JPS63209084A - Optical system cleaning device - Google Patents

Abstract

PURPOSE:To easily remove a foreign matter adhering to an objective lens surface, and to prevent the generation of the defect of the recording and the reproducing of an information by installing a cleaning mechanism in a cassette, the shape of which is approximately the same as the disk shaped recording medium cassette. CONSTITUTION:When the cassette 1, which is exclusively used for cleaning the objective lens and has the approximately same external shape as the cassette to protect the disk for the recording and the reproducing, is inserted and loaded in a disk driving device 12, and a belt 10 is drawn by the movement of the shutter 3, and a belt pulley 8 rotates, and the rotation of a reduced speed is transmitted to a gear 7 through the belt 9. A cleaner 2, which is in contact with the surface 14A part of the objective lens 14 and removes the foreign matter, is attached at the gear 4, and it transverses the surface 14A part of the objective lens 14 while it is contact-moving, and the adhered foreign matter such as a dust and a debris or the like is removed. Thus, the generation of the defect of the recording and the reproducing of the information can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Description of the Field to which the Invention Pertains] In order to write and reproduce information on a medium using a laser beam, the present invention aims to improve the spot system of the laser beam on the surface of the medium by 1 to 3 pm.
A disk cassette-shaped optical system cleaning device that cleans the surface of an objective lens that converges and moves the laser beam on a medium surface in an optical information recording/reproducing device that records high-density information by forming a small spot of about 100 mL. Regarding.

[Description of Prior Art] Generally, in an optical disk device, a width of 1 to
Information pits with a length of 2 lm or 1 to 3 gm are recorded.

To read information from this information pit, first, a light beam is focused onto a minute spot by an objective lens and irradiated onto the information bit. At this time, the reflected light or transmitted light from the recording medium changes optically depending on the presence or absence of information.

By electrically detecting this change with a photodetector, a reproduced signal corresponding to the information bit can be obtained.

In such an optical disk device, it is extremely important to always accurately scan the information pit array on the recording medium with a minute spot. For this purpose, an autofocus function that corrects the focus shift caused by the warping of the recording medium and an autotracking function that corrects the irradiation position shift due to eccentricity of the recording medium, etc. are required. As a method for realizing this autofocus function and autotracking function, there is an objective lens driving device that moves an objective lens in an autofocus direction and an autotracking direction. Since this device has a strong magnetic circuit and a bearing sliding part machined with high precision, a dustproof case is usually attached to the device to prevent dust from entering from outside.

However, the upper surface of the objective lens and the movable range in the tracking direction are exposed as openings. Therefore, if dirt or other dust from the outside adheres to the objective lens surface,
In particular, if foreign matter adheres to the center of the lens, it becomes impossible to irradiate a laser spot with accurate laser power onto the disk surface, resulting in failures in recording and reproducing information.

[Object of the Invention] It is an object of the present invention to prevent the occurrence of recording/reproduction defects, which are the drawbacks of the above-mentioned conventional examples.

The object of the invention is to provide an optical information recording and reproducing apparatus that records and reproduces information by irradiating a disk-shaped recording medium with a laser beam, in the vicinity of an objective lens that converges and moves the laser beam on the surface of the medium. is provided with a mechanism that moves while contacting or contacting the surface of the objective lens, and this mechanism is achieved by being mounted on a cassette whose external shape is approximately the same as that of the disk-shaped recording medium cassette. .

[Embodiment of the Invention] Fig. 1 is a diagram showing a first embodiment of the present invention, where l is a cassette whose external shape is the same as a cassette that protects a disk for normal recording and playback, and 2 is a surface of an objective lens. A cleaner that works to remove foreign matter (dust, dirt, etc.) by coming into contact with the
7 is a shutter provided for the purpose of bringing the cleaner 2 into contact with the surface of the objective lens; 4 is a gear for linearly moving the cleaner 2; 5 is a spring that is fixed at one end to the gear 4 and at the other end to the bin 6; A gear 8 that transmits displacement to the gear 4 by rotation is a belt wheel that moves in conjunction with the shutter 3, 9 is a belt that transmits displacement between the gear 7 and the belt wheel 8, and IO is the belt wheel. 8 is a belt that transmits the displacement of the shutter 3, and 11 is a pin that fixes the belt 10 to the shutter 3.

2 to 5 are diagrams for explaining the operation of the first embodiment of the present invention, in which 12 is a disk drive device, and 13 is a cassette for inserting the cassette 1 into the disk drive device 12. 0.14 is an objective lens that focuses the laser beam onto the disk, and 15 is the objective lens 14.
16 is a linear motor that enables the optical head to be displaced in the radial direction of the disk; 17 is a spindle motor that rotates the disk; and 18 is a turntable that holds the disk. , 19 is an arm that opens the shutter 3 attached to the cassette 1 by its movement when the cassette 1 is inserted into the disk drive device 12.

In the above configuration, if foreign matter such as dirt or dust adheres to the surface 14A of the objective lens 14 and information cannot be recorded or reproduced with normal laser power on the disk as a recording medium, as shown in FIG. The objective lens cleaning cassette 1 shown in FIG.

When this cassette 1 is inserted and loaded into the disk drive device 12, as shown in FIG. head 1
5 is moved by the linear motor 16 from an arbitrary position A from the center of the spindle motor 17, that is, from the center of the disk, to a position B, which is the innermost data recording area of the disk. Also, when loading the cassette l into the disk drive device 12,
As shown in FIG. 4, the tip 19A of the arm 19 provided in the disk drive device 12 or the cassette
The shutter 3 is fixed to a portion 3A of a shutter 3 provided in the arm 19, and the shutter 3 is opened by rotation around a portion 19B of an arm 19 as the cassette 1 is loaded. Since the above description is common to all embodiments, the description of the second embodiment and subsequent embodiments will be omitted.

Next, as shown in FIG. 5, the internal operation of the cassette 1 is caused by the movement of the shutter 3 during the loading process.
is pulled, the belt pulley 8 rotates, and the decelerated rotation is transmitted to the gear 7 via the belt 9. The rotational force transmitted to gear 7 is converted into linear motion by gear 4. A cleaner 2 is attached to the gear 4 to remove foreign matter by contacting the surface 14A of the objective lens 14, and moves across the surface 14A of the objective lens 14 in synchronization with the rotation of the gear 7 to remove dust and dirt. Removes any foreign matter that may have adhered to it. Furthermore, if the gear 7 continues to rotate, the gear 4 and the cleaner 2 will return to their original state when the gear part is disengaged, since the gear 7 has a structure in which the gears are only disengaged for half a revolution.
pulled back.

FIG. 6 is a diagram showing a second embodiment of the present invention. The second embodiment shows a configuration in which the driving force taken into the cassette by the movement of the cassette itself is used as the driving force for the cleaning mechanism.

The basic configuration is the same as the first embodiment, and a bin 22 provided on the cassette side is connected to a belt pulley 8 via a belt pulley 21 by a belt 20. When this cassette is inserted and loaded into a disk drive device, the bin 22 provided on the cassette side comes into contact with the bin 23 provided on the device main body side and moves. As the bin 22 moves, the belt 20 is pulled, the belt pulley 8 rotates, and the decelerated rotation is transmitted to the gear 7 via the belt 9. The following operation is the first
This is the same as in the embodiment.

FIG. 7 is a diagram showing a third embodiment of the present invention. The third embodiment shows a configuration in which the driving force of a spindle motor that rotates the disk is used as the driving force of the cleaning mechanism. The basic configuration is the same as the first embodiment, and the rotation of the spindle motor at a predetermined number of rotations is transmitted to the gear 24 via the turntable, and further transmitted to the gear 7 connected to the gear 24. The following operation is the same as in the first embodiment.

FIG. 8 is a diagram showing a fourth embodiment of the present invention. In the fourth embodiment, as in the third embodiment, the cleaning mechanism uses the driving force of a spindle motor that rotates the disk, and the rotation of the spindle motor is performed in a circular manner via a turntable. The signal is transmitted to the plate 25. A cleaner 2 is attached to the disc 25.

The reciprocating movement of the cleaner 2 is performed by repeatedly rotating the spindle motor.

FIG. 9 is a diagram showing a fifth embodiment of the present invention. In the fifth embodiment, the driving force of a motor provided inside the cassette is used as the driving force of the cleaning mechanism, and a plurality of the cleaning mechanisms are provided. The basic configuration is the same as the first embodiment, and 2A is a cleaner that comes into contact with the objective lens surface and removes foreign matter (dust, dirt, etc.), and 2B is a cleaner that performs wet cleaning using a cleaning liquid. A cleaner that comes into contact with the lens surface and removes foreign matter (dust, dirt, etc.).
A cleaner that performs dry cleaning using cilia, etc.
26 is an internal motor that is a driving source; 27 is a control circuit that controls the movement of the cleaners 2A and 2B; 28 is a drive circuit for the motor 26; 29 is a power source, and a battery or the like is installed inside the cassette as a power source; 30 is a mode changeover switch which changes the cleaning mode through the control circuit 27. Rotation at a predetermined number of rotations by the internal motor 26 is transmitted to the gear 24 and further transmitted to the gear 7 connected to the gear 24. The rotational force transmitted to gear 7 is converted into linear interlocking by gear 4. Gear 4 includes a dry cilia cleaner 2B that comes into contact with the surface of the objective lens and removes foreign matter, and a wet cleaner 2B that uses a cleaning liquid.
A is attached and moves in the direction of the arrow in FIG. 9 in synchronization with the rotation of the gear 7. First, dry cleaner 2B
traverses the surface of the objective lens while making contact with the surface of the objective lens, removing relatively large foreign matter such as dirt and dust attached to the surface of the objective lens. Next, the gear 7 further rotates by a predetermined angle,
The wet cleaner 2A traverses the surface of the objective lens while making contact with the surface of the objective lens, and foreign matter such as fine dirt and dust remaining on the surface of the objective lens is almost completely removed. Furthermore, if the gear 7 continues to rotate, since the gear 7 has a structure in which the gear is only disengaged for half a revolution, the spring 5 will return the gear 4 and the cleaners 2A and 2B to their original state when the gear part is finished. It is pulled back and the above operation is repeated in the next rotation period of gear 7,
By continuing the cleaning operation, foreign matter such as dirt and dust adhering to the surface of the objective lens is completely removed. The series of operations described above are performed by an internal motor 26 driven by a drive circuit 28 controlled by a control circuit 27, and the cleaning time and number of cleanings are set by a mode selector switch 30.
Internal motor 26 is controlled by control circuit 27 .

FIG. 10 is a diagram showing a sixth embodiment of the present invention. 6th
In this embodiment, as in the fourth embodiment, the driving force of the cleaning a mechanism is the driving force of a spindle motor that rotates the disk, and the rotation of the spindle motor is transmitted to the disk 25 via the turntable. be done. The disk 25 is equipped with a cleaner 2 which is a cleaner that comes into contact with the surface of the objective lens and removes foreign matter (dust, dirt, etc.), and performs wet cleaning using a cleaning liquid.
A and a cleaner 2B that performs dry cleaning using cilia or the like are attached at an angle θ interval.

The reciprocating movement of the cleaners 2A and 2B is performed by repeatedly rotating the spindle motor.

FIG. 11 is a diagram showing a seventh embodiment of the present invention. 7th
In the embodiment, an adhesive substance is used as the cleaning mechanism. Adhesive tapes 2C are arranged concentrically and equally spaced on the disk-shaped circular plate 31. When the cassette is installed in a disk drive device, the surface of the objective lens of the optical head is cleaned using one adhesive tape located on the line of movement of the optical head. In addition, the used adhesive tape 2C is attached to the rotating portion 31 of the disc shown in FIG.
The adhesive tape is rotated 90 times by A, and can be sequentially replaced with the next adhesive tape.

It is clear that the invention is not limited only to the embodiments described above, but that many modifications can be made without departing from the scope of the invention.

[Description of Effects] As explained above, according to the present invention, by using a cassette having almost the same shape as a disk-shaped recording medium cassette equipped with a cleaning mechanism, foreign matter attached to the surface of the objective lens can be easily removed. It becomes possible to remove it.

[Brief explanation of the drawing]

1 and 6 to 11 are diagrams for explaining the present invention in detail, and FIGS. 2 to 5 are diagrams for explaining the operation of the embodiment of the present invention.

Claims (1)

[Claims] An optical information recording system that records and reproduces information by irradiating a disk-shaped recording medium with laser light.
In the reproducing device, a mechanism is provided near the objective lens that converges and moves the laser beam on the medium surface, and the mechanism moves while contacting or contacting the surface of the objective lens, and the mechanism has a disk-like external shape. An optical system cleaning device characterized in that it is attached to a cassette that has almost the same shape as a recording medium cassette.