JP2002218585A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a narrow width speaker applied to various video audio units that properly selects a reproduced frequency band, the efficiency and distortion or the like even with a low profile. SOLUTION: In a narrow width speaker, by forming a relation that the vicinity of a coupled part of a flat diaphragm 20 and a voice coil 8 is made high density part 20a, and the circumferential edge is made a low density part 20b, or vice versa with the diaphragm 20, the reproduced frequency band, the efficiency and distortion or the like are adjusted to obtain the speaker with a desired characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker used for various audiovisual equipment, and more particularly to a loudspeaker having a narrow width.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 26 is a cross-sectional view of a conventional narrow-width type slim-type speaker in the short-diameter direction, and FIG. 27 is a perspective view of a diaphragm which is a main part of the speaker.

According to FIGS. 26 and 27, 1a and 1a
Reference numeral b denotes a rectangular parallelepiped magnet magnetized in the opposite direction. The upper plate 2 provided with the magnetic gap 2a at the upper portion is adhesively bonded to the lower plate 3 provided at the lower portion with the magnetic gap 3a. The magnetic circuit 5 is constituted.

Reference numeral 6 denotes a frame adhesively bonded to the upper plate 2. Reference numeral 7 denotes a vibration plate whose outer peripheral edge is adhesively bonded to the frame 6, and reference numeral 8 denotes a center of a short diameter of the vibration plate 7 in a long diameter direction. This is a flat voice coil in which the lower portion 8b is supported by a damper 10 which is inserted through the formed slit 7a and adhered and fixed at the upper portion 8a, and is adhesively bonded to the lower plate 3 via a damper supporting portion 10a.

The voice coil 8 of the damper 10
, The upper and lower coil portions 8c of the voice coil 8 are formed by the slit-shaped magnetic gap 2a of the upper plate 2 and the slit-shaped magnetic gap 3 of the lower plate 3.
a.

[0006]

However, in the above-mentioned conventional loudspeaker, the diaphragm 7 has a V-shaped cross section in order to secure a wide reproduction frequency band and low distortion characteristics, but the weight of the vibration system increases and the efficiency decreases. I do. In addition, there has been a problem that it is difficult to reduce the thickness.

An object of the present invention is to provide an excellent speaker that solves the above problems and solves the problems of a wide frequency band, high efficiency, low distortion, and thinness.

[0008]

According to a first aspect of the present invention, there is provided a loudspeaker using a flat voice coil, wherein the loudspeaker is connected to the voice coil as a diaphragm. A plate-shaped diaphragm with a density different from the density in the vicinity of the part and the density in the outer periphery is used. frequency band,
The efficiency and distortion can be appropriately selected.

According to a second aspect of the present invention, the density of the diaphragm of the loudspeaker according to the first aspect in the vicinity of a portion connected to the voice coil is increased, and a wide frequency range as the loudspeaker is provided. An object of the present invention is to provide an excellent loudspeaker realizing a band, high efficiency and low distortion.

According to a third aspect of the present invention, the density of the vibrating plate according to the first aspect in the vicinity of a portion connected to the voice coil is reduced, and the weight of the vibrating system in the peripheral portion is reduced. By increasing the frequency, the lower limit of the reproduction frequency band is lowered, and a speaker excellent in low-frequency reproduction can be provided.

According to a fourth aspect of the present invention, the diaphragm according to the first aspect is formed of a resin molded plate having a different expansion ratio, and can be easily formed by resin molding by foam molding. Things.

According to a fifth aspect of the present invention, the diaphragm according to the first aspect is easily formed by a resin molded plate obtained by stepwise injection or press molding of at least two kinds of resins having different densities. It can be easily formed by resin molding by step injection or press molding.

According to a sixth aspect of the present invention, the diaphragm according to the first aspect is formed by combining at least two types of resin molded plates having different densities. It can be easily formed by combining different resin molded plates.

According to a seventh aspect of the present invention, the diaphragm according to the first aspect is formed by stepwise paper-making using at least two kinds of materials having different densities. It can be easily formed.

According to an eighth aspect of the present invention, the diaphragm according to the first aspect is formed by arranging skeleton-shaped ribs in a papermaking mold in advance and performing papermaking. It can be easily formed by using the difference between the density and the rib density.

According to a ninth aspect of the present invention, the diaphragm according to the first aspect is formed by insert-molding a fragment having a density different from that of the resin material during resin molding.
It can be easily formed by an insert.

According to a tenth aspect of the present invention, a plate-shaped diaphragm having a thickness different from a thickness near a portion connected to the voice coil and a thickness at an outer peripheral portion is used as the diaphragm. In the same manner as described above, the rigidity of the plate-shaped diaphragm is partially changed, so that the reproduction frequency band, efficiency, and distortion can be appropriately selected.

According to an eleventh aspect of the present invention, the thickness of the vibrating plate in the vicinity of the coupling portion with the voice coil of the tenth aspect is made thicker than the periphery, so that a wide frequency band and high efficiency as a speaker are provided. It is possible to provide an excellent speaker that realizes low distortion.

According to a twelfth aspect of the present invention, the thickness of the vibrating plate in the vicinity of the connection with the voice coil is made thinner than the peripheral edge, and the weight of the vibrating system in the peripheral portion is increased. Thus, the lower limit of the reproduction frequency band is reduced, and a speaker excellent in low-frequency reproduction can be provided.

According to a thirteenth aspect of the present invention, the diaphragm of the tenth aspect is formed by enclosing a gas or a liquid in a resin molding plate during molding, and the thickness is increased during molding. Alternatively, a molded flat diaphragm can be easily obtained by injecting and enclosing a liquid.

According to a fourteenth aspect of the present invention, the diaphragm according to the tenth aspect is formed by attaching a reinforcing rib to increase the thickness. A diaphragm can be obtained.

According to a fifteenth aspect of the present invention, the diaphragm according to the tenth aspect is formed by integrating members having different thicknesses to increase the thickness. Thus, a flat diaphragm can be easily obtained.

According to a sixteenth aspect of the present invention, the diaphragm according to the tenth aspect is formed by applying a viscoelastic material, an adhesive, or a paint to increase the thickness of the diaphragm. A plate can be obtained.

According to a seventeenth aspect of the present invention, the diaphragm according to the tenth aspect is formed by increasing the thickness by partially changing the forming pressure after paper-making. A flat diaphragm can be easily obtained by partially changing it.

The invention according to claim 18 of the present invention is characterized in that the diaphragm according to claim 10 is formed by forming a skeletal rib on a papermaking mold to make a paper and increasing the thickness thereof. A flat diaphragm can be easily obtained by arranging the ribs in a papermaking mold and performing papermaking.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the speaker of the present invention will be described below with reference to FIGS. In addition,
In the description, the same parts as those of the related art are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) FIG. 1 is a sectional view of a slim speaker as a preferred embodiment of the present invention in a short diameter direction, and FIG. 2 is a perspective view of a diaphragm which is a main part of the slim speaker. ,
FIG. 3 is a sectional view of the same, and mainly describes an embodiment according to claims 1 to 9.

According to the drawing, the difference from the prior art lies in the diaphragm. The diaphragm 20 is formed of a molded plate made of a flat foamed resin, and the portion connected to the upper portion 8a of the voice coil 8 is a high-density portion 20a. Is formed, and the peripheral portion is a low density portion 20b.
Is formed. The high density portion 20a and the low density portion 20b
Is formed by appropriately changing the expansion ratio when foaming the resin.

By providing the high-density portion 20a as described above, the high-density portion 20a has high rigidity and can be efficiently reproduced up to a high frequency range.
The occurrence of distortion due to unnecessary resonance is suppressed, and the peripheral portion is a low-density portion 20b to suppress a decrease in the reproduction level in the middle and high ranges due to an increase in the weight of the vibration system.

With the above structure, a wider reproduction frequency band, higher efficiency, and lower distortion can be achieved as compared with the case where the density of the diaphragm is made uniform, and the problems of high sound quality and thinness can be solved. .

Contrary to the first embodiment, when the density of the peripheral portion is increased and the density of the central portion is decreased by adjusting the foaming, the characteristic that the high frequency region is attenuated is obtained. As the weight increases, the lower limit of the reproduction frequency band also decreases, and a speaker suitable for low-frequency reproduction can be obtained.

In the first embodiment, the high density portion or the low density portion is formed at the center portion or the peripheral portion by adjusting the foaming density of the molding resin. In the following development example, the central portion will be described as a high-density portion, and the peripheral portion will be described as a low-density portion. However, as described in Embodiment 1, the peripheral portion will be described as a high-density portion. Alternatively, the central portion may be a low density portion. Hereinafter, a development example will be described.

FIGS. 4 and 5 are a perspective view and a sectional view, respectively, of a flat diaphragm in a developed example. Reference numeral 22 denotes a flat diaphragm. It is composed of a density portion 22a and a low density portion 22b, and is formed by stepwise injecting or press-molding two types of molding resins having different densities to form the high density portion 22a and the low density portion 22b. It is.

It is possible to provide speakers having various characteristics by changing the number and material of the resins having different densities at the time of molding and the molding shape of each resin.

FIGS. 6 and 7 are a perspective view and a cross-sectional view, respectively, of a flat diaphragm in another developed example. Reference numeral 24 denotes a flat diaphragm, which is in the vicinity of a portion connected to the voice coil 8. Is composed of a high-density portion 24a and a low-density portion 24b,
The resin molded plate forming the high density portion 24a and the low density portion 24b
Is formed by bonding and integrating resin molding plates for molding the same by known means such as welding and bonding.

In this development example, the diaphragm 2
Since it is the one that forms 4, a metal material, a cloth material, a paper material, or the like may be used without being particular about the resin molded plate, and these may be appropriately adopted and the shape and the number of materials may be changed for each material. Similar to the development example of FIG. 4, speakers having various characteristics can be provided.

FIGS. 8 and 9 are also a perspective view and a cross-sectional view of a flat diaphragm in another development example. Reference numeral 26 denotes a flat diaphragm, which is in the vicinity of a portion connected to the voice coil 8. Is composed of a high density part 26a and a low density part 26b,
The high-density portion 26a and the low-density portion 26b are formed by performing papermaking stepwise using papermaking materials having different densities.

FIGS. 10 and 11 also show a perspective view and a cross-sectional view of a flat diaphragm of another development example. Reference numeral 28 denotes a flat diaphragm. By providing it in the vicinity of the coupling part with the high-density part side with high rigidity, the periphery is made the low-density part side,
By arranging the ribs 28a in a papermaking mold and making paper, the density of the diaphragm 28 is set to a high-density portion near a portion connected to the voice coil 8 and a low-density portion at the periphery. It should be noted that speakers having various characteristics can be provided by appropriately changing the material and shape of the rib 28a.

FIGS. 12 and 13 are also a perspective view and a cross-sectional view of a flat diaphragm in another development example. Numeral 30 denotes a flat diaphragm formed by resin molding. A high-density insert member 30a is integrated by insert molding in the vicinity of the joint portion with. By appropriately setting the material, shape, and location of the insert member 30a, speakers having various characteristics can be provided.

(Embodiment 2) FIG. 14 is a perspective view of a diaphragm which is a main part of a slim speaker according to another embodiment of the present invention, and FIG. 15 is a sectional view of the diaphragm. The second embodiment mainly describes the embodiment according to the tenth to eighteenth aspects.

The first embodiment of the flat diaphragm used for the slim speaker is realized by partially changing the density of the diaphragm and changing the rigidity to achieve the desired characteristics of the speaker with a reduced thickness. In the second embodiment,
The present invention realizes desired characteristics of a loudspeaker while reducing its thickness by partially changing the thickness of the flat loudspeaker to change its rigidity. In addition, due to the partial change of the thickness,
Although it may not be appropriate to describe the diaphragm as flat or flat, the prior art has a V-shaped cross section, and when compared with this, is referred to as flat in the sense that it is more flat (flat). Use expressions.

According to the drawing, reference numeral 31 denotes a plate-shaped diaphragm, which has a thick portion 31a formed at a portion where the voice coil 8 is connected to the upper portion 8a, and a thin portion 3 formed at the peripheral portion.
1b.

The thick portion 31a and the thin portion 31b are formed by injecting and sealing a liquid or gas 31c inside when the diaphragm 31 is manufactured by molding.

As described above, by increasing the thickness in the vicinity of the coupling portion with the voice coil 8, this thick portion 31
a, the driving force from the voice coil 8 in a high frequency range can be efficiently converted to sound pressure, and the peripheral thin portion 3
1b is light and prevents a decrease in the reproduction level in the middle and high ranges due to an increase in the weight of the vibration system. Therefore, it is possible to provide a thinner speaker having a higher reproduction frequency band, higher efficiency, and lower distortion and higher sound quality than conventional ones.

In the second embodiment, the thick portion 31a
Is provided at the center, which is a coupling portion with the voice coil 8,
It is also possible to provide a thick part on the peripheral edge and configure the speaker as a thin part in the vicinity of the connection with the voice coil 8. In this case, the characteristic that the high frequency region is attenuated is obtained, and the vibration system of the peripheral part As the weight increases, the lower limit of the reproduction frequency band decreases, and a speaker suitable for low-frequency reproduction can be obtained.

The following is a development example, and a specific example will be described in which the thick portion is formed mainly in the vicinity of the connection portion with the voice coil 8. However, as described above, the peripheral portion is formed as the thick portion and the voice coil is formed. It is also possible to form a speaker by forming a diaphragm in the vicinity of the connection portion with the thin portion 8 so as to form a thin portion, and a speaker suitable for bass reproduction as described above can be obtained.

FIGS. 16 and 17 are a perspective view and a cross-sectional view of a flat-plate-shaped diaphragm as a developed example.
Reference numeral 32 denotes a plate-shaped diaphragm, which is composed of a thick portion 32a near the coupling portion with the voice coil 8 and a thin portion at the periphery. The thick portion 32a is formed by attaching a reinforcing rib. is there. The material and thickness of the diaphragm 32 and the reinforcing rib can be appropriately selected according to the required characteristics of the speaker.

FIGS. 18 and 19 are also a perspective view and a cross-sectional view of a plate-shaped diaphragm which is a developed example.
Reference numeral 33 denotes a substantially flat diaphragm, which is composed of a thick portion 33a in the vicinity of the connection portion with the voice coil 8 and a thin portion 33b on the periphery, and the thick portion 33a and the thin portion 33b formed of different members. Are bonded by a known method such as adhesion or welding. It should be noted that speakers having various characteristics can be formed by the shapes and materials of the thick portion 33a and the thin portion 33b and the adhesive used.

FIGS. 20 and 21 also show a perspective view and a sectional view of a diaphragm formed in a flat plate shape as a developed example.
An adhesive 34a is applied substantially linearly in the vicinity of a portion of the diaphragm 34 connected to the voice coil 8, thereby forming a thick portion and increasing rigidity.

Note that a known viscoelastic material or paint can be used instead of the adhesive 34a, and speakers having various characteristics can be formed depending on the application range, material, thickness, and the like.

FIGS. 22 and 23 are also a perspective view and a cross-sectional view of a flat-plate-shaped diaphragm which is a developed example.
After forming the diaphragm by papermaking, the pressure is partially changed during pressure molding to form the diaphragm 35 having the thick portion 35a and the thin portion 35b. It should be noted that speakers having various characteristics can be provided depending on the molding pressure and the formation range and position of the thick portion 35a and the thin portion 35b.

FIGS. 24 and 25 are also a perspective view and a cross-sectional view of a diaphragm formed in a flat plate shape as a developed example.
A skeleton-like rib 3 is previously placed on a papermaking mold for manufacturing a diaphragm.
The vibration plate 36 is formed by arranging 6a and making paper. The main part of the thick part having high rigidity is formed by the rib 36a, and speakers having various characteristics can be provided by appropriately changing the material and shape of the rib 36a.

[0053]

As described above, according to the present invention, a thin and narrow type in which the reproduction frequency band, efficiency, distortion, etc. can be appropriately selected by appropriately changing the density or thickness in the flat diaphragm. Is provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a slim speaker according to an embodiment of the present invention in a short diameter direction.

FIG. 2 is a perspective view of a diaphragm which is a main part of the diaphragm.

FIG. 3 is a sectional view of the same.

FIG. 4 is a perspective view of a development example of a diaphragm which is the main part.

FIG. 5 is a sectional view of the same.

FIG. 6 is a perspective view of a development example of a diaphragm which is the main part.

FIG. 7 is a sectional view of the same.

FIG. 8 is a perspective view of a development example of a diaphragm as the main part.

FIG. 9 is a sectional view of the same.

FIG. 10 is a perspective view of a development example of a diaphragm which is the main part.

FIG. 11 is a sectional view of the same.

FIG. 12 is a perspective view of a development example of a diaphragm which is the main part.

FIG. 13 is a sectional view of the same.

FIG. 14 is a perspective view of a diaphragm which is a main part of a slim speaker according to another embodiment of the present invention.

FIG. 15 is a sectional view of the same.

FIG. 16 is a perspective view of a development example of a diaphragm which is the main part.

FIG. 17 is a sectional view of the same.

FIG. 18 is a perspective view of a development example of a diaphragm which is the main part.

FIG. 19 is a sectional view of the same.

FIG. 20 is a perspective view of a development example of the diaphragm as the main part.

FIG. 21 is a sectional view of the same.

FIG. 22 is a perspective view of a development example of the diaphragm as the main part.

FIG. 23 is a sectional view of the same.

FIG. 24 is a perspective view of a developed example of a diaphragm as the main part.

FIG. 25 is a sectional view of the same.

FIG. 26 is a cross-sectional view of a conventional narrow-width slim-type speaker in a short-diameter direction.

FIG. 27 is a perspective view of a diaphragm which is a main part of the diaphragm.

[Explanation of symbols]

 2a, 3a Magnetic gap 5 Magnetic circuit 6 Frame 8 Voice coil 10 Damper 20, 22, 24, 26, 28, 30 Diaphragm 20a, 22a, 24a, 26a High density portion 20b, 22b, 24b, 26b Low density portion 28a Rib 30a Insert member 31, 32, 33, 34, 35, 36 Vibrating plate 31a, 32a, 33a, 35a Thick portion 31b, 33b, 35b Thin portion 31c Liquid or gas 34a Adhesive 36a Rib

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Okuyama 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Terms (reference) 5D012 BA06 BB05 CA04 CA07 5D016 AA05 BA01 BA04 BA05 EC01 FA02 JA08

Claims (18)

[Claims] 1. A magnetic circuit having a slit-shaped magnetic gap, a frame coupled to the magnetic circuit, a diaphragm having an outer peripheral edge coupled to the frame, and a magnetic plate coupled to the diaphragm and coupled to the magnetic plate. A speaker comprising a flat-shaped voice coil supported by a damper inserted into a magnetic gap of a circuit and coupled to the magnetic circuit, wherein at least a density and an outer peripheral portion near a coupling portion with the voice coil as the diaphragm are provided. Speaker using a flat diaphragm with different densities. 2. The loudspeaker according to claim 1, wherein the density in the vicinity of the coupling portion of the diaphragm with the voice coil is made high. 3. The loudspeaker according to claim 1, wherein the density in the vicinity of a portion of the diaphragm connected to the voice coil is low. 4. The speaker according to claim 1, wherein a resin molded plate having a different expansion ratio is used as the diaphragm. 5. The loudspeaker according to claim 1, wherein at least two or more resins having different densities are stepwise injected or pressed to form a diaphragm. 6. The speaker according to claim 1, wherein at least two or more resin molded plates having different densities are combined to form a diaphragm. 7. The speaker according to claim 1, wherein at least two or more kinds of materials having different densities are used to make a diaphragm in a stepwise manner. 8. The loudspeaker according to claim 1, wherein the diaphragm is formed by arranging skeleton-shaped ribs in a papermaking mold in advance and performing papermaking. 9. The loudspeaker according to claim 1, wherein fragments having a density different from that of the resin material are insert-molded to form the diaphragm. 10. A magnetic circuit provided with a slit-shaped magnetic gap, a frame coupled to the magnetic circuit, a diaphragm having an outer peripheral edge coupled to the frame, and a magnetic plate coupled to the diaphragm and coupled to the magnetic plate. A speaker comprising a substantially flat-shaped voice coil supported by a damper inserted into a magnetic gap of a circuit and coupled to the magnetic circuit, wherein at least the diaphragm has a thickness and an outer periphery near a coupling portion with the voice coil as the diaphragm. A speaker using a plate-shaped diaphragm with different thicknesses. 11. The loudspeaker according to claim 10, wherein the thickness of the diaphragm near the coupling portion with the voice coil is thicker than the peripheral edge. 12. The loudspeaker according to claim 10, wherein the thickness of the diaphragm near the coupling portion with the voice coil is thinner than the peripheral edge. 13. The loudspeaker according to claim 10, wherein a gas or a liquid is enclosed in the resin molded plate being molded to increase the thickness. 14. The loudspeaker according to claim 10, wherein the reinforcing rib is attached to increase the thickness. 15. The speaker according to claim 10, wherein members having different thicknesses are integrated to increase the thickness. 16. The speaker according to claim 10, wherein the thickness is increased by applying a viscoelastic material, an adhesive, or a paint. 17. The speaker according to claim 10, wherein after forming the paper, the molding pressure is partially changed to increase the thickness. 18. The loudspeaker according to claim 10, wherein the skeleton-shaped ribs are arranged in a papermaking mold to make a paper, thereby increasing the thickness.