JP3875843B2 - Sound playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound reproducing device including a speaker device that houses a speaker unit in a housing.
[0002]
[Prior art]
A speaker device included in a sound reproduction device such as a stereo or radio cassette is configured by housing a speaker unit that emits sound by an amplitude operation in a housing (cabinet), for example.
[0003]
[Problems to be solved by the invention]
By the way, in the speaker device, since unnecessary vibration generated when the vibration of the speaker unit is transmitted to a cabinet or the like affects the sound quality characteristics, various attempts have been made to suppress unnecessary vibration.
On the other hand, with the recent miniaturization and thinning of the sound reproducing device, if the cabinet of the speaker device is to be miniaturized and thinned, the inner surface of the cabinet becomes closer to the speaker unit that operates in amplitude. As a result, unnecessary vibration from the speaker unit is more easily transmitted to the cabinet, and the sound quality is likely to deteriorate.
[0004]
In conventional speaker devices and sound reproducing devices, it has not been possible to sufficiently achieve both improvement in sound quality characteristics by suppressing unnecessary vibration and reduction in size and thickness.
[0005]
An object of the present invention is to provide a sound reproducing device including a speaker device that can reduce unnecessary vibrations and improve sound quality characteristics, and can be reduced in size and thickness.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention described in claim 1 includes, for example, as shown in FIGS. 1 to 6, a speaker unit 21, and a housing (for example, cabinet P) that houses the speaker unit therein. In the sound reproducing device (for example, the thin radio cassette 100) including the speaker device 1 composed of the speaker device, the speaker device is disposed on the back surface of the speaker unit and on the inner surface of the housing in a state where the speaker unit is accommodated in the housing. A non-woven fabric L that is pressed against and reduces vibration transmitted to the housing is provided ,
The housing has a hollow portion B along the length direction, and a support shaft A that rotatably attaches the speaker device main body to the sound reproducing device main body .
The wiring from the speaker device is passed through the hollow portion of the support shaft.
[0007]
According to the first aspect of the present invention, in the rotary speaker device provided in the sound reproducing device, the nonwoven fabric interposed between the back surface of the speaker unit and the inner surface of the housing reduces vibration transmitted to the housing. At the same time, since the back surface of the speaker unit is pressed against the inner surface of the housing through the nonwoven fabric, the speaker unit and the housing are integrated to give high rigidity. As described above, a high vibration damping effect is given to the rotary speaker device provided in the sound reproducing device, and unnecessary sound transmitted from the speaker unit operating in amplitude to the housing can be greatly reduced to improve sound quality characteristics.
In addition, since the speaker unit can be disposed in pressure contact with the inner surface of the housing, it is possible to reduce the size and thickness of the rotary speaker device provided in the sound reproducing device .
[0008]
The invention according to claim 2 is the sound reproducing device according to claim 1, for example, as shown in FIG.
The inner surface of the housing is provided with a concave portion 33 in accordance with the shape of the nonwoven fabric at a portion where the nonwoven fabric is pressed.
[0009]
According to the second aspect of the present invention, the same effect as that of the first aspect can be obtained, and the non-woven fabric formed on the back surface of the speaker unit is more reliably pressed in a state of being accommodated in the recess. In addition, the nonwoven fabrics are accommodated in the recesses so that they overlap each other, further contributing to the thinning of the speaker device and accommodating a thicker nonwoven fabric.
In addition, since the vibration is transmitted to the housing when the speaker unit that operates in amplitude contacts the inner surface of the housing, it is preferable that the speaker unit does not contact the housing and only the nonwoven fabric is accommodated in the recess. .
[0010]
The invention according to claim 3 is the sound reproducing device according to claim 1 or 2, as shown in FIGS.
The casing is between the panel 20 with the panel 20 having the opening 24 into which the speaker unit is inserted, and the nonwoven fabric provided on the back surface of the speaker unit inserted into the opening in pressure contact with the inner surface. And a case 30 for housing the speaker unit,
The panel is characterized in that a nonwoven fabric N is provided on the surface facing the case.
[0011]
According to the third aspect of the present invention, the same effects as in the first or second aspect can be obtained, and the non-woven fabric provided on the surface of the panel facing the case is transmitted from the speaker unit that operates in amplitude to the casing. Acts to reduce Thereby, compared with the case where a nonwoven fabric is not provided, the arrangement | positioning which makes the inner surface of a housing | casing closer to a speaker unit is attained, and it contributes further to size reduction and thickness reduction of a speaker apparatus.
[0012]
For example, as shown in FIGS. 2 and 4, the invention according to claim 4 is the sound reproducing device according to claim 3.
The housing includes a grille 10 disposed in front of the panel and spaced from the panel;
The grill is characterized in that a non-woven fabric M is provided on the surface facing the panel.
[0013]
According to the fourth aspect of the present invention, the same effect as in the third aspect can be obtained, and the nonwoven fabric provided on the surface of the grill facing the panel reduces unnecessary vibration transmitted from the speaker unit that operates in amplitude to the housing. Acts like Thereby, compared with the case where a nonwoven fabric is not provided, the arrangement | positioning which makes a grille closer to a speaker unit is attained. Accordingly, the gap between the grille and the panel can be further reduced, which further contributes to the reduction in size and thickness of the speaker device.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, with reference to FIGS. 1-6, the thin radio cassette 100 (sound reproduction apparatus) of embodiment of this invention is demonstrated in detail.
As shown in FIG. 1, the thin radio cassette 100 includes a pair of left and right speaker devices 1. The speaker device 1 opens to the left and right about a support shaft A provided substantially perpendicularly to the side surface of the thin radio cassette 100 and rotates to a position that is substantially flush (the open state in FIG. 1A is a two-dot chain line). ). When the thin radio cassette 100 is not used, the speaker device 1 is folded to be compact and easy to handle (the folded state in FIG. 1A is shown by a solid line).
[0017]
As shown in FIG. 2, the speaker device 1 has a speaker unit 21 housed in a cabinet P (housing) serving as an outer frame. A circular nonwoven fabric L is stuck on the back surface of the speaker unit 21 (see FIGS. 3 and 5).
The cabinet P has a grill 10 constituting the front surface of the cabinet P, a substantially rectangular frame into which the grill 10 is fitted, and an opening 24 into which the speaker unit 21 is inserted in a state of protruding rearward from the front. The panel 20, the panel 20 and the peripheral edge portion are provided so that they can be fitted to each other. The case 30 that houses the speaker unit 21 between the panel 20 and the holder 40 that is attached to the side surface of the case 30 and constitutes the support shaft A. It consists of.
The grill 10 is fitted into the substantially rectangular frame portion of the panel 20 from the front, and the peripheral portions of the panel 20 and the case 30 are fitted to each other through the screw holes 10a, 20a, 30a from the rear of the case 30. And screwed together from the four corners.
[0018]
On the inner surface of the case 30, a concave portion 33 that is slightly recessed in a circular shape is formed together with the nonwoven fabric L (see FIG. 2). Here, as shown in the cross-sectional view of FIG. 3, the dimensions of the grill 10, the panel 20, and the case 30 in the front-rear direction are integrally screwed so that the nonwoven fabric L enters the recess 33 and the speaker The unit 21 is designed so that the back surface of the unit 21 and the case 30 are pressed against the inner surface of the case 30 with a gap δ.
With the above configuration, the speaker unit 21 and the cabinet P are firmly fixed in an integrated state to give the speaker device 1 high rigidity, and the nonwoven fabric L interposed between the speaker unit 21 and the inner surface of the case 30 is provided. Along with the action of reducing the vibration, the speaker device 1 is given a high damping effect.
Note that the back surface of the speaker unit 21 and the inner surface of the case 30 are not in direct contact, and the vibration of the speaker unit 21 is not directly transmitted to the cabinet P.
[0019]
The panel 20 is made of ABS resin. As shown in FIG. 2, the speaker unit 21 is inserted into the opening 24 of the panel 20 from the front and is screwed through the hole 21a and the hole 24a in a state of protruding rearward. . A step corresponding to the shape of the speaker unit 21 is provided around the opening 24. The tweeter 22 held by the holder 23 is inserted into the opening 25 from behind and protrudes forward. The holder 23 is integrally provided with two plate-like protrusions 23a protruding from the side surface. As shown in FIG. 5, the two protrusions 23a are fitted so as to straddle the two support portions 26 provided upright around the opening portion 25 on the back surface of the panel 20, and screwed through the screw holes 26a. Is done. Note that the tweeter 22 is a high-frequency dedicated speaker.
The panel 20 has a distribution circuit (not shown) for supplying electric signals corresponding to the respective bands to the speaker unit 21 and the tweeter 22, and a bar antenna fixed to the back surface of the panel 20 while being held by the substrate 27a. 27, a rectangular duct 28 formed at the lower corner, and the like.
[0020]
As shown in FIG. 2, the grill 10 is made of polystyrene resin, and has a substantially circular opening 11, 12 formed at a position corresponding to the speaker unit 21 and the tweeter 22 and a position corresponding to the duct 28 of the panel 20. A rectangular duct 13 to be formed and a well-known saran net (not shown) stretched on the front surface of the grill 10 are provided. The openings 11 and 12 are provided with a plurality of rod-like members 11a and 12a in the form of upper, lower, left and right meshes, which contributes to improvement in rigidity. The duct 13 together with the duct 28 serves as an air outlet for the cabinet P, and promotes good amplitude operation of the speaker unit 21 and the tweeter 22.
[0021]
The case 30 is made of polystyrene and blended and designed to have sufficient rigidity by including known additives. A cushion 35 is provided on the lower surface of the plate-like portion 34 that stands vertically from the inner surface of the case 30.
[0022]
FIG. 4 shows the back of the grill 10. On the rear surface of the grill 10, a non-woven fabric M having a shaded shape is attached in close contact with the screw holes 10a at the four corners. FIG. 5 shows the back side of the panel 20. A non-woven fabric N having a shaded shape is attached to the back surface of the panel 20 through the screw holes 20a at the four corners. The panel 20 is appropriately formed with a protruding piece 20b protruding from the back surface. The non-woven fabric N is supported by a large number of protruding pieces 20b, and is attached in close contact with the back surface of the panel 20 while being pressed from the back surface by the plate-like portion 34 (see FIG. 2). Moreover, the nonwoven fabric N is mutually adhere | attached in the part which contacts the cushion 35 (refer FIG. 2).
A configuration in which the inner surface of the cabinet P is closer to the speaker unit 21 and the tweeter 22 that perform an amplitude operation by the vibration damping action of the nonwoven fabrics M and N becomes possible. Thereby, volume reduction of the space X (refer FIG. 3) which consists of the grill 10 back surface and the panel 20 front surface, and the space Y (refer FIG. 3) which consists of the panel 20 back surface and the case 30 inner surface is achieved, and the speaker apparatus 1 is achieved. Contributes to downsizing and thinning
[0023]
As shown in FIG. 2, a concave portion 31 is formed on one side surface of the case 30. Two notches 31 a are provided at the peripheral edge of the case 30 facing the panel 20. A rotating shaft 32 is integrally provided so as to protrude rearward from the U-shaped portion of the recess 31. The rotary shaft portion 32 is fitted with the holder 40 from the side and is screwed through the receiving hole 32b and the hole 41b.
The holder 40 is integrally formed with a rotary shaft 41 having an inner surface with a semicircular cross section extending vertically. Projections 32a and 41a having an inner surface with a semicircular cross section are formed on the rotary shaft portion 32 and the rotary shaft portion 41, respectively. The holder 40 is screwed, and the bearing 42 is fitted to a cylindrical portion formed by the protrusion 32a and the protrusion 41a, and the support shaft A including the hollow portion B extending in the vertical direction is configured. A notch 42 a provided in the bearing 42 is fixed to the thin radio cassette 100.
As described above, the speaker device 1 is rotatably supported on the side surface of the thin radio cassette 100.
[0024]
Further, the interior of the case 30 communicates with the space formed by the rotating shaft portion 32 and the holder 40 by the two notches 31a. As a result, the wiring in the case 30 can be drawn out of the speaker device 1 via the cylindrical space formed by the protrusion 31a and the protrusion 41a via the communicating space. By wiring the wiring so as to pass through the inside of the support shaft A in this way, even when the speaker device 1 is rotated on the side surface of the thin radio cassette 100, an excessive force does not act on the wiring, and disconnection or the like. Trouble is prevented.
[0025]
FIG. 6 shows the back of the case 30. On the back surface of the case 30, a recess 36 that extends in the horizontal direction with a vertical width L is provided continuously in the vertical direction. As shown in FIG. 6B, the cross section (longitudinal direction) of the recess 36 is formed in a substantially waveform that is slightly curved in an arc shape. The recess 36 further enhances the rigidity of the case 30. FIG. 6B is a cross-sectional view taken along the line AA ′ shown in FIG.
Further, an escutcheon 37 made of an elastic material is provided so that the upper part thereof slightly protrudes from the back surface of the case 30 and prevents the back surface of the thin radio cassette 100 from strongly hitting when the speaker device 1 is folded.
[0026]
When the above thin radio cassette 1 is used, unnecessary vibration transmitted by the amplitude operation of the speaker unit 21 and the tweeter 22 due to the sufficient rigidity of the cabinet P and the vibration control action obtained from the nonwoven fabrics L, M, and N The sound quality characteristics can be improved.
[0027]
According to the thin radio cassette 100 of the present embodiment described above, the amplitude is obtained by the high rigidity obtained when the nonwoven fabric L on the back surface of the speaker unit 21 is pressed against the inner surface of the case 30 and the damping action of the nonwoven fabrics L, M and N. Unnecessary vibration transmitted to the cabinet P from the operating speaker unit 21 and tweeter 22 and the like can be greatly reduced, which contributes to improvement in sound quality characteristics.
Further, the volume of the cabinet P is reduced by the vibration damping action of the nonwoven fabrics M and N, which contributes to the reduction in thickness and size of the speaker device 1.
[0028]
The present invention is not limited to the above embodiment. That is, it goes without saying that changes can be made as appropriate without departing from the spirit of the present invention.
For example, in addition to the materials and thicknesses of the nonwoven fabrics L, M, and N, the size of the nonwoven fabrics L, M, and N can be arbitrarily designed.
In the present embodiment, the nonwoven fabrics M and N provided on the back surface of the grill 10 and the back surface of the panel 20 are not bonded, but may be bonded using a known adhesive or the like. In this case, the nonwoven fabrics M and N are more securely adhered and fixed. Furthermore, when wiring is integrated inside the cabinet P, an adhesive sheet made of a non-woven fabric having an adhesive layer coated with a known adhesive on the back surface may be used. In this case, the nonwoven fabric provided inside the cabinet P is further increased, and the damping effect for reducing unnecessary vibration is further enhanced.
[0029]
【The invention's effect】
According to the first aspect of the present invention, a high vibration damping effect is obtained from the high rigidity obtained by integrating the speaker unit and the housing, and the nonwoven fabric interposed between the back surface of the speaker unit and the inner surface of the housing. Is obtained. Accordingly, it is possible to significantly reduce unnecessary vibrations transmitted from the speaker unit that operates in amplitude to the housing, thereby improving sound quality characteristics. In addition, since the speaker unit can be disposed in pressure contact with the inner surface of the housing, the size and thickness can be reduced.
[0030]
According to invention of Claim 2, while having the same effect as Claim 1, it is more reliably press-contacted in the state in which the nonwoven fabric was accommodated in the recessed part. In addition, the non-woven fabric and the inner surface of the housing are overlapped with each other to further contribute to the reduction in thickness.
[0031]
According to the third aspect of the present invention, the same effect as in the first or second aspect can be achieved, and the inner surface of the housing can be arranged closer to the speaker unit, further reducing the size and thickness of the speaker device. Contribute.
[0032]
According to the fourth aspect of the invention, the same effect as in the third aspect can be obtained, and the grille can be disposed closer to the speaker unit, which further contributes to the reduction in size and thickness of the speaker device.
[0033]
According to the fifth aspect of the present invention, the same effect as any one of the first to fourth aspects can be obtained, the unnecessary vibration can be reduced, the sound quality characteristics can be improved, and the size and thickness can be reduced. Thus, a sound reproducing device including a rotary speaker device that can perform the above operation is obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a thin radio cassette 100 according to an embodiment to which the present invention is applied.
2 is an exploded perspective view showing the speaker device 1 of FIG. 1. FIG.
3 is a cross-sectional view showing the speaker device 1 of FIG. 1. FIG.
4 is a view showing a rear surface of the grill 10 of FIG. 2. FIG.
FIG. 5 is a view showing a back surface of the panel 20 of FIG. 2;
6 is a view showing a back surface of the case 30 of FIG. 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Speaker apparatus 10 Grill 20 Panel 21 Speaker unit 24 Opening part 30 Case 33 Concave part 100 Thin radio cassette (sound reproduction apparatus)
A Support shaft B Hollow part L Nonwoven fabric M Nonwoven fabric N Nonwoven fabric P Cabinet (housing)

Claims (4)

In a sound reproducing device including a speaker device including a speaker unit and a housing that accommodates the speaker unit therein ,
The speaker device is provided on the back surface of the speaker unit with a non-woven fabric that presses against the inner surface of the housing in a state where the speaker unit is housed in the housing, and reduces vibrations transmitted to the housing .
The housing has a hollow portion along the length direction, and a support shaft that rotatably attaches the speaker device body to the sound reproduction device body,
A sound reproducing device, wherein a wiring from the speaker device is passed through a hollow portion of the support shaft. The sound reproducing device according to claim 1,
The sound reproducing apparatus according to claim 1, wherein the inner surface of the housing is provided with a concave portion that matches the shape of the nonwoven fabric at a portion where the nonwoven fabric is pressed. The sound reproducing device according to claim 1 or 2,
The housing includes a panel having an opening into which the speaker unit is inserted, and the non-woven fabric provided on the back surface of the speaker unit inserted into the opening with the panel in contact with the inner surface. A case for housing the speaker unit,
Wherein the panels, sound reproducing apparatus characterized by the nonwoven fabric is provided on a surface facing the case. The sound reproducing device according to claim 3, wherein
The housing includes a grill disposed in front of the panel and spaced from the panel;
The sound reproducing apparatus according to claim 1, wherein the grill is provided with a non-woven fabric on a surface facing the panel.

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