JP2002230923A - Disk recorder or reproducer provided with pickup inclination adjusting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly position a pickup inclination adjusting mechanism on a chassis, to prevent a guide shaft from unexpectedly shaken and moved on a surface in nearly parallel with the chassis and to improve the resistance against an impact due to falling, etc., in a disk recorder or reproducer. SOLUTION: The disk recorder or reproducer is provided with a pickup arranged on the chassis so as to be able to freely come close to and separable from concerning the center of a disk, the guide shaft which is extended in a pickup movement direction and to which the pickup is fitted and the adjusting mechanism for changing the inclination angle of the guide shaft on the surface which comprises the pickup movement direction and is orthogonally crossed with the upper surface of the chassis. The adjusting mechanism is provided with a bracket for holding the end part of the guide shaft, a compression spring for energizing the guide shaft and an adjustment screw for pushing in the guide shaft against the compression spring. The adhesive height of the compression spring is lower than an inclination adjustment range and also becomes the height by which the pickup is not brought into contact with the chassis when the guide shaft position is provided at the adhesive height. Besides, a gap is arranged between the bracket and the compression spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording or reproducing apparatus provided with a tilt adjusting mechanism for tilting a pickup with respect to a signal surface of a disk.

[0002]

2. Description of the Related Art FIG. 11 is a perspective view of a conventional disk recording or reproducing apparatus. As is well known, a turntable (13) on which a disk (7) is placed and a pickup (2) provided so as to be able to approach and separate from the turntable (13) are provided on the chassis (1). The pickup (2) has an objective lens (22) on the upper surface and two guide shafts (4) on the chassis (1).
You will be guided to (4). Both ends of each guide shaft (4)
Fits on brackets (9) (9) on chassis (1).

A motor (M) is provided on a side of the chassis (1), and the motor (M) is provided via a gear mechanism (21) on a rack (2) provided on a side of the pickup (2). Connect to 20). When power is supplied to the motor (M), each gear of the gear mechanism (21) rotates, and the pickup (2) moves.

FIG. 10 is a rear view of the disk (7).
A plurality of pits (73) (73) are recessed along the circumferential direction on the signal surface of the disk (7), and when the pit (73) is irradiated with a laser beam, The intensity of the reflected light is different from when a laser beam is applied to the location. This gives 0
And 1 is reproduced.

In recent years, there has been a disk (7) on which signals are recorded at a high density. In this disk, the interval D between the pits (73) and (73) in the disk radial direction shown in FIG. 10 is narrow.

Therefore, the optical axis of the laser light is
If the signal is slightly inclined with respect to the signal surface, the pit (73) at the wrong position may be irradiated, and the signal may not be reproduced correctly.

Therefore, a pickup is mounted on the chassis (1).
It is proposed to provide a mechanism to adjust the tilt of (2), and to finely adjust the tilt of the pickup (2) in the process of manufacturing a disk recording or reproducing device, and to smoothly reproduce a high-density recorded disk. Have been.

FIG. 11 is a side sectional view of the adjusting mechanism (5). A bracket (9) provided with a recess (90) into which one end of the guide shaft (4) fits is mounted on the chassis (1), and the bracket (9) is a stopper screw screwed into the chassis (1). Installed by (30).

A compression spring (50) for urging the guide shaft (4) upward is provided in the concave portion (90), and the guide shaft (50) is provided on the bracket (9) against the compression spring (50). An adjusting screw (6) for pushing in 4) is screwed. When the adjusting screw (6) is turned, the end of the guide shaft (4) goes up and down, so that the guide shaft (4) is inclined in a plane including the moving direction of the pickup (2) and orthogonal to the chassis (1). . Thereby, the inclination of the pickup (2) can be finely adjusted.

[0010]

Conventionally, when the bracket (9) is fixed to the chassis (1) with screws (30), the bracket (9) is in a plane parallel to the chassis (1), that is, There is a risk of swinging movement in a horizontal plane. In this case, even though the inclination of the pickup (2) can be adjusted accurately, there is a possibility that the guide shaft (4) swings and moves in a horizontal plane.
Cannot move accurately toward the center of the disc.

The guide shaft (4) is fitted in the recess (90), and there is a slight gap between the recess (90) and the guide shaft (4). Therefore, if the adjusting screw (6) does not accurately push the guide shaft (4) downward, the guide shaft (4) may swing in the gap.

SUMMARY OF THE INVENTION It is an object of the present invention to accurately position a tilt adjusting mechanism of a pickup on a chassis, to prevent a guide shaft from inadvertently swinging and moving in a plane substantially parallel to the chassis, and to prevent a device from dropping. The purpose is to make it more resistant to the impact of

[0013]

In order to solve the above-mentioned problems, the present invention provides a pickup (2) provided on a chassis (1) so as to be able to approach and separate from the center of a disk (7); A guide shaft (4) that extends in the movement direction of (2) and in which the pickup (2) is fitted; and a tilt of the guide shaft (4) in a plane that includes the movement direction of the pickup (2) and is orthogonal to the upper surface of the chassis (1). An adjusting mechanism (5) for changing the angle is provided, and the adjusting mechanism (5) is provided.
Is a bracket (9) for holding the end of the guide shaft (4), a compression spring (50) for urging the guide shaft (4),
In a disc recording or reproducing apparatus provided with an adjusting screw (6) for pushing the guide shaft (4) against the (50), the compression spring
The contact height of (50) is lower than the inclination adjustment range, and when the position of the guide shaft (4) is the contact height, the pickup (2) and the chassis (1) are at a height that does not make contact. .

A gap is provided between the bracket (9) and the compression spring (50).

The adjusting mechanism (5) is a first positioning mechanism (3) for determining the position of the bracket (9) on the chassis (1).
And the position of the adjusting screw (6) in a plane substantially parallel to the surface of the chassis (1), and the second positioning for accurately directing the traveling direction of the adjusting screw (6) to the center C of the guide shaft (4). A mechanism (8) is provided.

[0016]

[Operation and Effect] Since the bracket (9) is mounted at a precise position on the chassis (1) by the first positioning mechanism (3), the guide shaft (4) is positioned within a plane parallel to the chassis (1). There is no risk of swinging movement.

Further, the adjustment screw (6) is directed in the direction C toward the center C of the guide shaft (4) by the second positioning mechanism (8). The contact height of the compression spring (50) is lower than the tilt adjustment range, and the height at which the guide shaft (4) does not contact the pickup (2) and the chassis (1) at the position of the contact height. Therefore, at the time of tilt adjustment, the compression spring (50) is always sandwiched between the guide shaft (4) and the adjustment screw (6) by the pushing force of the spring, and faithfully reacts to the tightening rotation and loosening rotation of the adjustment screw (6). In addition, accurate tilt adjustment can be performed.

Further, when the guide shaft (4) stops at the position of the contact height H of the compression spring (50) at the time of dropping, when the guide shaft (4) moves from the adjustment position to the position of the contact height H by an impact, the compression spring (4) stops. After reaching the repulsive force of 50) and the contact height, the compression spring (50) shifts the acceleration, the deflection of the guide shaft (4) absorbs the shock, and the pickup (2) collides directly with the chassis (1). It is possible to reduce the impact by setting the acceleration to be extremely small as compared with the case.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of a disk recording or reproducing apparatus.

As in the conventional example, a turntable (13) for rotating a disk (7) is provided beside the opening (14) opened in the chassis (1), and a beam is applied to the disk (7). A pickup (2) having an objective lens (22) for emitting light is provided on the turntable (13) so as to be able to approach and separate therefrom.

The pickup (2) has brackets at both ends.
(9) It fits on the guide shafts (4) and (4) supported by (9), and originally moves on an imaginary line L connecting the centers of the lens (22) and the turntable (13).

On the side of the opening (14) on the chassis (1),
A motor (17) is provided, and the motor (17) is connected to the pickup (2) via an intermediate gear (15). When power is supplied to the motor (17), the pickup (2) moves.

The outer peripheral edge of the chassis (1) is bent upward to form upright walls (12), (12), and the upright wall (12) is provided outside the chassis (1) in a cabinet (not shown). ).

FIG. 2 is a side sectional view of the bracket 9 viewed from the direction A in FIG. Bracket (9) is chassis
(1) Chassis with stop screw (30) screwed from below
It is attached to (1). Guide shaft on bracket (9)
A recess (90) into which the end of (4) fits is provided, and a compression spring (50) for urging the guide shaft (4) upward is provided in the recess (90).

A receiving plate (80) covers the top surface of the bracket (9), and the receiving plate (80) is attached to the bracket (9) by a plate fixing screw (85). Adjustment screw on the receiving plate (80)
(6) is screwed, and the lower end of the adjusting screw (6) contacts the upper end of the guide shaft (4). The traveling direction of the adjusting screw (6) originally passes through the center C of the guide shaft (4).

FIG. 3 shows a bracket (9), a guide shaft (4),
FIG. 4 is an exploded perspective view of the receiving plate (80), with a part of the chassis (1) broken away. The chassis (1) has a through hole (10) into which a part of the bracket (9) fits, and a tongue piece (91) that fits into the through hole (10) projects from the bracket (9). I have. Tongue piece (9
In (1), the upper surface is located in the same plane as the upper surface of the chassis (1), that is, the tongue piece (91) is provided below the guide shaft (4).
The tongue piece (91) is formed in an arc shape, and the horizontal position of the bracket (9) on the chassis (1) surface is determined by contacting the edge (11) of the through hole (10).

The concave portion (90) has a guide portion (93) formed to have a width in which the guide shaft (4) fits with a margin, and a compression spring (5).
(0) fits into the storage section formed to be larger than the guide section (93)
(94) are provided in a row. A gap is provided between the storage part (94) and the compression spring (50).

On the upper surface of the bracket (9), positioning projections (92) and (92a) that fit into the receiving plate (80) project, and plate fixing screws (92) and (92a) are provided beside the positioning projections (92) and (92a). A screw hole (82) into which the screw (85) is screwed is provided.

The receiving plate (80) has positioning protrusions (92) (92a).
The notches (81) and (81) that fit into the notches (81) and (81) are opened, and on both sides of the notches (81) and (81), A through hole (83) through which the plate fixing screw (85) passes is opened.

Attachment of Bracket (First Positioning Mechanism) To attach the bracket (9) to the chassis (1), the following procedure is performed.

FIG. 4 is a rear view of the chassis (1). First, the chassis (1) is turned over, and the bracket (9) is inserted into the through hole (10) from below the chassis (1). Tongue piece (91) is through hole
With the bracket (9) fitted, the bracket (9) is fixed with a jig (98) to restrict the rotation of the bracket (9) in the horizontal plane.

The stop screw (30) is screwed into the bracket (9) through the chassis (1). Since the stop screw (30) rotates clockwise with the tightening, when the head of the stop screw (30) is in contact with the chassis (1), the chassis (1) stops the stop screw (30).
Rotates clockwise due to friction with the head of the. Through hole (10)
Edge (11) of the tongue (91)
(9) is positioned on the chassis (1). Since the tongue piece (91) is formed in an arc shape, the tongue piece (91) must be an edge (11)
It contacts and is positioned at one point above. That is, the tongue piece (91) and the edge (11) of the bracket (9) constitute the first positioning mechanism (3). At the same time that the bracket (9) is fastened with the set screw (30), the chassis (1) of the bracket (9)
Since the upper position is determined, the trouble of positioning can be saved. (Second Positioning Mechanism) Next, as shown in FIG. 3, the chassis (1) is turned upside down, and the receiving plate (80) is mounted on the bracket (9) in which the compression spring (50) and the guide shaft (4) are inserted. )
Pass the plate fixing screw (85) through the (83) into the screw hole of the bracket (9).
(82). The plate stopper screw (85) rotates clockwise with tightening, and the head of the plate stopper screw (85) is attached to the receiving plate (80).
, The receiving plate (80) rotates clockwise due to friction with the head of the plate stopper screw (85).

FIG. 5 is a plan view of the receiving plate (80), but the notch (81) on the clockwise side of the receiving plate (80) has the positioning protrusion (92).
, Whereby the receiving plate (80) is positioned in a plane parallel to the surface of the chassis (1). That is, the second positioning mechanism is formed by the notch (81) of the positioning projection (92) and the receiving plate (80).
Construct (8). At the same time that the receiving plate (80) is fastened with the plate fixing screw (85), the position of the receiving plate (80) in the plane substantially parallel to the chassis (1) is determined. .

When the adjusting screw (6) is turned after the bracket (9) is attached, the guide shaft (4) is picked up.
The tilt is adjusted in a plane including the moving direction of (2) and orthogonal to the chassis (1).

FIG. 6 is a sectional view of FIG. 3 taken along a plane including the line CC. By positioning the receiving plate (80) in a plane parallel to the surface of the chassis (1), the traveling direction of the adjusting screw (6) is directed to the center C of the guide shaft (4).

If the receiving plate (80) is not accurately positioned in a plane parallel to the surface of the chassis (1), the traveling direction of the adjusting screw (6) is changed to the guide shaft as shown by a dashed line in FIG. (4)
Deviates from the center C of As described above, the guide portion (9
Although there is a slight gap between the guide shaft (3) and the guide shaft (4), when the traveling direction of the adjusting screw (6) is shifted from the center C of the guide shaft (4), the adjusting screw (6) becomes the guide shaft ( Since the eccentric part 4) is pressed, the guide shaft 4 oscillates in the gap in a direction orthogonal to the direction along the guide shaft 4.

Since the pickup (2) moves along the guide shaft (4), the transition path of the pickup (2) shifts from an imaginary line L facing the center of the disk as shown in FIG. Therefore, the traveling direction of the adjusting screw (6) is
The guide shaft (4) is oriented correctly to the center C of (4) and the guide portion (93)
Within the guide shaft (4).

FIG. 7 is a sectional view when a compression spring having a high contact height H is used, and FIG. 8 is a view using a compression spring having a low contact height H.

As a method of increasing the contact height of the compression spring (50), the number of end turns of the compression spring (50) is increased.
Further, the compression spring (50) shown in FIG. 7 has a small winding diameter so as to provide a clearance in the storage portion (94) of the bracket (9).

When the contact height H of the compression spring (50) is lower than the desired inclination adjustment range, and when the guide shaft (4) is at the contact height position, the pickup (2) is moved to the chassis. The height shall be such that it does not contact (1).

The desired tilt adjustment range is a range in which the mounting error of the pickup (2) and the distortion of the chassis (1) are absorbed, and the pickup (2) can be mounted on the disk surface with a predetermined accuracy.

Thus, when the inclination is adjusted, the compression spring (50) is always sandwiched between the guide shaft (4) and the adjustment screw (6) by the pushing force of the spring, and the adjustment screw (6) is tightened and rotated. And the tilt can be adjusted accurately.

After the inclination is adjusted, the adjusting screw (6) is screw-locked with an adhesive so that the adjusting screw (6) does not rotate spontaneously and does not loosen. Is added, the height of the guide shaft (4) does not change, and the tilt adjustment angle is accurately maintained, so that the tilt angle of the pickup does not change.

Further, when the apparatus receives an impact due to a drop or the like, the following is effected.

For example, when the user accidentally drops the apparatus from the desk on the floor, an acceleration of up to 100 G is applied, and depending on the direction of the fall, the pickup (2) may hit the chassis (1). Occurs.

Since the pickup (2) is a high-precision optical system in which many small parts are assembled, the optical system is vulnerable to impact. If a collision occurs with the chassis (1) at 100G, the optical system is distorted, and normal recording and reproduction can be performed. become unable.

In the present apparatus, when dropped, the guide shaft (4) stops at the position of the contact height H of the compression spring (50).

When moving from the adjustment position to the contact height H due to the impact, the repulsive force of the compression spring (50)
The storage part of the bracket (9) after reaching the close contact height
The acceleration is reduced by the displacement of the compression spring (50) in (94), and the shock is absorbed by the deflection of the guide shaft (4).

As a result, the acceleration can be made extremely small as compared with the case where the pickup (2) collides directly with the chassis (1), and the impact can be reduced.

Further, such a device is desired to be downsized. In particular, an upright wall (12) of a chassis (1) stands upright in the vicinity of a bracket (9) on the outer peripheral side of the disk. bracket
To position (9), use the bracket (9) with the guide shaft.
The first positioning mechanism (3) is provided as described above, although it may be lengthened in the direction along (4), which is contrary to miniaturization of the apparatus. As a result, the size of the device is reduced.

Since the upper surface of the tongue piece (91) constituting the first positioning mechanism (3) is located in the same plane as the upper surface of the chassis (1), the tongue piece (91) is positioned on the pickup (2). Deployed below the transition path. Thus, even if the first positioning mechanism (3) is provided, the entire device does not become thick.

In this example, the guide shaft (4) is urged upward by the compression spring (50), and the guide shaft (4) is adjusted by the adjusting screw (6).
(4) is to be pressed downward. Instead, the guide shaft (4) is urged downward by the compression spring (50), and the adjusting screw is
(6) is screwed from below the chassis (1), and the adjusting screw
In (6), the guide shaft (4) may be pushed upward.

As described above, according to the present invention, the compression spring (50)
Can use both the tilt adjustment mechanism and the protection function against dropping of the device, so that it is possible to provide a high performance digital camera resistant to impact and a magneto-optical disk device for other mobile devices.

[Brief description of the drawings]

FIG. 1 is a plan view of a disk recording or reproducing apparatus.

FIG. 2 is a side sectional view of the bracket as viewed from a direction A in FIG. 1;

FIG. 3 is an exploded perspective view of a bracket, a guide shaft, and a receiving plate.

FIG. 4 is a rear view of the chassis.

FIG. 5 is a plan view of a receiving plate.

FIG. 6 is a cross-sectional view of FIG. 3 cut in a plane including a line CC.

FIG. 7 is a cross-sectional view when a compression spring having a high contact height is used.

FIG. 8 is a sectional view when a compression spring having a low contact height is used.

FIG. 9 is a perspective view of a disk recording or reproducing apparatus.

FIG. 10 is a rear view of the disk.

FIG. 11 is a side sectional view of the adjustment mechanism.

[Explanation of symbols]

 (1) Chassis (2) Pickup (3) First positioning mechanism (4) Guide shaft (5) Adjusting mechanism (6) Adjusting screw (7) Disk (8) Second positioning mechanism (9) Bracket (10) Through-hole (11) Edge (50) Compression spring (80) Receiving plate (92) Positioning protrusion (94) Storage section

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D068 AA02 BB01 CC02 EE01 EE17 GG06 5D117 AA02 CC07 JJ15 JJ19 KK08 KK10 KK22

Claims (3)

[Claims] 1. A pickup (2) provided on a chassis (1) so as to be able to approach and separate from the center of a disc (7), and a guide extending in the moving direction of the pickup (2) and fitting with the pickup (2). A guide shaft (4) in a plane perpendicular to the upper surface of the chassis (1) including the movement direction of the shaft (4) and the pickup (2).
An adjusting mechanism (5) for changing the inclination angle of the
(5) is a bracket (9) for holding the end of the guide shaft (4).
A compression spring (50) for urging the guide shaft (4); and an adjusting screw for pushing the guide shaft (4) against the compression spring (50).
(6) In the disk recording or reproducing apparatus provided with (6), the contact height of the compression spring (50) is lower than the inclination adjustment range, and the position of the guide shaft (4) is the contact height. A disc recording / reproducing apparatus, wherein the pickup (2) and the chassis (1) have a height that does not make contact with each other. 2. The bracket (9) and the compression spring (50).
2. The disc recording or reproducing apparatus according to claim 1, wherein a gap is provided between the discs. 3. A first positioning mechanism (3) for positioning a bracket (9) on a chassis (1).
And the position of the adjusting screw (6) in a plane substantially parallel to the surface of the chassis (1), and the second positioning for accurately directing the traveling direction of the adjusting screw (6) to the center C of the guide shaft (4). 3. The disc recording or reproducing apparatus according to claim 1, further comprising a mechanism.