JPH02103731A - Double-sided optical disk and double-sided optical disk device - Google Patents

Abstract

PURPOSE:To continuously record and reproduce both sides and to simultaneously record and reproduce both sides by making the information recording direction for one side and the information recording direction for the other side reverse to each other in their directions. CONSTITUTION:One side optical disk 10 as the surface of the double-sided optical disk 14 is recorded counterclockwise with track numbers and sector numbers. On the contrary, the other side optical disk 12 as the back of the double-sided optical disk 14 is recorded counterclockwise with track numbers and sector numbers. That is, the sector numbers of one side optical disk 10 to be the surface are increased counterclockwise from a reference position, while the sector numbers of the other side optical disk 12 to be the rear are increased clockwise from a reference position. Moreover, the numerical strings showing the sector numbers on the surface and the rear respectively are reverse to each other. By this method, both sides 10 and 12 can continuously be recorded and reproduced, and both sides can simultaneously be recorded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double-sided photon disk capable of recording information on both sides, and a double-sided optical disk device for recording and reproducing the double-sided optical disk.

[Prior Art] Current optical discs are mainly single-sided optical discs that can record and play back only on one side, such as those found in CDs and LDs, but due to the demand for larger capacity, it is now possible to record information on both the front and back sides. Double-sided optical discs are attracting attention. however,
Conventional double-sided optical discs were simply made by pasting together single-sided optical discs.9 Therefore, even if an optical head is installed on the back side of a conventional double-sided optical disc, the direction of rotation of the double-sided optical disc as seen from the optical head is opposite to that of the front side. , recording and playback were not possible. However, conventional optical disk devices are provided with an optical head only on one side, and when recording and reproduction on the front side of a double-sided optical disk is completed, the double-sided optical disk is turned over and recording and reproduction is performed on the back side.

``Problems to be Solved by the Invention'' In this way, the conventional double-sided optical disk is simply a combination of conventional single-sided optical disks. It was not possible to record or play back both sides at the same time.

The present invention has been made in consideration of the above circumstances, and provides a double-sided optical disc capable of recording and reproducing information on both sides continuously or simultaneously, and a double-sided optical disc device for recording and reproducing the double-sided optical disc. The purpose is to provide

[Means for Solving the Problems] The object of the present invention is to provide a double-sided optical disc in which information can be recorded on both sides, characterized in that the information recording direction on the - side and the information recording direction on the other side are opposite to each other. Achieved by double-sided optical discs.

The above objects include a driving means for rotating a double-sided optical disc, a single-sided optical head for recording and reproducing one side of the double-sided optical disc;
This is achieved by a double-sided optical disc device comprising a second-side optical head for recording and reproducing information on the other side of the double-sided optical disc. .

[Function] Since the present invention is configured as described above, it is possible to record and reproduce on both sides continuously or simultaneously on both sides.

[Example] Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 shows a double-sided optical disc according to an embodiment of the present invention. The double-sided optical disc of this embodiment includes a single-sided optical disc 10 shown in FIG. 1(a) and a single-sided optical disc 1 shown in FIG.
The double-sided optical disk 14 shown in FIG.

Figure 1 shows a double-sided optical disc 1 when rotating clockwise.
4 is shown. On the single-sided optical disc 10, which is the front surface of the double-sided optical disc 14, track numbers and sector numbers are recorded counterclockwise as shown in FIG. 1(a). On the other hand, on the single-sided optical disc 12, which is the back side of the double-sided optical disc 14, track numbers and sector numbers are recorded counterclockwise as shown in FIG. 1(C). That is, the sector number of the single-sided optical disc 10 that is the front side increases counterclockwise from the reference position as "1", "2", "3", etc., and the sector number of the single-sided optical disc 12 that is the back side increases clockwise from the reference position by "1", "2", "3", etc. Moreover, the numerical strings indicating sector numbers are reversed between the front and back sides.

In addition, in this embodiment, the first
As shown in Figures (a) and (C), track numbers are assigned increasing from the outside to the inside. Note that the track numbers may be assigned in the opposite manner on the front and back sides.

That is, on the single-sided optical disc 10 serving as the front side, the track number is increased by one inch from the outside to the inside.
On the other hand, on the single-sided optical disc 12 serving as the back side, track numbers are assigned so as to increase from the inside to the outside.

Next, the details of each sector's information are shown in Figure 1 [b) and fd).
Explain using. FIG. 1(b) shows a single-sided optical disc 10.
It shows the details around sectors 1 and 2 of a certain track, and
FIG. F(1) shows details of the vicinity of sectors 1 and 2 of a certain track of the single-sided optical disc 10. FIG. In each sector, a track number, a sector number, and data are recorded in this order. A pit indicating a track number and a sector number, along with a pit (group) indicating a track position, is made in advance as a pre-focus when manufacturing an optical disk.

As can be seen from FIG. 1(b), in the single-sided optical disc 10, the sector numbers are arranged so that they increase in a counterclockwise direction, and the numerical strings indicating the trunk number and sector number themselves are also recorded in a counterclockwise direction. ing. That is, the first
As shown in figure [b], do not enter the track number.roooo
. . 001" and "0010" indicating the sector number are arranged counterclockwise on the track, that is, from right to left. Conversely, in the single-sided optical disc 12 shown in FIG. 1(d), the sector numbers are arranged so as to increase clockwise, and the numerical strings indicating the track numbers and sector numbers themselves are also recorded clockwise. . That is, as shown in FIG. 1(d), "rl 111...111" indicating the trunk number and ro indicating the sector number.
The data of oloJ is arranged counterclockwise on the 1-rack, that is, from left to right.

The thus manufactured single-sided optical disc 10 and single-sided optical disc 12 are bonded together to create a double-sided optical disc 14. The single-sided optical disc 12 on the back side is turned over so that the bottom side becomes the data side, and is bonded to the single-sided optical disc 10. Ru.

FIG. 2 is a diagram showing a double-sided optical disc device for recording and reproducing the double-sided optical disc of FIG. 1.

The motor 20 rotates the double-sided optical disc 1-1.

The double-sided optical disc 14 is attached to the rotating shaft of the motor 2o by a clamp 22. In this embodiment, the motor 20 rotates the double-sided optical disc 14 clockwise.

Optical heads 24 and 26 are provided on the front and back surfaces of the double-sided optical disc 14, respectively.

The optical head 24 is for recording and reproducing the surface of the double-sided optical disc 14, and the optical head 26 is for recording and reproducing the surface of the double-sided optical disc 14.
This is for recording and reproducing the back side of 4. optical head 2
4 and 26 are each independently subjected to 1 to runo kink control and focus zinc control. It is desirable that the optical head 24 and the optical head 26 be controlled alternately by time division.

In this way, using the optical heads 24 and 26, it is possible to continuously record and reproduce data on both sides of the double-sided optical disc 14 without turning it over midway, or to record and reproduce data on both sides at the same time. be.

The present invention is not limited to the above embodiments, and various modifications are possible.

For example, in the above embodiment, the double-sided optical disc is rotated clockwise, but may be rotated counterclockwise. In that case, data is recorded in a clockwise direction on the single-sided optical disk serving as the front side, and data is recorded in a counterclockwise direction on the single-sided optical disk serving as the back side. In any case, the information recording direction on the front surface and the information recording direction on the back surface are opposite to each other.

In addition, the embodiment described in L was about a double-sided optical disc in which information was recorded and reproduced in concentric circles, whereas the recording and reproduction of information in J-Keiho was performed in a spiral pattern. The present invention can also be applied to double-sided optical discs. In the case of a double-sided optical disc in which recording and reproduction are performed along spiral tracks, the track numbers and sector numbers are in opposite directions on the front and back sides, and the spiral shapes are also opposite on the front and back sides. That is, for example, in the case of a double-sided optical disc with a spiral track that rotates clockwise, the single-sided optical disc on the front side has a spiral track counterclockwise from the center, and the single-sided optical disc on the back side has a spiral track clockwise from the center. It becomes a tou and tsuku of the state.

Further, although the double-sided optical disc apparatus of the above embodiment can record and reproduce only one double-sided optical disc, it may be configured to record and reproduce a plurality of double-sided optical discs. A plurality of double-sided optical disks are all rotated by one motor, and optical heads that can be independently controlled are provided on the front and back surfaces of each double-sided optical disk.

Furthermore, the present invention is applicable to all kinds of read-only optical discs such as CDs and LDs, write-once optical discs that can be recorded many times, and rewritable optical discs that can be recorded many times (magneto-optical discs, phase change optical discs, etc.). Applicable to optical discs.

[Effects of the Invention] As described above, according to the present invention, the information recording direction on one side of the double-sided optical disc and the information recording direction on the other side are opposite to each other, and optical heads are provided for each of both sides.
It is possible to record and reproduce both sides continuously or simultaneously.

[Brief explanation of drawings]

FIG. 1 is a diagram that does not show a double-sided optical disc according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a double-sided optical disc apparatus according to an embodiment of the present invention. 10... Single-sided optical disc (for the front side), 12... Single-sided optical disc (for the back side), 14... Double-sided optical disc, 20... Motor 22... Clamp, 24... Optical head (for the front side) 26...Optical head (for back side)

Claims (1)

[Claims] 1. A double-sided optical disc capable of recording information on both sides, characterized in that the information recording direction on one side and the information recording direction on the other side are opposite to each other. 2. A double-sided optical disc device for recording and reproducing the double-sided optical disc according to claim 1, comprising: a driving means for rotating the double-sided optical disc; a single-sided optical head for recording and reproducing one side of the double-sided optical disc; A double-sided optical disc device comprising a back side optical head for recording and reproducing information on the back side.