JPH0917174A - Electronic equipment - Google Patents

Abstract

PURPOSE: To prevent sound interruption and a read error due to vibration from speakers in a cassette-type tape recorder with radio, housing the speakers and a disk player in a common cabinet. CONSTITUTION: A number of sound-absor bing holes 58 with specific dimensions are formed at a recessed part 31 of a mounting substrate 20 of a disk player 13 to make the mounting substrate 20 to be a sound-absorbing structure to absor b air vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device, and more particularly to an electronic device in which a disk player and a vibration source are housed in a common cabinet.

[0002]

2. Description of the Related Art A conventional cassette type tape recorder with a radio is constructed, for example, as shown in FIG. 10, and the left and right speaker boxes 3 are connected to both sides of a main body cabinet 1 through connecting mechanisms 2. It was A disk player 4 is housed in the upper part of the main body cabinet 1, and a tape deck 5 constituting a tape recorder is housed in the lower part thereof.

[0003]

According to such a conventional cassette type tape recorder with a radio, it becomes difficult for the vibrations from the speakers in the left and right speaker boxes 3 to be transmitted to the main body cabinet 1. Does not adversely affect the disc player 4 in the main body cabinet 1. On the other hand, when the left and right speakers and the disc player are housed in a common cabinet, the vibrations from the speakers are transmitted to the disc player, which causes the signal reading mechanism of the disc-shaped recording medium of the disc player to be read. It will cause vibration.

In order to prevent a signal reading error due to such vibration, it may be possible to support the signal reading mechanism through a vibration damping mechanism, for example. With such a support structure, the vibration transmitted through the system from the speaker to the cabinet and the support of the reading mechanism section is blocked. However, if the size of the entire cabinet, especially the size of the common cabinet, is reduced and the output of the speaker is increased, the reading mechanism of the disc player will be affected by the vibration caused by driving the speaker, and the vibration will be damped. There is a problem that the above-mentioned adverse effect cannot be completely prevented by the support of the formula.

The present invention has been made in view of the above problems, and prevents the vibrations from the vibration source from being transmitted to the disk players housed in a common cabinet, thereby reading. It is an object of the present invention to provide an electronic device that prevents the mechanical portion from being adversely affected.

[0006]

According to the present invention, in an electronic device having a disk player and a vibration source housed in a common cabinet, sound is absorbed in the vicinity of the disk player so as to absorb the vibration from the vibration source. The structure is arranged.

The sound absorbing structure may be composed of a mounting base of a disc player, and a large number of holes may be formed in the mounting base to form a sound absorbing structure.

The sound absorbing structure is particularly 100-200H.
The holes may be dimensioned to absorb air vibrations at frequencies of z.

The read head of the disc player may be supported by a mounting base constituting the sound absorbing structure via a damper.

The vibration source arranged with the disc player in the common cabinet may be a speaker.

[0011]

The vibration from the vibration source is absorbed by the sound absorbing structure and is prevented from being transmitted to the disc player.

[0012]

1 shows the internal structure of a cassette-type tape recorder with a radio according to an embodiment of the present invention. The cassette-type tape recorder with a radio is equipped with a common cabinet 10. The left and right speakers 11, 12 are housed in the left and right parts of the cabinet 10. Further, the disc player 1 is provided in the upper part of the cabinet 10 at the substantially central part.
Three are arranged. A handle 14 is attached to the cabinet 10 via an attachment connecting member 15 at the upper portion of the disc player 13 so that the cassette 14 recorder with a radio can be carried by the handle 14.

2 to 4 show the structure of the disc player 13 provided in the upper part of the cabinet 10, particularly in the central portion of the cabinet 10. The disc player 13 has a mounting base 20. The base body 20 is adapted to be attached to a portion of the opening 21 formed in the upper part of the cabinet 10. That is, the mounting base 20 is provided with arms 22 extending downward on both sides thereof, and the lower end side of the arm 22 is bent laterally to form a mounting piece 23.

The mounting piece 23 is adapted to be mounted via a rubber boot 24 on a mounting leg 25 which is connected to the cabinet 10. The structure of support by the rubber boots 24 is as follows.
It is similar to the structure for supporting 0 (see FIGS. 7 and 8). Further, projections 26 and 27 are provided so as to face the mounting piece 23 and the mounting leg 25, respectively,
A damper 28 is interposed between the protrusions 26 and 27 so as to damp lateral vibrations.

In place of the vibration-proof support structure of the mounting base 20 using the rubber boots 24 and 28, a cushioning material such as flexible rubber or foamed polyethylene is interposed between the mounting base 20 and the cabinet 10 to prevent vibration. It may be a support structure.

The inside of the mounting base 20 is formed with a concave portion 31, and an opening / closing lid 32 is attached so as to cover the concave portion 31 so as to be openable and closable. A pressing disc 33 is supported on the opening / closing lid 32.

An opening 36 is formed at the bottom of the recess 31 of the mounting base 20, and a turntable 37 is inserted from below through the opening 36. The turntable 37 is provided with a conical protrusion 38 at the center thereof so that a disc-shaped recording medium 60, which will be described later, can be positioned. An optical pickup 39 is arranged in the opening 36 so as to be movable in the radial direction with respect to the turntable 37. The turntable 37 and the optical pickup 39 are covered by a common cover 40. The cover 40 is adapted to match the shape of the opening 36.

Further, as shown in FIGS. 5 and 6, the recess 31 of the mounting base 20 has a plurality of small sound absorbing holes 5 as shown in FIG.
8 are formed. The sound absorbing hole 58 allows the mounting base 20 to form a sound absorbing structure.

The mounting substrate 20 and the disk-shaped recording medium 60
Due to the influence of the natural frequency and the like of the sound absorbing structure 58, the size of the sound absorbing hole 58 of the sound absorbing structure is set in accordance with the frequency that is likely to cause an error when reading the signal from the disk-shaped recording medium 60. You can take measures against disconnection.

[0020] Now a d the diameter of the hole of the sound absorbing holes 58 as shown in Figure 6, the area of the hole and S = πd ^2/4, the resonance space volume, i.e. virtual constructed on each of the sound-absorbing holes 58 Assuming that the volume of the rectangular parallelepiped is V = L ² × L ′ and the depth of the sound absorbing hole 58 or the wall thickness of the concave portion 31 of the substrate 20 is t, the frequency f at which sound absorption is desired is expressed by the following equation.

[Equation 1] In this embodiment, the frequency to be absorbed is 100 to 20.
The size of the sound absorbing hole 58 is set to be within a range of 0 Hz, and more preferably to a value around 150 Hz.

Next, the chassis 45 arranged below the recess 31 of the base 20 will be described. The chassis 45 is a motor 46 for driving the turntable 37.
And a motor 47 for moving the optical pickup 39 on its lower surface. The motor 46 is the turntable 3
The output shaft 7 is directly driven to rotate.
On the other hand, the motor 47 linearly moves the optical pickup 39 in the radial direction of the turntable 37 via a speed reduction mechanism.

Next, the support mechanism of the chassis 45 will be described. As shown in FIG. 7, a support leg 50 is integrally provided on the bottom side of the base body 20 so as to project downward. The chassis 45 is supported via the boots 51. The lower portion of the rubber boot 51 is received by the flange 54 of the tapping screw 53, and the tapping screw 53 is screwed into the center hole of the support leg 50. The circumferential groove 52 formed in the rubber boot 53 is engaged with the notch 55 formed in the corner portion of the chassis 45, so that the chassis 45 is supported by the mounting base 20 in a vibration-proof manner. ing.

Therefore, the cassette type tape recorder with a radio according to this embodiment is equivalently shown in FIG. 9 in which speakers 11 and 12 are arranged in a common cabinet 10 and a base body 20 mounted on the cabinet 10 is protected. This mounting base 2 is elastically supported through a vibration support mechanism.
0 against rubber chassis 51 with chassis 4
The structure is such that 5 is supported by vibration isolation. The optical pickup 39 supported on the chassis 45
A damper 62 is interposed between the chassis 45 and the chassis 45 so as to suppress its lateral vibration.

In the above structure, the disk-shaped recording medium 60 is placed on the turntable 37, and the motor 4
When the disk-shaped recording medium 60 is rotationally driven by the turntable 37 by means of 6, the concave portion 31 of the mounting substrate 20 is
The disk-shaped recording medium 60 is rotated inside.
Moreover, the signal recorded on the lower surface of the disc-shaped recording medium 60 is read by the optical pickup 39. Then, the read signal is processed and converted into an analog audio signal, and the speakers 11 and 1 are connected.
2 will be driven. Therefore, the sound is reproduced by the speakers 11 and 12.

FIG. 9 is an equivalent view of the vibration-proof mechanism of such a cassette type tape recorder with a radio, and is particularly characterized in that the mounting base 20 is provided with a sound absorbing structure by the sound absorbing holes 58. And Speaker 11,
An acoustic signal is generated by 12 and vibrations associated with such a signal are transmitted through the cabinet 10 to the mounting base 20 and the chassis 45. In this case, the vibration is interposed between the mounting base 20 and the chassis 45. The above-mentioned vibration is suppressed by the damper composed of the rubber boot 51.

On the other hand, for those which are transmitted to the disk-shaped recording medium 60 as air vibrations in the internal space of the cabinet 10, the sound absorbing holes 58 are attached to suppress the vibrations due to such air vibrations. The base body 20 is arranged between the storage portion of the disc-shaped recording medium 60 and the speakers 11 and 12.

In such a sound absorbing structure, a plurality of sound absorbing holes 58 are provided in the cabinet of the mounting base of the disc player 13.
Is formed as shown in FIGS. 5 and 6. As is clear from FIGS. 5 and 6, such a sound absorbing structure is a resonator-type sound absorbing body and has a hole 5 for a specific frequency.
A cylindrical hole having an axial dimension t of 8 and a diameter d of the hole 58 comprises a sound absorbing structure which resonates and absorbs its energy. In such a sound absorbing structure, the size of the sound absorbing hole 58 is 100 to 200 in this embodiment.
Air vibrations in the range of Hz, especially in the vicinity of 150 Hz, are effectively absorbed.

As described above, the cassette-type tape recorder with a radio of the present embodiment produces the recording signal of the disc-shaped recording medium 60 when the disc-shaped recording medium 60 is reproduced by the acoustic signal generated by itself in the common cabinet 10. Considering that a reading error occurs and the sound is cut off,
Therefore, in order to prevent such a defect, the above-mentioned reading error is prevented by providing a resonator sound absorber made up of the mounting substrate 20 provided with the sound absorbing hole 58 in the signal reading mechanism of the disk-shaped recording medium 60. It is something that is done.

Therefore, it is possible to reduce the sound breakage due to the reading error of the signal of the disc-shaped recording medium 60, and to improve the sound pressure level by 3 to 4 dB. Further, since the resonator sound absorbing body can be formed only by forming the sound absorbing holes 58 in the mounting base 20, it is possible to easily take measures against sound break without changing the basic structure. The sound absorbing structure composed of such a mounting base 20 is the speaker 1
It is clear that it has an effect not only on acoustic air vibrations from Nos. 1 and 12, but also on other vibrations.

[0030]

As described above, according to the present invention, the sound absorbing structure is arranged near the disc player so as to absorb the vibration from the vibration source.

Therefore, it becomes possible to absorb the vibration transmitted from the vibration source to the disc player as the air vibration by the sound absorbing structure, and the reading error of the disc-shaped recording medium of the disc player due to the air vibration accompanying the vibration. Is prevented.

According to the structure of the sound absorbing structure by forming a large number of holes in the mounting base of the disc player, the sound absorbing structure can be formed by simply forming the holes in the mounting base, and the sound absorbing structure is simple. Can be configured.

When the size of the hole is set so that the sound absorbing structure absorbs the air vibration of the frequency of 100 to 200 Hz, it becomes possible to effectively absorb the air vibration of the frequency in this band, Air vibration near the natural frequency of the disk-shaped recording medium can be effectively absorbed.

According to the structure in which the read head of the disk player is supported by the mounting base constituting the sound absorbing structure via the damper, the sound absorbing structure can absorb the vibration transmitted in the form of air vibration. While you can
The damper supporting the read head makes it possible to absorb vibrations transmitted to the read head via the mounting substrate.

When the vibration source is a speaker, it is possible for the sound absorbing structure to absorb air vibrations associated with driving the speaker.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing the overall configuration of a cassette type tape recorder with a radio.

FIG. 2 is a longitudinal sectional view of an essential part of a disc player.

FIG. 3 is an external perspective view of a portion of a disc player.

FIG. 4 is an exploded perspective view of a portion of a disc player.

FIG. 5 is a transverse cross-sectional view of a main part of a mounting base of a disc player.

FIG. 6 is an external perspective view of a main part of a mounting base.

FIG. 7 is an exploded perspective view showing a support structure for a chassis.

FIG. 8 is a vertical cross-sectional view showing a support structure for a chassis.

FIG. 9 is a longitudinal sectional view equivalently showing an anti-vibration support structure of the disc player.

FIG. 10 is a front view of a conventional cassette type tape recorder with a radio.

[Explanation of symbols]

 10 cabinet 11 speaker (left) 12 speaker (right) 13 disc player 14 handle 15 mounting connecting member 20 mounting base 21 opening 22 arm 23 mounting piece 24 rubber boot 25 mounting leg 26, 27 protrusion 28 damper 31 recess 32 opening / closing lid 33 Presser disk 36 Opening 37 Turntable 38 Conical protrusion 39 Optical pickup 40 Cover 45 Chassis 46 Motor (for driving the turntable) 47 Motor (for moving the pickup) 50 Support leg 51 Rubber boot 52 Circumferential groove 53 Tapping screw 54 Flange 55 Cut 58 Sound absorbing hole 60 Disc-shaped recording medium 62 Damper

Claims (5)

[Claims] 1. An electronic device in which a disk player and a vibration source are housed in a common cabinet, and a sound absorbing structure is arranged near the disk player so as to absorb vibrations from the vibration source. Electronics. 2. The electronic device according to claim 1, wherein the sound absorbing structure comprises a mounting base of the disc player, and a plurality of holes are formed in the mounting base. 3. The electronic device according to claim 1, wherein the size of the hole is set so that the sound absorbing structure absorbs air vibrations having a frequency of 100 to 200 Hz. 4. The electronic device according to claim 1, wherein a read head of the disk player is supported by a mounting base forming the sound absorbing structure via a damper. 5. The electronic device according to claim 1, wherein the vibration source is a speaker.