JPH0428082A - Optical disk device - Google Patents

Abstract

PURPOSE:To regenerate an information signal with high definition satisfactorily by constituting this device with a vicous elastic member to be interposed between pedestals, a vibration detecting means, and a displacement blocking member. CONSTITUTION:When a disk with high mass eccentricity is reproduced, internal vibration in a horizontal direction is detected with an acceleration pickup 12, and when detected vibration arrives at magnitude exceeding decided one, the displacement blocking member 13 is driven and moved downward, which blocks the relative displacement of a first pedestal 7 with a second pedestal 8 by engaging the member with a recessed part 14 provided at the second pedestal 8. Therefore, such vibration is transmitted from the first pedestal 7 to a placing board 9 nearly as it is via the second pedestal 8, and further, a device foot 11, and the internal vibration in the horizontal direction of the disk with mass eccentricity is energy-diffused and attenuated to the second pedestal 8 with large mass and the placing board 9. Thereby, it is possible to regenerate the information signal with high-definition satisfactorily.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disk-based information recording medium (hereinafter referred to as a disk).
The present invention relates to an optical disc recording device, an optical disc reproducing device, and an optical disc recording/reproducing device for optically recording information on a disc or reproducing information recorded on a disc.

BACKGROUND OF THE INVENTION Conventional optical disk devices have a structure in which a first base on which an optical head, a spindle motor, etc. are mounted and a second base on which the first base is mounted, in order to isolate external vibrations. Although the structure included a viscoelastic member, it was not possible to suppress the internal vibrations that occur when playing a disc with an eccentric center of gravity, which adversely affected the reproduction of information signals and deteriorated the quality due to vibrations. Something happened.

An example of the above-mentioned conventional optical disc device will be described below with reference to the drawings.

3 and 4 are a plan view and a side view showing a state in which a conventional optical disc device is playing a disc,
5 and 6 are partially enlarged views of the side view shown in FIG. 4. FIG. In FIGS. 3 and 4, 1 is a disk on which information signals are recorded, 2 is an optical head for optically reproducing information on the disk l, and 3 is an optical head 2.
an optical head transport means for moving the optical head into position;
4 is a turntable for mounting the disk 1; 5 is a clamper for holding the disk 1 between the turntable 4; 6 is a spindle motor for rotationally driving the turntable 4; 7 is a transfer means 3. and a first base on which the spindle motor 6 is mounted, 8 a second base on which the first base 7 is mounted, and 9 a mounting base on which the second base 8 is mounted. , 10 is interposed between the first base 7 and the second base 8, as shown in detail in FIGS. 5 and 6, and is a viscoelastic member for connecting them so that they can be relatively displaced. The member 11 is a device foot.

Regarding the functions of the optical disk device configured in this way,
The operation will be explained below. A spindle motor 6 rotates with the disk 1 held between the turntable 4 and the clamper 5, and when the disk 1 rotates, the optical head 2 detects the information signal recorded on the disk 1.

Furthermore, this optical head 2 can be moved to a desired position on the surface of the disk 1 for reproduction by means of an optical head transfer means 3, and can be reproduced while continuously moving.

Furthermore, if vibration occurs in the mounting table 9 due to some influence and is transmitted to the second base 8 from the device feet 11, the vibration is attenuated by the viscoelastic member 10 and is not transmitted to the first base 7. It's getting harder.

Problems to be Solved by the Invention However, in the configurations shown in FIGS. 3 and 4, when playing a disc with a large eccentric center of gravity, internal vibrations occur due to the eccentric center of gravity, and the second base Even though the disc 8 is fixed, the first base 7 on which the disk 1, optical head 2, etc. are mounted vibrates freely, adversely affecting the reproduction of information signals and degrading the quality.

The present invention solves the above problem, and aims to provide an optical disc device that can suppress internal vibrations when they occur due to an eccentric center of gravity.

Means for Solving the Problems In order to solve the above problem u, the optical disc device of the present invention comprises:
A first base on which an optical head, a spindle motor, etc. are mounted, a second base on which the first base is mounted, and a base mounted between the first base and the second base. at least one viscoelastic member; vibration detection means for detecting vibration when the first base vibrates; base and second
and a displacement prevention member that prevents the base from being displaced relative to each other.

OPERATION Owing to the above-described structure, the present invention is not affected by external vibrations that are normally transmitted from the mounting table of an optical disk device, and also has an extremely eccentric center of gravity, which is present in about one out of every tens to hundreds of commercially available disks. Internal vibrations that occur when a large disc is played are also suppressed, making it possible to reproduce high-quality information signals.

Embodiment Hereinafter, an optical disc device according to an embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows an optical disc installation in a practical example of the present invention! FIG. 2 is an enlarged view of the main parts of the optical tisf device shown in FIG. 1. In FIG. 1, elements 1 to 11 have the same structure as that in FIG. 3. What is different from the configuration shown in FIG. 3 is that when the first base 7 on which the optical head 2, spindle motor 6, etc. are mounted vibrates, an acceleration pickup 12 is used to detect the vibration. The first base 7 is provided with a displacement prevention member 13 that prevents the first base 7 and the second base 8 from being displaced relative to each other in response to a detected signal.

The operation of the optical disc device configured in this way will be described below with reference to FIGS. 1 and 2. In FIG. 1, when reproducing a disc 1 with a large eccentric center of gravity, horizontal internal vibration occurs, but this internal vibration is detected by the acceleration pickup 12, and the detected vibration has a predetermined magnitude. When the displacement prevention member 13 is driven and moves downward, the recess 14 provided in the second base 8
The first base 7 and the second base 8 are engaged with each other to prevent relative displacement between the first base 7 and the second base 8.

Therefore, this vibration is transmitted from the first base 7 to the second base 8.
Furthermore, the horizontal internal vibrations of the eccentric disc are transmitted almost as they are to the mounting table 9 through the device legs 11, and the energy is dispersed and attenuated by the second base 8 and the mounting table 9, which have a large mass, so that the vibration can be carried out with good quality. Good information signal reproduction can be achieved.

In addition, instead of the vibration detected by the acceleration pickup 12 in the above embodiment, the displacement prevention member 13
A similar operation can be performed by configuring to control the .

Alternatively, the displacement preventing member 13 may be provided on the second base 8.

Effects of the Invention As described above, according to the present invention, there is provided an optical head for optically reproducing information on a disc, a motor for rotationally driving the disc, and a first motor equipped with at least the optical head and the motor. a base; a second base on which the first base is mounted; at least one viscoelastic member interposed between the first base and the second base; vibration detection means for detecting the vibration when the base of the vibration detection means, and according to the vibration detected by the vibration detection means,
By configuring an optical disc device with a displacement prevention member that prevents relative displacement of the first base and the second base, the influence of external vibrations that are normally transmitted from the mounting base of the optical disc device can be reduced. Moreover, the internal vibrations that occur when a disk with an extremely large eccentric center of gravity is thrown over a cliff are suppressed, and information signals can be reproduced with good quality and quality.

[Brief explanation of the drawing]

FIG. 1 shows an optical disc device according to an embodiment of the present invention! Figure 2 is an enlarged view of the main parts of Figure 1, Figures 3 and 4
The figures are a plan view and a side view showing an example of a conventional optical disk device, and FIGS. 5 and 6 are partially enlarged views of the optical disk device shown in FIG. 4. DESCRIPTION OF SYMBOLS 1... Disk, 2... Optical head, 6... Spindle motor, 7... First base, 8... Second base, 10... Viscoelastic member, 12... ... Acceleration pickup, 13... Displacement prevention member. Agent Yoshihiro Morimoto Figure 1 Figure 2 / 4 Figure 4 Figure 5 Figure 1

Claims (1)

[Claims] 1. An optical head for optically recording information on a disk-shaped recording medium or optically reproducing information recorded on the recording medium, and a motor for rotationally driving the recording medium. a first base on which at least the optical head and the motor are mounted; a second base on which the first base is mounted; and between the first base and the second base. at least one interposed viscoelastic member; a vibration detection means for detecting vibration when the first base vibrates; An optical disc device comprising a displacement prevention member that prevents a first base and a second base from being displaced relative to each other. 2. The optical disc device according to claim 1, wherein an acceleration pickup is used as the vibration detection means. 3. The optical disc device according to claim 1, wherein an optical head also serves as the vibration detection means.