JPS63253584A - Optical disk memory device - Google Patents

Abstract

PURPOSE:To clean only necessary place and to execute the cleaning of high reliability without giving any damage on the disk surface by providing the actuator working the dust removing means of an optical disk at the stationary side of a memory device. CONSTITUTION:In the case of a large dust sticking on the surface of an optical disk 1, an unrotatable error signal 20 is transmitted from an error correction circuit 12 and a motion command is transmitted on a mechanism driving circuit 14 by the decision of a microprocessor 13. The circuit 14 drives a rotary actuator 16 to move a pin 8 upwards, a lever 7 is rotated to push down one end of a lever 9, the lever 9 is rotated centering around a fulcrum 10 and the tip of a brush 6 is brought into contact with the surface of the disk 1 to remove the dust thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field to Which the Invention Pertains> The present invention provides an optical disk storage device that includes an optical disk cleaning device for removing dust attached to an optical disk.

<Prior art> Conventionally, in optical disk storage devices, dust adhering to the focusing lens surface of the optical head and the surface of the optical disk scatters the laser beam, resulting in a deterioration of the signal-to-noise ratio and a decrease in the recording/reproduction rate. The problem is that it is increasing. In particular, since the laser beam is focused on a minute spot on the surface of the optical disk, if the light is scattered by attached dust, both the amount of irradiated light and the amount of reflected light will be greatly reduced. For this reason, the detection signal level decreases significantly (Dust adhering to the surface of an optical disk is a major cause of signal quality deterioration, and it is desired to develop an efficient and highly reliable leaning device for the optical disk surface in optical disk storage devices. ing.

By the way, since the surface of an optical disc is usually formed of a plastic base material, there is a concern that if some kind of substance comes into contact with it to remove attached dust etc., scratches will occur to some extent and the reliability of the optical disc will be impaired. . This
In order to avoid this, it is conceivable to remove the attached dust and the like using a non-contact means such as an air jet, but in this case, the removal efficiency is expected to be low.

<Object of the Invention> In order to improve these drawbacks, the present invention provides a highly reliable dust removal means that can clean only the necessary parts when necessary and remove dust attached to the disk surface without damaging it. The present invention provides an optical disk storage device.

<Structure of the Invention> According to the present invention, a means for removing dust on the surface of an optical disk is disposed on the optical head body, and an actuator for operating the removing means as necessary is disposed on the fixed side of the optical disk storage device. The main feature is that cleaning is performed automatically and locally as needed. Conventional cleaning equipment includes dust removal means and WjAvJJ
The methods are different.

Embodiment> FIG. 1 is a diagram illustrating a first embodiment of the present invention,
1 is an optical disk, 2 is a spindle motor, 3 is an optical head, 4 is a positioner, 5 is a guide rail, 6 is a dust removal brush, 7 is a brush drive lever, 8 is an actuator turbine, 9 is a brush support lever, 10 is a rotational fulcrum of the brush support lever, and 16 is an actuator.

The brush 6 is made of polymer fibers, feathers, animal hairs, etc. of any thickness, and has a total thickness of 1 to 511 m1.

The center of the objective lens 31 of the optical head 3 and the center of the brush 6 are arranged on the same circumference of the optical disk 1. Further, both ends of the lever 7 are supported so as to be freely rotatable, and one end has a power transmission section 7 in contact with an actuator pin 8.
There is 1. The actuator pin 8 moves up and down (in the surface direction of the optical disc), and a rotary actuator 16 using an electromagnetic solenoid can be considered as a driving source. However, the functionality of the present invention is not limited in any way even if other actuators are used. Furthermore, biasing springs 72 and 91 are provided at one end of the lever 7 and the brush support lever 9, as clearly shown in FIG. 3, in order to prevent the brush from coming into contact with the surface of the optical disc 1 when the brush is not operated. There is.

FIG. 2 is a diagram illustrating the circuit system of the first embodiment of the present invention. 11 is a reading signal detection circuit from the optical disk 3; 12 is an error correction circuit; 13 is a microprocessor that determines the necessity of operating the cleaning mechanism (6 to 10) based on the result of the error correction circuit 12; 14 is a cleaning mechanism This is a drive circuit.

Next, an overview of the operation will be explained.

The optical head may not be able to continue recording the recorded signal due to deterioration of the recording film, scratches on the surface of the optical disk, lack of head followability, etc., resulting in so-called reading errors. The signal detected in the normal read signal detection circuit $11 is made into a pulse, and the error correction circuit 12 recovers and corrects the read error using software to obtain a correct read signal. However, sometimes it is not possible to recover from a read error. For example, unrecoverable errors occur when large amounts of dust adhere to the surface of an optical disk. In such a case, the error correction circuit 12 generates a non-rotation error signal 20, and the microprocessor 13 makes a judgment and issues an operation command pulse to the cleaning mechanism drive port $14.

The cleaning mechanism drive circuit 14 drives an actuator such as a four-chrysolenoid according to the operation command pulse, and moves the actuator bin 8 upward in the direction of the arrow as shown in FIG. By rotating the lever 7 in the direction of the arrow, one end of the brush support lever 9 is pushed down, so the brush support lever 9 rotates around the rotational fulcrum 10, and the tip of the brush 6 is aligned with the optical disc 1. in contact with the surface
Remove dust adhering to the surface of the optical disc.

After the cleaning mechanism drive circuit 14 is operated for a predetermined period of time and cleaning is completed, the microprocessor again commands the head to read the signal, thereby reading out the signal.

If necessary, drive the cleaning mechanism and repeat the signal reading operation multiple times until correct reading is completed.

FIG. 3 shows another embodiment of the cleaning mechanism.

The second embodiment is characterized in that a miniature bearing 15 is provided at a portion of the brush support lever 9 that contacts the lever 7. In this embodiment, the optical head 1 can be moved in the radial direction of the optical disk while keeping the brush 6 in contact with the optical disk. Because of this, for example, if dust cannot be completely removed even after operating the cleaning mechanism and an unrecoverable reading error occurs, the optical head 1 should be moved while the brush 6 is in contact with the optical disk surface. by the positioner 4, in the radial direction by a minute amount (for example, 0.1~
1ine) can be swung. In this way,
Dust removal ability can be improved.

If conductive acrylic fiber or the like is used as the brush material,
At the same time as removing dust, it removes static electricity from the disk and reduces the effect of dust on the disk.

In this way, in the present invention, the dust removal means and the actuator for operating the dust removal means are separated, and are respectively disposed on the positioner and on the fixed part of the optical storage device, so that the weight of the optical head can be reduced to a minimum. There is no need to increase it. This has an extremely advantageous engineering point in that it does not impair the high-speed movement performance of the optical head due to displacement, which is most important for optical disk storage devices.

Furthermore, the present invention is equipped with an actuator for operating the dust removal means and is structured to perform cleaning as necessary, so that the loss caused to the optical disc surface during cleaning can be minimized.

<Effects of the Invention> As explained above, in the present invention, since the dust removal means is disposed on the positipina, optical disk cleaning can be performed immediately, automatically, and locally within the optical storage device as needed. I can do it. In addition, since it can be constructed compactly, even if the disc is in a cartridge, the dust removal means can be inserted through the window and cleaning can be performed. Furthermore, since the structure is such that the actuator is operated and cleaning is performed as necessary, damage to the disk surface can be minimized, and practical effects such as highly reliable cleaning can be achieved. .

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing a first embodiment of the present invention, Fig. 2 is an explanatory diagram of an operating state circuit system of the first embodiment, and Fig. 3 shows a second embodiment of the invention. Configuration diagram, Figure 4 is A of Figure 3
FIG. In the drawing, 1... optical disk, 2... spindle motor, 3...
... Optical head, 4. Positioner, 5. Guide rail, 6. Dust removal brush, 7. Brush drive lever, 8. Actuator bin 911. Brush support lever, 1o...Rotation fulcrum, 11...Read signal detection circuit, 12...Error correction circuit, 13...Microprocessor, 14...Cleaning mechanism drive circuit, 15...Bearing, 16...actuator.

Claims (2)

[Claims] (1) A flexible dust removal means that contacts and removes dust on the surface of the optical disk is provided on a positioner that moves the head in the disk radial direction in an optical disk storage device, and an actuator that operates the dust removal means is connected to the positioner of the optical disk storage device. An optical disk storage device characterized in that it is provided on a fixed side. (2) The optical disc storage device includes an optical disc signal reading error detection circuit, and an actuator drive circuit that drives an actuator for a certain period of time to operate the dust removal means in synchronization with the output of the reading error detection circuit. An optical disc storage device according to claim (1).