JPH0610554Y2 - Optical disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention irradiates a laser beam emitted from a semiconductor laser on an optical disk on which an information signal such as a musical tone signal is recorded to read and reproduce the information signal. The present invention relates to an optical disc player.

[Background Art and its Problems] An optical disc player has a disc table integrally attached to a spindle shaft that is rotationally driven by a center spindle drive motor, and an optical disc is mounted on the disc table to maintain a constant linear velocity. The optical pickup device incorporating a semiconductor laser is made to run in the normal direction of the recording track formed on the optical disc from the inner peripheral side to the outer peripheral side of the optical disc while being rotated by A laser beam emitted from a laser is vertically irradiated from the lower surface side of the optical disc to track a recording track, and a predetermined information signal recorded on the recording track is read and reproduced.

By the way, in the optical disc player, since an optical disc on which a predetermined information signal is digitized and recorded by using a laser of a single wavelength is read by the laser, high density recording on the optical disc is performed. It is possible to read and reproduce this. So, for optical digital audio discs,
A so-called compact disc having a diameter of 12 cm has been proposed, and an optical disc player for reproducing the so-called compact disc has been provided.

In this type of optical disc player, since the optical disc as a recording medium is small, attempts have been made to downsize the player itself in accordance with this small optical disc. The miniaturization enables the construction of a portable optical disc player and the construction of an optical disc player mountable in an automobile.

However, the optical disc player reads an information signal recorded on the optical disc at a high density while transferring an optical pickup device which incorporates a semiconductor laser and irradiates the optical disc with a laser beam from the inner peripheral side to the outer peripheral side of the optical disc. Therefore, when a shock is applied to the optical pickup device, it easily vibrates and causes tracking deviation of the recording track due to the laser beam, which makes it impossible to read the information signal recorded at high density, resulting in loss of the reproduction signal and good reproduction. Cannot be done. Especially in a portable or car-mounted optical disc player,
It is exposed to shocks and vibrations during normal use. As a result, vibration is applied to the optical pickup device, and a reproduction signal is lost, and good reproduction cannot be performed.

Therefore, there is used an optical disc player provided with a cushioning mechanism in which a mechanism portion including a disc rotation drive device for rotating an optical disc and an optical pickup device is supported in a cabinet with an insulator such as a rubber damper interposed. ing.

By the way, since the conventionally used insulator has a directivity in a direction capable of exerting a shock absorbing effect,
It has a sufficient shock absorbing effect against a shock in a predetermined direction, and functions so that the tracking control for the optical pickup device to accurately scan the recording track of the optical disk operates stably. However, the insulator cannot achieve a sufficient shock absorbing effect for a shock from a direction other than the shock absorbing effect. Therefore, in order to realize a shock absorbing effect on the optical disc player from shocks from all directions, it is necessary to dispose an insulator exhibiting a shock absorbing effect in a predetermined direction so as to absorb the shock in each direction. There is. In order to absorb shocks in all directions in this way, it is necessary to arrange a large number of insulators in the player in different directions, which not only complicates the configuration but also increases the size of the player itself. Therefore, it becomes difficult to apply it to a portable device that requires miniaturization.

[Object of the Invention] Therefore, the present invention stabilizes control such as tracking control in which an optical pickup device accurately scans a recording track of an optical disc by absorbing and blocking or attenuating shocks and vibrations from all directions. The present invention has been proposed for the purpose of providing an optical disc player capable of performing good signal reproduction without signal loss and surely achieving miniaturization of the player itself.

[Means for achieving the purpose]

In order to achieve the above-mentioned object, the present invention forms a peripheral wall on a chassis in which a disk drive device and an optical pickup device are arranged, and a portion extending from a side surface to an upper surface of the peripheral wall has a viscoelastic body between elastic bodies. And a part extending from the side surface to the upper and lower surfaces of the peripheral wall is supported by the exterior cabinet with the layered body interposed therebetween.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

An optical disc player according to the present invention is shown in FIGS.
As shown in the figure, it has a chassis 2 which is mounted so as to be fitted in the exterior cabinet 1, and a center spindle drive motor 3 which constitutes a disk drive device is mounted on the lower surface of the substantially central portion of the chassis 2. . A center spindle shaft 4 is directly connected to the output shaft side of the center spindle drive motor 3 coaxially with the output shaft. A disc table 6 on which an optical disc 5 is mounted is attached to a portion of the center spindle shaft 4 that projects toward the upper surface of the chassis 2. Then, the optical disk 5 mounted on the disk table 6 is rotated by the rotational drive of the center spindle drive motor 3 so that the linear velocity becomes constant.

Further, on the chassis 2, an optical pickup device 7 for tracking operation of a recording track of an optical disc 5 mounted on the disc table 6 with a laser beam, and an objective lens 8 for transmitting the laser beam is provided as an optical pickup device. It is attached so as to face the disk 5. The optical pickup device 7 includes a support piece 9 on the upper surface side of the chassis 2.
A pair of guide shafts 10 arranged in parallel with each other through
A pickup driving motor 12, which is also inserted through and supported by the chassis 11 and is also mounted on the lower surface side of the chassis 2, is guided by the guide shafts 10 and 11 in the radial direction from the inner peripheral side to the outer peripheral side of the optical disc 5 to perform a transfer operation. To be done.

Between the pickup drive motor 12 and the optical pickup device 7, a first and a first reduction gear mechanism are provided between a worm gear 13 attached to the drive shaft of the drive motor 12 and a rack 14 attached to the lower surface side of the optical pickup device 7. The two gears 15 and 16 are connected to each other.

Around the chassis 2 in which the disk drive device and the optical pickup device 7 are arranged as described above, the chassis 2
The peripheral wall 17 is formed so as to be bent downward so as to ensure the mechanical strength of the. The chassis 2 is attached such that the peripheral wall 17 is fitted into an engaging groove portion 19 formed on the inner surface of the peripheral side wall 18 of the exterior cabinet 1.

By the way, in the present invention, the portion of the chassis 2 that contacts the exterior cabinet 1, that is, the peripheral wall 1 of the chassis 2.
7 and a peripheral side wall 18 of the exterior cabinet 1, a viscoelastic body 20 such as a silicone resin having viscoelasticity and high compliance and elastic bodies 21 and 21 such as a rubber material are laminated in three layers as shown in FIG. The sheet-shaped layered product 22 is attached to the substrate. The layered product 22 used in the present invention
Since the viscoelastic body 20 having a large compliance is laminated between the elastic bodies 21 and 21, the viscoelastic body 20 has a damping effect of resonance by the action of the viscoelastic body 20 and the viscoelastic body 20 and the elastic bodies 21 and 21. A significant vibration absorbing effect can be exhibited by stacking the layers.

The layered body 22 interposed between the exterior cabinet 1 and the chassis 2 is the peripheral side wall 1 of the exterior cabinet 1.
8 is provided over the entire width of the engaging groove portion 19 and is configured to wrap the peripheral wall 17 of the chassis 2 fitted and locked in the engaging groove portion 19 from above and below and from the side surface. By supporting the chassis 2 from the upper and lower sides and the side surfaces by the layered body 22 in this manner, vibration absorption and braking effects can be exerted in any of the three-dimensional directions of the upper and lower sides and the side surface of the player.

In addition, in the above-described embodiment, the layered body 22 is provided over the entire circumference of the chassis 2.
The same effect can be achieved by providing only in a portion that contacts the exterior cabinet 1.

[Effect of device]

As described above, according to the present invention, the portion extending from the side surface to the upper and lower surfaces of the peripheral wall of the chassis is wrapped with a layered body in which viscoelastic bodies are laminated between elastic bodies, and the peripheral wall is interposed with the layered body interposed. Since it is configured to support the part extending from the side surface to the upper and lower surfaces of the exterior cabinet, it absorbs shocks in all directions applied to the cabinet,
In addition, it is possible to damp vibrations from any direction, realize a stable traveling operation of the optical pickup device, and stably perform tracking control of the recording track of the optical disc by the optical pickup device. Therefore, stable tracking scanning of the recording track can be performed and good signal reproduction without signal loss can be performed.

In particular, since the layered object used in the present invention is composed of a viscoelastic body and an elastic body, not only the impact applied to the player itself can be absorbed but also the resonance sharpness of the vibration applied to the player can be damped. It is possible to improve control characteristics such as stable tracking control of the optical pickup device in a use state.

Further, by adopting the structure using the layered body, it is possible to sufficiently reduce the size of the player itself without causing the shock absorbing mechanism to be complicated and upsized as in the case using the conventional insulator.

Furthermore, since it is provided with a structure for supporting a portion extending from the side surface of the peripheral wall of the chassis wrapped by the layered body to the upper and lower surfaces to the exterior cabinet, as shown in the above-mentioned embodiment,
The chassis can be supported by fitting the peripheral wall portion to the inner peripheral side of the exterior cabinet, and it is possible to eliminate the need to use screws or the like for supporting. It is possible to eliminate the vibration.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view showing a layered body. 1 ... Exterior cabinet 2 ... Chassis 3 ... Center spindle drive motor 6 ... Disk table 7 ... Optical pickup device 20 ... Viscoelastic body 21 ... Elastic body 22 ... Layered body

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Keiji Maruta, 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni-Inside Co., Ltd. (56) Bibliographic references Sho 51-9705 (JP, U) 55-11830 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A peripheral wall is formed on a chassis in which a disk drive device and an optical pickup device are arranged, and a portion extending from a side surface to an upper surface of the peripheral wall is wrapped with a layered body in which a viscoelastic body is laminated between elastic bodies. In addition, an optical disc player in which a part extending from the side surface to the upper and lower surfaces of the peripheral wall is supported by an exterior cabinet with the layered body interposed.