JPH0845082A - Information reproduction board and double-sided information reproduction board - Google Patents

Abstract

(57) [Summary] [Constitution] According to the present invention, an information surface of a first surface in which an information signal is recorded as an uneven information signal sequence and an information of a second surface in which an information signal is recorded as an uneven information signal string. An information reproducing board having a surface, the start point of the information signal sequence of the information surface of the first surface is located at the innermost circumference, and the information is recorded in a spiral or concentric pattern toward the outer circumference. The reproduction start point of the information signal sequence on the surface is located at the outermost circumference, and is recorded spirally or concentrically toward the inner circumference. According to the present invention, even if the reproducing apparatus has only one reproducing pick-up, the moving time of the reproducing pickup during reproduction from the first information surface to the second information surface. Can be eliminated and the information reproduction is not interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus for reproducing information with laser light.

[0002]

2. Description of the Related Art In an optical video disk device for reading a signal from an information disk by using a light beam, unevenness having a width of 0.5 μm and a length of 0.5 to 1.8 μm is formed on the information disk from the inner circumference to the outer circumference. The signal is engraved in a spiral pattern toward you. In order to read the signal of the unevenness, usually, a light beam is focused on a minute spot by an objective lens and is irradiated on the unevenness on a rotating information disk. At this time, the reflected light is diffracted by the unevenness, so that by receiving the reflected light by the photodetector, a reproduction signal corresponding to the unevenness can be obtained. With the rotation of the information disk, the signal train goes from the inner side to the outer side, so that a continuous signal can be reproduced by moving the light beam to the outer circumference.

By the way, a conventional information disc is such that two information discs having concaves and convexes are attached to each other so that both sides of the information disc can be recorded and reproduced. In order to reproduce both sides of this information disk, it is necessary to stop the rotation, remove the chucking, turn the information disk over, and chuck and rotate again after the one-sided reproduction is completed. Therefore the surface (first
When trying to play back from the side) to the back (the second side) continuously, the time interruption between them will inevitably occur,
Moreover, it is necessary to turn it over.

There is also a method of providing an optical pickup for front surface reproduction and a rear surface reproduction in order to eliminate the operation of turning over, and a method of providing a mechanism for moving the optical pickup from the front surface to the rear surface. However, in the conventional double-sided bonded information disc, both sides have exactly the same recording form, and in order to perform a normal operation without removing the same motor, the rotation direction must be reversed when viewed from the optical pickup. Therefore, when the reproduction is switched from the front surface to the rear surface, the rotation is temporarily stopped and the reverse rotation is performed. Therefore, the temporal interruption inevitably occurs during this time, and continuous reproduction cannot be performed.

[0005]

As described above, when the information is reproduced on both sides, a time of "interruption" is always necessary, and in the case of a movie, this " The "interruption" time will be a concern.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a double-sided information reproducing board which enables continuous reproduction of both sides of a double-sided information reproducing board which is bonded to each other without interruption in time.

[0007]

The present invention provides an information signal,
An information reproducing board having an information surface of a first surface recorded as a concavo-convex information signal sequence, and an information surface of a second surface recorded with an information signal as a concavo-convex information signal sequence, wherein the information of the first surface is The start point of the information signal sequence on the surface is on the innermost circumference and is recorded in a spiral or concentric pattern toward the outer circumference, and the start point of the reproduction of the information signal sequence on the information surface on the second surface is on the outermost circumference and is spiral. Alternatively, the information reproducing board is characterized by being recorded concentrically toward the inner circumference.

Further, according to the present invention, a first information disk having a first information surface on which an information signal is recorded as an uneven information signal sequence, and a second surface on which an information signal is recorded as an uneven information signal sequence. A second information disk having an information surface of No. 1 is attached to each other, and the starting point of the information signal sequence of the information surface of the first surface is the innermost circumference, and the information disk is spiral or concentric. Both sides are recorded toward the outer circumference, and the starting point of reproduction of the information signal sequence of the second information surface is at the outermost circumference, and are recorded spirally or concentrically toward the inner circumference. It is an information reproduction board.

[0009]

According to the present invention, even if the reproducing apparatus has only one reproducing pick-up, the moving time of the reproducing pickup during reproduction from the first information surface to the second information surface. Can be eliminated and the information reproduction is not interrupted.

[0010]

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. (A) shows an information signal sequence 12 on one information surface 11. In this case, the recording start 13 of the information is at the innermost circumference, and spiral recording is made toward the outer circumference of the right hand winding. (B) shows the other information surface 14, which is recorded in a left-handed spiral from the inner circumference 16 toward the outside. Such two information disks are attached to each other with the surface on which the reproduction light beam is incident facing outside.

FIG. 2 is a diagram showing the operation of the apparatus for double-sided reproduction using the information disk of the present invention. The double-sided information disk 21 is fixed to the turntable 23 that rotates together with the motor 22 with the clamper 24, and the motor 22 rotates clockwise. When reproducing the lower first surface 11, the lower optical pickup 25 is moved to the information start position (inner circumference),
Playback starts from that position. As described with reference to FIG. 1, the signal train on the first surface 11 is a right-handed spiral. Therefore, as the motor 22 rotates, this signal train (track) becomes a spiral toward the outside with respect to the optical pickup 25. Therefore, if the optical pickup 25 is moved to the outside according to the rotation, it is possible to sequentially reproduce.

After the reproduction of this surface is completed, the upper surface (second surface) 14
When reproducing, the pickup 26 on the upper side is used. This may be a pickup different from the lower pickup 25, or the lower pickup 25 may be moved upward. When the upper pickup 26 is placed at the information reproduction start position (inner circumference), the rotation of the motor does not change clockwise, so the spiral track on the second surface of the optical pickup 26 faces outward and the pickup 26 rotates. Normal reproduction is possible by moving it to the outside according to.

In the above-mentioned embodiment, the case of the spiral track has been described, but the same applies to the case of the concentric track as shown in FIG. At this time, the recording direction of the information signal may be clockwise on the first surface as shown in (a), and may be counterclockwise on the second surface as in (b). In (a), the first track 32 of the information signal is at the innermost circumference, and the tracks sequentially move to the outside. The same applies to (b).

In the conventional double-sided reproduction board, since the rotation direction information is not detected, the motor may be controlled to rotate to the right when reproducing the first surface and to rotate to the left when reproducing the second surface. On the other hand, since the rotation information can be read at the beginning of reproduction in the double-sided reproduction board of the present invention, the rotation direction of the motor may be kept constant when this information is detected. In particular, when the reproduction is switched from the first surface to the second surface, the rotation direction information has already been read at the time of the first surface reproduction, so that the second surface reproduction can be performed with no time loss.

Further, in order to further increase the operation speed,
In order to distinguish whether it is the information disc of the present invention or the conventional information disc before starting the rotation, for example, a label of a double-sided reproduction disc (the rotation direction is fixed by this code) and a first face are used. The code on the first side may be recorded as the barcode 52 or 53. This cord may be in the circumferential direction as shown in FIG. 5 or may be in the radial direction as shown in (b). It is also possible to detect the direction of rotation by reading this with an optical licensor or the like before the rotation of the information disk or by inserting it on the surface of the turntable and starting rotation.

Here, in the above-mentioned embodiment, the reproducing apparatus has two optical pickups provided on the upper and lower sides. However, in particular, in the double-sided reproducing apparatus having a mechanism for moving one reproducing pickup from the front surface to the back surface. ,I can not cope. That is, after the reproduction of the front surface is completed at the outer periphery, the pickup must be moved to the rear surface outside the information disk and further to the innermost periphery for reproducing the rear surface. In this case, this movement time cannot be eliminated and an interruption time occurs.

Therefore, an embodiment designed to solve this problem will be described below. First, in FIG. 6, (a) shows the information signal train 62 on one side. The start 63 of the information is located in the innermost circumference and is recorded in a clockwise spiral shape toward the outer circumference. (B) shows the other information surface 64, which is recorded from the outermost circumference 66 to the inner circumference in a left-handed spiral 65. These two information disks are attached to each other with the surface on which the recording / reproducing light beam is incident facing outside.

FIG. 7 shows the operation of the device for double-sided recording / reproduction using this information disk. Double-sided information disk 21 to motor 2
It is placed on a turntable 23 which rotates together with 2, and fixed by a chatting 24, and the motor 22 is rotated clockwise. When reproducing the first surface 61 on the lower side, the optical pickup 25 placed on the lower side is moved to the innermost start position and reproduction is started from that position. As described with reference to FIG. 6, since the signal train (track) on the first surface is a right-handed spiral that faces outward, if the optical pickup 25 is moved outward as the information disk 21 rotates, the signals are sequentially reproduced. It is possible.

After the reproduction of the first surface is completed, the upper second surface 6
When reproducing No. 4, the optical pickup 25 'moving upward is used. This optical pickup 25 is an information disk 2
Outside of 1, it rises from the lower side to the upper side and is placed at the reproduction start position (outer periphery) of the second surface 14. At this time as well, the motor 22 is rotating clockwise as before, so the pickup 2
For 5 ', the spiral is inward. Therefore, in this state, normal reproduction can be performed by moving the optical pickup 25 toward the inner circumference in accordance with the rotation.

In the above embodiments, the case of the spiral track has been described, but the same applies to the case of the concentric track as shown in FIG. At this time, on the first surface, the signal train is recorded clockwise from the inner circumference 33 as shown in (a), and on the second surface, the signal train is recorded from the outer circumference 35 to the left as shown in (b). Good.

Although the reflection type information disk has been described as an example here, the same effect can be obtained with a transmission type information disk. Further, the present invention can be applied to various recording forms such as phase change and state change recording other than the uneven information recording.

Further, in order to perform recording / reproduction by the conventional double-sided reproduction disc and the information recording / reproduction disc of the present invention, the recording device and the information recording / reproduction disc of the present invention can record the codes of the rotation direction and the information start position on the information disc of the present invention. You can also That is, FIG.
As shown in, the information start position (hard-in area) or information end position of this information recording / reproducing disc, or the rotation direction (or the code of the continuous reproducing disc) in the code information area in which the address or the like is inserted, and Record the information start position code. In the conventional double-sided reproduction board, since the code of the rotation direction and the information starting position described above cannot be read, the motor is rotated to the right when reproducing the first surface, and the motor is rotated to the left when reproducing the second surface. Also,
The playback pickup always moves the inner circumference first and starts from that point.

In the double-sided information continuous recording / reproducing disc of the present invention, the rotation direction and the information start information can be read at the beginning of reproduction (at least when reproducing the first surface). Therefore, when this is detected, the rotation of the motor is always constant. After the first surface is finished, the pickup is controlled to move from the outer circumference of the first surface to the outer circumference of the second surface when the reproduction is switched to the second surface. Since this switching time is short, continuous reproduction is possible with little interruption in time.

As described above, the signal train direction of the spiral or concentric track is right-handed and the information disk from the inner circumference to the outer circumference is bonded to the information disk and the left-handed information disk is bonded from the outer circumference to the inner circumference. It goes without saying that a combination of the above, that is, the information disk from the outer circumference to the inner circumference in the right winding and the information disk from the inner circumference to the outer circumference in the left winding may be attached.

The information disc can be applied to various recording forms such as a state change recording such as a phase change and a continuous track for additional recording as well as the concave and convex information recording.

Further, in FIG. 7, the optical pickup 25 is provided with a means 70 for rotating the optical pickup and a means 71 for moving the optical pickup up and down along a support 72 in order to realize the movement to 25 '. However, the present invention is not limited to this embodiment, and for example, a method of rotating the optical pickup 25 in a fan shape may be used. Further, a method of using a lens system below the optical pickup may be used without using the means 70 for rotating the optical pickup up and down. In this case, an extra lens is required, but the optical system can be shared.

According to this embodiment, when switching from the first surface to the second surface of the double-sided bonded information disk for reproduction, the information disk is not rotated in the reverse direction, and one pickup is switched and moved. However, since the moving distance can be shortened, temporal interruption can be reduced and continuous reproduction can be performed.

[0029]

As described above, according to the present invention, it is possible to eliminate the time interruption when continuously reproducing the information disks of the two surfaces bonded together.

[Brief description of drawings]

FIG. 1 is a diagram showing an information disk recording mode according to the present invention.

FIG. 2 is a diagram showing an operation of the information disc reproducing apparatus of FIG.

FIG. 3 is a diagram showing another embodiment according to the present invention.

FIG. 4 is a diagram showing an example of inserting a rotation direction code.

FIG. 5 is a diagram showing an embodiment of another rotation direction code.

FIG. 6 is a diagram showing an information disk recording mode according to the present invention.

FIG. 7 is a diagram showing an operation of the information disc reproducing apparatus shown in FIG. 6;

[Explanation of symbols]

 11, 14, 61, 64 ... Information disk 12, 15, 62, 65 ... Signal train 21 ... Laminating information disk 22 ... Motor 23 ... Turntable 25, 25 ', 26 ... Pickup

Claims (4)

[Claims] 1. An information reproducing board having an information surface of a first surface on which an information signal is recorded as an uneven information signal sequence and an information surface of a second surface on which an information signal is recorded as an uneven information signal string. And the start point of the information signal sequence of the information surface of the first surface is on the innermost circumference, and is recorded toward the outer periphery in a spiral or concentric pattern, and the reproduction of the information signal sequence of the information surface of the second surface is performed. An information reproducing board having a starting point on the outermost circumference and being recorded spirally or concentrically toward the inner circumference. 2. The rotation direction information of the information signal sequence or the identification information of the information reproducing board is recorded on the information surface of the first surface and the information surface of the second surface. The information reproduction board described in the first section. 3. A first information disc having a first information surface on which an information signal is recorded as an uneven information signal sequence, and a second information surface on which an information signal is recorded as an uneven information signal sequence. And a second information disc having: a first information disc, the first information disc of the first information disc, the information signal sequence starting point is the innermost periphery, and the outer periphery is spiral or concentric. The double-sided information reproduction is performed toward the inner circumference in a spiral or concentric manner, with the starting point of the reproduction of the information signal sequence on the second information surface being the outermost circumference. Board. 4. The rotation direction information of the information signal train or the identification information of the double-sided information reproducing disc is recorded on the first information disc and the second information disc. A double-sided information reproducing board described in item 3.