JPH0529566Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a vibration isolation mechanism for a disc playback device that plays back information recording media such as compact discs.

(Prior art and its problems) For example, a device that plays back a disk, which is an information recording medium on which acoustic symbols are recorded, needs to perform stable playback in response to internal and external vibrations. It is well known that a vibration isolation mechanism is provided as a means of achieving this. In recent years, even portable audio equipment such as stereo radio cassette recorders have been equipped with disc playback devices for playing compact discs.

FIG. 3 is an external perspective view of a disc playback device mounted on a portable audio device such as a stereo radio cassette recorder, and FIG. 4 is a sectional view of the vibration isolation mechanism.

The disc reproducing apparatus A has a structure in which a sub-chassis 2 on which a signal reproducing section 4 is mounted is mounted on a chassis 1 via a plurality of vibration-proofing mechanisms 3.

The signal reproducing unit 4 includes a well-known reduction gear group 6 driven by a drive motor 5 attached to the lower part of the sub-chassis 2, and an optical system that moves in both X ₁ and X ₂ directions by the pinion of this reduction gear group 6. As the compact disk 9 is placed on a turning table-like chuck 8 driven by a spindle motor, the optical pickup section 7 moves the disk in the radial direction (X ₁ , The signal recorded on the compact disc 9 is reproduced by relatively scanning in the _X2 direction).

As shown in FIG. 4, the vibration isolating mechanism 3 has a structure in which a filler material 3b such as oil or grease is sealed in a diaphragm 3a formed of an elastic member such as rubber.
If the amount of deflection of a exceeds 20%, there is a problem that permanent deformation occurs due to changes over time and the vibration damping function deteriorates. In addition, the vibration isolation mechanism 3 depends on the rubber material, hardness, shape,
Setting the resonance frequency ( ₀ ) is difficult because there are many unstable factors such as the wall thickness and the grease enclosed. Therefore, there were problems such as difficulty in setting the resonant frequency to around 20 Hz, which provides a vibration-proofing effect.

(Means for Solving the Problems) The present invention was made in order to solve the above-mentioned problems. a vibration isolating mechanism including a coil spring disposed between the chassis and the vibration isolating rubber, and the coil spring is interposed between the chassis and the vibration isolating rubber, and the vibration isolating rubber The present invention provides a vibration isolating mechanism for a disc playback device, which supports a sub-chassis and locks the chassis to a protrusion formed protruding from the vibration-isolating rubber.

(Example) Fig. 1 is an external perspective view showing an embodiment of the vibration isolation mechanism of the disc playback device according to the present invention, and Fig. 2 A and B
FIG. 3 is a perspective view of rubber constituting a part of the vibration isolating mechanism, viewed from two directions.

The disc playback device B installed in a stereo cassette recorder or the like has a sub-chassis 12 mounted on a chassis 11 with a signal playback unit 14 mounted thereon via four anti-vibration mechanisms 13 arranged at each corner, similar to the above-mentioned conventional configuration. This is a configuration in which it is installed.

The signal reproducing section 14 includes a well-known reduction gear group 16 driven by a drive motor 15 attached to the lower part of the sub-chassis 12, and an optical gear meshed with a pinion 16a and rack 17a which serve as the output of this reduction gear group 16. It consists of a target pick-up 17. The rotation of the drive motor 15 causes the optical pickup 17 to move in both the X ₁ and X ₂ directions, and picks up the compact disk 9 placed on the chuck 8 which is rotationally driven by the spindle motor that serves as the disk drive section of the sub-chassis 12. The signal recorded on the compact disc 9 is reproduced by relatively scanning in the radial direction.

The vibration isolation mechanism 13 includes a coil spring 18 disposed on the chassis 11 and a rectangular vibration isolation rubber 19 disposed on the coil spring 18.

The concrete shape of the vibration isolating rubber 19 is as shown in FIG. A shaft-shaped protrusion 19b erected perpendicularly to the
19c and 19d are formed to protrude, respectively.

This anti-vibration rubber 19 is attached to the sub-chassis 12.
At the four corners of the slit 19a
is placed on the coil spring 18 on the chassis 11 while holding the sub-chassis 12. At this time, the projection 19b on the upper surface penetrates and locks the top plate 11a1 of the support section 11a that is set up from the chassis ₁₁ , and the projections 19c and 19d on both sides are attached to the top plate 11a1 of the support section 11a that is set up from the chassis 11. By fitting into the recesses 11a ₃ and 11a ₃ of the side plates 11a ₂ and 11a ₂ , respectively, the sub-chassis 12 is supported with respect to the chassis 11 with its position restricted in the vertical and horizontal directions.

In this way, the sub-chassis 12 is connected to the chassis 1.
1, when the chassis 11 is driven, the vertical direction (Z ₁ , Z ₂ ) and the horizontal direction (X ₁ ,
X ₂ ), main vibrations in the longitudinal direction (Y ₁ , Y ₂ ) are absorbed by the coil spring 18, and vibrations around the resonance frequency of the coil spring 18, such as low frequency vibrations caused by pickup movement and disk rotation, are absorbed by the coil spring 18. ,
It is effectively absorbed by the protrusions 19b, 19c, 19d of the vibration isolating rubber 19 and the locking parts of the chassis 11 that inhibit these. In other words, by setting the resonance frequency ( ₀ ), which is the most important factor regarding the vibration isolation mechanism of the device, by using the spring constant of the coil spring 18, the degree of freedom in setting ₀ is increased, and the amount of resonance (0) generated at the resonance point is increased. By applying Q ₀ ) to the protrusion of the vibration isolating rubber 19 as a shearing force, it is possible to suppress the increase in the resonance frequency and reduce the amount of resonance.

(Effects of the invention) As detailed above, the vibration isolation mechanism of the disc playback device of the invention suppresses the increase in the resonance frequency by the cooperative action of the coil spring and the vibration isolation rubber, and also reduces the amount of resonance. It has a great vibration-proofing effect, and the resonant frequency can be easily set using a coil spring, which increases the degree of freedom when designing, and allows vibration absorption to be achieved at a low cost as per the set value. There are practical benefits.

[Brief explanation of the drawing]

Figure 1 is an external perspective view showing an embodiment of the vibration isolation mechanism of the disc playback device according to the present invention, and Figures 2A and B
FIG. 3 is a perspective view of the outer appearance of a conventional disc playback device, and FIG. 4 is a sectional view of the vibration isolating mechanism. 11... Seam, 12... Sub chassis, 1
3... Anti-vibration mechanism, 14... Signal reproducing section, 18...
Coil spring, 19... Anti-vibration rubber, 19b, 19
c, 19d... protrusion.

Claims (1)

[Scope of utility model registration request] The device comprises a chassis of the device, a sub-chassis in which a disk drive unit and a disc playback unit are mounted, and a vibration-proofing mechanism made of a coil spring and vibration-proof rubber arranged between the chassis and the sub-chassis, and
The coil spring is interposed between the chassis and the vibration isolating rubber, the vibration isolating rubber supports the sub chassis, and the chassis is locked to a projection formed protruding from the vibration isolating rubber. A vibration isolation mechanism for a disc playback device characterized by: