JP2630212B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device,
In particular, the present invention relates to a thin optical disk device having a rising mirror in an optical system of an optical head.

[0002]

2. Description of the Related Art Conventionally, in an optical disk device of this type, as shown in FIG. 5, a laser beam 14 emitted from an optical module 10 is raised by 90.degree. Irradiated on an optical disk medium (not shown).

[0003] Here, the optical module 10 and the rising mirror 11 are fixed to the opt base 9 in association with each other, and the objective lens 13 is driven and controlled by the actuator 12 in the track direction and the focus direction.

The optical module 10 and the actuator 12 are protected by the actuator cover 4 from being damaged by dust and careless handling. The actuator cover 4 includes a rising mirror 11 and an objective lens 13.
There is provided a hole 4a for passing a laser beam 14 from the optical module 10 for irradiating the optical disk medium through the hole 4a. The diameter of the hole 4a is larger than the diameter of the objective lens 13.

The optical module 10 comprises a laser element 10a and a three-beam diffraction grating 10b, as shown in FIG.
, A hologram element 10c, and a photodetector 10d. In the optical module 10, a track and focus error detecting means are integrated.

[0006]

Generally, an optical disk device capable of recording and reproducing data is often used by being incorporated in a computer device. However, since a fan is used for cooling in a computer device, a failure often occurs in a device built in the device due to intrusion of dust or dust.

In the case of an optical disk device built in a computer device, dust that has entered inside adheres to an objective lens or a rising mirror of an optical head, deteriorating the level of a signal to be recorded or reproduced, and finally becomes inoperable. May be in a state.

Conventionally, this type of optical disc apparatus is equipped with a cleaner for automatically cleaning dust adhering to an objective lens in order to prevent a failure caused by dust entering inside the apparatus, or when an apparatus malfunctions. We take measures such as cleaning manually. However, if dust adheres to the rising mirror portion, the optical head itself must be replaced, and this replacement of the optical head requires cost and time.

Therefore, an object of the present invention is to solve the above-mentioned problems, to protect the rising mirror from dust entering the apparatus, to prevent deterioration in the level of a signal to be recorded and reproduced, and Another object of the present invention is to provide an optical disk device capable of improving the reliability of the device.

[0010]

Optical disc apparatus according to the present invention SUMMARY OF THE INVENTION comprises a laser device, the laser beam emitted from the laser device in a direction perpendicular to the optical axis of the laser beam
And rising up mirror that reflects, distribution on top of said power-up mirror
The laser light provided and reflected by the rising mirror
An objective lens for condensing light on an optical disk medium;
A lower mirror and the riser up mirror and the riser up Mi <br/> has an open portion irradiating direction of the laser light reflected is opened in error and the laser element between said objective lens An optical disc device including a fixed base for fixing the fixed base in association with each other, wherein a shielding plate for shielding an open portion of the fixed base,
A guide member for guiding the shield plate to open the open portion when reading / writing to / from the optical disk medium and guiding the shield plate to shield the open portion when reading / writing to / from the optical disk medium is completed.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention.
FIG. 2 is a sectional view of one embodiment of the present invention, and FIG. 3 is a perspective view of one embodiment of the present invention. In these figures, an optical head 1 is guided by a main guide shaft 6 and a sub guide shaft 7 fixed to a mechanical chassis (not shown), and is driven by a drive source (such as a linear motor) (not shown) to form an optical disk medium 8. Move in the radial direction.

The optical head 1 has a function of recording information or reading information while accessing the optical disk medium 8 at high speed when the optical disk medium 8 moves in the radial direction.

[0014] The optical head 1 and the optical module 10 and rising up mirror 11 mounted on the opto-base 9, and a on-board objective lens 13. the actuator 12.

[0015] In the optical head 1, an optical module 10, rising up mirror 11, the objective lens 13 is the upper opto cover 2 and opto cover 3 and the actuator cover 4
And is covered by.

The upper opt cover 2 is placed so as to slide on the upper surface 3a of the opt cover 3.
When the optical head 1 performs reading and writing on the optical disk medium 8, the optical head 1 is urged by the return spring 15 toward the optical module 10. Therefore, the rear end 2 b of the upper opt cover 2 is brought into contact with the rising portion of the opt cover 3 by the return spring 15.

On the other hand, when the optical head 1 returns to the home position after finishing reading / writing to / from the optical disk medium 8, the upper opto cover 2 is returned because the lever 2a is guided along the inclined portion of the guide 5. It moves toward the rising mirror 11 against the urging force of the spring 15.

That is, when the optical head 1 moves in the direction of the arrow A, the lever 2a moves in the direction of the arrow B when the optical head 1 moves in the direction of the arrow A.
1. Cover the opening above.

The opt cover 3 covers the upper and side surfaces of the optical path of the laser beam 14 from the optical module 10 to the rising mirror 11 along the opt base 9. The actuator cover 4 covers the entire actuator 12 that drives the objective lens 19 in the track direction and the focus direction.

The operation of the embodiment of the present invention will be described with reference to FIGS. In addition, the optical module 10
It has the same configuration as the conventional example shown in FIG.

When reproducing information from the optical disk medium 8, the laser beam 14 from the laser element 10a of the optical module 10 is applied to a three-beam diffraction grating 10b for detecting a track error.
Through the mirror and enters the rising mirror 11.

The laser beam 14 is 90 ° at the rising mirror 11.
The reflected light is emitted to the objective lens 13 and the objective lens 13
The light is focused on the information pits of the optical disk medium 8 through the optical disk. The return light from the optical disk medium 8 including the information of the information pits enters the optical module 10 through the objective lens 13 and the rising mirror 11.

In the optical module 10, this return light is diffracted by the hologram element 10c as a focus error detection and information signal detection means, and is condensed at a predetermined position on the photodetector 10d. The optical head 1 outputs signal information, track error information, and focus error information by the above operation.

When reproducing information from the optical disk medium 8 described above, the optical head 1 moves in the radial direction of the optical disk medium 8. As the optical head 1 moves, the upper opto cover 2 is urged toward the optical module 10 by the return spring 15 to secure the optical path of the laser beam 14 from the optical module 10, and the rear of the upper opto cover 2. end 2b abuts against the rising-up part of the opto-cover 3.

On the other hand, the optical disk medium 8 by the optical head 1
When the reproduction of the information from is completed, the optical head 1 moves in the direction of arrow A and returns to the home position. At this time, the lever 2 a of the upper cover 2 is guided along the inclined portion of the guide 5, and moves the upper cover 2 toward the rising mirror 11 against the urging force of the return spring 15. Optical head 1
Moves in the direction of arrow A and completely returns to the home position.
Is covered.

The actuator cover 4 has an objective lens 13
The objective lens 1 to pass the laser light 14
A hole 4 a slightly larger than the outer diameter of the lens 3 is provided, and dust entering from the hole 4 a adheres to the upper surface of the objective lens 13.

The dust passes through the space between the actuator 12 and the actuator cover 4 and passes through the upper opto cover 2.
Although it falls on the top, it does not reach the rising mirror 11.
Dust on the objective lens 13 is removed by the lens cleaner at the home position at the start of operation of the apparatus. Dust that falls on the rising mirror 11 due to this removal work also falls on the upper opto cover 2. 1
It does not reach 1.

Therefore, when the optical head 1 is not operated, dust entering through the hole 4a of the actuator cover 4 at the home position and dust falling during the removal of the lens cleaner from the objective lens 13 are blocked by the upper opto cover 2. Does not adhere to the rising mirror 11.
Thereafter, the optical head 1 moves to the innermost circumference of the optical disk medium 8 and starts a predetermined operation.

The above operation is an operation of reproducing information from the optical disk medium 8, and the operation of recording information on the optical disk medium 8 is performed in the same manner as the reproduction operation. Although the optical system using the optical module 10 has been described, the same effect can be obtained when the laser element 10a, the photodetector 10d, and the error detecting means are fixedly arranged on the opt base 9.

[0030] Thus, when the optical head 1 has come to the home position at the time of recording and reproducing operation end information on the optical disc medium 8 by the optical head 1, rising up mirror 11 above the opening by the upper opto cover 2 , It is possible to protect the rising mirror 11 from dust entering the apparatus.

Accordingly, it is possible to prevent the level of the signal to be recorded and reproduced from deteriorating due to the decrease in the optical reflectance of the rising mirror 11 due to dust, and to greatly improve the reliability of the apparatus.

[0032]

According to the present invention as described above, according to the present invention, the open portion a shielding plate for shielding the fixing base opening portion for fixing in association with rising up mirror and the laser device, when the read and write with respect to the optical disk medium And the guide member is guided by the guide member so as to cover the open portion at the end of reading / writing to / from the optical disk medium, thereby protecting the rising mirror from dust invading the device and reducing the level of the signal to be recorded and reproduced. There is an effect that deterioration can be prevented and the reliability of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the present invention.

FIG. 3 is a perspective view of one embodiment of the present invention.

FIG. 4 is a perspective view illustrating a configuration example of an optical module.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical head 2 Upper opt cover 2a Lever 3 Opt cover 4 Actuator cover 5 Guide 8 Optical disk medium 9 Opt base 10 Optical module 11 Rising mirror 12 Actuator 13 Objective lens

Claims (2)

(57) [Claims] 1. A laser device, and a laser beam emitted from the laser device is orthogonal to an optical axis of the laser beam.
And rising up mirror reflecting direction, on the start-up mirror
The laser disposed in the section and reflected by the rising mirror
An objective lens that focuses laser light on the optical disc medium,
Serial start-up mirror and the has an open portion irradiating direction of the laser beam reflected by the riser <br/> top up mirror is opened between the objective lens and the riser up to the laser element < An optical disc device, comprising: a fixed base for fixing the base in association with a mirror, wherein a shielding plate for blocking an open part of the fixed base, and the open part is opened when reading from or writing to the optical disk medium. A guide member for guiding the shield plate and guiding the shield plate so as to shield the open portion when reading / writing to the optical disk medium is completed. Wherein said saw including a biasing member for urging the shielding plate in the opening direction of the opening portion, wherein the guide member is the light disc
At the end of reading and writing to the storage medium,
The shielding plate to shield the open portion against the power
2. The optical disk device according to claim 1, wherein the guidance is provided.