JPH08147740A - Dust removing device for optical disk device - Google Patents

Abstract

PURPOSE: To easily remove dust stuck to an objective lens during the operation of an optical disk without damaging the objective lens by providing an air blowing means on an optical block. CONSTITUTION: An optical block 4 comprises a chassis 8, a cover 9, an objective lens 5 and an air blowing means 10. When the optical block 4 is moved along plural guide shafts 11 in the direction of the arrow X1, air is made to flow in from a first opening 16 of the air blowing means 10, converged into an air path 14 and is blown against the objective lens 5 from a second opening 18 as high-speed air flow or air flux AB. Thus, dust 20 stuck to the objective lens 5 is blown off and removed. Consequently, since the high-speed air flow AB removes dust 20 stuck to the objective lens 5 every time when the optical block 4 is moved in the direction of the arrow X1, the removal of dust on the objective lens 5 is much efficiently performed at the time of using an optical disk device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing device provided for an optical disk device used for reproducing information recorded on an optical disk and recording information on the optical disk.

[0002]

2. Description of the Related Art An optical disc device used for reproducing an optical disc, for example, a compact disc (CD), has an optical pickup. This optical pickup can be moved by guide means arranged along the radial direction of the optical disc. The optical pickup has an objective lens for focusing light on the optical disc.

[0003]

In this type of optical disk device, dust adheres to the above-mentioned objective lens. In this way, the dust adheres to the surface of the objective lens because the dust rises when the optical disc rotates,
This is because it adheres to the objective lens facing the optical disc. When dust adheres to the objective lens in this way, the following problems occur. If dust adheres to the objective lens, when the light from the light source such as a laser diode is focused on the optical disk, the laser light is blocked by the dust and the light amount decreases, or the return light from the optical disk. When the light is received through the objective lens, the amount of returning light is reduced, that is, the signal of recorded information is reduced. Therefore, conventionally, when dust adheres to the objective lens, the following measures are taken to remove the dust from the objective lens. (1) A service person disassembles the optical disk device and cleans the objective lens. (2) A separate component such as a brush is provided in advance in the optical disk device, and the dust attached to the objective lens is cleaned by this separate component.

However, the cleaning of the objective lens by the former method cannot be performed by a general user, and a specialized service person must disassemble it, which is expensive and time consuming. In the latter method, another component such as a brush and the objective lens frequently come into contact with each other, which may damage the objective lens. As described above, in the optical disk device, unless the dust attached to the objective lens is removed, a signal read / write error occurs due to a shortage of the amount of light focused on the optical disk.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and scratches the target object with dust adhering to the target object such as an objective lens from which dust is to be removed during operation of the optical disk. It is an object of the present invention to provide a dust removing device for an optical disk device that can be easily removed without using the device.

[0006]

According to the present invention, the above-mentioned object is to provide a drive means for rotating an optical disc, a guide means arranged along the radial direction of the optical disc, and recording on the optical disc. An optical moving body having an objective lens for condensing light onto the optical disc for reproducing information or recording information on the optical disc, and movable along the guide means. An air blowing unit provided on the moving body, for blowing air to a dust removal target portion of the optical moving body that is going to remove dust when the optical moving body moves along the guide means. Is achieved by the dust removing device of the optical disk device including the. In the present invention, preferably, the air blowing unit has a first opening for taking in air and a second opening for squeezing the taken-in air to give it to the dust removal target site. In the present invention, the dust removal target portion is preferably the objective lens. In the present invention, preferably, the dust removal target site is the guide unit. In the present invention,
Preferably, the guide means is a plurality of rod-shaped bodies.

[0007]

According to the above construction, the driving means rotates the optical disk, and the optical moving body moves along the radial direction of the optical disk by the guide means to reproduce information recorded on the optical disk or to the optical disk. Record the information.
At this time, the air blowing unit blows air to the dust removal target portion of the optical moving body that is going to remove dust. This allows the dust adhering to the dust removal target site such as the objective lens to be easily removed in a non-contact manner without damaging the target site during operation of the optical disc. The air blowing means has a first opening for taking in air and a second opening for giving the taken-in air to the dust removal target portion, and the air is taken in through the first opening to squeeze the air to obtain the second air. It is applied to the dust removal target through the opening.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

Embodiment 1 FIG. 1 shows the entire optical disk device of the present invention.
This optical disc device is an optical disc device for reproducing information recorded on, for example, a compact disc (CD). The main body 1 is provided with a motor 2 as driving means. The motor 2 is a driving means for rotating the optical disc D. An optical block 4 is arranged in the recess 3 of the main body 1 so as to be movable in the direction of arrow X. The optical block 4 has an objective lens 5 for focusing light on the optical disc D in order to reproduce the information recorded on the optical disc D, for example. Light source 6
Are arranged inside the main body 1. The light source 6 has, for example, a laser diode 7 and its associated circuitry.

The optical block 4 is shown enlarged in FIG. The optical block 4 has a chassis 8, a cover 9, the above-mentioned objective lens 5 and air blowing means 10. The objective lens 5 is arranged at the upper center of the cover 9 in a substantially central position. The cover 9 is arranged on the chassis 8 as shown in FIGS. 2 and 3. The chassis 8 is shown in FIG.
1 is equipped with an optical component for guiding the laser light from the laser diode 7 of the light source 6 to the objective lens 5 side, and an electrical and mechanical component for processing a reproduction signal based on the return light from the optical disc D of FIG. ing.

For example, the light L from the laser diode 7 shown in FIG. 6 is bent along the guide axis 11 by the optical component in the chassis 8 and is condensed by the objective lens 5 on the information recording surface of the optical disc D. Has become. Then, the light beam L reflected by the optical disk D is separated from the light beam emitted from the laser diode 7 and guided to the photodetector. The laser light L emitted from the laser diode 7 follows the displacement of the optical disc D in the direction orthogonal to the surface direction of the optical disc D caused by the warp of the optical disc D or the like, and is combined on the information recording surface of the optical disc. The position of the objective lens in the optical axis direction is adjusted in the focus direction so as to be focused. At the same time, the optical axis of the objective lens 5 is adjusted so that the spot position of the laser light L emitted from the laser diode 7 on the optical disc D follows the eccentricity of the optical disc D and the meandering of the track formed on the optical disc D at the same time. The position in the direction orthogonal to is adjusted in the tracking direction.

As described above, the focus position of the light beam emitted from the laser diode 7 and the spot position on the information recording surface of the optical disc are adjusted in the optical axis direction of the objective lens 5 and in the direction orthogonal to the optical axis. It is done by adjusting the position, but to adjust the position of the objective lens,
A battery-driven actuator, that is, a biaxial actuator or an objective lens actuator is used.
The cover 9 is for covering the chassis 8 described above, and is a cover for protecting the optical components, electrical components, and mechanical components in the chassis 8 described above from dust and impact.

As shown in FIGS. 1 and 2, the two guide shafts 11 and 11 are arranged in parallel with each other in the arrow X direction at the same interval. The guide shafts 11, 11 are preferably solid shafts having a circular cross section, and are supported by bearings (not shown) of the chassis 8. Accordingly, the optical block 4 can be moved in the arrow X direction by the motor provided on the chassis 8.

Air blowing means 10 is provided on the cover 9. The air blowing means 10 has a wedge shape when viewed from the side as shown in FIG. 4, and a rectangular shape when viewed from the top as shown in FIG. The air blowing unit 10 has an air passage 14 for throttling the inflowing air into a high-speed airflow. This air passage 14
Is indicated by a broken line in FIGS. 2, 4 and 5,
The large inlet is the first opening 16 and the smaller outlet is the second opening 18.

The first opening 16 is an air intake, and the second opening 18 is an air outlet. For example, as shown in FIG. 2, when the optical block 4 moves on the guide shaft 11 along the direction of the arrow X1, the first opening 16 is opened.
The air A flows into the air passage 14, is squeezed in the air passage 14, and is blown to the objective lens 5 from the second opening 18 as a high-speed air flow or air bundle AB. In this way, the air blowing unit 10 is arranged corresponding to the objective lens 5, and particularly the second opening 18 is provided.
Are arranged corresponding to the objective lens 5. In this way, the high-speed air flow AB is formed by the air blowing unit 10 and is blown to the objective lens 5 side, so that the dust 2 adhered to the objective lens 5 which is a dust removal target portion.
0 can be easily blown off without contact.

Next, the operation of the first embodiment shown in FIGS. 1 to 5 will be described. In FIG. 1, the spindle motor 2 is operated to rotate the optical disc D. And the optical block 4
The optical block 4 moves on the guide shafts 11 and 11 in the direction of the arrow X1 by driving the motor. That is, the optical block 4 irradiates the information recording surface of the optical disc D with the laser light L of the laser diode 7 via the objective lens 5 while moving from the inner peripheral side to the outer peripheral side of the optical disc D. The return light from the information recording surface of the optical disc D is
The optical disc D is received by the light receiving portion of the chassis 8.
You can read the recorded signals of.

When the optical block 4 moves along the guide shafts 11 and 11 in the direction of arrow X1, as shown in FIG. 2, air A flows in through the first opening 16 of the air blowing means 4. , The second opening 18 that is squeezed in the air passage 14
Is blown onto the objective lens 5 as a high-speed air flow or air bundle AB. As a result, the dust 20 attached to the objective lens 5 can be blown away and removed as shown in FIG. That is, in Example 1 of FIG. 2, the high-speed airflow AB removes the dust 20 adhering to the objective lens 5 every time the optical block 4 is moved in the direction of the arrow X1. The dust on the objective lens 5 can be most efficiently removed during use.

Second Embodiment FIG. 7 shows a second preferred embodiment of the dust removing device of the optical disk device of the present invention. In the second embodiment shown in FIG. 7, as in the first embodiment shown in FIG. 2, it is possible to move in the direction of the arrow X along the guide shaft 11. The optical block 104 is
It has a chassis 108, a cover 109, an air blowing unit 110, an objective lens 105 and the like. In Example 2 of FIG. 7, the objective lens 105 is arranged at a relatively end of the cover 109. The air blowing unit 110 is arranged on the cover 109 near the objective lens 105. The air blowing means 110 has a first opening 116 and a second opening 118. The first opening 116 is an opening for taking in the air A, and the second opening 118 is an opening for blowing the air flow A narrowed in the air passage 114 to the objective lens 105 side as a high-speed air flow or air bundle AB. Is. Move the optical block 104 to the arrow X
When moving in the direction of 1, the high-speed airflow AB from the second opening 118 can blow away the dust 20 adhering to the objective lens 105 and remove it.

Embodiment 3 FIG. 8 shows a preferred embodiment 3 of the dust removing device of the optical disk device of the present invention. In the third embodiment of FIG. 8, the optical block 204 includes the chassis 208, the cover 209,
It has two air blowing means 210, 210 and an objective lens 205. The third embodiment shown in FIG. 8 differs from the first embodiment shown in FIG. 2 and the second embodiment shown in FIG. 7 in that two air blowing means 210, 210 are arranged on the cover 209. These two air blowing means 210, 2
10 is a first opening 216 and a second opening 218, respectively.
have.

When the optical block 204 moves along the direction of the arrow X1 on the guide shaft 11, the air A enters the first opening 216 of the one air blowing unit 210, and the air flows in the internal air passage 214. Squeezed, second opening 218
A high-speed air flow AB is blown from. As a result, the dust adhering to the objective lens 205 can be removed by blowing it away. On the other hand, the optical block 204
When A moves on the guide shafts 11 and 11 along the direction of the arrow X2, the air A enters the first opening 216 of the other air blowing unit 210. This air flow A is the air passage 21.
4 and is blown onto the objective lens 205 from the second opening 218 as a high-speed air flow AB. Thus, the dust adhering to the objective lens 205 can be removed by blowing it away.

As described above, in the third embodiment shown in FIG. 8, even when the optical block 204 moves in the arrow X1 direction (direction from the inner circumference to the outer circumference of the optical disc D in FIG. 1),
The dust adhering to the objective lens 205 can be removed. Moreover, even when the optical block 204 moves in the direction of the arrow X2 (the direction from the outer circumference to the inner circumference of the optical disc D), the dust adhering to the objective lens 205 can be similarly removed.

Fourth Embodiment FIG. 9 shows a fourth preferred embodiment of the dust removing device of the optical disk device of the present invention. Example 4 of FIG.
The structure is almost the same as that of the third embodiment. However, the fourth embodiment of FIG. 9 is different in the following points. One air blowing means 2
The ten air passages 214 are connected to the extended air passages 300. The extended air passage 300 includes the guide shafts 11 and 11.
It reaches the vicinity and is connected to the third opening 307 of the chassis 208. The air blowing means 210 is
First opening 216 and second opening 218 and air passage 2
Have fourteen. Another air blowing means 210
Has a first opening 216, a second opening 218 and an air passage 214.

As a result, the optical block 304 is moved to the arrow X.
When moving in one direction, the air A enters through the first opening 216, is narrowed down by the air passage 214, and is blown onto the objective lens 205 as a higher-speed air flow AB than the second opening 218. This allows the dust adhering to the objective lens 205 to be blown off and removed. At the same time, the air A is squeezed by the air passage 214 and the extension passage 30
The high velocity airflow AC exits through the third opening 307 through 0. With this high-speed airflow AC, the guide shaft 1
Dust adhering to 1 and 11 is blown off and blown out of the optical block 304 through the third opening 307.

Embodiment 5 FIG. 10 shows a preferred embodiment 5 of the dust removing device of the optical disk device of the present invention. Optical block 404
Has the same configuration as that of the optical block 4 shown in FIG. However, in this embodiment, the guide shaft 411 is arranged in the arrow X direction on both sides of the chassis 8 unlike the guide shaft of FIG. The optical block 404 can be moved in the direction of arrow X with respect to the guide shafts 411 and 411 via the support moving means 500. That is, the support moving means 500 is
For example, the optical block 404 has two rollers 501 and preferably sandwiches the guide shaft 411.
I support.

The air blowing means 10 has a first opening 16
And a second opening 18 and an air passage 14. The air A flowing into the first opening 16 is narrowed by the air passage 14 and is blown to the objective lens 5 as an air flow AB having a higher speed than that of the second opening 18.
Thus, the dust attached to the objective lens 5 can be removed by blowing it away. At the same time, the air A enters through the first opening 16 and is throttled in the air passage 14, and then is blown as an air flow AC having a higher speed than the third opening 530 on the side of the instruction moving means 500 through the extension passage 520. It is designed to be attached. As a result, the dust adhering to the guide shaft 411 and the roller 50 of the support moving means 500 are
The dust adhering to 1 can be blown off and removed.

In the above-described embodiment, the optical block is moved from the inner circumference to the outer circumference of the optical disc D during use of the optical disc device, that is, in order to move the optical block to reproduce the signal of the optical disc. The dust adhered to the objective lens can be removed by blowing it off by generating a high-speed air flow. Since the dust is removed using a high-speed air flow, there is no contact, and there is no risk of scratches on the objective lens. The dust removing device of the present invention is most likely to adhere to dust when using the optical disc device, but since dust can be effectively removed when using the optical disc device, the dust removing device Very efficient.

In Example 3 of FIG. 8 and Example 4 of FIG. 9, when moving from the inner circumference to the outer circumference of the optical disk (arrow X1
Direction) and the opposite direction (direction of arrow X2), the high-speed airflow can be blown to the objective lens, so that the dust of the objective lens can be removed more efficiently. By the way, the moving speed of this optical block is, for example, 82 m / sec at the maximum. Since the dust adhering to the objective lens is removed during use of the optical disc device in this way, it is possible to prevent a signal reading (reproduction) error due to a shortage of the amount of light focused on the optical disc. As a result, the optical disk device can reduce the number of returns due to a defect.

In addition to removing dust adhering to the objective lens, it is also used as a dust removing target portion for a guide shaft and other supporting and moving means as shown in FIG. 10 for moving the optical block. By blowing a high-speed air flow, the guide of the optical block is not affected by dust, and the optical block can be moved smoothly.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, a compact disc is shown as an example of the optical disc. In this case, the optical block is used to reproduce the signal recorded on the compact disc. The optical disc is not limited to this, but a magneto-optical disc or other CD-R, CDR
It is of course possible to apply the dust removing device of the present invention to an optical disc device for recording / reproducing (reading / writing) with respect to OM and other types of optical discs.

[0030]

As described above, according to the present invention, while the optical disk is in operation, the dust attached to the object such as the objective lens from which dust is to be removed can be easily removed without damaging the object. Can be removed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire optical disc device having a preferred embodiment of a dust removing device for an optical disc device according to the present invention.

FIG. 2 is a diagram showing a high-speed airflow in the optical block of FIG.

FIG. 3 is a perspective view showing a chassis of an optical block, a cover, and an objective lens.

FIG. 4 is a side view showing an air blowing unit.

FIG. 5 is a plan view showing an air blowing unit.

FIG. 6 is a diagram showing a part of the optical disk device of FIG.

FIG. 7 is a diagram showing a second embodiment of an optical block including a dust removing device of an optical disk device of the present invention.

FIG. 8 is a diagram showing a third embodiment of an optical block including a dust removing device of an optical disk device of the present invention.

FIG. 9 is a diagram showing a fourth embodiment of an optical block including a dust removing device of an optical disk device of the present invention.

FIG. 10 is a diagram showing a fifth embodiment of an optical block including a dust removing device of an optical disk device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Motor (driving means) 4 Optical block (optical moving body) 5 Objective lens 10 Air blowing means 11 Guide shaft (guide means) 14 Air passage 16 First opening 18 Second opening 20 Dust A Air AB High speed Air Flow AC High Speed Air Flow D Optical Disk

Claims (5)

[Claims] 1. A drive unit for rotating an optical disc, a guide unit arranged along the radial direction of the optical disc, and for reproducing information recorded on the optical disc and recording information on the optical disc. An optical moving body that has an objective lens for focusing light on the optical disc and is movable along the guide means; and the optical moving body is provided on the optical moving body, and the optical moving body is the guide means. A dust removing device for an optical disk device, comprising: an air blowing unit for blowing air to a dust removal target portion of the optical moving body that is going to remove dust when moving along. 2. The dust of the optical disk device according to claim 1, wherein the air blowing unit has a first opening for taking in air and a second opening for squeezing the taken-in air and giving it to the dust removal target portion. Removal device. 3. The dust removing device for an optical disk device according to claim 1, wherein the dust removing target portion is the objective lens. 4. The dust removing apparatus for an optical disk device according to claim 1, wherein the dust removing target portion is the guide unit. 5. The dust removing device for an optical disk device according to claim 4, wherein the guide means is a plurality of rod-shaped bodies.