JP3265970B2 - Skew adjustment mechanism of optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skew adjustment mechanism for an optical disk drive, and more particularly to a skew adjustment mechanism for an optical disk drive for recording and reproducing information on an optical disk recording medium, a magneto-optical disk recording medium, and the like.

[0002]

2. Description of the Related Art Conventionally, a skew adjusting mechanism of an optical disk drive device has been known that a laser beam emitted from an optical pickup is reflected in a vertical direction with respect to the optical disk recording medium surface during recording / reproducing on an optical disk recording medium and is sufficiently reflected to the optical pickup. This mechanism adjusts so-called skew such as warpage of the optical disk recording medium so that light intensity can be obtained.

A skew adjusting mechanism of a conventional optical disk drive will be described with reference to the drawings. FIG. 6 is a front view before adjustment of a skew adjustment mechanism of a conventional optical disc drive device, and FIG. 7 is a front view after the adjustment.

In the figure, α is a skew adjustment mechanism of an optical disk drive, D is an optical disk recording medium, L is a laser beam, P is an optical pickup unit, 2 is a spindle motor, 3 is a turntable, 4 is a guide rail, and 5 is a guide rail. An optical pickup mounting unit, 6 is a pinion gear, and 7 is a skew adjustment motor.

The skew adjusting mechanism α of the conventional optical disk drive device shown in FIGS. 6 and 7 includes a spindle motor 2 and a turn which is fixed to the upper end of the drive shaft 2b of the spindle motor 2 and on which the optical disk recording medium D is placed. A table 3, a guide rail 4 disposed from the center of the turntable 3 to the periphery, an optical pickup mounting unit 5 that is guided on the guide rail 4 and moves linearly, and one end of the optical pickup mounting An optical pickup unit P mounted on an optical pickup mounting unit 5 by being pivotally supported by a pivot 5a provided on the upper surface of the unit 5 and engraved with rack teeth Pb at the other end;
And a skew adjustment motor 7 in which a pinion gear 7b meshed with the pinion gear 6 is attached to a drive shaft 7a.

In such a conventional skew adjusting mechanism α of an optical disk drive, a laser beam is transmitted from an optical pickup Pa of an optical pickup unit P to a recording / reproducing surface Da of an optical disk recording medium D mounted on a turntable 3. Irradiate L.

In the case of FIG. 6 in which the optical disk recording medium D has a skew by detecting the intensity of the return light of the laser beam L, etc., an optical pickup mounting parallel moving while maintaining a predetermined distance from the recording surface of the optical disk recording medium D is mounted. The skew adjustment motor 7 on the unit 5 is driven to rotate, and the optical pickup unit P with respect to the recording / reproducing surface Da of the optical disc recording medium D
Is adjusted as shown in FIG. 7, and the skew is adjusted to the minimum so that the reflected light of the laser beam L is incident on the optical pickup Pa again.

[0008]

However, the skew adjustment mechanism of the conventional optical disk drive has the following drawbacks. That is, the first point is that the optical pickup unit P cannot be moved at high speed because the inertia of the optical pickup mounting unit 5 increases due to the increase in weight due to the addition of the drive mechanism such as the skew adjustment motor 7.

As a second point, it is necessary to add a drive mechanism on the optical pickup mounting unit 5, which has a disadvantage that the structure is complicated and the cost is increased.

Third, when the skew adjusting mechanism is not particularly provided as in the conventional example, the recording / reproducing surface Da of the optical disk recording medium D must be irradiated with the laser beam L perpendicularly without fail. It is necessary to increase the assembly processing accuracy and the component mounting accuracy of each mechanical component such as the motor 2 and the optical pickup unit P, and there is a disadvantage that the cost increases.

Here, an object of the present invention is to provide a skew adjustment mechanism of an optical disk drive device which has a simple configuration and can perform a high-speed servo tracking operation.

[0012]

In order to solve the above-mentioned problems, the present invention employs the following novel characteristic constitution means. That is, a first feature of the present invention is that one end is locked by a holding piece formed protruding from the upper surface of the mechanical chassis, and the other end is pressed and urged toward the spindle motor drive shaft above the opening of the mechanical chassis. An extended spring, a movable bearing that abuts the other end of the spring and pivotally supports the drive shaft at the mechanical chassis opening so as to be movable in a direction parallel to a recording / reproducing surface of an optical disk recording medium; A skew adjustment arm, which is provided at the other end and serves as a swing center for pivotally supporting the drive shaft, one end of which is pivotally supported by the pivot and the other end of which contacts the movable bearing; This is a skew adjustment mechanism of the optical disk drive device, which is constituted by a cam which is in contact with a free end and pivotally supported by a pivot.

A second feature of the present invention is a skew adjusting mechanism of an optical disk drive device in which the cam in the first feature is driven by a motor.

According to a third aspect of the present invention, there is provided a skew of an optical disk drive device, wherein the skew adjustment arm in the first or second aspect has a fixing screw for maintaining an adjustment state by screwing and fixing to the mechanical chassis. It is an adjustment mechanism.

[0015]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a skew adjustment mechanism of an optical disk drive according to a first embodiment of the present invention, FIG. 2 is a front view before and after adjustment, and FIG. 3 is a front view after the same and adjustment.

In the figure, β1 is a skew adjustment mechanism of an optical disk drive, D is an optical disk recording medium, L is a laser beam, P is an optical pickup unit, 101 is a mechanical chassis, 102 is a spindle motor, 103 is a turntable, and 104 is a turntable. Spring, 105 is a movable bearing, 10
6 is a fixed bearing, 107 is a skew adjustment arm, 108 is a cam, 109 is a skew adjustment motor, and 110 is a fixing screw.

A skew adjustment mechanism β1 of the optical disk drive of the first embodiment will be described with reference to the drawings. The skew adjusting mechanism β1 of the optical disk drive device of the first embodiment shown in FIGS. 1 to 3 includes a mechanical chassis 101 and a spindle motor 10 fixed to the lower surface of the mechanical chassis 101.
2, a turntable 103 fixed to the upper end of the drive shaft 102b of the spindle motor 102 and on which the optical disk recording medium D is placed, and one end of which is locked by a holding piece 101b formed protrudingly on the upper surface of the mechanical chassis 101. A spring 104 having the other end extended and formed by being urged toward the spindle motor 102 drive shaft 102b on the opening 101a of the mechanical chassis 101;
A movable bearing 105 pivotally supporting the drive shaft 102b so as to be movable in the opening 101a of the mechanical chassis 101 in a direction parallel to the recording / reproduction surface Da of the optical disc recording medium D; Fixed bearing 1 provided at the end and serving as a swing center for pivotally supporting the drive shaft 102b
And a skew adjustment arm 1 whose one end is pivotally supported by a pivot 107 a and the other end of which is in contact with the movable bearing 105.
07 and a cam 108 which is in contact with the free end of the skew adjustment arm 107 and which is pivotally supported by a pivot 108a.

The drive shaft 102b is swingably supported at two points, that is, a movable bearing 105 and a fixed bearing 106. The movable bearing 105 is connected to the housing 102a of the spindle motor 102 via the opening 101a of the mechanical chassis 101. It is attached so as to swing freely in the left and right directions in the figure.

As shown in FIG. 2, the movable bearing 105 is moved right and left in the figure by a skew adjusting arm 103 which is rotated about a rotation center 3a by a cam 108. or,
The movable bearing 105 is pressed and urged from the opposite side of the skew adjustment arm 103 by the spring 104, and the forces of both are balanced and fixed.

Next, the skew adjustment mechanism of the optical disk drive shown in FIGS. 1 and 2 will be described. If it is found from the intensity of the return light of the laser beam L applied to the optical disc recording medium D that the laser beam L is not perpendicularly applied to the recording / reproducing surface Da of the optical disc recording medium D, as shown in FIG. When the laser beam L is irradiated in the vertical direction in the figure and the optical disc recording medium D is inclined downward to the right, the cam 108 is rotated clockwise about the pivot 108a to skew the portion of the cam 108 having a large outer diameter. When brought into contact with the adjusting arm 103, the movable bearing 105 moves to the left.

Therefore, as shown in FIG.
Rotates counterclockwise around the fixed bearing 106, and the recording / reproducing surface Da of the optical disk recording medium D becomes substantially horizontal. By optimally adjusting the rotation angle of the cam 108 so that the skew detection signal is minimized, the skew of the optical S disk recording medium D can be adjusted to the minimum.

A skew adjusting mechanism of an optical disk drive according to a second embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 9 is a plan view of a skew adjustment mechanism of the optical disk drive according to the second embodiment of the present invention. In the figure, β2 is a skew adjustment mechanism of the optical disk drive, and 109 is a skew adjustment motor.

The skew adjusting mechanism β2 of the optical disk drive of the second embodiment shown in FIG. 4 is similar to the skew adjusting mechanism β1 of the optical disk drive of the first embodiment.
In addition, as an additional component, the pivot 108 of the cam 108
a, and a pinion gear 109b meshed with the pinion gear 108b is connected to the drive shaft 10a.
A skew adjustment motor 109 fixed to 9a is added.

The skew adjustment motor 109 is driven to rotate,
The rotation is transmitted to the cam 108 via the pinion gear 109a and the pinion gear 108b in sequence, and the cam 108 presses the skew adjustment arm 107 to the left in the drawing to urge it.

Then, the spindle motor 102 drive shaft 1
02b is slightly inclined from the vertical direction to the left side in the figure around the fixed bearing 106, and is held at a predetermined position in equilibrium with the elastic force of the spring 104.

By adjusting the rotation angle of the cam 108, the light emitted from the optical pickup Pa is reflected by the recording / reproducing surface Da of the optical disk recording medium D and reenters the optical pickup Pa as shown in FIG. Skew is minimized.

A skew adjustment mechanism of an optical disk drive according to a third embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 14 is a plan view of a skew adjustment mechanism of the optical disk drive according to the fifth embodiment of the present invention. In the figure, β3 is a skew adjustment mechanism of the optical disk drive, and 110 is a fixing screw.

The skew adjusting mechanism β3 of the optical disk drive of the third embodiment shown in FIG. 5 is similar to the skew adjusting mechanism β1 of the optical disk drive of the first embodiment.
In addition, as an additional component, a through-hole 107b is formed through the other end of the skew adjusting arm 107, and the through-hole 107b is formed.
b, a fixing screw 110 is screwed into the chassis base 1
The skew adjustment arm 107 is fixed to the 01 in a freely rotatable manner.

The skew adjusting mechanism β3 of the optical disk drive device of the third embodiment loosens the fixing screw 110 in advance and adjusts the rotation of the cam 108 to adjust the optical disk recording medium D.
After the skew of the skew adjustment arm 1 is minimized, the fixing screw 110 is fastened at the minimum skew position.
03 is maintained in the best position, and the adjustment screw can be arbitrarily adjusted by loosening the fixing screw 110 again.

[0030]

As described above, the skew adjusting mechanism of the optical disk drive of the present invention has the following advantages. In other words, the first point is that no component is added to the optical pickup unit, and the skew of the optical disc recording medium is adjusted by adjusting the inclination angle of the spindle motor drive shaft. There is an advantage that high speed servo operation can be performed without lowering of the moving speed.

Second, since the skew can always be adjusted, there is an advantage that the skew can always be maintained in an optimum state according to an arbitrary optical disk recording medium or an arbitrary position on the optical disk recording medium.

Third, since the adjusting mechanism is fixed by the fixing screw, there is an advantage that the skew which has been optimally adjusted once can be maintained for a long time and can be adjusted as needed.

[Brief description of the drawings]

FIG. 1 is a plan view of a skew adjustment mechanism of an optical disk drive according to a first embodiment of the present invention.

FIG. 2 is a front view of the same before adjustment.

FIG. 3 is a front view after the above-mentioned adjustment.

FIG. 4 is a plan view of a skew adjustment mechanism of the optical disk drive according to the second embodiment of the present invention.

FIG. 5 is a plan view of a skew adjustment mechanism of an optical disk drive according to a third embodiment of the present invention.

FIG. 6 is a front view before adjustment of a skew adjustment mechanism of a conventional optical disc drive device.

FIG. 7 is a front view after the above-mentioned adjustment.

[Explanation of symbols]

α, β1, β2, β3 Skew adjustment mechanism of optical disk drive D optical disk recording medium L laser beam P optical pickup unit 2 spindle motor 3 turntable 4 guide rail 5 optical pickup mounting unit 6 pinion gear 7 skew adjustment motor 101 mechanical chassis 102 Spindle motor 103 Turntable 104 Spring 105 Movable bearing 106 Fixed bearing 107 Skew adjustment arm 108 Cam 109 Skew adjustment motor 110 Fixing screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-123323 (JP, A) JP-A-7-262569 (JP, A) JP-A-8-17135 (JP, A) JP-A-63-1988 71941 (JP, A) JP-A-3-37829 (JP, A) JP-A-9-120624 (JP, A) JP-A-64-31552 (JP, U) JP-A-1-154558 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B ⁷ /08-7/10 G11B 19/20-19/28

Claims (3)

(57) [Claims] A spring formed with one end locked by a holding piece protrudingly formed on the upper surface of the mechanical chassis and the other end pressed against the spindle motor drive shaft on the opening of the mechanical chassis to be urged. A movable bearing that abuts the other end of the spring and pivotally supports the drive shaft at the mechanical chassis opening so as to be movable in a direction parallel to a recording / reproducing surface of the optical disc recording medium; and a movable bearing provided at the other end of the drive shaft. A fixed bearing serving as a swing center for pivotally supporting the drive shaft; a skew adjustment arm having one end pivotally supported by the pivot and the other end abutting on the movable bearing; and a skew adjustment arm free end contacting the free end. A skew adjustment mechanism for an optical disk drive, comprising: a cam pivotally supported by a pivot. 2. The skew adjustment mechanism according to claim 1, wherein the cam is driven by a motor. 3. The skew adjustment mechanism for an optical disk drive according to claim 1, wherein the skew adjustment arm includes a fixing screw for maintaining the adjustment state by screwing and fixing to the mechanical chassis.