A speaker that uses a piezoelectric chip to drive sound

Abstract

The present invention discloses a loudspeaker that utilizes a piezoelectric sheet to drive a sound. The loudspeaker utilizes the effect generated by the electric-to-force conversion characteristics of the piezoelectric sheet to drive a vibrating membrane to achieve a sound-generating effect. The vibration of the piezoelectric sheet itself and the vibration of the vibrating membrane under the instigation produce a comprehensive and complementary effect. The loudspeaker includes a loudspeaker body and a supporting structure. The loudspeaker body includes at least an internal functional layer. The supporting structure is used to support and fix the loudspeaker body, and a piezoelectric sheet driver is disposed inside the structure. The internal functional layer includes a skeleton with a plurality of leakage holes and a vibrating membrane adhered to the skeleton. The vibrating membrane has a metal surface layer, and a piezoelectric sheet in a planar form is adhered to the metal surface layer. The piezoelectric sheet has a first surface electrically connected to the metal surface layer and a second surface away from the vibrating membrane. The second surface of the piezoelectric sheet and the metal surface layer are electrically connected to the piezoelectric sheet driver, respectively. The loudspeaker of the present invention has excellent audio characteristics and a unique shape.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a loudspeaker driven by a piezoelectric sheet for sound generation. Background Art

[0002] There are basically three types of sound-generating principles of electroacoustic devices such as receivers (speakers):

[0003] ① It is based on the Ampere force on the energized coil in the magnetic field;

[0004] ② It is driven by the interaction between electrostatic forces (including the force between charges on the electret);

[0005] ③ It uses the electric-to-force conversion characteristics of materials such as piezoelectrics to achieve driving and sound generation. Summary of the invention

[0006] The main technical problem solved by the present invention is to provide a speaker that uses a piezoelectric sheet to drive sound. It uses the effect of the electric-to-mechanical conversion characteristics of the piezoelectric sheet to drive the vibration membrane to achieve the sound effect. The vibration of the piezoelectric sheet itself and the vibration of the vibration membrane driven by it produce a comprehensive and complementary effect.

[0007] The technical solution adopted by the present invention is as follows: a loudspeaker driven by a piezoelectric sheet for producing sound, characterized in that it includes a loudspeaker body and a supporting structure, the loudspeaker body includes at least an internal functional layer; the supporting structure is used to support and fix the loudspeaker body, and a piezoelectric sheet driver is arranged inside; the internal functional layer includes a skeleton provided with a plurality of leakage holes and a vibration membrane pasted on the skeleton, the vibration membrane has a metal surface layer, a flat piezoelectric sheet is pasted on the metal surface layer, the piezoelectric sheet has a first surface electrically connected to the metal surface layer and a second surface away from the vibration membrane, the second surface of the piezoelectric sheet and the metal surface layer are respectively electrically connected to the piezoelectric sheet driver.

[0008] In a feasible implementation manner, the speaker body is in the shape of a table lamp cover with a small diameter at the upper end, a large diameter at the lower end, and a hollow interior.

[0009] In a feasible implementation, the speaker body further includes an intermediate conductive layer and an external protective layer; the intermediate conductive layer includes a metal ring arranged at the upper end and / or the lower end of the internal functional layer, and the metal ring is electrically connected to the metal surface layer of the vibration membrane; the external protective layer covers the outside of the internal functional layer and the intermediate conductive layer.

[0010] In a feasible implementation manner, the supporting structure includes: a chassis, a column erected on the chassis, a fixing ring fixed on the column, and a plurality of supporting rods extending from the fixing ring; the speaker body is mounted on the supporting structure and is supported and fixed by the column and the plurality of supporting rods.

[0011] In a feasible implementation manner, a cavity is formed inside the chassis, and an electrical part including the piezoelectric film driver is disposed therein.

[0012] In a feasible implementation manner, the pillar has a hollow inner cavity, and the metal inner cavity is provided with a metal wire for electrically connecting the piezoelectric sheet and the piezoelectric sheet driver.

[0013] In a feasible implementation manner, the speaker further includes: an LED light strip arranged on the column.

[0014] In a feasible implementation, the lampshade-shaped speaker body is divided into a plurality of grid areas by a skeleton provided with leak holes, and the leak holes in each grid area and the vibrating membrane covering the leak holes constitute a relatively independent vibration unit; in other words, the vibrating membrane is divided into a plurality of vibration units by a plurality of leak holes; wherein a piezoelectric sheet is attached to each vibration unit. In principle, the piezoelectric sheet itself vibrates to generate sound, and the piezoelectric sheet drives the vibrating membrane in the grid area to vibrate to generate sound, and the two generate sound in combination to produce a comprehensive and complementary effect.

[0015] In a feasible implementation manner, a plurality of the piezoelectric sheets are attached to each vibration unit, and the plurality of piezoelectric sheets are of different lengths and are arranged in parallel.

[0016] In a feasible implementation manner, the vibration membrane is a metal membrane, a polymer membrane, or a biological membrane, and the metal surface layer is a metal layer evaporated on the surface of the vibration membrane.

[0017] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0018] The speaker of the present invention is an ultra-thin speaker that utilizes a piezoelectric sheet and a vibration membrane. It utilizes the effect generated by the electric-to-force conversion characteristics of the piezoelectric sheet to drive the vibration membrane to achieve the sound-generating effect. The vibration of the piezoelectric sheet itself and the vibration of the vibration membrane under the instigation produce a comprehensive and complementary effect, which can improve the low-frequency characteristics of the speaker, so that the speaker has better audio characteristics in the full frequency band. In addition, the vibration membrane of the speaker is attached to the frame and is separated into multiple relatively independent vibration units by multiple leak holes on the frame, which is equivalent to an array composed of multiple speaker units, ensuring excellent audio characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments and the description of the prior art will be briefly introduced below. 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 these drawings without paying creative work.

[0020] Figure 1 It is a cross-sectional structural diagram of a loudspeaker driven by a piezoelectric sheet for producing sound according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0022] The terms "first", "second", "third", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0023] The following is a detailed description of the solutions of the present invention by means of specific embodiments.

[0024] Please refer to Figure 1 One embodiment of the present invention provides a speaker that uses a piezoelectric sheet to drive sound. It uses the effect of the electric-to-mechanical conversion characteristics of the piezoelectric sheet to drive the vibration membrane to achieve the sound effect. The vibration of the piezoelectric sheet itself and the vibration of the vibration membrane under the instigation produce a comprehensive and complementary effect.

[0025] like Figure 1 As shown, the speaker comprises a speaker body 1 and a support structure 2. The support structure 2 is used to support and fix the speaker body 1. The speaker body 1 comprises at least an internal functional layer 11; further, it may also comprise an intermediate conductive layer 12 and an external protective layer 13.

[0026] The internal functional layer 11 may include a skeleton provided with a plurality of leak holes and a vibration membrane attached to the skeleton, wherein the vibration membrane has a metal surface layer, a planar piezoelectric sheet is attached to the metal surface layer, the piezoelectric sheet has a first surface electrically connected to the metal surface layer and a second surface away from the vibration membrane, and the second surface of the piezoelectric sheet and the metal surface layer are electrically connected to a piezoelectric sheet driver, respectively. The piezoelectric sheet driver may be arranged inside the support structure 2.

[0027] The intermediate conductive layer 12 includes a metal ring disposed at the upper end and / or the lower end of the internal functional layer, and the metal ring is electrically connected to the metal surface layer of the vibration membrane.

[0028] The external protective layer 13 covers the outside of the internal functional layer and the intermediate conductive layer to protect the speaker body.

[0029] Optionally, in the internal functional layer 11, the vibration membrane is divided into a plurality of vibration units by the plurality of leak holes, and each vibration unit is attached with the piezoelectric sheet. Specifically, each vibration unit may be attached with a plurality of piezoelectric sheets, and the plurality of piezoelectric sheets are of different lengths and arranged in parallel.

[0030] Optionally, the speaker body 1 is in the shape of a table lamp cover with a small diameter at the upper end and a large diameter at the lower end and a hollow interior. The speaker body 1 in the shape of a table lamp cover is installed on the supporting structure 2 in a sleeve manner to form a speaker system with an overall shape of a table lamp.

[0031] Optionally, the supporting structure 2 includes: a chassis 21, a column 22 erected on the chassis 21, a fixing ring 23 fixed on the column 22, and a plurality of supporting rods 24 extending from the fixing ring 23; the speaker body 1 is mounted on the supporting structure 2, and is supported and fixed by the column 22 and the plurality of supporting rods 24.

[0032] Optionally, the column 22 is also provided with an LED light strip 25 for lighting. This makes the speaker system not only similar to a desk lamp in shape, but also actually functions as a desk lamp, which is equivalent to combining a speaker and a desk lamp into one. There can be multiple LED light strips 25, for example, 3 to 4 LED light strips can be erected on the outer surface of the column 22 for lighting.

[0033] Optionally, the chassis 21 has an internal cavity, which serves to stabilize the entire speaker system and to house electrical parts such as a piezoelectric driver (and may also include a control part) in the cavity.

[0034] Optionally, the column 22 is hollow. Its functions are: first, to support the speaker system and to support and fix the desk lamp shade-style speaker body 1 that utilizes a planar piezoelectric sheet to drive sound through a fixing ring 23 and a supporting rod 24; second, wiring can be routed through its hollow inner cavity, and a metal wire used to electrically connect the piezoelectric sheet and the piezoelectric sheet driver can pass through it. In addition to routing wiring, the top of the column 22 can also serve to fix the speaker body 1.

[0035] To facilitate understanding of the present invention, the composition and materials of the loudspeaker body 1 are further described in detail.

[0036] As described above, the speaker body 1 is a speaker structure in the shape of a table lampshade that is driven to generate sound by a flat piezoelectric sheet, and it is divided into three layers. The innermost layer is an internal functional layer, whose skeleton can be made of a firm plastic material and provided with a plurality of leak holes, on which a taut vibration membrane is pasted, and the vibration membrane can form a conductive metal layer as a metal surface layer through a vapor deposition process, and the metal surface layer faces outward (away from the skeleton). On the metal surface layer of a plurality of single-diaphragm plastic films separated by the leak holes, piezoelectric sheets such as ceramic piezoelectric sheets with metal materials on both sides of the same or different sizes can be pasted with conductive glue. The second surface (second electrode) of the piezoelectric sheet facing outward can be led out with a metal wire and connected to the piezoelectric driver in the chassis through the hollow inner cavity of the column, and the first surface (first electrode) of the piezoelectric sheet facing inward is electrically connected to the middle conductive layer.

[0037] The intermediate conductive layer can be a thin copper ring placed on the upper part (upper end) and / or lower part (lower end) of the internal functional layer. Its function is to be electrically connected to the conductive metal surface layer on the surface of the vibration membrane, that is, to the first surface (first electrode) of the piezoelectric piece. In addition, the intermediate conductive layer is also connected to the piezoelectric driver in the chassis using a metal wire that passes through the hollow inner cavity of the column.

[0038] Optionally, the piezoelectric sheet in this embodiment can be a PZT (lead zirconate titanate) multilayer composite piezoelectric electroacoustic transducer sheet with uniform or different lengths. Of course, piezoelectric sheets of other materials can also be used. The two sides (two poles) of the piezoelectric sheet are respectively connected to the two output terminals of the piezoelectric sheet driver of the chassis through metal wires to receive the drive.

[0039] The outermost external protective layer is used to cover the piezoelectric sheet and the like, for example, by using a wider frame bar or other structure, so as to protect the internal functional layer and the intermediate conductive layer. Optionally, a transparent plastic film may be attached to the inner surface of the outer protective layer to protect the metal surface layer of the innermost vibration membrane surface.

[0040] Optionally, in this embodiment, the vibration membrane can be a plastic film such as a polymer vibration membrane (for example, a polyimide vibration membrane), a metal membrane, or a biological membrane (for example, an animal membrane such as snake skin or fish skin). The vibration membrane and the piezoelectric sheet are combined to form an ultra-thin speaker as the speaker body.

[0041] If a metal film is used, it should be a thin metal film. Optionally, when a metal film is used, the middle conductive layer as the second layer of the speaker body, that is, the thin copper ring placed on the upper and / or lower part of the internal functional layer can be omitted, and an insulating ring made of plastic material can be used for isolation and insulation. That is, the middle conductive layer can include a metal ring and / or an insulating ring, which is specifically determined by the material of the vibration film.

[0042] Due to the difference in materials, when the vibration membrane uses a polymer vibration membrane (for example, a polyimide vibration membrane), a metal membrane, or a certain biological membrane (for example, snake skin, fish skin and other animal membranes), the speaker body obtained by combining it with the piezoelectric sheet has different frequency response characteristics and effects. In actual applications, it can be selected according to needs.

[0043] As described above, this embodiment discloses a speaker that uses a piezoelectric sheet to drive and generate sound. The speaker uses the effect generated by the electric-to-force conversion characteristics of the piezoelectric sheet to push the tensioned vibration membrane to achieve the driving and sound generation. It uses the effect generated by the electric-to-force conversion characteristics of the piezoelectric sheet to push the vibration membrane to achieve the sound generation. The vibration of the piezoelectric sheet itself and the vibration of the vibration membrane under the instigation produce a comprehensive and complementary effect. In addition, the speaker adopts the shape of a desk lamp. It is a desk lamp speaker that uses a flat piezoelectric sheet to drive and generate sound.

[0044] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0045] ① The speaker of the present invention is an ultra-thin speaker that utilizes a piezoelectric sheet and a vibration membrane. It utilizes the effect generated by the electric-to-mechanical conversion characteristics of the piezoelectric sheet to drive the vibration membrane to achieve the driving and sound generation effects. The vibration of the piezoelectric sheet itself and the vibration of the vibration membrane under the instigation produce a comprehensive and complementary effect, which can improve the low-frequency characteristics of the speaker and make the speaker have better audio characteristics in the full frequency band. The vibration membrane of the speaker is attached to the frame and is separated into multiple relatively independent vibration units by multiple leak holes on the frame, which is equivalent to an array composed of multiple speaker units and has excellent audio characteristics.

[0046] ② The speaker of the present invention has a speaker body in the shape of a table lamp cover, which is mounted on the supporting structure below and has the shape of a table lamp as a whole, which is equivalent to combining the speaker and the table lamp into one, and has high aesthetic value and use value.

[0047] The technical solution of the present invention is described in detail above through specific embodiments. In the above embodiments, the description of each embodiment has its own emphasis. For the part that is not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0048] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art may modify the technical solutions described in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A speaker driven by a piezoelectric sheet, characterized in that: The speaker body comprises a speaker body and a supporting structure, wherein the speaker body comprises at least an internal functional layer; The support structure is used to support and fix the speaker body, and a piezoelectric driver is arranged inside; The internal functional layer includes a skeleton provided with a plurality of leakage holes and a vibration membrane attached to the skeleton, the vibration membrane has a metal surface layer, a flat piezoelectric sheet is attached to the metal surface layer, the piezoelectric sheet has a first surface electrically connected to the metal surface layer and a second surface away from the vibration membrane, the second surface of the piezoelectric sheet and the metal surface layer are electrically connected to the piezoelectric sheet driver respectively; The speaker body is in the shape of a table lamp cover with a small diameter at the upper end, a large diameter at the lower end, and a hollow interior; The speaker body also includes an intermediate conductive layer and an outer protective layer; The intermediate conductive layer comprises a metal ring disposed at the upper end and / or the lower end of the internal functional layer, wherein the metal ring is electrically connected to the metal surface layer of the vibration membrane; The external protective layer covers the outside of the internal functional layer and the intermediate conductive layer; The vibration membrane is divided into a plurality of vibration units by a plurality of the leakage holes, and the piezoelectric sheet is pasted on each vibration unit; A plurality of piezoelectric sheets are attached to each vibration unit, and the plurality of piezoelectric sheets are of different lengths and arranged in parallel; The multiple vibration units are relatively independent.

2. The loudspeaker according to claim 1, characterized in that The supporting structure includes: a chassis, a column erected on the chassis, a fixing ring fixed on the column, and a plurality of supporting rods extending from the fixing ring; the speaker body is sleeved on the supporting structure and is supported and fixed by the column and the plurality of supporting rods.

3. The loudspeaker according to claim 2, characterized in that A cavity is formed inside the chassis, and an electrical part including the piezoelectric film driver is arranged therein.

4. The loudspeaker according to claim 2, characterized in that The pillar has a hollow inner cavity, and a metal wire for electrically connecting the piezoelectric sheet and the piezoelectric sheet driver is arranged in the hollow inner cavity.

5. The loudspeaker according to claim 2, characterized in that Also includes: An LED light strip is arranged on the column.

6. The loudspeaker according to claim 1, characterized in that The vibration membrane is a metal membrane, a polymer membrane or a biological membrane, and the metal surface layer is a metal layer evaporated on the surface of the vibration membrane.

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