JPS63279477A - Information reader for disk player - Google Patents

Abstract

PURPOSE:To realize fine adjustment with high accuracy by executing the adjustment of a laser beam for the storage track of an information recording disk with the aid of a differential screw. CONSTITUTION:The corresponding screw holes 11d and 14d are respectively formed to a first holding member 11 and a second holding member 14 and the differential screws 19 which have different pitch are screwed to both screw holes 11d and 14d. Besides, a coil spring is press-installed between the screw holes 11d and 14d and inserted to the differential screws 19. By rotating the differential screw 19, the second holding member 14 is rotated for the first holding member 11 making the protrusion of the member 11 being a rotation holding shaft as a center. As the result, an optical pick-up on the second holding member 14 is inclined. Thus the fine adjustment of the angle of the incidence of the laser beam for the recording track can be executed with high accuracy.

Description

[Detailed description of the invention] Technical field The present invention relates to an information reading device for a disc player.

BACKGROUND ART FIG. 11 schematically shows a conventional information reading device for a disc player. As shown in the figure, a carriage 53 carrying an optical pickup including an objective lens 52 for irradiating the recording surface of the disk 51 with a laser beam is provided. The carriage 53 is slidably supported by a guide shaft 55, which serves as a guide member and is arranged parallel to the disk supporting surface 54a of the turntable 54. Further, although not shown, driving means for moving the carriage 53 is provided.

In such an information reading device, it is necessary to adjust the direction of the laser beam with respect to the recording track 51a of the disk 51 in two directions: the tangential direction of the recording track (tangential direction) and the radial direction of the disk (radial direction). be. For this reason, for example, the part of the carriage 53 that supports the optical pickup is made rotatable relative to other parts in the directions of arrows T and R, which correspond to the tangential direction and the radial direction of the disk, respectively, and the rotation The angular position is finely adjusted by rotating the movable portion relative to the fixed portion other than the rotatable portion by a predetermined adjusting means (fl).

However, in recent players of composite discs such as digital audio discs containing video information,
There is a desire for a device that can perform fine adjustment with higher precision while being low cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its purpose is to provide information reading that allows further fine adjustment of the incident angle of a laser beam with respect to the recording track of an information recording disk with high precision. The purpose is to provide equipment.

In the information reading device according to the present invention, a carriage carrying an optical pickup and guided by a guide means can freely position an optical pickup relative to a first member guided by the guide means and the first member. and a second member carrying a pickup, and a differential screw is provided which screws into the first and second members to determine the relative position of the first and second members. There is.

Embodiments Hereinafter, an information reading device as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the information reading device has a support mechanism consisting of a mechanical chassis 1 and a base plate 2 that are arranged parallel to each other. The mechanical chassis 1 supports various parts that will be described later, and the base plate 2 is connected to the mechanical chassis 1 with screws or the like and mainly increases the mass of the information reading device as a whole.
Moreover, it acts as a ballast weight to lower the center of gravity. Therefore, the base plate 2 is made of a relatively thick steel plate. Note that the base plate 2 is attached to the player housing via a vibration isolating member 3 made of rubber. As shown in FIG. 3, a spindle motor 4 and a turntable 5 which is directly driven by the spindle motor 4 are attached to the mechanical chassis 1, and the mechanical chassis 1 and base plate 2 are connected to the disk supporting surface of the turntable. They are spaced apart by a predetermined distance in the orthogonal direction.

A worm 6 is arranged between the mechanical chassis 1 and the base plate 2 parallel to the disk supporting surface of the turntable 5, and is rotatably attached to the mechanical chassis 1. A motor 7 is provided on the side of the worm 6 in the mechanical chassis 1. There is a pulley 7 on the output shaft of the motor 7.
A belt 8 is fitted between the pulley 6a fitted to the end of the worm 6 and this pulley 7a.

A guide shaft 10 as a single guide member is provided parallel to the worm 6 and is supported by the mechanical chassis 1 at both ends. As also shown in FIGS. 4 to 6, the first support member 1 is
1 is slidably supported. The first support member 11 engages the guide shaft 10 at two points 11a, llb. As shown in FIGS. 3 to 6, the first support member 11
A protrusion 11c is formed on the protrusion 11c, and the second support member 14 is rotatably attached to the protrusion 11c at one end thereof. As is particularly clear from FIGS. 4 and 5, a pair of small hemispherical protrusions 14a and 14b are formed in opposite directions at the other end of the second support member 14, with a notch spaced between them. Mechanical chassis 1 and guide shaft 10
The pair of hemispherical protrusions are in sliding contact with a guide path 1a (shown in FIG. 1) formed parallel to the mechanical chassis so as to sandwich the mechanical chassis in the thickness direction. That is, the mechanical chassis 1 also functions as a guide member that guides the second support member 14. Further, the pair of hemispherical protrusions 14a
and 14b are provided very close to each other and are oriented in opposite directions, so that the other end of the second supporting member 14 contacts the guide path 1a of the mechanical chassis 1 at substantially one point. It has a shape.

The first support member 11 and the second support member 14 described above constitute a carriage that supports the optical pickup 17 including the objective lens 16. However, the optical pickup 17 is mounted on the second support member 14.

As shown in FIGS. 1 and 4, the first support member 11 and the second support member 14 have corresponding screw holes 11d and 1, respectively.
4d is formed, and Figures 1 to 3 and 6
Differential screws 19 having different pitches as shown in the figure
are both screw holes 11d.

It is screwed into 14d. In addition, each screw hole lid and 14
A coil spring 20 is compressed between d and inserted into the differential screw 19.

That is, by turning the differential screw 19, the second support member 14 rotates relative to the first support member 11 around the protrusion 11c of the first support member 11, which is its rotation support axis,
As a result, the optical pickup 17 on the second supporting member is tilted, and the angular position of the laser beam relative to the recording track of the information recording disk 21 (shown in FIG. 7) in the disk radial direction is adjusted. It is structured as follows.

The pitch of each threaded portion of the differential screw 19 is, for example, 0. 5 (mm) and 0. 7 (mm),
By making one rotation of the differential screw 19, each threaded portion of the first support member 11 and the second support member 14 into which the differential screw engages becomes 0.0. Move toward or away from each other by 2 (mm). Note that, as shown in FIGS. 1, 3, 4, and 6, screws 23 and leaf springs 24 are provided for crimping the second support member 14 to the first support member 11. .

As shown in FIGS. 1 to 5, an optical pickup 1
A screw insertion hole is formed at the side end of the body portion of 7, and an adjustment screw 26 is inserted through the screw insertion hole. The adjusting screw 26 is threaded into a threaded hole 14e (shown in FIG. 1) formed in the second carrier member 14. Also,
As shown in FIGS. 1 and 5, an optical pickup 1
A coil spring 27 is compressed between the body portion 7 and the second support member 14 . That is, by turning this adjustment screw 26, the optical pickup 17 is tilted, and the direction of the recording track tangent of the laser beam to the recording track of the information recording disk 21 (shown in FIG. 7) is adjusted.
The structure is such that the angular position can be adjusted in the tangential direction.

As is clear from FIGS. 4 and 5, the second support member 14
The rotation shaft 14f is a guide shaft 10 which is a guide member.
and a second line that is perpendicular to the longitudinal direction of the guide path 1a (shown in FIG. 1) of the mechanical chassis 1 and parallel to the virtual guide surface that includes both the guide shaft and the guide path 1a.
It passes through the contact point between the support member 14 and the guide path 1a. With this configuration, the angular position adjustment of the laser beam with respect to the recording track of the information recording disk can be performed independently in the two directions, the tangential direction and the radial direction, without affecting each other.

As shown in FIGS. 1, 3 to 5, a half nut 30 is attached to the first supporting member 11 by a screw 31 and a coil spring 32. As shown in FIGS. The half nut is screwed onto the worm 6, and as the worm 6 rotates as the motor 7 rotates, the carriage (described above) including the first support member 11 is moved along the guide shaft 10. As shown in FIG. 8, the second support member 14 has a pointed projection 14g.
The pointed protrusion engages in a recess 30a formed in the half nut 30 and having a conical bottom. This allows the half nut 30 to swing freely along a spherical surface including two arcs indicated by U and W in FIG.

Further, another pointed projection 14h is formed on the second support member 14 in parallel with the above-mentioned pointed projection 14g, and this pointed projection 14h extends along the above-mentioned arc U on the half nut 30. A recess 30b whose bottom is roof-shaped is formed as follows.
engaged within. The width dimension of this recessed portion 30b, that is, the dimension in the direction along the above-mentioned arc W is the point of the pointed protrusion 1.
4h, and as a result, the half nut 30 is restricted from moving along the arc W, and only moves along the arc U. That is, the half nut 30 is movable at least along a plane including the central axes of the guide shaft 10 and the worm 6.

As shown in FIG. 3, a detection switch 34 is provided on the lower surface of the mechanical chassis 1 for detecting that the optical pickup 17 has reached a position corresponding to the lead-in track of the information recording disk 21. Further, as shown in FIG. 1, an area sensor 35 is provided to detect that the optical pickup 17 is in a range corresponding to a predetermined position (video area) of the information recording disk 21, and a wiring board 36 is provided. It is attached to the mechanical chassis 1 via.

As shown in FIGS. 1, 2, and 7, the turntable 5 is provided with a centering ring 37 that fits into the center hole of the information recording disk 21 and centers the disk so that it can be protruded and stored. Further, a coil spring 38 is provided to apply a bias force to the centering ring in the protrusion direction.

Further, in FIG. 7, reference numeral 39 indicates a disc-shaped suppressing member that presses the information recording disc 21 against the turntable 5 to perform a disc clamping action. The disk-shaped suppressing member 39 has an annular magnet 39a, and the disk is clamped by attracting the annular magnetic member 5a provided on the turntable 5.

FIG. 9 shows a partial modification of the embodiment. As shown in the figure, a disc-shaped suppressing member 43 is provided with an alignment ring 42 that fits into the center hole of the information recording disc 21 and centers the disc with respect to the turntable 41. In addition, an annular magnet 41a is attached to the turntable 41.
The suppressing member 43 is provided with an annular magnetic member 43a that attracts the magnet.

In the above embodiment, the optical pickup was fixed to the second support member 14, but if the dimensions allow, the 21st!
The holding member 14 may be integrated with the optical pickup. In this case, as shown in FIG. 10, the tip of the adjusting screw 26 directly contacts the guide path 1a. Here, it goes without saying that the tip of the adjustment screw 26 is arranged on the rotation axis of the protrusion 11c of the first support member 11.

Effects of the Invention As detailed above, in the information reading device according to the present invention, the carriage carrying the optical pickup and being guided by the guide means has the first carriage guided by the guide means.
and a second member that carries an optical pickup and can be positioned relative to the first member, and is screwed to the first and second members to connect the first and second members. A differential screw is provided for relative positioning.

In this way, by adjusting the incident angle of the laser beam with respect to the recording track of the information recording disk using the differential screw, fine adjustment with higher precision can be achieved with a simple and inexpensive configuration.

[Brief explanation of the drawing]

1 to 3 are bottom views including an exploded view, a top view, and a partial top view of an information reading device as an embodiment of the present invention, and FIGS. 4 to 8 are partially detailed views, 9 and 10 are diagrams showing a partial modification of the embodiment, and FIG. 11 is a diagram showing a conventional information reading device. Explanation of symbols of main parts 1... Mechanical chassis 1a... Guide path 2... Base plate 4... Spindle motor 5... Turn table 6...Worm 7...Motor 10...Guide shaft 11...First support member 12...Second support member 17... ...Optical pickup 19...Differential screw 21...Information recording disk 26...Adjustment screw 30...Half nut

Claims (1)

[Claims] An information reading device for a disc player comprising a guide means, a carriage guided by the guide means and carrying an optical pickup, and a drive means for driving the carriage, wherein the carriage is guided by the guide means. a first member, and a second member that is positionable relative to the first member and carries the optical pickup.
An information reading device comprising: a differential screw that is screwed into the first and second members to relatively position the first and second members.