JP2000057620A - Optical recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dust from sticking to an objective lens. SOLUTION: Relating to an optical recording/reproducing device reciprocally driving an optical head pedestal 2 having a rack 8 by a motor 21 through teeth 9b of a feed gear 9, a shutter 24 covering the objective lens 3 when a pickup 4 on the optical head pedestal 2 is placed on a position of an innermost periphery A1 is fitted to the feed gear 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus which prevents dust from adhering to an objective lens.

[0002]

2. Description of the Related Art In an optical disk player that optically reproduces (reads) and records (writes) music information or the like on an optical disk such as a CD (compact disk) and an MD (mini disk), information is recorded on the optical disk. A pickup for irradiating a light beam for reading and writing is provided. FIG. 5 is a perspective view showing a main part of a conventional optical disk player equipped with such a pickup.
A pickup 4 including an objective lens 3 is attached via the lens.
Is provided.

A turntable 7 on which an optical disk such as a CD is placed is disposed above the pickup 4. The turntable 7 is rotated by a rotating shaft of a spindle motor provided below the mechanism base 1. It is rotatably supported. The pickup 4 is attached to a feed guide shaft 10 via the optical head base 2, and a thrust is obtained by rotating a gear 9 meshing with a rack 8 formed on the optical head base 2 to obtain an arrow. It is configured to be able to reciprocate along the feed guide shaft 10 as shown in FIG. When the optical disk is placed on the turntable 7, the pickup 4 reciprocates in the radial direction of the optical disk while irradiating the lower surface of the optical disk with a light beam,
It can read and write information.

In such an optical disk player,
Since the pickup 5 has the opening 5 that always exposes the objective lens 3, dust accumulates on the upper surface of the objective lens 3 as time passes. The dust affects the quality of a light beam related to reading and writing of information, for example, the amount of transmitted light and the transmitted wavefront aberration. In the worst case, when the function of the optical head is significantly reduced, the pickup 4 may malfunction and reading and writing of information may become impossible. For this reason, the following dustproof means have been considered to eliminate the influence of dust.

[0005] As shown in FIG. 5, a fixed shaft 12 integral with the shutter 11 is inserted into a bearing portion 13 of the pickup 4, and is located between a spring hook 14 formed on a side surface of the pickup 4 and a spring hook 16 of the shutter 11. A coil spring 15 is provided. On the other hand, a stopper 17 is provided on the mechanism base 1.
Are formed.

During play in which the optical head base 2 moves from right to left along the guide shaft 10 as shown in FIG. 6A, the shutter 11 rotates counterclockwise around the fixed shaft 12 by the action of the coil spring 15. And the objective lens 3 is open. Therefore, reading and writing of information on the optical disk are performed. When the optical head base 2 reaches the innermost position as shown in FIG. 6B, the engaging portion 11a attached to the shutter 11 comes into contact with the stopper 17, so that the shutter 11 is
5 is rotated clockwise against the urging force of 5, and covers the objective lens 3. Therefore, dust and the like do not adhere to the objective lens 3 during non-play.

[0007]

However, a shutter and a coil spring are newly required as parts, the number of assembling steps is increased, and the manufacturing cost is increased.

[0008] In addition, there has been proposed a configuration in which a shutter is opened and closed by a separately provided motor.
Both require new parts and motors.

Therefore, an object of the present invention is to provide an optical recording / reproducing apparatus which solves the above problem.

[0010]

According to a first aspect of the present invention, there is provided an optical recording / reproducing apparatus which is provided so as to be movable in a radial direction of an optical disk and transmits a light beam from a light source to the optical disk. In an optical recording / reproducing apparatus in which an objective lens for focusing on a signal surface is provided and a motor for driving the objective lens is operatively connected to the objective lens via a gear, the objective lens is moved when the objective lens moves to a predetermined position. A shutter provided on the gear is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical recording / reproducing apparatus according to the present invention will be described below. In this embodiment, since a part of the conventional optical recording / reproducing apparatus is improved, the same parts as those of the conventional optical recording and reproducing apparatus will be described with the same reference numerals.

(A) Embodiment 1 As shown in FIGS. 1 and 2, the turntable 7 is linked to a motor 20 provided on the back side of the mechanism base 1. The optical head base 2 movable along the guide shaft 10 includes a motor 21 provided on the back side of the mechanism base 1.
It is linked and linked. That is, it is as follows. As shown in FIG. 1B, a pinion 22 is attached to an output shaft of a motor 21 projecting leftward from the mechanism base 1, and teeth 23 a of an intermediate gear 23 rotatably provided on the mechanism base 1. The pinion 22 is engaged. The teeth 23a of the intermediate gear 23 mesh with the teeth 9a of the feed gear 9 rotatably provided on the mechanism base 1. The teeth 9b of the feed gear 9 are engaged with the rack 8 on the optical head base 2.

The pickup 4 can move in the radial direction of the optical disc (not shown) on the turntable 7 in the range of A _{1 to} A _3. The innermost position at which the pickup 4 can read the TOC is A _2. It is time to occupy the position. In the present invention, the state that is, the objective lens 3 when the non-playing state pickup 4 occupies the position of A ₁
Together cover the shutter 24 as the objective lens 3 is released when the play accounted for A ₂ position is started
Is provided.

The shutter 24 has its proximal end fixed to the vicinity of the outer peripheral surface of the feed gear 9 and is provided so that its distal end faces in the radial direction. The shutter 24 may be formed integrally with the feed gear 9, or may be manufactured separately and then connected by screws or the like. In FIG. 2, reference numeral 6 denotes a guide rail.

Next, the operation of the optical recording / reproducing apparatus will be described. In the non-playing state pickup 4 occupies the position of A _1. At this position, the pickup 4 cannot read the TOC, and the shutter 24 covers the objective lens 3, thereby preventing dust and the like from adhering to the objective lens 3.

[0016] transmitted the motor 21 is rotated to its rotary motion feed gear 9, the pickup 4 is moved to the position of A _2, pickup 4 will be able to read the TOC. At this time, the shutter 24 is rotated to the position of the B _2, there is no problem because the objective lens 3 is opened.

During the play in which the pickup 4 occupies the positions A _{2 to} A ₃ , the shutter 24 rotates around the feed gear 9, so that the shutter 24 does not cover the objective lens 3.

When the feed gear 9 rotates in the reverse direction and the shutter 24
Returning to the ₁ position, the pickup 4 is returned to the position of A _1. That is, when the pickup 4 returns to the non-play state, the objective lens 3 is again covered by the shutter 24, and adhesion of dust and the like to the objective lens 3 is prevented.

(B) Second Embodiment Next, a second embodiment is shown in FIG. In the first embodiment,
Upper surface of shutter 24 and optical disk or turntable 7
In this case, the mechanical deck cover 25 is provided under the turntable 7 because the lower surface of the turntable may come into contact with the lower surface.

In order to support the mechanical deck cover 25, a fixed shaft 9a of the feed gear 9 is extended upward, and the mechanical deck cover 25 is fixed to an end surface of the fixed shaft 9a.
A rib 24 as a projection is provided on the upper surface of the shutter 24.
a is formed. This is provided in order to identify a contact portion of the shutter 24 with the mechanical deck cover 25 at one place and to stabilize the operation.

In such an optical recording / reproducing apparatus, there is no possibility that the shutter 24 comes into contact with an optical disk or the like. Other configurations,
Since the operation is the same as that of the first embodiment, the description is omitted.

(C) Third Embodiment Next, a third embodiment is shown in FIG. This embodiment also
This is to prevent the shutter 24 from coming into contact with an optical disk or the like.

In order for the shutter 24 to be urged toward the pickup 4, the hinge 24 is attached to the shutter 24.
4a is formed, and the shutter 24 is formed in a state where the tip thereof is slightly lowered.

On the other hand, the pickup 4, Figure 1 position from the Figure 4 as the shutter 24 to the position B ₁ is smoothly moved when moving the pickup 4 as shown in (b) of B ₂ of (a) An inclined plate 4a connected to the upper surface is formed.

[0025] In斯Ru optical recording reproducing apparatus in FIG. 1 (a), the shutter 24 from the position of B ₂ non-play condition B ₁
When returning to the position, the lower end of the shutter 24 moves to the upper surface of the pickup 4 via the inclined plate 4a. At this time, since the tip of the shutter 24 is urged toward the pickup 4, it does not come into contact with the optical disk or the like.

[0026]

As can be seen from the above description, claim 1
According to the optical recording / reproducing apparatus according to the above, in the non-play state, the shutter covers the objective lens, so that dust and the like are prevented from adhering to the objective lens, abrupt deterioration of characteristics is prevented, and the life is extended.

By forming the shutter integrally with the gear, the shutter can be provided without increasing the number of parts and without increasing the number of assembly steps. Therefore, the manufacturing cost does not increase.

[Brief description of the drawings]

FIG. 1 is a front view and FIG. 1B is a right side view of an optical recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view of Embodiment 1 of the optical recording / reproducing apparatus according to the present invention.

FIG. 3 is a sectional view of a main part of an optical recording / reproducing apparatus according to a second embodiment of the present invention.

4 (a) is a front view and FIG. 4 (b) is a perspective view of an optical recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a conventional optical recording / reproducing apparatus.

FIG. 6 is a diagram illustrating the operation of a conventional optical recording / reproducing apparatus.

[Explanation of symbols]

 3 Objective lens 6 Guide rail 9 Feed gear 10 Guide shaft 21 Motor 24 Shutter

Claims (1)

[Claims] An objective lens is provided movably in the radial direction of an optical disc and focuses a light beam from a light source on a signal surface of the optical disc, and a motor for driving the objective lens is provided via a gear. An optical recording / reproducing apparatus linked to an objective lens, wherein a shutter for covering the objective lens when the objective lens moves to a predetermined position is provided on the gear.