastic arm is buffered, and the service life of the flexible circuit board is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a perspective view of a sound production unit provided by the present application;

[0015] Fig. 2 is a perspective view of the sound production unit provided by the present application without a magnetic circuit system;

[0016] Fig. 3 is a perspective view of a flexible circuit board in the sound production unit provided by the present application;

[0017] Fig. 4 is a perspective exploded view of the sound production unit provided by the present application;

[0018] In the drawings: sound production unit 100, yoke 20, top wall 21, bottom wall 22, side wall 23, accommodating cavity 231, vibration system 30, diaphragm 31, voice coil 32, lead wire 321, flexible circuit board 33, first fixing portion 331, first elastic arm 332, first bending portion 3321, second bending portion 3322, second elastic arm 333, first arc portion 3331, intermediate portion 3332, second arc portion 3333, second fixing portion 334, solder pad 335, magnetic circuit system 40, lower clamping plate 41, main magnetic steel 42, secondary magnetic steel 43, notch portion 431, main pole core 44, secondary pole core 45, avoiding portion 451, first direction X, second direction Z. Embodiments of the present application

[0019] The application will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and above drawings are intended to distinguish similar objects and not necessarily describe a particular sequential or chronological order. It is to be understood that the use of such terms herein is merely for distinguishing between objects in order to more clearly describe the embodiments of the application than using only "one" or "another" or "at least one of the objects. Moreover, the terms "comprising" and "having" and any variations thereof are intended to cover a non-exclusive inclusion.

[0021] Referring to FIGS. 1-4, the sound emitting unit 100 provided by the present application comprises a frame 20, a vibration system 30 and a magnetic circuit system 40 fixed to the frame 20; the vibration system 30 comprises a diaphragm 31, a voice coil 32 for driving the diaphragm 31 to vibrate and emit sound, and a flexible circuit board 33 electrically connected to the voice coil 32.

[0022] In order to make full use of the length of the force arm of the flexible circuit board 33, referring to FIGS. 3-4, the flexible circuit board 33 provided by the present application comprises a first fixed part 331, a first elastic arm 332 extending from the first fixed part 331 in a first direction X, a second elastic arm 333 extending from the first elastic arm 332 in a second direction Z, and a second fixed part 334 connected to the second elastic arm 333, wherein the first direction X is not parallel to the second direction Z. By setting the above structure, the first fixed part 331 and the second fixed part 334 of the flexible circuit board 33 are not in the same plane, and the first elastic arm 332 and the second elastic arm 333 are connected to the first fixed part 331 and the second fixed part 334 respectively, so that the elastic arm as a whole has a three-dimensional shape, which can maximize the elastic support force of the flexible circuit board 33, increase the vibration and sound emitting sensitivity of the sound emitting unit 100, buffer the pressure received by the elastic arm, and improve the service life of the flexible circuit board 33.

[0023] Preferably, in the present application, the second direction Z is the vibration direction of the diaphragm 31, and the first direction X is the horizontal direction perpendicular to the vibration direction, so that the placement position of the flexible circuit board 33 can be better designed, and a better support vibration effect can be achieved.

[0024] Specifically, please refer to FIG. 3, the first elastic arm 332 includes a first bending part 3321 connected with one end of the first fixed part 331 and extending to the other end of the first fixed part 331, and a second bending part 3322 extending from the first bending part 3321 to the one end of the first fixed part 331 in the opposite direction, the first bending part 3321 is arranged between the first fixed part 331 and the second bending part 3322, and the first bending part 3321 is arc-shaped transitionally connected with the first fixed part 331 and the second bending part 3322. The second elastic arm 333 includes a first arc part 3331 connected with the second bending part 3322, a middle part 3332 extending from the first arc part 3331 in the second direction Z, and a second arc part 3333 extending from the middle part 3332 to the direction away from the first fixed part 331, and the second arc part 3333 is connected with the second fixed part 334. The connection between the first elastic arm 332 and the second elastic arm 333 is arc-shaped, which can further buffer the elastic deformation of the elastic arm and prevent the elastic arm from breaking, thereby ensuring the service life of the flexible circuit board 33.

[0025] Further, please refer to FIG. 2 and FIG. 4, the frame 20 provided by the present application includes a top wall 21, a bottom wall 22 arranged opposite to the top wall 21, and a side wall 23 connecting the top wall 21 and the bottom wall 22; the side wall 23 surrounds a receiving cavity 231, and the voice coil 32 is arranged in the receiving cavity 231; the first fixed part 331 of the flexible circuit board 33 is fixed to the top wall 21 of the frame 20, the second fixed part 334 of the flexible circuit board 33 is fixed to the diaphragm 31, the diaphragm 31 is fixed to the bottom wall 22 of the frame 20, and the first fixed part 331 and the second fixed part 334 are arranged in parallel; the diaphragm 31 and the flexible circuit board 33 are fixedly connected only through the second fixed part 334, that is, the first elastic arm 332 and the second elastic arm 333 of the flexible circuit board 33 can be freely supported; in this way, the first fixed part 331 and the second fixed part 334 of the flexible circuit board 33 are arranged on two planes with different heights, and the first fixed part 331 and the second fixed part 334 are connected through the two elastic arms, compared with the flexible circuit board 33 in the prior art which is in a plane shape, the flexible circuit board 33 provided by the present application has better elastic support effect. It should be noted that the top wall 21 and the bottom wall 22 of the frame 20 here are only a relative expression, which is described from the placement position shown in the present application, and does not represent the placement direction in actual application.

[0026] Further, the voice coil 32 is also fixed to the diaphragm 31 and arranged in parallel with the second fixed part 334, that is, the flexible circuit board 33 is not directly fixed on the voice coil 32, but is electrically connected with the lead wire 321 of the voice coil 32 through the second fixed part 334 to realize the connection between the flexible circuit board 33 and the voice coil 32.

[0027] In order to make the electrical connection of the flexible circuit board 33 more stable, further referring to Figure 4, the first fixing part 331 and the second fixing part 334 of the flexible circuit board 33 are provided with the solder pad 335, the solder pad 335 on the first fixing part 331 is soldered with the external circuit, the lead 321 of the voice coil 32 is soldered with the solder pad 335 on the second fixing part 334, so as to realize the connection between the voice coil 32 and the external circuit, and the voice coil 32 drives the diaphragm 31 to vibrate and sound after being electrified; the setting of the solder pad 335 makes the electrical connection more stable, and prevents the lead 321 of the voice coil 32 from being disconnected due to vibration; according to actual needs, other ways can also be used to replace the solder pad 335, for example, conductive glue can be used for connection.

[0028] Further referring to Figures 2 and 4, the voice coil 32 is a rectangular structure with rounded corners, the number of the flexible circuit board 33 is four, along the annular direction of the voice coil 32, two adjacent flexible circuit boards 33 are symmetrically distributed with respect to the center of the voice coil 32, and the symmetrically arranged flexible circuit boards 33 can ensure the structural stability of the sound emitting unit 100. The yoke 20 is a rectangular structure corresponding to the voice coil 32, the four flexible circuit boards 33 are respectively fixed at the four corners of the yoke 20, the shape of the first elastic arm 332 is consistent with the shape of the rounded corner of the voice coil 32, and the four first elastic arms 332 are correspondingly arranged with the four rounded corners of the voice coil 32. The flexible circuit board 33 is fixed at the corner of the yoke 20, and the shape of the first elastic arm 332 is rounded, which can maximize the use of the vibration space and does not occupy the space of the magnetic circuit system 40, thereby ensuring the performance of the sound emitting unit 100.

[0029] Further referring to Figure 4, the magnetic circuit system 40 provided by the application comprises a lower clamping plate 41, a main magnetic steel 42 and a secondary magnetic steel 43 fixed on the lower clamping plate 41, the secondary magnetic steel 43 is arranged around the main magnetic steel 42 to form a magnetic gap, and the voice coil 32 is arranged in the magnetic gap; the magnetic circuit system 40 further comprises a main pole core 44 attached to the main magnetic steel 42 and a secondary pole core 45 attached to the secondary magnetic steel 43; the secondary pole core 45 is arranged in a spaced manner with the flexible circuit board 33, the secondary pole core 45 is provided with a avoiding part 451 for avoiding the flexible circuit board 33, and the outer periphery of the secondary magnetic steel 43 is also provided with a notch part 431 for avoiding the flexible circuit board 33, and the notch part 431 is correspondingly arranged with the avoiding part 451, so as to avoid the collision between the flexible circuit board 33 and the magnetic circuit system 40 during vibration.

[0030] Preferably, the first fixing part 331, the first elastic arm 332, the second elastic arm 333 and the second fixing part 334 are integrally formed.

[0031] Compared with the related art, the flexible circuit board 33 of the present application comprises a first fixed part 331, a first elastic arm 332 extending from the first fixed part 331 along a first direction X, a second elastic arm 333 extending from the first elastic arm 332 along a second direction Z, and a second fixed part 334 connecting the second elastic arm 333, wherein the first direction X is not parallel to the second direction Z. By arranging two elastic arms extending along different directions, the first fixed part 331 and the second fixed part 334 are located on two planes, the length of the elastic arm of the flexible circuit board 33 can be fully utilized, the elastic arm as a whole has a three-dimensional shape, the elastic supporting force of the flexible circuit board 33 is maximally increased, the vibration sound production sensitivity of the sound production unit 100 is increased, the pressure received by the elastic arm is buffered, and the service life of the flexible circuit board 33 is improved.

[0032] The above is only an embodiment of the present application, and it should be pointed out that those skilled in the art can make improvements without departing from the inventive concept, and these all belong to the protection scope of the present application.

Claims

1. A sound production unit, comprising a frame, and a vibration system and a magnetic circuit system fixed to the frame, the vibration system comprising a diaphragm, a voice coil driving the diaphragm to vibrate to produce sound, and a flexible circuit board electrically connected with the voice coil, characterized in that, The flexible circuit board comprises a first fixed part, a first elastic arm extending from the first fixed part in a first direction, a second elastic arm extending from the first elastic arm in a second direction, and a second fixed part connected to the second elastic arm, the first direction being non-parallel to the second direction; the first elastic arm comprises a first bending part connected to one end of the first fixed part and extending towards the other end of the first fixed part, and a second bending part extending from the first bending part in the opposite direction towards the one end of the first fixed part, the first bending part being spaced apart from the first fixed part and the second bending part, and the first bending part being arc-shaped transitionally connected to the first fixed part and the second bending part; the second elastic arm comprises a first arc part connected to the second bending part, a middle part extending from the first arc part in the second direction, and a second arc part extending from the middle part in a direction away from the first fixed part, the second arc part being connected to the second fixed part; the yoke comprises a top wall, a bottom wall oppositely arranged to the top wall, and a side wall connecting the top wall and the bottom wall; The side wall surrounds a receiving cavity, the voice coil is arranged in the receiving cavity, the first fixed part is fixed to the top wall, the diaphragm is fixed to the bottom wall, the second fixed part is fixed to the diaphragm, and the first fixed part and the second fixed part are arranged in parallel; the voice coil is fixed to the diaphragm and spaced apart from the second fixed part, and the lead wire of the voice coil is connected to the second fixed part.

2. The sound producing monomer of claim 1, wherein, The second direction is the vibration direction of the diaphragm, and the first direction is the horizontal direction perpendicular to the vibration direction.

3. The sound producing monomer of claim 1, wherein, The first fixed part and the second fixed part are both provided with pads, the pads on the first fixed part are welded with external circuits, and the lead wire is welded with the pads on the second fixed part to realize the connection of the voice coil and external circuits.

4. The sound producing monomer of claim 1, wherein, The voice coil is a rectangular structure with rounded corners, the number of flexible circuit boards is four, and along the annular direction of the voice coil, two non-adjacent flexible circuit boards are centrally symmetrically distributed relative to the center of the voice coil.

5. The sound producing monomer of claim 4, wherein, The yoke is a rectangular structure corresponding to the voice coil, four flexible circuit boards are respectively fixed to four corners of the yoke, the shape of the first elastic arm is consistent with the shape of the rounded corner of the voice coil, and four first elastic arms are correspondingly arranged with four rounded corners of the voice coil.

6. The sound producing monomer of claim 1, wherein, The magnetic circuit system comprises a lower clamping plate, a main magnetic steel and a secondary magnetic steel fixed to the lower clamping plate, the secondary magnetic steel is arranged around the main magnetic steel to form a magnetic gap, and the voice coil is arranged in the magnetic gap; the magnetic circuit system further comprises a main pole core attached to the main magnetic steel and a secondary pole core attached to the secondary magnetic steel, the secondary pole core is spaced apart from the flexible circuit board, and the secondary pole core is provided with a avoiding part for avoiding the flexible circuit board.

7. The sound producing monomer of claim 1, wherein, The first fixed part, the first elastic arm, the second elastic arm, and the second fixed part are integrally formed.

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