Diaphragm, and electroacoustic transducer

Abstract

To provide a diaphragm capable of suppressing split resonance.SOLUTION: A diaphragm 100 is a diaphragm provided to an electroacoustic transducer. The diaphragm 100 extends spirally from the center of the diaphragm 100 or the vicinity to the outer periphery. The diaphragm 100 includes: a first projection 111 protruding from at least one of surface 101 and back surface 102 of diaphragm 100; and a second projection 112 that extends from the center of diaphragm 100 or its vicinity to the periphery in a spiral in the opposite direction to the first projection 111, and protrudes from at least one of the surface 101 and the back surface 102, intersecting with the first projection 111.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a diaphragm and an electro-acoustic transducer including the diaphragm. [Background technology]

[0002] Conventionally, as described in Patent Documents 1-4, there have been diaphragms for speakers, which are a type of electroacoustic transducer, that have reinforcing ribs, such as a spiral or hexagonal cluster, formed thereon to improve the structural strength of the diaphragm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4793018 [Patent Document 2] Japanese Utility Model Application Publication No. 60-181987 [Patent Document 3] Patent Publication No. 2021-044685 [Patent Document 4] Japanese Patent Application Publication No. 11-215589 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional reinforcing rib pattern, the surface area of ​​the diaphragm divided by the reinforcing ribs is equal to that of the other parts, resulting in split resonance, which causes the flatness of the frequency response to be lost.

[0005] The present disclosure aims to provide a diaphragm having a reinforcing rib pattern that is an improvement over conventional diaphragms and can more effectively suppress split resonance, and an electro-acoustic transducer equipped with such a diaphragm. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one aspect of the present invention is a diaphragm provided in an electro-acoustic transducer, the diaphragm comprising: a first protrusion streak extending spirally from or near the center of the diaphragm toward the periphery and protruding from at least one of the front and back surfaces of the diaphragm; and a second protrusion streak extending spirally from or near the center of the diaphragm toward the periphery in the opposite direction to the first protrusion streak, protruding from at least one of the front and back surfaces of the diaphragm and intersecting with the first protrusion streak.

[0007] In order to achieve the above-mentioned object, an electro-acoustic transducer according to the present disclosure comprises a diaphragm having a first protrusion streak that extends in a spiral shape from or near the center of the diaphragm toward the periphery and protrudes from at least one of the front and back surfaces of the diaphragm, and a second protrusion streak that extends in a spiral shape in an opposite direction to the first protrusion streak from or near the center of the diaphragm toward the periphery, protrudes from at least one of the front and back surfaces of the diaphragm and intersects with the first protrusion streak, a magnetic circuit, a frame that holds the magnetic circuit and the diaphragm, and a voice coil that is connected to the diaphragm and is disposed in a magnetic gap of the magnetic circuit. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a diaphragm and an electro-acoustic transducer that can more effectively suppress split resonance. [Brief description of the drawings]

[0009] [Figure 1] FIG. [Diagram 2] FIG. 4 is a rear view showing the diaphragm from the rear side. [Diagram 3] FIG. [Figure 4] 1 is a cross-sectional view of a speaker device equipped with a diaphragm. [Diagram 5] 1 is a diagram showing a difference in sound pressure frequency characteristics between a speaker device having a diaphragm of a conventional shape and a speaker device having a diaphragm of the present embodiment. [Figure 6]FIG. 11 is a rear view showing the diaphragm according to the first modified example from the rear side. [Figure 7] FIG. 11 is a rear view showing the second modification of the diaphragm from the rear side. [Figure 8] 1 is a cross-sectional view of an automobile, which is one example of a moving object to which a speaker device having a diaphragm is attached. [Figure 9] FIG. 1 is a diagram showing a mini component system, which is one type of electronic device to which a speaker device having a diaphragm is attached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a diaphragm and an electroacoustic transducer according to the present disclosure will be described with reference to the drawings. Note that the following embodiment is an example for explaining the present disclosure, and is not intended to limit the present disclosure. For example, the shapes, structures, materials, components, relative positional relationships, connection states, numerical values, mathematical expressions, contents of each step in the method, and the order of each step shown in the following embodiment are examples, and may include contents not described below. In addition, geometric expressions such as parallel and orthogonal may be used, but these expressions do not indicate mathematical strictness, and include substantially permissible errors, deviations, etc. In addition, expressions such as simultaneous and identical also include substantially permissible ranges.

[0011] In addition, the drawings are schematic diagrams in which emphasis, omission, or ratio adjustment is appropriately performed to explain the present disclosure, and are different from the actual shapes, positional relationships, and ratios. In addition, the X-axis, Y-axis, and Z-axis that may be shown in the drawings indicate orthogonal coordinates that are arbitrarily set for the explanation of the drawings. In other words, the Z-axis is not necessarily an axis along the vertical direction, and the X-axis and Y-axis are not necessarily present in a horizontal plane.

[0012] In addition, in the following, a plurality of inventions may be collectively described as one embodiment. In addition, some of the contents described below are described as optional components related to the present disclosure.

[0013] Fig. 1 is a plan view showing diaphragm 100 from the front surface 101 side. Fig. 2 is a rear view showing diaphragm 100 from the rear surface 102 side. Fig. 3 is a side view showing diaphragm 100 from the side. Note that in Fig. 2, a line is drawn on diaphragm 100 that virtually passes through center O, but this line appears in the drawing and does not appear on diaphragm 100 itself.

[0014] The diaphragm 100 is a member provided in an electroacoustic transducer such as a speaker device or a microphone, and is a member that vibrates itself to vibrate the air and generate sound, or vibrates itself based on the vibration of the air. The diaphragm 100 is provided with a first protrusion 111 and a second protrusion 112 that function as ribs that structurally reinforce the diaphragm 100 on at least one of a front surface 101 (the surface on the Z+ side in the figure) and a back surface 102 (the surface on the Z- side in the figure). The front surface 101 of the diaphragm 100 is the surface that emits or receives sound, and the back surface 102 is the surface opposite the front surface 101.

[0015] The first ridges 111 are ribs that extend in a spiral shape from the center O of the diaphragm 100 or its vicinity (in the present embodiment, its vicinity of the cone neck portion 120) toward the outer periphery, and protrude from at least one of the front surface 101 and the back surface 102 of the diaphragm 100. In the present embodiment, the first ridges 111 protrude from the back surface 102. When viewed from the back side, the first ridges 111 are wound in a spiral shape clockwise when viewed from the center O toward the outer periphery. The number of first ridges 111 provided on the diaphragm 100 is not limited, but is preferably selected from the Fibonacci sequence. The multiple first ridges 111 are evenly arranged in the circumferential direction. In the present embodiment, the diaphragm 100 includes thirteen first ridges 111. The spiral shape of the first ridges 111 is not limited, but in the present embodiment, the first ridges 111 form a golden spiral in a plan view from the back surface 102 side. The height of first ridges 111 is not limited, but in this embodiment, the height of first ridges 111 is greater than the thickness of diaphragm 100 in the portion where no ridges are provided.

[0016] The second ridges 112 extend in a spiral shape in the opposite direction to the first ridges 111 from the center O of the diaphragm 100 or its vicinity (in the present embodiment, its vicinity is the cone neck portion 120) toward the outer periphery, and intersect with the first ridges 111. The second ridges 112 are ribs protruding from at least one of the front surface 101 and the back surface 102 of the diaphragm 100. In the present embodiment, the second ridges 112 protrude from the back surface 102, similar to the first ridges 111. The second ridges 112 wind in a spiral shape counterclockwise when moving from the center O toward the outer periphery as viewed from the back side. The number of the second ridges 112 provided on the diaphragm 100 is not limited, but is preferably selected from the Fibonacci sequence, unlike the number of the first ridges 111. The multiple second ridges 112 are evenly arranged in the circumferential direction. In the present embodiment, the diaphragm 100 includes eight second ridges 112. The spiral shape of second ridges 112 is not limited, but in the present embodiment, second ridges 112 form a golden spiral similar to first ridges 111 in a plan view seen from back surface 102. The height of first ridges 111 is not limited, but in the present embodiment, second ridges 112 have a height approximately the same as that of first ridges 111 and are greater than the thickness of diaphragm 100 in portions where no ridges are provided.

[0017] In this embodiment, the vibration plate 100 has a plurality of portions surrounded by two adjacent first ridges 111 and two adjacent second ridges 112, but the areas of the plurality of surrounded portions are different from one another.

[0018] The shape of the diaphragm 100 is not limited. In the present embodiment, the diaphragm 100 has a circular cone shape in a plan view. A through hole 121 connected to a voice coil 231 (described later) is provided in the center of the diaphragm 100. The diaphragm 100 includes a cylindrical cone neck portion 120 on the periphery of the through hole 121 for strengthening the connection with the voice coil 231.

[0019] The material constituting the diaphragm 100 is not limited. For example, the diaphragm 100 may be formed by papermaking at least one of chemical fibers such as polyester fibers and pulp, or may be formed from a resin kneaded with a reinforcing material or a resin kneaded with hollow glass. The diaphragm 100 is molded integrally with the first ridges 111 and the second ridges 112.

[0020] Fig. 4 is a cross-sectional view of a speaker device 200, which is one type of electroacoustic transducer equipped with a diaphragm 100. Note that the first ridges 111 and the second ridges 112 are omitted from Fig. 4. As shown in Fig. 4, the speaker device 200 includes the diaphragm 100, a magnetic circuit 210, a frame 220 that holds the magnetic circuit 210 and the diaphragm 100, and a voice coil 231 that is connected to the diaphragm 100 and disposed in a magnetic gap of the magnetic circuit 210.

[0021] In the case of this embodiment, the magnetic circuit 210 provided in the speaker device 200 is an internal magnet type magnetic circuit 210 formed by sandwiching a magnetized magnet 211 between an upper plate 212 and a yoke 213 .

[0022] The yoke 213 of the magnetic circuit 210 is coupled to the frame 220. An annular edge 240 is attached to the peripheral portion 221 of the frame 220, connecting the outer peripheral portion of the diaphragm 100 and the frame 220. The center of the diaphragm 100 is coupled to one end of the voice coil body 230. The other end of the voice coil body 230 is disposed so as to fit into the magnetic gap 215 of the magnetic circuit 210. In the present embodiment, the voice coil body 230 is exemplified as having the voice coil 231 and the bobbin 232 around which the voice coil 231 is wound, but the voice coil body 230 may not have the bobbin 232. The bobbin 232 of the voice coil body 130 is supported by an annular damper 160 that connects the frame 220 and the voice coil body 232 in a bridging manner.

[0023] Although the speaker device 200 having the internal magnet type magnetic circuit 210 has been described, the present invention is not limited to this, and the diaphragm 100 may be applied to the speaker device 200 having the external magnet type magnetic circuit 210 .

[0024] Fig. 5 is a diagram showing the difference in sound pressure frequency characteristics between a speaker device equipped with a diaphragm 100 of a conventional shape and a speaker device 200 equipped with the diaphragm 100 of this embodiment. As shown in Fig. 5, the diaphragm 100 has an improved overall sound pressure compared to the conventional diaphragm. Also, compared to the conventional diaphragm, the shoulder portion where the sound pressure decreases toward higher frequencies is shifted to the higher frequency side, thereby achieving a wider bandwidth. Also, split resonance occurring in the high frequency band is suppressed compared to the conventional diaphragm.

[0025] According to the speaker device 200 of this embodiment, it is possible to obtain a speaker device that effectively suppresses split resonance that occurs by dividing the diaphragm 100 by ribs (projections). In addition, it is possible to extend the high-frequency limit frequency of the speaker device, and it is possible to realize high-fidelity reproduction and high-clarity sound quality.

[0026] The present invention is not limited to the above-described embodiment. For example, the components described in this specification may be combined in any manner, or some of the components may be removed to create another embodiment of the present invention. In addition, the present invention also includes modifications that are made to the above-described embodiment by those skilled in the art without departing from the spirit of the present invention, i.e., the meaning of the words in the claims.

[0027] For example, in multiple portions of the vibration plate 100 surrounded by adjacent first protrusions 111 and adjacent second protrusions 112, the thickness of an arbitrarily specified first portion may be different from the thickness of a second portion different from the first portion.

[0028] The first portion may be disposed at or near the center of diaphragm 100, and the second portion may be disposed at the outer periphery of diaphragm 100. Specifically, as shown in Fig. 6, the inside of a circular imaginary boundary line 300 and the portion intersecting with the imaginary boundary line may be defined as the first portion, and the other portion (outside imaginary boundary line 300) may be defined as the second portion, and the first portion and the second portion may have different thicknesses.

[0029] 7, the numbers of the first ridges 111 and the second ridges 112 may be 21 and 13 (both selected from the Fibonacci sequence), etc. Furthermore, the number of first ridges 111 and the second ridges 112 may be fewer than the number of second ridges 112.

[0030] Also, while the first protrusion ridges 111 and the second protrusion ridges 112 have been described as solid ribs, the first protrusion ridges 111 and the second protrusion ridges 112 may be grooves that protrude from at least one of the front surface 101 and the back surface 102. In other words, the first protrusion ridges 111 and the second protrusion ridges 112 may be hollow grooves (wrinkles) that protrude from at least one of the front surface 101 and the back surface 102 and are recessed from the other surface.

[0031] Moreover, the electroacoustic transducer having the diaphragm 100 may be provided in a moving object. Fig. 8 is a cross-sectional view of an automobile 310, which is one of the moving objects to which a speaker device 200 having the diaphragm 100 is attached. The automobile 310 has the speaker device 200 having the diaphragm 100 on the front panel, pillars, doors, etc., as well as on the rear tray. The speaker device 200 is used as a part of a car navigation system or a car audio system. The automobile 310 has a driving means 311, and moves the speaker device 200 together with a vehicle body 312 that functions as a housing for accommodating the speaker device 200.

[0032] Moreover, the speaker device 200 including the diaphragm 100 may be provided in an electronic device as shown in Fig. 9. Fig. 9 is a diagram showing another example of use of the speaker device 200 including the diaphragm 100. An audio mini component system 320 will be exemplified and described as one of the electronic devices including the speaker device 200 including the diaphragm 100.

[0033] The mini component system 320 has two speaker devices 200 built in each of two enclosures 321. The mini component system 320 also includes an amplifier 322 including an amplifier circuit for an electric signal input to the speaker device 200, a tuner 323 for outputting a source input to the amplifier 322, and a CD player 324. The mini component system 320, which is an audio mini component system, amplifies a music signal input from the tuner 323 or the CD player 324 by the amplifier 322, and emits sound from the speaker device 200 based on the amplified signal. In addition to the mini component system 320, examples of electronic devices include an audio system for an automobile, a portable audio device, video equipment such as a liquid crystal television or an organic EL display television, information and communication equipment such as a mobile phone, and computer-related equipment.

[0034] The diaphragm 100 of the first aspect of the embodiment is a diaphragm 100 provided in an electro-acoustic transducer, and the diaphragm 100 is provided with a first protrusion 111 that extends in a spiral shape from the center of the diaphragm 100 or its vicinity toward the outer periphery and protrudes from at least one of the front surface 101 and the back surface 102 of the diaphragm 100, and a second protrusion 112 that extends in a spiral shape in the opposite direction to the first protrusion 111 from the center of the diaphragm 100 or its vicinity toward the outer periphery, protrudes from at least one of the front surface 101 and the back surface 102 of the diaphragm 100, and intersects with the first protrusion 111.

[0035] According to the diaphragm 100 of the first embodiment, the diaphragm 100 is structurally strengthened by providing a plurality of ridges, thereby improving the sound pressure and effectively suppressing split resonance.

[0036] Diaphragm 100 of the second embodiment includes diaphragm 100 of the first embodiment, and has a plurality of first ridges 111 and a plurality of second ridges 112, but the number of first ridges 111 and the number of second ridges 112 are different.

[0037] According to the diaphragm 100 of the second embodiment, split resonance can be suppressed more effectively.

[0038] The diaphragm 100 of the third embodiment includes the diaphragm 100 of the second embodiment, and the numbers of the first ridges 111 and the second ridges 112 are selected from the Fibonacci sequence.

[0039] This makes it possible to easily make the areas of the portions enclosed by adjacent first ridges 111 and adjacent second ridges 112 different from each other, thereby suppressing split resonance.

[0040] Diaphragm 100 of the fourth embodiment includes the first embodiment and the second embodiment, and the areas of the portions surrounded by first ridges 111 and second ridges 112 are different from each other.

[0041] According to the diaphragm 100 of the fourth embodiment, split resonance can be suppressed.

[0042] Diaphragm 100 of the fifth embodiment includes any of the first to fourth embodiments, and has a different thickness between a first portion surrounded by first ridges 111 and second ridges 112 and a second portion different from the first portion.

[0043] The diaphragm 100 of the sixth embodiment includes the diaphragm 100 of the fifth embodiment, in which the first portion is disposed at or near the center of the diaphragm 100 and the second portion is disposed at the outer periphery of the diaphragm 100 .

[0044] According to the diaphragm 100 of the fifth and sixth aspects, the structural strength of the diaphragm 100 can be partially changed, and the sound pressure frequency characteristics can be adjusted as desired.

[0045] The diaphragm 100 of the seventh embodiment includes the diaphragm 100 of the sixth embodiment, and the thickness of the first portion is greater than the thickness of the second portion.

[0046] According to the diaphragm 100 of the seventh embodiment, an even greater effect can be achieved.

[0047] Diaphragm 100 of the eighth embodiment includes any of the first to seventh embodiments, and at least one of first ridges 111 and second ridges 112 extends in a golden spiral shape.

[0048] According to the diaphragm 100 of the eighth embodiment, the design can be improved.

[0049] The diaphragm 100 of the ninth embodiment includes any one of the first to seventh embodiments, and is made of resin.

[0050] The diaphragm 100 of the tenth embodiment includes any of the first to seventh embodiments, and is formed from a resin in which hollow glass is kneaded.

[0051] The electro-acoustic transducer of the eleventh embodiment comprises a diaphragm 100 of any one of the first to tenth embodiments, a magnetic circuit 210, a frame 220 that holds the magnetic circuit 210 and the diaphragm 100, and a voice coil 231 that is connected to the diaphragm 100 and positioned in a magnetic gap 215 of the magnetic circuit 210.

[0052] According to the electroacoustic transducer of the eleventh aspect, split resonance can be effectively suppressed. [Industrial Applicability]

[0053] The diaphragm and electroacoustic transducer according to the present disclosure can be applied to electronic devices such as audiovisual devices and information and communication devices, and mobile objects such as automobiles. [Explanation of symbols]

[0054] 100 diaphragm 101 Surface 102 Back side 111 First protrusion 112 Second protrusion 120 Cone neck part 121 Through hole 160 Damper 200 Speaker equipment 210 Magnetic Circuit 211 Magnet 212 Upper Plate 213 York 215 Magnetic Gap 220 frames 221 Periphery 230 Voice coil body 231 Voice coil 232 Bobbin 240 Edge 300 Virtual Boundary 310 Automobiles 311 Driving means 312 Body 320 Mini component system 321 Enclosure 322 Amplifier 323 Tuner 324 Player

Claims

1. A diaphragm provided in an electroacoustic transducer, The diaphragm is a first protrusion extending in a spiral shape from a center or a vicinity thereof toward an outer periphery of the diaphragm and protruding from at least one of a front surface and a back surface of the diaphragm; a second ridge extending in a spiral shape in a direction opposite to that of the first ridge from the center or a vicinity thereof of the diaphragm toward the outer periphery, protruding from at least one of the front surface and the back surface of the diaphragm and intersecting with the first ridge; A diaphragm comprising:

2. The diaphragm is The first ridges and the second ridges are each provided in a plurality of pieces, The number of the first ridges is different from the number of the second ridges. The diaphragm according to claim 1 .

3. The number of the first ridges and the second ridges is selected from the Fibonacci sequence. The diaphragm according to claim 2 .

4. The areas of the portions surrounded by the first ridges and the second ridges are different from each other. The diaphragm according to claim 1 or 2.

5. A first portion surrounded by the first ridge and the second ridge has a different thickness from a second portion different from the first portion. The diaphragm according to claim 1 or 2.

6. The first portion is disposed at or near a center of the diaphragm, and the second portion is disposed at a peripheral portion of the diaphragm. The diaphragm according to claim 5 .

7. The thickness of the first portion is greater than the thickness of the second portion. The diaphragm according to claim 6.

8. At least one of the first ridge and the second ridge extends in a golden spiral shape. The diaphragm according to claim 1 or 2.

9. The diaphragm is Formed from resin The diaphragm according to claim 1 or 2.

10. The diaphragm is Hollow glass is formed by kneading resin The diaphragm according to claim 1 or 2.

11. A diaphragm according to claim 1 or 2; A magnetic circuit; a frame for holding the magnetic circuit and the diaphragm; a voice coil connected to the diaphragm and disposed in a magnetic gap of the magnetic circuit.

Images