JPH0737432Y2 - Audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a small audio device such as a portable tape recorder with a radio, and more particularly to a device for improving acoustic characteristics of a speaker used in the device. .

B. Outline of the Invention The present invention provides an acoustic space for reproduced sound emitted from a speaker unit between a chassis installed in a cabinet and the cabinet, and an acoustic tube continuously connected to the acoustic space. Is an audio device that is capable of expanding the low-frequency reproduction characteristics of the speaker.

C. Conventional Technology Conventionally, audio devices such as tape recorders with radio have been downsized in order to be portable or to save installation space. When the device is downsized, the speaker housed in the cabinet forming the device body is also downsized, and the cabinet is downsized. Therefore, it is not possible to sufficiently obtain the low frequency characteristic of the sound reproduced by this sound device.

D. Problems to be Solved by the Invention Therefore, the present invention aims to provide an audio device capable of good low-frequency reproduction without inhibiting miniaturization of the audio device such as a tape recorder with a radio. Proposed.

E. Means for Solving the Problems In order to achieve the above-mentioned object, an audio device according to the present invention is a cabinet that is formed by joining a pair of front cabinet halves and rear cabinet halves together. A print which is disposed in the cabinet so as to face the rear cabinet half body, constitutes a speaker box portion together with the rear cabinet half body, and is provided with an amplifier circuit or the like on the surface side facing the front cabinet half body. A chassis to which a substrate is attached at least, and a speaker unit disposed in the cabinet are provided, and in the speaker box portion, an acoustic space for reproduced sound emitted from the speaker unit is provided,
An acoustic pipe is provided so as to be continuous with the acoustic space and communicate with a sound emission port provided in the front cabinet half.

F. Action In the audio device according to the present invention, the reproduced sound emitted from the speaker unit arranged in the cabinet is emitted to the acoustic space in the speaker box section and propagated to the acoustic pipes continuous in this acoustic space. It The reproduced sound propagated to the acoustic tube is emitted to the outside of the cabinet via a sound emission port provided in the front cabinet half body.

Then, the reproduced sound emitted from the speaker unit to the acoustic space is enhanced by the acoustic space. In addition, the phase of the reproduced sound that is propagated through the acoustic tube is adjusted and emitted from the sound emission port, and together with the reproduced sound that is emitted directly from the speaker unit to the outside of the cabinet, the acoustic sound can be enhanced. .

G. Examples The following will describe specific examples in which the present invention is applied to a tape recorder with a radio.

As shown in FIG. 3, a tape recorder with a radio to which the present invention is applied includes a magnetic head device, a tape drive device, and other mechanical parts that compose the tape recorder unit 1, and a tuner unit of a radio receiver and the above-mentioned unit. A chassis 3 to which a printed circuit board 2 having an electric circuit such as an amplifier circuit for amplifying a reproduction signal reproduced by a tape recorder and a reception signal received by the radio receiver is attached, and the chassis 3 are housed and arranged. The cabinet 6 is composed of a pair of front cabinet half body 4 and rear cabinet half body 5, and a first speaker unit 7.

The chassis 3 is formed by integrally molding synthetic resin, and a support column 8 for mounting a mechanical section is provided on the front side facing the front side of the device main body when housed in the cabinet 6 constituting the main body of the apparatus. A large number of support columns 9 for mounting the printed circuit board 2 are erected, and the magnetic head device, the tape drive device, and other mechanical parts forming the tape recorder unit 1 and the printed circuit board 2 are mounted via the support columns 8 and 9.
Further, on the bottom surface side of the chassis 3, there is integrally formed a battery housing portion 10 which is housed via a battery loading / unloading opening provided in the bottom surface portion of the cabinet 6. Further, as shown in FIG. 4, a rising peripheral wall 11 which forms a box-shaped space together with the main plane portion 3a of the chassis 3 is formed on the outer periphery of the rear side of the chassis 3.

As shown in FIG. 1, the chassis 3 having the rising peripheral wall 11 formed on the rear side has the end face of the rising peripheral wall 11 as shown in FIG.
The rear cabinet half body 5 formed in a box shape is housed in the rear cabinet half body 5 so as to abut against the inner surface of the rear wall 5a. Then, the chassis 3 includes a flat surface portion 3a of the chassis 3 and a rear wall of the rear cabinet half body 5.
The space is attached between 5a and 5a by the height of the rising peripheral wall 11. Rear wall 5a of this rear cabinet half 5
A speaker box portion 12 is formed in a space surrounded by the main surface portion 3a of the chassis 3 and the rising peripheral wall 11. In addition,
In order to maintain the hermeticity of the speaker box portion 12, a sheet-like packing 13 made of urethane home or the like is interposed between the abutting portions of the rising peripheral wall 11 of the chassis 3 and the rear wall 5a of the rear cabinet half body 5. .

Then, on the back side surrounded by the rising peripheral wall 11 of the chassis 3 and at a position close to one side of the chassis 3, as shown in FIG.
Is provided. The speaker unit mounting portion 14 is provided with a magnetic circuit portion accommodating recess 14a which is located on the main plane portion 3a of the chassis 3 and into which the magnetic circuit portion 7a of the first speaker unit 7 is fitted and arranged. In addition, a part of the rising peripheral wall 11 is used for the speaker unit mounting portion 14 so that the first
A partition wall portion 14b surrounding a rectangular support frame 7c supporting the diaphragm 7b of the speaker unit 7 is provided. The first speaker unit 7 disposed in the speaker unit mounting portion 14 has an engaging recess provided in the tip corner portion of the support frame 7c by fitting a part of the magnetic circuit portion 7a into the magnetic circuit housing recess 14a. The chassis 3 and the rear cabinet half body are formed by abutting and engaging 7d with the tip side of the rectangular speaker mounting peripheral wall 15 corresponding to the outer shape of the support frame 7c protruding from the rear wall 5a of the rear cabinet half body 5. It is attached between 5.

It should be noted that the rear wall 5a of the rear cabinet half 5 has a through hole for sound emission in a portion surrounded by the speaker mounting peripheral wall 15.
16 are drilled.

By mounting the first speaker unit 7 as described above, the speaker box portion 12 is kept airtight even in the mounting portion of the first speaker unit 7. That is, the speaker box section 12 is kept airtight by the diaphragm 7b of the first speaker unit 7 and the speaker mounting peripheral wall 15. Since the airtightness of the speaker box portion 12 is maintained, the reproduced sound radiated from the front surface side of the diaphragm 7b of the first speaker unit is stored in the cabinet 6 exclusively through the through holes 16 for sound emission. The reproduced sound emitted to the outside and emitted from the back side of the diaphragm 7b is exclusively emitted to the speaker box unit 12.

Also, as described above, the rear wall 5a of the rear cabinet half 5 is
In the speaker box portion 12 formed by a space surrounded by the main surface portion 3a of the chassis 3 and the rising peripheral wall 11, an acoustic space adjacent to the speaker unit mounting portion 14 and serving as a capacitance portion of the speaker box portion 12. 18 are composed. As shown in FIG. 1, this acoustic space 18 is formed by bulging downward a part 19a of the upper wall part 19 and a part of the lower wall part 20 of the rising peripheral wall 11 to form a U-shape. It is formed with a region surrounded by the bulging wall portion 20a and the rear wall 5a of the rear cabinet half body 5. That is, the acoustic space 18 is a sufficiently large capacity portion by surrounding a part of the lower wall portion 20 with the bulging wall portion 20a formed so as to bulge downward. The portion of the bulging wall portion 20a adjacent to the speaker unit mounting portion 14 is, as shown in FIG.
and is communicated with the speaker unit mounting portion 14.

Further, in the speaker box portion 12, a single acoustic tube that is continuous with the acoustic space 18 and is narrower than the acoustic space 18 portion.
18 are made up. The acoustic tube 18 is composed of an upper wall portion 19 that constitutes the rising peripheral wall 11 of the chassis 3, a lower wall portion 20, and a portion surrounded by the back wall 5a of the rear cabinet half body 5. In the upper wall portion 19 and the lower wall portion 20 which constitute the acoustic tube 21,
A plurality of partition plates 22 and 23 are projectingly provided so that the front ends thereof are alternately overlapped with each other in opposite directions. By alternately providing the plurality of partition plates 22 and 23 in this manner, a relatively long acoustic tube 21 is formed in the speaker box portion 12. The end portion of the acoustic tube 21 is connected to a rectangular tubular conduit 24 integrally formed with the chassis 3 at the other end portion of the chassis 3. The acoustic tube 21 is connected to the sound emitting port 25 provided on one side of the front cabinet half body 4 connected to the rear cabinet half body 5 through the conduit 24 as shown in FIG. .

With the above-described configuration, the reproduced sound emitted from the back side of the diaphragm 7b when the first speaker unit 7 is driven is emitted to the acoustic space 18, and further the acoustic tube 21.
Then, the phase is inverted through the acoustic tube 21 and the sound is emitted to the front side of the cabinet 6 through the sound emission port 25.

That is, in the speaker device according to the present invention, since the chassis 3 and the cabinet 6 constitute the buffless speaker box portion 12, the low-frequency reproduction characteristic of the reproduced sound emitted from the speaker can be expanded.

In the present embodiment, a pair of second and third speaker units 26 and 27 for the left and right channels are provided on the front cabinet half 4 side so as to enable stereo reproduction. Therefore, as the first speaker unit 7 attached to the rear cabinet half 5 side, one for low-frequency reproduction is used.

In the above-described embodiment, the first speaker unit 7 is arranged in the speaker box portion 12 formed between the chassis 3 and the rear cabinet half 5, and the sound is emitted from the back side of the diaphragm 7b. Although the sound is emitted into the speaker box portion 12, as shown in FIG. 5, it is arranged between the front cabinet half 4 and the chassis 3 so as to be disposed in the cabinet 6. You can In this case, in the first speaker unit 7, the diaphragm 7b is opposed to the main surface portion 3a of the chassis 3, and the reproduced sound emitted from the front surface side of the diaphragm 7b is emitted into the acoustic space 18 of the speaker box portion 12. You may make it attach so that it may be sounded. In this case, the sound emission through hole 16 provided in the rear cabinet half body 5 is closed, and the sound emission through hole is provided on the front cabinet half body 4 side.

Further, as shown in FIG. 5, the acoustic tube 21 is divided into a plurality of partitions from the main surface portion 3a of the chassis 3 and the rear wall 5a of the rear cabinet half 5 such that the tip sides thereof are alternately overlapped with each other in opposite directions. It is configured by projecting the plates 52 and 53. The acoustic tube 21 is set to have a length which is emitted from the front surface side of the diaphragm 7b of the first speaker unit 7 and emitted from the sound emission port 25 without changing the phase of the reproduced sound.

In each of the above-described embodiments, an example in which the present invention is applied to a tape recorder with a radio has been described, but the present invention can be widely applied to an audio device that requires a speaker.

H. Effect of the Invention As described above, in the audio device according to the present invention, the reproduced sound emitted from the speaker unit arranged in the cabinet is emitted to the acoustic space in the speaker box portion formed in the cabinet. Sound is emitted to the outside of the cabinet through the sound emission port provided in the front cabinet half so that it is emitted to the acoustic space from the speaker unit. The reproduced sound is enhanced to be emitted outside the cabinet. Therefore, it is possible to enhance the acoustic sound in combination with the reproduced sound directly emitted from the speaker unit to the outside of the cabinet. In particular, it is possible to expand the low frequency reproduction band of the reproduced sound. Therefore, even if a small speaker unit is used, sufficiently good low frequency reproduction can be performed.

In addition, the acoustic space and acoustic tube that make up the buffless speaker box section that enhances the reproduced sound emitted from the speaker unit constitute a chassis and a cabinet in which a printed circuit board or the like is mounted and which is arranged in the cabinet. Since it is configured between the rear cabinet half and
By providing the speaker box portion, it is possible to prevent the device itself from increasing in size.

[Brief description of drawings]

FIG. 1 is a transverse sectional view showing an embodiment of the present invention.
FIG. 1 is a perspective view of a tape recorder with a radio to which the present invention is applied, FIG. 3 is a perspective view showing an assembled state of a chassis and a cabinet, and FIG. 4 is a rear view of the chassis. FIG. 5 is a cross-sectional view showing another embodiment of the present invention. 2 ... Printed circuit board 3 ... Chassis 4 ... Front cabinet half 5 ... Rear cabinet half 6 ... Cabinet 7 ... First speaker unit 18 ... Acoustic space 21 ... Acoustic tube 25 ... Sound emission mouth

Claims (1)

[Scope of utility model registration request] 1. A cabinet formed by joining a pair of front and rear cabinet halves to each other by abutting the front cabinet half and a rear cabinet half, and a cabinet disposed opposite to the rear cabinet half and inside the cabinet, A speaker box is also provided, and a chassis to which at least a printed circuit board provided with an amplifier circuit and the like is mounted on the side facing the front cabinet half, and a speaker unit disposed in the cabinet, An acoustic space for the reproduced sound emitted from the speaker unit is provided in the speaker box section, and an acoustic tube that is continuous with the acoustic space and communicates with the sound emission port provided in the front cabinet half is provided. A sound device that is made up of.