JPH03203042A - Optical disk device - Google Patents

Abstract

PURPOSE:To prevent the adhesion of dust to an objective lens and the damage of the objective lens by providing an optical head with a protector cover. CONSTITUTION:In a state that a cartridge holder 1 is located at an unloading position, and a carriage 3 is located at a standby position, an opening and closing member 16 turns the protector cover 12 to a direction to cover the optical head 4 by a spring 17 through a cover supporting shaft 13. Therefore, the objective lens 4a is turned into the state it is surrounded by the cap part 12a of the protector cover 12. When a disk cartridge is loaded, the holder 1 is carried to a disk loading position, and the holder 1 strikes the member 16 so as to rotate the member 16, and separates the cover 12 from the head 4. Thus, the adhesion of the dust to the objective lens 4a or the damage of the objective lens due to a foreign matter from an external part can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical disk device that optically reproduces information or records and reproduces information, and in particular, an optical head protection mechanism for preventing dust and damage to an optical head. Regarding.

[Prior Art] In an optical disk device that optically reproduces or records/reproduces information (including an optical disk device using a magneto-optical recording method, a so-called magneto-optical disk device), an optical head that reproduces or records/reproduces information on an optical disk is Conventionally, the disk was simply mounted on a carriage that reciprocated in the radial direction of the disk along a guide rod, and no protection mechanism was provided for the purpose of preventing dust or damage.6 [Problems to be Solved by the Invention] In the above conventional structure, Since the objective lens of the optical head is always exposed inside the device, there is a risk that dust may adhere to the objective lens, degrading its performance, or that foreign matter from the outside may hit the objective lens and damage it.

The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an optical disc device that can prevent dust from adhering to the objective lens of an optical head and from damaging the objective lens.

[Means for Solving the Problems] The present invention for solving the above problems includes a carriage that is mounted with an optical head for reproducing or recording and reproducing information on an optical disc and moves in the radial direction of the disc, and the optical disc or the optical disc is mounted in a case. In an optical disc device equipped with a holder for loading a disc cartridge housed in a disc cartridge and moving the holder to a disc loading position, the optical disc device includes a movable protective cover that can cover an optical head on a carriage in a standby position, and a movable protective cover that can cover an optical head on a carriage in a standby position; opening and closing of the protective cover, which covers the optical head with the protective cover when the optical disc is not loaded, and separates the protective cover from the optical head in conjunction with the loading operation of the holder when the optical disc is loaded. and an open state holding mechanism that holds the protective cover in an open state when the carriage is away from a standby position.

[Function] In the above configuration, when the carriage is in the standby position and no optical disk is loaded, the protective cover is operated by the protective cover opening/closing mechanism to cover the optical head, preventing dust from adhering to the objective lens of the optical head. This prevents damage to the objective lens.

When the optical disk is loaded, the protective cover is operated by the protective cover opening/closing mechanism and is moved away from the optical head, so that it does not interfere with the operation of the optical head.

Further, when the carriage leaves the standby position, the protective cover is held open by the open state holding mechanism, so the protective cover does not become a hindrance when the carriage returns to the standby position.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing the internal structure of an optical disc device according to an embodiment of the present invention, and reference numeral 1 denotes a cartridge holder on which a disc cartridge, as shown, in which an optical disc is housed in a tooth, is placed and moved to a disc loading position. It is. The cartridge holder 1 is guided along the groove 2a of the side plate 2. Reference numeral 3 denotes a carriage on which an optical disc 4 is mounted, and is guided by a guide rod 6 via a rotating roller 5 and driven back and forth in the radial direction of the disc. Reference numeral 7 denotes a locking mechanism for locking the carriage 3 in the standby position (the position of the carriage shown in ta). The cartridge holder includes a rotating shaft 9 that rotatably supports one end of the U-shaped portion 8a of the locking member 8, and a tension spring 10 that biases the locking member 8 toward the front side of the apparatus (lower left direction in FIG. 1). 1 includes an unlocking member 1 that can engage the lever portion 8b of the locking member 8.
1 is attached.

Reference numeral 12 denotes a protective cover for protecting the optical head 4, which is integrally fixed to the cover support shaft 13, and as shown in FIG. We are preparing for

Both ends of the cover support shaft 13 are rotatably supported by a support stand 14.

A protective cover opening/closing mechanism 15 is provided on the cover support shaft 13 . The protective cover opening/closing mechanism 15 includes a single-shaped opening/closing member 16 fixed to the cover support shaft 13, and a counterclockwise direction (i.e., the protection cover 12 is rotated around the cover support shaft 13 in a counterclockwise direction in FIG. 1). 4), and a sensor 18 that engages when the opening/closing member 16 is rotated by a predetermined angle clockwise in FIG.
It consists of etc.

The open state holding mechanism 19 that holds the protective cover 12 in a state away from the optical head 4, that is, in an open state, is connected to the cover support shaft 13.
A rocking member 20 is rotatably attached to the rocker, and the rocking member 20 is rotated clockwise in FIG.
It consists of a torsion spring 21 that biases in the same direction as the opening direction), an integral locking pin 22 that protrudes from the side of the swinging member 20, a protrusion 23 formed on the upper surface of the carriage 3, etc. .

Further, a gear 24 is fixed to an intermediate portion of the cover support shaft 13, and a gear 25 that meshes with this gear 24 is attached to a shock absorber 26 to constitute a shock absorbing mechanism.

Next, the operation will be explained.

1, 2, 3(a), and 4(a) show the cartridge holder 1 in the unloading position and the carriage 3 in the standby position. In this state, the opening/closing member 16 is moved by the spring 17 as shown in FIG.
b) In FIG. 1, the protective cover 12 is biased counterclockwise, and the protective cover 12 is rotated counterclockwise, that is, in a direction to cover the optical head 4, via the cover support shaft 13 integrated therewith. Therefore, as shown in FIG. 2, the objective lens 4a of the optical head 4 is surrounded by the cap part 12a of the protective cover 12, preventing dust from adhering to the objective lens 4a or foreign matter from the outside. Objective lens 4a
This will prevent problems such as damage to the Further, the protrusion 23 on the carriage 3 twists the swinging member 20 into the spring 21.
The locking bottle 22 is pushed up against the reaction force of the protective cover 1.
2 (part of the protective cover 12)
12b is maintained in a state where there is a gap.

That is, the locking pin 22 does not interfere with the protective cover 12.

Further, as shown in FIG. 1 and FIG. 4(A), the locking member 8 of the locking mechanism 7 accommodates the rotating roller 5 of the carriage 3 in its U-shaped portion 8a, so that the carriage 3 is moved from the standby position. Locked to prevent movement.

When the disk cartridge is loaded in the state shown in FIG. 3 (A), that is, when the cartridge holder 1 with the disk cartridge placed thereon is sent to the disk loading position, the cartridge holder 1 is moved as shown in FIG. hits the opening/closing member 16 and rotates the opening/closing member 16 clockwise around the cover support shaft 13, and the protective cover 12, which moves together with the cover support shaft 13, is rotated clockwise and is separated from the optical radar 4.

When the cartridge holder 1 is fed in, Fig. 4 (mouth)
As shown in the figure, the unlocking/picking member 11 attached to the cartridge holder 1 hits the tip of the lever part 8b of the locking member 8 and rotates it clockwise in the figure around the rotating shaft 9, thereby locking the rotating roller 5. is canceled. That is, the lock of the carriage 3 is released, and the carriage 3 can be moved from the standby position.

When the carriage 3 in the standby position moves to the operating position as shown in FIG. 3 (C) and FIG. As a result, the stop pin 22 hits the bracket 12b integrated with the protective cover 12, and the protective cover 12 is prevented from rotating counterclockwise in the figure.

When the cartridge holder 1 is taken out in the state shown in FIG. 3 (c), the protective cover 12 is moved counterclockwise as shown by the broken arrow in FIG. 3 (2) by the force of the spring 17 of the protective cover opening/closing mechanism 15. Although it attempts to rotate, the locking pin 22 hits the bracket 12b of the protective cover 12, so the protective cover 2 is prohibited from rotating clockwise and is held open as shown in the figure. Therefore, the protective cover 12 does not become a hindrance when the carriage 3 returns to the standby position.

When the carriage 3 returns to the standby position, the protrusion 23 on the carriage 3 contacts the swinging member 20 and pushes it up and rotates it, so the protective cover 12 is released from the locking pin 22 and the protective cover can be opened and closed. Spring 1 of structure 15
The optical head 4 is rotated counterclockwise by a force of 7, and returns to its original state covering the optical head 4 as shown in FIG. 3(a).

In addition, in the embodiment, the protective cover is rotated vertically around the cover support shaft integrated with the protective cover to cover the optical head, but the structure is not limited to this, and the structure is such that the protective cover is simply moved vertically to cover the optical head. It is also possible to do so.

Further, the protective cover opening/closing FI & ellipse is not limited to the mechanism of the embodiment, and various modifications can be made. In short, when the carriage is in the standby position and an optical disc is not being loaded, it covers the optical head, and during loading, the protective cover is moved from the optical head in conjunction with the movement of the holder (not necessarily mechanically interlocked). It's fine if you can let go.

Further, the open state holding mechanism is not limited to the mechanism of the embodiment. In short, any mechanism that can hold the protective cover open when the carriage is away from the standby position is sufficient.

In the above embodiment, an optical disc device that uses a disc cartridge containing an optical disc in a case and has a cartridge holder on which the disc cartridge is placed was described. Naturally, the present invention can also be applied to optical disc devices that use the same technology.

[Effects of the Invention] As explained above, according to the present invention, a movable protective cover that can cover the optical head is provided, and the protective cover does not allow the optical head to be illuminated only when the carriage is in the standby position and an optical disk is loaded. Since the structure covers the head, it is possible to effectively prevent dust from adhering to the objective lens of the optical head and damage to the objective lens.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part of the internal structure of an optical disk device showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a portion of a protective cover, and FIGS. <2> is an explanatory diagram showing step by step the operation of the protective cover opening/closing mechanism and the open state holding mechanism;
B), (C), and (D) are explanatory diagrams showing the operation of the locking mechanism step by step. DESCRIPTION OF SYMBOLS 1... Cartridge holder (holder), 3... Carriage, 4... Optical head, 7... Lock mechanism, 8...
...Lock member, 12...Protective cover, 12a...
Cap part, 13... Cover support shaft, 15... Protective cover opening/closing mechanism, 16... Opening/closing member, 17... Spring, 19... Open state holding mechanism, 20... Rocking member, 2
1... Torsion spring, 22... Locking pin (locking piece),
23...Protrusion, 26...Buffer (II shock mechanism).

Claims (4)

[Claims] (1) A carriage is provided which is equipped with an optical head for reproducing or recording/reproducing information on an optical disc and moves in the radial direction of the disc, and places the optical disc or a disc cartridge formed by housing the optical disc in a case and moves the carriage to a disc loading position. In an optical disc device equipped with a holder that is moved to a standby position, the protective cover is movable and can cover an optical head on a carriage in a standby position, and when the carriage is in a standby position and no optical disc is loaded, the protective cover is a protective cover opening/closing mechanism that covers the optical head over the optical head and separates the protective cover from the optical head in conjunction with the loading operation of the holder when an optical disc is loaded; An optical disc device comprising: an open state holding mechanism that holds a cover in an open state. (2) The protective cover is provided to be rotatable around a cover support shaft integral with the protective cover, and the protective cover opening/closing mechanism is fixed to the cover support shaft and is fed in when an optical disc is loaded. an opening/closing member that is driven and rotated by the holder or a disk cartridge on the holder to rotate the cover support shaft in a direction in which the protective cover is away from the optical head; and an opening/closing member that urges the opening/closing member in a direction in which the protective cover covers the optical head. The open state holding mechanism is swingably and rotatably attached to the cover support shaft of the protective cover, and is biased toward the carriage by the spring, and when the carriage moves to the standby position, the open state holding mechanism a swinging member that is held at a predetermined angle by contacting a part of the swinging member; and a swinging member that is integrally provided with the swinging member so that when the carriage is in the standby position, it does not interfere with the protective cover and the carriage moves away from the standby position. When the holding by the part of the carriage is released and the rocking member swings toward the carriage side by the force of the spring, it comes into contact with a part of the protective cover, and the protective cover rotates in a direction to cover the optical head. 2. The optical disc device according to claim 1, further comprising a locking piece for inhibiting the locking. (3) The optical disc device according to claim 1, further comprising: a locking mechanism that locks the carriage in a standby position; and an unlocking mechanism that unlocks the carriage when an optical disc is loaded. (4) The optical disc device according to claim 2, further comprising a buffer mechanism connected to the cover support shaft for buffering impactful rotation of the protective cover.