Sub-diaphragm and speaker

Abstract

To improve a high sound characteristic of a speaker.SOLUTION: A sub diaphragm 150 is the sub diaphragm 150 used for a speaker 100, and comprises: an inclination part 152 in which an open area is increased toward a discharge direction of a sound of the speaker 100; and an annular edge part 153 that linearly extends toward an outer side along a direction orthogonal to the discharge direction from a tip end edge of the inclination part 152.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a sub-diaphragm used in various audio equipment, video equipment, etc., and a speaker using the same. [Background technology]

[0002] As described in Patent Document 1, there is a conventional speaker in which a sub-diaphragm is arranged in the center of the diaphragm. This sub-diaphragm is a component that can assist in high-frequency reproduction and plays a role in extending the high-frequency frequency characteristics of the speaker. The sub-diaphragm also functions as a dust cap that seals the voice coil body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 1-057885 Summary of the Invention [Problem to be solved by the invention]

[0004] However, speakers equipped with conventional sub-diaphragms have the problem that their high-frequency characteristics gradually deteriorate until they reach the upper limit of the audible range.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a sub-diaphragm that can suppress a decrease in the high-frequency characteristics of the sound pressure frequency characteristics, and a speaker that includes the sub-diaphragm. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present disclosure is a sub-diaphragm used in a speaker, which includes an inclined portion whose opening area increases in the direction in which sound is emitted from the speaker, and an annular edge portion that extends linearly outward from the tip edge of the inclined portion in a direction perpendicular to the emission direction.

[0007] Furthermore, in order to achieve the above object, the speaker according to the present disclosure comprises a main diaphragm, a magnetic circuit, a frame that holds the magnetic circuit and the main diaphragm, a voice coil body that has one end connected to the main speaker diaphragm and the other end located in the magnetic gap of the magnetic circuit, and a sub-diaphragm that is located in front of the main diaphragm in the sound emission direction, and the sub-diaphragm comprises an inclined portion whose opening area increases toward the emission direction, and an annular edge portion that extends linearly from the tip edge of the inclined portion toward the outside in a direction that intersects the emission direction. [Effects of the Invention]

[0008] The configuration of the present disclosure can improve the sound pressure frequency characteristics of a speaker. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view showing a cross section of a speaker according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view showing a sub-diaphragm according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a plan view showing a main diaphragm and a sub diaphragm according to the embodiment. [Figure 4] 1 is a diagram illustrating an external appearance of an electronic device including a speaker according to an embodiment. [Figure 5] 1 is a cross-sectional view showing a moving object equipped with a speaker according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Next, embodiments of a sub-diaphragm and a speaker according to the present disclosure will be described with reference to the drawings. Note that the following embodiments merely illustrate examples of a sub-diaphragm and a speaker according to the present disclosure. Therefore, the scope of the present disclosure is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments. Therefore, among the components in the following embodiments, components that are not recited in the independent claims that represent the superordinate concept of the present disclosure are not necessarily required to achieve the object of the present disclosure, but are described as constituting more preferred embodiments.

[0011] Furthermore, the drawings are schematic diagrams in which emphasis, omissions, and proportions have been appropriately adjusted in order to illustrate the present disclosure, and may differ from the actual shapes, positional relationships, and proportions.

[0012] Fig. 1 is a cross-sectional view showing a cross section of a speaker according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view showing a sub-diaphragm according to an embodiment of the present disclosure. Fig. 3 is a plan view showing a main diaphragm and a sub-diaphragm according to the embodiment. Speaker 100 is an electro-acoustic transducer that converts an input electrical signal into sound, and includes main diaphragm 110, a magnetic circuit 120, a frame 130, a voice coil body 140, and a sub-diaphragm 150. In this embodiment, speaker 100 includes a damper 160.

[0013] Main diaphragm 110 is a plate-like or film-like member that vibrates in response to the reciprocating motion of voice coil body 140 (in the Z-axis direction in the drawing) to generate sound. The shape of main diaphragm 110 is not particularly limited, but in this embodiment it is a truncated cone shape, or so-called cone shape. Main diaphragm 110 is disposed so that its diameter widens in the sound emission direction (Z+ direction in the drawing), with the end on the larger diameter side connected to frame 130 via edge 111 and the end on the smaller diameter side connected to the outer peripheral surface of voice coil body 140.

[0014] The magnetic circuit 120 comprises a cylindrical magnet 121 which is a magnetized permanent magnet, a disk-shaped plate 122 attached to the top of the magnet 121, and a cylindrical yoke 123 with a bottom that houses the magnet 121 and the plate 122, and forms a circular magnetic gap 102 between the plate 122 and the yoke 123.

[0015] Frame 130 is a structural member that holds magnetic circuit 120 and main diaphragm 110. The shape of frame 130 is not particularly limited, but in this embodiment, it is funnel-shaped when viewed from the outside. The outer periphery of main diaphragm 110 is located in a position surrounded by the upper periphery of frame 130, and frame 130 and main diaphragm 110 are bonded together via annular edge 111.

[0016] Voice coil body 140 includes cylindrical bobbin 141 and coil 142 wound around the outer periphery of bobbin 141. One end is connected to the center of main diaphragm 110, and the other end is disposed so as to fit into magnetic gap 102 of magnetic circuit 120. Voice coil body 140 is supported by damper 160, which connects frame 130 and voice coil body 140 in a bridging manner.

[0017] Sub-diaphragm 150 is a cone-shaped component located in front of main diaphragm 110 in the sound emission direction (Z+ direction in the figure), and is attached to the tip of voice coil body 140 in order to improve the high-frequency characteristics of speaker 100. In this embodiment, sub-diaphragm 150 includes sealing portion 151 that seals voice coil body 140. Sealing portion 151 is dome-shaped and bulges in the emission direction, and a portion of sealing portion 151 is provided with recessed portion 154 that is recessed in the dome shape toward the opposite side of the emission direction (Z- direction in the figure). Recessed portion 154 is provided to facilitate the easy removal of stacked sub-diaphragms 150 one by one during the manufacture of speaker 100. Sub-diaphragm 150 is connected to the inner circumferential surface of the tip of voice coil body 140 with an adhesive or the like.

[0018] As shown in FIG. 2 , sub-diaphragm 150 includes inclined portion 152 whose opening area increases toward the sound emission direction of speaker 100 (Z+ direction in the figure), and annular edge portion 153 that linearly extends outward from the leading edge of inclined portion 152 in a direction perpendicular to the sound emission direction (within the XY plane in the figure). "Linearly extending" means that when cut along a plane including the sound emission direction, edge portion 153 has a straight cross section. By providing edge portion 153 that extends in a plane, sub-diaphragm 150 can improve the structural rigidity of sub-diaphragm 150 and reduce the overall weight of sub-diaphragm 150. This increases the micro-amplitude of sub-diaphragm 150, thereby suppressing the tendency of speakers with conventional sub-diaphragms to gradually lose characteristics before reaching the 20 kHz audible range. In other words, sub-diaphragm 150 can enhance the high-frequency characteristics of speaker 100.

[0019] Sealing portion 151, inclined portion 152, and edge portion 153 of sub-diaphragm 150 are integrally formed. Between inclined portion 152 and edge portion 153 of sub-diaphragm 150, bent portion 155 is formed, which is bent to the extent that a clearly distinguishable ridgeline is formed. Edge portion 153, which is located beyond bent portion 155, is flat or has a nearly flat annular shape. In the radial direction from the winding axis of coil 142, length L from bent portion 155 to the tip of edge portion 153 is preferably within a range of 1 mm to 8 mm, or 1% to 20% of maximum diameter D of inclined portion 152. If length L of edge portion 153 is less than 1 mm or less than 1% of maximum diameter D, the structural rigidity of sub-diaphragm 150 cannot be effectively improved, and the high-frequency characteristics of speaker 100 cannot be improved. Furthermore, if the length L of the edge portion 153 is greater than 8 mm or greater than 20% of the maximum diameter D, the weight of the sub-diaphragm 150 increases, which is thought to cause unnecessary resonance and adversely affect the characteristics of the speaker 100.

[0020] Edge portion 153 may be denser than inclined portion 152. By making edge portion 153 denser than other portions, the rigidity of edge portion 153 can be increased, and the structural rigidity of the entire sub-diaphragm 150 can be improved without significantly increasing the weight of sub-diaphragm 150. There is no limitation on the method for densifying edge portion 153, but edge portion 153 may be compressed more strongly than other portions such as inclined portion 152 to reduce its thickness and thereby achieve high density. Furthermore, if sub-diaphragm 150 is made of paper, edge portion 153 may be impregnated with or coated with a hardening agent to increase its density and strength.

[0021] The shape of inclined portion 152 is not limited to any particular shape, and may be a truncated cone shape in which the opening area increases with increasing distance from main diaphragm 110. In the present embodiment, inclined portion 152 is curved so as to bulge inward, and the radius of curvature of the tip end of inclined portion 152 in the emission direction is longer than the radius of curvature of the base end. In other words, inclined portion 152 is curved with multiple curvatures. Specifically, the radius of curvature of the tip end of inclined portion 152 is 10 times or more the radius of curvature of the base end.

[0022] The material constituting main diaphragm 110 and sub-diaphragm 150 is not particularly limited, and examples include paper, resin, metal, etc. Furthermore, the materials constituting main diaphragm 110 and sub-diaphragm 150 may be the same or different.

[0023] Next, a first application example of the speaker 100 will be described. Fig. 4 is a diagram showing the appearance of an electronic device that is the first application example of the speaker. An audio mini component system will be exemplified as an electronic device 200 that includes the speaker 100 and will be described.

[0024] The electronic device 200 includes a speaker system 203 on each side, in which the speaker 100 and a woofer 202 are incorporated in an enclosure 201 .

[0025] The electronic device 200 also includes an amplifier 204 including an amplifier circuit for amplifying the electrical signal input to the speaker system 203 , a tuner 205 for outputting the source input to the amplifier 204 , and a CD player 206 .

[0026] Electronic device 200, which is an audio mini component system, amplifies music signals input from tuner 205 and CD player 206 using amplifier 204, and emits sound from speaker 100 and woofer 202 provided in speaker system 203. Specifically, in speaker 100, dynamic magnetic force generated by an electrical signal input to voice coil body 140 interacts with static magnetic force generated in magnetic gap 102 of magnetic circuit 120, causing voice coil body 140 to vibrate relative to frame 130, and the vibrations are transmitted to main diaphragm 110 and sub-diaphragm 150, causing them to vibrate and produce sound.

[0027] This configuration makes it possible to realize electronic device 200 that maintains good sound quality, particularly high characteristics in the high frequency range, which has not been possible with conventional devices, as described above.

[0028] Although the application of speaker 100 to electronic device 200 has been described as a mini component audio system, the application is not limited to this. For example, the speaker can be applied to automobile audio systems, portable audio devices, etc. Furthermore, the speaker can be widely applied and developed to electronic devices such as video devices such as LCD televisions and organic EL display televisions, information and communication devices such as mobile phones, and computer-related devices.

[0029] Next, a second application example of the speaker 100 will be described. Fig. 5 is a cross-sectional view showing a moving body that is the second application example of the speaker 100. In the case of this embodiment, an automobile will be exemplified as the moving body 300 and described.

[0030] As shown in the figure, a speaker 100 equipped with a sub-diaphragm 150 of the present disclosure is incorporated into the rear tray or front panel of a moving body 300. The speaker 100 emits sound into the moving body based on an audio signal transmitted from a car navigation system or a car audio system separately attached to the moving body.

[0031] According to the sub-diaphragm 150 of the speaker 100 attached to the moving body 300 in this way, the high frequency characteristics of the overall sound range of the speaker 100 can be improved, and high performance can be achieved.

[0032] The sub-diaphragm 150 described above has annular edge portion 153 that extends in a plane, and therefore can improve the structural strength of sub-diaphragm 150 while suppressing an increase in the weight of sub-diaphragm 150. This effect is more pronounced in a paper sub-diaphragm 150, which has lower structural strength, than in a metal sub-diaphragm 150, which has relatively high structural strength. Furthermore, speaker 100 equipped with sub-diaphragm 150 can suppress the tendency for high-frequency characteristics to gradually decrease up to 20 kHz, where the physical property value of the high-frequency limit frequency is high, and can extend the high-frequency characteristics.

[0033] The present invention is not limited to the above-described embodiments. For example, the present invention may be embodied in another embodiment by arbitrarily combining the components described in this specification or by excluding some of the components. Furthermore, the present invention also includes various modifications that would occur to a person skilled in the art without departing from the spirit of the present invention, i.e., the meaning of the wording of the claims.

[0034] For example, the shape of main diaphragm 110 is not particularly limited. The shape of main diaphragm 110 is not limited to the conical shape in the present embodiment, but may be a three-dimensional shape such as an elliptical cone shape. Furthermore, it is not limited to a three-dimensional shape, and may be a planar shape such as a circular plate shape or a rectangular plate shape.

[0035] Furthermore, the speaker 100 is not limited to an internal magnet type magnetic circuit 120, but may be a speaker 100 having an external magnet type magnetic circuit.

[0036] Furthermore, voice coil body 140 may not include a bobbin but may include coil 142. [Industrial Applicability]

[0037] The sub-diaphragm and the speaker including the sub-diaphragm according to the present disclosure can be applied to electronic devices such as audiovisual devices and information and communication devices, and to mobile objects such as automobiles. [Explanation of symbols]

[0038] 100 speakers 102 Magnetic Gap 110 Main diaphragm 111 Edge 120 Magnetic Circuit 121 Magnet 122 Plate 123 York 130 frames 140 Voice coil body 141 Bobbin 142 Coil 150 Sub-diaphragm 151 Sealing part 152 Slope 153 Edge 154 Depression 155 Bend 160 Damper 200 Electronic equipment 201 Enclosure 202 woofer 203 Speaker System 204 Amplifier 205 Tuner 206 Player 300 Mobile

Claims

1. A sub-diaphragm used in a speaker, an inclined portion whose opening area increases in a direction in which sound is emitted from the speaker; an annular edge portion extending linearly outward from the tip edge of the inclined portion along a direction perpendicular to the discharge direction, The edge portion and the inclined portion are integrally formed, the edge portion is denser than the sloped portion; Sub-diaphragm.

2. The inclined portion and the edge are bent via a bent portion, and the length from the bent portion to the tip of the edge is in the range of 1 mm to 8 mm, or 1% to 20% of the maximum diameter of the inclined portion. The sub-diaphragm according to claim 1 .

3. The edge portion has a thickness smaller than that of the inclined portion. The sub-diaphragm according to claim 1 or 2.

4. The edge has a hardening agent attached thereto. The sub-diaphragm according to claim 1 or 2.

5. In the ejection direction, the radius of curvature of the tip end of the inclined portion is longer than the radius of curvature of the base end. The sub-diaphragm according to claim 1 or 2.

6. A main diaphragm; A magnetic circuit; a frame that holds the magnetic circuit and the main diaphragm; a voice coil body having one end coupled to the main diaphragm and the other end disposed in a magnetic gap of the magnetic circuit; a sub-diaphragm disposed in front of the main diaphragm in the sound emission direction, The sub-diaphragm is an inclined portion whose opening area increases in the direction of release; an annular edge portion extending linearly outward from the tip edge of the inclined portion along a direction perpendicular to the discharge direction, The edge portion and the inclined portion are integrally formed, the edge portion is denser than the sloped portion; Speaker.

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