JPH03256228A - optical disc device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device, and particularly to a method for managing management information on an optical disc.

[Conventional technology]

2. Description of the Related Art Conventional optical disc devices are known that divide an optical disc area into a plurality of areas and use a specific area of each divided area as a backup for bad sectors in each area. A technique related to this technique is described in, for example, Japanese Patent Laid-Open No. 195873/1983. Furthermore, an idea has been proposed in which the entire area of an optical disc is divided into a plurality of areas, and one area is used as a ROM and the other area is used as a recordable/reproducible area.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not particularly consider configuring the divided areas as independent files, and the range of the divided areas is not clear.

An object of the present invention is to divide the divided regions into two independent files.
.

The aim is to make information accessible at high speed by considering it as a file and effectively arranging its management information area.

[Means to solve the problem]

In order to achieve the above purpose, an optical disc is divided into multiple areas, a common area is provided between adjacent areas, and management information for the two adjacent areas is recorded in this common area. be. The management information includes, for example, volume labels, directories, and defect information for each area. By doing so, it is possible to speed up access to information in a target area compared to the case where management information for all areas is recorded in a specific area. In addition, in order to access the two areas at high speed, the size of the area is set within a range that allows the optical head to move toward the optical spoiler 1 at high speed using a fine actuator.

[Function] By arranging management information between adjacent areas, a large-capacity optical disc can be regarded as a composite capacity that is easy to manage. This improves the usability of optical discs in personal courses, while also allowing each of multiple discs to be regarded as independent. It becomes possible to access areas (files) at high speed. Furthermore, by setting the size of the area within a range in which the fine actuator of the optical head can move at high speed, access within the file can be made even faster.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In order to perform, for example, recording, reproduction, and erasing on a disk 2 rotated by a spindle motor 1, a light beam 4 emitted from a semiconductor laser 3 reaches a galvanometer mirror 7 through an optical system 5.6. The galvanometer mirror 7 has a function of slightly moving the light beam in the radial direction in order to position the light beam on a track on the disk 2. The light reflected by the galvanometer mirror 7 is focused by the objective lens 9 and reaches the recording film on the disk 2. The objective lens 9 is driven by an autofocus actuator 8 to focus on the disk 2 in response to the deflection of the disk 2 . The light reflected by the recording film of the disk 2 passes through the galvanometer mirror 7 and the optical system 6 and reaches the optical system 10. Optical system 10, light 2
One direction is further divided into two directions by an optical system 11, and each reaches a photodetector 12 and 13. On the other hand, the other side divided by the optical system 10 is also divided into two directions by the optical system 14, and each reaches an optical detector 15 and 16. From the outputs of the photodetectors 15 and 16, signals representing the deviation between the optical spoiler 1- and the track center and signals representing the defocus can be obtained, but the details are omitted as they are not directly related to the present invention. do.

The outputs of the photodetectors 12 and 13 are respectively converted into voltages by current-voltage conversion amplifiers 17 and 48, and are further converted into voltages by summing amplifiers 1.
9. The subtraction amplifier 20 separates the pre-pit signal 39 and the magneto-optical signal 40. The pre-pin 1 to signal 39 are treated as address signal -8, and the magneto-optical signal 40 is treated as a data signal.
It is reproduced by the reproduction circuit 21. In the reproduction circuit 21,
For example, it is composed of a differentiating circuit, a pulsing circuit, an FO circuit, a demodulating circuit, etc. The data reproduced by the reproduction circuit 21 is sent to the host 1-computer 23 via the control circuit 22. The control circuit 22 exchanges data and commands between the host computer and the optical disk device,
It also controls each part within the optical disc device.

In an optical disc device having such a configuration, the optical disc 2 is divided and used as shown in FIG. Let us assume that the regions divided in FIG. 2 are A, B.

Let C, D, . . . In order to use each area as an independent file, it is necessary to record management information such as the volume name and directory of each file. For example, if these pieces of management information are placed together on the innermost circumference, it is necessary to access the innermost circumference every time the file is updated, which increases the time it takes to write/reproduce the desired data. Therefore, in the present invention, two adjacent files can be accessed at high speed by recording the management information of each file in areas a and b between adjacent areas A and B or C and D. . For example, in FIG. 2, files A and B can be accessed at high speed by arranging the management information of two files, areas A and B, in area a between the areas A and B.

Furthermore, the range of access to each area for a and b can be set to a range in which the light spot can be moved by the carbano mirror 7 in FIG. 1, for example, so that high-speed seeking can be achieved.

Further, although it is assumed that each divided area is recorded in the same format, it is also possible to improve usability by recording in several different formats 1.

For example, in FIG. 2, areas A and B have a user high 1- number of 512 by 1- per sector, and C and D have 1024 bytes, so that on one disc,
It is possible to use two or more types.

〔Effect of the invention〕

According to the present invention, since a recording medium can be used as a plurality of independent files, the capacity of one file is relatively small and it is effective in meeting the demand for fine separation. Furthermore, by setting the area of each file as a range in which the optical head can move at high speed, and placing management information in the area between each of these divided files, it is possible to position the optical head on the target track at high speed. Become.

[Brief explanation of drawings]

FIG. 1 is a block diagram mainly showing a signal reproduction system of an optical disc device according to an embodiment of the invention, and FIG. 2 is a diagram showing an example of region division of an optical disc according to an embodiment of the invention. 2... Optical disk, 7... Galvano mirror 121.
... Reproduction circuit, 22 ... Control circuit, 30 ... User area after division, 31 ... Management information area.

Claims (1)

[Scope of Claims] 1. An optical disc device comprising an optically recordable and reproducible recording medium and an optical head for recording information on or reproducing information from the medium, wherein the medium is area), and a common area (second area) between the divided areas.
1. An optical disc device characterized in that an optical disc device is provided with an area (area), and management information of the first area is recorded in the second area. 2. In the optical disk device according to claim 1, the optical head has a fine actuator for moving the optical spot at high speed and a coarse actuator for moving the optical head largely, and the range of the first area is The optical disc device according to claim 1, wherein the optical disc device has a range that can be moved at high speed by an actuator.