JPH01113973A - Disk player - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to attain a thin and low cost player with a simple constitution by inverting an arm on which a pickup is mounted at a position externally of the major diameter of a disk and reproducing the face of an opposite side. CONSTITUTION:A guide means 20 is separated by a prescribed distance from the moving line 30 of the pickup 11 to guide a slider 7. The pickup 11 is fixed at the end of the arm 21 rotatably mounted on the slider 7 and the arm 21 is vertically extended on the guide means substantially in parallel to the disk 4. When a feed screw 24 is rotated by a slider motor, the slider 7 screwed by the feed screw 24 is guided by the guide means 20, moved and the pickup 11 moves on the radial line of the disk 4. When the arm 21 is situated externally of the major diameter of the disk, it is rotated by about 180 deg. by a rotating means 43. Thereby, the face opposite to the disk can be reproduced to attain the compact and low cost player with the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc player, typified by an optical video disc player.

[Summary of the invention]

In the present invention, the arm, which has a pickup attached to its tip, is turned over at a position outside the outer diameter of the disk, and the opposite side is reproduced.

[Background technology]

FIG. 2 shows the configuration of a conventional disc player. In the figure, 1 is a spindle motor that rotates a turntable 2. As shown in FIG. A clamper 3 clamps the disk 4 onto the turntable 2. A guide bar 5 is placed under the disk 4 and guides the sliding movement of the slider 7 in the disk radial direction. 6 is a guide bar placed above the disk 4. A gear 8 is attached to the slider 7 and meshes with a substantially U-shaped rack 9. When the slider motor (not shown) attached to the slider 7 is rotated, the gear 8 is driven.
Slider 7 moves (slides) in the radial direction of disk 4
be done. At this time, the slider 7 is guided in its sliding movement by the guide bar 5.

A pickup 11 is mounted on the slider 7, and the pickup 11 is also moved along with the slider 7 in the disk radial direction. As a result, signals recorded on tracks from the inner circumference to the outer circumference of the disk 4 are reproduced.

The slider 7 is also equipped with a tilt control mechanism.

That is, the pickup 11 is rotatably supported by the slider 7 using the pin 12 as a fulcrum. When the drive mechanism 13 is driven, the pickup 11 rotates about the pin 12, and its angle with respect to the disk 4 can be controlled.

The lower surface of the disc 4 is reproduced as described above, but when the upper surface of the disc 4 is reproduced, the gear 8 is driven, and the slider 7 is pulled out from the guide bar 5 and fitted into the guide bar 6. During this time, the slider 7 is reversed while being guided by the rack 9, and the pickup 11 is directed downward (toward the disk 4).

Then, reproduction and tilt control are performed in the same way as in the case of the bottom surface.

[Problem that the invention seeks to solve]

In conventional disc players, the entire slider with the pickup mounted thereon is moved to the opposite side of the disc using a rack, and the slider is guided by a guide bar provided on the opposite side, so there are many parts.
Furthermore, the mechanism is complicated, large-sized, and costly.

Therefore, the present invention is intended to reduce the number of parts, and to achieve a reduction in thickness and cost with a simple configuration.

[Means for solving problems]

The disc player of the present invention includes a pickup for reproducing signals recorded on the disc, a guide means arranged at a predetermined distance from a movement line of the pickup in the radial direction of the disc, and a slider guided by the guide means. and an arm extending substantially parallel to the disk and perpendicular to the guide means, having one end attached to the slider and a pickup attached to the other end, and the pickup mounting surface of the arm facing one side of the disk. It is characterized by comprising a rotating means for rotating the arm approximately 180 degrees from the state to the state facing the opposite side.

[Effect]

A guide means is arranged at a predetermined distance from the line of movement of the pickup, and the slider is guided by this guide means. An arm is rotatably attached to the slider, and a pickup is fixed to the tip of this arm. Since the arm extends substantially parallel to the disk and perpendicular to the guide means, when the slider moves while being guided by the guide means, the pickup moves on the radial line of the disk. When the arm is positioned outside the disk outer diameter,
It is rotated approximately 180 degrees by the rotation means. This allows the opposite side of the disc to be played.

Therefore, a compact, low-cost player can be realized with a simple configuration.6 [Embodiment] FIG. 1 shows the configuration of the disc player of the present invention, and the parts corresponding to those in FIG. are given the same reference numerals. Also in the present invention, the disk 4 clamped on the turntable 2 by the clamper 3 is rotated by the spindle motor 1, but the guide bar 20 as a guide means for guiding the slider 7 is
), the pickup 11 (objective lens 31) is placed at a predetermined distance from the movement line 30 in the disk radial direction (in this case, outside the outer diameter of the disk 4) when viewed from the top. The slider 7 is fitted into the guide bar 20 and guided. Reference numeral 21 denotes an abbreviated arm, the short side of which is attached to the slider 7, and the long side of which is approximately parallel to the disk 4 and extends in a direction perpendicular to the guide bar 20. A pickup 11 is fixed near the tip of the long side. An arm 21 indicated by a solid line in the figure is located on the lower surface side of the disk 4.

When the feed screw 24 is rotated by a slider motor (not shown), the slider 7 screwed onto the feed screw 24 is guided by the guide bar 20 and moved in the left-right direction in FIG. 1(b). A roller 23 is rotatably attached to the tip of the arm 21, and this roller 23 rotates while contacting the lower substrate 25. This prevents the arm 21 from rotating downward (toward the center in FIG. 1(c)) about the guide bar 20 or the feed screw 24 due to its own weight.

The pickup 11 is attached to the arm 21 so that the distance from the center of the objective lens 31 to the guide bar 20 is approximately equal to the distance from the center of the disk 4 to the guide bar 20. Therefore, when the arm 21 moves, the objective lens 31 moves on the radial line of the disk 4 parallel to the guide bar 20, and the signal on the lower surface of the disk 4 is reproduced.

When reproducing a signal on the upper surface of the disk 4, the arm 21 is moved to the outside of the outer diameter of the disk 4 (to the right side of the disk 4 in FIG. 1(b)).

The arm 21 is connected to a shaft 22 inserted through the slider 7, and a gear 41 is connected to the other end of the shaft 22. Further, a motor 43 for rotating a gear 42 is mounted on a substrate (not shown).

The arm 21 is moved to a position where the gear 41 meshes with the gear 42, and then stopped. At this position, the motor 43 constituting the rotating means is energized and the gear 42 is rotated. As a result, the gear 41 is rotated, and the arm 21 is rotated 180 degrees about the shaft 22.

This rotation center corresponds to the center of the disk 4 in the thickness direction. As a result, the arm 21 is arranged on the upper surface side of the disk 4, as shown by the broken line in the figure, symmetrically to the arm 21 on the lower surface side. In this state, the feed screw 24 is rotated in the opposite direction, and the arm 21 is moved toward the center of the upper surface of the disk 4.

When the pickup 11 is moved to a position corresponding to the innermost track of the disc 4, the feed screw 24 is reversed again, and the upper surface of the disc 4 is reproduced. At this time, the roller 23 is supported by the upper substrate 26.

Incidentally, the tilt control is performed by rotating the guide bar 20 in a direction perpendicular to the disk 4 by means not shown.

FIG. 3 represents another embodiment of the invention.

In this embodiment, a guide bar 20 and a feed screw 24 are used.
is arranged inside the disk 4. The other configurations are the same as in FIG. 1. This embodiment also allows the same operation as in the case of FIG. 1 to be performed.

〔effect〕

As described above, according to the present invention, the slider is guided by the guide means arranged at a predetermined distance from the movement line of the pickup, the slider supports an arm extending perpendicularly to the guide means, and the pickup is attached to the tip of the arm. Since it is installed, it has a simple configuration with a small number of parts.
A single pickup not only enables reproduction of both sides of the disc, but also prevents the device from becoming larger.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) are a plan view, a rear view, and a side view of a disc player of the present invention, FIG. 2 is a side view of a conventional disc player, and FIG. 3 is a side view of a disc player of the present invention. FIG. 7 is a side view of another embodiment. 1...Spindle motor 2...Turntable 3...Clamper 4...Disk 5.6...Guide bar 7...Slider 8...Gear 9...Rack 11...Pickup 12... Pin 13... Drive mechanism 20... Guide bar 21... Arm 22... Axis 23... Roller 24... Feed screw 25.26... Board 30... Movement Line 31...Objective lens 41.42...Gear 43...Motor patent applicant Pioneer Corporation Figure 1 Figure 1 (c)

Claims (1)

[Claims] A pickup for reproducing signals recorded on a disk; a guide means disposed at a predetermined distance from a movement line of the pickup in the radial direction of the disk; a slider guided by the guide means; an arm extending in a direction substantially parallel to the disk and perpendicular to the guide means, one end of which is attached to the slider and the other end of which the pickup is attached; From facing one side to facing the other side,
A disc player comprising: rotating means for rotating the arm approximately 180 degrees.