JPH02260242A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To evade a collision between a pickup head and an optical disk due to a warp and backlash, etc., of the optical disk by separating a head moving mechanism from a surface of the optical disk at the time of other than reproducing a data and moving the pickup head to the other end in a radial direction of the optical disk. CONSTITUTION:At the time of other than reproducing data, the head moving mechanism is separated from the surface of the optical disk by a driving mechanism, while the pickup head is moved to the other end of the optical disk in the radial direction by the head moving mechanism. That is, before the optical disk 2 is finally carried to a data reproducing position, a disk table 7 is held under the state of inclining against an optical disk plane with an outer peripheral side of the disk as a fulcrum by a prescribed angle. By this method, under these circumstances, the pickup head 17 is capable of keeping a certain degree of distance with the optical disk 2, so that the collision between the pickup head 17 and the optical disk 2 due to the warpage or backlash, etc., of the optical disk 2 is evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a disc playback device that plays back data from a double-sided playback type optical disc.

(Prior Art) Conventionally, there has been a disc playback device that plays back both sides of an optical disc with data recorded on both sides without reversing the optical disc.

In such a double-sided disc playback type disc playback device, double-sided playback is normally performed by moving the pickup head from one side of the optical disc to the other side.

By the way, in a normal playback state in a disk playback device, the distance between the pickup head and the optical disk needs to be 2Ilffi or less.

However, in the case of the mechanism for relatively moving the pickup head and the optical disk as described above, when the distance is 2 am or less as described above, there is a risk that the pickup head and the optical disk will collide due to warping or rattling of the optical disk.

(Problems to be Solved by the Invention) As described above, in the conventional double-sided disc playback device that has a mechanism for moving the pickup head and the optical disc relative to each other, the pickup head and the optical disc may be separated due to warping or rattling of the optical disc. There was a risk of a collision.

The present invention has been made to solve these problems, and aims to provide a disc playback device that can avoid collisions between a pickup head and an optical disc due to warping or rattling of the optical disc.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above-mentioned object, the disc reproducing device of the present invention reproduces data recorded on both the front and back sides of an optical disc by reversing the pickup head. In the disk reproducing apparatus configured as described above, when reproducing the data, there is provided a head moving mechanism for moving the pickup head in the radial direction of the destination disk, and one end of the head moving mechanism in the radial direction of the optical disk. a support part that supports the head moving mechanism so that it can rotate in the surface direction of the optical disk; and a drive that moves the head moving mechanism up and down in the surface direction of the optical disk at the other end of the head movement mechanism in the radial direction of the optical disk. a mechanism, and when the data is not being reproduced, the drive mechanism moves the head moving mechanism away from the surface of the optical disk, and the head moving mechanism moves the pickup head to the other end in the radial direction of the optical disk. The control unit is equipped with a control unit that controls the operation.

(Function) In the disk reproducing apparatus of the present invention, the drive mechanism moves the head moving mechanism away from the surface of the optical disk, and the head moving mechanism moves the pickup head to the other end in the radial direction of the optical disk. Since the pick-up head is moved in the opposite direction, it is possible to avoid collision between the pickup head and the optical disc due to warping or rattling of the optical disc.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an overall perspective view showing a disc playback device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a disk storage device that stores a plurality of double-sided playback type optical disks (hereinafter simply referred to as optical disks) 2, each of which has data recorded on both sides, vertically at predetermined intervals. . This disk storage container 1
An arc-shaped groove that follows the outer shape of the optical disk 2 is provided at the bottom of the optical disk 2 so that each optical disk 2 can be supported in a vertically removable manner.

A disk playback unit 3 for taking out a desired optical disk 2 from the disk storage 1 and reproducing data from the optical disk 2 is arranged above the disk storage 1 in which a plurality of optical disks 2 are stored. .

This disk reproducing unit 3 has its respective constituent parts integrated, and the entire unit is moved in the optical disk arrangement direction along guide shafts 4 fixed at both ends by a housing (not shown).

Each component of the disc playback unit 3 will be explained below.

The disc playback unit 3 is equipped with a lift lever 5 for lifting a desired optical disc 2 from the disc storage 1 to a predetermined height (data playback position).

This lift lever 5 is rotatably attached to the above-mentioned guide shaft 4 as an axis, and a roller 6 that rolls into contact with the circumferential edge of the optical disk 2 is attached to its tip.

The optical disc 2 lifted from the disc storage device 1 along the groove by the lift lever 5 is further carried to the data reproduction position along the groove provided in the guide lever (not shown) of the disc reproduction unit 3. It looks like this.

In addition, in this disc playback unit 3, the optical disc 2
A pickup head 17 (see FIG. 2) for reading out data recorded on the optical disc 2 using a laser beam.
A disk table 7 that engages with the center hole of the optical disk 2 and cooperates with a clamper (not shown) to provide rotational drive to the optical disk 2, a disk drive motor 8 serving as its drive source, and a disk drive motor 8 that prevents the optical disk 2 from warping. A single mechanical chassis 9 is equipped with a tilt mechanism (see FIG. 2) that detects the optical disk and makes the head surface of the pickup head face the two surfaces of the optical disk.

As shown in FIG. 3, the mechanical chassis 9 operates until the optical disc 2 is finally brought to the data reproduction position.
The disc table 7 is held at a predetermined angle tilted with respect to the optical disc surface using the disc outer circumferential side as a fulcrum so that the disc table 7 is located at a position deviated from its normal position. In this state, the pickup head 17 is always located at the farthest position from the fulcrum, that is, at the position closest to the center of the optical disc 2.

On the other hand, when the optical disc 2 is brought to the data reproduction position mentioned above, the mechanical chassis 9 moves as shown in FIG.
The disk table 7 is moved so as to reach its normal position.

In addition, such movement of the mechanical chassis 9
This is accomplished by rotatably supporting the outer circumferential side of the disk of the mechanical chassis 9, and moving the inner circumferential side of the disk of the mechanical chassis 9 up and down using a chassis movement control system that makes full use of a cam mechanism. This chassis movement control system consists of a protrusion 22 provided on the inner peripheral side of the disk of the mechanical chassis 9 and a base unit 11.
Engage with the cam 23 provided on the side (see Figure 2),
This is done by driving this cam 23 with a motor 25 (see FIG. 1) via a gear 24.

Further, the pickup head 17 is moved by a pickup head driving motor 18 via a rack and pinion gear 26.

Further, movement control of the mechanical chassis 9, that is, on/off control of the motor 25, is performed at predetermined timing by a logic control circuit (not shown) that comprehensively controls the entire device.

Now, the mechanical chassis 9 configured in this way is supported at two points by a pair of U-shaped guide rails 10a and 10b arranged so as to straddle the optical disc 2 set at the data reproduction position. 9 is this U
Letter-shaped guide rail 10a.

By moving along 10b, reproduction is switched from one side of the optical disc 2 to the other side.

FIG. 2 is a perspective view showing the details of the mechanical chassis 9 described above and the connection relationship between the mechanical chassis 9 and the U-shaped guide rail 10a110b.

In the figure, reference numeral 11 indicates a base unit for supporting the mechanical chassis 9 so that it can move freely along the U-shaped guide rails 10a and 10b.

This base unit 11 includes a shaft self-propelling motor 1.
2 (shown in Figure 1) is installed.

The shaft feeding motor 12 is rotated through a plurality of intermediate gears 13a, 13b, 13c, and 13d.
The power is transmitted to two roller drive gears 16a and 116b that engage with rack gears 14a and 14b provided on the letter-shaped guide rails 10a and 10b and roller grooves 15a and 15b.

This allows the mechanical chassis 9 to be connected to the U-shaped guide rail 10.
A mechanism for self-propelling along lines a and 10b is constructed.

Further, the base unit 11 described above is provided with a mechanism that locks the base unit 11 at a fixed position on the U-shaped guide rails 10a and iob when the mechanical chassis 9 reaches the data reproduction position.

In this figure, reference numerals 17, 18, and 19 indicate the above-mentioned pickup head, pickup head driving motor, and tilt mechanism driving motor, respectively.

The operation of switching the playback disk surface in the disk playback device configured as described above is performed as follows.

First, while data is being reproduced from one side of the optical disc 2, the mechanical chassis 9 is in the normal position, as shown in FIG.

When data reproduction on one side of the optical disc 2 is finished, the lift lever 5 rises to a height where it touches the peripheral edge of the optical disc 2 held between the disc table 7 on the mechanical chassis 9 and the clamper.

When the optical disc 2 can be supported by the lift lever 5, the mechanical chassis 9 and the clamper release the clamping of the optical disc 2, as shown in FIG. At the same time, the pickup head 17 is positioned closest to the center of the optical disc 2.

On the other hand, as shown in FIG. 5, in the mechanical chassis 9 (base unit 11), the claw portion 21d of the lock lever 21 is attached to the lock portion 31a of the U-shaped guide rails 10a, 10b at the data reproduction position on the left side in the figure. It is locked and locked.

Then, remove the lower claw part 21d of the lock lever 21 from the lock part 31a, and while maintaining the angle of the lock lever 21, move the mechanical chassis 9 to the U-shaped guide rails 10a, 10b.
to the data playback position on the opposite side.

When the mechanical chassis 9 reaches the vicinity of the data reproduction position on the opposite side, it is locked again. Then, as shown in FIG. 4, the optical disc 2 is clamped at its center hole by the disc table 7 on the mechanical chassis 9 and the clamper opposing it, and the lift lever that had supported the optical disc 2 until then is 5 is lowered to enable disc playback operation.

Thus, according to the disc reproducing apparatus of this embodiment, until the optical disc 2 is finally brought to the data reproducing position, the disc table 7 keeps the disc outer circumferential side relative to the optical disc surface, as shown in FIG. The pickup head 17 is held at a predetermined angle as a fulcrum, and in this state, the pickup head 17 is always at the farthest position from the fulcrum, that is, at the position closest to the center of the optical disc 2. It is being done. Therefore, in such a state, the pickup head 17 can maintain a certain distance from the optical disk 2, and collision between the pickup head 17 and the optical disk 2 due to warping or play of the optical disk 2 can be avoided.

That is, in a normal reproduction state, the distance between the pickup head 17 and the optical disc 2 needs to be 2 mm or less.

However, as in the disc playback device of this embodiment, the rad 17 and the optical disc 2 move #11 pairwise to the pickup #! In the case of the U structure, if the distance is 2 mm or less as described above, there is a risk that the pickup head 17 and the optical disk 2 will collide due to warping or rattling of the optical disk 2.

Therefore, as described above, when the pickup head 17 and the optical disk 2 move relative to each other, such a collision can be avoided by maintaining a certain distance between the pickup head 17 and the optical disk 2.

Note that the present invention is not limited to the embodiments described above.

For example, in the embodiment described above, the mechanical chassis 9 is moved by rotatably supporting the disk outer side of the mechanical chassis 9, and by a chassis movement control system that makes full use of a cam mechanism to move the disk inner side of the mechanical chassis 9. This was done by moving up and down, but I wouldn't buy it even if it was the other way around.

That is, the inner circumferential side of the disk of the mechanical chassis 9 may be pivotally supported, and the outer circumferential side of the disk may be moved up and down. In this case, the pickup head 17 is located at the farthest position from the fulcrum, that is, at the outer circumferential side of the optical disc 2, except when reproducing data.

Furthermore, although movement control of the mechanical chassis 9 has been performed by a logic control circuit that comprehensively controls the entire apparatus, it may also be performed in conjunction with, for example, a mechanism for moving the disk reproducing unit 3.

[Effects of the Invention] As explained above, according to the disc reproducing apparatus of the present invention, the drive mechanism moves the head moving mechanism away from the surface of the optical disc and the head moving mechanism moves the pickup head at times other than when reproducing data. Since the optical disc is moved to the other end in the radial direction of the optical disc, it is possible to avoid collision between the pickup head and the optical disc due to warping or rattling of the optical disc.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view showing a disc playback device according to an embodiment of the present invention, and Fig. 2 shows details of a mechanical chassis in the disc playback device and the coupling relationship between this mechanical chassis and a U-shaped guide rail. 3 is a side view showing the relationship between the pickup head and the optical disk when the mechanical unit is moving; FIG. 4 is a side view showing the relationship between the pickup head in the playback state and the previous disk; and FIG. FIG. 3 is a side view for explaining a switching operation between disk playback and playback in the same disk playback device. 2... Double-sided playback type optical disc, 5... Lift lever 7... Disc table, 8... Disk drive motor, 9... Mechanical chassis, 10a, 10b... U-shaped guide rail, 11...・・Base unit, 12・・
- Shaft self-propelling motor, 17...Pickup head, 22...Protrusion, 23...Cam, 24...Gear, 25...Motor, 26...Rack and pinion gear.

Claims (1)

[Scope of Claims] A disc playback device configured to play back data recorded on both the front and back sides of a double-sided playback type optical disc by reversing a pickup head, comprising: a head moving mechanism for moving the optical disk in a radial direction; a support section that supports one end of the head moving mechanism in the radial direction of the optical disk so that the head moving mechanism can rotate in a surface direction of the optical disk; a drive mechanism that moves the head moving mechanism up and down in the surface direction of the optical disk at the other end of the mechanism in the radial direction of the optical disk; A disc playback device comprising: a control unit that moves the pickup head away from the surface of the optical disc and moves the pickup head to the other end in the radial direction of the optical disc by the head moving mechanism.