JPS60182525A - Objective lens cleaner - Google Patents

Abstract

PURPOSE:To remove automatically the dust on the lens surface by setting a cleaning brush for objective lens slidably to a guide shaft and having a contact between the brush and the lens when a disk table is loaded and unloaded. CONSTITUTION:A brush holder 16 holding a cleaning brush 15 for objective lens is set slidably to a guide 17. The brush 15 is usually at rest at the position of the natural length of a spring 18. When a disk table 13 is loaded, a front face 13a of the table 13 presses the holder 16. Then the brush 15 is in light contact with an objective lens 8 and removes the dust on the lens surface. This cleaning is also carried out in the same way when the table 13 is unloaded. Thus the dust on the lens surface can be removed automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an objective lens cleaner for use in a read-out installation of an optical disc player that irradiates a disc with a condensed light beam and reproduces a signal using the reflected or transmitted light. It is.

Conventional Structure and Problems Therein FIG. 1 shows an example of an optical system of a reading device in an optical disc player A7. In FIG. 1, a laser beam emitted from a semiconductor element 1 passes through a collimator lens 2, a grating 3, and a polarizing beam splitter 4.
The light passes through a four-wavelength plate 5 and a fixed mirror 6, and is focused onto a disk 11 by an objective lens 8 attached to an optical system tube 7. The laser beam reflected from the disk 11 passes through an objective lens 8, a fixed mirror 6, a quarter wavelength plate 5, a beam splitter 4, and a cylindrical lens 9, and is converted into an electrical signal by a detector 10. The problem here is that the objective lens 8 has no choice but to be exposed outside the optical system case 12.
There is a 5-9 inch mark on the lens surface. Since the attached dust scatters a portion of the laser light, the amount of laser light transmitted through the objective lens 8 is reduced, and the electrical signal output obtained from the detector 10 is reduced.

For this reason, it is important to remove dust attached to the objective lens 8. Conventionally, as a method for removing this lump, a method has been used in which the surface of the objective lens 8 is wiped with a cotton cloth. However, such conventional methods have to be carried out manually on a regular basis, which is cumbersome, and it is difficult to automatically remove dust on the lens surface when the player is used.

OBJECTS OF THE INVENTION The present invention has been made to overcome the above-mentioned drawbacks of (1) above, and an object of the present invention is to make it possible to automatically remove dust attached to the surface of an objective lens when a disk is attached or detached.

Structure of the Invention In order to achieve the above object, the reading device of the optical disc player of the present invention has an objective lens cleaner of a front loading type in which the recording medium is removed from the front of the play 17 using a disc loading table. In the optical disc player, a brush is provided for cleaning the objective lens of the reading device, and the brush is linked with the movement of the disc loading table when the disc is removed;
Further, the brush is brought into contact with the surface of the objective lens when the disk loading table is stored or taken out.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be described with reference to the drawings (Figs. 2 to 4).
The explanation will be based on Figure).

15 is a brush, and this brush 15 is fixed to a brush holder 16. The brush holder 16 can be moved by a guide 17 on a straight line parallel to the disk surface.

FIG. 2 shows a state in which a front-loading type disc loading table 13 is largely protruded from the front of the player main body 14, and a disc can be loaded or removed. At this time, the brush holder 1G is stationary on the guide 17 at the natural length of the spring 18.

FIG. 3 shows a state in which the disk full+ loading table 13 is being stored in the player body 14, or the player body 14.
This shows the state in the process of being taken out. table 13
In the storage process, the front surface 13a of the table 13 comes into contact with the brush holder 16, and the brush holder 16 is pushed in the direction of the arrow Δ. At this time, the brush holder 16 is
8 is pressed against the front surface 13a of the retable 13. When the brush holder 16 passes over the objective lens 8 at the reading position '3A, the brush 15 lightly contacts the surface of the objective lens 8, and dust on the lens surface is removed. In the process of taking out the table 13, the direction of movement is simply reversed, and the same cleaning is performed.

In Figure 4, the disk loading table 13 is placed 14 in front of the play 17.
Shows the state in which it is stored. At this time, brush holder 1
01, the rightmost position in the figure is 1, and the brush 15 is not above the objective lens 8.

Effects of the Invention As described above, the following effects can be obtained by adding J to the present invention.

■ When attaching/removing the J0 disk to/from the brake 7, the brush moves while touching the surface of the 3/1 lens in conjunction with the opening/closing operation of the disk loading table! By using the 181I, dust attached to the surface of the objective lens can be automatically cleaned.

■ Since the reciprocating motion of the brush is dependent on the reciprocating motion of the disk loading table, there is no need to provide a dedicated drive source for the brush, and the structure is simple.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the optical system of a reading device included in a conventional optical disc player, and FIGS. 2 to 4 show an embodiment of the present invention, and FIG. 3 is a side view showing a state in the middle of the table opening/closing operation, and FIG. 4 is a side view showing the -7-pull storage state. 8...Objective lens, 13...Disc (?1 mounting table), 14...Player body, 15...Brush, 1
G...Brush holder, 17...Guide, 18° spring agent Yoshihiro MorimotoFigure 111 1jQ IU Figure 2Figure 3Figure 4

Claims (1)

[Claims] 1. In a front-loading optical disc player in which the recording medium is loaded and unloaded from the front of the player 17 using a disc loading table, a brush is provided for cleaning the objective lens of the readout device, and this brush is used to clean the disc when loading and unloading the disc. An objective lens cleaner in a readout device for an optical disc play 17, which is linked with the operation of a loading table, and is adapted to bring this brush into contact with the surface of the objective lens when storing or taking out the disc loading table.