JPH04368671A - Optical disk and optical disk driving device - Google Patents

Abstract

PURPOSE:To attain the high speed of the data transferring speed of a system using the optical disk of a both face access type by shorten retrieval seeking time required to read directory information. CONSTITUTION:The directory information 1-1, 1-2, 1-3... of data files 1-1, 1-2, 1-3... recorded to one side of two optical disk mediums 1, 2 constituting with the optical disk of the both face access type are recorded to the other optical disk medium. Concerning with an optical disk driving device, a controller is constituted so that information is recorded to the optical disk by the above- mentioned system and reproduced from the optical disk where the information is recorded by the above-mentioned system.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided access optical disc and an optical disc drive, and more particularly to a data file and an arrangement method for directory information necessary for reproducing the data file.

0002

BACKGROUND OF THE INVENTION Double-sided recording optical discs currently available on the market consist of two optical disc media (A-side disc, and B-side disc) are assembled concentrically with the information recording layer inside, and is equipped with only one recording/reproducing head, and an optical disc drive that rotates the optical disc in only one specific direction. The optical disc is mounted in an appropriate inverted state, and information is recorded/reproduced on either one of the optical disc media facing the head. In an optical disc system consisting of this type of optical disc and an optical disc drive device,
Since the head cannot access the A-side and B-side disks at the same time, it takes a long time to read the information recorded on each optical disk medium. It is much more disadvantageous than

On the other hand, in a double-sided access disk, disks for side A and side B, on which preformat patterns are formed so that the information recording directions are opposite to each other, are assembled concentrically with the information recording layer inside. This double-sided access type optical disc can be removably installed, and the A-side head records/reproduces information on the A-side disc, and the A-side head records/reproduces information on the B-side disc. An optical disc drive device equipped with a B-side head that performs the following has been proposed. According to this type of optical disc system consisting of an optical disc and an optical disc drive device, a double-sided access type optical disc is loaded into the optical disc drive device facing in a predetermined specific direction, and this optical disc is placed in a predetermined specific direction. By rotating in the direction of
The optical head can access both the A-side and B-side disks simultaneously.

[0004] As a method of using an optical disc system using this double-sided access type optical disc, for example, as described in Japanese Patent Laid-Open No. 2-143925, video information is stored on the A-side disc and music information is stored on the B-side disc. One idea is to record information and simultaneously play back video information and matching music information. This optical disc system does not take into consideration technology to improve data transfer speed by increasing head access speed, and the A-side disc contains video information and directory information necessary for playing the video information. Music information and directory information necessary for reproducing the music information are recorded on the B-side disc.

[0005]

SUMMARY OF THE INVENTION In order to increase the data transfer speed of an optical disk system, it is effective to shorten the seek time required to read directory information. However, as mentioned above, in an optical disk system using a conventional double-sided access type optical disk,
The A-side disc contains video information and the directory information necessary to play the video information, and the B-side disc contains music information and the directory information necessary to play the music information. When attempting to repeatedly read different video information or music information from different data file recording areas of a disc and a B-side disc, the head must repeatedly seek to the directory information recording area and the data file recording area. ineffective.

The present invention has been made in order to solve the deficiencies of the prior art, and it shortens the search seek time required for reading directory information, and improves data transfer in an optical disk system using a double-sided access type optical disk. The purpose is to further increase the speed.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides two optical disc media on which preformat patterns are formed so that information recording directions are opposite to each other. In a double-sided optical disc that is assembled concentrically and allows information to be recorded/reproduced simultaneously on both optical disc media by individually accessing the head for each optical disc medium, one of the two optical disc media The directory information of the data file recorded on the optical disk was recorded on the other optical disk medium.

In this case, the directory information can be recorded only on an optical disk medium other than the optical disk medium on which the data file is recorded, or it can be recorded on both the optical disk medium on which the data file is recorded and the other optical disk medium. You can also do it.

[0009] The optical disk drive device also includes a spindle motor that removably attaches and rotates a double-sided access type optical disk, and a spindle motor that rotates a double-sided access type optical disk that is attached to the spindle motor and is arranged on both sides of the spindle motor. In an optical disk drive device that includes first and second heads and a controller that controls these first and second heads, when recording information, the first and second heads
drive one of the second heads to read the directory information of the data file recorded on one of the optical disk media constituting the double-sided access type optical disk; When reproducing information, one of the first and second heads is driven to read information from one of the optical disc media constituting the double-sided access type optical disc. The controller was configured to drive the other head based on the directory information and read the data file corresponding to the directory information from the other optical disk medium.

In this case, when recording information, the controller may be configured to record directory information only on an optical disk medium other than the optical disk medium on which the data file is recorded, or the controller may be configured to record the directory information only on an optical disk medium other than the optical disk medium on which the data file is recorded. The controller can also be configured to record directory information on both the other optical disc medium. Of course, in a read-only optical disk drive, the controller is configured so that the function for recording information is omitted.

[0011]

[Operation] When the optical disc system consisting of the optical disc and the optical disc drive device described in the above means is used, the first
and one of the second heads accesses the directory information recording area of the one optical disk medium that the second head faces and reads the directory information of the data file recorded on the other optical disk medium, while The head can access the data file recording area of the other optical disk medium that the head faces and read the data file corresponding to the directory information read by the one head. Since the directory information recording area generally fits within a narrow area, when attempting to continuously search for a plurality of pieces of directory information, the search seek time takes almost no more than the rotational waiting time. Therefore, compared to the case where the head alternately moves back and forth between the directory information recording area and the data file recording area, the search seek time can be significantly reduced, thereby increasing the data transfer speed.

Of course, if both the first head and the second head are driven back and forth between the directory information recording area and the data file recording area, the data can be read from one optical disk medium as in the conventional optical disk system. It is also possible to read, for example, video information from the other optical disc medium, and music information, for example, from the other optical disc medium.

Furthermore, if the directory information of all the data files recorded on the two optical disk media is recorded on both of the two optical disk media constituting the double-sided access type optical disk, the directory information on one side can be When one directory is destroyed, it can be backed up by the other directory information, improving system reliability.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a developed view of an optical disc according to the present invention, and FIG. 2 is an explanatory diagram showing an example of the arrangement of data files and directory information recorded in the recording area of the optical disc.

As shown in FIG. 1, an optical disc 1 of the present invention
0 is constituted by two optical disk media 1 and 2 having the same diameter. In the first optical disc medium 1, a ring-shaped area 3 excluding the innermost and outermost areas is a recording area, and a directory information recording area 4 is provided in the center of the recording area 3, and the directory information is The inner and outer circumferential portions of the recording area 4 are data file recording areas 5. In the recording area 3, data files and directory information are recorded in a recording track formed by a fine preformat pattern (not shown) from the inner circumferential side to the outer circumferential side of the recording area 3, and in the direction shown by an arrow 6. It is preformatted into a spiral shape or a concentric circle shape concentric with the center hole 7 so that the center hole 7 is concentric with the center hole 7.

On the other hand, in the second optical disc medium 2, a ring-shaped area 3a excluding the innermost and outermost peripheries is a recording area, and a directory information recording area is provided near the outer periphery of the recording area 3a. 4a, and the inner and outer circumferential portions of the directory information recording area 4a are data file recording areas 5a. In the recording area 3a, data files and directory information are recorded in a recording track formed by a fine preformat pattern (not shown) from the inner circumferential side to the outer circumferential side of the recording area 3a, and in the direction indicated by an arrow 6a. It is preformatted into a spiral shape or a concentric circle shape that is concentric with the center hole 7a.

Therefore, when these first and second optical disk media 1 and 2 are assembled concentrically, the optical disk 10
When viewed from the respective heads disposed on both sides of the optical disc medium 1 and 2, the information recording direction of the first and second optical disc media 1 and 2 becomes the same, and by rotating the optical disc 10 in one specific direction, It becomes possible to simultaneously record/reproduce information on the first and second optical disc media 1 and 2.

The feature of the optical disc 10 of the present invention is that the directory information of the data file recorded in the data file recording area 5 of the first optical disc medium 1 is transferred to the second optical disc medium 2 as shown in FIG. , and the directory information of the data file recorded in the data file recording area 5a of the second optical disc medium 2 is recorded in the directory information recording area 4 of the first optical disc medium 1. . That is, in the example of FIG. 2, data files 1-1, 1-
2 and 1-3 are recorded in the order of registration, and the directory information recording area 4a of the second optical disc medium 2 contains the data files 1-1, 1 recorded in the data file recording area 5 of the first optical disc medium 1. -2, 1-3 directory information 1-1, 1-2, 1-3 are recorded in the order of registration. On the contrary, data files 2-1 and 2-2 are stored in the data file recording area 5a of the second optical disc medium 2.
, 2-3 are recorded in the order of registration, and the directory information recording area 4 of the first optical disc medium 1 contains the data files 2-1, 2-3 recorded in the data file recording area 5a of the second optical disc medium 2. Directory information 2-1, 2-2, and 2-3 of 2 and 2-3 are recorded in the order of registration. Then, data file 1-3, data file 2-3, directory information 1-3, directory information 2
The area after the area where -3 is recorded is an unrecorded area.

The present invention relates to an arrangement method of information recorded on an optical disc, and the information can be added only once.
Any known type of optical disc, such as a so-called write-once type optical disc that can be used only once, a so-called erasable type optical disc that can erase recorded information and re-record the information in the erased area, and a read-only type optical disc. The present invention can be applied to optical discs having a recording method.

Next, an example of an optical disk drive device for driving the optical disk 10 will be explained with reference to FIGS. 3 to 5. FIG. 3 is a block diagram of the optical disc drive, FIG. 4 is an explanatory diagram of the operation of the optical disc drive during recording, and FIG. 5 is an explanatory diagram of the operation of the optical disc drive during reproduction.

As shown in FIG. 3, the optical disc drive device 20 of this example includes a turntable 11 on which the optical disc 10 is removably mounted, a spindle motor 12 that rotates the optical disc 10 together with the turntable 11, and a spindle motor 12 that rotates the optical disc 10 together with the turntable 11. a first head 13 and a second head 14 arranged on both sides of the head 13 and 14, servo control units 15 and 16 that apply tracking servo and focus servo to each head 13 and 14, and a controller 17 that controls each part of the device. Based on the command from the controller 17,
It includes recording/reproducing sections 18 and 19 that cause the heads 13 and 14 to perform recording and/or reproducing operations.

An example of recording and reproducing operations using the optical disc system comprising the optical disc 10 and the optical disc drive device 20 will be described below with reference to FIGS. 4 and 5. These operations are performed according to control software stored in the controller 17.

At the time of recording, as shown in FIG. 4, in step S-1, the first head 13 is accessed to the beginning of the unrecorded area of the data file recording area of one optical disk medium 1 facing it, and The second head 14 accesses the beginning of the unrecorded area of the data file recording area of the other optical disk medium 2 facing it. Next, the process goes to step S-2, where a data file is written in the area, and it is checked whether the information has been written without error. If an error occurs, head 13 or 14
access the beginning of a new unrecorded area in the data file recording area and write the same information. This operation is repeated until the information can be written without error. If the information can be written in step S-2, the process goes to step S-3 to create directory information necessary to read out the written information. Next, the process goes to step S-4, where the first head 13 is driven to access the beginning of the unrecorded area of the directory information recording area of one optical disk medium 1 facing the first head 13, and the first head 13 is accessed to access the beginning of the unrecorded area of the directory information recording area of one optical disk medium 1 facing the first head 13. Write the directory information of the data file and check whether the information was written without error. At the same time, the second head 14 is driven to access the beginning of the unrecorded area of the directory information recording area of the other optical disk medium 2 facing the second head 14, and access the directory of the data file recorded on the one optical disk medium 1. Write the information and check whether the information was written without errors. If an error occurs, the head 13 or 14 accesses the beginning of a new unrecorded area in the directory information recording area and writes the same information. This operation is repeated until the information can be written without error.

At the time of reproduction, as shown in FIG. 5, in step S-11, the first head 13 is accessed to the directory information recording area of the optical disk medium 1 facing it, and the second head 14 is accessed to the directory information recording area of the optical disk medium 1 facing the first head 13. The directory information recording area of the other opposing optical disc medium 2 is accessed and the directory information recorded in the area is read. Next, the process goes to step S-12, where one head (in this example, the second head 14) for reading the directory information of the desired data file is fixed to the directory information recording area of the other optical disk medium 2, and the other head is read out. The (first) head 13 accesses the data file recording area of one optical disk medium 1 according to the directory information read by the second head 14, and reproduces the data file in step S-13. Thereafter, the second head 14 is driven again to read the next directory information from the directory information recording area of the other optical disk medium 2, and the first head 13 is driven in accordance with the read directory information to file the data file. Repeat the action of playing.

In this case, since the directory information recording area generally falls within a narrow area, the search seek time takes almost no more than the rotational waiting time. Therefore, compared to the case where the head alternately moves back and forth between the directory information recording area and the data file recording area, the search seek time can be significantly reduced, thereby increasing the data transfer speed.

In the above embodiment, the directory information was recorded only on the optical disk medium other than the optical disk medium on which the data file was recorded, but as shown in FIG. Directory information of all data files recorded on the two optical disc media can also be recorded on both optical disc media. In this way, when one directory information is destroyed, it can be backed up by the other directory information, and the reliability of the system can be improved. The operation of the optical disc drive in this case is shown in FIG. As is clear from this figure, in this example, the directory information of the data files recorded on one optical disk medium 1 and the other optical disk medium 2 is transferred to the first head 13 and the other optical disk medium 2 in step S-4'. Both optical disk media 1 are controlled by the second head 14.
, 2.

Furthermore, in the above embodiment, when reproducing information, one head was fixed to the directory information recording area and the other head was used to reproduce the data file, but both heads were fixed to the directory information recording area and the data file, respectively. It is also possible to reproduce data files from the two optical disc media 1 and 2 at the same time by reciprocating to and from the file recording area. FIG. 8 shows the operation of the optical disc drive in this case. In FIG. 8, a case is displayed in which directory information of all data files is recorded on both of two optical disk media, and step S
-11', the first and second heads 13 are read according to the directory information.
, 14 to simultaneously read desired data files from each optical disk medium 1, 2. In this way, data files that are related to each other can be read simultaneously, such as video information from one optical disk medium and matching music information from the other optical disk medium, and a single-head optical disk system The data transfer speed can be approximately doubled compared to .

[0028]

As explained above, when an optical disk system including an optical disk and an optical disk drive device of the present invention is used, one of the first and second heads can be connected to one of the optical disks that the head faces. While accessing the directory information recording area of the medium and reading the directory information of the data file recorded on the other optical disk medium, the other head is accessed to the data file recording area of the other optical disk medium that the other head faces, and the above-described operations are performed. Since the data file corresponding to the directory information read by one of the heads can be read, the time required for searching and seeking the directory information can be shortened, thereby increasing the data transfer speed.

[Brief explanation of the drawing]

FIG. 1 is a developed view of an optical disc according to the present invention.

FIG. 2 is an explanatory diagram showing an example arrangement of data files and directory information.

FIG. 3 is a block diagram of an optical disc drive device according to the present invention.

FIG. 4 is an explanatory diagram of the operation of the optical disc drive during recording.

FIG. 5 is an explanatory diagram of the operation of the optical disc drive during reproduction.

FIG. 6 is an explanatory diagram showing another arrangement example of data files and directory information.

FIG. 7 is another explanatory diagram of the operation of the optical disc drive device during recording.

FIG. 8 is another explanatory diagram of the operation of the optical disc drive device during recording.

[Explanation of symbols]

1 One optical disk medium 2 Other optical disk medium 3, 3a Recording area 4, 4a Directory information recording area 5, 5a Data file recording area 10 Optical disk 13 First head 14 Second head 20 Optical disk drive device

Claims (5)

[Claims] Claim 1: Two optical disc media on which preformat patterns are formed so that the information recording directions are opposite to each other are assembled concentrically, and a head is accessed individually for each optical disc medium, thereby producing both optical discs. In a double-sided access type optical disc that allows information to be recorded/reproduced simultaneously on the medium, directory information of a data file recorded on one of the two optical disc media is recorded on the other optical disc medium. An optical disc characterized by: 2. The optical disc according to claim 1, wherein the optical disc medium on which the data file is recorded also includes directory information regarding the data file. 3. A spindle motor for rotationally driving a double-sided access type optical disk detachably mounted thereon, and a first and second spindle motor disposed on both sides of the double-sided access type optical disk mounted on the spindle motor. In an optical disk drive device that includes a head and a controller that controls the first and second heads, when recording information, one of the first and second heads is driven to record the first and second heads. The directory information of the data file recorded on one of the optical disk media constituting the double-sided access type optical disk is recorded on the other optical disk medium by driving the other head, and when the information is reproduced, the first and the first drive one of the two heads to drive the other head based on directory information read from one of the optical disc media constituting the double-sided access type optical disc; A recording/reproducing type optical disk drive device, wherein the controller is configured to read a data file corresponding to the directory information from the directory information. 4. The controller according to claim 3, wherein, when recording information, the controller is configured to also record directory information of the data file on either one of the optical disk media on which the data file is recorded. A recording/reproducing type optical disk drive device characterized by: 5. A spindle motor for rotationally driving a double-sided access type optical disk removably attached thereto, and a first and second spindle motor disposed on both sides of the double-sided access type optical disk mounted on the spindle motor. In an optical disk drive device that includes a head and a controller that controls the first and second heads, when reproducing information, one of the first and second heads is driven to control the first and second heads. The controller drives the other head based on directory information read from one of the optical disk media constituting the double-sided access type optical disk, and reads a data file corresponding to the directory information from the other optical disk medium. What is claimed is: 1. A read-only optical disc drive device comprising: