JP2002042431A - Disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk player which is capable of regulating the angle of irradiation with a laser beam simply by rotating guide shafts in one direction without rotating members, such as screws, forward and backward. SOLUTION: This disk player 30 includes an optical pickup 38, a mechanical chassis 32 which is mounted with a spindle motor for rotating a turn table 34 to be loaded with an optical disk 31 and the two guide shafts 40 and 42 which are disposed at the mechanical chassis 32 in parallel to each other and freely slidably supports the optical pickup 38. Of the respective guide shafts 40 and 42, the one guide shaft 40 has the outer peripheral surface formed in a cam surface and is provided rotatably around its axis as the center. The optical pickup 38 is disposed so that the cam surface of the one guide shaft 40 in such a manner that the one guide shaft 40 side moves vertically around the other guide shaft 42 while matching with the cam surface of the guide shaft 40 by rotating the one guide shaft 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD, a CD-R,
The present invention relates to a disc player that reproduces information and / or records information on an optical disc such as a CD-RW and a DVD.

[0002]

2. Description of the Related Art In a disk player capable of recording data on an optical disk such as a CD-R or a CD-RW, it is necessary to maintain the intensity of a laser beam applied to the optical disk at a certain level or more. For this purpose, it is necessary to employ an optical pickup having a large output of laser light and to mount the optical pickup so that the irradiation angle of the laser light of the optical pickup is substantially perpendicular to the optical disk. However, due to the accuracy of machining and the mounting accuracy, the parallelism between the turntable on which the optical disc is mounted and the mechanical chassis on which the optical pickup is slidably mounted tends to vary.

Therefore, conventionally, a disc player is provided with a tilt adjusting mechanism for a turntable, or a tilt adjusting mechanism for an optical pickup with respect to a mechanical chassis. Is irradiated at right angles to the laser beam. Hereinafter, an adjustment mechanism for adjusting the inclination of a turntable will be described with reference to FIG. 4 as a conventional mechanism for adjusting the incident angle of laser light to an optical disk. In this specification, the tracking direction refers to the radial direction of the optical disk on which the optical pickup moves, and the radial direction of the optical disk orthogonal to this direction is referred to as the tangential direction.

[0004] A mechanical chassis 11 which is a metal plate-like body on which an optical pickup (not shown) is mounted is mounted in the housing of the disc player.
1 is provided with a spindle motor 12 for rotating the optical disk. A turntable 16 for mounting an optical disk 18 is attached to an output shaft 14 of the spindle motor 12. This spindle motor 12
It is itself fixed to the mechanical chassis 11 via a mounting plate 19. The inclination of the turntable 16 is adjusted by adjusting the angle of attachment of the attachment plate 19 to the mechanical chassis 11.

The tilt adjusting mechanism will be described in more detail. The mounting plate 19 is provided to be supported by three fulcrums 20 and 21 (only two fulcrums are shown in FIG. 4) with respect to the mechanical chassis 11, and one of the three fulcrums is provided. By making the height of the other two fulcrum portions adjustable as reference points, the fulcrum can be inclined with respect to the mechanical chassis 11. In other words, the two fulcrum portions are inserted through the through holes 22 provided in the mounting plate 19, and a screw 24 whose tip is screwed into the screw hole 13 of the mechanical chassis 11, and the two fulcrum portions are externally fitted to the screw 24. A coil spring 26 is interposed between the mounting plate 19 and the mechanical chassis 11 and constantly urges the mounting plate 19 to abut on the seat surface of the head of the screw 24.

[0006] With this configuration, the screw 24 serving as adjusting means is provided.
Is screwed into the mechanical chassis 11, the mounting plate 19
4 is pushed by the head 24a to approach the mechanical chassis 11 side, and the gap between the mechanical chassis 11 and the mechanical chassis 11 is reduced. By turning the screw 24 in the opposite direction, the head 24a of the screw 24 moves away from the mechanical chassis 11 side. Since such a configuration has been adopted, the inclination of the turntable 16 in both the tracking direction and the tangential direction with respect to the mechanical chassis 11 can be adjusted.

The laser beam irradiation angle adjusting mechanism of the conventional disk player described above adjusts the angle of the turntable 16 with respect to the mechanical chassis 11. However, the angle of the optical pickup with respect to the mechanical chassis may be adjusted as described below (not shown). That is, since the optical pickup is supported by the two guide shafts so as to be freely movable in the tracking direction with respect to the optical disk, the two guide shafts are provided to be tiltable in the axial direction. It is.

[0008] At both ends of the guide shaft, shaft holders for attaching the guide shaft to the mechanical chassis are mounted. By providing both shaft holders so as to be able to move toward and away from the mechanical chassis, the guide shaft can be tilted in the axial direction, and the tilt in the tracking direction can be adjusted. By inclining both of the two guide shafts, the inclination in the tangential direction can be adjusted. The structure for mounting each shaft holder to the mechanical chassis can be the same as the structure for mounting the mounting plate to the mechanical chassis in the angle adjustment of the turntable as described above.

In other words, both ends of each shaft holder are attached to the mechanical chassis by screws. Coil springs for urging the heads of the screws in a direction away from the shaft holder are fitted to the screws. Have been. Therefore, turning the screw in the tightening direction moves the shaft holder closer to the mechanical chassis, and turning the screw in the loosening direction moves the shaft holder away from the mechanical chassis.

[0010]

In the disk player described above, the tilt of the turntable with respect to the mechanical chassis is adjusted by rotating the screw, or the mechanical chassis of the optical pickup is similarly rotated by rotating the screw. The inclination with respect to is adjusted. However, when adjusting the tilt by rotating the screw in this way, it is necessary to rotate the screw forward and reverse many times before narrowing it to the optimum position before setting it to the optimum position. Is normally performed manually because the machine cannot automatically perform the adjustment, and there is a problem that the adjustment cannot be automated. Also, between the screw and the mechanical chassis, a coil spring is mounted,
There is also a problem that the rotation of the optical disk may cause vibrations on the turntable or the optical pickup.

In addition, adjustment of the inclination in the tracking direction,
In the adjustment of the inclination in the tangential direction, a more severe adjustment is required for the inclination in the tangential direction. Therefore, it is necessary to accurately adjust the inclination in the tangential direction regardless of the tracking direction.

Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to rotate the guide shaft only in one direction without rotating members such as screws in the normal and reverse directions, and to adjust the laser beam irradiation angle. An object of the present invention is to provide a disk player which can be adjusted and can also prevent generation of vibration due to rotation of the optical disk.

[0013]

According to the disk player of the present invention, an optical pickup and a turntable for mounting an optical disk are mounted.
A mechanical chassis on which a spindle motor for rotating the turntable is mounted, and two mechanical chassis provided in parallel with each other along the tracking direction so as to slidably support the optical pickup in the tracking direction. And a guide shaft, wherein one of the guide shafts has an outer peripheral surface formed on a cam surface and is provided rotatably about an axis, and the optical pickup includes: By rotating one of the guide shafts, one guide shaft is provided so as to move up and down around the other guide shaft in accordance with the cam surface of the one guide shaft. By employing this configuration, by rotating the guide shaft having the outer peripheral surface formed on the cam surface, the optical pickup moves up and down around another guide shaft in accordance with the cam surface of the guide shaft. In other words, by rotating this cam-shaped guide shaft, the optical pickup is tilted in the tangential direction with respect to the mechanical chassis, and the laser beam irradiation angle can be adjusted. In addition to being easily adjustable, the adjustment can be automated. Further, since no coil spring is used, generation of vibration can be prevented as much as possible. In addition, there is no additional part or the like for adjusting the inclination, which can contribute to a reduction in the number of parts.

The guide shaft has a circular cross section and the rotation shaft is provided at an eccentric position.
The guide shaft can be manufactured at a lower cost than when the entire guide shaft is formed on an oval such as an ellipse or an oval, and the cost of the entire disc player can be reduced.

[0015]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an outline of the internal structure of the disk player, and FIG. 2 shows an outline of the mounting structure of the optical pickup of the disk player.
The disc player 30 of the present embodiment tilts the optical pickup only for adjusting the laser beam irradiation angle on the optical disc 31 in the tangential direction. In other words, the adjustment of the laser beam irradiation angle in the tracking direction may be of any structure,
In particular, a screw type as described in the related art may be used.

The mechanical chassis 32 is a metal plate-shaped member, and is fixed in a disk player housing (not shown). A turntable 34 for mounting the optical disk 31 is provided on the upper surface side of the mechanical chassis 32, and a spindle motor (not shown) connected to a rotation shaft of the turntable 34 to rotate the turntable 34 is provided on the mechanical chassis 32. 32 is fixed to the lower surface side. The mechanical chassis 32 has a hole 3
An optical pickup 38 (not shown in FIG. 1) is formed across the perforated portion 36 in the tracking direction.
Are provided (only one guide shaft is shown in FIG. 1).

The two guide shafts 40 and 42 are provided in parallel with each other along the tracking direction so that the optical pickup 38 can freely move along the tracking direction of the optical disk 31. One of the two guide shafts 40 and 42 is the main guide shaft, and the optical pickup 38 moves along the axis with the main guide shaft 42 interposed therebetween. The other guide shaft 40 is a sub guide shaft. The sub guide shaft 40 is provided to assist the movement of the main guide shaft 42 of the optical pickup 38.

At one end of the optical pickup 38 in the tangential direction, a guide hole 43 penetrating along the tracking direction is provided. The main guide shaft 42 is slidably inserted into the guide hole 43. Further, at the other end of the optical pickup 38 in the tangential direction, an insertion hole through which the sub-guide shaft 40 is inserted is not formed, and a U-shaped cross section that opens outward in the tangential direction is provided. Is formed. This guide part 45
Is formed in such a size that the auxiliary guide shaft 40 can rotate inside.

Reference numeral 46 denotes a shaft holder for holding an end of the sub guide shaft 40 for attaching the sub guide shaft 40 to the mechanical chassis 32 (not shown in FIG. 2). Although the shaft holder 46 is provided at only one end of the sub guide shaft 40 in FIG. 1, the shaft holder 46 having the same structure is naturally provided at both ends of the sub guide shaft 40. It should be noted that a shaft holder for attaching the main guide shaft 42 to the mechanical chassis 32 is also provided for the main guide shaft 42 which is omitted in FIG. The shaft holder 46 is molded of a synthetic resin or the like, and has an insertion hole 47 having a diameter into which each guide shaft can be inserted. The shaft holder 46 is attached and fixed to the mechanical chassis 32 by screws (not shown) interposed in the screw holes 48.

The auxiliary guide shaft 40 is a round bar as a whole and has a circular cross section.
Is provided at a position eccentric from the center of the cylinder, and is formed as a cam-shaped shaft. The rotation shaft 50 is provided so as to protrude from the end face 40 a of the sub-guide shaft 40. By rotating the sub-guide shaft 40 about the rotation shaft 50, the sub-guide shaft 40 is eccentric by the rotation of the eccentric shaft. Rotate. Accordingly, when changing the inclination of the laser beam irradiation angle in the tangential direction with respect to the optical disc, the sub guide shaft 40
By rotating the optical pickup 38 about a rotary shaft 50 provided at an eccentric position, the optical pickup 38 can be tilted up and down with respect to the tangential direction about the main guide shaft.

Further, as shown in FIG.
2, a side pressing plate 54 for pressing the other side surface of the middle part of the sub guide shaft 40 and a side pressing plate 52 for pressing one side surface are provided. In this manner, the sub guide shaft 40 is provided so that the side surfaces on one side and the other side in the tangential direction cannot be moved in the tangential direction by the side surface pressing plates 52 and 54.

FIG. 2 shows that the rotating shaft grounding surface C is formed on the mechanical chassis 32 so as to be in contact with the lower surface of the rotating shaft 50. In addition, the rotating shaft 50
A pressing surface C ′ is formed on the upper surface of the rotating shaft 50 so as to face the rotating shaft grounding surface C with the rotating shaft 50 interposed therebetween. As described above, the rotating shaft 50 is vertically sandwiched and held between the rotating shaft installation surface C and the pressing surface C ′. Specifically, the rotating shaft ground plane C is the bottom surface of the insertion hole of the shaft holder 46 shown in FIG. 1, and the pressing surface C 'is the top surface of the insertion hole of the shaft holder 46 shown in FIG.

As described above, the movement of the sub guide shaft 40 in the tangential direction (the left and right direction in the drawing) is restricted by the side pressing plates 52 and 54. Therefore, when the sub-guide shaft 40 provided with the rotary shaft 50 eccentrically rotates about the rotary shaft, the auxiliary guide shaft 40 does not move in the tangential direction (left and right direction in the drawing) but moves vertically by the amount of eccentricity. Become.

The rotation operation of the sub guide shaft will be described in more detail with reference to FIGS. 3 (a) to 3 (c). 3 (a) to 3 (c), not a series of operations in which the auxiliary guide shaft 40 rotates around the rotation shaft 50, but the rotation shaft 50 itself is provided so as to rotate around a predetermined axis. Is explained. In FIG. 3, a dashed line A is a horizontal line. FIG. 3B shows a state in which the optical pickup 38 is positioned horizontally with respect to the horizontal line A. On the other hand, FIG. 3A shows a state where the one end of the optical pickup 38 is positioned downward and tilted, and one end of the optical pickup 38 is positioned upward and tilted. FIG. 3 (c) shows the location where the error occurs.

Here, the horizontal line A is the mechanical chassis 32
, And the mechanical chassis is always held horizontally. Further, since the rotating shaft installation surface C on which the rotating shaft 50 is mounted is also provided on the mechanical chassis 32, it naturally keeps a position parallel to the mechanical chassis 32. Since the optical disk 31 is mounted on the mechanical chassis 32 as described above, the irradiation angle of the laser light on the optical disk 31 can be tilted by tilting the optical pickup 38 with respect to the mechanical chassis 32.

First, in FIG. 3A, the lower end of the rotating shaft 50 is in contact with the rotating shaft installation surface C, and the rotating shaft 50 is located above the end surface 40a of the sub guide shaft 40. is there. In the state of (a), the horizontal line A and
The optical pickup 38 is lower than the horizontal line A to the extent that the angle formed by the extension D of the bottom surface 45a of the guide portion 45 of the optical pickup 38 and the U-shaped cross section becomes the angle α. Therefore, the optical pickup 38 is
Is irradiated with laser light at an angle α with respect to.

From the state (a), the sub guide shaft 40 is rotated counterclockwise around the rotation shaft 50, and the rotation shaft 50 is also rotated about the center B of the end face 40a of the sub guide shaft 40. Rotate around B. Then, the lower end of the rotating shaft 50 is in contact with the rotating shaft installation surface C, and the rotating shaft 50 is located on the left side on the end surface 40 a of the sub guide shaft 40. At this time, the horizontal line A
And the extension line D of the bottom surface 45a of the guide portion 45 of the optical pickup 38 coincides with the extension line D. Therefore, this position (b)
In the figure, the optical pickup 38 is located at a position where the optical disk 31 is irradiated with the laser beam vertically.

The state shown in FIG.
And the rotation axis 50 is also rotated around the center B of the end surface 40a of the sub-guide shaft 40, and the state shown in FIG. In this state, the lower end of the rotating shaft 50 is in contact with the rotating shaft installation surface C, and the rotating shaft 50 is
0a. In this state,
The optical pickup 38 is elevated above the horizontal line A to the extent that the angle formed by the horizontal line A and the extension line D of the bottom surface 45a of the guide portion 45 of the optical pickup 38 having a U-shaped cross section becomes the angle β. Therefore, the optical pickup 38 emits the laser light at an angle β with respect to the optical disk 31.

In FIGS. 3A to 3C, the sub-guide shaft is rotated by 180 °. In FIGS. 3A and 3C, the optical pickup 38 is rotated in the tangential direction. Shows the largest inclination. Therefore, in the present embodiment, these (a) to
By rotating the sub-guide shaft 40 with (b) to (c), at least one proper position can be determined. Even if the rotation is not stopped at the proper position and the vehicle passes by, it is possible to further rotate the sub guide shaft 40 counterclockwise in the order of (c) to (b) to (a). The setting of the appropriate position can be performed again.

The rotation of the sub guide shaft 40 is performed by fitting a jig (not shown) such as a precision screwdriver to the end face of the rotary shaft 50. Therefore, the rotating shaft 5
It is necessary that a shape corresponding to the tip of the jig is formed on the end face of the jig.

In the above-described embodiment, the rotary shaft of the auxiliary guide shaft is provided at an eccentric position in the cross section of the guide shaft, and the outer peripheral surface is formed on the cam surface. However, the example in which the outer peripheral surface of the sub guide shaft is the cam surface is not limited to such a shape, and the cross section of the sub guide shaft may be simply formed in an oval shape. Even if the sub guide shaft adopting such a shape is rotated around the axis, the sub guide shaft side of the optical pickup moves up and down.
The tilt of the optical pickup can be adjusted according to the cam surface of the sub guide shaft.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the embodiments, and it is noted that many modifications can be made without departing from the spirit of the invention. Of course.

[0033]

According to the disk player of the present invention, an optical pickup, a mechanical chassis on which a turntable for mounting an optical disk is mounted and a spindle motor for rotating the turntable are mounted, and an optical pickup A disk player comprising two guide shafts provided on a mechanical chassis in parallel with each other along the tracking direction so as to slide freely in the tracking direction. The guide shaft has an outer peripheral surface formed on a cam surface and is provided rotatably about an axis. The optical pickup rotates one guide shaft to match the cam surface of one guide shaft. One guide shaft moves up and down around the other guide shaft It is provided to so that. With this configuration, by rotating the cam-shaped guide shaft, the optical pickup can be tilted in the tangential direction with respect to the mechanical chassis to adjust the laser beam irradiation angle. In this case, the adjustment is possible even if the guide shaft is always rotated in a fixed direction, and the adjustment can be easily performed. Can be planned. Further, since a coil spring is not used as the tilt adjusting mechanism, it is possible to prevent vibration from occurring as much as possible.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing the structure of a mechanical chassis portion of a disk player according to the present invention.

FIG. 2 is an explanatory diagram showing a structure of an optical pickup of the disk player according to the present invention.

FIG. 3 is a front view of the optical pickup for explaining the movement of the optical pickup when the inclination of the optical pickup is adjusted. (A) When the sub guide shaft side of the optical pickup is lowered. (B) When the optical pickup and the mechanical chassis are parallel. (C) When the sub guide shaft side of the optical pickup is raised.

FIG. 4 is an explanatory view showing a tilt adjusting mechanism of a conventional optical pickup.

[Explanation of symbols]

 Reference Signs List 30 Disc player 31 Optical disc 32 Mechanical chassis 34 Turntable 36 Perforated portion 40 Secondary guide shaft 42 Main guide shaft 43 Guide hole 45 Guide portion 46 Shaft holder 47 Insertion hole 48 Screw hole 50 Rotating shaft 52, 54 Side pressing plate

Claims (2)

[Claims] An optical pickup, a turntable for mounting an optical disk mounted thereon, and a mechanical chassis on which a spindle motor for rotating the turntable is mounted, and the optical pickup slidably supported in a tracking direction. As described above, in a disc player including two guide shafts provided on the mechanical chassis in parallel with each other along a tracking direction, one of the guide shafts is:
An outer peripheral surface is formed on the cam surface, and is provided so as to be rotatable about an axis. The optical pickup is configured to rotate the one guide shaft,
A disc player, wherein one guide shaft side is vertically moved about the other guide shaft in accordance with the cam surface of the one guide shaft. 2. The disc player according to claim 1, wherein the one guide shaft has a circular cross section, and a rotation shaft is provided at an eccentric position.