JP3019036B2 - Optical information recording / reproducing apparatus and optical information recording / reproducing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical information recording / reproducing apparatus for recording / reproducing information on / from an optical information recording medium and an optical information recording / reproducing method. More particularly, the present invention relates to an optical information recording / reproducing apparatus and an optical information recording / reproducing method for preventing a heat generated by a spindle holding an optical information recording medium from exerting an adverse effect on the optical information recording medium.

[0002]

2. Description of the Related Art An example of a general configuration of a magneto-optical information recording / reproducing apparatus used as an example of an optical information recording / reproducing apparatus is shown in FIG.
Shown in In this method, an optical information recording medium 1 such as an optical disk is held on a spindle 2 by means such as a magnet, and is rotated by a motor 3. An objective lens 6 mounted on an optical pickup means 5 capable of moving a laser beam emitted from the semiconductor laser 4 in a radial direction of the optical information recording medium 1.
To record information by condensing and irradiating a minute spot on the optical information recording medium with the external magnetic field 7,
The optical pickup means 5 is configured to read information recorded on the optical information recording medium.

[0003] Although the above specific example has exemplified the magneto-optical system,
The present invention is not limited to such a magneto-optical system, but is also applicable to a reproducing system for reading information by reflected light from an optical information recording medium. Generally, in the optical information recording / reproducing apparatus having the above-described configuration, the optical information recording medium receives heat from a motor during rotation of the optical information recording medium through a spindle holding the recording medium. In order to stably operate the information recording / reproducing operation using the optical information recording medium, it is necessary to cope with the characteristic change due to the temperature of the optical information recording medium, that is, the thermal strain due to the temperature distribution difference of the optical information recording medium. There must be.

In particular, when the optical information recording medium is a magneto-optical information recording medium, in particular, in an optical information recording / reproducing apparatus having a so-called simple verify function for monitoring a reproduction signal at the time of recording at the same time as recording to check the recording quality, Device operation is significantly affected by thermal strain,
It is known from our research that information recording and reproduction cannot be performed accurately due to the influence of a change in the structure or molecular structure of the recording medium due to thermal strain.

As a cause of this thermal distortion, it is known that heat generated by the motor is transmitted to the inner peripheral portion of the optical information recording medium via the spindle. However, in the conventional optical information recording / reproducing apparatus, there is no optical information recording / reproducing apparatus incorporating means for avoiding and suppressing heat transfer from the spindle to the optical information recording medium.

JP-A-4-61686 and Japanese Utility Model Laid-Open No. 5
Japanese Patent Application Laid-Open No. 55396/1990 discloses means for providing air wings in an optical recording medium holding portion or related means and air cooling the inside of the apparatus housing by airflow generated as the wings rotate. However, these methods have complicated shapes and have problems such as noise and dust, and there are few examples of practical use. Further, there is no means for avoiding and suppressing heat transfer from the motor to the recording medium via the spindle.

Further, Japanese Utility Model Laid-Open No. 1-159298 discloses that
Means for generating an airflow by using a rotor yoke and an impeller and blowing the airflow onto a magnetic head to cool the magnetic head and remove dust and the like are shown. However, this method is aimed at cooling the magnetic head, and even if this method can be used for cooling the optical information recording medium, it is considered that its practical use is difficult in view of economy because of its complicated structure. Here again, no means has been taken to avoid and prevent heat transfer from the motor to the recording medium via the spindle.

[0008]

That is, in the conventional optical information recording / reproducing apparatus, there is no means for avoiding or suppressing transmission of heat generated by rotation of the spindle motor to the optical information recording medium. There is a problem that it is not possible to sufficiently cope with a change in the characteristics of the optical information recording medium due to thermal strain generated in the recording medium.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem of the prior art by a simple structure, and to prevent heat generated by rotation of a spindle motor from being transmitted to an optical information recording medium via a spindle. An object of the present invention is to provide an optical information recording / reproducing apparatus and an optical information recording / reproducing method capable of performing information recording / reproducing stably by suppressing the information.

[0010]

An optical information recording / reproducing apparatus according to the present invention for solving the above-mentioned problems comprises an optical information recording medium, a spindle for holding the optical information recording medium, a rotating means for rotating the spindle, In an optical information recording / reproducing apparatus comprising: optical pickup means for recording predetermined information on an optical information recording medium or reproducing predetermined information from the optical information recording medium; heat dissipation of the cooling means to suppress the temperature rise of the spindle is provided directly in said cooling means of said spindle
The optical information is formed by a groove-shaped portion provided on the surface.
Air cooling located in an open space in the recording / reproducing device
An optical information recording / reproducing apparatus characterized by being means . The cooling means includes a recess provided in a part of the spindle.
Or a hole or a hole.

According to another aspect of the present invention, there is provided an optical information recording / reproducing method, comprising: an optical information recording medium, a spindle for holding the optical information recording medium, a rotating unit for rotating the spindle, and an optical information recording medium. In the optical information recording / reproducing apparatus configured to record predetermined information or to reproduce predetermined information from the optical information recording medium, a heat radiation type Cooling means is directly provided , and the cooling means is provided for the spindle.
The optical information recording / reproducing is configured by a groove-shaped portion provided on the surface.
An optical information recording / reproducing method characterized by rotating an optical information recording medium while suppressing an increase in the temperature of the spindle by disposing the optical information recording medium in an open space in the apparatus .
The cooling means includes a recess provided in a part of the spindle.
Alternatively, it may be constituted by a hole.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical information recording / reproducing apparatus according to the present invention is characterized in that at least a part of a spindle is provided with a cooling means such as a groove or a hole utilizing an air cooling effect. Thus, heat transfer from the motor to the optical information recording medium via the spindle can be avoided.

As a result, the thermal distortion due to the difference in the temperature distribution of the optical information recording medium is eliminated, and the recording / reproducing operation of the optical information recording / reproducing apparatus can be operated stably.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a specific example of the present invention. FIG.
3 and 4 are views showing a spindle according to the present invention. The optical information recording / reproducing apparatus of the present invention includes an optical information recording medium 1, a spindle 2 for holding the optical information recording medium 1, a rotating unit 3 for rotating the spindle 2, and a predetermined information for the optical information recording medium 1. In the optical information recording / reproducing apparatus comprising the optical pickup means 5 for recording or reproducing predetermined information from the optical information recording medium, the temperature of the spindle 2 rises in a part of the spindle 2 This is characterized in that cooling means 11, 12, 13 for suppressing the above are provided.

FIG. 1 shows an embodiment of the present invention. As shown in detail in FIG. 2, the spindle 2 for holding the optical information recording medium thereon has a plurality of grooves 11 parallel to a plane of rotation of the spindle, that is, a plane perpendicular to the axis of rotation of the spindle. I have. This promotes heat radiation from the spindle rotating at high speed, and avoids or suppresses heat transfer from the motor 3 below it to the optical information recording medium 1 above it. The number of grooves is arbitrary, including one, but is preferably larger. It is preferable that the depth of the groove is deep as long as sufficient strength of the spindle is maintained.

In the present invention, the cooling means is not limited to the above-described structure.
It may be a spiral groove 12 provided in the spindle. Such a configuration also has the same effect as the plurality of grooves 11 parallel to the rotation plane of the spindle. Also in this case, it is preferable that the depth of the groove is deep as long as sufficient strength of the spindle is maintained.

In the present invention, the cooling means may be two parallel holes (through holes) 13 provided in the spindle as shown in FIG. The holes may or may not pass through the axis of rotation of the spindle, and the number and shape of the holes is arbitrary. Other examples of the cooling means include a concave portion provided on a part of the spindle and small fins (wings) or projections protruding from the spindle. In the case of fins, the orientation may be perpendicular, parallel or oblique to the axis of rotation of the spindle, but the fins should not unduly affect the rotation of the spindle and from the standpoint of noise. Is preferably small. The number and shape of the recesses, fins or protrusions are arbitrary.

[0018]

According to the present invention, heat transfer from the spindle motor to the optical information recording medium can be prevented with an easy-to-implement structure in which the spindle is provided with a groove or a hole for cooling. As a result, it is possible to prevent a change in characteristics of the optical information recording medium due to thermal strain, and to achieve an effect of stabilizing the recording / reproducing operation of the optical information recording / reproducing apparatus.

[Brief description of the drawings]

FIG. 1 is a diagram showing a specific example of the present invention.

FIG. 2 is a view showing a specific example of a spindle according to the present invention.

FIG. 3 is a view showing another specific example of the spindle of the present invention.

FIG. 4 is a view showing another specific example of the spindle of the present invention.

FIG. 5 is a diagram showing a schematic configuration of an optical information recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical information recording medium 2 ... Spindle 3 ... Motor 4 ... Semiconductor laser oscillator 5 ... Optical pickup means 6 ... Objective lens 7 ... External magnetic field 8 ... Housing 11 ... groove 12 ... spiral groove 13 ... hole

Claims (13)

(57) [Claims] 1. An optical information recording medium, a spindle for holding the optical information recording medium, a rotating means for rotating the spindle, and recording predetermined information on or from the optical information recording medium. In an optical information recording / reproducing apparatus constituted by an optical pickup means for reproducing predetermined information, a radiation type cooling means for suppressing a temperature rise of the spindle is directly provided on a part of the spindle ,
The cooling means includes a groove provided on the surface of the spindle.
In the optical information recording / reproducing apparatus.
An optical information recording / reproducing apparatus characterized by air cooling means arranged in an open space . 2. The optical information recording / reproducing apparatus according to claim 1, wherein said optical information recording medium is an optical disk. Wherein the groove portion is an optical information recording according to claim 1, wherein in that it is composed of a plurality of grooves that are disposed in parallel to each other in a direction perpendicular to the axis of rotation of the spindle Playback device. Wherein the groove portion, the optical information recording and reproducing apparatus according to claim 1 or 2 wherein, characterized in that it consists of a spiral groove provided on the surface of the spindle. 5. An optical information recording medium, comprising:
Spindle to hold, rotation to rotate the spindle
Means for recording predetermined information on the optical information recording medium.
Or for reproducing predetermined information from the optical information recording medium.
Optical information recording / reproducing device comprising optical pickup means
The temperature of the spindle is
The heat radiation type cooling means for suppressing the temperature rise
The cooling means is constituted by a concave or a hole,
Located in an open space inside the optical recording / reproducing device
Optical information recording / reproducing device,
Place. 6. An optical information recording / reproducing apparatus according to claim 2, wherein said optical information recording medium is a magneto-optical information recording medium. 7. An optical information recording medium, a spindle for holding the optical information recording medium, a rotating means for rotating the spindle, and recording predetermined information on or from the optical information recording medium. In an optical information recording / reproducing apparatus constituted by an optical pickup means for reproducing predetermined information, a radiation type cooling means is directly provided on a part of the spindle, and the cooling means is provided on a surface of the spindle.
The optical information recording / reproducing device is constituted by the provided groove-shaped portions.
An optical information recording / reproducing method, wherein the optical information recording medium is rotated while suppressing an increase in the temperature of the spindle by disposing the optical information recording medium in an open space . 8. The optical information recording / reproducing method according to claim 7 , wherein said optical information recording medium is an optical disk. 9. The optical information recording / reproducing method according to claim 7, wherein said cooling means is an air cooling means. 10. The optical information recording / reproducing method according to claim 9 , wherein said groove portion is constituted by a plurality of grooves provided in parallel to each other in a direction perpendicular to the rotation axis of said spindle. . 11. The optical information recording / reproducing method according to claim 9 , wherein said groove portion is formed by a spiral groove portion provided on a surface of said spindle. 12. An optical information recording medium, said optical information recording medium
Holding the spindle, the time to rotate the spindle
Means for recording predetermined information on the optical information recording medium
Or to reproduce predetermined information from the optical information recording medium.
Information recording / reproducing comprising optical pickup means
In the device, a part of the spindle is used as a cooling
A step is provided directly, and the cooling means is constituted by a recess or a hole.
And place it in an open space in the optical information recording / reproducing device.
Position to prevent the temperature of the spindle from rising.
Characterized by rotating an optical information recording medium while rotating
Information recording and playback method. 13. The optical information recording / reproducing method according to claim 12 , wherein said optical information recording medium is a magneto-optical information recording medium.