JPH07114735A - Posture adjusting mechanism for optical pickup - Google Patents

Abstract

PURPOSE:To adjust inclination of an optical pickup supported freely turnably by a holder by a simple mechanism. CONSTITUTION:The optical pickup 1 is supported freely turnably around turning shafts 1b and 1c. A shaft 1d erected on the optical pickup 1 is engaged with a groove 3b of a driven member 3. A shaft 4b of a gear 4 is inserted into a round hole provided on the driven member 3, while the shaft 4b is freely turnably supported by the holder 2. The driven member 3 is energized to the left by a compression coil spring 5 interposed between the holder 2 and the driven member 3, and a face can 3a provided on the driven member 3 is in press-contact with a projection provided on the side surface of the gear 4. When the gear 4 is rotated by an optical pickup inclination adjusting motor, the driven member 3 is moved in the axial direction, and the optical pickup is turned around the turning shafts 1b and 1c so that the posture of the optical pickup can be adjusted.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An optical pickup for an optical disc player must irradiate a laser beam onto the optical disc vertically. Therefore, the tilt of the optical pickup with respect to the optical disc 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 disc.

An example of a conventional optical pickup attitude adjusting mechanism for that purpose is shown in FIG. In the figure, reference numeral 1 is an optical pickup, and an objective lens 1a is held above the optical pickup.
A rotary shaft 1c integral with the optical pickup 1 is rotatably supported by a holder (not shown).

A shaft 1d provided upright on the optical pickup 1 in parallel with the rotating 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 the side surface of the worm gear 12, and the worm gear 12 is rotationally driven by a motor for adjusting the tilt angle of the optical pickup. In this way, the attitude of the optical pickup 1 is adjusted by the rotation of the tilt adjusting motor.

[0005]

The above-mentioned conventional optical pickup attitude adjusting mechanism has the worm gear 12 and the driven member 1.
1 has to be separately supported by the holder of the optical pickup, which has a drawback that the mechanism is complicated.

Further, there is a problem that a large frictional resistance is required to move the driven member 11 by the cam groove provided on the side surface of the worm gear 12 and a smooth operation is difficult to obtain.

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

[0008]

SUMMARY OF THE INVENTION An attitude adjustment mechanism for an optical pickup according to the present invention is an attitude adjustment mechanism for an optical pickup for adjusting an inclination angle of an optical pickup rotatably supported by a holder. A driven member is disposed so as to face the side surface of the gear to which the rotation of the gear is transmitted, and is axially slidably supported by a shaft coaxial with the gear. Engage with shafts standing parallel to each other, a protrusion is provided on one of the facing surfaces of the gear and the driven member, a face cam is provided on the other surface, and the driven member is attached in the axial direction of the gear. The protrusion and the face cam are pressed against each other by being urged.

[0009]

According to the attitude adjusting mechanism of the optical pickup of the present invention, the rotation of the optical pickup tilt adjusting motor is transmitted to the gear, and the driven member is moved in the axial direction by the relative rotational movement between the protrusion and the face cam. The shaft of the optical pickup engaged with the groove is moved to adjust the posture of the optical pickup.

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

Even if the driven member is slidably and rotatably supported by the support shaft, its groove is engaged with the shaft erected on the optical pickup. Good, the support structure for the driven member becomes extremely simple.

Further, although the driven member is moved in the axial direction by the relative rotational movement between the protrusion and the face cam, the contact pressure between the protrusion and the face cam is applied only in one direction, so that the driven member moves smoothly. .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An attitude adjusting mechanism for an optical pickup according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an attitude adjusting mechanism of an optical pickup according to an embodiment of the present invention. In the figure, 2 is a holder for holding the optical pickup 1 and sending it in the radial direction of the optical disk by a sending mechanism (not shown).

The optical pickup 1 holds on its upper part an objective lens 1a for focusing the laser light on the recording surface of the optical disk. Rotating shafts 1b and 1c which are erected coaxially on both right and left sides of the optical pickup 1 pass through the vertical groove 2c and the grooves 2a and 2b provided in the holder 2, respectively. It is supported so that it can move vertically.

Rotating shafts 1b and 1c of the optical pickup 1
Also penetrates a groove provided in a vertical position adjusting lever 6 rotatably supported by the holder 2. When the vertical position adjusting lever 6 is rotated by a drive mechanism (not shown), the optical pickup 1 is moved up and down.

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

As shown in detail in FIG. 2, the shaft 1d provided upright on the optical pickup 1 is engaged with the groove 3b of the driven member 3. The shaft 4b of the gear 4 is inserted into the round hole provided in the driven member 3.
, And 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 to the left in FIG. 2 and a face cam 3 a provided on the driven member 3.
Is pressed against 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 adjusting 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, so that the optical pickup 1 is rotated. You can adjust the posture.

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 side 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 to the lower side, and the rotation 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 around the rotary shafts 1b and 1c, and further urges clockwise around the shaft 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 tilt 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 a magnet so as to attract each other, and the compression coil spring for urging the driven member 3 is omitted. Other configurations are similar to those shown in FIGS. 1 and 2. With such a configuration as well, 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 configured 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 adjusting mechanism of the optical pickup of the present invention, the gear for transmitting the rotation of the optical pickup tilt adjusting motor and the driven member for transmitting the movement to the optical pickup are supported by the same shaft. The configuration is simple because it is installed.

Further, although the driven member is moved in the axial direction by the relative rotational movement between the protrusion and the face cam, the contact pressure between the protrusion and the face cam is applied only in one direction, so that the driven member moves smoothly. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an attitude 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 a posture adjusting 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 adjusting mechanism of an optical pickup.

[Explanation of symbols]

1 Optical Pickup, 1a Objective Lens, 1b Rotating Shaft, 1c Rotating Shaft, 1d Shaft 2 Holder, 2a Groove, 2b Groove, 2c Groove 3 Driven Member, 3a Face Cam, 3b Groove 4 Gear, 4a Projection, 4b Shaft 5 Compression coil spring 6 Vertical position adjustment lever 7 Tension coil spring 11 Driven member 12 Gear

Claims (1)

[Claims] 1. In an attitude adjusting mechanism of an optical pickup for adjusting an inclination angle of an optical pickup rotatably supported by a holder, a driven member is provided so as to face a side surface of a gear to which rotation of an optical pickup inclination adjusting motor is transmitted. The shaft is arranged so as to be axially slidably supported on a shaft coaxial with the gear, and a groove provided on the driven member is engaged with a shaft standing upright on the optical pickup in parallel with the rotation shaft thereof. A light beam is formed by providing a projection on one of the surfaces facing the driven member and a face cam on the other surface, and pressing the driven member in the axial direction of the gear to bring the projection and the face cam into pressure contact with each other. Posture adjustment mechanism.