JP2008092260A - Speaker apparatus and portable device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker apparatus which equalizes a width of magnetic gap, and also is thinned and reduced in size. <P>SOLUTION: The speaker apparatus has a frame and a magnetic circuit. The magnetic circuit has a first pair of plates which face each other, a pair of magnets which are arranged facing each other on the plate surfaces and have the facing magnet surfaces with different polarities, and a second pair of plates which face each other on the each surface. A first and a second magnetic gaps are respectively formed between a pair of the first and the second plates, and an outer wall of the magnetic circuit is attached on an interior side face of the frame with adhesive. Even if suction force by magnetic force occurs between a pair of magnets, etc., therefore, a frame is prevented from being pulled inside and deformed, by existence of a spacer, and the first and the second magnetic gaps are held in a fixed width. According to the method, thinning and downsizing of the speaker apparatus are attained since thickness of the frame is made smaller. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a speaker device that can be suitably used for a portable device or the like.

  2. Description of the Related Art Conventionally, a riffel type speaker having a rectangular diaphragm and configured by arranging a linear voice coil at the center of the diaphragm is known. For example, Patent Document 1 describes a speaker having this type of configuration.

  The speaker described in Patent Document 1 includes two upper and lower magnetic circuits provided with magnetic gaps that are parallel and have opposite magnetic flux directions, a U-shaped frame coupled to the magnetic circuits, and a voice coil at the center. The diaphragm is coupled to the upper portion of the voice coil and has an outer periphery coupled to the frame or the like, and a damper having a substantially center coupled to the lower portion of the voice coil and an outer periphery coupled to the frame or the like. With such a configuration, even if an elongated structure with a narrow aperture and width is adopted, the lowest resonance frequency f0 can be lowered, and input resistance, bass reproduction, and improvement of sound pressure frequency characteristics can be achieved.

Japanese Patent Laid-Open No. 11-187484

  Here, in the loudspeaker described in Patent Document 1, the magnets provided in the pair of magnetic circuits are arranged so as to face each other. At this time, the faces of the facing magnets have different polarities. The pair of magnetic circuits are attached to the inner surface of the frame. For this reason, in such a speaker, a mutual attractive force (attractive force due to the magnetic force generated between them) is generated between the pair of magnetic circuits, and the frame is pulled inward and deformed. There is a problem that it is difficult to keep the gap uniform.

  In order to solve such a problem, the thickness of the frame to which the pair of magnetic circuits is attached is increased to increase the rigidity of the frame itself, and the strength is sufficient to withstand the attraction force generated between the pair of magnetic circuits. Must be held in the frame. However, if such a structure is adopted, it is inevitable that the speaker itself will increase in size as the thickness of the frame increases.

  In particular, in recent years, a speaker mounted on a portable device or the like has been required to be thin and small, and adopting such a structure results in a reversal of such a requirement. Further, when the speaker is made thinner and smaller, it is necessary to attach the magnetic circuit to the frame or the like at a predetermined position with high accuracy.

  On the other hand, for example, by aligning the side surface of the plate or magnet with the side surface of the frame, the width of the magnetic gap (the width of the magnetic gap is defined as the length of the magnetic gap in the direction of the magnetic flux passing through the voice coil). Is stipulated. Due to the demands of manufacturers such as portable devices, it is beginning to be necessary to make the frame itself thin or small. With the magnetic gap setting method, it is becoming difficult to set a magnetic gap having a small width. Therefore, an effective method for defining the magnetic gap has been demanded.

  Examples of problems to be solved by the present invention include the above. The present invention makes it possible to make the magnetic gap uniform, to set the width of the magnetic gap uniformly along the direction in which the voice coil extends, to define a narrow magnetic gap, etc., and to make it thinner and smaller It is an object of the present invention to provide a speaker device capable of achieving the above and a portable device using the speaker device.

  The invention according to claim 1 is a speaker device comprising a frame and a magnetic circuit, wherein the magnetic circuit is a pair of first plates opposed to each other with a certain gap, and the pair of first plates. A pair of magnets arranged opposite to each other with a certain gap and having opposite polarities on opposite surfaces, and a pair of magnets in contact with the frame and arranged to face each other with a certain gap on the pair of magnets A first magnetic gap is formed in the gap between the pair of first plates, and a second magnetic is formed in the gap between the pair of second plates. A gap is formed, and a spacer is interposed in at least one of the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates. Characterized in that it is.

  In one embodiment of the present invention, a speaker device includes a frame and a magnetic circuit, and the magnetic circuit is disposed on a pair of first plates opposed to each other with a certain gap therebetween, and on the pair of first plates. A pair of magnets arranged opposite each other with a certain gap and having opposite polarities on opposite surfaces, and a pair of second magnets that are in contact with the frame and arranged opposite each other with a certain gap on the pair of magnets. A first magnetic gap is formed in the gap between the pair of first plates, and a second magnetic gap is formed in the gap between the pair of second plates. A spacer is interposed in at least one of the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates. It has been.

  The above speaker device includes a frame and a magnetic circuit. The magnetic circuit includes a pair of first plates opposed to each other with a certain gap, and a pair of first plates opposed to each other with a certain gap on each other. And a pair of second plates which are in contact with the frame and are opposed to each other with a certain gap on the pair of magnets. A first magnetic gap is formed in the gap between the pair of first plates, and a second magnetic gap is formed in the gap between the pair of second plates.

  In particular, a spacer is interposed in at least one of the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates. In other words, the spacer is sandwiched or sandwiched by at least one member of the pair of first plates, the pair of magnets, and the pair of second plates.

  In a preferred example, the spacer has a function of defining a width of the first magnetic gap and / or the second magnetic gap. The spacer located in the first magnetic gap has the same size (thickness) as the gap between the pair of first plates, and the spacer located in the gap between the pair of magnets. The spacer has the same size (thickness) as the gap, and the spacer located in the second magnetic gap has the same size (thickness) as the gap of the pair of second plates. ).

  Thereby, between one magnet and the other magnet, between one first plate and the other first plate, and between one second plate and the other second plate. In this case, even if a force attracting each other (attraction force due to the magnetic force generated between them) is generated, the frame is located inside (on the central axis side of the magnetic circuit) due to the presence of the spacer interposed in the gap between the at least one member. Can be prevented from being deformed by being pulled.

  Therefore, the first magnetic gap can be kept constant and the second magnetic gap can be kept constant. That is, since the gap between the pair of first plates, the gap between the pair of second plates, and the gap between the pair of magnets can be defined by the thickness of the spacer, the width of the first magnetic gap and the width of the second magnetic gap Even if it is necessary to reduce the width of the magnetic gap, the width of the magnetic gap can be defined by adjusting the thickness of the spacer. The relative distance between the first magnetic gap and the second magnetic gap may be the same or non-identical.

  Further, as described above, since the first magnetic gap and the second magnetic gap are set to have a constant width by the spacer, the first magnetic gap and the second magnetic gap are kept constant when the speaker device is assembled. It is not necessary to use a jig for setting the width, and accordingly, the number of assembling steps of the speaker device can be reduced.

  Further, with the adoption of such a configuration, it is not necessary to give the frame strength sufficient to withstand the suction force, so that it is not necessary to increase the thickness of the frame, in other words, the thickness of the frame can be reduced. Therefore, the speaker device can be reduced in thickness and size. Thereby, the speaker device can be suitably used as a micro speaker mounted on a portable device or the like.

  Further, if such a configuration is applied to a thin and small speaker device, a magnetic circuit can be accurately attached to a prescribed position of the frame, which can contribute to an improvement in sound quality.

  In a preferred example, the spacer is preferably formed integrally or independently with the frame. The spacer is preferably formed of a nonmagnetic material such as a resin material. Thereby, the magnetic flux generated in the magnetic circuit is less likely to leak to the spacer side, and the magnetic flux generated in the first and second magnetic gaps can be prevented from decreasing.

  In one aspect of the above speaker device, the spacer includes the gap on both ends of the pair of first plates, the gap on both ends of the pair of magnets, and both ends of the pair of second plates. The gap is interposed at a position corresponding to at least one of the gaps. Thereby, it becomes possible to arrange a voice coil and a diaphragm that supports the voice coil in the first and second magnetic gaps inside the at least one end.

  In another aspect of the speaker device described above, the first parallel portion extending in one direction and the direction parallel to the first parallel portion extend at a certain interval from the first parallel portion. A voice coil having a second parallel portion facing each other, and a diaphragm having an elongated shape and having a concave voice coil installation portion for installing the voice coil at a central position, The frame has an elongated shape and supports the outer peripheral portion of the diaphragm, and the pair of first plates, the pair of magnets, and the pair of second plates are each a rectangular parallelepiped shape or a square rod shape. And the first magnetic gap and the second magnetic gap have a linear shape, and the voice coil installation portion includes the gap between the pair of first plates and the gap between the pair of magnets. And the one The second plate is disposed at a position passing through the gap, the first parallel portion is located in the first magnetic gap, and the second parallel portion is located in the second magnetic gap. The outer walls of the pair of first plates, the pair of magnets, and the pair of second plates are attached to opposite inner surfaces of the frame via an adhesive. As a result, a thin, small, and elongated speaker device having two magnetic gaps can be configured.

  In still another aspect of the above speaker device, the speaker device includes a frame and a magnetic circuit, and the magnetic circuit has a pair of first plates opposed to each other with a certain gap, and a certain amount on the pair of first plates. A pair of magnets that are arranged to face each other with a gap and have opposite polarities, and a pair of second plates that are in contact with the frame and arranged to face each other with a certain gap on the pair of magnets And a first magnetic gap is formed in the gap between the pair of first plates, and a second magnetic gap is formed in the gap between the pair of second plates. A spacer is interposed in at least one of the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates. Frame has a substantially parallel sides to the plane of the magnet mutually the opposite, the side has an opening.

  In this aspect, in particular, the frame has side surfaces that are substantially parallel to the surfaces of the magnets facing each other, and the side surfaces have openings, so that a magnet or plate can be easily arranged in the frame. Easy assembly. Further, since it is not necessary to consider the thickness of the side surface of the frame, the thickness of the frame can be reduced, the speaker device can be further reduced in thickness, size and length, and the size of the magnet can be increased.

  In another embodiment of the present invention, a mobile device (for example, a mobile phone) including the above speaker device can be configured. Thereby, it can contribute to thickness reduction and size reduction of a portable apparatus.

  Various preferred embodiments of the present invention will be described below with reference to the drawings.

[First embodiment]
(Configuration of speaker device)
The configuration of the speaker device 100 according to the first embodiment of the present invention will be described with reference to FIGS.

  Fig.1 (a) shows the front view when the speaker apparatus 100 which concerns on 1st Example of this invention is observed from the radiation | emission direction of a sound. FIG. 1B shows a rear view of the speaker device 100. FIG. 1C shows a side view corresponding to the longitudinal direction of the speaker device 100. FIG. 2 is a cross-sectional view taken along a cutting line A-A ′ passing through the central axis L <b> 1 of the speaker device 100 in FIG.

  The speaker device 100 is suitably used as a speaker device for a portable device such as a mobile phone, and mainly includes a pair of first plates 1a and 1b, a pair of magnets 2a and 2b, a pair of second plates 3a and 3b, an internal magnet type magnetic circuit 30, a frame 4, a diaphragm 5, and a vibration system member 31 having a voice coil 6. In the following, when each magnet and each first or second plate are distinguished from each other, they are referred to as a magnet 2a or a first plate 1a, respectively. This is referred to as the first plate 1.

(Configuration of magnetic circuit)
The configuration of the magnetic circuit 30 is as follows.

  Each of the pair of first plates 1a and 1b has a rectangular parallelepiped shape and a square rod shape, and each of them is arranged in a state of facing each other with a certain gap d3. A first magnetic gap 70a having a constant gap d3 is formed between the pair of first plates 1a and 1b. In the first magnetic gap 70a, magnetic fluxes of a pair of magnets 2a and 2b described later are concentrated. The direction of the magnetic flux generated in the first magnetic gap 70a is set, for example, in the direction of the arrow Y2.

  Each of the pair of magnets 2a and 2b has a rectangular parallelepiped shape and a square rod shape, and each of them is opposed to each other with a certain gap d4 (> d3), and the pair of first plates 1a and 1b. It is attached to the upper surface of each of these via an adhesive. In the present invention, it is not essential that the gap between the pair of magnets 2a and 2b is d4 (> d3). Here, the relative polarities of the inner surface of one magnet 2a and the inner surface of the other magnet 2b opposite to the inner surface are set to be opposite to each other. That is, although not shown, when the polarity of the inner surface of one magnet 2a is the S pole (or N pole), the polarity of the inner surface of the other magnet 2b facing it is the N pole (or S pole). Is set to

  Each of the pair of second plates 3a and 3b has a rectangular parallelepiped shape and a square rod shape, and each of them faces the upper surface of each of the pair of magnets 2a and 2b with a predetermined gap d3 therebetween. It is attached via an adhesive. A second magnetic gap 70b having a constant gap d3 is formed between the pair of second plates 3a and 3b. The magnetic flux of the pair of magnets 2a and 2b is concentrated in the second magnetic gap 70b. The direction of the magnetic flux generated in the second magnetic gap 70b is set in the direction of the arrow Y3 that is relatively opposite to the direction of the magnetic flux generated in the first magnetic gap 70a, and the second magnetic gap 70b The magnitude of the magnetic force generated in the first magnetic gap 70a is set to be relatively the same.

(Configuration of vibration system members)
The configuration of the vibration system member 31 is as follows.

  The frame 4 is formed in an elongated shape having an upper surface having an annular shape and a side surface at a position continuous with the upper surface. The frame 4 is preferably formed of a resin material that can be easily molded. Further, on the side surfaces 4s on both ends in the longitudinal direction of the frame 4, a pair of first plates 1a and 1b, a pair of magnets 2a and 2b, and a pair of second plates 3a and Each outer wall (outer surface) of 3b is attached via an adhesive, and the side surface 4s of the frame 4 has a role of supporting these members.

  The diaphragm 5 has an oval or elliptical planar shape. In addition, the diaphragm 5 has a concave shape, is disposed at the center position in the short side direction, and is provided so as to extend in the longitudinal direction, and the voice coil setting portion. 51, a sound emitting part 52 having a semicircular cross-sectional shape and serving to emit sound waves, and provided outside the sound emitting part 52 and attached to the upper end side of the frame 4 And an attachment portion 53.

  The voice coil installation portion 51 includes a voice coil support portion 51a that supports the voice coil 6, and a bulge portion 51b that is provided at a position connected to and connected to the voice coil support portion 51a.

  As shown in FIG. 2, in a state where the diaphragm 5 is attached to the frame 4, the voice coil installation part 51 is parallel to the directions substantially perpendicular to the arrow Y <b> 2 direction and the arrow Y <b> 3 direction that are the magnetic flux extending directions. It extends to. The depth of the voice coil installation portion 51 is substantially the same as the distance from the vicinity of the back side of the pair of first plates 1 a and 1 b to the vicinity of the upper end portion of the frame 4. And the voice coil installation part 51 is arrange | positioned in the approximate center position in the magnetic circuit 30. FIG. Thereby, the speaker device 100 is reduced in thickness and slim.

  The voice coil support portion 51a has an elongated shape and a bag-like or U-shaped cross-sectional shape, and has a gap with a certain width in a direction substantially orthogonal to the extending direction thereof, that is, the short direction of the diaphragm 5, The gap forms a rectangular parallelepiped space. The width of the gap (the width of the gap is the length of the gap in the direction of the magnetic flux passing through the voice coil) is preferably set as narrow as possible in order to increase the magnetic flux density. For example, it is set to about 0.2 mm. As shown in FIG. 2, the voice coil 6 is fixed in a state of being sandwiched between the inner surfaces of the voice coil support portion 51 a, and the voice coil support portion 51 a mainly plays a role of supporting the voice coil 6.

  The bulge portion 51b has a gap larger than the gap of the voice coil support portion 51a, and the gap of the bulge portion 51b forms a cylindrical space. The bulge portions 51b are provided at regular intervals in the longitudinal direction of the diaphragm 5, that is, the extending direction of the voice coil installation portion 51.

  The voice coil 6 has one plus / minus lead wire (not shown), is wound to form an oval and annular (ring-shaped) planar shape, and extends in one direction. A first parallel portion 6a, a second parallel portion 6b that is disposed opposite to the first parallel portion 6a with a certain gap 6d and extends in a direction parallel to the first parallel portion 6a, A connecting portion (not shown) that connects each end portion of the first parallel portion 6a and each corresponding end portion of the second parallel portion 6b, and is disposed in the voice coil installation portion 51 of the diaphragm 5; Is done. The first parallel portion 6a is located in the first magnetic gap 70a, and the second parallel portion 6b is located in the second magnetic gap 70b. Here, the positive lead wire of the voice coil 6 is an input wiring for an L (or R) channel signal, and the negative lead wire is an input wiring for a ground (GND) signal. Each lead wire is electrically connected to each output wiring on the amplifier side (not shown). For this reason, a signal and power (hereinafter also simply referred to as “voice current”) are input to the voice coil 6 from the amplifier side through the respective lead wires. In the voice coil 6 having such a configuration, since the audio current flows so as to circulate, the direction of the audio current flowing through the first parallel portion 6a and the direction of the audio current flowing through the second parallel portion 6b are relative to each other. The opposite is true.

  In the speaker device 100 described above, the audio current output from the amplifier side is input to the voice coil 6 through each lead wire of the voice coil 6. Thereby, a driving force is generated in the first parallel part 6a and the second parallel part 6b of the voice coil 6 in the first magnetic gap 70a and the second magnetic gap 70b, respectively. Here, the magnitude of the magnetic force generated in the first magnetic gap 70a and the magnitude of the magnetic force generated in the second magnetic gap 70b are set to the same magnitude as described above, and Audio currents of the same magnitude flow in the opposite directions in the parallel part 6a and the second parallel part 6b. For this reason, the first parallel part 6a and the second parallel part 6b vibrate in the same direction with the same driving force based on Fleming's left-hand rule. Specifically, the first parallel portion 6a is based on a straight line L2 passing through the center in the thickness direction of the pair of first plates 1a and 1b, and the second parallel portion 6b is a pair of second plates. With reference to a straight line L3 passing through the center of the thickness direction of 3a and 3b, the speaker device 100 vibrates in the same direction and with the same driving force in the central axis L1 direction. Thus, the speaker device 100 radiates sound waves in the arrow Y1 direction through the sound emitting unit 52 of the diaphragm 5.

(Frame structure)
Next, the configuration of the frame 4 according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a cross-sectional view of the speaker device 100 taken along a cutting line B-B ′ in FIG. 1B, and is particularly a cross-sectional view cut at a position passing through the spacer 4 a that is an element of the frame 4.

  Although the basic configuration of the frame 4 is as described above, in the first embodiment, the frame 4 is particularly arranged at both ends of the voice coil installation portion 51 of the diaphragm 5 and both ends of the magnetic circuit 30 in the longitudinal direction. The vibration plate 5 has a position corresponding to each of the gap between the pair of first plates 1a and 1b, the gap between the pair of magnets 2a and 2b, and the gap between the pair of second plates 3a and 3b. The first magnetic gap is interposed between the pair of first plates 1a and 1b and the pair of second plates 3a and 3b so as to penetrate in the vibration direction (center axis L1 direction). It is characterized in that a spacer 4a having a thickness d3 is provided, which defines 70a and the second magnetic gap 70b as a constant gap d3. In particular, the side surface of the frame 4 that is in contact with the first plates 1a and 1b, the magnets 2a and 2b, and the second plates 3a and 3b corresponding to the short direction of the frame 4 is not formed. Instead, an opening 4h is formed.

  Here, focusing on each of the pair of magnets 2a and 2b, the pair of first plates 1a and 1b, and the pair of second plates 3a and 3b, one magnet 2a and the other magnet 2b, The one first plate 1a and the other first plate 1b, and the one second plate 3a and the other second plate 3b face each other with different polarities. Arranged in a state. Therefore, in FIG. 3, if it is assumed that the speaker device 100 is not provided with the spacer 4a, it is between the one magnet 2a and the other magnet 2b, and between the one first plate 1a and the other one. Between the first plate 1b and between the one second plate 3a and the other second plate 3b, a force attracting each other (attraction force due to the magnetic force generated between them) is generated, so that the frame 4 There is a problem that it is difficult to hold the gap d3 between the first magnetic gap 70a and the second magnetic gap 70b uniformly because it is pulled and deformed inside (the central axis L1 side of the speaker device 100). . Moreover, when such a configuration is adopted, the above-described problems may occur in addition to the above problems.

  Therefore, in order to solve such a problem, in the first embodiment, in the speaker device 100, the same thickness as the gap d3 between the first magnetic gap 70a and the second magnetic gap 70b is set at the predetermined position described above. The spacer 4a is interposed and sandwiched. That is, the spacer 4a has a function of defining the width of the first magnetic gap 70a and / or the second magnetic gap 70b. Thereby, between one magnet 2a and the other magnet 2b, between one first plate 1a and the other first plate 1b, and one second plate 3a and the other first plate 1b. Even if a mutual attractive force (attractive force due to the magnetic force generated between them) is generated between the two plates 3b, the frame 4 is located inside (speaker device 100) due to the presence of the spacer 4a interposed in the gap between them. Can be prevented from being deformed by being pulled to the center axis L1 side), and it is also possible to prevent the magnetic circuit 30 from being detached from the frame 4 due to the peeling of the adhesive between the frame 4 and the magnetic circuit 30. it can.

  Therefore, the first magnetic gap 70a and the second magnetic gap 70b can be held at a constant width d3. That is, the gap between the pair of first plates 1, the gap between the pair of second plates 3, and the gap between the pair of magnets 2 can be defined by the thickness of the spacer 4a. Even if it is necessary to reduce the width of the magnetic gap 70b, it is possible to define the width of the magnetic gap by adjusting the thickness of the spacer 4a.

  Further, by forming the opening 4 h on the side surface of the frame 4 that is substantially parallel to the surface of the opposing magnet 2, the magnet 2, the first plate 1, and the second plate 3 can be easily placed in the frame 4. Assembling of the speaker device 100 can be facilitated. In addition, since it is not necessary to consider the thickness of the side surface of the frame 4, the thickness of the frame 4 can be reduced, the speaker device 100 can be further thinned, downsized and elongated, and the size of the magnet 2 can be increased. Can be mentioned.

  Further, as described above, since the first magnetic gap 70a and the second magnetic gap 70b are set to the constant gap d3 by the thickness d3 of the spacer 4a, when the speaker device 100 is assembled, the first magnetic gap is set. It is not necessary to use a jig for setting the 70a and the second magnetic gap 70b to the fixed gap d3, and accordingly, the number of assembling steps of the speaker device 100 can be reduced.

  In addition, since it is not necessary to give the frame 4 strength enough to withstand the suction force with the use of such a configuration, it is not necessary to increase the thickness of the frame 4, in other words, the thickness of the frame 4. Therefore, the thickness d1 of the speaker device 100 and the width d2 of the speaker device 100 can be reduced, and the speaker device 100 can be reduced in thickness and size. Thereby, the speaker device 100 can be suitably used as a micro speaker mounted on a portable device or the like.

  Further, if such a configuration is applied to a thin and small speaker device, the magnetic circuit 30 can be accurately attached to a prescribed position of the frame 4, which can contribute to an improvement in sound quality.

  The spacer 4a is preferably formed of a nonmagnetic material such as a resin material. Thereby, the magnetic flux generated in the magnetic circuit 30 is difficult to leak to the spacer 4a side, and it is possible to prevent the magnetic flux generated in the first magnetic gap 70a and the second magnetic gap 70b from being lowered.

[Second Embodiment]
Next, the configuration of the speaker device 200 according to the second embodiment of the present invention will be described. In the following, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 4A is a cross-sectional view of the speaker device 200 according to the second embodiment corresponding to FIG.

  The second embodiment is different from the first embodiment in the setting position and shape of the spacer 4a provided on the frame 4.

  That is, in the second embodiment, the spacer 4a that defines the first magnetic gap 70a and the second magnetic gap 70b as a constant gap d3 has the same thickness as the gap d4 (> d3) between the pair of magnets 2a and 2b. At positions corresponding to both ends of the voice coil installation portion 51 of the diaphragm 5 and both ends of the magnetic circuit 30 in the longitudinal direction, corresponding to the gap between the pair of magnets 2a and 2b. Are only interposed and sandwiched. As a result, the frame 4 can be prevented from being deformed, the magnetic circuit 30 can be prevented from being detached from the frame 4 based on the action of the spacer 4a in substantially the same manner as in the first embodiment, and the first magnetic gap 70a and the second magnetic gap 70a can be prevented. The magnetic gap 70b can be held in the constant gap d3. In addition, in 2nd Example, the effect similar to above-mentioned 1st Example can be acquired.

[Third embodiment]
Next, the configuration of the speaker device 300 according to the third embodiment of the present invention will be described. In the following, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 4B is a cross-sectional view of the speaker device 300 according to the third embodiment corresponding to FIG.

  The third embodiment differs from the first embodiment in the setting position and shape of the spacers 4a provided on the frame 4.

  That is, in the third embodiment, the spacer 4a that defines the first magnetic gap 70a and the second magnetic gap 70b as a constant gap d3 has a cross-shaped cross section, and the voice coil installation portion of the diaphragm 5 51, positions corresponding to both ends of the magnetic circuit 30 and both ends of the magnetic circuit 30 in the longitudinal direction, a gap between the pair of first plates 1a and 1b, a gap between the pair of magnets 2a and 2b, and a pair The second plates 3a and 3b are interposed so as to penetrate in the vibration direction of the diaphragm 5 (the direction of the central axis L1), respectively, and the pair of first plates 1a and 1b and the pair of magnets 2a and 2b. And a pair of second plates 3a and 3b. In addition, the thickness of the portion of the spacer 4a located in each of the first magnetic gap 70a and the second magnetic gap 70b is defined to the same value as the gap d3 of the first magnetic gap 70a, and The thickness of the other part of the spacer 4a located between the pair of magnets 2a and 2b is defined by a gap d4 (> d3) between the pair of magnets 2a and 2b. Thereby, the deformation of the frame 4 can be prevented based on the action of the spacer 4a in substantially the same manner as in the first embodiment, and the pair of first plates 1a and 1b with respect to the pair of magnets 2a and 2b. In addition, the positional displacement of the pair of second plates 3a and 3b can be prevented, and the same effect as that of the first embodiment can be obtained. In addition, in 3rd Example, the effect similar to above-mentioned 1st Example can be acquired.

[Modification 1]
Next, with reference to FIG. 5, the structure of the speaker apparatus 400 which concerns on the modification 1 of this invention is demonstrated. In the following, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 5 is a cross-sectional view of the speaker device 400 according to the first modification, corresponding to FIG.

  In the first modification, the number and shape of the first plates provided below the pair of magnets 2a and 2b in the magnetic circuit 30x, the setting position of the spacer 4a, and the like are different from the first embodiment. Further, the first modification is different from the first embodiment in that one magnetic gap 70x is provided only between the pair of second plates 2a and 2b. That is, in the first modification, the present invention is applied to the speaker device 400 having one magnetic gap 70x.

  Specifically, in the first modification, the configuration of the first embodiment is applied as a basic configuration, and instead of providing a pair of first plates 1a and 1b, a flat or rectangular parallelepiped shape is provided. One first plate 1x is provided on the bottom side of the pair of magnets 2a and 2b. The spacer 4a has the same thickness as the gap d3 of one magnetic gap 70x, and corresponds to both ends of the voice coil installation portion 51 of the diaphragm 5 and both ends of the magnetic circuit 30 in the longitudinal direction. And a gap between the pair of magnets 2a and 2b and a gap between the pair of second plates 3a and 3b so as to penetrate in the vibration direction of the diaphragm 5 (direction of the central axis L1). Between the second plates 3a and 3b. Thereby, the deformation of the frame 4 can be prevented based on the action of the spacer 4a in substantially the same manner as in the first embodiment, and the same action and effect as in the first embodiment can be obtained. In addition, in the first modification, the same effects as those in the first embodiment can be obtained.

[Modification 2]
Next, the configuration of the speaker device 500 according to the second modification of the present invention will be described with reference to FIGS. 6 and 7A. In the following, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 6A shows a rear view of the speaker device 500 according to the second modification corresponding to FIG. FIG. 6B is a perspective view of the reinforcing member 7 that defines the first magnetic gap 70a and the second magnetic gap 70b as a constant gap d3. FIG. 7A shows a cross-sectional view of the speaker device 500 according to the modified example 2 taken along the cutting line C-C ′ of FIG.

  In the second modification, the magnetic circuit 30 according to the first embodiment is applied, and instead of providing the spacer 4a, the first magnetic gap 70a and the second magnetic gap 70a are formed on the bottom surfaces of the pair of first plates 1a and 1b. The reinforcing member 7 is provided to define the magnetic gap 70b as a constant gap d3. For example, the reinforcing member 7 is attached to the bottom surfaces of the pair of first plates 1a and 1b via an adhesive.

  Here, the reinforcing member 7 has a flat plate shape or a rectangular parallelepiped shape, and includes an opening 7 a having a shape similar to the planar shape of the voice coil installation portion 51. The opening 7a is provided in the reinforcing member 7 at a position corresponding to the voice coil installation portion 51 and at a position corresponding to each of the first magnetic gap 70a and the second magnetic gap 70b. Here, the reinforcing member 7 is preferably formed of a non-magnetic material for the reason described later.

  In Modification 2 having the above-described configuration, between one magnet 2a and the other magnet 2b, between one first plate 1a and the other first plate 1b, and one second Reinforcing member attached to the lower surface side of the magnetic circuit 30 even if a mutual attractive force (attractive force due to the magnetic force generated between them) is generated between the plate 3a and the other second plate 3b. 7, the frame 4 can be prevented from being deformed by being pulled inward (on the central axis L1 side of the speaker device 100), and the adhesive 4 is peeled off between the frame 4 and the magnetic circuit 30 to cause magnetism. It is possible to prevent the circuit 30 from being detached from the frame 4. Therefore, the first magnetic gap 70a and the second magnetic gap 70b can be held in the constant gap d3.

  Moreover, in the modification 2, since the reinforcement member 7 has the structure attached to the bottom face of a pair of 1st plates 1a and 1b via the adhesive agent, the intensity | strength which can bear the said attraction | suction force to flame | frame 4 itself. It is not necessary to have. Therefore, since the thickness of the frame 4 can be reduced, the speaker device 500 can be reduced in thickness and size. Thus, the speaker device 500 can be suitably used as a micro speaker mounted on a portable device or the like.

  Further, in the speaker device 500 according to the modified example 2, the reinforcing member 7 is provided with the opening 7a at a position corresponding to the first magnetic gap 70a and the like. For this reason, since the space formed between the diaphragm 5 and the frame 4 and the magnetic circuit 30 is not sealed, the diaphragm 5 easily vibrates and the compliance can be reduced. Further, after assembly of the speaker device 500, it is possible to inject magnetic fluid into the first magnetic gap 70a, for example, from the back side of the speaker device 500 through the opening 7a. As a result, the portion of the diaphragm 5 positioned in the first magnetic gap 70a can be elastically held at a specified position in the first magnetic gap 70a, and rolling can be prevented. .

  In addition, by forming the reinforcing member 7 with a non-magnetic material, the magnetic flux generated in the magnetic circuit 30 is less likely to leak to the reinforcing member 7 side, and the first magnetic gap 70a and the second magnetic gap 70b are not leaked. It is possible to prevent a decrease in the magnetic flux density generated in each of them, and to stably support the magnetic circuit 30 as a reinforcing member of the frame 4. In addition, in the second modification, the same effects as those in the first embodiment can be obtained.

[Modification 3]
Next, with reference to FIG.7 (b), the structure of the speaker apparatus 600 which concerns on the modification 3 of this invention is demonstrated. In the following, the same elements as those of the modification 2 are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG.7 (b) is sectional drawing of the speaker apparatus 600 which concerns on the modification 3 corresponding to Fig.7 (a).

  When the modification 3 and the modification 2 are compared, the setting positions of the reinforcing member 7 in the speaker device 600 are different from each other, and the other points are the same.

  That is, in Modification 3, the reinforcing member 7 is attached to the upper surfaces (top surfaces) of the pair of second plates 3a and 3b via an adhesive, for example. As a result, the deformation of the frame 4 and the separation of the magnetic circuit 30 from the frame 4 can be prevented and the first magnetic gap 70a and the second The magnetic gap 70b can be held in the constant gap d3. In addition, in the third modification, the same operational effects as in the second modification can be obtained.

[Other variations]
In the various embodiments and modifications described above, the spacer 4a is formed integrally with the frame 4. However, the present invention is not limited to this, and in the present invention, the spacer 4a is formed by a member independent of the frame 4. It doesn't matter.

  In the present invention, in the above-described various embodiments, modifications, and other configurations, the frame 4 has a side surface 4s parallel to the surface of the magnet 4 facing each other as shown in FIGS. You may have. Here, FIG. 8A is a front view of a speaker device 700 according to another modification corresponding to FIG. FIG. 8B is a rear view of a speaker device 700 according to another modification corresponding to FIG. FIG.8 (c) is a side view of the speaker apparatus 700 which concerns on the other modification corresponding to FIG.1 (c). FIG. 9 is a cross-sectional view taken along a cutting line D-D ′ passing through the central axis L <b> 1 of the speaker device 700 in FIG.

  In the example of the speaker device 700, the outer walls (outer surfaces) of the first plate 1, the magnet 2, and the second plate 3 are on the same surface, and the opposite side surfaces (inner surfaces) of the frame 4 through an adhesive. Side) It is clamped and attached to 4s. According to this configuration, the magnetic circuit 30 can be inserted in the direction of the arrow Y1 from the opening on the back side of the frame 4, and there is an advantage that the magnetic circuit 30 can be easily attached to the frame 4.

  In addition, in the present invention, it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[Example of application to mobile phones]
Next, an example in which the speaker device 100 (or any of the speaker devices 200 to 700, the same applies hereinafter) according to the first embodiment of the present invention is applied to a receiving unit and a receiving unit in a mobile phone will be described.

  FIG. 10 is a schematic plan view showing the configuration of this mobile phone. The mobile phone 800 illustrated in the figure is provided on the back side of the case 800g with a plurality of operation buttons 800a, a display unit 800b, an earpiece 800c and a mouthpiece 800d provided on the front side of the case 800g. A receiving unit 800e having a function of ringing and a transmission / reception antenna 800f provided on one side surface of the case 800g. Here, receiving section 800ca is provided in case 800g corresponding to the position of earpiece 800c. In the mobile phone 800 having the above configuration, the speaker device 100 is mounted in the case 800g, and is provided at positions corresponding to, for example, the receiving unit 800ca and the incoming unit 800e.

  Further, as shown in FIG. 11, the speaker device 100 or the like can be provided on the side surface side of the mobile phone 900.

  In addition, in this invention, the speaker apparatus of this invention can be applied suitably with respect to various portable apparatuses other than such a mobile telephone. Since the speaker device of the present invention is reduced in thickness and size, the use of such a speaker device in a portable device typified by such a mobile phone contributes to the reduction in thickness and size of the portable device. Can do.

The front view, back view, and side view of the speaker apparatus which concern on 1st Example of this invention. Sectional drawing cut | disconnected in the position which passes along the central axis of the speaker apparatus which concerns on 1st Example. Sectional drawing cut | disconnected in the position containing the spacer of the speaker apparatus which concerns on 1st Example. Sectional drawing cut | disconnected in the position containing the spacer of the speaker apparatus based on 2nd and 3rd Example. Sectional drawing cut | disconnected in the position containing the spacer of the speaker apparatus which concerns on the modification 1. FIG. The rear view of the speaker apparatus which concerns on the modification 2, and the perspective view of the reinforcement member which is the element. Sectional drawing cut | disconnected in the position containing the reinforcement member of the speaker apparatus of the modifications 2 and 3. FIG. The front view of the speaker apparatus which concerns on another modification, a rear view, and a side view. Sectional drawing cut | disconnected in the position which passes along the central axis of the speaker apparatus which concerns on another modification. The top view of the mobile telephone using the speaker apparatus of this invention. The top view of the other mobile telephone using the speaker apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b 1st plate 2a, 2b Magnet 3a, 3b 2nd plate 4 Frame 4a Spacer 4s Side surface 5 Diaphragm 6 Voice coil 7 Reinforcement member 7a Opening 30, 30x Magnetic circuit 31 Vibration system member 70a 1st magnetic gap 70b Second magnetic gap 100, 200, 300, 400, 500, 600, 700 Speaker device 800, 900 Mobile phone

Claims (9)

With frame and magnetic circuit,
The magnetic circuit is:
A pair of first plates facing each other with a fixed gap;
A pair of magnets arranged opposite to each other with a certain gap on the pair of first plates, the surfaces facing each other having different polarities;
A pair of second plates in contact with the frame and opposed to each other with a certain gap on the pair of magnets,
A first magnetic gap is formed in the gap between the pair of first plates, and a second magnetic gap is formed in the gap between the pair of second plates,
A spacer is interposed in at least one of the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates. Speaker device.   The speaker device according to claim 1, wherein the spacer defines a width of the first magnetic gap and / or the second magnetic gap.   The spacer includes at least one of the gap on both ends of the pair of first plates, the gap on both ends of the pair of magnets, and the gap on both ends of the pair of second plates. The speaker device according to claim 1, wherein the speaker device is interposed at a position corresponding to the gap. The spacer located in the first magnetic gap has the same size as the gap between the pair of first plates;
The spacer located in the gap between the pair of magnets has the same size as the gap;
4. The speaker according to claim 1, wherein the spacer located in the second magnetic gap has the same size as the gap between the pair of second plates. 5. apparatus.   The speaker device according to any one of claims 1 to 4, wherein the spacer is formed integrally or independently with the frame.   The speaker device according to claim 1, wherein the spacer is made of a nonmagnetic material. A first parallel portion extending in one direction, a second parallel portion extending in a direction parallel to the first parallel portion, and facing the first parallel portion with a constant interval; A voice coil having
A diaphragm having a slender shape and a concave voice coil installation part for installing the voice coil in the center part,
The frame has an elongated shape and supports an outer peripheral portion of the diaphragm;
The pair of first plates, the pair of magnets, and the pair of second plates each have a rectangular parallelepiped shape or a rectangular bar shape, and the first magnetic gap and the second magnetic gap are straight lines. Has a shape,
The voice coil installation portion is disposed at a position passing through the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates,
The first parallel portion is located in the first magnetic gap, and the second parallel portion is located in the second magnetic gap;
The outer walls of the pair of first plates, the pair of magnets, and the pair of second plates are attached to opposing inner surfaces of the frame via an adhesive. 3. The speaker device according to 3. With frame and magnetic circuit,
The magnetic circuit is:
A pair of first plates facing each other with a fixed gap;
A pair of magnets disposed opposite to each other with a certain gap on the pair of first plates, the surfaces facing each other having different polarities;
A pair of second plates in contact with the frame and opposed to each other with a certain gap on the pair of magnets,
A first magnetic gap is formed in the gap between the pair of first plates, and a second magnetic gap is formed in the gap between the pair of second plates,
A spacer is interposed in at least one of the gap between the pair of first plates, the gap between the pair of magnets, and the gap between the pair of second plates, and the frame includes:
A speaker device having side surfaces substantially parallel to the surfaces of the magnets facing each other, wherein the side surfaces have openings.   A portable device comprising the speaker device according to any one of claims 1 to 8.

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