JPH01220148A - Optical disk medium - Google Patents

Abstract

PURPOSE:To discriminate the abnormality of a disk drive device before such abnormality arises by previously providing inspection information for the inspection of the operation of the drive device to a part of information tracks. CONSTITUTION:The inspection recording layer of a focus servo system, the inspection information of a tracking servo system or the inspection recording layer of a disk rotating system or the like is previously stored in the information tracks 2 of an optical disk medium 1. The part where the level of reflected light is lower than usual is provided as the inspection information of the focus servo system to the tracks 2. The part where the level of the reflected light rises to the value near the limit of the standard value of the focus control power of the drive device is provided as the inspection information of the tracking servo system. Further, the data deviating the bit rate down to the limit of the standard value is recorded as the inspection information of the disk system. The inspection routine is executed by the instruction of a host computer by using such medium 1. Whether the operation of the drive device is correct or incorrect is thereby checked beforehand.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc medium, and more particularly to an optical disc medium that allows abnormalities in an optical disc drive device to be determined before they occur.

[Conventional technology]

In recent years, with the remarkable development of light wave technology, IC technology, etc., information recording and reproduction using optical disk media and optical disk drive devices (hereinafter referred to as drive devices) has been actively performed. In this drive device, there is a tracking servo that detects whether the correct track is being traced and returns it to the original position if it shifts, a focus servo that focuses the optical spot for reading information, and a linear velocity or rotational speed of the optical disk medium. Various types of control such as disk rotation control that maintains a constant value are performed.

[Problem to be solved by the invention]

However, with conventional drive devices, it is not possible to know in advance if the drive device is malfunctioning or has malfunctioned. Therefore, if an optical disk medium is inserted into a drive device while it is malfunctioning or malfunctioning, it may not be possible to record data.
When a playback operation is performed, the information stored on the optical disk medium is destroyed, and when used in conjunction with other devices, the system may stop working.

The present invention has been made in order to solve the problems of the conventional technology, and it is possible to check in advance for malfunction or failure of the drive device, and to prevent the data recorded on the optical disk medium from being damaged. In addition to preventing system failures when used in conjunction with other devices, it is also possible to notify users of malfunctions or failures of the drive device in advance to avoid inconvenience to the users. The purpose is to provide optical disc media.

[Means to solve the problem]

In order to solve the above problems, the optical disc medium of the present invention has the following features:
Test information for testing the operation of the drive device is provided in advance on at least a portion of the information track.

The inspection information here refers to information that has the function of checking whether the operation of the drive device is normal or not, such as malfunction of the focus servo system, malfunction of the tracking servo system, malfunction of the disk rotation system ( rotation speed,
Information for inspecting linear velocity (linear velocity malfunction), etc.

Further, the inspection information may include, for example, reflected light level, bit rate, frequency, or guide groove defect length having values near the limits of standard values.

[For production]

If the optical disk medium of the present invention is installed in the drive device and the drive device is driven in test mode before operating the drive device, if the drive device malfunctions, the test information provided in advance on the optical disk medium will cause the drive device to For example, the user can check the normality of the operation of the drive device in advance by indicating a predetermined behavior such as the inability to track or the inability to reproduce data.
You will be able to accomplish the above tasks.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view schematically showing the optical disc medium 1 of this embodiment, and numeral 2 in the figure is an information track on which inspection information is recorded.

Failures in drive devices that occur particularly frequently and have serious effects are malfunctions in the focus servo system or tracking servo system, and malfunctions in the disk rotation system (rotational speed, linear velocity). When these defects occur, it becomes impossible to record or reproduce data, and especially during recording, previously recorded data may be destroyed, resulting in extremely serious consequences. Therefore, in the information track 2 of the optical disk medium 1 of this embodiment, inspection information for the focus servo system, inspection information for the tracking servo system, inspection information for the disk rotation system, etc. is recorded in advance. The information may be recorded on track 2, or any combination may be recorded on information track 2. In addition, the inspection information used in the present invention is limited to the inspection information exemplified here. Various types can be used.

Next, a specific example of the inspection information recorded on the information track 2 will be explained.

First, an example of inspection information for the focus servo system will be described. In this example, a portion where the level of reflected light is lower than normal is provided on the information track 2, and the level of reflected light in that portion is set to a value near the limit of the standard value of the focus servo control ability of the drive device. The reflected light level can be lowered, for example, by pre-recording a bit string with a large duty ratio on the information track 2. In this way, when the optical disk medium 1 is installed in a drive device and an inspection routine is executed, servo control becomes impossible if the focus servo system of the drive device is malfunctioning, so the information track 2 is inspected. The information can be used to check whether the focus servo system operates normally.

Next, an example of tracking servo system inspection information will be described. In this example, as in the case of the focus servo system inspection information, a portion where the reflected light level is near the limit of the standard value of the focus servo control ability of the drive device is provided in the information track 2. As a result, it is possible to check whether the tracking servo system operates normally in the same way as above. In addition, in the case of recording/reproduction using the guide groove method, it is necessary to intentionally form a defect in the guide groove of information track 2 so that tracking cannot be performed with an abnormal drive device, or to create a sector with a defect in the guide groove. is registered, and the defect itself is used as inspection information. Then, in the inspection routine, it is checked whether the tracking servo system is normal or not depending on whether tracking can be performed or not.

Next, an example of inspection information for the disk rotation system will be described.

In this example, the test information is data recorded with the bit rate shifted to the limit of the standard value. If this is done, a drive device in which an abnormality has occurred in the disk rotation system during the inspection routine will not be able to synchronize, and therefore will not be able to reproduce data.

- This makes it possible to check for malfunctions in the disk rotation system. Alternatively, a signal with a constant frequency may be used as the inspection information. In this case, by reproducing the test information using the drive device and checking whether the frequency is within a predetermined value, it is possible to determine whether there is an abnormality in the disk rotation system.

By using the optical disk medium 1 on which the above-mentioned inspection information is pre-recorded on the information track 2, the drive apparatus can be inspected by executing an inspection routine according to instructions from the host computer before actually operating the drive apparatus. You can check in advance whether the operation is normal or not. Therefore, the user can use the drive device with peace of mind.

In the above embodiment, the inspection information is provided on a part of the information track of a normal optical disk medium, but the optical disk medium may be a dedicated inspection disk having the above-mentioned inspection information.

〔Effect of the invention〕

As described in detail above, according to the present invention, since the inspection information for inspecting the operation of the drive device is provided in at least a part of the information track, it becomes possible to identify an abnormality in the drive device before it occurs. , the frequency of malfunctions occurring during use is reduced.

In addition, abnormalities can be detected before they develop into serious failures.
Destruction of recorded contents of an optical disk medium or irrecoverable failure will not occur.

[Brief explanation of the drawing]

The drawing is a plan view of an optical disc medium according to the present invention.

Claims (1)

[Claims] (1) An optical disc medium characterized in that test information for testing the operation of an optical disc drive device is provided on at least a portion of the information track.