JPH0644599A - Information recording or reproducing device including dust protecting mechanism for fixed head - Google Patents

Abstract

PURPOSE:To provide the information recording or reproducing device which can easily remove dust sticking on the external surface of an optical member mounted in the projection port of the fixed head. CONSTITUTION:The optical member 5 for preventing dust from entering the device is provided at the light beam projection port of the fixed head 10. A lever 13 is provided rotatably nearby and outside the light beam projection port of the fixed head 10 and a brush 14 is fixed to the lever 13 on the side of the optical member 5. The lever 13 is rotated against the force of a tension spring as the lower end 15a of a cartridge holder 15 moves down and rotated reversely by the tension spring when the cartridge 15 moves up. Namely, the brush 14 moves on the surface of the optical member 5 each time an optical disk 4 is taken in or out, thereby removing the dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording information on an information recording medium represented by an optical disk and reproducing the recorded information, and more particularly to an information recording or reproducing apparatus including a dustproof mechanism of a fixed head. It is about.

[0002]

2. Description of the Related Art In recent years, in optical disc devices (devices for recording or reproducing information on or from optical discs), optical heads often have a separated structure in order to achieve high-speed seek.

FIG. 4 is a diagram for explaining a conventional optical disk device having an optical head of a separated structure. In FIG. 4, a semiconductor laser 101 is a light source of an optical head, and its emission beam is collimated by a collimator lens 102. In the figure, a polarization beam splitter 103 is provided to split the reflected light from the optical disc 104. The light beam from the collimator lens 102 is transmitted through the polarization beam splitter 103 and further after passing through the optical member 105, the optical path is bent 90 degrees by the flip-up mirror 106, and the optical disk 104 is obtained by the objective lens 107.
Forming a light spot on the surface of the recording medium.

The optical disk 104 is stored in the optical disk cartridge 116, and the cartridge holder 1
It is inserted in 15. The spindle motor 112 is
The optical disc 104 fixed to the base plate 111 and inserted in the cartridge holder 115 is rotated.

A part of the reflected light from the optical disc 104 is branched by the polarization beam splitter 103 and is guided to the signal detection system 108. The signal detection system 108 detects a focus error signal, a track error signal, and a reproduction signal. Various configurations of the signal detection system are known, but in the example of FIG. 4, focus servo is performed by the knife edge method.

The moving head 109 is movable in the radial direction of the optical disk 104 by a linear motor (not shown), and the position of the beam spot is moved in the radial direction of the optical disk 104 by the movement of the head 109, and a predetermined recording is performed. Matched to the area. On the other hand, the fixed head 110 including the semiconductor laser 101, the collimator lens 102, and the polarization beam splitter described above includes a base plate 111.
The fixed head 110 is provided with an optical member 105 at the light beam emission port. This optical member 1
Reference numeral 05 prevents dust from entering the fixed head 110.

As described above, an optical head composed of a fixed head and a moving head is generally called an optical head having a separated structure, and only the minimum necessary members are moved, so that high speed operation is possible. ing.

[0008]

However, in the conventional device as shown in FIG. 4, dust adheres to the outer surface 105a of the optical member 105, which causes an error in the focus error signal, the tracking error signal, and the reproduction signal. detection,
Further, there is a problem that performance is deteriorated such that detection is impossible. The present invention has been made in view of the above conventional problems, and provides an information recording or reproducing apparatus capable of easily removing dust adhering to the outer surface of an optical member mounted on an ejection port of a fixed head. The purpose is to do.

[0009]

An information recording or reproducing apparatus of the present invention comprises a fixed head section fixed to the apparatus body as an optical head for irradiating an information recording medium with a light beam.
An optical head having a separation structure including a movable head portion movably provided in the apparatus main body for moving a spot of a light beam emitted from the fixed head portion on the information recording medium, The light beam emission port of the fixed head portion is provided with an optical member for preventing dust from entering the fixed head portion, and further, in order to achieve the above object, in the vicinity of the optical member, A lever for moving the information recording medium in the vicinity of the emission port of the light beam is provided in association with the feeding / delivery operation of the information recording medium or the attaching / detaching operation of the driving means, and the lever is provided on the surface of the optical member. There is a brush provided so as to face the tip, and the brush moves on the optical member in accordance with the movement of the lever to remove dust attached to the optical member.

[0010]

In the present invention, the lever with a brush provided near the ejection port of the fixed head moves in association with the feeding / sending operation of the information recording medium or the mounting / detaching operation of the driving means. That is, each time the information recording medium is replaced, the brush moves on the surface of the optical member provided in the fixed head ejection port, and the dust adhering to the surface is removed. Therefore, even if no special cleaning work is performed, the optical member is always kept in a clean state, and there is no inconvenience that the optical beam is blocked by dust, resulting in erroneous detection or undetectable performance deterioration.

[0011]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a schematic side view of the optical disk device according to the present embodiment, and FIGS. 2 and 3 are explanatory views for explaining the operation of the lever.

In FIG. 1, a fixed head 10 is fixed to a base plate 11, receives reflected light from the semiconductor laser 1, collimator lens 2, polarization beam splitter 3, and optical disk 4 to receive a focus error signal and a tracking error. A signal detection system 8 for detecting a signal, a reproduced signal and the like is provided. Further, an optical member 5 for preventing the intrusion of dust is arranged at the exit of the light beam.

The structure of the optical system in the fixed head 10 is similar to that of the conventional device shown in FIG. 4, but in the device of this embodiment, it is located near the light beam exit, that is, near the outer surface of the optical member 5. Is provided with a lever 13 provided with a brush 14 on the optical member 5 side so as to be rotatable. This lever 13 and brush 1
4 constitutes the dustproof mechanism of the fixed head in the present embodiment, the details of which will be described later. Also, flip-up mirror 6
The moving head 9 having the objective lens 7 and the objective lens 7 can be moved on the base plate 11 in the radial direction of the optical disk 4 by a linear motor (not shown), and this configuration is similar to that of the apparatus shown in FIG.

Next, the optical disk 4 is housed in the optical disk cartridge 16, inserted into the cartridge holder 15, and rotatable by the spindle motor 12 fixed to the base plate 11. Here, when the optical disk cartridge 16 is inserted, the cartridge holder 15 presses the optical disk cartridge 16 with a spring member (not shown), and in this state, the center of the optical disk 4 is brought to the center of the spindle motor 12 by a loading motor (not shown). The optical disk cartridge 16 is moved so as to be positioned (this is called a feeding operation).

Center of optical disk 4 and spindle motor 1
When the centers of 2 are aligned, the optical disk 4 is chucked by the spindle motor 12. FIG. 1 shows a state at the time when the feeding operation has already been completed. When the optical disc 4 is inserted, the cartridge holder 1
The lower end portion 15a of the member 5 is in contact with the upper end 13a of the lever 13, and the lever 13 is rotated when the cartridge holder 15 moves downward at the final stage of the above-described feeding operation.

Next, the structure near the lever 13 will be described in detail with reference to FIGS. 2 and 3 are enlarged views of the apparatus of FIG. 1 viewed from the direction of arrow A. FIG. 2 shows a state in which the cartridge holder 15 moves downward, and FIG. 3 shows a state before the cartridge holder 15 moves downward. It shows the state.

In FIG. 2, the lever 13 is attached to the fixed head 10 so as to be rotatable around a rotary shaft 17. A brush 14 is fixed to the hatched portion 13b of the lever 13 so that the tips of the bristles face the back side of the paper (the optical member 5 side). As described above, the optical member 5 is attached to the light beam emitting port of the fixed head 10 to prevent dust from entering the fixed head 10.

The tension spring 18 has a pin 19 at one end.
Is fixed to the fixed head 10 by means of, and the other end is fixed to the lower end of the lever 13 by means of a pin 20. Therefore, the tension spring 18 applies torque in the direction in which the lever 13 rotates counterclockwise in FIG. However, in the state of FIG. 2, the lower end 15a of the cartridge holder 15 is lowered from the position B to the position C, and the torque given by the tension spring 18 is overcome.
The lever 13 is rotated clockwise.

Next, in the state of FIG. 3 (state where the optical disk 4 is taken out), the lower end 15a of the cartridge holder 15 is
Is in the position B, and the lower end 1 of the cartridge holder 15 is
5a is not in contact with the lever 13. Therefore, lever 13
Is rotated counterclockwise by the tension spring 18, but stopped by a stopper 21. In this state, the brush 14 is in a position so as to cover the optical member 5.

Next, the operation of the dustproof mechanism in this embodiment will be described with reference to FIGS. First, before the optical disk 4, that is, the optical disk cartridge 15 is fed into the apparatus, the lower end 15a of the cartridge holder 15 is not in contact with the lever 13, and therefore the state shown in FIG.

Then, the optical disk 4 is sent into the apparatus,
When the feeding operation is completed, the state shown in FIG. 2 is obtained. That is, when the upper end 13a of the lever 13 is pressed, the force of the tension spring 18 is overcome, and the lever 13 rotates clockwise. In the process of shifting from FIG. 3 to FIG.
Since the bristles of the brush 14 fixed to the lever 13 come into contact with the outer surface of the optical member 5 to move, dust on the outer surface of the optical member 5 can be removed.

Similarly, the operation of taking out the optical disk 4 from the cartridge holder 15, that is, the spindle motor 1
In the process of shifting from the state shown in FIG. 2 to the state shown in FIG. 3, the tip of the brush 14 comes into contact with the outer surface of the optical member 5 even during the releasing operation of the chucking 2 or the delivering operation from the cartridge holder 15. Since it moves by moving, the dust adhering to the outer surface of the optical member 5 can be removed.

In this embodiment, when the optical disk 4 is not inserted into the apparatus, the brush 14 covers the optical member 5 as shown in FIG. It is also possible to prevent dust from adhering to the optical member 5.

In the above embodiment, the case where the information recording medium is an optical disk has been described as an example, but it goes without saying that the information recording medium may be a magneto-optical disk. Further, the configurations of the optical systems in the fixed head and the moving head are appropriately changed, and are not limited to the above-mentioned embodiments.

[0025]

As described above, according to the present invention, the optical member provided at the light beam emitting port of the fixed head is interlocked with the feeding / sending operation of the information recording medium or the mounting / detaching operation of the driving means. Since the brush is configured to move on the outer surface, dust attached to the optical member is removed by the brush every time the information recording medium is replaced. That is, the optical member at the light beam emission port can be kept clean without any special cleaning work, and performance deterioration due to dust adhesion can be avoided.

[Brief description of drawings]

FIG. 1 is a schematic side view of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the apparatus of FIG. 1 viewed from the direction A, showing a state where the lower end of the cartridge holder is lowered.

FIG. 3 is a partially enlarged view of the apparatus of FIG. 1 viewed from the direction A, showing a state before the lower end of the cartridge holder is lowered.

FIG. 4 is a schematic side view of a conventional optical disc device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Semiconductor laser, 2 ... Collimator lens, 3 ... Beam splitter, 4 ... Optical disk, 5 ... Optical member, 6 ... Mirror, 7 ... Objective lens, 8 ... Signal detection system, 9 ... Moving head part, 10 ... Fixed head part , 11 ... base plate, 12 ... spindle motor, 13 ... lever, 13a ... lever upper end,
14 ... Brush, 15 ... Cartridge holder, 15a ...
Lower end of cartridge holder, 16 ... Optical disk cartridge, 17 axis, 18 ... Extension spring, 19, 20 ... Pin.

Claims (1)

[Claims] 1. An optical head for irradiating an information recording medium with a light beam, and a drive means for moving the information recording medium relative to the light beam, the predetermined amount of the information recording medium. In an apparatus for recording or reproducing information by irradiating a recording area with the light beam, the optical head includes a fixed head section fixed to the apparatus body and a spot of a light beam emitted from the fixed head section. An optical head having a separation structure comprising a movable head portion movably provided in the apparatus main body for moving on the information recording medium, wherein the light beam emitting port of the fixed head portion is An optical member for preventing dust from entering the fixed head portion is provided, and further, in the vicinity of the optical member, an operation of feeding / sending the information recording medium or an operation of attaching / detaching to / from the driving means. Is provided with a lever that moves in the vicinity of the emission port of the light beam in conjunction with, and the lever has a brush provided so that the bristles are directed to the surface of the optical member. Accordingly, the brush moves on the optical member to remove dust attached to the optical member, and an information recording or reproducing apparatus including a dustproof mechanism of a fixed head.