JPH0628678A - Disk player - Google Patents

Abstract

PURPOSE:To keep the distance to a disk constant even when a pick-up is positioned at above and below the disk in a disk player capable of reproducing both upper and lower surfaces. CONSTITUTION:The moving mechanism of the pick-up 4 and the tilt.height mechanism of the pick-up 4 are provided on a carriage base on which a pick-up base 4a is placed. Then, in a tilt spindle 31 and 32 of the pick-up base 4a, the spindle 31 nearer to a turntable side than a pick-up optical axis is used when the surface of the disk is reproduced, then the spindle 32 nearer to the oppsite side of the turntable than the pick-up optical axis is used when the rear side of the disk is reproduced.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a compact disc,
The present invention relates to a disc player capable of recording or reproducing double-sided signals on a disc-shaped recording medium such as a laser disc.

[0002]

2. Description of the Related Art Conventionally, as a method of continuously reproducing discs recorded on both sides with an optical disc player,
A mechanism according to Japanese Patent Laid-Open No. 2-66729 (G11B7 / 08) is proposed. This mechanism includes front surface pickup moving means and rear surface pickup moving means, and further has means for rotating the pickup 180 degrees outside, and the pickup includes a moving mechanism, a tilt mechanism, and a height mechanism.

However, in the case of this mechanism, a means for connecting the pickup moving means on the front surface and the pickup moving means on the back surface, for rotating the pickup by 180 degrees, is used.
It is very complicated, has many parts and man-hours, and has a drawback that the structure of the pickup is complicated because the moving mechanism, the tilt mechanism, and the height mechanism are each driven by a motor.

Further, Japanese Unexamined Patent Publication No. 62-287476 (G11B21 / 02) has a front pickup moving means and a back pickup moving means, and both guide means are connected by a U-shaped connecting means. The pickup is equipped with a tilt mechanism.

Since the mechanism of this structure connects the pickup moving means on the front surface and the pickup moving means on the back surface, it is connected by a U-shaped connecting means and has a simple mechanism. However, only the tilt mechanism is used for the pickup. However, since the height mechanism required for recording / reproducing a large warped disk is not provided, there is a possibility that reproduction cannot be performed beyond the movable range of the objective lens of the pickup.

Further, the pickup tilt mechanism, which is generally used in the single-sided reproducing apparatus, shifts the tilt fulcrum toward the turntable side from the pickup optical axis, and at the same time as the tilt operation, the height also changes and the recording of the warped disc is performed. -It has a tilt / height mechanism necessary for playback, but if this mechanism mechanism is equipped with a tilt spindle that matches the playback of the front side, the tilt spindle will pick up the optical pickup when performing backside playback. Since it is not on the turntable side of the shaft, the relationship between tilt and height is opposite, so there is the drawback that it cannot be used.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks, and in a disc player capable of reproducing both upper and lower surfaces, the disc distance is constant even when the pickup is at the upper and lower positions. The purpose is to keep.

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, a disc on which information can be recorded or information is recorded on both the front surface and the back surface, and information is recorded on or reproduced from the disc. In order to obtain a pickup and an optical system perpendicular to the front surface and the back surface of the disk, two tilt support shafts are provided on the pickup or a carriage around the pickup, and the tilt and height can be changed, and the pickup is provided. A pickup moving means for moving, a linear first guiding means for guiding the pickup in the radial direction of the front surface of the disk by the pickup moving means, and a radial movement guide for the back surface of the disk in the pickup. A pickup guide means composed of a second linear guide means and a U-shaped connecting means for connecting the two guide means. Ete is made disc player.

[0009]

When the reproduction is performed by the linear first guide means for guiding the radial movement of the surface of the disk, the reproduction is also performed by the linear second guide means for guiding the radial movement of the back surface of the disk. At this time, the tilt spindle operates so that it is on the turntable side of the pickup optical axis, so when a disc with a large warp is mounted, the tilt / height mechanism works and playback can be performed without problems. Becomes

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. 1, 2 and 3. FIG. 2 shows the pickup base (4
3A is a top view, a front view, and a side view of a carriage base (6) equipped with a tilt / height mechanism of FIG.

The pickup (4) is fixed to the pickup base (4a), and the pickup base (4a) is provided with two tilt support shafts (31) and (32) and a tilt operating pin (35). ing.

Further, the carriage base (6) has a motor (5) and a gear (9) as a driving source for moving the guides on the front and back surfaces of the disk and the U-shaped guide connecting them.
The axis (1 that accurately guides the normal of the disc during playback
6) There is a bearing (22) of (17).

Further, the carriage base (6) has 2
Blocks (25) (26) and levers (2) capable of holding and releasing the two tilt support shafts (31) (32), respectively.
7) Two sets of mechanisms (28) are provided, and the worm gear (38) attached to the motor (34) drives the worm wheel (33) with the end cam for the tilt / height operation. , The pin (35) is attached to the end of the pickup base (4a) pressed down by the spring (37).
Tilt / height is adjusted with the Muwheel (33).

Next, the operation of the present invention will be described with reference to FIGS. Since the present invention connects the pickup moving means on the front surface and the pickup moving means on the back surface, the structure of connecting with the U-shaped connecting means is the same as that in Japanese Patent Laid-Open No. 62-28746, so that the tilt / height mechanism of the pickup is used. Only explained.

In FIG. 3, when reproducing the disc on the surface (state A in FIG. 1), the lever (27) provided on the carriage (6) is the guide base (2) of the carriage (6).
The pin (27b) provided on the lever (27) is pushed by the wall (36) provided on the 0), the clamper (27a) of the lever (27) moves in the direction of (a), and the pickup base.
One of the tilt support shafts (31) of the space (4a) is released.

The tilt / height operation is restricted, and the support shaft (32) is held by the clamp (28a) of the block (26) and lever (28) by the spring (30) of the lever (28). With the fulcrum as the fulcrum, the tilt / height is adjusted by rotating in the directions of (c) and (d).

Next, when the reproduction from the front surface to the reproduction from the rear surface is performed, the carriage (6) moves in the outer peripheral direction of the disk, and at the same time, the pin (27b) provided on the lever (27) is provided on the guide base (20). Removed from the wall (36) and the lever
The clamper (27a) of (27) is the tilt support shaft (31).
Clamp. Therefore, the pickup base (4
In a), the U-shaped guide means does not fall while moving. (State B in FIG. 1) Furthermore, when reproducing the back side,
(State C in FIG. 1) A lever (28) provided on the carriage opposite to the surface is provided with a pin (28) provided on the lever (28) on a wall (not shown) provided on the guide base (20).
b) is pushed, the clamper (28a) of the lever (28)
Moves in the direction of (b) to release one tilt support shaft (32) of the pickup base (4a).

The tilt / height operation is not regulated at all, and the support shaft (31) held by the block (25) and the clamper (27a) of the lever (27) is held by the spring (29) by the lever (27). As a fulcrum, the tilt / height is adjusted by rotating in the directions of (f) and (e).

[0019]

According to the present invention, since the front pickup moving means and the back pickup moving means are connected, U
In a simple mechanism connected by a letter-shaped connecting means, the radial movement guide of the back surface of the disk is performed even when the reproduction is performed by the linear first guide means that guides the radial movement of the disk surface. Even when reproducing with the second linear guide means, the tilt support shafts operate so as to be on the turntable side of the pickup optical axis. Therefore, when a disc with a large warp is mounted, the tilt / height mechanism is used. Works, and reproduction is possible without any problem.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a pickup of the present invention.

FIG. 3 is a view showing a tilt / height mechanism of the present invention.

[Explanation of symbols]

 4 Pickup 5 Motor 9 Gear 20 First Guide Means 21 Second Guide Means 31 Tilt Spindle 32 Tilt Spindle 33 Worm Wheel 34 Motor 35 Pin 38 Worm Gear

Claims (1)

[Claims] 1. A disc on which information can be recorded or information is recorded on both the front surface and the back surface, and a pickup which records information on the disk or reproduces information from the disk; To obtain an optical system perpendicular to
Two tilt support shafts are provided on the pickup or a carriage around the pickup to make the tilt and height variable, a pickup moving means for moving the pickup, and a pickup moving means for moving the disc of the pickup. A disc player comprising a linear first guide means for guiding radial movement of the front surface and a linear second guide means for guiding radial movement of the back surface of the disc of the pickup.