JPH05258334A - Device for driving optical information recording medium - Google Patents

Abstract

PURPOSE:To suppress influence imparted to a constitution member by temperature rise in a semiconductor laser part with simple constitution. CONSTITUTION:One end of an elastic member 15 with better heat conductivity than the housing 7 of an optical head 6 containing a semiconductor laser driving part 4 is fixed to the base part 13 of a driving device body being a radiator part. Further, the other end of the elastic member 15 is brought into contact with a semiconductor laser 5 part and heat generated in the semiconductor laser 5 part is not transferred to the housing 7 but transferred to the base part 13 through the elastic member 15. Thus, the semiconductor 5 and the optical component in the housing 7 are prevented from adverse effect due to temperature rise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium driving device for performing recording / reproducing on an optical information recording medium such as an optical disk or a magneto-optical disk.

[0002]

2. Description of the Related Art In a conventional optical disk drive device, generally, when recording information, a semiconductor laser is generated so as to have an optical power of several times during reproduction. Therefore, it has been a cause of raising the temperature of the semiconductor laser driving section.

[0003]

In the above-mentioned prior art, when the temperature of the semiconductor laser drive section exceeds a predetermined temperature, the wavelength of the laser light is changed, and heat is transferred to the entire housing constituting the optical head. There is a problem in that the optical components are displaced.

It is an object of the present invention to provide an optical information recording medium driving device capable of suppressing the influence of temperature rise in the semiconductor laser portion on the constituent members with a simple structure.

[0005]

In order to achieve the above object, the present invention provides an optical head including a semiconductor laser driving section,
In an optical information recording medium driving device that moves a disc-shaped optical information recording medium in the radial direction, one end of an elastic member made of a material having better thermal conductivity than the housing of the optical head is fixed to a heat radiation part of the driving device main body. The other end is brought into contact with the semiconductor laser portion.

When the optical head is moved at high speed,
Retraction means for retracting the elastic member to a position where it does not contact the semiconductor laser portion is provided.

Further, the retracting means is provided in the locking means for fixing the movement of the optical head, and the elastic member can be retracted when the locking means is moved to the fixing release side with respect to the optical head.

[0008]

According to the above means, the heat generated in the semiconductor laser portion is transferred to the heat radiating portion through the elastic member having better thermal conductivity than the housing of the optical head. Can suppress the temperature rise.

Further, when the seek movement is performed in which the optical power of the laser light is lowered to move the optical head at a high speed, the elastic member is moved away from the semiconductor laser portion by the retracting means. Not a load.

Further, by providing the retracting means in the locking means, the driving means such as a motor in both means can be made common and the driving mechanism can be simplified.

[0011]

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

FIG. 1 is a plan view showing a schematic structure of an embodiment of the present invention. Reference numeral 1 is an optical pickup section including an objective lens 2 and an objective lens actuator 3, and 4 is fixed to a side portion of the optical pickup section 1. In the semiconductor laser drive unit for causing the semiconductor laser 5 to emit light, the optical pickup unit 1 and the semiconductor laser drive unit 4 form an optical head 6.

Reference numeral 7 denotes a housing for supporting each member of the optical pickup unit 1, and a seek motor coil 8 including a seek motor coil 8, a magnet 10 and a yoke 11 is installed on both sides of the housing. The seek motor 12 is fixed to the base portion 13 of the apparatus body with screws.

Reference numeral 15 is a plate-like elastic member made of a material having a higher thermal conductivity than that of the housing 7, and fixed to the base 13 so as to come into contact with the semiconductor laser 5 portion as described later.

In the figure, the optical head 6 is a radial direction (arrow x) of an optical disk (not shown) which rotates about a point O.
Direction) by the seek motor 12 and the laser light emitted from the semiconductor laser 5 which is a light emission source is moved to the objective lens 2.
Then, the information is optically recorded and reproduced while performing tracking control and focusing control as is well known by narrowing down and irradiating the optical disc as a light spot.

FIG. 2 is a perspective view showing the members around the elastic member 15. One end 15a of the elastic member 15 is the semiconductor laser 5.
The other end 15b is a free end that can move up and down so as to come into contact with and separate from the portion, and the other end 15b is screwed to a base portion 13 which is a heat radiating portion of the apparatus body. Locking means 20 for fixing the movement of the optical head 6 is installed on the base portion 13 below the elastic member 15.

The lock means 20 includes a lock motor 21 and
Worm gear 22 fixed to the output shaft of lock motor 21
A rack 23 that meshes with the worm gear 22, a lock plate 24 fixed to the rack 23, and an operating shaft 25 that is a retreating means that is erected on the lock plate 24 and is in contact with the inclined portion 15c of the elastic member 15. A guide for guiding the movement of the lock plate 24, which is formed on a side portion of the lock plate 24 and has a concave-convex portion 27 that fits with the locking projection 26 of the housing 7 of the optical head 6, a groove 28 and a pin 29. And means 30.

In the figure, the lock motor 21 is turned on when the optical head 6 needs to be fixed when the optical disk is ejected from the main body of the apparatus. Then, the worm gear 22 is normally rotated, and the rack 23 is locked by the locking projection 26 of the housing 7.
Move in the direction. The lock plate 24 is also moved by the movement of the rack 23, so that the locking projection 26 and the concave-convex portion 27 are fitted to each other, and the optical head 6 is held stationary.

3 (a) to 3 (c) are explanatory views of the contact / separation operation of the elastic member 15 with respect to the semiconductor laser 5 portion, and FIG.
Is a state in which the locking projection 26 of the housing 7 and the concave-convex portion 27 of the lock plate 24 are fitted to each other to make the optical head 6 immovable, as described above, and the operating shaft 25 is an elastic member.
Not contacting the inclined portion 15c of 15. Therefore, the elastic member 15
One end 15a of the is elastically contacted with the semiconductor laser 5 portion.

FIG. 3B shows a state during normal operation, in which the lock motor 21 is rotated in the reverse direction so that the lock plate 24 is moved away from the optical head 6, and the locking projection 26 and the uneven portion 27 are provided.
The optical head 6 can be moved by releasing the fitting of the optical head 6. In this state, the operating shaft 25 and the inclined portion 15c of the elastic member 15 are not in contact with each other.

Therefore, the elastic member 15 is formed of a material such as silver or copper, which has a higher thermal conductivity than the material of the housing 7 of the optical pickup section 1 such as aluminum or aluminum alloy, and alloys thereof, and Optical pickup unit 1
If the elastic member 15 is brought into contact with the semiconductor laser 5 part by the same area as the contact area between the semiconductor laser driving part 4 and the semiconductor laser driving part 4, the heat generated in the semiconductor laser 5 part through the elastic member 15 is the base part 13 which is the heat dissipation part. Transmitted to the housing 7 and semiconductor laser 5
It is possible to suppress the temperature rise in the above, and it is possible to prevent the positional deviation and the characteristic deterioration of an optical component (not shown).

FIG. 3C shows a state at the time of seek movement,
In this state, the power of the laser light is lowered and the optical head 6
Need to move at high speed. In this case, the lock plate 24 is further moved in the direction away from the optical head 6 by the reverse rotation of the lock motor 21, the operating shaft 25 contacts the inclined portion 15c of the elastic member 15, and the elastic member 15 has one end 15a at the semiconductor laser 5 portion. Move to a retracted position away from.

Therefore, since the elastic member 15 and the semiconductor laser 5 portion do not come into contact with each other when the seek movement of the optical head 6 occurs, the elastic member 15 does not become a load when moving. Incidentally, FIG.
In the normal operation of (b), the contact between the elastic member 15 and the semiconductor laser 5 portion causes a frictional load with respect to the movement of the optical head 6, but the contact pressure (load) is several grams or less, and the optical head follows The movement is not adversely affected by setting it within the allowable range of the characteristics.

[0024]

As described above, according to the present invention,
Since the heat generated in the semiconductor laser portion can be released to the heat radiation portion by the elastic member, it is possible to suppress the temperature rise of the semiconductor laser and the housing of the optical head, and it is possible to prevent the positional deviation of the components and the characteristic deterioration of the semiconductor laser, Further, when the optical head moves at high speed, the elastic member and the semiconductor laser portion are retracted so as not to come into contact with each other, so that smooth high-speed movement is possible, and the elastic member can be retracted by a part of the locking means for fixing the movement of the optical head. Therefore, the means for evacuating can be provided with a simple structure, so that it is possible to provide an optical information recording medium drive device capable of suppressing the influence of temperature rise in the semiconductor laser portion on the constituent members with a simple structure.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of an embodiment of an optical information recording medium driving device of the present invention.

FIG. 2 is a perspective view showing members around an elastic member.

FIG. 3 is an explanatory diagram of a contacting / separating operation of an elastic member with respect to a semiconductor laser portion.

[Explanation of symbols]

1 ... Optical pickup unit, 4 ... Semiconductor laser drive unit,
5 ... Semiconductor laser, 6 ... Optical head, 7 ... Housing, 13 ... Base (heat dissipation part), 15 ... Elastic member, 20 ... Locking means, 24 ... Lock plate, 25 ... Working shaft
(Evacuation means).

Claims (3)

[Claims] 1. An optical head including a semiconductor laser drive section,
In an optical information recording medium driving device that moves a disc-shaped optical information recording medium in the radial direction, one end of an elastic member made of a material having better thermal conductivity than the housing of the optical head is fixed to a heat radiating portion of the driving device main body. The optical information recording medium driving device is characterized in that the other end is brought into contact with the semiconductor laser portion. 2. A retracting means for retracting the elastic member to a position where it does not contact the semiconductor laser portion when the optical head is moved at a high speed is provided.
Optical information recording medium driving device. 3. The lock means for fixing the movement of the optical head is provided with the retracting means, and the elastic member can be retracted when the lock means is moved toward the fixing release side with respect to the optical head. Optical information recording medium driving device.