JP2860236B2 - Optical pickup attitude adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk player, and more particularly to an optical pickup attitude adjusting mechanism for adjusting the tilt angle of an optical pickup so as to vertically irradiate the optical disk with laser light from the optical pickup.

[0002]

2. Description of the Related Art An optical pickup of an optical disk player must irradiate an optical disk with laser light vertically. For this purpose, the tilt of the optical pickup with respect to the optical disk surface is detected by a tilt sensor, and the attitude of the optical pickup is adjusted so that the optical axis of the laser light is perpendicular to the optical disk.

FIG. 4 shows an example of a conventional optical pickup attitude adjusting mechanism for that purpose. In FIG. 1, reference numeral 1 denotes an optical pickup, which holds an objective lens 1a above the optical pickup.
A rotating shaft 1c integrated with the optical pickup 1 is rotatably supported by a holder (not shown).

A shaft 1d, which is provided upright on the optical pickup 1 in parallel with the rotation shaft 1c, is engaged with a groove of a driven member 11 supported by a holder so as to be movable in the left-right direction. The driven member 11 is engaged with a cam groove provided on a side surface of the worm gear 12, and the worm gear 12 is driven to rotate by a tilt adjusting motor of the optical pickup. Thus, the attitude of the optical pickup 1 is adjusted by the rotation of the inclination adjusting motor.

[0005]

The above-described conventional optical pickup attitude adjusting mechanism includes a worm gear 12 and a driven member 1.
1 has to be separately supported on the holder of the optical pickup, and there is a disadvantage that the mechanism becomes complicated.

In addition, there is a problem that the frictional resistance for moving the driven member 11 by the cam groove provided on the side surface of the worm gear 12 is large, and it is difficult to obtain a smooth operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an optical pickup attitude adjusting mechanism which has a simple mechanism and a smooth movement.

[0008]

According to the present invention, there is provided an optical pickup attitude adjusting mechanism for adjusting the tilt angle of an optical pickup rotatably supported by a holder. A driven member is disposed opposite to the side surface of the gear to which rotation of the gear is transmitted, and is supported slidably in an axial direction on a shaft coaxial with the gear. Engage with a shaft that is provided upright in parallel, provide a projection on one of the opposing surfaces of the gear and the driven member, and provide a face cam on the other surface, and attach the driven member in the axial direction of the gear. The projection is brought into pressure contact with the face cam by urging.

[0009]

According to the attitude adjustment mechanism of the optical pickup of the present invention, the rotation of the motor for adjusting the tilt angle of the optical pickup is transmitted to the gear, and the driven member is moved in the axial direction by the relative rotation between the projection and the face cam. The axis of the optical pickup engaged with the groove is moved to adjust the attitude of the optical pickup.

In this mechanism, the gear for transmitting the rotation of the optical pickup tilt angle adjusting motor and the driven member for transmitting the movement of the motor to the optical pickup are supported by the same shaft, so that the configuration is simplified.

Even if the driven member is slidably and rotatably supported on the support shaft, its groove is engaged with the shaft provided on the optical pickup. In addition, the structure for supporting the driven member becomes extremely simple.

The driven member is moved in the axial direction by the relative rotational movement between the projection and the face cam. However, the contact pressure between the projection and the face cam is applied in only one direction, so that the movement of the driven member is smooth. .

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an optical pickup attitude adjusting mechanism according to an embodiment of the present invention. FIG. 1 is an exploded perspective view showing a posture adjusting mechanism of an optical pickup according to an embodiment of the present invention. In the figure, reference numeral 2 denotes a holder which holds the optical pickup 1 and is fed in the radial direction of the optical disk by a feeding mechanism (not shown).

The optical pickup 1 has an objective lens 1a for focusing laser light on a recording surface of an optical disk at an upper portion thereof. Rotating shafts 1b and 1c coaxially provided on both right and left sides of the optical pickup 1 are inserted through vertical grooves 2c and grooves 2a and 2b provided in the holder 2, respectively. It is supported movably up and down.

Rotating shafts 1b and 1c of optical pickup 1
Is also inserted through a groove provided in a vertical position adjusting lever 6 rotatably supported by the holder 2, and when the vertical position adjusting lever 6 is rotated by a driving mechanism (not shown), an optical pickup is provided. 1 is moved up and down.

In this manner, the height position of the optical pickup 1 can be changed when the optical pickup is moved for switching the reproduction surface of the optical disk or when the thickness of the reproduced optical disk is changed.

As shown in detail in FIG. 2, a shaft 1d erected on the optical pickup 1 is engaged with a groove 3b of the driven member 3. A shaft 4b of the gear 4 is inserted into a round hole provided in the driven member 3.
The shaft 4b is rotatably supported by the holder 2. A compression coil spring 5 interposed between the holder 2 and the driven member 3 urges the driven member 3 leftward in FIG. 2, and a face cam 3 a provided on the driven member 3.
Is in pressure contact with a protrusion 4 a provided on the side surface of the gear 4.

When the gear 4 is rotated by an optical pickup tilt angle adjustment motor (not shown), the driven member 3 is moved in the axial direction, and the optical pickup 1 is rotated around the rotation shafts 1b and 1c. Posture can be adjusted.

A tension coil spring 7 is hung between the optical pickup 1 and the holder 2. The tension of the tension coil spring 7 pulls the optical pickup 1 to the right in FIG. 1, and the rattling due to the play between the holder 2 and the optical pickup 1 is removed. The tension of the tension coil spring 7 further pulls the optical pickup 1 downward and the rotating shafts 1b and 1c.
Is pressed against the lower edge of the groove of the vertical adjustment lever 6.

The tension coil spring 7 further urges the optical pickup 1 clockwise about the rotation axes 1b and 1c, and also urges the optical pickup 1 clockwise about the axis 1d. Therefore, the rotating shafts 1b and 1c are pressed against the right edges of the grooves 2c and 2a,
The shaft 1d is pressed against the left edge of the groove 3b. In this way, the height and the inclination angle of the optical pickup are adjusted without rattling.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the gear 4 and the driven member 3 are made of magnets so as to attract each other, and the compression coil spring for urging the driven member 3 is omitted. Other configurations are the same as those shown in FIGS. Even with such a configuration, the face cam 3a of the driven member 3 is pressed against the projection 4a of the gear 4,
The driven member 3 can be driven by the gear 4 to adjust the attitude of the optical pickup.

Although the embodiment is constructed as described above, the invention is not limited to this. For example, a protrusion may be provided on the driven member 3 and a face cam may be provided on the side surface of the gear 4.

[0023]

According to the attitude adjustment mechanism of the optical pickup of the present invention, the gear to which the rotation of the optical pickup tilt adjustment motor is transmitted and the driven member to transmit the movement to the optical pickup are supported by the same shaft. The configuration is simplified.

The driven member is moved in the axial direction by the relative rotational movement of the projection and the face cam. However, the contact pressure between the projection and the face cam is applied in only one direction, so that the movement of the driven member is smooth. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a posture adjusting mechanism of an optical pickup according to an embodiment of the present invention.

FIG. 2 is a side view showing a main part of a posture adjusting mechanism of the optical pickup.

FIG. 3 is a side view showing a main part of an attitude adjustment mechanism of an optical pickup according to another embodiment of the present invention.

FIG. 4 is a side view showing an example of a conventional attitude adjustment mechanism of an optical pickup.

[Explanation of symbols]

Reference Signs List 1 optical pickup, 1a objective lens, 1b rotation axis, 1c rotation axis, 1d axis 2 holder, 2a groove, 2b groove, 2c groove 3 driven member, 3a face cam, 3b groove 4 gear, 4a projection, 4b axis 5 Compression coil spring 6 Vertical position adjustment lever 7 Tension coil spring 11 Follower member 12 Gear

Claims (1)

(57) [Claims] 1. An optical pickup attitude adjusting mechanism for adjusting the tilt angle of an optical pickup rotatably supported by a holder, wherein a driven member is opposed to a side surface of a gear to which rotation of an optical pickup tilt adjusting motor is transmitted. The optical pickup is arranged and slidably supported on a shaft coaxial with the gear in the axial direction, and a groove provided on the driven member is engaged with a shaft erected on the optical pickup in parallel with the rotation axis thereof, and the gear and the A light in which a projection is provided on one of the surfaces facing the driven member and a face cam is provided on the other surface, and the projection is pressed against the face cam by biasing the driven member in the axial direction of the gear. Pickup attitude adjustment mechanism.