JPS6120239A - Disk-shaped optical recording medium - Google Patents

Abstract

PURPOSE:To adopt the format corresponding to information contents and to obtained fixed information having high reliability by forming a concentrical recording region and spiral recording region on the same plane of a medium and providing a fixed information region recorded preliminarily with the fixed information on the inside peripheral side. CONSTITUTION:The spiral recording region 3 consisting of spiral tracks 2 and the concentrical recording region 5 consisting of many pieces of concentrical tracks 4 are provided on one surface of the disk-shaped medium 1. The region 3 is positioned on the central side and the region 5 on the outside peripheral side. The reading and writing by a recording head are executed from the central side. The fixed information is preliminarily recorded in the innermost peripheral position of the region 3 and the fixed information region 6 is formed. The fixed information includes an initializing program, operating system program, generally invariable data and other information. Since the number of the times to be scanned by a laser beam is large, a protective film as a protecting means is formed in the region 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a disk-shaped optical recording medium on which optical information is recorded by an optical recording device.

Technical Background and Problems In general, this type of recording fiber is made of a disk made of glass or plastic coated with a metal film such as tellurium or bismuth that deforms into pits when irradiated with a laser beam. has been put into practical use. and,
The recorded information includes code information in addition to modulated PCM audio information and video information. There is a demand for a recording format suitable for each type of information for such a variety of information.

Furthermore, there is fixed information such as a system initialization program, and while such fixed information is irradiated with a laser beam many times, high reliability is required.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a disk-shaped optical recording medium that can adopt a format depending on the information content and can obtain highly reliable fixed information.

Summary of the Invention The present invention has two types of recording tracks: concentric tracks and spiral tracks, so either one can be selected depending on the information content. A fixed information area is provided in the machine, so that the fixed information can be read at the beginning of reading, and this fixed information area is protected from the laser beam by protection means, so that reliable fixed information can be obtained. It is configured so that it can be done.

Embodiment of the Invention First, a disk-shaped medium 1 is provided, and a spiral recording area 3 formed by a spiral track 2 and a concentric recording area 5 formed by a large number of concentric tracks 4 are provided on one surface of the medium 1. It is being The spiral recording area 3 is located on the center side, and the concentric recording area 5
is located on the outer periphery.

Although reading and writing by the recording head is performed from the center side, fixed information is recorded in advance at the innermost circumferential position of the spiral recording area 3 to form a fixed information area 6. This fixed information includes initialization programs, operating system programs, universally unchanging data, and other information.

Since such fixed information is always read out and is scanned many times with a laser beam, a protective film is formed in the fixed information area 6 as a protection means. In other words, if the medium 1 has a Pb-Te-8e thin film deposited on it, data can be recorded in the user recording area and the data in the fixed information area 6 will be destroyed at the same time. The data in the fixed information area 6 can be effectively protected by depositing a protective film made of an aluminum-based thin film on the wafer. In addition, instead of forming a protective film, for example, the material of the user recording area may be changed to Pb-Te-8.
The protective means may be formed by changing the material of the fixed information area 6 by using an aluminum type material and changing the material of the fixed information area 6. Furthermore, fixed recording area 6
The data in the fixed recording area 6 can also be protected by making the thickness of the recording film larger than the thickness of the user recording area.

In such a configuration, since the optical head for reading the medium 1 has its home position at the inner circumference of the medium 1, reading is performed from the inner circumference where the fixed information is recorded. In the case of long continuous information such as audio information or video information, pits are formed in the track 2 of the spiral recording area 3. This is advantageous because such information is continuously recorded on one track 2 without data breaks, so there is no need to move the optical head between tracks. Furthermore, in code information, unlike audio information or video information, there is a risk that a single bit misreading may result in completely different information, so it is necessary to further reduce the error rate. Under such conditions, it is often the case that the same track is read repeatedly, so recording is performed on track 4 of the concentric recording area 5, where the same track can be read again and again without moving the optical head between tracks. That is advantageous.

Therefore, a selection is made as to whether to record in the spiral recording area 3 or the concentric recording area 5 depending on the information content.

In particular, the fixed information area 6 in which fixed information is recorded is protected from being destroyed by a protective film or other protective means, so it cannot be destroyed by one overlapping laser beam reading scan or by a user's incorrect operation. Even when writing is performed in the fixed information area 6, information is not lost and highly reliable information can be obtained.

Effects of the Invention In the present invention, since the concentric recording area and the spiral recording area are formed on the same surface of the medium as described above, it is possible to select and use either area depending on the information content. In addition, since we have provided a fixed information area on the inner circumferential side in which fixed information is recorded in advance, fixed information can be read before operation starts.
In particular, since the fixed information area is protected by the protection means, highly reliable fixed information can be obtained.

[Brief explanation of the drawing]

The drawing is a plan view showing an embodiment of the present invention. 1... Medium, 2... Track, 3... Spiral recording area, 4... Track, 5... Concentric recording area, 6... Fixed information area

Claims (1)

[Claims] 1. A concentric recording area in which a large number of concentric tracks are formed and a spiral recording area in which a spiral track is formed are arranged on the same surface of a disk-shaped medium, and the medium 1. A disk-shaped optical recording medium, characterized in that a fixed information area in which fixed information is prerecorded is provided on the inner circumferential side of the medium. 2. A concentric recording area in which a large number of concentric tracks are formed and a spiral recording area in which a spiral track is formed are arranged on the same surface of a disk-shaped medium, and fixed to the inner circumferential side of the medium. A disk-shaped optical type characterized by having a fixed information area in which information is recorded in advance, and having a protective means to protect the recorded contents from being destroyed even if the fixed information area is irradiated with a laser beam. recoding media.