JP2003187463A - Disc recording and reproducing device provided with pickup slant adjustment mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent slant errors of a pickup caused by impacts. <P>SOLUTION: The adjustment mechanism 6 to adjust the slant of a pickup 3 has a support bracket 4 which has an adjustment screw 60 inserted to support the guide 30 touching the chassis at a point or line, and a pressure bracket 5 which is attached to the chassis 1 to energize the support 4 downward. The contact point P1 of the pressure bracket 5 and the support bracket 4 is positioned apart by the distance C from the contact point of the chassis 1 and the support bracket 4. The support bracket 4 is energized in the same direction as the spring by the moment M which the pressure bracket 5 exerts on the support bracket 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording or reproducing apparatus having a pickup tilt adjusting mechanism.

[0002]

2. Description of the Related Art FIG. 7 is a rear view of a conventional disc recording or reproducing apparatus, and FIG.
162115). Disk on chassis (1)
A turntable (2) for rotating (7) and a pickup (3) for irradiating a beam from an objective lens (36) provided so as to be able to approach and separate from the turntable (2) are provided.
The pickup (3) is mounted on the chassis (1) on the guide shaft (30) (3
You will be guided to move along 1). A gear train (15) and a worm (16) connected to the motor (M1) are provided on the chassis (1), and a screw shaft (17) is coaxially provided on the worm (16). FIG. 9 is a view of FIG. 7 viewed from the direction A. The pickup (3) is provided with a rack (38) via a mounting plate (37), and the rack (38) is a screw shaft (17). Fit from above. When the motor (M1) rotates, the screw shaft (17) rotates and the pickup (3) moves.

FIG. 10 is a rear view of the disk (7).
The signal surface of the disk (7) is provided with a plurality of pits (73) (73) recessed along the circumferential direction. When the pit (73) is irradiated with laser light and when the pits (73) are not included, The intensity of the reflected light differs when the laser light is applied to the location. This allows
A digital signal consisting of 0 and 1 is reproduced. Further, without forming the pits (73) on the signal surface of the disk (7), a magnetic surface having S poles and N poles is formed, the magnetic surface is irradiated with laser light, and the digital light is reflected in the diffraction direction of reflected light. Some regenerate the signal. In recent years, discs (7) on which signals are recorded at high density are commercially available. In such discs, pits (73)
The distance H of (73) or the distance of the magnetic surface is narrow. For this reason,
If the optical axis of the laser light is tilted with respect to the signal surface of the disk 7, the pits 73 or the magnetic surface at the wrong position may be irradiated and the signal may not be reproduced correctly. So the chassis
There is a disk recording or reproducing apparatus in which a mechanism for adjusting the inclination of the pickup (3) is provided on (1) and the signal surface of the disk (7) and the optical axis of laser light are substantially orthogonal to each other.

FIG. 11 is a sectional view of a conventional tilt adjusting mechanism (6) (see Japanese Patent Laid-Open No. 2001-52345). Chassis
A box body (65) covering the guide shaft (30) is screwed on (1), and the guide shaft (30) is pushed downward by a compression spring (61) in the box body (65). From below the chassis (1), adjust screw (6
(0) is screwed and the adjusting screw (60) is rotated, the guide shaft
The end of (30) moves up and down, and the inclination of the guide shaft (30) changes. As a result, the tilt of the pickup (3) changes in a plane that includes the moving direction of the pickup (3) and is orthogonal to the chassis (1).

[0005]

The amount of tilting of the pickup (3) during adjustment is very small. Therefore, if the tilt adjustment amount of the pickup (3) deviates when a shock or vibration is applied to the device after the tilt adjustment of the pickup (3), the signal may not be reproduced correctly. As a countermeasure against this, it is conceivable that the pressing force of the compression spring (61) in FIG. 11 is strengthened and the guide shaft (30) is strongly pressed against the adjustment screw (60) to prevent the tilt adjustment amount from shifting. However, in this case, the force for propelling the adjusting screw (60) against the compression spring (61) becomes large, and the workability of attaching the adjusting screw (60) deteriorates. An object of the present invention is to prevent the tilt adjustment amount of the pickup from shifting due to impact or the like.

[0006]

[Means for Solving the Problems] An adjusting mechanism (6) for adjusting the inclination of a pickup (3) supports a guide shaft (30) and makes a point contact or a line contact with a chassis (1), and an adjusting screw (60). ) Is fitted to the holding bracket (4), and the holding bracket (4) is attached to the chassis (1) and includes a pressing bracket (5) for urging the holding bracket (4) downward.
The contact point P1 of (4) is the chassis (1) and the holding bracket (4).
The holding bracket (4) is displaced by the contact point P2 of the above and the distance C along the guide shaft (30), and the moment M given to the holding bracket (4) by the pressing bracket (5) causes
It is biased in the same direction as the spring body.

[0007]

[Operation and effect] The pressing bracket (5) is a holding bracket
Holding bracket by moment M given to (4)
(4) is biased in the same direction as the spring body. This allows
A force to assist the spring body is applied to the holding bracket (4),
The holding bracket (4) is pressed against the adjusting screw (60) with a strong force, so that the pickup (3) will not be affected even if a shock is applied to the device.
It is possible to prevent the inclination adjustment amount from being deviated. Also, after attaching the holding bracket (4), adjustment screw (60) and spring body,
If the pressing bracket (5) is attached, the workability of attaching the adjusting screw (60) will not deteriorate.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An example of the present invention will be described in detail below with reference to the drawings. The apparatus according to this example is assumed to be a recording / reproducing apparatus for a magneto-optical disk, but may be an apparatus for recording / reproducing another disk such as a DVD. FIG. 1 is a perspective view of the chassis (1) seen from the back side, and FIG. 2 is a rear view of the same. The plan view of the device is similar to FIG. The pickup (3) has one guide shaft (31) called a counter shaft.
And is guided mainly by the other guide shaft (30).
A screw portion (32) is formed on the other guide shaft (30), and the guide shaft (30) is connected to the motor (M1). In this example, one of the guide shafts (30) also serves as the conventional screw shaft (17), thereby achieving downsizing of the device. Also,
Since the guide shaft (30) is directly driven by the motor (M1),
The mechanism for moving the pickup (3) is simplified, and noise is reduced because the gear train (15) and the worm (16) as in the prior art are not provided.

The guide shaft (30) and the motor (M1) are the chassis
(1) It is supported by a holding bracket (4) provided above. The holding bracket (4) is formed by bending a metal plate,
A substantially flat plate (40) parallel to the surface of the chassis (1), vertical plates (41) (41) protruding from both ends of the flat plate (40) for receiving the guide shaft (30) and the motor (M1), and the left side The vertical plate (41) has a horizontal plate (42) projecting outward from the upper end of the vertical plate (41). The adjusting screw (60) is fitted to the horizontal plate (42), and the lower end of the adjusting screw (60) is the chassis (1).
Screw into. The holding bracket (4) is covered with a metal pressing bracket (5), and the pressing bracket (5) is a chassis.
Attached to (1), as described below, holding bracket
Press (4) downward. This allows the retaining bracket (4)
Are positioned in the height direction.

As shown in FIG. 2, the holding bracket (4) has a hole (43) formed in the flat plate (40) and a long hole (44) in the chassis.
(1) Fitted on the upper protruding shaft (11) (11), the left and right front and rear are positioned. At the upper end of the pressure bracket (5), the receiving piece (5
1) is provided, and the receiving piece (51) covers the pickup (3) and is picked up when shock or vibration is applied to the device.
Upon receiving (3), the pickup (3) is protected. That is, since the pickup (3) is fitted on the guide shafts (30) (31), if shock or vibration is applied to the device, the guide shafts (30) (31)
There is a possibility that the optical components inside the pickup (3) may be damaged due to the bending of the pickup. Therefore, the receiving piece (51) receives the pickup (3). The pickup (3) has
An opening (33) for exposing the screw portion (32) of the guide shaft (30) is provided, and a spring plate (34) is attached to the peripheral portion of the opening (33). In FIG. 1, the spring plate 34 is not shown for convenience of illustration. FIG. 3 is a cross-sectional view of FIG. 2 viewed from the A direction.
The spring plate (34) is provided with a projecting piece (35) at its tip, and the projecting piece (35) enters the opening (33) and fits into the screw part (32). This allows
When the motor (M1) rotates, the guide shaft (30) also rotates, and the pickup (3) passes through the projecting piece (35) fitted in the screw part (32).
Moves.

(Details of Tilt Adjusting Mechanism) FIGS. 4 (a) and 4 (b) are views of FIG. 2 seen from the direction B, in which the pressing bracket (5) is partially broken. The chassis (1) is provided with a first protrusion (10) with its bulge facing upward, and the holding bracket (4) is placed on the top of the first protrusion (10). A second protrusion (50) is provided from the lower surface of the pressing bracket (5), and the second protrusion (50) is
Make a point or line contact with the retaining bracket (4). The contact point P1 between the pressing bracket (5) and the holding bracket (4) is the contact point P2 between the chassis (1) and the holding bracket (4), and the guide shaft (3
It is provided by shifting the distance C to the right along 0). That is, the contact P1 is farther from the adjusting screw (60) than the contact P2. Adjusting screw (60) between horizontal plate (42) and chassis (1)
A compression spring (61) is fitted in the holding bracket (4), and the holding bracket (4) is pressed upward by the adjusting spring (61). The holding bracket (4), the adjusting screw (60), and the compression spring (61) constitute the tilt adjusting mechanism (6) of the pickup (3). In this example, the tilt adjusting mechanism (6) is provided only on one guide shaft (30), but it may be provided on both guide shafts (30) and (31).

The pressing bracket (5) pushes the holding bracket (4) downward by the second protrusion (50). Since the contact point P1 and the contact point P2 are displaced by the distance C, a clockwise moment M obtained by multiplying the pressing force by the distance C is applied to the holding bracket (4) as shown in FIG. 4 (a). The moment M applies a force for urging the horizontal plate (42) to the head of the adjusting screw (60). That is, a force that assists the compression spring (61) works. The holding bracket (4) is a force obtained by adding the force due to the moment of the pressure bracket (5) to the biasing force of the compression spring (61),
Since it is pressed by the (60), the tilt adjustment amount of the pickup (3) is prevented from shifting even if a shock or the like is applied to the device. In particular, as shown in FIG. 4 (b), when the adjusting screw (60) is raised and the compression spring (61) is extended to decrease the biasing force,
This mechanism is effective. Further, if the pressing bracket (5) is attached after the holding bracket (4), the adjusting screw (60) and the compression spring (61) are attached, the workability of attaching the adjusting screw (60) is not deteriorated.

In the above example, the first protrusion (10) is attached to the chassis (1).
Although it is provided, the holding bracket (4) may be provided. Further, although the second protrusion (50) is provided on the pressing bracket (5), it may be provided on the holding bracket (4). Also,
The holding bracket 4 and the pressing bracket 5 may be made of a material other than a metal plate, for example, synthetic resin. Furthermore, instead of the compression spring (61), a tension spring may be used to urge downward. In this case, the positions of the contacts P1 and P2 are opposite to the above. Further, the pickup (3) is provided with a magnetic head lever for recording, but the description thereof is omitted for convenience of explanation.

FIG. 5 is a rear view showing another tilt adjusting mechanism (6), and FIG. 6 is a view of FIG. 5 viewed from the B direction. In this example, the holding bracket (4) is bent downward to form the sandwiching pieces (45) (45), and the first piece of the chassis (1) is sandwiched between the sandwiching pieces (45) (45). The protrusion (10) fits. As a result, the holding bracket (4) is positioned in the left-right direction and the height direction. Also, the protruding shaft (11) of the chassis (1) is
It fits in the long hole (44) of (4) and is positioned front and back. The left edge of the chassis (1) has been bent and the retention bracket
A horizontal plate (42) is formed to cover the left end of (4), and the horizontal plate (4)
The adjusting screw (60) is screwed into 2). The lower end of the adjustment screw (60)
The holding bracket (4) is in contact with the holding bracket (4), and the holding bracket (4) is biased upward by a leaf spring (12) on the chassis (1). A torsion spring (not shown) may be used instead of the leaf spring (12). Even in this example, the contact point P1 between the pressing bracket (5) and the holding bracket (4) is the same as that of the chassis (1) and the holding bracket.
The contact P2 of (4) and the contact P2 are provided along the guide shaft (30) with a distance C shifted to the right. A clockwise moment M obtained by multiplying the pressing force of the pressing bracket (5) by the distance C is applied to the holding bracket (4). The moment M causes the compression spring (6
1) The power to assist is working. This prevents the tilt adjustment amount of the pickup (3) from shifting even if a shock or the like is applied to the device.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a perspective view of a chassis as viewed from the back.

FIG. 2 is a rear view of the above.

FIG. 3 is a cross-sectional view of FIG. 2 viewed from the direction A.

FIG. 4 is a view of FIG. 2 viewed from a B direction.

FIG. 5 is a back view showing another tilt adjusting mechanism.

FIG. 6 is a view of FIG. 5 viewed from the B direction.

FIG. 7 is a rear view of a conventional disc recording or reproducing device.

FIG. 8 is a plan view of the above.

9 is a view of FIG. 7 viewed from the direction A. FIG.

FIG. 10 is a rear view of the disc.

FIG. 11 is a cross-sectional view of a conventional tilt adjusting mechanism.

[Explanation of symbols]

(1) Chassis (2) Turntable (3) Pickup (4) Holding bracket (5) Press bracket (6) Tilt adjustment mechanism (30) Guide shaft (32) Screw part (60) Adjustment screw

Claims (3)

[Claims] 1. A turntable (2) for rotating a disk (7) and a turntable (2) provided on the chassis (1) so as to be able to approach and separate from the turntable (2), and a laser beam is provided on a signal surface of the disk (7). Pickup that emits (3) and the pickup
A guide shaft (30) for guiding the movement of (3), and the guide shaft (30)
Is provided with an adjusting mechanism (6) for inclining the guide shaft (30) with respect to the signal surface of the disk (7). The adjusting mechanism (6) urges the guide shaft (30) upward or downward and a spring body against the spring body. In a disc recording or reproducing apparatus having an adjusting screw (60) for moving the guide shaft (30), the adjusting mechanism (6) supports the guide shaft (30) and supports the chassis (1).
A holding bracket (4) which is in point or line contact with the adjustment screw (60), and a pressing bracket (5) which is attached to the chassis (1) and biases the holding bracket (4) downward. , Contact point P1 between pressing bracket (5) and holding bracket (4)
Is the contact point P2 between the chassis (1) and the holding bracket (4),
The holding bracket (4) is provided along the guide shaft (30) by a distance C, and the holding bracket (4) is biased in the same direction as the spring body by a moment M given to the holding bracket (4) by the pressing bracket (5). A disk recording or reproducing device characterized by the above. 2. The pressing bracket (5) has a pickup.
A receiving piece (51) for receiving and protecting (3) is provided.
A disc recording or reproducing apparatus according to item 1. 3. The disk according to claim 1, wherein the guide shaft (30) is formed with a screw portion (32), and the pickup (3) is fitted in the screw portion (32) to guide the movement. Recording or playback device.