JPH04245027A - Optical disk device - Google Patents

Abstract

PURPOSE:To enable a dust-proof mechanism of an optical head to be thin and an entire device to be compact in a device for performing recording/reproduction optically. CONSTITUTION:An optical head is placed, a cover 2 with a slit is placed within a traveling range of this optical head, a plate-shaped cap is provided so that the slit of this cover 2 may be covered. When an edge portion 10 of an arm 7 of this plate-shaped cap 6 is placed within a guide portion 8 of a cartridge and is pulled in a specified direction by a spring 9. Therefore, when a cartridge is inserted into the guide portion 8, the plate-shaped cap 6 opens the slit along with it and enables the optical head to be used. Since the cap 6 is slid and is moved, a dust-proof mechanism becomes thin and an entire device can be compact since it is linked with a move of the cartridge.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the mechanical structure of an optical disc device, and more particularly to the structure of a dustproof mechanism.

0002

2. Description of the Related Art FIG. 4 shows a dustproof mechanism 18 of a conventional optical head. The guide section 8 of the disk cartridge is mounted on the base 12 of the optical head device. In the figure, the guide portion 8 is elongated and has a U-shaped cross section, and a pair of openings are arranged to face each other. Then, a predetermined cartridge 13 containing a disk is slid into this opening and guided to a predetermined writing/reading position. That is the position shown in the figure. At this position, the disk in the cartridge 13 is rotated by the action of a spindle motor (not shown), and the optical head 1 reads and writes signals. The optical head 1 is disposed inside (sometimes at the bottom) of this base 12 so as to be able to slide in the radial direction of the disk, and a slit 4 is formed in the base 12 in the movement range of the objective lens 3 of this optical head 1. are doing. This slit 4 makes it possible to irradiate the disk with laser light. As the dustproof mechanism 18, a cap 20 is rotatably disposed near the end of the slit 4 at a position where it is not hidden by the cartridge 13 when the cartridge 13 is disposed. When the optical head 1 is not operating, the optical head 1 is on standby at the previous position, and the cap 20 is rotated by some control means to cover the objective lens 3 of the optical head 1 and provide a dustproof effect. .

0003

[Problems to be Solved by the Invention] In the conventional dustproof mechanism described above, the cap 20 rotates in the thickness direction of the device to cover the objective lens 3, so the thickness of the device must be increased accordingly. It was a necessary structure. Further, since the cap 20 covers only the objective lens 3 instead of the entire slit 4, it is impossible to protect the optical system other than the objective lens 3 from dust.

0004

[Means for Solving the Problems] The optical disk device of the present invention has a slit that surrounds the optical head and exposes the objective lens of the optical head to the outside world within the movement range of the optical head. a cover, a plate-shaped cap that contacts the cover through a low-friction material to close the slit and shield the objective lens from the outside world, and an optical disc engagement that is connected to the plate-shaped cap and provided on the guide section via a spring. It is composed of members.

[0005]

[Operation] By using this unique means, it is possible to prevent the dust-proof mechanism from operating in the thickness direction of the optical disc device.

[0006]

Embodiment One embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. As shown in FIGS. 1 and 2,
Similar to the prior art, it has a base 12, on which a pair of guide portions 8 each having a U-shaped cross section are arranged to face each other. The optical head 1 is slidably arranged inside the base 12,
A cover 2 with a slit 4 is formed in the movement range of the objective lens 3 of the optical head 1. This slit 4
The slit 4 is the same as the slit 4 described in FIG. 4, and is opened in a range that allows the laser beam from the objective lens 3 to be irradiated onto the disk. A plate-shaped cap 6 is slidably disposed on the cover 2 so as to close this opening. Note that a dust-reducing member 5 is attached to the contact surface between the plate-shaped cap 6 and the cover 2. This low dust member 5 is opened so as not to block the slit 4. A pair of arms 7 are formed from both sides of the plate cap 6, and the ends of the arms 7 move in the longitudinal direction of the guide portions 8 inside the pair of guide portions 8 as an optical disc engaging portion 10. Possibly installed. The end of the optical disc engaging portion 10 is constantly pulled by the spring 9. This pulling direction is the direction in which the plate-like cap 6 attached to the optical disc engaging portion 10 closes the slit 4. A spindle motor 11 is provided at the end of the cover 2. The end of the optical disc engaging portion 10 is located closer to the entrance portion 16 of the apparatus than the end of the plate cap 6 on the spindle motor 11 side. With the above configuration, when the cartridge 13 with an optical disk therein is inserted from the entrance portion 16 of the device along the opening of the guide portion 8 in the direction of the arrow 14, the cartridge end portion 15 is moved by a force that attempts to move the cartridge 13. The optical disk engaging part 10 in the guide part 8 is moved against the spring force of the spring 9, and in conjunction with this movement, the arm 7.
The plate-shaped cap 6 is moved. and cartridge 13
is moved in the direction of the arrow 17 by a loading device (not shown) and placed at a predetermined position, the plate cap 6 completely opens the slit 4, and the objective lens 3 of the optical head 1 faces the recording/reproducing surface of the optical disc (not shown). do. In this state, a predetermined recording/reproducing operation is performed. As mentioned earlier, the end of the optical disc engaging part 10 is located closer to the entrance part 16 of the apparatus than the end of the plate cap 6 on the spindle motor 11 side.
3 is set at a predetermined position and ready for recording/reproducing operation, the slit 4 is fully opened.

[0007]

As explained above, according to the present invention, since the dustproof mechanism does not operate in the thickness direction of the device, the thickness of the device can be reduced, and not only the objective lens but also the entire optical system can be protected from the outside world. The dust-proofing effect is perfect because it can be closed and closed from the air, and since the dust-proofing mechanism is linked to the cartridge ejection mechanism, its operation is reliable and the structure is simple.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of only a portion related to the present invention of an embodiment of the present invention.

FIG. 2 is a detailed perspective view of the portion shown in FIG. 1;

FIG. 3 is a side view illustrating the operation of the present invention.

FIG. 4 is a perspective view of an embodiment of a conventional part related to the present invention.

[Explanation of symbols]

1 Optical head 2 Cover 3 Objective lens 4 Slit 5 Low friction material 6 Plate cap 7 Arm 8 Information department 9 Spring 10 Optical disc engaging member 11 Spindle motor 12 Base 13 Cartridge 14, 17, 19 arrow 15 Cartridge end 16　Device entrance section 18 Dust-proof mechanism 20 caps

Claims (1)

[Claims] Claim 1: An optical head that writes information to and reads information from an optical disc, a guide unit that guides a cartridge having an optical disc therein to a predetermined position within an apparatus, and a base on which these are installed. an optical disc device comprising: a cover having a slit that surrounds the optical head within a movement range of the optical head and is opened so that an objective lens of the optical head is exposed to the outside world; a plate-shaped cap that contacts through a low-friction material and closes the slit to shield the objective lens from the outside world;
An optical disc device comprising: an optical disc engaging member connected to a plate-shaped cap and provided on the guide portion via a spring means.