JP2556415Y2 - Disc player pickup support mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention mounts a disk on which a digital signal such as music or video is converted into a digital signal and records it by a method such as light, magneto-optics or static electricity on a turntable, and records information on the disk by a pickup or writes data on the disk. The present invention relates to a disc player for reproducing recorded information, and more particularly to a mechanism for adjusting a relative position between the disc and a pickup.

[0002]

2. Description of the Related Art In an optical disc player, the disc recording surface and the optical axis of the pickup must be perpendicular to each other. If the angle is shifted, the optical axis becomes an elliptical focal point on the disc recording surface, Reads the pits of an adjacent track. For this reason, striped noise due to crosstalk appears on the playback screen, and the image quality deteriorates. Tangential skew adjustment (hereinafter referred to as skew adjustment) prevents this.

If the center axis of the disk, that is, the center axis of the turntable, and the drive straight line of the optical axis of the pickup are deviated, the optical axis does not cross the track (pit) perpendicularly during a track search or the like. , It crosses diagonally. For this reason, the reading accuracy decreases, and the search time becomes longer or in the worst case, the search becomes impossible. This is prevented by the R-dependent adjustment (hereinafter referred to as RD adjustment). In the prior art, the skew adjustment and RD
It is known that each adjustment uses a separate adjustment mechanism (cam or the like).

[0004]

However, in the above-mentioned prior art, since two adjusting mechanisms are used, the number of parts increases, the mechanism becomes complicated, and there is a problem that the adjusting operation takes time. The present invention aims to solve the above problems.

[0005]

In order to achieve the above object, according to the present invention, a pickup is slidably supported on a pickup chassis, and the pickup chassis is supported on a basic chassis by a pair of shafts. In a pickup supporting mechanism of a disc player capable of adjusting the angle of the pickup chassis in a direction perpendicular to the sliding direction with respect to the chassis, one shaft is supported while being biased by one elastic member on one of the upright surfaces of the basic chassis, The other shaft is supported by a helical groove of a cam erected on the basic chassis through an elongated hole of the other erected surface of the basic chassis, and the helical groove of the cam is eccentric from the outer peripheral surface of the cam. The angle of the pickup chassis can be adjusted by rotating.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of a main part, FIG. 2 is a cross-sectional side view of the main part, FIG. 3 is a perspective view of an adjusting cam, FIG. 4 is a plan view of the whole, and FIG. The main chassis (2) of (1) is internally fixed, and the basic chassis (4) is attached to the center of the main chassis (2) via left and right slide plates (3) (3) so as to be able to move up and down, and the rotating shaft (5). The turntable (6) is rotatably supported on the upper surface side of the chassis (4) via the.

[0007] A laser pickup (7) is mounted on a pedestal (8), and the pedestal (8) is slidable in the front-rear direction on a pickup chassis (11) via guide shafts (9) and (10). At the same time, a pickup moving rack gear (12) is fixedly mounted on the receiving table (8), a drive gear (13) is meshed with the rack gear (12), and a pickup motor (14) mounted on the left rear side of the pickup chassis (11). ), Each gear (1
2) The pickup (7) is reciprocally slid via the (13) to linearly move the pickup (7) toward and away from the axis of the turntable (6).

Further, a disk mounting surface (16) on which a laser disk (15) having a diameter of 30 cm is mounted, and a disk mounting surface (16) having a diameter of 2 cm.
Disk mounting surface (18) for mounting a 0 cm small diameter laser disk (17), disk mounting surface (20) for mounting a compact disk (19) having a diameter of 12 cm, and disk for mounting a small diameter compact disk (21) having a diameter of 8 cm. The mounting surface (22) is formed in multiple stages on the same axis on the upper surface of the tray (23), and the sliding rail groove (2) is formed.
4) (25) is formed on both sides of the tray (23), and the access rack gear (26) is formed on the lower surface of the tray (23).

In addition, access guide rails (27) and (28) are fixedly mounted on both sides of the main chassis (2), and a loading gear (30) that is rotated forward and reverse by a loading motor (29) is pivoted on the main chassis (2). The rails (27) and (2) of the main chassis (2)
8) The rail grooves (24) and (25) of the tray (23) are slidably fitted to the tray (23), and the loading gear (30) is meshed with the rack gear (26) of the tray (23). The tray (23) is moved into and out of the cabinet (1) by the forward / reverse rotation of the disc (15), (17) (1) from the turntable (6) position to the external exchange position.
9) (21) is configured to be moved.

Further, the pickup chassis (1)
The left and right side surfaces substantially at the front and rear widths of 1) are connected to the upright surfaces (31) and (32) of the basic chassis (4) via shafts (41) and (42). A pickup chassis (11) is mounted on the upper surface of the basic chassis (4) so as to freely move in a seesaw motion, and a cylindrical tilt cam (34) is rotatably supported on a front upper surface of the basic chassis (4) via a support shaft (33). ), A worm wheel (35) is integrally formed, a worm gear (36) is meshed with the worm wheel (35), and a basic chassis (4) is formed.
The tilt cam (34) is rotated in the forward and reverse directions via a worm gear (36) and a worm wheel (35) by a tilt motor (37) fixed to the cam (34), and an adjustment cam surface (38) formed on the upper end surface of the cam (34) is rotated. The pickup chassis (11) is configured to be brought into contact with the lower surface of the front portion of the pickup chassis, and the pickup chassis (11) is moved up and down to adjust the tilt of the pickup (7).

The upright surface (32) has an elongated hole (32).
a), the shaft (42) penetrates the hole (32a), and the tip thereof is formed in a spiral groove (43) of a cam (43) described later.
a) and an elastic member (40) is mounted on the other standing surface (31) between the pickup chassis (11) and the basic chassis (4). Further, a cam (43) for RD and skew adjustment is pivotally supported near the upright surface (32) on the upper surface of the basic chassis (4), and the cam (43) spirals around the outer periphery of the cylinder as shown in FIG. And a vertical surface (43b) of the groove.
Is slightly concentric with the outer periphery of the cam (43) without being concentric.

Next, the adjustment procedure will be described with reference to FIG. In FIG. 2, when the optical axis of the pickup (7) is inclined leftward with respect to the center axis of the turntable (6), the cam (4)
3) is rotated to the right and the shaft (42) is turned into the spiral groove (43).
Incline downward along a) to adjust the inclination between the optical axis and the central axis of the turntable (6). At this time, the moving straight line of the optical axis of the pickup (7) is the turntable (6).
3 is shifted to the right with respect to the center axis of the cam (43). To make the moving straight line of the optical axis coincide with the center axis of the turntable (6).

Similarly, when the optical axis of the pickup (7) is inclined to the right, the cam (43) is similarly rotated to the left,
The shaft (42) is tilted upward, the shaft (42) is brought into contact with the vertical surface (43b) eccentric to the cam center side by the elastic member (40), and the pickup (7) is tilted. Adjust the shift of the moving straight line of the optical axis to the left. It should be noted that the inclination angle and the shift distance to the left and right have a correlation and are determined by the structure of the pickup (7).

[0014]

As described above in detail, according to the present invention, it is not necessary to separately provide cams for skew adjustment and RD adjustment, and the skew / RD adjustment can be performed by one cam. Can be reduced, and the mechanism can be simplified. Also, the number of adjustment points in the manufacturing process can be reduced, so that the adjustment time can be shortened.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part.

FIG. 2 is a sectional side view of a main part.

FIG. 3 is a perspective view of an adjusting cam.

FIG. 4 is an overall plan view

FIG. 5 is a sectional plan view

[Explanation of symbols]

 (4) Basic chassis (6) Turntable (7) Pickup (11) Pickup chassis (31) (32) Standing surface (32a) Elongated hole (40) Elastic member (41) (42) Shaft (43) Cam ( 43a) spiral groove (43b) vertical surface

Claims (1)

(57) [Scope of request for utility model registration] A pickup is slidably supported on a pickup chassis, and the pickup chassis is supported on a base chassis by a pair of shafts, and the pickup is mounted on the base chassis in a direction perpendicular to the sliding direction. In a disk player pickup support mechanism capable of adjusting the angle of a chassis, one shaft is supported while being urged by an elastic member on one standing surface of a basic chassis, and the other shaft is supported on the other standing surface of the basic chassis. It is supported by a helical groove of a cam erected on the basic chassis through a long hole, the helical groove of the cam is eccentric from the outer peripheral surface of the cam, and the angle of the pickup chassis can be adjusted by rotating the cam. Features a pickup support mechanism for a disc player.