JP2013128199A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the sound pressure in a wide frequency band, reproduce sharp low-pitched sound and clear mid-pitched and high-pitched sound, and achieve good reproducibility, high sound quality, and low cost even if the dimension in the sound emission direction is reduced.SOLUTION: A magnetic circuit part is held by a housing at the outer side of the housing and an opposite sound emission side, and a vibration transmission member is held by the housing at the inner side of the housing so as to move in a sound emission direction. The housing is an integrally formed member including: a recessed part housing the magnetic circuit part; a protruding part protruding to the opposite sound emission side at both sides of the recessed part; and a caving space which is formed in the protruding part and is caved from a surface of the magnetic circuit part on a sound emission side toward the opposite sound emission side.

Description

  The present invention relates to a speaker device.

  2. Description of the Related Art Conventionally, a speaker device having an enclosure is used to generate sound by being mounted on an audio device. Such a speaker device has a dynamic speaker unit, and generates a sound by vibrating a diaphragm included in the speaker unit.

  However, in recent years, acoustic devices have become smaller and thinner, and it is difficult to find a space for mounting a large-capacity enclosure therein. Therefore, a small speaker device that does not require the attachment of a separate member has been proposed (see, for example, Patent Document 1).

  FIG. 6 is a cross-sectional view showing the structure of a conventional speaker device.

  In the figure, reference numeral 811 denotes a frame of the speaker device, which is integrally molded so as to have a circular planar shape by resin molding, a magnetic circuit support portion 817 for supporting the magnetic circuit portion of the speaker device, and a circumference of the speaker device. A side wall portion 812 that functions as an outer wall, and a front plate portion 816 that couples the front end of the magnetic circuit support portion 817 and the inner periphery of the side wall portion 812.

  A dish-shaped yoke 834 is attached in the magnetic circuit support 817, and a magnet 841 and a plate 842 are accommodated in the recess of the yoke 834. A diaphragm 846 is disposed in front of the magnetic circuit support portion 817 (upward in the drawing). Further, a coil 843 is fixed to the rear surface of the diaphragm 846, and the coil 843 is disposed in a magnetic gap formed between the peripheral edge of the plate 842 and the yoke 834.

  In addition, a peripheral edge of a sealing cover 833 that is a circular plate member is fixed to the rear end of the side wall portion 812. By fixing the sealing cover 833, the rear surface of the frame 811 is closed (blocked), and a rear space 821 is formed between the sealing cover 833, the magnetic circuit support portion 817, and the front plate portion 816.

  The front plate portion 816 is formed with a plurality of communication passages 815 that connect the rear of the diaphragm 846 and the rear space 821. In addition, a peripheral edge of a cap member 826, which is a circular plate member and has a large number of ventilation holes (not shown), is fixed to the front end of the side wall portion 812. By adhering the cap member 826, the front surface of the frame 811 is blocked and entry of foreign matter is prevented.

  Thereby, since the frame 811 and the sealing cover 833 function as an enclosure (or box), good sound quality can be obtained.

JP 2003-348679 A

  However, in the conventional speaker device, since the rear space 821 is formed behind the magnetic circuit support portion 817 that accommodates the magnet 841 and the like, the size of the frame 811 in the front-rear direction is increased.

  In recent years, acoustic devices such as television receivers have been miniaturized and thinned. In particular, acoustic devices such as thin television receivers that use liquid crystal displays, plasma displays, and the like have large frames 811 inside. It is difficult to find a space for installing the speaker device provided with.

  However, if the size of the frame 811 is shortened by reducing the size in the front-rear direction so as to be attached to a thin and small acoustic device such as a thin television receiver, the volume of the rear space 821 is reduced and the sound quality is deteriorated. .

  In addition, since the front plate portion 816 exists between the rear side of the diaphragm 846 and the rear space 821, even if a plurality of communication paths 815 are formed, deterioration in sound quality is inevitable. Furthermore, since the sealing cover 833 is a separate member from the frame 811, it is difficult to reduce the manufacturing cost of the speaker device.

  The present invention solves the problems of the conventional speaker device, and functions as an enclosure, and inside the case body that also functions as a frame for holding a magnetic circuit portion held outside thereof. Even if the size of the sound emission direction is reduced by forming a recess that is recessed on the side opposite to the sound emission side than the sound emission side surface of the circuit portion, the sound pressure can be controlled in a wide frequency band. An object of the present invention is to provide a speaker device capable of reproducing sharp low-pitched sounds and clear mid-high sounds, having good sound reproducibility, high sound quality, and low cost.

  Therefore, in the speaker device of the present invention, the speaker device includes a diaphragm, a driver unit that vibrates the diaphragm, and a housing that functions as an enclosure that covers the anti-sound side of the diaphragm, The diaphragm and the housing have a narrow and narrow planar shape when viewed from the sound emission side, and the driver unit includes a magnetic circuit unit and a driving member that generates vibration in cooperation with the magnetic circuit unit. And a vibration transmission member that transmits the vibration of the drive member to the diaphragm, and the magnetic circuit unit is held by the housing on the outer side and on the anti-sound side, and the vibration transmission member is The housing is held by the housing so as to be movable in the sound emission direction inside the housing, and the housing includes a concave portion that accommodates the magnetic circuit portion, and a convex portion that protrudes toward the sound emitting side on both sides of the concave portion. And sound emission of the magnetic circuit portion formed in the convex portion , A concave space which recessed from the counter-sound output side surface of a member which is integrally formed with a.

  In another speaker device of the present invention, the surface of the convex portion on the side opposite to the sound emission side and the surface of the magnetic circuit portion on the side opposite to the sound emission side are substantially flush with each other.

  In still another speaker device of the present invention, at least one of the recessed spaces includes an opening communicating with the outside.

  In still another speaker device of the present invention, the opening further opens on a surface of the convex portion on the side opposite to the sound emission side.

  In still another speaker device of the present invention, the opening is connected to the recessed space by a duct extending in a direction orthogonal to the sound emitting direction, and opens to a side surface of the convex portion.

  According to the present invention, the speaker device functions as an enclosure, and in a casing that also functions as a frame for holding the magnetic circuit unit held on the outside of the speaker device, from the sound emission side surface of the magnetic circuit unit. A recess is formed to be recessed on the side opposite to the sound emission. This makes it possible to control the sound pressure in a wide frequency band even if the size in the sound output direction is reduced, and to reproduce sharp bass and clear mid to high sounds, resulting in good sound reproducibility. The sound quality can be improved and the cost can be reduced.

It is the perspective view of the speaker apparatus in the 1st Embodiment of this invention, Comprising: (a) is the figure seen from the sound emission side, (b) is the figure seen from the anti-sound side. It is a two-plane figure of the speaker apparatus in the 1st Embodiment of this invention, Comprising: (a) is a top view, (b) is AA arrow sectional drawing in (a). It is the exploded view of the speaker apparatus in the 1st Embodiment of this invention, and the figure seen from the sound emission side. It is the exploded view of the speaker apparatus in the 1st Embodiment of this invention, and the figure seen from the anti-sound emission side. It is a three-plane figure of the speaker apparatus in the 2nd Embodiment of this invention, (a) is a top view, (b) is a side view, (c) is BB arrow sectional drawing in (a). . It is sectional drawing which shows the structure of the conventional speaker apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of the speaker device according to the first embodiment of the present invention. In addition, in the figure, (a) is the figure seen from the sound emission side, (b) is the figure seen from the anti-sound side.

  In the figure, reference numeral 10 denotes a speaker device according to the present embodiment, which is used by being mounted on various audio equipment such as a television receiver, a radio receiver, a personal computer, a CD player, a DVD player, a game machine, etc. It is an audio generator that is driven by an audio signal and reproduces the audio signal. The speaker device 10 according to the present embodiment can be downsized. Therefore, typically, a thin television receiver using a liquid crystal display, a plasma display, or the like, a portable personal computer, a PDA (Personal Digital). Assistants) Used for thin or small electric devices such as portable game machines, electronic devices, etc., but used by attaching to any part of any kind, size, electric device, electronic device, etc. May be.

  In the present embodiment, expressions indicating directions such as upper, lower, left, right, front, rear, etc. used for explaining the configuration and operation of each part of the speaker device 10 are not absolute. Relative, suitable when the speaker device 10 or its parts are in the posture shown in the figure, but when the posture of the speaker device 10 or its components changes, it changes according to the change in posture Should be interpreted.

  The speaker device 10 includes a magnetic circuit unit 40 included in a driver unit for reproducing sound signals to generate sound, a diaphragm 46 that generates sound by being vibrated by the magnetic circuit unit 40, and It functions as a frame that is a holding member that holds each member such as the magnetic circuit unit 40 and the diaphragm 46, and also functions as an enclosure that surrounds the anti-sound side of the diaphragm 46 (opposite the sound emitting side). And a housing 11 as a housing. The driver unit also includes a voice coil 43, a bobbin 44, and the like, which will be described later.

  In addition, when viewed from the sound emission side (side from which sound is emitted), the entire speaker device 10 has an elliptical projection surface with an elongated rectangular shape or an elliptical shape having a major axis and a minor axis. (Da) The shape is a circle or oval. In other words, the overall size of the speaker device 10 is shorter than the dimension in the longitudinal direction (major axis direction) in the width direction (minor axis direction).

  The housing 11 is typically an integrally formed member made of a resin such as a synthetic resin, but may be made of a metal such as aluminum, steel, or copper, You may consist of a composite material which combined carbon, a metal, etc. The housing 11 has a front plate portion 16, a side plate portion 12, a rear plate portion 13, and an end plate portion 35, with the rear plate portion 13 on the anti-sound emission side as the bottom, and on the sound emission side. It is a bottomed container shape in which most of the front plate portion 16 is open, and is a bottomed container-like member whose dimension in the width direction (short axis direction) is short with respect to the dimension in the longitudinal direction (major axis direction). . A magnetic circuit housing recess 34 as a recess recessed toward the sound emission side is formed in the central portion of the housing 11 on the side opposite to the sound emission side in the long axis direction. Both sides are magnetic circuit support convex portions 17 as convex portions projecting relatively toward the opposite sound emission side. The magnetic circuit unit 40 is accommodated in the magnetic circuit accommodating recess 34 outside the housing 11.

  Thus, since the magnetic circuit part 40 is exposed to the outside of the housing 11, the heat generated by the magnetic circuit part 40 can be efficiently released to the outside air, and overheating of the speaker device 10, particularly the magnetic circuit 40 can be prevented. Can be prevented.

  In addition, a rear space 21 to be described later is formed inside the magnetic circuit support convex portion 17, and at least one of the rear plate portions 13 disposed on both sides of the magnetic circuit accommodating concave portion 34 has the above-mentioned A sound quality adjustment hole 15 a is formed as an opening which is an outer end of the communication path 15 that communicates the rear space 21 with the outside of the housing 11.

  Further, a terminal 53 that is electrically connected to a voice coil 43 described later is disposed around the sound quality adjustment hole 15 a of the rear plate portion 13. The terminal 53 is fitted with a counterpart terminal connected to an audio signal generating device such as an amplifier provided in an electric device, an electronic device or the like to which the speaker device 10 is attached, and an electric signal from the audio signal generating device. Is used to transmit the voice signal to the voice coil 43. The position of the terminal 53 does not necessarily need to be around the sound quality adjustment hole 15a of the rear plate portion 13, and can be set arbitrarily.

  The magnetic circuit unit 40 includes a magnet 41 having a rectangular plate shape or a rectangular parallelepiped outer shape having a low height, and a yoke 48 attached to the surface of the magnet 41 opposite to the sound emission side. . The magnet 41 is a permanent magnet made of a material having a high coercive force, and the yoke 48 is a member that forms a magnetic path, and is made of a material having a high magnetic permeability such as soft iron. The portion of the yoke 48 that is exposed on the side opposite to the sound emission side of the magnet 41 has a rectangular flat plate shape. The portion is formed such that the dimension in the major axis direction is slightly shorter than the dimension in the major axis direction of the magnet 41, and the dimension in the minor axis direction is the same as or slightly shorter than the dimension in the minor axis direction of the magnet 41. . The magnetic circuit section 40 has a rectangular flat plate shape or a rectangular parallelepiped outer shape as a whole, and is housed in the magnetic circuit housing recess 34 having a substantially rectangular flat plate shape or a rectangular parallelepiped shape with a low height. Installed.

  When the magnetic circuit portion 40 is housed and attached in the magnetic circuit housing recess 34, its anti-sounding side surface, that is, the anti-sounding side surface of the yoke 48 is the anti-radiation side of the rear plate portion 13. It is almost flush with the sound side. The magnetic circuit portion 40 has a length in the major axis direction slightly shorter than that in the major axis direction of the magnetic circuit housing recess 34, and a dimension in the minor axis direction is the same as or slightly the same as the dimension in the minor axis direction of the housing 11. Since it is short, it is securely received in the magnetic circuit receiving recess 34 and does not protrude outward from the side plate 12.

  As a result, the space for mounting the speaker device 10 in an electric device, electronic device, or the like is narrow, and the speaker device 10 is mounted even when there is no room beyond the dimension in the front-rear direction (sound emission direction) of the housing 11. Can be used.

  The housing 11 includes a cantilever-shaped magnetic circuit fixing member 18 that protrudes toward the anti-sound emission side. The magnetic circuit fixing member 18 has a hook formed at a free end, and is disposed at both ends of the magnetic circuit housing recess 34 in the long axis direction. A magnetic circuit fixing member housing recess 18 a is formed at a portion of the magnetic circuit support convex portion 17 corresponding to the magnetic circuit fixing member 18, and the magnetic circuit fixing member 18 extends outward in the major axis direction of the magnetic circuit housing recess 34. Absorbs displacement. The magnetic circuit portion 40 housed in the magnetic circuit housing recess 34 is locked by engaging the hook of the magnetic circuit fixing member 18 with the anti-sounding side surface of the magnet 41 and does not leave the magnetic circuit housing recess 34. It is like that. Therefore, the magnetic circuit portion 40 can be easily and reliably attached to the housing 11 without using attachment members such as screws and metal fittings.

  The front plate portion 16 is formed with a diaphragm housing opening 16a described later, and the diaphragm 46 is housed in the diaphragm housing opening 16a. The diaphragm 46 has a projection surface with respect to a plane having an elongated rectangular shape, an ellipse having a major axis and a minor axis, an oval shape, or the like, and the dimension in the minor axis direction is a housing. 11 is set to the same or slightly shorter dimension in the minor axis direction. Therefore, when viewed from the sound emission side of the speaker device 10, the front plate portion 16 exists on the outer side in the long axis direction of the diaphragm 46, but the front plate portion 16 hardly exists on the outer side in the short axis direction of the diaphragm 46. . Note that a portion of the front plate portion 16 on the outer side in the major axis direction of the diaphragm 46 has an effect as a baffle that is a partition wall for preventing the sound emitted from the anti-sound emission side from flowing into the sound emission side.

  The diaphragm 46 is integrally connected to a central opening 46a formed at the center thereof, a diaphragm edge 46b integrally connected to the outer periphery, and an outer periphery of the diaphragm edge 46b. Gasket part 46c. A dust cap 45 attached to the front end of a bobbin 44 described later is accommodated in the central opening 46a. The diaphragm edge portion 46b has a curved cross-sectional shape to increase flexibility. In addition, the planar shape of the diaphragm edge portion 46b is an ellipse or an oval shape having a major axis and a minor axis. Further, the gasket portion 46c is a flat plate member, and the shape of the outer peripheral edge thereof is such a shape that four corners of an elongated rectangle are obliquely cut off.

  The end plate portion 35 has an attachment portion 35a. The mounting portion 35a includes a fixed plate portion 35b that extends in parallel with the front plate portion 16 and extends outward in the longitudinal direction from the end plate portion 35, and a mounting opening 35c. The fixing plate portion 35b is a portion that comes into contact with a speaker fixing member (not shown) included in an electric device, an electronic device, or the like to which the speaker device 10 is attached. Further, the attachment opening 35c is a portion through which a fixing member such as a bolt or a screw is inserted. Note that the shape and size of the mounting portion 35a are appropriately changed according to the shape and size of the portion where the speaker device 10 is mounted in a housing of an electric device, an electronic device, or the like. For example, the diameter of the mounting opening 35c is changed according to the outer diameter of a fixing member such as a bolt or a screw. Further, the shape and size of the fixed plate portion 35b are changed according to the shape and size of the speaker fixing member provided in the electric device, the electronic device, or the like.

  Next, the internal structure of the speaker device 10 will be described.

  FIG. 2 is a two-side view of the speaker device according to the first embodiment of the present invention, and FIG. 3 is an exploded view of the speaker device according to the first embodiment of the present invention, viewed from the sound emission side. 4 is an exploded view of the speaker device according to the first embodiment of the present invention, as viewed from the side opposite to the sound emission side. 2A is a plan view, and FIG. 2B is a cross-sectional view taken along line AA in FIG.

  As shown in the figure, the magnetic circuit unit 40 further includes a plate 42 as a top plate attached to the sound emission side surface of the magnet 41. The plate 42 has a rectangular flat plate shape and is a member that forms a magnetic path like the yoke 48, and is made of a material having high magnetic permeability such as soft iron. The magnet 41 includes a center hole 41a that penetrates the center in the thickness direction (vertical direction in FIG. 2B), and the plate 42 also has the center in the thickness direction (FIG. 2B). A central hole 42a penetrating in the vertical direction is provided. The center hole 41 a of the magnet 41 and the center hole 42 a of the plate 42 are formed to be concentric with the plate 42 attached to the magnet 41. It is desirable that the central hole 42a of the plate 42 has a smaller diameter than the central hole 41a of the magnet 41.

  Further, the yoke 48 includes a columnar central column portion 48a extending vertically from the center in the sound emission side direction. Then, with the yoke 48 attached to the magnet 41, the central column portion 48 a is inserted into the central hole 41 a of the magnet 41 and the central hole 42 a of the plate 42. A space formed between the inner peripheral surface of the central hole 42a of the plate 42 and the outer peripheral surface of the central column portion 48a of the yoke 48 becomes a magnetic gap, and a voice coil 43 as a coil is disposed in the magnetic gap. Is done.

  The voice coil 43 is formed, for example, after a cylindrical bobbin 44 that extends a conductive wire made of a highly conductive material such as copper in the front-rear direction, that is, the sound emission direction (upward direction in FIG. 2B). It is a member formed by wrapping around the outer peripheral surface of the end portion, and functions as a driving member. The voice coil 43 has a thin cylindrical shape as a whole, and is disposed in the magnetic gap so as to be movable in the front-rear direction, that is, in the sound emission direction.

  The bobbin 44 functions as a vibration transmission member, extends forward from the front end of the voice coil 43, and a dust cap 45, which is a substantially disk-shaped member, is connected to the front end. . The bobbin connecting portion 51 of the damper 50 is connected to the outer surface of the bobbin 44. The housing connection portion 56 of the damper 50 is connected to the housing 11. Thus, the voice coil 43 emits sound without contacting both surfaces of the magnetic gap, that is, the inner peripheral surface of the central hole 42a of the plate 42 functioning as a magnetic pole and the outer peripheral surface of the central column portion 48a of the yoke 48. It is held movably in the direction.

  A cord 52 is attached to the bobbin 44. The cord 52 is an electric wire that transmits an audio signal, which is an electrical signal, to the voice coil 43. One end (not shown) is connected to the voice coil 43 and the other end is connected to a terminal 53. The code 52 has a long overall length, but in FIGS. 3 and 4, only a part is drawn for the convenience of illustration.

  Furthermore, the inner peripheral edge of the central opening 46 a of the diaphragm 46 is connected to the outer surface of the bobbin 44. The diaphragm 46 is disposed in front of the damper 50, that is, on the sound emission side. The gasket portion 46 c of the diaphragm 46 is made of a material having flexibility such as EVA (ethylene-vinyl acetate copolymer resin), and the rear surface is formed on the front plate portion 16 of the housing 11. The housing opening 16a is fixedly attached to the peripheral edge 16b with an adhesive or the like. Accordingly, the diaphragm 46 is held by the front plate portion 16 without being disturbed by vibration.

  As shown in FIG. 4, the magnetic circuit housing recess 34 includes a partition plate portion 37 parallel to the front plate portion 16 and the rear plate portion 13, and a pair extending perpendicular to the partition plate portion 37 and extending in the sound emission direction. And a magnetic circuit supporting convex side portion 17a. A magnetic circuit fixing member 18 extending along the magnetic circuit support convex side portion 17a is disposed near the center of each magnetic circuit support convex side portion 17a.

  The partition plate portion 37 is a rectangular flat plate-shaped portion that partitions the inside and the outside of the housing 11, and is positioned between the front plate portion 16 and the rear plate portion 13 in the sound emission direction, and the magnetic circuit housing recess portion 34. The sound emission side surface of the plate 42, which is the sound emission side surface of the magnetic circuit unit 40 accommodated therein, abuts. As described above, when the magnetic circuit portion 40 is housed and attached in the magnetic circuit housing recess 34, the surface on the anti-sound emission side of the magnetic circuit portion 40 is substantially flush with the surface on the anti-sound emission side of the rear plate portion 13. Therefore, in the sound emission direction, the distance between the partition plate portion 37 and the rear plate portion 13 is substantially equal to the dimension of the magnetic circuit portion 40 in the thickness direction.

  The partition plate portion 37 is formed with a coil passage opening 36 penetrating the center in the thickness direction. As shown in FIG. 2B, almost the entire bobbin 44 is located inside the housing 11, that is, on the sound emission side of the partition plate portion 37, but at least the rear end portion of the voice coil 43 is the coil. It passes through the passage opening 36 and extends to the side opposite to the sound emission side from the partition plate portion 37, thereby reaching the magnetic gap located on the side opposite to the sound emission side from the partition plate portion 37. .

  Further, as shown in FIG. 3, a damper connecting portion 37 a extending to the sound emission side from the partition plate portion 37 is formed at the periphery on the sound emission side of the partition plate portion 37. The housing connection portion 56 of the damper 50 is fixed to the sound emitting surface of the damper connection portion 37a with an adhesive or the like.

  In the present embodiment, the damper 50 is an integrally formed flat member made of a resin such as nylon, and has an annular, that is, flange-like bobbin connection portion 51 and the bobbin connection. A rectangular annular housing connecting part 56 surrounding the periphery of the part 51 and a pair of substantially S-shaped connecting arm parts 55 connecting the bobbin connecting part 51 and the housing connecting part 56 are provided. The housing connection portion 56 includes a pair of short side portions 56a extending in the short axis direction of the housing 11 and a pair of long side portions 56b extending in the long axis direction of the housing 11, and each connecting arm portion. 55 is connected to the short side part 56a.

  The connecting arm portion 55 is a flat belt-like member, but can exhibit flexibility when the planar shape is curved in an approximately S shape, and is connected to the bobbin connecting portion 51. It can be expanded and contracted between the end portion and the end portion connected to the short side portion 56 a of the housing connection portion 56. Accordingly, the bobbin 44 connected to the bobbin connecting portion 51 can move in the sound emission direction together with the voice coil 43 and the diaphragm 46. Thereby, the diaphragm 46 can vibrate without being restrained.

  Note that a guide piece 54 for guiding the cord 52 and a fixing piece 54 a for fixing the cord 52 are formed on the sound emitting side surface of the damper 50. As a result, the cord 52 is held on the sound emission side surface of the damper 50. The guide piece 54 and the fixed piece 54a can be omitted as appropriate.

  A rear space 21 that functions as an acoustic space is formed on the side opposite to the sound emission side from the diaphragm 46 inside the housing 11. The rear space 21 is defined by the side plate portion 12, the rear plate portion 13, the end plate portion 35, the partition plate portion 37, the magnetic circuit support convex side portion 17 a, the diaphragm 46, the bobbin 44, and the magnetic circuit portion 40. It is space. Therefore, the housing 11 functions as an enclosure and can fully exhibit the performance of the speaker device 10.

  In addition, the both sides in the long axis direction of the partition plate portion 37 in the rear space 21 are recessed more to the sound emission side than the sound emission side surface of the plate 42 that is the sound emission side surface of the magnetic circuit portion 40. A recessed space 21a is formed. The recessed space 21 a is a space corresponding to the internal space of the magnetic circuit support convex portion 17. As described above, since the surface on the anti-sound side of the magnetic circuit portion 40 is substantially flush with the surface on the anti-sound side of the rear plate portion 13, the depth of the recessed space 21a, that is, The dimension of the recessed space 21a in the sound emission direction is substantially equal to the dimension of the magnetic circuit portion 40 in the thickness direction.

  Thus, by forming the pair of recessed spaces 21a, the volume of the rear space 21 that functions as an acoustic space on the side opposite to the sound emission side from the diaphragm 46 can be increased. Therefore, even if the overall external dimensions of the speaker device 10 are small, the volume of the housing 11 as an enclosure, that is, the volume of the rear space 21 that functions as an acoustic space can be increased. High sound can be reproduced, sound reproducibility is improved, and sound quality is improved.

  Furthermore, in the present embodiment, a sound quality adjustment hole 15a formed in the rear plate portion 13 is provided in at least one of the pair of recessed spaces 21a.

In a speaker device having an enclosure, the volume V (unit: liter) of the enclosure is expressed by the following equation (1).
V = (355 × a ⁴ ) / (α × f ² × m) (1)
Here, a is the equivalent radius of the diaphragm area (unit: cm), α is a coefficient, f is the lowest resonance frequency (unit: Hz), and m is the mass of the vibration system (unit: g). In addition, in a speaker having a sound quality adjustment hole formed in the enclosure, the recommended value of the coefficient α is 0.5 or more.

  In the prototype of the speaker device 10 according to the present embodiment manufactured by the inventor of the present invention, V is 0.0223 liters, a is 2.3 [cm], f is 240 [Hz], and m is 1.8 [ g]. When these values are substituted into the equation (1), the coefficient α is 4.3.

  Therefore, in the speaker device 10 according to the present embodiment, it can be seen that the coefficient α is within the recommended value range, and good sound reproducibility and sound quality can be obtained.

  In the example shown in the figure, only the right recessed space 21a in FIG. 2B has the sound quality adjusting hole 15a, but only the left recessed space 21a has the sound quality adjusting hole 15a. Alternatively, the recessed spaces 21a on both the left and right sides may be provided with a sound quality adjusting hole 15a.

  In the example shown in the figure, the shape of the sound quality adjustment hole 15a is substantially T-shaped, but the shape is not limited to a substantially T-shape, and may be any shape. . The area of the sound quality adjustment hole 15a can also be set as appropriate.

  Thereby, the rear space 21 that functions as an enclosure communicates with the outside through the sound quality adjustment hole 15a. Therefore, the sound pressure in various frequency bands can be controlled by adjusting the length, cross-sectional shape, cross-sectional size, etc. of the sound quality adjusting hole 15a. In particular, the sound quality in a low frequency band can be improved.

  Thus, in the present embodiment, the speaker device 10 includes the diaphragm 46, the driver unit that vibrates the diaphragm 46, and the housing 11 that functions as an enclosure that covers the anti-sound side of the diaphragm 46, The diaphragm 46 and the housing 11 have a narrow and narrow planar shape when viewed from the sound emission side, and the driver unit includes a magnetic circuit unit 40 and a voice coil that generates vibration in cooperation with the magnetic circuit unit 40. 43 and a bobbin 44 that transmits the vibration of the voice coil 43 to the diaphragm 46, the magnetic circuit unit 40 is held by the housing 11 on the outer side of the housing 11 and on the side opposite to the sound emission, and the bobbin 44 is placed on the inner side of the housing 11. The housing 11 is held by the housing 11 so as to be movable in the sound emission direction. The housing 11 has a magnetic circuit housing recess 34 for housing the magnetic circuit portion 40, and the magnetic circuit housing recess 3. Are formed in the magnetic circuit support convex portion 17 and protruded from the surface on the sound emission side of the magnetic circuit portion 40 into the sound emission side. It is a member formed integrally with the recessed space 21a.

  As a result, the driver unit and the diaphragm 46 can be held only by the integrally formed housing 11 without using a separate member such as a frame, the number of parts can be reduced, and the assembly can be facilitated. The cost can be reduced. In addition, since the housing 11 formed integrally covers the sound emitting side of the diaphragm 46, the function as an enclosure is improved, and even if a narrow and narrow shape is adopted, sound reproducibility is good. The speaker device 10 with high sound quality can be provided. Furthermore, since the recessed space 21a is recessed from the sound emitting side surface of the magnetic circuit unit 40 to the opposite sound emitting side, even if the size of the speaker device 10 in the sound emitting direction is reduced and the size is reduced, it serves as an enclosure. The volume of the housing 11 can be increased, a sharp bass and a clear middle / high tone can be reproduced, sound reproducibility is improved, and sound quality is improved.

  Further, the surface on the side opposite to the sound emission side of the magnetic circuit support convex portion 17 and the surface on the side opposite to the sound emission side of the magnetic circuit portion 40 are substantially flush with each other. Therefore, even if the size of the speaker device 10 in the sound emitting direction is reduced and the size is reduced, the size of the recessed space 21a in the sound emitting direction can be increased.

  Furthermore, at least one of the recessed spaces 21a includes a communication passage 15 that communicates with the outside. Thereby, the sound pressure in various frequency bands can be controlled, and in particular, the sound quality in a low frequency band can be improved.

  Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol. The description of the same operation and the same effect as those of the first embodiment is also omitted.

  FIG. 5 is a three-side view of the speaker device according to the second embodiment of the present invention. In the drawings, (a) is a plan view, (b) is a side view, and (c) is a cross-sectional view taken along line BB in (a).

  In the present embodiment, at least one of the pair of recessed spaces 21a includes a communication passage 15 that functions as a duct. The communication passage 15 extends in the direction orthogonal to the sound emission direction at the end opposite to the sound emission side in the recessed space 21 a, specifically, in the long axis direction of the housing 11. The sound quality adjustment hole 15 a is formed on the side surface of the magnetic circuit support convex portion 17, specifically, the side surface of the end plate portion 35. The shape of the sound quality adjustment hole 15a is substantially rectangular.

  Regarding the configuration of other points, for example, the shape or size of each part such as the attachment part 35a is different from that of the first embodiment, but is substantially the same as that of the first embodiment. The description is omitted.

  In the prototype of the speaker device 10 according to the present embodiment produced by the inventor of the present invention, V is 0.0114 liter, a is 1.93 [cm], f is 210 [Hz], and m is 0.8. It was 7 [g]. When these values are substituted into the equation (1), the coefficient α is 14.0.

  Therefore, it can be seen that also in the speaker device 10 according to the present embodiment, the coefficient α is within the recommended value range, and good sound reproducibility and sound quality can be obtained.

  As described above, in the present embodiment, the communication path 15 functioning as a duct extends in a direction orthogonal to the sound emission direction, and the sound quality adjustment hole 15a which is the outer end of the communication path 15 is formed on the magnetic circuit support convex portion 17. Open on the side.

  Thereby, the length, cross-sectional shape, cross-sectional size, etc. of the communication path 15 and the sound quality adjusting hole 15a can be adjusted, and the sound pressure in various frequency bands can be controlled.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

  The present invention can be applied to a speaker device.

DESCRIPTION OF SYMBOLS 10 Speaker apparatus 11 Housing 12 Side board part 13 Back board part 15,815 Communication path 15a Sound quality adjustment hole 16 Front board part 16a Diaphragm accommodation opening part 16b Peripheral part 17 Magnetic circuit support convex part 17a Magnetic circuit support convex side part 18 Magnetic circuit Fixed member 18a Magnetic circuit fixing member receiving recess 21, 821 Rear space 21a Recessed space 34 Magnetic circuit receiving recess 35 End plate portion 35a Mounting portion 35b Fixing plate portion 35c Mounting opening portion 36 Coil passage opening portion 37 Partition plate portion 37a Damper connection Part 40 Magnetic circuit part 41, 841 Magnet 41a, 42a Center hole 42, 842 Plate 43 Voice coil 44 Bobbin 45 Dust cap 46, 846 Diaphragm 46a Central opening 46b Diaphragm edge 46c Gasket part 48, 834 Yoke 48a Central pillar 50 Damper 51 Bobbin connection 52 Code 5 Terminal 54 guide piece 54a fixed piece 55 connecting arm portion 56 housing the connecting portion 56a short side portion 56b long side 811 frame 812 side wall 816 front plate 817 the magnetic circuit supporting portion 826 the cap member 833 for sealing the cover 843 coil

Claims (5)

(A) A speaker device having a diaphragm, a driver unit that vibrates the diaphragm, and a housing that functions as an enclosure that covers an anti-sound side of the diaphragm,
(B) The diaphragm and the housing have a narrow and narrow planar shape when viewed from the sound emission side,
(C) The driver unit includes a magnetic circuit unit, a driving member that generates vibration in cooperation with the magnetic circuit unit, and a vibration transmission member that transmits the vibration of the driving member to the diaphragm, The magnetic circuit unit is held in the casing on the outer side and on the side opposite to the sound emission side, and the vibration transmission member is held in the casing so as to be movable in the sound emission direction on the inner side of the casing.
(D) The casing is formed with a recess for accommodating the magnetic circuit portion, a convex portion projecting toward the opposite sound emission side on both sides of the concave portion, and a sound emission of the magnetic circuit portion. And a recessed space that is recessed from the surface on the opposite side to the sound emission side. 2. The speaker device according to claim 1, wherein a surface on the side opposite to the sound emission side of the convex portion is substantially flush with a surface on the side opposite to the sound emission side of the magnetic circuit portion. The speaker device according to claim 1 or 2, wherein at least one of the recessed spaces includes an opening communicating with the outside. The speaker device according to claim 3, wherein the opening is opened on a surface of the convex portion on the side opposite to the sound emission side. The speaker device according to claim 3, wherein the opening is connected to the recessed space by a duct extending in a direction orthogonal to the sound emitting direction, and opens to a side surface of the convex portion.

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