JPH01286129A - Duplex optical disk medium and optical disk device - Google Patents

Abstract

PURPOSE:To perform a recording and reproducing operation on both planes of an optical disk simultaneously and successively by using a duplex disk in which two bases formatted in mirror symmetry are stuck setting a formatted plane to the outside. CONSTITUTION:In a duplex optical disk medium 26, a plane A27 and a plane B28 are constituted by sticking two substrates formatted in the mirror symmetry in back to back setting the formatted plane to the outside. The recording and reproduction of the planes 27 and 28 are performed by using optical heads 35 and 36, respectively. Thereby, even when either plane of the medium 26 is loaded on a turntable, the recording and reproduction of the plane A27 and the plane B28 can be executed successively without changing the rotating direction of the disk by selecting the rotating direction of a spindle motor 38 based on the detecting state of ID information.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an optical disk medium and an optical disk device, and more specifically to a double-sided optical disk medium and a double-sided optical disk medium that can be used to perform information recording and reproducing operations at high speed. The present invention relates to an optical disc device.

(Prior Art) FIG. 5 shows a cross-sectional view of a conventional double-sided optical disk medium in which recording and reproduction can be performed on both the front and back sides.

In the same figure, 1 and 2 are acrylic resin (PMM^)
The substrate is made of a resin with excellent transparency and low birefringence, such as polycarbonate resin, or a glass plate. Due to the uneven shapes of the substrates 1 and 2, header areas (not shown) of sectors in which track numbers, sector numbers, timing information, etc. are stored, guide grooves, etc. are pre-formatted. 3 and 4 are recording layers, and the materials of this recording device include organic substances, dyes, and Bi.
Although chalcogen compound thin films are also being considered, thin films containing Te as a main component are mainly used. 5, 6, 7 and 8 are protective films provided for the purpose of preventing oxidation of the recording layers 3 and 4. Reference numeral 9 denotes an adhesive film, and this adhesive film 9 is used to ink the recording films 3 and 4 from the same master disc through a transfer process, etc., and the protective films 5 and 6.
Two substrates 1 and 2 provided with 7 and 8 are pasted together back to back. The outer surfaces of substrates 1 and 2 may be coated for the purpose of protecting the substrates. In this case, the coating is made of a hard transparent material so that the Reger light used for recording and reproducing information can pass therethrough.

(Problem to be Solved by the Invention) Figure 6 shows the front and back sides of a double-sided optical disc medium.
FIG. 6 is an explanatory diagram when surfaces are accessed simultaneously or alternately.

10 is a conventional double-sided optical disk medium, 11 is one side (A side) of the double-sided optical disk medium 10, 12 is the other side (B side) of the conventional double-sided optical disk medium 10, and 13 is A of the optical disk medium.
14 is an optical head arranged against the B side of the optical disc medium; 15 is a spindle rotation shaft; 16 is a spindle motor that rotates the double-sided optical disc medium 10 via the spindle rotation shaft 15; , 17 is a spindle drive circuit that drives the spindle motor 16;
18 is a sector on side A of the double-sided optical disc medium, 19 is a header area of sector 18, 20 is a data area of sector 18,
21 is a sector on the B side of the double-sided optical disc medium, 22 is the header area of the sector 21 on the B side, 23 is the data area of the sector on the B side, 24 is the clockwise rotation direction when viewed from above the A side 11, and 25 is the sector The counterclockwise rotation direction is shown when viewed from above the A side 11.

As is clear from FIG. 6, the double-sided optical disc medium lO
When performing a recording or reproducing operation on the sector 18 of the A side 11 using the optical disc 13, the rotation direction of the spindle motor 16 is clockwise rotation direction 2 when viewed from above the A side 11.
Must be 4. That is, the optical head 13 must pass through the header area 19 of the sector 18 and then the data area 20 of the sector 18 .

Conversely, sector 2 on the 8th side 12 of the double-sided optical disc medium 10
1, when recording or reproducing using the optical head 14, the rotation direction of the spindle motor 16 is the A-plane 11.
The direction of rotation must be counterclockwise 25 when viewed from above. That is, the optical head 14 must pass through the header area 22 of the sector 21 and then the data area 23 of the sector 21.

In this way, the A sides 11 and 8 of the double-sided optical disc medium 10
In order to correctly record and reproduce information on the surface 12, the disk rotation direction must be opposite. Therefore, when accessing the eighth side 12 after the A side 11 with the double-sided optical disc medium 10 attached, the spindle motor 16 is rotated in the clockwise rotation direction 24 to perform recording and reproduction on the A side 11. Thereafter, it is necessary to execute a sequence in which the spindle motor 16 is stopped once and then started again in the reverse direction, that is, in the counterclockwise rotation direction 25, to perform recording and reproduction on the eight surfaces 12. That is, simultaneous recording and reproduction of the A side 11 and the 8th side 12 is impossible, and the opposite side can only be accessed after the spindle motor 16 has stopped and started to rotate in reverse. Normal spindle motor startup/
Each stop takes about 1 second. This value is 100m
This is much longer than the seek time of an optical head, which is about 5 seconds, or the data transfer time for one sector, which is several milliseconds, and has a serious negative effect on the throughput of the optical disk device.

On the other hand, if the rotation direction of the spindle motor 16 is constrained to be constant, it is natural that the double-sided optical disk medium 1
0 must be removed from the spindle motor 16, the medium surface reversed, and then reinstalled, and the medium reversal time is added to the startup/stop time of the spindle motor 16, resulting in a significant time loss.

Therefore, as long as conventional double-sided optical disc media are used, it is impossible to access both sides of the optical disc at the same time or immediately, and in practice it has the extremely serious problem that it only functions as a single-sided optical disc medium. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the conventional problems and provide a double-sided optical disc medium capable of high-speed recording and reproduction on both the front and back sides, and an optical disc device using a double-sided optical disc.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a system in which two substrates each having a recording film that is recorded or reproduced by a light beam and which are formatted in mirror symmetry are It is characterized by being pasted together with the formatted side facing outward.

The present invention also has a recording film which is recorded or reproduced by a light beam, and which is mirror-symmetrically formatted.
This is an optical disk device using a double-sided optical disk medium in which two substrates are pasted together with the formatted side facing outward, and includes a double-sided optical head, an optical head disposed on both the front and back surfaces of the disk medium, and a double-sided optical disk medium. The present invention is characterized by comprising a recording/reproducing means for performing recording/reproducing on each of two sides of a double-sided optical disc medium using an optical head by rotating the optical disc medium in only one direction.

The present invention further includes a recording film which is recorded or reproduced by a light beam, and which is mirror-symmetrically formatted.
An optical disk device using a double-sided optical disk medium in which two substrates are pasted together with the formatted side facing outward, and includes an optical head disposed on each of the front and back surfaces of the double-sided optical disk medium, and an optical head disposed on each side of the double-sided optical disk medium. an identification means for identifying the front and back sides and outputting a true or false signal; a reversing means for reversing the rotational direction of the double-sided optical disk medium when the output signal of the identification means is false; and an optical head. The present invention is characterized by comprising a recording/reproducing means for performing recording/reproducing on two sides of a double-sided optical disc medium.

The present invention further provides a double-sided optical disk medium in which two mirror-symmetrically formatted substrates, each having a recording film that is recorded or reproduced by a light beam, are pasted together with the formatted surface facing outward. An optical disk device using a double-sided optical disk medium, an optical head disposed on one side of a double-sided optical disk medium, an identifying means for identifying the front and back sides of the double-sided optical disk medium, and outputting a true or false signal, and an identifying means. a reversing means for reversing the rotational direction of the double-sided optical disk medium when the output signal of the double-sided optical disk medium is false; and a recording/reproducing means for performing recording and reproduction on one side of the double-sided optical disk medium using an optical head. It is characterized by

[Effect]

According to the present invention, since the front and back sides of a double-sided optical disk medium are formatted mirror-symmetrically, when recording and reproducing operations are performed simultaneously or continuously and alternately on both sides, it is necessary to take out the medium once and turn it over, or rotate the disk. This means that it can be executed immediately without reversing direction.

(Example〕 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the double-sided optical disc medium of the present invention. In the figure, 26 is a double-sided optical disc medium, 27 is one side (side A) of the double-sided optical disc medium 26, and 27 is a double-sided optical disc medium 26.
8 is the other side (B side) of the double-sided optical disk medium, 29 is a sector on side A 27, 30 is a header area of sector 29, 31 is a data area of sector 29, 32 is a sector on side 8 28, 33 is the header area of the sector 32, and 34 is the data area of the sector 32.

The double-sided optical disk medium 26 has an A side 27 and an 8th side 28 formed by laminating two mirror-symmetrically formatted substrates back to back with the formatting surfaces facing outward. As is well known, tracks are formed on an optical disk medium, and sectors each consisting of a header area and a data area are formed along the tracks.

Since the double-sided optical disc medium has such a structure, by rotating the double-sided optical disc medium 26 in the same direction, side A 27 and side 8 28 can be sequentially recorded and reproduced in the order of sector header area and data area. It becomes possible.

FIG. 2 is a block diagram of an embodiment of an optical disc device using the optical disc medium of the present invention. In this figure, the same reference numerals as in FIG. 1 indicate the same parts, and the explanation will be omitted. 35 is an optical head arranged for the A side 27, 36 is the 8th side 28
37 is a spindle. 38 is a spindle motor, 39 is a spindle motor drive circuit for driving the spindle motor, 40 is the rotation direction of the spindle motor, and 41 is a 10-times detection circuit.

First, the double-sided optical disc medium 26 is placed on the turntable.
is installed as shown in Figure 2. A side 27
An optical head 35 is used for recording and reproducing the header area 30 and data area 31 of the sector 29. 8 sides 28 sector 3
For recording and reproducing the header area 33 and data area 34 of 2,
An optical head 36 is used. Through the optical head 35, ID information, which is track and sector address information of the double-sided optical disk medium 26, is sent to an ID detection circuit 39 that extracts it from the reproduced signal. The accurately read 10 information is sent to a control circuit (not shown). Further, a detection signal indicating whether or not 10 has been detected is input to the spindle motor drive circuit 39. The spindle motor drive circuit 39 maintains the rotation state of the spindle motor 38 if the detection signal is "true" in a state where information can be read from the optical head 35 after the spindle motor 38 reaches a steady rotation state. If the detection signal is "false", the direction of rotation of the spindle motor 64 is reversed, so the spindle motor 64 is first stopped and then started again in the opposite direction to bring it into a steady rotation state. Note that the sending route of the start/stop control command signal, etc. to be sent from the control unit of the entire optical disk device to the spindle motor drive circuit is as follows.
The explanation will be omitted here.

With such a configuration, no matter which side of the double-sided optical disk medium 26 is mounted on the turntable, the spindle motor 38 is activated based on the detection state of the ID information.
By selecting the direction of rotation, recording and reproduction of side A 27 and side 8 28 can be performed simultaneously.

Needless to say, even in a case where the optical heads are arranged on both sides of the double-sided optical disc medium surface and the mounting surface of the double-sided optical disc medium on the turntable is limited, recording can be performed simultaneously on both sides in a fixed disc rotation direction. Reproduction is possible.

Further, even in the case where the optical head is disposed only on one side of the double-sided optical disc medium surface, recording and reproduction can be performed in exactly the same manner as in the embodiment described above.

Note that the double-sided optical disc medium is covered in a disc case.

3 and 4 are a top perspective view and a bottom perspective view, respectively, of a disk case having two mounting surfaces, front and back, for the turntable of the spindle motor. In both figures, 42 is a cartridge body, 43 is an optical disk medium, 44 is a shutter, and 45 is a spindle hub.

FIG. 3(^) shows a situation in which the shutter is closed to cover the optical disk medium, and FIG. 3(B) shows a situation in which the shutter is opened to expose the optical disk medium. Fourth
FIG. 4(A) shows a situation in which the shutter is closed and the optical disk medium is covered, and FIG. 4(B) shows a situation in which the shutter is opened to expose the optical disk medium.

In the above-mentioned disk case, a disk case having two mounting surfaces, front and back, has been described, but it goes without saying that the mounting surface of the spindle motor to the turntable may be limited to one surface.

It goes without saying that the present invention is applicable regardless of the recording/reproducing principle, material, composition, etc. of the optical disc medium.

In addition, it shall be applicable regardless of the type and structure of the preformat pattern, which consists of ladder patterns such as sector addresses, track addresses, and synchronization patterns, and servo patterns based on servo systems such as groove servo and sample servo. is self-evident. Of course, the tracks may be spiral or concentric.

Furthermore, whether the double-sided optical disc medium is front or back may be determined from the physical shape of the disc case or the like. Furthermore, it may be displayed on the double-sided optical disc medium itself for confirmation.

Furthermore, the method of laminating the substrates forming both sides may be any method such as a close contact structure or an air sandwich structure.

〔Effect of the invention〕

As explained above, according to the present invention, since the front and back sides of a double-sided optical disk medium are formatted in mirror symmetry, when recording and reproducing operations are performed simultaneously or continuously and alternately on both sides, the medium is This means that the disc can be executed immediately without having to take it out and turn it over or reverse the direction of rotation of the disc.

As a result, access processing when one file spans both the front and back sides, and operations such as transcription and movement between the front and back sides can be executed at high speed and with high efficiency, which is an extremely important practical advantage.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a double-sided optical disc medium of the invention, FIG. 2 is a block diagram of an embodiment of an optical disc device of the invention, and FIGS. 3(A) and (B) are optical discs of the invention. FIG. 4 (^) and (B) are perspective views of the disk case used in the optical disk device of the present invention, and FIG. 5 is a cross-sectional view of a conventional double-sided optical disk medium. FIG. 6 is a block diagram of the optical disc device of the present invention. 1.2... Substrate, 3.4... Recording layer, 5.6, 7.8... Protective film, 9... Adhesive film, lO... Double-sided optical disc medium, 11... One side (side A) of a double-sided optical disc medium, 12
...One side (B side) of a double-sided optical disc medium, 13.1
4... Optical head, 15... Spindle rotation axis, 16... Spindle motor, 17... Spindle drive circuit, 18... Sector, 19... Header area, 20... Data area, 21... Sector, 22... Header area, 23... Data area, 24... Clockwise rotation direction, 25... Counterclockwise rotation direction, 26... Double-sided optical disc medium, 27...One side (side A) of double-sided optical disc medium, 28
...One side (B side) of a double-sided optical disc medium, 29...
- Sector, 30...Header area, 31...Data area, 32...Sector, 33...Header area, 34...Data area, 35.36...Optical head, 37... Spindle, 38...Spindle motor, 39...Spindle motor drive circuit, 40...Rotation direction of spindle motor, 41...-I[1 detection circuit, 42...Cartridge body, 43...Optical disc Medium, 44...Shutter, 45...Spindle hub. Patent applicant Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] 1) Two substrates each having a recording film that is recorded or reproduced by a light beam and formatted in mirror symmetry are bonded together with the formatted surfaces facing outward. double-sided optical disc media. 2) An optical disc device using the double-sided optical disc medium according to claim 1, comprising: an optical head disposed on each of the front and back surfaces of the double-sided optical disc medium; and by rotating the double-sided optical disc medium in only one direction. , using the optical head to record two double-sided optical disc media.
1. An optical disc device comprising: recording and reproducing means for performing recording and reproducing on each surface. 3) An optical disk device using the double-sided optical disk medium according to claim 1, further comprising: an optical head disposed on each of the front and back surfaces of the double-sided optical disk medium; identification means for outputting a false signal; reversing means for reversing the rotational direction of the double-sided optical disc medium when the output signal of the identification means is false; 1. An optical disc device comprising: recording/reproducing means for performing recording/reproducing on a surface. 4) An optical disc device using the double-sided optical disc medium according to claim 1, comprising: one optical head disposed on one side of the double-sided optical disc medium; and the identification means according to claim 3; 4. An optical disc device comprising: the reversing means according to claim 3; and a recording/reproducing means for performing recording/reproducing on one side of the double-sided optical disc medium using the optical head.