JP4404721B2 - Speaker unit - Google Patents

Description

  The present invention relates to a speaker unit used by being incorporated in an electronic device such as a mobile phone.

Conventionally, this type of speaker unit (8) includes a base frame (81) and a cover plate (85), as shown in FIG. 7, and the base frame (81) and the cover plate (85) are arranged on the outer periphery of each. Are joined together to form a flat casing (80). Inside the casing (80), a magnetism generator (40) and a diaphragm (5) are arranged.
The outer periphery of the diaphragm (5) is sandwiched between the base frame (81) and the cover plate (85), and a coil (41) is attached to the rear surface of the diaphragm (5). In addition, a magnetism generating section (40) is disposed on the bottom surface (82) of the base frame (81) so as to face the diaphragm (5).
The magnetism generator (40) includes a yoke (44) having a U-shaped cross section, a magnet (42) disposed on the yoke (44), and a pole piece (43) disposed on the magnet (42). The coil (41) is disposed in the gap between the pole piece (43) and the yoke (44) (see Patent Document 1).

In the speaker unit (8), an annular packing (3) is further installed on the cover plate (85), and a water repellent sheet (32) is installed on the packing (3) (Patent Document 2). reference).
JP 2002-152896 A [H04R 31/00] JP 2002-271465 A [H04M 1/03]

  By the way, in electronic devices such as cellular phones in which this type of speaker unit is built in, the demand for downsizing and thinning is becoming more and more severe, and in order to meet this demand, downsizing and thinning of the speaker unit are required. Is being considered.

  FIG. 8 shows a structure in which a conventional speaker unit (8) is mounted on a mating member (7) such as a cabinet. The speaker unit (8) is mounted on a mounting surface (72) of the mating member (7). It is attached using a fastener (70) consisting of (73) and a screw (71). As a result, the packing (3) is pressed and compressed, and comes into close contact with the mounting surface (72).

  According to the above structure, the distance G between the cover plate (85) of the speaker unit (8) and the mounting surface (72) of the mating member (7) is determined by the compression amount of the packing (3). Since the compression amount of the packing (3) varies depending on the fastening force of the fastener (70), the distance G between the cover plate (85) and the mounting surface (72) of the mating member (7) also varies. The sound quality and sound pressure of the speaker unit (8) are not stable.

  Furthermore, since the packing (3) is interposed between the cover plate (85) of the speaker unit (8) and the mounting surface (72) of the mating member (7) in the mounted state of the speaker unit (8), The speaker unit (8) is separated from the mounting surface (72) of the mating member (7) by the thickness of the packing (3) compressed by the fastening by the fastener (70). Therefore, there is a limit to the reduction in thickness of the speaker unit (8) in the mounted state.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker unit that has stable sound quality and sound pressure when attached to a mating member and can be thinned when attached.

  The speaker unit according to the present invention is attached to the attachment surface (72) of the counterpart member (7) by pressure contact, and the base frame (1) and the cover plate (2) are joined to each other to form a flat casing ( 10) is configured. Inside the casing (10), a diaphragm (5) and a drive device for vibrating the diaphragm (5) are arranged, and the outer periphery of the casing (10) is interposed via an annular packing (3). And press-contacted to the mounting surface (72). An annular flange (15) projecting outward from the outer peripheral portion of the cover plate (2) is formed on the outer peripheral portion of the base frame (1), and the mounting surface ( 72) is provided with a packing installation surface (16), and the packing (3) is installed on the packing installation surface (16). Furthermore, the cover plate (2) is formed with a pressure contact portion to be pressed against the mounting surface (72) on the surface facing the mounting surface (72), and the packing installation surface (16) is formed with the pressure contact portion. The packing (3) is provided in a position retracted in a direction away from the mounting surface (72), and the pressure contact part of the cover plate (2) is in pressure contact with the mounting surface (72). It is compressed by being clamped by the installation surface (16) and the mounting surface (72).

According to the speaker unit of the present invention, the mounting position with respect to the mating member (7) is accurately determined by the press-contact portion of the cover plate (2) being pressed against the mounting surface (72) of the mating member (7). The position of the speaker unit with respect to the counterpart member (7) does not change depending on the mounting state, and as a result, variations in sound quality and sound pressure of the speaker unit can be prevented.
Further, since the packing (3) is not interposed between the pressure contact part and the mounting surface (72), the thickness of the speaker unit in the mounted state is equal to the thickness of the compressed packing (3) than the conventional speaker unit. Therefore, the speaker unit can be thinned in the mounted state.
Further, since the compression amount of the packing (3) is regulated to a predetermined value by the pressure contact portion coming into contact with the mounting surface (72), the sealing performance of the packing (3) does not vary, thereby Sound leakage from (3) can be reliably prevented.

  In a specific configuration, the packing installation surface (16) is provided at a position retracted in a direction away from the attachment surface (72) by a predetermined distance h from the pressure contact portion, and the packing (3) is provided on the attachment surface. The thickness T is larger than the predetermined distance h in the free state before being pressed against (72).

  According to the specific configuration, the compression amount of the packing (3) in the attached state is a value (Th) obtained by subtracting the predetermined distance h from the thickness T of the packing (3) in the free state before the attachment. Accurately defined.

  In a specific configuration, the driving device includes a coil (41) attached to the diaphragm (5) and a bottom surface (12) of the base frame (1) facing the coil (41). It is composed of an installed magnetic generator (40).

  Furthermore, in a specific configuration, the cover plate (2) includes a flat central flat portion (23) and the central flat portion protruding from the central flat portion (23) toward the mounting surface (72). An annular outer peripheral flat portion (22) surrounding (23), an annular inclined wall portion (24) connecting the central flat portion (23) and the outer peripheral flat portion (22) to each other, and an outer peripheral flat portion (22). An annular leg portion (25) projecting from the outer peripheral edge, and the pressure contact portion is formed by the outer peripheral flat portion (22), and the leg portion (25) is a bottom surface (14) of the base frame (1). And the outer peripheral portion of the diaphragm (5) is sandwiched between the leg portion (25) and the bottom surface (14) of the base frame (1).

  According to the specific configuration, since the cover plate (2) has a bent cross-sectional shape, the rigidity of the cover plate (2) is high. Therefore, there is no possibility that the cover plate (2) is deformed by the force that the pressure contact portion receives from the mounting surface.

  Furthermore, in a specific configuration, a water repellent sheet (32) covering the surface of the cover plate (2) is installed on the surface of the packing (3), and the attachment is performed via the water repellent sheet (32). Attached to surface (72).

  According to the specific configuration, even if water enters the speaker unit from the counterpart member (7) side, the water is repelled by the water repellent sheet (32) and enters the speaker unit. Can be prevented.

  According to the speaker unit of the present invention, the sound quality and the sound pressure are stable, and the thickness can be reduced in the mounted state.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, the speaker unit (6) according to the present invention includes a base frame (1) and a cover plate (2), and the base frame (1) and the cover plate (2) are arranged at the outer peripheral portions thereof. Joined together, a flat casing (10) is formed.
As shown in FIG. 2, a magnetism generating part (40) and a diaphragm (5) are arranged inside the casing (10), and a coil (41) is fixed to the back surface of the diaphragm (5).
The outer periphery of the diaphragm (5) is sandwiched between the base frame (1) and the cover plate (2), and the bottom surface of the base frame (1) faces the diaphragm (5). A magnetic generator (40) is provided.
Further, an annular packing (3) is installed on the flange (15) on the outer periphery of the base frame (1), and a water repellent sheet (32) is installed on the packing (3).

As shown in FIG. 4, the base plate (1) has a dish shape, and the first bottom surface (12), the second bottom surface (13), and the third bottom surface (14) are concentric steps on the inner surface of the base plate (1). Is formed. The magnetic generating part (40) is installed on the first bottom surface (12), and a plurality of circular holes (11) are formed on the second bottom surface (13). The outer peripheral portion of the diaphragm (5) is sandwiched between the third bottom surface (14) and the cover plate (2).
Furthermore, an annular flange (15) projecting outward from the outer peripheral portion of the cover plate (2) is formed on the outer peripheral portion of the base plate (1), and a flat packing is installed on the upper surface of the flange (15). A surface (16) is formed.

As shown in FIG. 6, the cover plate (2) is formed in a disc shape having a bent cross-sectional shape, and a central flat portion (23) is formed at the central portion, and the outer periphery of the central flat portion (23) is formed. An annular outer peripheral flat portion (22) that surrounds and an annular inclined wall portion (24) that connects the central flat portion (23) and the outer peripheral flat portion (22) to each other are formed.
A plurality of circular sound emission holes (21) are formed in the central flat part (23), and the outer peripheral flat part (22) protrudes upward from the central flat part (23). Further, an annular leg portion (25) projects from the outer peripheral portion of the outer peripheral flat portion (22), and the leg portion (25) vibrates on the third bottom surface (14) of the base frame (1). It is fixed with a plate (5) in between.

As shown in FIG. 5, the packing (3) has an annular shape having a rectangular cross-sectional shape and is formed of an elastic seal material. As shown in FIG. 2, a water repellent sheet (32) for preventing water from entering the speaker unit (6) is bonded to the upper surface of the packing (3) via an adhesive layer (31). The lower surface of the packing (3) is joined to the packing installation surface (16) of the flange (15) provided on the base frame (1) via an adhesive layer (31). In this embodiment, the packing (3) is formed using Polon (trade name: manufactured by Roger Sinoac), and double-sided adhesive tape is used as the adhesive layers (31) (31).
Further, the thickness T of the packing (3) including both adhesive layers (31) and (31) in a free state before mounting is determined by the packing installation surface (16) of the base frame (1) and the cover plate (see FIG. 2). It is set larger than the distance h between the outer peripheral flat part (22) of 2).

The magnetism generator (40) includes a yoke (44) having a U-shaped cross section, a magnet (42) disposed on the yoke (44), and a pole piece (43) disposed on the magnet (42). The coil (41) fixed to the back surface of the diaphragm (5) is disposed in the gap between the pole piece (43) and the yoke (44).
The diaphragm (5) has a circular shape and is formed of a thin film-like resin. As described above, the diaphragm (5) is formed between the third bottom surface (14) of the base frame (1) and the legs (25) of the cover plate (2). Sandwiched between.

  In the magnetic generator (40), the magnetic lines of force generated from the magnet (42) extend in a loop along the magnetic path formed by the pole piece (43) and the yoke (44), and cross the coil (41). As a result, a driving force acts on the coil (41), and the diaphragm (5) is driven.

  FIG. 2 shows a state before the speaker unit (6) of the present invention is attached. The packing installation surface (16) of the base frame (1) is a predetermined distance from the outer peripheral flat part (22) of the cover plate (2). It is located below by h. Since the thickness T of the packing (3) including the adhesive layers (31) and (31) is set larger than the predetermined distance h as described above, the water repellent sheet (32) fixed to the upper surface of the packing (3). ) Is arranged above the outer peripheral flat portion (22) of the cover plate (2).

  FIG. 3 shows the mounting state of the speaker unit (6) of the present invention. The speaker unit (6) comprises a speaker holder (73) and a screw (71) on the mounting surface (72) of the mating member (7). It is attached using a fastener (70). As a result, the packing (3) is pressed and compressed, and comes into close contact with the mounting surface (72). When the packing (3) is further compressed by fastening with the fastener (70), the outer peripheral flat part (22) of the cover plate (2) is pressed against the mounting surface (72) of the mating member (7), and the speaker unit (6) is accurately positioned relative to the mounting surface (72).

  In this manner, the mounting position of the speaker unit (6) is accurately determined by pressing the outer peripheral flat portion (22) of the cover plate (2) against the mounting surface (72) of the mating member (7). The position of 6) with respect to the mating member (7) does not change depending on the mounting state.

  In the speaker unit (6) of the present invention, since the packing (3) is not interposed between the outer peripheral flat portion (22) and the mounting surface (72) of the cover plate (2), the speaker unit (6) in the mounted state. Can be made smaller than the conventional speaker unit (8) by the thickness G of the packing (3) after compression (see FIG. 8), so that the speaker unit (6) in the mounted state can be reduced. Thinning can be achieved.

  In this state, the thickness of the packing (3) is regulated to the above-mentioned predetermined distance h, and the compression amount of the packing is set to the predetermined distance h from the thickness T of the packing (3) etc. in the above-mentioned free state. Since it is precisely defined by the subtracted value (T−h), the sealing performance of the packing (3) does not vary, and thus sound leakage from the packing (3) can be surely prevented.

  Further, according to the speaker unit (6) of the present invention, the mounting position on the mating member (7) is such that the outer peripheral flat portion (22) of the cover plate (2) is on the mounting surface (72) of the mating member (7). The position of the speaker unit (6) with respect to the mating member (7) does not change depending on the mounting state because it is accurately determined by pressure contact, and as a result, variations in sound quality and sound pressure of the speaker unit (6) are prevented. I can do it.

In addition, each part structure of this invention is not restricted to said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, in the present invention, the water repellent sheet (32) is provided on the upper surface of the packing (3), but it can be omitted if waterproofing is not necessary.
The material of the packing (3) is not limited to the above, and various materials having sealing properties and elasticity such as rubber and elastomer can be employed.

It is a perspective view which shows the external appearance of the speaker unit which concerns on this invention. It is sectional drawing of this speaker unit. It is sectional drawing which shows the attachment state of this speaker unit. It is a partially broken perspective view of a base frame. It is a partially broken perspective view of packing. It is a partially broken perspective view of a cover plate. It is sectional drawing of the conventional speaker unit. It is sectional drawing which shows the attachment state of the conventional speaker unit.

Explanation of symbols

(1) Base frame
(10) Casing
(15) Flange
(16) Packing installation surface
(2) Cover plate
(22) Flat outer periphery
(3) Packing
(40) Magnetic generator
(41) Coil
(42) Magnet
(44) York
(5) Diaphragm
(6) Speaker unit
(7) Mating member
(70) Fastener
(72) Mounting surface

Claims (5)

A speaker unit to be mounted in pressure contact with a mounting surface (72) of a mating member (7), wherein a base frame (1) and a cover plate (2) are joined together to form a flat casing (10). In the casing (10), a diaphragm (5) and a driving device for vibrating the diaphragm (5) are arranged, and an outer periphery of the casing (10) is provided with an annular packing (3). In the speaker unit pressed against the mounting surface (72) through,
An annular flange (15) projecting outward from the outer peripheral portion of the cover plate (2) is formed on the outer peripheral portion of the base frame (1).
The flange (15) has a packing installation surface (16) formed on a surface facing the mounting surface (72), and the packing (3) is installed on the packing installation surface (16).
The cover plate (2) has a sound emitting portion provided with a sound emitting hole (21) on a surface facing the mounting surface (72), and protrudes from the sound emitting portion to the mounting surface (72). a contact portion to be pressed is formed,
The packing installation surface (16), than the press contact portion provided at a position retracted in a direction away from said mounting surface (72),
In a state where the pressure contact portion of the cover plate (2) is in pressure contact with the mounting surface (72), the packing (3) is compressed by being sandwiched between the packing installation surface (16) and the mounting surface (72). A speaker unit characterized by that.   The packing installation surface (16) is provided at a position retracted in a direction away from the mounting surface (72) by a predetermined distance h from the pressure contact portion, and the packing (3) is pressed against the mounting surface (72). 2. The speaker unit according to claim 1, wherein the speaker unit has a thickness T larger than the predetermined distance h in a free state before the first time.   The driving device includes a coil (41) attached to the diaphragm (5), and a magnetic generator (40) installed on the bottom surface (12) of the base frame (1) so as to face the coil (41). The speaker unit according to claim 1 or 2, comprising: The cover plate (2) has a flat central flat portion (23) and an annular shape that projects from the central flat portion (23) toward the mounting surface (72) and surrounds the central flat portion (23). An outer peripheral flat portion (22), an annular inclined wall portion (24) connecting the central flat portion (23) and the outer peripheral flat portion (22) to each other, and an annular shape protruding from the outer peripheral edge of the outer peripheral flat portion (22) With legs (25)
The sound emitting part is formed by the central flat part (23),
The press contact portion is formed by the outer peripheral flat portion (22),
The leg portion (25) is fixed to the bottom surface (14) of the base frame (1), and the diaphragm (5) is interposed between the leg portion (25) and the bottom surface (14) of the base frame (1). The speaker unit according to any one of claims 1 to 3, wherein an outer peripheral portion of the speaker unit is sandwiched.   A water repellent sheet (32) covering the surface of the cover plate (2) is installed on the surface of the packing (3), and is attached to the attachment surface (72) via the water repellent sheet (32). The speaker unit according to any one of claims 1 to 4.

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