JP3495650B2 - Adjustment device for optical pickup - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup adjusting device for adjusting the optical axis of an optical pickup. 2. Description of the Related Art An optical disk player irradiates a laser beam from an optical pickup onto an optical disk which is driven to rotate, and reads recorded information on the optical disk by processing the reflected light. [0003] If the optical axis of the optical disk is displaced from the optical disk, jitter occurs (see Japanese Patent Application Laid-Open No. 10-21443).
No. 2, JP-A-10-124907), it is necessary to adjust the optical axis so that it becomes a minimum value. FIG. 5 is a cross-sectional view of a portion related to the adjusting device. Reference numeral 100 denotes a base for supporting an optical pickup (not shown), and a plurality of through holes 101 and recesses 102 are formed as a set. Have been. Reference numeral 110 denotes a substrate on which a motor for driving a turntable (not shown) is fixed, on which two shafts 111 and 112 are fixed. One shaft 11
1 is inserted into the through hole 101 of the base 100, and the other shaft 112 is inserted into the recess 102 of the base 100 via the adjusting body 130. A screw 140 is screwed to one shaft 110, and a coil spring 150 is interposed between the screw 140 and the base 100. A cam 131 is formed on the upper surface of the adjusting body 130, and the cam 131 is configured to abut on a contact portion 160 provided on the lower surface of the base 100. [0005] In the above configuration, by rotating the adjusting body 130 and changing the contact position between the cam 131 and the contact portion 160, the base 100 is supported on one shaft 111 as a fulcrum.
Will go up and down. Incidentally, the optical axis is in the radial direction of the disc,
Since it is necessary to adjust in the circumferential direction, the support structure is provided in at least two places, and
In order to stably attach to the support 10, it is necessary to provide at least one fulcrum. [0007] However, in recent years, an optical reproducing apparatus for reproducing information by an optical pickup has been mounted on a so-called notebook type computer or the like. Whereas
In the above configuration, since two shafts need to be arranged at one place, a large space is required, which is not suitable for downsizing. According to the present invention, there is provided an optical pickup adjusting apparatus comprising: a base for slidably supporting an optical pickup; a substrate on which the base is placed; and a substrate provided on the substrate. A plurality of shafts, a plurality of through holes provided in the base, through which the shaft is inserted, a flange provided in the through holes, and a plurality of through holes provided on the back surface of the base and near the through holes. A contact portion, an adjusting body provided rotatably with respect to the shaft, and a cam portion that comes into contact with the contact portion when the shaft is inserted into the through hole; and the shaft through the through hole. And a spring interposed between the screw and the flange, and by rotating the adjusting body, the contact portion against the bias of the spring is provided. It is characterized in that the contact position of the cam portion is changed and the optical axis of the optical pickup is adjusted. It is a sign. Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an optical pickup in an optical reproducing apparatus for optically reading information written on a disk. In FIG. 1, reference numeral 1 denotes a rotary drive of a turntable 2 on which the disk is mounted. A metal substrate 3 to which a motor (not shown) is fixed is a base made of aluminum die cast, and is supported by the substrate 1 by an apparatus described later. The base 3 has an exposure of the turntable 2 and an optical pickup 4.
A long hole 5 is formed for performing the guide. A feed shaft 7 that is driven to rotate by a motor 6 fixed to the base 3 is provided in the long hole 5. The optical pick-up 4 has one side mounted on the feed shaft 7 and the other side connected to the periphery of the long hole 5. It is slidably mounted on. Thereby, the optical pickup 4 moves in the long hole 5 by the rotation of the feed shaft 7 (moves in the radial direction of the disk). Now, points A to C indicate the support points of the base 3,
2 is a side cross-sectional view taken along a line ab at a point A, and FIG. 3 is an exploded perspective view of a main part at a point A. 2 and 3, 8
Is a shaft suspended from the substrate 1 and internally threaded from top to bottom. Reference numeral 9 denotes a wheel-shaped adjusting body rotatably mounted on the outer periphery of the shaft, and a slide-shaped cam portion 10 and a guide piece 11 are formed on the upper surface.
Further, adjustment notches 12 and 12 are formed around the adjustment body 9 so as to face each other, and the adjustment notch 1 is formed on the substrate 1.
Arc-shaped adjustment holes 13 and 13 are formed corresponding to 2 and 12, respectively. Reference numeral 14 denotes a through hole through which the shaft 8 is inserted. The three holes having different diameters are continuous, and a flange portion 15 and a space 16 into which a head of a screw 19 described later is inserted are formed inside. ing. Reference numeral 17 denotes a contact portion formed on the lower surface of the base 3, which contacts the cam portion 10 of the adjusting body 9.
Reference numeral 18 denotes a guide groove formed on the lower surface of the base 3, and the adjusting body 9
Guide piece 11 is inserted, and the rotation range of the adjusting body 9 is determined. 19 is a screw to be screwed to the shaft 8, 20 is a screw 19
And a coil spring interposed between the flange portion 15. In this configuration, an adjustment tool (not shown) is inserted from below the substrate 1 through the adjustment holes 13, 13 into the adjustment notches 12, 12, and the adjustment body 9 is rotated to make contact with the adjustment notches 12, 12. The contact position between the portion 17 and the cam portion 10 changes,
The height of the base 3 changes against the urging force of the coil spring 20. In FIG. 1, point C has the same structure as point A, but point B serves as a common fulcrum for adjustment in the radial and circumferential directions. The configuration is as shown in FIG. FIG. 4 is a side sectional view taken along the line cd near point B. In FIG.
A guide groove 18 into which the guide piece 11 of the adjustment body 9 is inserted is formed on the side of the adjustment piece 7, and the groove 18 is formed to have substantially the same size as the guide piece 11, so that the adjustment body 9 cannot rotate. It is like that. However, the contact part 17 is the adjusting body 9
The base 3 can move forward, backward, left and right. In addition, the adjustment stand 21 is the base 3
The height of the lower surface of the base 3 is set so as not to come into contact with the cam portion 10, thereby increasing the freedom of movement of the base 3. To adjust the optical axis of the optical pickup 4 in the radial direction, the adjustment body 9 at the point C is rotated with the points A and B as fulcrums, and the adjustment is performed in the circumferential direction. B point, C
The adjustment body 9 at the point A is rotated with the point as a fulcrum. As described above, since the adjusting portion and the fulcrum are made common, the size can be reduced, and the common fulcrum (point B) can be adjusted to the position of the guide groove 18 of the base 3. Only by changing the shape, the parts at points A and C can be used in common, so that the parts management can be simplified and the assembly efficiency can be increased. As described above, according to the present invention, since the shaft is provided at one place by using the common adjustment portion and the fulcrum, the required space is small and the apparatus can be downsized. Can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an optical pickup according to the present invention. FIG. 2 is a side sectional view taken along a line ab of a portion A in FIG. 1; FIG. 3 is an exploded perspective view of a main part at a point A in FIG. 1; FIG. 4 is a side sectional view taken along the line cd of a portion B in FIG. 1; FIG. 5 is a side sectional view of a main part of a conventional optical pickup. [Description of Signs] 1 Substrate 3 Base 4 Optical Pickup 8 Shaft 9 Adjuster 10 Cam 11 Guide Piece 14 Through Hole 15 Flange 17 Abutment 19 Screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-25466 (JP, A) JP-A-59-36072 (JP, U) JP-A-58-183642 (JP, U) JP-A-63 29228 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B ^7/ 08-7/085

Claims (1)

(1) An optical pickup adjusting device for adjusting an optical axis of an optical pickup with respect to a disk, a base for slidably supporting the optical pickup, and mounting the base. Substrate, a plurality of shafts provided on the substrate, and a plurality of through holes provided in the base to insert the shaft,
A flange provided in the transparent hole, a contact portion provided in the vicinity of and the through hole in the back surface of the base, provided rotatably relative to the shaft, inserting said shaft through hole When doing, an adjusting body provided with a cam portion that comes into contact with the contact portion, and a screw that is screwed to the shaft through the through hole,
A spring interposed between the screw and the flange, and by rotating the adjusting member, a contact position between the contact portion and the cam portion is prevented against the bias of the spring. An optical pickup adjusting device for adjusting the optical axis of the optical pickup.