JP2004336509A - Speaker cabinet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker cabinet whose duct length is made shorter when the capacity of the cabinet is made larger with a simple mechanism, to easily adjust the strength at a certain point. <P>SOLUTION: In the speaker cabinet, where a front side cabinet 2 which has a body part 2b having a uniform cross section shape extended backward from a baffle 2a on the front surface and has a rear part opened and a rear side cabinet 3 which has a body part 3b having a uniform cross section shape extended forward from a rear face plate 3a and has a front part opened are assembled so that respective body parts are put one over the other, spacers 3c are interposed between respective body parts to form a duct 4 by the gap between body parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker cabinet, and more particularly to a speaker cabinet in which a duct is formed at a portion where a trunk of a front cabinet and a rear cabinet overlap.
[0002]
[Prior art]
FIG. 5 shows an example of a conventional bass reflex type speaker cabinet. A speaker 5 is attached to a baffle 10a located on the front surface of a speaker cabinet 10 shown in the figure, and a duct 11 is fixed to the baffle 10a. In this speaker cabinet, the length of the duct 11 and the internal volume of the speaker cabinet 10 are constant and not variable.
[0003]
FIG. 6 shows an example of a speaker system proposed in JP-A-2001-268676. The illustrated speaker cabinet 12 is configured by assembling a main box 13 and a sub box 14. A baffle 15 is formed at one end of the main box 13, and speakers 5 are attached to the baffle 15.
[0004]
16 is an acoustic board arranged in the main box 13, 17 is a main acoustic duct for emitting the sound in the main box 13 forward, and 18 is an acoustic grill for emitting the sound from the main box 13 toward the listening space. The auxiliary box 14 has a cylindrical box body, one end of which is opened, and the one end that is opened with its axis aligned with the main box 13 is assembled with the one end of the main box 13 in a state of being overlapped with each other. I have.
[0005]
The auxiliary acoustic duct 19 is attached to the baffle 15 and the acoustic board 16 so as to be aligned with the axis of the main box 13, protrudes from the auxiliary box 14 into the main box 13, and emits sound from the auxiliary box 14 to the main box 13. It penetrates between each box to make it.
[0006]
The sub box 14 is rotatable around the axis with respect to the main box 13 and is movable in the axial direction. A screw rod 20 is attached to the other end in such a manner that it is aligned with the axis and projects toward the auxiliary acoustic duct 19. Further, a screw receiver 22 screwed to the screw rod 20 via a screw receiver cover 21 is attached to the main box 13.
[0007]
A volume adjustment scale 23 is written on the main box 13, and the scale at which the edge of the sub box 14 is opposed to that of the sub box 14 indicates the position adjusted (moved in volume) in the axial direction. A friction member 24 is attached to the sub box 14 at a portion where the main box 13 overlaps the main box 13, and the movement adjustment position is held by the friction force of the friction member 24 and the screw friction of the screw rod 20.
[0008]
A duct volume variable member 25 formed by extending the screw rod 20 is inserted into the auxiliary acoustic duct 19, and varies the effective volume of the auxiliary acoustic duct 19 with the axial movement of the screw rod 20. The screw receiving cover 21 has a sound release hole 26. In the above configuration, the sound radiated from the front part of the speaker 5 resonates in the main box 13 as shown by a white arrow in the figure, and is radiated from the acoustic grill 18 to the listening space via the main acoustic duct 17. You.
[0009]
The sound radiated from the back of the speaker 5 resonates in the sub box 14 as shown by the solid arrow, and is radiated to the front of the main box 13 via the sub acoustic duct 19.
[0010]
Then, the sound is synthesized with the sound indicated by the white arrow passing through the main sound duct 17, and the synthesized sound is radiated from the sound grill 18 to the listening space. As described above, the acoustic characteristics of the speaker system can be adjusted by changing the volume in the sub box 14 and the effective volume of the sub acoustic duct 19.
[0011]
[Patent Document 1]
JP 2001-268676 A (page 2-3, FIGS. 1-2)
[0012]
[Problems to be solved by the invention]
The conventional speaker cabinet shown in FIG. 5 cannot change the acoustic characteristics so as to obtain the desired acoustic characteristics. In addition, since the size of the box cannot be changed, it is not easy to use when space is required.
[0013]
The conventional speaker cabinet shown in FIG. 6 has a problem in that the duct is composed of separate parts from the main box and the sub-box, and the mechanism for changing the volume of the sub-box is complicated and costly. . Further, when the volume of the sub box is increased, the duct length is also increased, so that it is not possible to adjust the strength at a certain point (frequency).
[0014]
The present invention has been made in view of the above points, and an object thereof is to reduce the duct length when increasing the volume of a cabinet by a simple mechanism, thereby facilitating the strength at a certain point. It is an object of the present invention to provide a speaker cabinet that can be adjusted to a desired position.
[0015]
[Means for Solving the Problems]
The speaker cabinet according to the present invention includes a front cabinet in which a body portion having the same cross-sectional shape extends rearward from a front baffle and a rear cabinet is opened, and a rear cabinet in which a body portion having the same cross-sectional shape extends forward from a rear plate and the front is released. In a speaker cabinet assembled such that the respective trunks are overlapped, a duct is formed by a gap between the trunks with a spacer interposed between the respective trunks.
[0016]
In the speaker cabinet, the spacer is formed by a convex shape provided on an outer surface of a body portion arranged inside or a convex shape provided on an inner surface of a body portion arranged outside.
[0017]
In the speaker cabinet, a tenon is formed in a convex shape formed on one trunk of the front cabinet or the rear cabinet, and the tenon is formed on the other trunk of the front cabinet or the rear cabinet. It fits in the groove.
[0018]
In each of the speaker cabinets, the trunk of the rear cabinet is disposed inside the trunk of the front cabinet, and the port of the duct is located at the rear of the cabinet.
[0019]
Further, in each of the speaker cabinets, by making the overlapping length of the two body portions variable, it is possible to simultaneously change the internal volume of the cabinet and the duct length.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
A speaker cabinet according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a front view illustrating a speaker cabinet according to an embodiment of the present invention, FIG. 1B is a rear view illustrating the speaker cabinet, and FIG. 1C is a cross-sectional view taken along line CC in FIG. 2A is a front view showing a front cabinet constituting the speaker cabinet, FIG. 2B is a rear view showing the front cabinet, and FIG. 2C is CC in FIG. 2A. 3 (a) is a front view showing a rear cabinet constituting the speaker cabinet, FIG. 3 (b) is a rear view showing the rear cabinet, and FIG. 3 (c) is a view in FIG. 3 (a). It is CC sectional drawing.
[0021]
As shown in FIG. 1, a front cabinet 2 and a rear cabinet 3 are assembled to form a speaker cabinet 1. The structure of the front cabinet 2 is shown in detail in FIG. As shown in FIG. 2, the front cabinet 2 has a structure in which a square tubular body 2b having a rear end opened is fixed to the rear of a baffle 2a.
[0022]
Grooves 2c, 2c,... Extending in the longitudinal direction are formed on the inner surface of the body 2b. Are provided with screw insertion holes 2d, 2d,... Penetrating through the grooves 2c, 2c. Further, the baffle 2a is provided with screw holes 2e, 2e,..., And the speaker 5 shown in FIG.
[0023]
As shown in FIG. 3, the rear cabinet 3 has a structure in which a rectangular tubular body 3b extends forward from a rear plate 3a. The front of the trunk 3b is open. A tenon 3c, 3c,... Extending in the longitudinal direction is formed on the outer surface of the body 3b. Nuts 7, 7,... Are embedded in the tenons 3c, 3c. A handle 3d is provided on the rear plate 3a.
[0024]
As shown in FIG. 1, the mortises 3c, 3c are fitted in the grooves 2c, 2c, and the screws 6, 6, which are inserted through the screw insertion holes 2d, 2d, are screwed into the nuts 7, 7,. Are fastened to the front cabinet 2. Then, a duct 4 is formed by a gap between the rear cabinet 3 and the front cabinet 2.
[0025]
By loosening the screws 6, 6,... And adjusting the position of the rear cabinet 3 with the handle 3d and tightening the screws 6, 6,..., The volume and duct length of the speaker cabinet 1 can be adjusted.
[0026]
In the speaker cabinet of the present invention, when the volume of the speaker cabinet is increased, the duct length is reduced. When the volume of the speaker cabinet is increased and the duct length is shortened, the frequency / sound pressure characteristic changes as shown by the dotted line in the direction of the arrow as shown in FIG.
[0027]
Although the embodiment is configured as described above, the invention is not limited to this.For example, although not shown in the drawing, the port of the duct may be set to the front side so that the rear cabinet overlaps the outside of the front cabinet. .
[0028]
【The invention's effect】
According to the speaker cabinet of the present invention, the volume occupied by the speaker cabinet can be reduced when space saving is required depending on the installation location. If there is room in the installation location, the volume of the cabinet can be increased to emphasize bass and obtain desired sound quality.
[0029]
Further, since the duct is formed by the members constituting the speaker cabinet, the structure is simple and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1A is a front view showing a speaker cabinet according to an embodiment of the present invention, FIG. 1B is a rear view showing the speaker cabinet, and FIG. It is CC sectional drawing.
2 (a) is a front view showing a front cabinet constituting the speaker cabinet, FIG. 2 (b) is a rear view showing the front cabinet, and FIG. 2 (c) is C in FIG. 2 (a). It is -C sectional drawing.
3 (a) is a front view showing a rear cabinet constituting the speaker cabinet, FIG. 3 (b) is a rear view showing the rear cabinet, and FIG. 3 (c) is FIG. 3 (a) 5 is a sectional view taken along line CC in FIG.
FIG. 4 is a graph showing frequency / sound pressure characteristics of a speaker system using the speaker cabinet.
FIG. 5A is a front view showing an example of a conventional speaker cabinet, and FIG. 5B is a perspective view showing the same speaker cabinet.
FIG. 6A is a front view showing another example of a conventional speaker cabinet, and FIG. 6B is a perspective view showing the speaker cabinet.
[Explanation of symbols]
Reference Signs List 1 speaker cabinet 2 front cabinet, 2a baffle, 2b trunk, 2c groove 2d screw insertion hole, 2e screw hole 3 rear cabinet, 3a rear plate, 3b trunk, 3c tenon 3d handle 4 duct 5 speaker 6 screw 7 nut 10 Speaker cabinet 10a Baffle 11 Duct 12 Speaker cabinet 13 Main box 14 Sub box 15 Baffle 16 Sound board 17 Main sound duct 18 Sound grill 19 Sub sound duct 20 Screw rod 21 Screw receiving cover 22 Screw receiving 23 Volume adjustment scale 24 Friction member 25 Duct volume variable member 26 Sound release hole

Claims (5)

The torso of the front cabinet with the same cross-sectional shape extending rearward from the baffle on the front and the rear cabinet is opened, and the torso of the same cross-sectional shape extending forward from the rear panel and the rear cabinet with the front open. In a speaker cabinet which is assembled so as to be overlapped, a duct is formed by a gap between the body portions with a spacer interposed between the body portions. 2. The speaker cabinet according to claim 1, wherein the spacer is formed by a convex shape provided on an outer surface of a body portion arranged inside or a convex shape provided on an inner surface of the body portion arranged outside. 3. A mortise is formed in a convex shape formed on one trunk of the front cabinet or the rear cabinet, and the tenon fits into a groove formed on the other trunk of the front cabinet or the rear cabinet. 2 speaker cabinet. The speaker cabinet according to any one of claims 1 to 3, wherein the trunk of the rear cabinet is arranged inside the trunk of the front cabinet, and the port of the duct is located at the rear of the cabinet. The speaker cabinet according to any one of claims 1 to 4, wherein by making the overlapping length of the two body portions variable, it is possible to simultaneously change the internal volume of the cabinet and the duct length.

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