JP4694176B2 - Speaker - Google Patents

Description

  The present invention relates to a thin speaker.

When a speaker is incorporated in a thinned device, the speaker is also required to be thin. In particular, when this apparatus is a thin television using a liquid crystal panel or the like, the thickness of the thin television is inevitably reduced. When a speaker is incorporated into such a thin device, a thin speaker is particularly required. As such a thin speaker, there is one having a structure in which a magnetic circuit is arranged on the front side of a diaphragm (Patent Document 1).
JP-A-62-136196

  Conventional speakers have the following problems. That is, in the speaker described in Patent Document 1, as shown in FIG. 7, the first frame 101 is provided on the front side of the diaphragm 110, and the magnetic circuit 120 is attached to the first frame 101. A separate second frame 102 having a concave shape is provided on the rear surface side of the diaphragm 110, and a damper 130 is attached to the second frame 102. The second frame 102 is fixed to the first frame 101. In the conventional speaker, the diaphragm 110 and the damper 130 are attached to the voice coil 140.

  With such a structure, the conventional speaker needs to increase the distance a in order to avoid contact between the diaphragm 110 and the yoke 121 of the magnetic circuit 120 due to the amplitude of the diaphragm 110. Further, in order to fix the diaphragm 110 and the damper 130 to the voice coil 140, a thickness b is required. Therefore, in the conventional speaker, since the distance a is increased and the thickness b is required, the speaker becomes thicker by these amounts.

  In addition, the conventional speaker requires two frames (first and second frames 101 and 102), which requires a large number of parts and a complicated manufacturing process. Further, in the conventional speaker, since the terminal 150 is attached to the side surface of the second frame 102, the damper 130 is approaching, but the terminal 150 cannot be extended to make the speaker thin, and soldering is performed. The manufacturing process is not easy.

  In order to solve this drawback, a speaker having a reduced thickness, a reduced number of parts, and a simplified manufacturing process was previously filed as Japanese Patent Application No. 2004-164542 by the present applicant.

  In this speaker, a damper is attached to a diaphragm, a voice coil is attached to the diaphragm, and the shape of the speaker is made thin by the amount of the damper attached to the voice coil. In addition, a rising portion is provided in the damper, and this rising portion is attached to the frame via a gasket so that two conventional frames are combined into one to reduce the number of parts. Furthermore, a relief portion is provided in the portion of the diaphragm facing the tip of the yoke so as not to come into contact with the yoke during vibration of the diaphragm, and the speaker is made thin while ensuring an amplitude distance and a reproduction band.

  However, this speaker has a configuration in which the diaphragm is driven by a single magnetic circuit provided at the center of the diaphragm, and thus there is a problem that the driving force is weak and unsuitable for use as a subwoofer.

  The present invention has been proposed in view of the above, and the object of the invention is to increase the driving force of the diaphragm in addition to reducing the thickness, and to be used as a subwoofer. The object is to provide a speaker.

In order to solve the above-mentioned problem, the invention of claim 1 includes a plate-like frame 1 and a vibration provided on the back side of the frame 1 and having an elongated front view and a substantially conical shape and supported by a damper 4. A plate 5, a plurality of magnetic circuits 9 provided on the front side of the diaphragm 5 and attached to the back side of the frame 1, and disposed in a magnetic gap portion of these magnetic circuits 9, the diaphragm 5 The damper body 4a having a plurality of voice coils 8 provided in the longitudinal direction and having a corrugation formed in a front view has an elongated shape substantially corresponding to the front view shape of the diaphragm 5, The inner peripheral portion is attached to the inner peripheral side rear surface of the diaphragm main body 5b having a substantially conical shape of the diaphragm 5 driven by a plurality of voice coils 8, and the outer peripheral portion of the damper main body 4a faces forward. Extend A raised portion 4b is formed, and the outer peripheral portion of the diaphragm 5 is attached with a front end portion 2a housed in a front end portion of the rising portion 4b and a first recess 1c formed in the outer peripheral portion of the frame 1. was sandwiched and supported by the rear end portion 2b of the gasket 2, the inner peripheral portion of the diaphragm body 5b, a tapered avoid contact with the yoke wall rear portion of the magnetic circuit 9 when the diaphragm vibration or A flat relief portion is formed.

  According to the present invention, the frame 1 is made into one plate-like one, the damper 4 is attached to the diaphragm 5, the voice coil 8 is provided on the diaphragm 5, and the amount of attachment of the damper 4 to the voice coil 8 is the same as that of the speaker. The shape is thin. In addition, a tapered or flat relief portion is formed in the inner peripheral portion of the diaphragm main body 5b facing the yoke peripheral wall, so that a thin shape is realized while ensuring an amplitude distance and a reproduction band. Further, the damper 4 is provided with a rising portion 4b, and the rising portion 4b is connected to the frame 1 via the gasket 2, so that the conventional separate frame shown in Patent Document 1 is unnecessary, and the parts are accordingly increased. The score has been reduced.

  Further, since a plurality of driving voice coils 8 are provided in the longitudinal direction of the diaphragm 5, a sufficient driving force can be obtained, and the diaphragm 5 can be driven by this, so that the sound pressure (SPL) is increased. can do.

  Further, since the lowest resonance frequency (Q) can be lowered, it can be used as a subwoofer.

  Further, since a plurality of voice coils 8 are provided, energy (heat) applied to one voice coil 8 is dispersed and reduced, so that high input resistance can be achieved.

  In addition, a plurality of ordinary speakers (twin drives) having a plurality of magnetic circuits are provided with a plurality of dampers. However, in the present invention, a single damper 4 is provided, so that a plurality of conventional twin drive types are provided. In addition, there is no malfunction due to variations in the displacement of the damper, and the production process is simplified, so stable production is possible.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
1 is a side sectional view of an embodiment of the speaker according to the present invention, FIG. 2 is a front view of the speaker, FIG. 3 is a plan view, FIG. 4 is a sectional view taken along line AA in FIG. B line sectional drawing is shown.

  In these drawings, 1 is a substantially plate-like frame. As shown in the front view of FIG. 2, the outer shape of the frame 1 is a horizontally long rectangular shape, and mounting holes 1a are formed at four corners. A plurality of sound holes 1b are formed. As shown in FIGS. 1, 4 and 5, a first recess 1 c is formed on the rear outer peripheral portion.

  As shown in FIG. 2, the first recess 1c is formed in an elongated shape such as an oval, a track shape, or a substantially rectangular shape, and the first recess 1c is shown in FIGS. 1, 4, and 5. Thus, the front end 2a of the elongated cylindrical gasket 2 having the same shape as viewed from the front is accommodated, and the front end 2a is attached.

  An outer peripheral portion of the edge 3 and a bent portion 4c formed on the outer periphery of the damper 4 are attached to the rear end portion 2b of the gasket 2 via an adhesive, and an outer peripheral portion 5a of the diaphragm 5 is attached to the inner peripheral portion of the edge 3. Is attached.

  When viewed from the front, the diaphragm 5 has an elongated outer shape such as an oval, a track shape, or a substantially rectangular shape, and has a diaphragm body 5b having a substantially conical shape as shown in FIG. The portion is formed with a neck portion 5c that is substantially tapered toward the rear, and the bottom portion 5d of the diaphragm 5 is flat.

  The damper main body 4a in which the corrugation of the damper 4 is formed is formed in a shape substantially corresponding to the front view shape of the diaphragm 5 as shown in FIG. A rising portion 4b extending in the direction of the outer periphery of the gasket 4 is formed. The outer peripheral edge of the rising portion 4b is bent in an L shape, and the bent portion 4c faces the rear end 2b side of the gasket 2 to The portion is attached to the rear surface on the inner peripheral side of the diaphragm body 5b having a substantially conical shape, and the outer peripheral portion of the edge 3 is sandwiched and supported between the bent portion 4c of the damper 4 and the rear end portion 2b of the gasket 2. Yes.

  Thus, in the present invention, the damper 4 having a three-dimensional shape is configured to hold the diaphragm 5.

  As shown in FIG. 1, first and second voice coil attachment holes 5e are formed in the bottom of the diaphragm 5 along the length direction of the diaphragm 5, and a cylindrical shape is formed in these attachment holes 5e. 1. The outer peripheral part of the 1st, 2nd voice coil bobbin 6 is each attached via the adhesive agent, and a thin disk is attached to the rear end part of the 1st, 2nd voice coil bobbin 6 which protruded from the bottom part 5d of the diaphragm 5 to the back side. A dust-proof cap 7 is attached.

  As shown in FIG. 1, first and second voice coils 8 are provided on the front outer periphery of the first and second voice coil bobbins 6, and each voice coil 8 has first and second magnetic circuits, respectively. 9 magnetic gaps.

  Each magnetic circuit 9 includes a bottomed cylindrical yoke 10, a short columnar magnet 11 provided in the yoke 10, and a disk-shaped pole 12 provided on the back surface of the magnet 11. A magnetic gap is formed between the outer peripheral surface of the pole 12 and the inner peripheral surface of the cylindrical yoke peripheral wall 10b facing the pole 12, and the voice coil 8 is disposed in this portion.

  The outer periphery of the bottom 10a on the front side of the yoke 10 is positioned in a positioning / mounting / fixing recess 1d formed in the center of the back of the plate-like frame 1, and the center of the yoke bottom 10a is the front of the frame 1 A mounting screw 13 screwed in from the side is screwed, whereby a plurality of magnetic circuits 9 are fixed to the frame 1. The head 13a of the mounting screw 13 is located in a recess 1e formed on the front side of the frame 1, and absorbs the protrusion of the head 13a to reduce the thickness.

  Thus, in the present invention, in order to make the speaker thin, first, the frame 1 is made into one member, and the frame 1 is made into a substantially flat plate shape, and the front end portion 2a of the gasket 2 is housed and attached to the back surface thereof. A first recess 1c is formed, and a part of the dimension of the gasket 2 is absorbed by the first recess 1c.

  A part of the yoke 10 is also housed in a recess 1d formed on the back surface of the frame 1, and a recess 1e for housing the mounting screw head is formed on the front surface side of the frame 1, and a substantially central portion of the recess 1e is formed. The mounting screw 13 is inserted into the screw hole formed in the above, and the mounting screw 13 is screwed into the screw hole formed in the yoke bottom portion 10a to fix the magnetic circuit 9.

  In the conventional example in Patent Document 1, as described above, the frame is provided on the front surface of the diaphragm, and the first frame for attaching the magnetic circuit and the second system that supports the vibration system such as the voice coil, the damper, and the diaphragm. However, in the present invention, the frame 1 is formed as a plate-like member on the back surface of the first and second frames. A magnetic circuit 9 is attached, the damper 4 is made into a three-dimensional shape, and a diaphragm 5 provided with a plurality of voice coils 8 provided in the length direction is attached to the inner periphery of the damper 4. A rising portion 4b extending is formed, and an edge 3 provided on the outer peripheral portion 5a of the diaphragm 5 is supported by the front end portion and the gasket 2, and a plurality of voice coils 8 are formed by one damper 4. Ri is adapted to support the vibrating plate 5 to be driven.

  Further, when the vibration plate 5 vibrates forward, the neck portion 5c of the vibration plate 5 is tapered so as not to come into contact with the rear end portion of the peripheral wall of the yoke 10, thereby forming a relief portion to ensure an amplitude distance. ing.

  Instead of the tapered shape, the relief portion may have a flat shape by extending the bottom portion 5d of the diaphragm 5 to the outside as shown in FIG.

  In FIG. 3, reference numerals a and b are tinsel wires, c is a voice coil lead wire, and d is a line representing the shape of the diaphragm.

  In operation, the diaphragm 5 is driven via the voice coil 8 by inputting voice signals to the plurality of voice coils 8. In this case, since the voice coil 8 is plural, the driving force is increased as compared with the case of one. Note that a lead wire (not shown) of the voice coil 8 is drawn to the outer peripheral side along the diaphragm body 5b, connected to a terminal plate (not shown), and an input signal is applied via the terminal plate. Since these structures are not related to the gist of the present invention, they are omitted.

  When the diaphragm 5 vibrates, in the present invention, the diaphragm 5 can be driven by a plurality of voice coils 8 with a high driving force, so that the sound pressure can be improved. In addition, in the conventional twin drive type speaker, a plurality of dampers are provided. However, in the present invention, since the damper 4 supporting the diaphragm 5 is one, there is no variation in the damper displacement.

  In the above-described embodiment, the diaphragm 5 and the edge 3 have a separate structure, but may be integrated. In the illustrated example, the frame 1 has a rectangular shape, but is oval or track-shaped. It is also good. As described above, the specific configuration is not limited to the illustrated embodiment, and any design change or the like within a range not departing from the gist of the present invention is included in the present invention.

1 shows a side sectional view of one embodiment of the present invention. The front view of an Example same as the above is shown. The top view of an Example same as the above is shown. AA line sectional view in FIG. 3 is shown. A sectional view taken along line BB in FIG. 3 is shown. FIG. 3 shows a partial cross-sectional view of another embodiment of the present invention. The sectional side view of a prior art example is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 1a Mounting hole 1b Sound hole 1c 1st recessed part 1d Yoke positioning and mounting recessed part 1e Recessed part for mounting screw head storage 2 Gasket 2a Gasket front end part 2b Gasket rear end part 3 Edge 4 Damper 4a Damper main body 4b Rising part 4c Bending part 5 of damper outer periphery 5 Diaphragm 5a Diaphragm outer periphery 5b Diaphragm body 5c Diaphragm neck 5d Diaphragm bottom 5e Mounting hole 6 First and second voice coil bobbin 7 Dustproof cap 8 Voice coil 9 Magnetic circuit 10 Yoke 10a Yoke bottom 10b Yoke peripheral wall 11 Magnet 12 Pole 13 Mounting screw 13a Head

Claims (1)

A plate-shaped frame (1), a diaphragm (5) provided on the back side of the frame (1), having a long and narrow frontal view, substantially conical, and supported by a damper (4), and this vibration A plurality of magnetic circuits (9) provided on the front side of the plate (5) and attached to the back side of the frame (1), and disposed in a magnetic gap portion of these magnetic circuits (9), the vibration A plurality of voice coils (8) provided in the length direction of the plate (5) ,
The front view shape of the damper main body (4a) on which the corrugation is formed has an elongated shape substantially corresponding to the front view shape of the diaphragm (5), and the inner periphery thereof is formed by a plurality of voice coils (8). A rising portion (4b) which is attached to the inner peripheral back surface of the diaphragm main body (5b) having a substantially conical shape of the driven diaphragm (5), and the outer periphery of the damper main body (4a) extends forward. ), And the outer peripheral portion of the diaphragm (5) has a front end portion in a front end portion of the rising portion (4b) and a first recess (1c) formed in the outer peripheral portion of the frame (1). Sandwiched and supported by the rear end (2b) of the gasket (2) in which (2a) is stored and attached,
The inner periphery of the diaphragm main body (5b) is formed with a tapered or flat relief that avoids contact with the rear end of the yoke peripheral wall of the magnetic circuit (9) during vibration of the diaphragm. Speaker.

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