JPH0831161A - Portable cd player - Google Patents

Abstract

PURPOSE:To improve vibration resistance in a state of horizontally or perpendicularly placing the CD player or at the time of rolling. CONSTITUTION:An elastic member 11 is formed of butyl rubber to a shape obtd. by connecting an outer ring and an inner ring in a disk shape part. The inner ring of the elastic member 11 is supported in the state that the ring is held by a lower main body case 12 and an upper main body case 13. The outer ring is supported in the state that the ring is mounted and fitted at an elastic member fitting part 1b integral with a reproducing unit chassis 1. The elastic member S1 has a sufficient spring constant with the displacement of the inner ring with the outer ring in three directions orthogonal with each other. The reproducing unit chassis 1 supports a spindle motor 2 and optical pickup for rotating a disk and is supported in the main body case via the elastic member and an oil damper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable CD player, and more particularly to the structure of a vibration isolator for the portable CD player.

[0002]

2. Description of the Related Art Conventionally, in a portable CD player, C
A reproduction unit including a spindle motor that clamps and rotates D and an optical pickup that reads a recording signal is supported by a main body case via a vibration isolator to prevent skipping due to vibration.

An example of such a conventional portable CD player is shown in FIGS. Reference numeral 2 shown in the figure is a spindle motor, which is fixed to the reproducing unit chassis 1.
A turntable 3 is fixed to the rotary shaft of the spindle motor 2. The turntable 3 cooperates with a clamper (not shown) to hold and rotate the disc.

Reference numeral 4 denotes an optical pickup for reading a recording signal on the disc, which is slidably supported by the reproducing unit chassis 1. The lead screw 6 is rotatably supported by the reproduction unit chassis 1, and the rotation of the feed motor 5 fixed to the reproduction unit chassis 1 is transmitted via a gear train. The optical pickup 4 is engaged with the lead screw 6 and is fed in the disk radial direction by the rotation of the feed motor 5.

The reproducing unit chassis 1 holding the spindle motor 2 and the optical pickup 4 to which the turntable 3 is fixed and the feeding mechanism thereof are supported by a main body case (not shown) via three oil dampers 7. ing.

The cross section of the oil damper 7 is shown in detail in FIGS. 8 and 9. The damper main body 7a that constitutes the oil damper 7 is made of rubber in the shape of a rotating body, and the silicone oil 7b is enclosed in its hollow portion.

A groove is provided around the outer periphery of the intermediate portion of the damper body 7a, and the damper fitting portion 1a provided on the reproducing unit chassis 1 is fitted in the groove. A protrusion of the damper locking member 8 press-fitted into the lower body case 12 projects into the recess provided in the lower portion of the damper body 7a, and an upper body case 13 is provided in the recess provided in the upper portion of the damper body 7a. The boss extending from is rushing in.

A coil spring 9 is interposed between the damper body 7a and the damper locking member 8, and a conical coil spring 10 is interposed between the damper fitting portion 1a and the upper body case 13. Since the reproduction unit chassis 1 is thus supported via the damper and the spring, it is difficult for vibration to be transmitted from the main body case to the reproduction unit.

[0009]

In the above-mentioned conventional portable CD player, if the spring constant is lowered in order to lower the resonance frequency f _{0 of the} spring supporting the reproducing unit chassis, the posture of the reproducing unit is not stable and the case is When rolling, the lid, the case, and the disk rub against each other, and sound skipping occurs. Therefore, the spring constant must be increased, which causes a problem that vibration resistance deteriorates.

Further, when the CD player is placed vertically, there is a problem that a lateral load is applied to the damper body to cause eccentricity, the damper effect is reduced, the vibration isolation performance is deteriorated, and sound skipping is likely to occur. It was

The present invention has been made in view of the above points, and an object of the present invention is to provide a portable CD player having excellent vibration resistance against horizontal placement and vertical placement.

Another object of the present invention is to provide a portable CD player in which the disc does not come into contact with the case even when the case is rolled.

[0013]

The portable C of the present invention
The D player is a portable CD player in which a spindle motor having a disc rotation turntable fixed to a rotation shaft, a signal reading optical pickup, and a reproduction unit holding a drive mechanism thereof are supported by a main body case via a vibration isolation device. In addition to the vibration isolator, at least one elastic member having a substantial spring constant against displacements in three directions orthogonal to each other is arranged between the reproducing unit and the main body case.

Further, in the portable CD player, the elastic member is rubber, elastomer resin or metal spring.

[0015]

According to the portable CD player of the present invention,
In addition to the anti-vibration device, an elastic member having a substantial spring constant with respect to displacements in three directions orthogonal to each other is arranged between the reproducing unit and the main body case, so when the CD player is placed horizontally. The elastic member acts as a spring and a damper against the vertical vibration of the main body case, and has the effect of suppressing the vibration amplitude of the reproducing unit.

When the CD player is placed vertically, the stress due to the displacement of the elastic member prevents the eccentricity of the damper,
The damping effect of the damper is fully exerted.

When the CD player rolls, a force for maintaining the posture is generated on the disc by the gyro effect due to the rotation, but the elastic member generates sufficient stress for displacement in all directions, and the reproducing unit is main body. It is moved in the same way as the case, which prevents the disk and case from rubbing and causing skipping.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable CD player which is an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of essential parts showing a portable CD player according to an embodiment of the present invention, and FIG. 2 is a bottom view showing the portable CD player.

Reference numeral 2 shown in the drawing is a spindle motor, which is fixed to the reproducing unit chassis 1. A turntable 3 is fixed to the rotary shaft of the spindle motor 2.
The turntable 3 cooperates with a clamper (not shown) to hold and rotate the disc.

Reference numeral 4 denotes an optical pickup for reading the recording signal of the disc, which is slidably supported by the reproducing unit chassis 1. The lead screw 6 is rotatably supported by the reproduction unit chassis 1, and the rotation of the feed motor 5 fixed to the reproduction unit chassis 1 is transmitted via a gear train. The helical rack gear 4a fastened to the optical pickup 4 is engaged with the lead screw 6, and the rotation of the feed motor 5 causes the optical pickup 4 to be fed in the disk radial direction.

Thus, the reproducing unit chassis 1 holding the spindle motor 2 and the optical pickup 4 to which the turntable 3 is fixed and the feeding mechanism thereof are not shown via the three oil dampers 7, 7 ,. Supported by. The structure of the oil damper 7 is the same as that of the conventional one shown in FIGS. 5 to 9, and the conical coil spring 10 and the coil spring 9 are arranged above and below the oil damper 7 as in the conventional one.

As described above, the reproducing unit chassis 1 is supported by the main body case via the vibration damping device composed of the oil damper 7, the conical coil spring 10 and the coil spring 9. In this embodiment, the elastic member 11 is further provided. It is attached between the chassis 1 and the main body case.

As shown in FIG. 3, the elastic member 11 has a shape in which an outer ring and an inner ring are connected by a disc-shaped portion, and is made of butyl rubber in this embodiment. The inner ring of the elastic member 11 is supported by being sandwiched between the lower body case 12 and the upper body case 13, and the outer ring of the elastic member 11 is fitted in the elastic member fitting portion 1b integral with the reproducing unit chassis 1. It is supported.

The deformation in which the inner ring of the elastic member 11 is displaced vertically with respect to the outer ring becomes a bowl-shaped deformation of the disk-shaped portion, and a sufficient spring constant is provided due to the stress due to the deformation. Deformation in which the inner ring is eccentric with respect to the outer ring results in partial expansion and partial compression of the disk-shaped portion, and the stress due to the deformation has a sufficient spring constant.

Therefore, the reproducing unit chassis 1 supported via the elastic member 11 is applied with a sufficient reaction force against the displacement in the three directions orthogonal to each other, and the reproducing unit follows the movement of the main body case.

That is, as shown in FIG.
When the player is placed horizontally, the elastic member 11 acts as a spring and a damper against the vertical vibration of the main body case, and has the effect of suppressing the vibration amplitude of the playback unit. When the elastic member 11 is arranged in the vicinity of the concentrated load like the spindle motor 2 as in the embodiment, the effect is great.

As shown in FIG. 4 (b), when the CD player is placed vertically, the stress due to the displacement of the elastic member 11 prevents the eccentricity of the oil dampers 7, 7, ... It is fully demonstrated.

As shown in FIG. 4 (c), when the CD player rolls around the X axis or the Y axis, a force is generated on the disc to maintain its posture due to the gyro effect due to the rotation. Generates sufficient stress for displacement in all directions and moves the playback unit in the same way as the case of the main body, thereby preventing the disk and the case from rubbing and causing skipping.

Particularly, recently, in order to cope with skipping of sound, D-
The number of models equipped with a RAM and rotating a disk at a double speed is increasing, but when the disk is rotated at a double speed, the gyro effect becomes large and the elastic member 11 works effectively.

Although the embodiment is configured as described above, the invention is not limited to this. For example, instead of mounting one elastic member 11, it may be mounted in the vicinity of each of the three oil dampers.

Instead of butyl rubber, any elastic resin or a leaf spring made of metal having a low elastic coefficient can be used as the elastic member 11.

[0032]

According to the portable CD player of the present invention, in addition to the vibration isolator, an elastic member having a substantial spring constant against displacements in three directions orthogonal to each other is provided between the reproducing unit and the main body case. Since the CD player is placed horizontally, the elastic member acts as a spring and a damper against the vertical vibration of the main body case and has the effect of suppressing the vibration amplitude of the playback unit.

When the CD player is placed vertically, the stress due to the displacement of the elastic member prevents the eccentricity of the oil damper, and the vibration damping effect of the oil damper is sufficiently exerted.

Further, although the portable CD player is often carried around, even if the CD player rolls while being carried around, the elastic member moves the reproducing unit in the same manner as the case of the main body, so that the disk and the case rub against each other and the sound skips Is prevented from occurring.

[Brief description of drawings]

FIG. 1 is a plan view of essential parts showing a portable CD player according to an embodiment of the present invention.

FIG. 2 is a bottom view showing the portable CD player.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a perspective view showing an example of a usage state of the portable CD player.

FIG. 5 is a main part plan view showing an example of a conventional portable CD player.

FIG. 6 is a front view showing the portable CD player.

FIG. 7 is a bottom view showing the portable CD player.

8 is a sectional view taken along line BB in FIG.

9 is an enlarged sectional view showing a portion shown in FIG.

[Explanation of symbols]

1 playback unit chassis, 1a damper fitting part, 1b
Elastic member fitting part 2 Spindle motor 3 Turntable 4 Optical pickup 4a Helical rack gear 5 Feed motor 6 Lead screw 7 Oil damper, 7a damper body, 7b Silicon oil 8 Damper locking member 9 Coil spring 10 Conical coil spring 11 Elastic member 12 Lower body case 13 Upper body case

Claims (4)

[Claims] 1. A portable CD player in which a spindle motor having a disc rotation turntable fixed to a rotation shaft, a signal reading optical pickup, and a reproducing unit holding a driving mechanism thereof are supported by a main body case via a vibration isolation device. In addition to the vibration isolator, at least one elastic member having a substantial spring constant against displacements in three directions orthogonal to each other is arranged between the reproducing unit and the main body case. CD player. 2. The portable CD player according to claim 1, wherein the elastic member is rubber. 3. The portable CD player according to claim 1, wherein the elastic member is an elastomer resin. 4. The elastic member is a metal spring.
Portable CD player.