Method for tuning a flat panel acoustic transducer and tuned structure

Abstract

The method for tuning the flat acoustic transducer by area comprises the following steps: defining a forward center tuning area corresponding to the middle area of the diaphragm and a forward periphery tuning area corresponding to the periphery area of the diaphragm on the front cavity end face of the flat acoustic transducer; applying one or more layers of superimposed and combined tuning materials with different air permeability and thickness in the forward center tuning area and the forward periphery tuning area respectively; defining a backward center tuning area corresponding to the middle area of the diaphragm and a backward periphery tuning area corresponding to the periphery area of the diaphragm on the rear cavity end face of the flat acoustic transducer; and applying one or more layers of superimposed and combined tuning materials with different air permeability and thickness in the backward center tuning area and the backward periphery tuning area respectively. The structure for tuning the flat acoustic transducer by area comprises a flat acoustic transducer, a forward tuning system constructed on the front cavity end cover of the flat acoustic transducer, and a backward tuning system constructed on the rear cavity end cover of the flat acoustic transducer.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic technology, specifically to a method and structure for regional tuning of a planar acoustic transducer. Background Technology

[0002] A planar magnetic transducer, named for its planar unit transducer structure within its sound-producing cavity, is commonly used in headphones. The planar unit consists of a ring-shaped support and a diaphragm mounted on it. An electrical transducer coil is positioned in the center of the diaphragm. When the planar unit is placed in a magnetic field, and an audio signal is applied to the electrical transducer coil, the change in the audio signal causes the coil to move synchronously with the diaphragm within the magnetic field, thereby vibrating the air within the sound-producing cavity to produce sound.

[0003] The applicant discovered in the research that, for planar acoustic transducers, since the electrical transducer coil is located in the middle of the diaphragm, the amplitude in the middle region of the diaphragm is greater than that in the surrounding region, resulting in faster airflow exchange in the middle region of the planar acoustic transducer than in the surrounding region.

[0004] Traditionally, when tuning planar acoustic transducers, a uniformly dense tuning cloth is used in conjunction with the planar unit to achieve the desired high-frequency or low-frequency response. However, given the significantly uneven airflow exchange in different regions of planar acoustic transducers, the aforementioned traditional tuning method clearly cannot effectively balance the airflow, making it difficult to obtain a more ideal high-frequency or low-frequency response during tuning. Summary of the Invention

[0005] One of the objectives of this invention is to provide a regional tuning method for a planar acoustic transducer. Based on the airflow exchange efficiency of different regions of the diaphragm, tuning materials with different air permeability and thickness are used in different regions of the diaphragm to control the airflow exchange separately, thereby achieving a better tuning effect. The technical solution is as follows.

[0006] The method of regional tuning for planar acoustic transducers defines a forward center tuning zone corresponding to the central region of the diaphragm and a forward peripheral tuning zone corresponding to the peripheral region of the diaphragm on the front cavity end face of the planar acoustic transducer. One or more layers of tuning materials with different air permeability and thickness are applied to the forward center tuning zone and the forward peripheral tuning zone respectively to construct a forward tuning system.

[0007] A rearward center tuning zone corresponding to the central region of the diaphragm and a rearward peripheral tuning zone corresponding to the peripheral region of the diaphragm are defined on the rear cavity end face of the flat panel acoustic transducer. One or more layers of tuning materials with different air permeability and thickness are applied to the rearward center tuning zone and the rearward peripheral tuning zone respectively to construct a rearward tuning system.

[0008] Another objective of this invention is to provide a regional tuning structure for a planar acoustic transducer. Based on the aforementioned regional tuning method for planar acoustic transducers, a tuning structure with better tuning effect is achieved in the planar acoustic transducer. The technical solution is as follows.

[0009] The planar acoustic transducer features a zoned tuning structure. It includes a planar acoustic transducer with a forward-center tuning zone corresponding to the central region of the diaphragm and a forward-peripheral tuning zone corresponding to the peripheral region of the diaphragm defined on the front end cap. The forward-center tuning zone is a rectangular area inscribed within the circular outline of the diaphragm, while the forward-peripheral tuning zone is a circumscribed area formed by the tangent of the circular outline of the diaphragm to the forward-center tuning zone. One or more layers of tuning materials with varying permeability and thickness are applied to both the forward-center and forward-peripheral tuning zones to construct the forward tuning system.

[0010] On the rear cavity end cap of the flat panel acoustic transducer, a rearward center tuning area corresponding to the central region of the diaphragm and a rearward peripheral tuning area corresponding to the peripheral region of the diaphragm are defined. The rearward center tuning area is set as a rectangular area inscribed within the circular outline of the diaphragm, and the rearward peripheral tuning area is set as a circular area formed by the circular outline of the diaphragm being tangent to the rearward center tuning area. One or more layers of tuning materials with different air permeability and thickness are applied to the rearward center tuning area and the rearward peripheral tuning area respectively to construct a rearward tuning system.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] Different air permeability and different thickness of sound-tuning materials are used in different areas of the front and rear cavities of the planar acoustic transducer to control airflow exchange. This better balances the airflow in the front and rear cavities of the planar acoustic transducer, thereby improving the high-frequency or low-frequency response of the planar acoustic transducer.

[0013] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the principle of the zoned sound tuning method for the planar acoustic transducer involved in this invention. Figure 1 .

[0015] Figure 2 This is a schematic diagram illustrating the principle of the zoned sound tuning method for the planar acoustic transducer involved in this invention. Figure 2 .

[0016] Figure 3 This is a schematic diagram of the regional tuning structure of the planar acoustic transducer involved in this invention. Figure 1.

[0017] Figure 4 This is a schematic diagram of the regional tuning structure of the planar acoustic transducer involved in this invention. Figure 2 . Detailed Implementation

[0018] The principle of the regional tuning method for planar acoustic transducers involved in this invention is as follows: Figure 1 and Figure 2 As shown, a forward center tuning area 11 corresponding to the middle region of the diaphragm and a forward peripheral tuning area 12 corresponding to the peripheral region of the diaphragm are defined on the front cavity end face of the planar acoustic transducer. One or more layers of tuning materials with different air permeability and thickness are applied to the forward center tuning area 11 and the forward peripheral tuning area 12 respectively to construct a forward tuning system.

[0019] A rearward center tuning zone 21 corresponding to the central region of the diaphragm and a rearward peripheral tuning zone 22 corresponding to the peripheral region of the diaphragm are defined on the rear cavity end face of the flat panel acoustic transducer. One or more layers of tuning materials with different air permeability and thickness are applied to the rearward center tuning zone 21 and the rearward peripheral tuning zone 22 respectively to construct a rearward tuning system.

[0020] In a preferred embodiment, such as Figure 1 As shown, the forward center tuning area 11 is set as a rectangular area inscribed within the circular outline of the diaphragm, and the forward peripheral tuning area 12 is set as a circular area formed by the circular outline of the diaphragm being tangent to the forward center tuning area 11; as Figure 2 As shown, the rearward center tuning area 21 is set as a rectangular area inscribed within the circular outline of the diaphragm, and the rearward peripheral tuning area 22 is set as a circular area formed by the circular outline of the diaphragm being tangent to the rearward center tuning area 21.

[0021] Optionally, the forward peripheral tuning zone 12 and the rear peripheral tuning zone 22 may apply the same or different tuning materials to each of their respective circular regions. The purpose is that, depending on the diaphragm material and magnetic flux density, the planar acoustic transducer can achieve the desired high-frequency and low-frequency response performance through the combination of tuning materials, thereby realizing the expected tuning effect.

[0022] The regional tuning structure of the planar acoustic transducer involved in this invention is as follows: Figures 1 to 4As shown, a planar acoustic transducer 30 is provided. A forward center tuning area 11 corresponding to the central region of the diaphragm and a forward peripheral tuning area 12 corresponding to the peripheral region of the diaphragm are defined on the front cavity end cap of the planar acoustic transducer 30. The forward center tuning area 11 is a rectangular region inscribed within the circular outline of the diaphragm, and the forward peripheral tuning area 12 is a circular region formed by the tangent of the circular outline of the diaphragm to the forward center tuning area 11. One or more layers of tuning materials with different air permeability and thickness are applied to the forward center tuning area 11 and the forward peripheral tuning area 12 to construct a forward tuning system.

[0023] On the rear cavity end cap of the flat panel acoustic transducer 30, a rearward center tuning area 21 corresponding to the central region of the diaphragm and a rearward peripheral tuning area 22 corresponding to the peripheral region of the diaphragm are defined. The rearward center tuning area 21 is set as a rectangular area inscribed within the circular outline of the diaphragm, and the rearward peripheral tuning area 22 is set as a circular area formed by the circular outline of the diaphragm being tangent to the rearward center tuning area 21. One or more layers of tuning materials with different air permeability and thickness are applied to the rearward center tuning area 21 and the rearward peripheral tuning area 22 respectively to construct a rearward tuning system.

[0024] The aforementioned regional tuning structure of the planar acoustic transducer 30 uses different air permeability and different thicknesses of tuning materials in different areas of the front and rear cavities of the planar acoustic transducer 30 to control airflow exchange. This better balances airflow in the front and rear cavities of the planar acoustic transducer 30, thereby improving the high-frequency or low-frequency response of the planar acoustic transducer 30.

[0025] In a preferred embodiment, the forward tuning system sequentially applies a forward center zone adhesive tuning cloth 41 and a forward adhesive tuning cloth 42 to the front cavity end cap of the flat panel acoustic transducer 30. The forward center zone tuning cloth covers the forward center tuning area 11 by means of adhesive bonding, and the forward adhesive tuning cloth 42 covers the forward center zone adhesive tuning cloth 41 and the forward peripheral tuning area 12 by means of adhesive bonding.

[0026] As an example, both the front center zone adhesive-backed tuning cloth 41 and the front adhesive-backed tuning cloth 42 use medium-density tuning cloth, which serves to balance the high and mid frequencies in the front tuning system.

[0027] In a preferred embodiment, the rearward tuning system is sequentially applied to the rear cavity end cap of the flat panel acoustic transducer 30, consisting of a rearward hollow adhesive-backed tuning cloth 51, a rearward adhesive-backed mesh 52, a first rearward adhesive-backed tuning cloth 53, and a second rearward adhesive-backed tuning cloth 54. The rearward hollow adhesive-backed tuning cloth 51 covers the rearward peripheral tuning area 22 through adhesive bonding. The rearward adhesive-backed mesh 52 covers the rearward central tuning area 21 and the rearward hollow adhesive-backed tuning cloth 51 through adhesive bonding. The first rearward adhesive-backed tuning cloth 53 covers the rearward adhesive-backed mesh 52 through adhesive bonding. The second rearward adhesive-backed tuning cloth 54 covers the first rearward adhesive-backed tuning cloth 53 through adhesive bonding.

[0028] The exemplary 51 series of back-adhesive tuning cloth and the 52 series of back-adhesive mesh fabrics create a high-frequency trap in the back-tuning system, thereby achieving the effects of low-frequency boosting and mid-frequency suppression in the back-tuning system.

[0029] As an example, the density and thickness of the first rear-adhesive tuning cloth 53 and the second rear-adhesive tuning cloth 54 are different. The purpose is that, according to different diaphragm materials and magnetic flux densities, the planar acoustic transducer 30 can obtain the desired high-frequency response and low-frequency response performance by matching the tuning materials, thereby achieving the expected tuning effect.

[0030] For those skilled in the art, the scope of protection of this invention is not limited to the details of the above exemplary embodiments. Without departing from the spirit or essential characteristics of this invention, all equivalent and varied implementations made by those skilled in the art based on the elements of this invention should be included within this invention.

Claims

1. A method for regional tuning of a flat-panel acoustic transducer, characterized in that: A forward center tuning zone corresponding to the central region of the diaphragm and a forward peripheral tuning zone corresponding to the peripheral region of the diaphragm are defined on the front cavity end face of the planar acoustic transducer. One or more layers of tuning materials with different air permeability and thickness are applied to the forward center tuning zone and the forward peripheral tuning zone to construct a forward tuning system. The forward tuning system includes a forward center adhesive-backed tuning cloth and a forward adhesive-backed tuning cloth applied sequentially to the front cavity end cover of the planar acoustic transducer. The forward center tuning cloth covers the forward center tuning zone by adhesive bonding. The forward adhesive-backed tuning cloth covers the forward center adhesive-backed tuning cloth and the forward peripheral tuning zone by adhesive bonding. A rearward center tuning zone corresponding to the central region of the diaphragm and a rearward peripheral tuning zone corresponding to the peripheral region of the diaphragm are defined on the rear cavity end face of the planar acoustic transducer. One or more layers of tuning materials with different air permeability and thickness are applied to the rearward center tuning zone and the rearward peripheral tuning zone to construct a rearward tuning system. The rearward tuning system includes a rearward hollow adhesive-backed tuning cloth, a rearward adhesive-backed mesh, a first rearward adhesive-backed tuning cloth, and a second rearward adhesive-backed tuning cloth, which are applied sequentially to the rear cavity end cover of the planar acoustic transducer. The rearward hollow adhesive-backed tuning cloth covers the rearward peripheral tuning zone by adhesive bonding. The rearward adhesive-backed mesh covers the rearward center tuning zone and the rearward hollow adhesive-backed tuning cloth by adhesive bonding. The first rearward adhesive-backed tuning cloth covers the rearward adhesive-backed mesh by adhesive bonding. The second rearward adhesive-backed tuning cloth covers the first rearward adhesive-backed tuning cloth by adhesive bonding.

2. The method for regional tuning of a planar acoustic transducer as described in claim 1, characterized in that: The forward center tuning area is set as a rectangular region inscribed within the circular outline of the diaphragm, and the forward peripheral tuning area is set as a circular region formed by the tangent of the circular outline of the diaphragm to the forward center tuning area; the rear center tuning area is set as a rectangular region inscribed within the circular outline of the diaphragm, and the rear peripheral tuning area is set as a circular region formed by the tangent of the circular outline of the diaphragm to the rear center tuning area.

3. The method for regional tuning of a planar acoustic transducer as described in claim 2, characterized in that: The forward and rear peripheral tuning zones apply the same tuning material to each of the cut-circle areas.

4. The method for regional tuning of a planar acoustic transducer as described in claim 2, characterized in that: The forward and rear peripheral tuning zones apply different tuning materials to each of the cut-circle areas.

5. A zoned tuning structure for a planar acoustic transducer, comprising a planar acoustic transducer, characterized in that: On the front cavity end cap of the flat panel acoustic transducer, a forward center tuning area corresponding to the central region of the diaphragm and a forward peripheral tuning area corresponding to the peripheral region of the diaphragm are defined. The forward center tuning area is set as a rectangular area inscribed within the circular outline of the diaphragm, and the forward peripheral tuning area is set as a circumscribed area formed by the circular outline of the diaphragm being tangent to the forward center tuning area. One or more layers of tuning materials with different air permeability and thickness are applied to the forward center tuning area and the forward peripheral tuning area to construct a forward tuning system. The forward tuning system includes a forward center area adhesive-backed tuning cloth and a forward adhesive-backed tuning cloth applied sequentially to the front cavity end cap of the flat panel acoustic transducer. The forward center area tuning cloth covers the forward center tuning area by adhesive bonding, and the forward adhesive-backed tuning cloth covers the forward center area adhesive-backed tuning cloth and the forward peripheral tuning area by adhesive bonding. On the rear end cap of the planar acoustic transducer, a rearward center tuning zone corresponding to the central region of the diaphragm and a rearward peripheral tuning zone corresponding to the peripheral region of the diaphragm are defined. The rearward center tuning zone is a rectangular area inscribed within the circular outline of the diaphragm, and the rearward peripheral tuning zone is a circumscribed area formed by the circular outline of the diaphragm being tangent to the rearward center tuning zone. One or more layers of tuning materials with different air permeability and thickness are applied to the rearward center tuning zone and the rearward peripheral tuning zone respectively to construct a rearward tuning system. The system includes a rearward hollow adhesive-backed tuning cloth, a rearward adhesive-backed mesh, a first rearward adhesive-backed tuning cloth, and a second rearward adhesive-backed tuning cloth, which are sequentially applied to the rear cavity end cap of the flat panel acoustic transducer. The rearward hollow adhesive-backed tuning cloth covers the rearward peripheral tuning area through an adhesive bonding method. The rearward adhesive-backed mesh covers the rearward center tuning area and the rearward hollow adhesive-backed tuning cloth through an adhesive bonding method. The first rearward adhesive-backed tuning cloth covers the rearward adhesive-backed mesh through an adhesive bonding method. The second rearward adhesive-backed tuning cloth covers the first rearward adhesive-backed tuning cloth through an adhesive bonding method.

6. The zoned tuning structure of the planar acoustic transducer as described in claim 5, characterized in that: Both the front center area adhesive-backed tuning cloth and the front adhesive-backed tuning cloth use medium-density tuning cloth.

7. The zoned tuning structure of the planar acoustic transducer as described in claim 5, characterized in that: The rearward-curved hollow adhesive-backed tuning cloth is a low-density tuning cloth. The rearward-curved adhesive-backed mesh is a high-breathable, low-density mesh that creates a high-frequency trap in the rearward tuning system.

8. The zoned tuning structure of the planar acoustic transducer as described in claim 5, characterized in that: The density and thickness of the first and second rear-adhesive tuning cloths are different.

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