JPH07114736A - Position and posture adjusting mechanism of optical pickup - Google Patents

Abstract

PURPOSE:To reduce the number of parts for a position and posture adjusting mechanism of optical pickup. CONSTITUTION:A tension coil spring 7 is fitted between the optical pickup 1 and a holder 2. The optical pickup 1 is drawn to the right front by tension force of the tension coil spring 7, so that backlash due to play between the holder 2 and the optical pickup is eliminated. Moreover, the optical pickup 1 is drawn to the lower side by the tension force of the tension coil spring 7 to bring turning shafts 1b and 1c into press-contact with a periphery of the lower side of a vertically adjusting lever 6. Furthermore, the optical pickup 1 is energized clockwise around the turning shaft 1c, and is moreover energized clockwise around the shaft 1d as well by the tension coil spring 7. Consequently, the turning shaft 1c is brought into presscontact with a periphery of the right side of a groove 2a of the holder 2, while the shaft 1d is brought into press- contact with a periphery of the left side of a groove 3b of an inclination adjusting member 3. Thus, the height and the inclination of the optical pickup is adjusted without backlash.

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 a means for removing rattling due to play between an optical pickup and its supporting member in a position and attitude adjusting mechanism of the optical pickup.

[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.

Further, the height of the optical pickup is adjusted, for example, when the optical pickup is inverted and sent to reproduce both sides of the optical disk. When the attitude and height position of the optical pickup are adjusted in this way, the shaft of the optical pickup is rotatably and vertically movable supported by the holder, and is vertically moved and rotated by an adjusting lever or the like. It
In order to smoothly adjust the position and tilt angle of the optical pickup, it is necessary to have a gap between the shaft erected on the optical pickup and the groove of the holder or the adjusting lever. Then, the shaft of the optical pickup must be pressed against one edge of the groove so that the shaft of the optical pickup does not rattle in the groove.

In the conventional position and attitude adjusting mechanism of the optical pickup, in order to eliminate such rattling, a spring is arranged for each play of each set of the shaft and the groove of the optical pickup so that the shaft of the optical pickup is in each direction. Was urged by.

[0005]

In the above-mentioned conventional position and attitude adjusting mechanism of the optical pickup, the number of springs for eliminating rattling of the optical pickup is large, the number of parts and the number of assembling steps are increased, and the manufacturing cost is high. There was a drawback that

The present invention has been made in view of the above points, and an object thereof is to provide a position and attitude adjusting mechanism of an optical pickup which requires only one spring for eliminating rattling of the optical pickup. To do.

[0007]

According to the position and attitude adjusting mechanism of an optical pickup of the present invention, the left and right rotating shafts which are erected coaxially on the left and right end surfaces of the optical pickup are arranged in the vertical groove and the vertical position of the holder. The optical pickup is inserted into the groove of the adjusting lever, and an axis of the optical pickup which is erected in a direction parallel to the rotating shaft is engaged with a groove provided in the tilt adjusting member, and the optical pickup is rotated by rotating the vertical position adjusting lever. In the position and attitude adjusting mechanism of the optical pickup for adjusting the vertical position of the optical pickup and adjusting the inclination of the optical pickup by moving the inclination adjusting member, the axial direction of the rotating shaft, the vertical direction of the rotating shaft,
A tension coil spring is hung between the optical pickup and the holder so as to extend in a direction having all components in the axial direction of the rotating shaft and the axial direction of the shaft engaging with the groove of the tilt adjusting member. The play of the optical pickup in the direction of the rotation axis, the play between the rotation axis and the groove of the holder, the play between the rotation axis and the groove of the vertical position adjustment lever, and the shaft and tilt angle adjusting member erected on the optical pickup Each shaft is biased in one direction against the play with the groove.

[0008]

According to the position and attitude adjusting mechanism of the optical pickup of the present invention, the tension coil spring hung between the optical pickup and the holder is provided in the axial direction of the rotary shaft, the vertical direction of the rotary shaft, and the rotary shaft. Since it extends in a direction having all the components in the axial direction of the optical axis and the axial direction of the shaft that engages with the groove of the tilt adjusting member, the play in the rotational axis direction of the optical pickup, the rotational axis and the groove of the holder are , The play between the rotary shaft and the groove of the vertical position adjusting lever, and the play between the shaft of the optical pickup and the groove of the tilt adjusting member, the shaft is pressed against one edge of the groove, and The boss of the rotating shaft can be pressed against one surface of the holder, and rattling in all directions can be eliminated.

As described above, since the single tension coil spring removes all rattling in each direction, the number of parts is reduced and the number of assembling steps is reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A position and attitude adjusting mechanism of an optical pickup according to an embodiment of the present invention will be described with reference to the drawings. Figure 1
FIG. 3 is an exploded perspective view showing a position and attitude adjusting mechanism of the optical pickup according to the 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 an objective lens 1a for condensing laser light on the recording surface of the optical disk on its upper part. 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 to switch the reproduction surface of the optical disk or when the thickness of the reproduction optical disk is changed.

As shown in detail in FIG. 3, the shaft 1d provided upright on the optical pickup 1 is engaged with the groove 3b of the tilt angle adjusting member 3. The gear 4 is inserted into the round hole provided in the tilt adjusting member 3.
The shaft 4b is inserted, and the shaft 4b is rotatably supported by the holder 2. The compression coil spring 5 interposed between the holder 2 and the tilt angle adjusting member 3 has the tilt angle adjusting member 3 shown in FIG.
The face cam 3a provided on the tilt angle adjusting member 3 is biased to the left side of the gear 4 and is in pressure contact with the protrusion 4a provided on the side surface of the gear 4.

When the gear 4 is rotated by an optical pickup tilt adjusting motor (not shown), the tilt adjusting member 3 is moved in the axial direction, and the optical pickup 1 is rotated by the rotating shafts 1b and 1c.
The attitude of the optical pickup 1 can be adjusted by rotating it around.

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 left side in FIG. 2, and the rattling due to the play between the holder 2 and the optical pickup is removed. The tension of the tension coil spring 7 further draws the optical pickup 1 downward, and the rotary shafts 1b and 1c are pressed against the lower edge of the groove of the vertical adjustment lever 6.

As is apparent from FIG. 3, the tension coil spring 7 further urges the optical pickup 1 in the clockwise direction around the rotary shaft 1c, and also in the clockwise direction around the shaft 1d. Therefore, the rotary shaft 1c is pressed against the right edge of the groove 2a, and 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.

[0018]

According to the position and posture adjusting mechanism of the optical pickup of the present invention, rattling in all directions of the optical pickup can be eliminated by one tension coil spring hung between the optical pickup and the holder. it can. Therefore, the number of springs for removing rattling is reduced, and the number of assembling steps is reduced.

[Brief description of drawings]

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

FIG. 2 is a side view showing a position and attitude adjusting mechanism of the optical pickup.

FIG. 3 is a front view showing a main part of a position and attitude adjusting mechanism of the optical pickup.

[Explanation of symbols]

1 Optical Pickup, 1a Objective Lens, 1b Rotating Axis, 1c Rotating Axis, 1d Axis 2 Holder, 2a Groove, 2b Groove, 2c Groove 3 Tilt Adjusting Member, 3a Face Cam, 3b Groove 4 Gear, 4a Protrusion, 4b Axis 5 Compression coil spring 6 Vertical position adjustment lever 7 Tension coil spring

Claims (1)

[Claims] 1. A left and right rotary shaft coaxially erected on both left and right end surfaces of an optical pickup is inserted into a vertical groove of a holder and a groove of a vertical position adjusting lever, and the optical pickup is provided with the rotary shaft. The shafts erected in parallel directions are engaged with grooves provided in the tilt adjusting member, the vertical position of the optical pickup is adjusted by rotating the vertical position adjusting lever, and the optical pickup is moved by moving the tilt adjusting member. In the position and attitude adjustment mechanism of the optical pickup that adjusts the tilt angle of
A tension coil spring extending in the axial direction of the rotary shaft, the vertical direction of the rotary shaft, the axial direction of the rotary shaft, and the axial direction of the shaft engaging with the groove of the tilt adjusting member. Between the optical pickup and the holder, and the play of the optical pickup in the direction of the rotation axis, the play between the rotation axis and the groove of the holder, the rotation axis and the groove of the vertical position adjusting lever by the elasticity of the tension coil spring. And a position and posture adjusting mechanism of the optical pickup, wherein each axis is biased in one direction with respect to the play between the axis of the optical pickup and the groove of the tilt adjusting member.