Electroacoustic transducer and earphone

Abstract

The utility model discloses an electroacoustic transducer and an earphone, and relates to the technical field of loudspeakers, the electroacoustic transducer comprises a mounting shell, a horn cover, a moving coil horn and a piezoelectric ceramic piece; the loudspeaker cover covers the mounting shell, an accommodating cavity is defined by the loudspeaker cover, and the loudspeaker cover is provided with a sound outlet hole communicated with the accommodating cavity; the moving coil loudspeaker is arranged in the accommodating cavity; the piezoelectric ceramic piece is arranged on one surface of the loudspeaker cover and is connected in parallel with the moving coil loudspeaker; according to the technical scheme provided by the utility model, the loudspeaker cover can be driven to produce sound through the vibration of the piezoelectric ceramic piece, the piezoelectric ceramic piece plays a role in high pitch compensation, only one low pitch moving coil loudspeaker needs to be designed, frequency division design is not needed, the number of arranged chips is reduced, the overall size of the electroacoustic transducer is relatively small, and the cost is low. And the miniaturization design of the electroacoustic transducer is further facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of loudspeakers, in particular to an electroacoustic transducer and an earphone. Background Art

[0002] Speakers, also known as loudspeakers, are widely used in the assembly of electronic products such as headphones and speakers. Currently, speakers are divided into tweeters and woofers. Bandwidth widening is generally achieved by splitting the woofer and tweeter to boost high frequencies. This requires two chips and more structural space to accommodate the two speakers, resulting in a larger overall speaker size, which is not conducive to miniaturization. Utility Model Content

[0003] The main purpose of the utility model is to provide an electroacoustic transducer and earphones, aiming to reduce the overall size of a speaker, thereby facilitating a miniaturized design of the speaker.

[0004] To achieve the above-mentioned object, the present invention provides an electroacoustic transducer, which comprises:

[0005] Install the shell;

[0006] A speaker cover is provided on the mounting shell to enclose a receiving cavity, and the speaker cover is provided with a sound outlet hole communicating with the receiving cavity;

[0007] A dynamic speaker, the dynamic speaker being arranged in the accommodating cavity;

[0008] A piezoelectric ceramic sheet is provided on a surface of the speaker cover and is connected in parallel with the dynamic speaker.

[0009] In one embodiment, the piezoelectric ceramic sheets are provided in a number of at least two, wherein two of the piezoelectric ceramic sheets are arranged opposite to each other on two surfaces of the speaker cover or are arranged at intervals on the same surface of the mounting shell, each of the piezoelectric ceramic sheets is connected in parallel with the dynamic speaker, and each of the piezoelectric ceramic sheets has the same vibration direction.

[0010] In one embodiment, the piezoelectric ceramic sheets are provided in two numbers, and the two piezoelectric ceramic sheets are arranged opposite to each other on two surfaces of the speaker cover.

[0011] In one embodiment, the sound outlet is provided in the middle of the speaker cover, and the two piezoelectric ceramic sheets are both annular structures and are both arranged around the outside of the sound outlet.

[0012] In one embodiment, the sound outlet is disposed adjacent to an edge of the speaker cover, and the two piezoelectric ceramic sheets are both located inside the sound outlet.

[0013] In one embodiment, the two piezoelectric ceramic sheets are connected in parallel to the dynamic speaker via connecting wires; or, the two piezoelectric ceramic sheets are connected in parallel to the dynamic speaker via a flexible circuit board.

[0014] In one embodiment, the two piezoelectric ceramic sheets are connected in parallel to the dynamic speaker via a flexible circuit board; the speaker cover is further provided with an avoidance through hole or avoidance gap for the flexible circuit board to pass through.

[0015] In one embodiment, the piezoelectric ceramic sheets are provided in two numbers, and the two piezoelectric ceramic sheets are spaced apart and arranged on the same surface of the speaker cover.

[0016] In one embodiment, the speaker cover is a cover-shaped structure, or the speaker cover is a sheet-shaped structure.

[0017] The present invention also provides an earphone, which comprises the electroacoustic transducer as described above.

[0018] The technical solution of the present invention is to set a piezoelectric ceramic sheet on the surface of the speaker cover and connect the piezoelectric ceramic sheet and the dynamic speaker in parallel. Such a setting can drive the speaker cover to produce sound through the vibration of the piezoelectric ceramic sheet. The piezoelectric ceramic sheet plays the role of treble compensation, and only one bass dynamic speaker needs to be designed. No frequency division design is required, which reduces the number of chip settings. The overall size of the electroacoustic transducer is relatively small, which is conducive to the miniaturization design of the electroacoustic transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the partial structure of an embodiment of the electroacoustic transducer provided by the utility model;

[0021] Figure 2 for Figure 1 Structural diagram from another perspective;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure from another perspective;

[0023] Figure 4 A schematic diagram of the partial structure of another embodiment of the electroacoustic transducer provided by the utility model;

[0024] Figure 5 for Figure 4 Structural diagram from another perspective;

[0025] Figure 6 for Figure 4 A schematic diagram of the structure from another perspective;

[0026] Figure 7 A schematic diagram of the partial structure of another embodiment of the electroacoustic transducer provided by the present utility model;

[0027] Figure 8 for Figure 7 Structural diagram from another perspective;

[0028] Figure 9 for Figure 7 A schematic diagram of the structure from another perspective;

[0029] Description of Figure Numbers:

[0030] 1. Speaker cover; 11. Sound outlet; 12. Avoidance through-hole; 13. Avoidance notch; 2. First piezoelectric ceramic sheet; 3. Second piezoelectric ceramic sheet; 4. Flexible circuit board; 41. Main body; 42. First connecting part; 43. Second connecting part; 44. Third connecting part; 45. Fourth connecting part; 5. Solder ball.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The utility model provides an electroacoustic transducer, which aims to reduce the overall size of a loudspeaker, thereby facilitating a miniaturized design of the loudspeaker.

[0036] See also Figure 1 In one embodiment of the present invention, the electroacoustic transducer includes a mounting shell (not shown), a speaker cover 1, a dynamic speaker (not shown) and a piezoelectric ceramic piece. The speaker cover 1 is covered on the mounting shell and encloses a receiving cavity. The speaker cover 1 is provided with a sound outlet 11 connected to the receiving cavity; the dynamic speaker is arranged in the receiving cavity; the piezoelectric ceramic piece is arranged on a surface of the speaker cover 1 and is connected in parallel with the dynamic speaker.

[0037] Specifically, the material of the mounting shell can be selected from metal or plastic. The shape and specific structure of the mounting shell are not limited, as long as a receiving cavity with an opening at one end is defined inside. The material of the speaker cover 1 can be selected from metal or plastic. The speaker cover 1 is arranged to cover the opening of the mounting shell and together form the receiving cavity. The connection method between the speaker cover 1 and the mounting shell can be a snap connection, a rotation connection or other reasonable connection method, which is not limited here. The dynamic speaker is arranged in the receiving cavity and is arranged corresponding to the speaker cover 1. Its specific structure and specific setting method are not limited. Reference can be made to the existing technology and will not be repeated here. The piezoelectric ceramic sheet is fixed to any surface of the speaker cover 1 by gluing. Its specific shape and setting position are not limited. The positive and negative electrodes of the piezoelectric ceramic sheet are connected in parallel with the positive and negative electrodes of the dynamic speaker. According to the vibration direction of the dynamic speaker and the piezoelectric ceramic sheet, it can be set as follows: the positive electrode of the piezoelectric ceramic sheet is connected to the positive electrode of the dynamic speaker, and the negative electrode of the piezoelectric ceramic sheet is connected to the negative electrode of the dynamic speaker; of course, it can also be set as follows: the negative electrode of the piezoelectric ceramic sheet is connected to the positive electrode of the dynamic speaker, and the positive electrode of the piezoelectric ceramic sheet is connected to the negative electrode of the dynamic speaker.

[0038] The technical solution of the present invention is to set a piezoelectric ceramic piece on the surface of the speaker cover 1 and connect the piezoelectric ceramic piece and the dynamic speaker in parallel. With such a setting, the speaker cover 1 can be driven to produce sound through the vibration of the piezoelectric ceramic piece. The piezoelectric ceramic piece plays a role in treble compensation, and only one bass dynamic speaker needs to be designed. No frequency division design is required, which reduces the number of chips set. The overall size of the electroacoustic transducer is relatively small, which is conducive to the miniaturization design of the electroacoustic transducer.

[0039] In one embodiment of the present invention, there are at least two piezoelectric ceramic sheets, two of which are arranged oppositely on two surfaces of the speaker cover 1 or spaced apart on the same surface of the mounting shell. Each piezoelectric ceramic sheet is connected in parallel with the dynamic speaker, and the vibration direction of each piezoelectric ceramic sheet is the same.

[0040] In this embodiment, two or more piezoelectric ceramic sheets are provided. The piezoelectric ceramic sheets can be glued and fixed on the same surface of the speaker cover 1, or can be glued and fixed on the two surfaces of the speaker cover 1 relative to each other. The specific setting position is not limited, and each piezoelectric ceramic sheet is connected in parallel with the dynamic speaker. The parallel connection method can refer to the above embodiment. At the same time, the vibration direction of each piezoelectric ceramic sheet is the same, which can effectively realize the sound generation of the speaker cover 1 through the vibration of the piezoelectric ceramic sheet. The piezoelectric ceramic sheet plays a better treble compensation role, so that the amplitude of the electroacoustic transducer is higher, and thus its sound pressure level is higher. In addition, it is also beneficial to meet the needs of various application scenarios.

[0041] See also Figures 1 to 3 In one embodiment of the present invention, two piezoelectric ceramic sheets are provided, and the two piezoelectric ceramic sheets are arranged on two surfaces of the speaker cover 1 opposite to each other.

[0042] In this embodiment, two piezoelectric ceramic plates are adhesively bonded to opposite surfaces of the speaker cover 1, each connected in parallel with the dynamic speaker. The parallel connection method can be found in the previous embodiment and will not be detailed here. The two piezoelectric ceramic plates provide excellent treble compensation, with treble reaching up to 40 kHz.

[0043] It should be noted that in this embodiment, the piezoelectric ceramic piece can be square, circular, annular, polygonal or other reasonable shapes, and the speaker cover 1 can be a circular cover body, a square cover body, a disc, a square sheet or other reasonable shapes, which are not limited here.

[0044] In a specific embodiment of the present invention, the speaker cover 1 is a circular cover structure, the specific structure of which is not limited. The sound outlet 11 is circular and is located in the middle of the speaker cover 1. Two piezoelectric ceramic plates are provided, namely a first piezoelectric ceramic plate 2 and a second piezoelectric ceramic plate 3. The first piezoelectric ceramic plate 2 and the second piezoelectric ceramic plate 3 are both annular structures, and their inner diameters are not less than the radial dimensions of the sound outlet 11. The first piezoelectric ceramic plate 2 is fixed to the first surface of the speaker cover 1 by adhesive and surrounds the outside of the sound outlet 11. The second piezoelectric ceramic plate 3 is fixed to the second surface of the speaker cover 1 by adhesive and surrounds the outside of the sound outlet 11. The positive and negative electrodes of the first piezoelectric ceramic plate 2 are connected in parallel with the positive and negative electrodes of the dynamic speaker, and the positive and negative electrodes of the second piezoelectric ceramic plate 3 are connected in parallel with the positive and negative electrodes of the dynamic speaker. The specific connection method can be referred to in the above embodiment and is not limited here. It should be noted that the parallel connection method can be to use a connecting wire or a flexible circuit board 4, that is, the positive and negative electrodes of the first piezoelectric ceramic piece 2 are connected in parallel with the positive and negative electrodes of the dynamic speaker through the connecting wire or the flexible circuit board 4, and the positive and negative electrodes of the second piezoelectric ceramic piece 3 are connected in parallel with the positive and negative electrodes of the dynamic speaker through the connecting wire or the flexible circuit board 4.

[0045] In an optional embodiment of the present invention, the positive and negative electrodes of the first piezoelectric ceramic piece 2 are connected in parallel with the positive and negative electrodes of the dynamic speaker through the flexible circuit board 4, and the positive and negative electrodes of the second piezoelectric ceramic piece 3 are connected in parallel with the positive and negative electrodes of the dynamic speaker through the flexible circuit board 4. Due to the freely bendable nature of the flexible circuit board 4, its connection operation is convenient, and it is also beneficial for the first piezoelectric ceramic piece 2 and the second piezoelectric ceramic piece 3 to have a larger amplitude range, thereby achieving a better treble compensation effect.

[0046] In a specific embodiment of the present invention, the flexible circuit board 4 includes a main body 41, a first connecting portion 42, a second connecting portion 43, a third connecting portion 44, and a fourth connecting portion 45. The first connecting portion 42 is provided with two contacts, respectively connected to the positive and negative electrodes of the first piezoelectric ceramic 2. The connection method can be soldering with solder balls 5, connecting to a circuit board, or other reasonable methods. The second connecting portion 43 is provided with two contacts, respectively connected to the positive and negative electrodes of the second piezoelectric ceramic 3. The connection method can be soldering with solder balls 5, connecting to a circuit board, or other reasonable methods. The third connecting portion 44 and the fourth connecting portion 45 are respectively connected to the positive and negative electrodes of the dynamic speaker. The connection methods can also be soldering with solder balls 5, connecting to a circuit board, or other reasonable methods. When the speaker cover 1 is a metal cover, the negative electrode of the first piezoelectric ceramic 2 and the negative electrode of the second piezoelectric ceramic 3 are electrically connected through the speaker cover 1. In this case, the second connecting portion 43 only needs to be connected to the positive electrode of the second piezoelectric ceramic 3. It should be noted that the specific structural shapes of the main body 41 , the first connecting portion 42 , the second connecting portion 43 , the third connecting portion 44 and the fourth connecting portion 45 are not limited, as long as the above-mentioned connection can be achieved.

[0047] In some embodiments, to facilitate connection of the flexible circuit board 4, the speaker cover 1 is provided with a through-hole 12. This through-hole 12 extends through two opposing surfaces of the speaker cover 1 and is located outside the second piezoelectric ceramic sheet 3. During connection, the second connecting portion 43 passes through the through-hole 12 and connects to the second piezoelectric ceramic sheet 3. It should be noted that the specific shape and size of the through-hole 12 are not limited; any shape and size are acceptable as long as they allow the second connecting portion 43 to pass through.

[0048] Of course, in some other embodiments, in order to facilitate the connection operation of the flexible circuit board 4, the speaker cover 1 is also provided with an avoidance gap 13, which runs through the two opposite surfaces and sides of the speaker cover 1. The avoidance gap 13 can allow the second connecting portion 43 to pass through to connect with the second piezoelectric ceramic piece 3.

[0049] See also Figures 4 to 6 In another embodiment of the present invention, the sound hole 11 is arranged adjacent to the edge of the speaker cover 1 , and two piezoelectric ceramic sheets are provided. The two piezoelectric ceramic sheets are arranged on two surfaces of the speaker cover 1 opposite to each other.

[0050] Specifically, the speaker cover 1 is a circular cover structure, the shape of the sound hole 11 is not limited, the sound hole 11 is arranged adjacent to the edge of the speaker cover 1, and the piezoelectric ceramic sheet includes a first piezoelectric ceramic sheet 2 and a second piezoelectric ceramic sheet 3. The first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 are respectively glued and fixed to the first surface and the second surface of the speaker cover 1, and are both located on the inner side of the sound hole 11. The shapes of the first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 can be selected as square, square or other reasonable shapes, which are not limited here.

[0051] The first piezoelectric ceramic piece 2 and the second piezoelectric ceramic piece 3 are both connected in parallel to the dynamic speaker through connecting wires or a flexible circuit board 4. The specific connection method can refer to the above embodiment and will not be repeated here.

[0052] Optionally, a plurality of sound outlet holes 11 are provided, and the plurality of sound outlet holes 11 are distributed at intervals along the circumference of the speaker cover 1 .

[0053] See also Figures 7 to 9 As shown, in another embodiment of the present invention, two piezoelectric ceramic sheets are provided, and the two piezoelectric ceramic sheets are spaced apart and arranged on the same surface of the speaker cover 1 .

[0054] In this embodiment, the piezoelectric ceramic sheets include a first piezoelectric ceramic sheet 2 and a second piezoelectric ceramic sheet 3. The first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 can be fixed to the first surface of the speaker cover 1 or to the second surface of the speaker cover 1 with adhesive at intervals. The specific shapes of the first piezoelectric ceramic sheet 2, the second piezoelectric ceramic sheet 3, and the speaker cover 1 are not limited, and the specific placement of the first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 is also not limited. The first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 are both connected in parallel to the dynamic speaker via connecting wires or a flexible circuit board 4. The specific connection method can be referred to in the above embodiment and will not be detailed here.

[0055] It should be noted that the position and shape of the sound outlet 11 are not limited. When two piezoelectric ceramic sheets are spaced apart and arranged on the same surface of the speaker cover 1, the speaker cover 1 does not need to have the avoidance through hole 12 or the avoidance notch 13.

[0056] In a specific embodiment, a plurality of sound holes 11 are provided, and the plurality of sound holes 11 are spaced apart along the circumference of the speaker cover 1. The first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 are glued and fixed to the first surface of the speaker cover 1 at intervals, and are both located on the inner side of the sound hole 11. Optionally, the sound hole 11 is in the shape of a long strip, and the first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 are in the shape of a rectangle.

[0057] Of course, in some other embodiments, the speaker cover 1 is a sheet-like structure, and its specific shape is not limited. The shapes and specific arrangement positions of the first piezoelectric ceramic sheet 2 and the second piezoelectric ceramic sheet 3 are not limited.

[0058] The present invention also provides a headset, which includes an electroacoustic transducer. The specific structure of the electroacoustic transducer is referred to the above embodiment. Since the headset adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. Among them, the headset can be optionally a wireless Bluetooth headset, specifically a TWS (True Wireless Stereo) Bluetooth headset or an OWS (Open Wearable Stereo) Bluetooth headset.

[0059] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electroacoustic transducer, characterized in that: The electroacoustic transducer comprises: Install the shell; A speaker cover is provided on the mounting shell to enclose a receiving cavity, and the speaker cover is provided with a sound outlet hole communicating with the receiving cavity; A dynamic speaker, the dynamic speaker being arranged in the accommodating cavity; a piezoelectric ceramic sheet, the piezoelectric ceramic sheet being disposed on a surface of the speaker cover and connected in parallel with the dynamic speaker; There are at least two piezoelectric ceramic sheets, two of which are arranged on two surfaces of the speaker cover opposite to each other or spaced apart on the same surface of the mounting shell, each of which is connected in parallel to the dynamic speaker, and each of which has the same vibration direction; The piezoelectric ceramic sheet is spaced apart from the sound outlet.

2. The electroacoustic transducer according to claim 1, wherein The piezoelectric ceramic sheets are provided in two pieces, and the two piezoelectric ceramic sheets are arranged opposite to each other on two surfaces of the speaker cover.

3. The electroacoustic transducer according to claim 2, wherein: The sound outlet is arranged adjacent to the edge of the speaker cover, and the two piezoelectric ceramic sheets are both located inside the sound outlet.

4. The electroacoustic transducer according to claim 2, wherein: The two piezoelectric ceramic sheets are connected in parallel to the dynamic speaker via connecting wires; or, The two piezoelectric ceramic sheets are connected in parallel to the dynamic speaker via a flexible circuit board.

5. The electroacoustic transducer according to claim 4, characterized in that The two piezoelectric ceramic sheets are connected in parallel to the dynamic speaker via a flexible circuit board; The speaker cover is further provided with an avoidance through hole or an avoidance notch for the flexible circuit board to pass through.

6. The electroacoustic transducer according to claim 1, wherein The piezoelectric ceramic sheets are provided in two pieces, and the two piezoelectric ceramic sheets are spaced apart and arranged on the same surface of the speaker cover.

7. The electroacoustic transducer according to any one of claims 1 to 6, characterized in that: The speaker cover is a cover-shaped structure, or, The speaker cover is a sheet-like structure.

8. A headset, characterized in that: The earphone comprises the electroacoustic transducer according to any one of claims 1 to 7.

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