JPH1173723A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an optical disk recording/reproducing device preventing the vibration of the optical disk at the time of high speed rotation. SOLUTION: A turntable 7 accepting the optical disk 3 is provided on a rotary shaft 1a of a spindle motor 1 when the information signal is recorded/ reproduced by using the optical disk 3. In this case, the outside diameter of this turntable 7 is formed to be equivalent to the outside diameter of the optical disk 3, and the weight thereof is made larger than that of the optical disk 3, and also the spindle motor 1 is disposed on a chassis 5 so as placing upside and the turntable 7 is disposed thereon placing downside. Then, the optical disk 3 is mountable on the lower surface of the turntable 7, and an optical pickup unit 6 for recording/reproducing the information of the optical disk 3 is disposed on the lower side of the optical disk 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical disk recording / reproducing apparatus. More specifically, the present invention relates to an optical disk recording / reproducing apparatus for recording / reproducing an information signal using an optical disk, wherein the vibration during rotation of the optical disk is prevented.

[0002]

2. Description of the Related Art A conventional optical disk recording / reproducing apparatus is shown in FIGS. FIG. 2 is a perspective view, and FIG. 3 is a sectional view.
In a conventional optical disk recording / reproducing apparatus, as shown in FIG. 3A, a disk 2 is fixed to a rotating shaft 1a of a spindle motor 1, and the spindle motor 1 and the disk 2 are connected as shown in FIG. It is mounted on a chassis 5 with the disk 2 up and the spindle motor 1 down. The optical disk 3 is placed on the disk 2 and fixed by the chucking plate 4.

An optical pickup unit 6 is provided on a chassis 5 below the optical disk 3 so as to face the optical disk 3. As shown in a perspective view of FIG. 2, the optical pickup unit 6 can be moved in the radial direction of the disk 3 by a sled motor 9 via a rack 8 to perform recording and reproduction on the disk 3.

[0004]

In the above-mentioned conventional optical disk recording / reproducing apparatus, in order to improve the performance, the rotation speed of the optical disk is increased to 2, 4, 8, 12 times, and the data transfer speed is increased. Accelerated. Up to now, vibrations of the optical disk have been suppressed by devising a structure such as a chassis of a mechanism in the apparatus for a rotation speed of about 2 to about 8 times. However, when the rotation of the optical disk becomes 12 times or more, the vibration of the optical disk increases.

As shown in FIG. 3B, the optical disk 3
However, when the amount of ink printed on the optical disc is not uniform, the weight balance is lost and causes vibration during high-speed rotation. When the optical disk is vibrated, it becomes difficult to read the signal by the pickup, and the access time and the like deteriorate. In the worst case, the optical disk may be destroyed.

[0006] There are two types of rotation speed of the optical disk in the optical disk recording / reproducing apparatus. One is CLV (Co
In an nstant linear velocity (constant linear velocity) method, the number of rotations is large during recording / reproducing on the inner periphery and small during recording / reproducing on the outer periphery, and the linear velocity of recording / reproducing is always controlled to be constant. On the other hand, the other is CAV (Constant
Angulor Velocity: The rotation speed is constant, and there is no difference in the rotation speed at the time of recording / reproduction on the inner and outer circumferences, and the rotation speed is always constant.

In the CLV system, the rotation speed at the time of CD-DA (1 × speed) is 530 rpm for the inner circumference and 200 rpm for the outer circumference. At this time, the magnification of the inner circumference and the outer circumference is about 2.5 times. On the other hand, in the CAV method, if the outer circumference is set to 32 × speed, the inner circumference becomes 32 / 2.5 ≒ 13, and 1
It becomes 3 times speed. In order to increase the outer circumference to 32 × speed by the CAV method, the number of rotations is 530 × 13 = 6890 rpm.
As described above, when the rotation speed is high, the vibration increases as described above, and there is a problem that it is difficult to read the information signal.

An object of the present invention is to provide an optical disk recording / reproducing apparatus capable of suppressing vibration even at high speed rotation in view of the above-mentioned conventional problems.

[0009]

According to an optical disk apparatus of the present invention, a turntable for receiving an optical disk is provided on a rotating shaft of a spindle motor in an optical disk recording / reproducing apparatus for recording / reproducing an information signal using an optical disk.
The outer diameter of the turntable is made equal to the outer diameter of the optical disk, the weight of the turntable is made larger than that of the optical disk, the spindle motor is set up, the turntable is set down, and the turntable is placed in a chassis. An optical pickup unit that can be attached to the lower surface of the table and records and reproduces information on the optical disk is provided below the optical disk.

With this configuration, even if the spindle motor rotates at a high speed, vibration can be suppressed without being affected by the imbalance of the weight of the disk due to the heavy turntable.

[0011]

FIG. 1 is a sectional view showing an embodiment of the present invention. In the present embodiment, as shown in FIG. 1A, a turntable 7 is fixed to a rotating shaft 1a of a spindle motor 1. The turntable 7 has the same outer diameter as the optical disk 3 and the optical disk 3 (weight about 15).
It is formed heavier (several hundred grams) than g), and has a sufficient rotational balance.

As shown in FIG. 1B, the spindle motor 1 and the turntable 7 have a chassis 5 with the turntable 7 down and the spindle motor 1 up.
Attached to. The turntable 7 can fix the optical disk 3 with the chucking plate 4.
The optical pickup unit 6 is disposed on the chassis 5 below the turntable 7 so as to face the disk 3 on the turntable 7. Incidentally, the fact that the optical pickup unit 6 can move in the radial direction of the optical disk 3 is the same as in the conventional example shown in FIGS.

In the embodiment thus constructed, the optical disk 3 is fixed to the turntable 7 by the chucking plate 4, the optical disk 3 is driven to rotate together with the turntable 7 by the spindle motor 1, and the information is read by the pickup unit 6. Is recorded or reproduced. At this time, even if the optical disc 3 has an imbalance in weight, the turntable 7 which is heavier than the optical disc 3 is less affected by the imbalance, and vibration during high-speed rotation can be suppressed.

Conventionally, when an optical disk is inserted into an apparatus, it is general to insert the optical disk with the printing surface facing up. In this embodiment, the spindle motor is mounted on the upper side and the pickup unit 6 is mounted on the lower side. As a result, there is no need to turn over the optical disc when inserting it.

[0015]

According to the optical disk recording / reproducing apparatus of the present invention, since the heavy turntable is provided on the spindle, the disk is less affected by the imbalance of the weight of the disk, and the vibration during high-speed rotation is small. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, in which (a) is a view showing a spindle motor and a turntable, and (b) is an assembly view showing a state where the spindle motor and the turntable are attached to a chassis. .

FIG. 2 is a perspective view showing a conventional optical disk recording / reproducing apparatus.

FIG. 3 is a diagram showing a conventional optical disk recording and reproducing apparatus;
(A) is a diagram showing a spindle motor and a turntable,
(B) is an assembly drawing.

[Explanation of symbols]

 Reference Signs List 1 spindle motor 2 disk 3 optical disk 4 chucking plate 5 chassis 6 pickup unit 7 turntable

Claims (1)

[Claims] An optical disk recording / reproducing apparatus for recording / reproducing an information signal using an optical disk is provided with a turntable for receiving an optical disk on a rotating shaft of a spindle motor, and the outer diameter of the turntable is made equal to the outer diameter of the optical disk. And make the weight larger than the optical disc,
In addition, the optical disc is mounted on the chassis with the spindle motor up and the turntable down, the optical disc can be attached to the lower surface of the turntable, and an optical pickup unit for recording and reproducing information on the optical disc is arranged below the optical disc. An optical disk recording / reproducing apparatus characterized by being provided.