JPS59148155A - Dust removing device of optical head - Google Patents

Abstract

PURPOSE:To perform the dust removing of an optical head with an inexpensive device which is free from maintenance by providing a contactless dust collecting mechanism to an optical disk device which performs the replacement of a recording media. CONSTITUTION:Either one or both of an optical head 4 and a dustproof device is shifted when an optical disc device starts its working. The dustproof device is set above the optical head and consists of an electrode 8, an insulated member 7 and a support frame 9. When the dust is removed, the voltage is applied to the electrode 8 to polarize the dust on a focusing lens 1. The polarized dust is attracted to the electrode 8. When the dustproof device is over, the relative position between the dustproof device and the optical head 4 is moved. Then the voltage of the electrode 8 is dropped down to zero when the head 4 is not positioned under the dustproof device. Thus the dust comes off the electrode 8.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to optical components for optical disk devices.

In particular, the present invention relates to a non-contact dust removal device suitable for removing dust attached to a focus lens of an optical head.

[Prior art]

Conventionally, recording heads used in magnetic disk drives (1F) etc. have sealed housings as a dust-proof structure with the main purpose of preventing heat leakage. This requires a sealed structure, which increases the size of the device.

It had the disadvantage of being expensive. - In devices such as optical disk devices in which recording media are frequently replaced, it is difficult to create a hermetic or semi-sealed structure as described above, and the adhesion of dust cannot be avoided.

Problems associated with a reduction in the amount of emitted light due to dust adhering to the optical head, especially the focus lens, include the inability to obtain the optical output for writing and the deterioration of autofocus and tracking sensitivity. I had to clean the focus lens.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for removing dust that causes a reduction in the amount of light emitted from an optical head due to the adhesion of dust.

[Summary of the invention]

In order to prevent a decrease in the amount of light emitted from the optical head of an optical disk device, it is necessary to prevent or remove dust from adhering to the focus lens exposed to the outside. A possible solution to this problem is to make the casing airtight or semi-sealed, as is the case with disk devices, but this would make the device expensive and large, and it would be difficult to replace the recording medium. Therefore, in optical disk devices and the like that exchange recording media,
It is difficult to create a structure like the one above. Therefore, it is necessary to take a method to actively remove dust attached to the focus lens. However, to avoid scratching the focus lens, it is necessary to remove dust without contact.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an optical disk device.

The light emitted from the optical head 4 is emitted from the focus lens 1, and the light reflected by the optical disc 2 is transmitted to the square focus lens 1.
1c is incident. Further, the upper cover 3 has a hole corresponding to the movable range of the optical head 4. FIG. 2 is a conceptual diagram of the optical head portion. The optical system of the optical disk device uses light from a semiconductor laser 6, which is a light source, after passing through various optical components.

The light emitted from the focus lens 1, reflected by the optical disk 2, and incident on the focus lens 1 is detected by the detector 5.
Detect with. Optical components other than the focus lens 1 are incorporated into the optical head 4! dust is not attached. FIG. 3 shows a schematic diagram of a method for removing dust attached to a focus lens. When starting up the optical disk device.

One or the other of the optical head and the dust removal device is moved to position the dust removal device above the optical head.

The dust removal device consists of an electrode 8 for attracting dust, an insulating material 7 for electrically insulating the electrode 8 from other conductors, and a support frame 9 for supporting these. However, the support frame 9 can also be used as the upper cover 3. When removing dust, the dust on the focus lens 1 is polarized by applying a voltage to the electrode 8. The polarized dust is attracted to the electrode 8, and dust removal is completed. After the dust removal is completed, when the relative position of the dust removal device and the optical head 4 moves and the optical head 4 is no longer present below the dust removal device, if the voltage of the electrode 8 is set to zero, the attached dust will be removed from the electrode 8. Get away from it and it will fall. Therefore, since no dust remains in the dust removal device, the dust removal ability will not be reduced.

6. Next, FIG. 4 shows an embodiment that deals with a case where the pole 8 and the optical head 4 are easily in contact with each other. In FIG. 4, since the electrode 8 is covered with a dielectric material 10 such as Mylar, the dust removal ability due to static electricity is preserved, and even if the optical head 4 and the dust removal device come into contact, current does not flow to the optical head. There isn't.

An embodiment for increasing the dust removal capacity is shown in FIG. In the example shown in FIG. 5, a needle-shaped electrode is used as the electrode 8, and the electric field gradient at the tip of the electrode 8 is increased to increase the attraction force for dust.

〔Effect of the invention〕

According to the present invention, dust can be removed by an inexpensive and maintenance-free device with a small number of parts.

[Brief explanation of drawings]

FIG. 1 is a general view of an optical disk device, FIG. 2 is a conceptual diagram of an optical system in an optical head, and FIGS. 3 to 5 are structural diagrams of an embodiment of the present invention. 4. 1... Focus lens 2... Optical disc 3... Upper cover 4... Optical head 7... Insulating material 8... Electrode 9... Dust remover support frame 10... Dielectric material 11...Metal Haku Agent Patent Attorney Akio Takahashi 1st Lore 2nd Z Leap, 2. 41st left m = 335---

Claims (1)

[Claims] 1. An optical head consisting of a light source, optical components, and a photodetector;
A dust removal device for an optical head, characterized in that an optical disk device comprising an optical disk as an information recording medium and a motor for rotating the optical disk is provided with a non-contact dust collection mechanism.