JPH11238232A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply perform precise skew adjustment without depending on a method improving parts precision until a limit in e.g. an optical disk device. SOLUTION: An optical pickup in the optical disk device is fed and driven in the radial direction of the disk along two pieces of pickup guide rails. A rail support position adjustment mechanism consisting of e.g. a leaf spring 13 elastically receiving an end part of a pickup guide rail 5 and a screw 14 depressing the. pickup guide rail 5 and positioning it is provided on a rail support part 8 of at least one end side of at least one side pickup guide rail 5. Although respective parts precision in the inner mechanism of the optical pickup, a pickup transfer drive mechanism, a disk rotation mechanism etc., affect the tilt of time optical axis of the optical pickup for a disk data surface, when the skew adjustment by the rail support position adjustment mechanism is performed, the precise skew adjustment is performed simply without depending on the method improving respective parts precision until a limit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device such as an optical disk device, and more particularly to a skew adjustment mechanism for adjusting a data surface of a disk and an optical axis of a pickup so as to be orthogonal to each other.

[0002]

2. Description of the Related Art In an optical disk device, for example, it is important for a stable reproduction or recording / reproduction that a disk data surface and an optical axis of an optical pickup are perpendicular to each other. Therefore, it is necessary to adjust the skew (tilt) for adjusting the inclination of the optical axis of the optical pickup with respect to the disk data surface (the angle with respect to the normal to the disk data surface). The factors of the skew include skew (tilt of the disc rotation motor) existing in the disc rotation mechanism in addition to the factor of the optical disc itself as a factor on the optical disc side, and exist inside the optical pickup as a factor on the optical pickup side. Skew, skew (inclined pickup guide rail, etc.) existing in the pickup feed drive mechanism, etc.
The total skew including the whole is the skew in the optical disk device.

Conventionally, the skew of the optical disk device has been improved by increasing the accuracy of each component in an internal mechanism of the optical pickup, a pickup feed drive mechanism, and a disk rotation mechanism. Making full use of processing technology, we are working to raise the precision of parts to the limit.

[0004]

In recent years, in an optical disk apparatus which has been remarkably speeded up, the demand for skew improvement has become more severe. It is not easy to meet the requirements described above, and the performance of the product may be degraded depending on the variation in component accuracy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an optical disk apparatus that can easily perform high-precision skew adjustment without using an easy method of improving the precision of parts to the utmost. The purpose is to:

[0006]

According to the present invention, there is provided a disk rotating mechanism for holding and rotating an information recording disk, a pickup for reproducing or recording / reproducing information on the disk, and the pickup. And a pickup feed drive mechanism that feeds and drives the pickup in the radial direction of the disk with two pickup guide rails for guiding the disk in the radial direction of the disk, and rails at both ends of the at least one pickup guide rail. A rail support position adjusting mechanism for adjusting a height position of an end of the pickup guide rail is provided on at least one of the support portions.

According to a second aspect of the present invention, the rail support position adjusting mechanism according to the first aspect comprises an elastic member for receiving the pickup guide rail and a pressing-down positioning means for pressing the pickup guide rail downward.

A third aspect of the present invention is characterized in that the pressing-down positioning means in the second aspect is a screw.

According to a fourth aspect of the present invention, the rail support position adjusting mechanism according to the first aspect is provided at at least three of four rail support portions of the two pickup guide rails.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to an optical disk device of one embodiment shown in FIGS. FIG. 1 is a plan view of a mechanism in an optical disk device of one embodiment, and 1 is a main chassis thereof. The main chassis 1 includes a disk table integrated motor (a disk rotation motor integrated with a disk table) 2 as a disk rotation mechanism for holding and rotating the optical disk, an optical pickup 3 for reproducing or recording / reproducing information on the optical disk, A left and right two pickup guide rails 4 and 5 for guiding the optical pickup 3 in the disk radial direction, and a feed for driving and driving the optical pickup 3 along the pickup guide rails 4 and 5 via a gear mechanism or the like (not shown). A motor 6 and the like are provided. Note that one pickup guide rail 4 is provided as a main shaft for guidance, and the other pickup guide rail 5 is provided as a sub shaft for guidance. The pickup guide rail 4,
The pickup 5, a feed motor 6, and a gear mechanism (not shown) constitute a pickup feed drive mechanism 7 that feeds and drives the optical pickup 3 in the disk radial direction.

As shown in FIG. 2, a rail supporting portion 8 for supporting the end of the pickup guide rail 5 on the outer periphery side of the disk, which is a sub-axis for guiding the optical pickup 3, is vertically movable above and below the end of the pickup guide rail 5. Guide surface 1 for guiding movement
In the part of the skew adjustment rail holder 11 having 1a,
A rail support position adjusting mechanism 12 for adjusting the height position of the end of the pickup guide rail 5 is provided. The rail support position adjustment mechanism 12 is a plate that is an elastic member that receives the pickup guide rail 5. A spring 13;
A screw 14 is a push-down positioning means for pushing down and positioning the pickup guide rail 5 downward. The illustrated screw 14 is screwed into a screw hole 1 a provided in the main chassis 1. As shown in FIG. 3, a rail support portion 9 for supporting the other end of the pickup guide rail 5 and a rail support portion 9 at both ends of the other pickup guide rail 4 which is a main shaft are formed by a conventional general rail. Like the support portion, the structure includes a rail holder 15 that simply and fixedly positions the pickup guide rail 5.

A skew adjustment operation in the above optical disk device will be described. A rail support position adjusting mechanism 12 is provided at a rail support portion 8 on the outer peripheral side of the disk of the pickup guide rail 5 which is a sub shaft for guiding the optical pickup 3.
When the screw 14 is turned and pushed downward, the end of the pickup guide rail 5 is pushed down by the screw 14 and moves downward against the reaction force of the leaf spring 13. When the screw 14 is turned in the loosening direction, the screw 14 moves upward.
Is moved upward by the reaction force of the leaf spring 13. As a result of this adjustment operation, as shown in FIG. 4, the end of the pickup guide rail 5 of the sub shaft on the outer peripheral side of the disk moves up and down with respect to the pickup guide rail 4 fixed at both ends as the main shaft. 5, the inclination (angle α) of the optical axis of the optical pickup 3 with respect to the disk data surface is adjusted. Slope α adjusted in this case
Is a direction orthogonal to the feed direction of the optical pickup 3 (FIG. 1).
(XX direction). Therefore, this adjustment, ie, the skew adjustment, corrects the overall skew including all of the various factors in the internal mechanism of the optical pickup, the pickup feed drive mechanism, the disk rotation mechanism, etc., by simply turning the screw 14. Therefore, high-precision skew adjustment can be easily performed without increasing the accuracy of each component in each mechanism described above to the utmost.

In the above-described embodiment, the rail support position adjusting mechanism 12 is provided only for the rail support portion 8 at the end of the pickup guide rail 5 which is the sub shaft on the outer peripheral side of the disk. The section 9 may be provided with a similar rail support position adjusting mechanism.

Further, both ends of the pickup guide rail 5 which is a sub shaft and the pickup guide rail 4 which is a main shaft
A rail support position adjustment mechanism similar to the rail support position adjustment mechanism 12 may be provided for at least three of the rail support portions of both ends of the rail support portion. In this case, as shown in FIG. 5, it is also possible to adjust the inclination (angle β) of the optical axis of the optical pickup 3 in the optical pickup feed direction (YY direction in FIG. 1) with respect to the disk data surface. That is, in this case, in the XX direction and Y
Skew adjustment in two directions perpendicular to the −Y direction becomes possible, and skew adjustment with higher precision becomes possible.

The rail support position adjusting mechanism is not limited to the above-described configuration using the leaf spring 13 and the screw 14, but various configurations can be considered. In short, it suffices if the support height position of the end of the pickup guide rail can be arbitrarily adjusted.

The present invention is applicable not only to optical disk devices such as CD-ROM drives, but also to magneto-optical disk devices and other various disk devices.

[0017]

According to the present invention, the skew adjustment is performed by adjusting the height position of the end of the pickup guide rail by the rail support position adjusting mechanism provided at the end of the pickup guide rail. Unlike the difficult and limited method of increasing the precision of the parts to the limit as described above, there is an effect that highly accurate skew adjustment can be realized extremely easily. This makes it possible to stably perform data reproduction or recording / reproduction during high-speed rotation, particularly on the outer peripheral side of the optical disk.

According to the second or third aspect, it is possible to obtain an effect that high-precision skew adjustment can be performed with an extremely simple configuration of a pressing-down positioning means using an elastic member and a screw or the like.

According to the fourth aspect, the skew can be adjusted in two perpendicular directions of the optical disk, so that the skew can be adjusted with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a plan view of an internal mechanism of an optical disk device showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a diagram for explaining a point of skew adjustment in the XX direction of the optical disk device of FIG. 1;

FIG. 5 is a diagram illustrating a point of a skew adjustment in the YY direction of the optical disk device of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Main chassis 2 Disk table integrated motor (disk rotating mechanism) 3 Optical pickup (pickup) 4, 5 Pickup guide rail 6 Feed motor 7 Pickup feed drive mechanism 8 Rail support for skew adjustment 9 Rail support 11 Rail for skew adjustment Holder 12 Rail support position adjusting mechanism 13 Leaf spring 14 Screw 15 Rail holder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Kuroki 1-4-4 Shiromi, Chuo-ku, Osaka-shi, Osaka NEC Home Electronics Co., Ltd.

Claims (4)

[Claims] 1. A disc rotating mechanism for holding and rotating a disc for recording information, a pickup for reproducing or recording / reproducing information on the disc, and two pickup guides for guiding the pickup in the radial direction of the disc. A pickup feed drive mechanism for feeding the pickup in the radial direction of the disc with a rail, wherein at least one of the rail support portions at both ends of the at least one pickup guide rail has an end of the pickup guide rail. A disk device provided with a rail support position adjusting mechanism for adjusting a height position of a portion. 2. The disk device according to claim 1, wherein said rail support position adjusting mechanism comprises an elastic member for receiving the pickup guide rail, and a push-down positioning means for pushing down and positioning the pickup guide rail downward. . 3. The disk drive according to claim 2, wherein said pressing-down positioning means is a screw. 4. The system according to claim 2, wherein
2. The disk drive according to claim 1, wherein the pickup guide rails are provided at at least three of four rail support portions.