JPH0384736A - Optical disk cleaning alarm 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 is for detecting deterioration of a reproduced signal due to deposits during access in a magneto-optical disk device or other optical disk device to issue an alert for cleaning the optical disk or device. Regarding the device.

Conventional technology Conventionally, optical disk devices reproduce signals using a light spot narrowed to 1 μm or less.
There were few problems such as access errors and signal level drops due to small deposits such as dust and dirt. For this reason, no special measures have been taken to prevent deterioration of the reproduced signal due to deposits, and if an access error occurs due to deposits, the user must clean the entire surface of the optical disc, objective lens, etc., regardless of the location of the deposits. was.

Problems to be Solved by the Invention However, the environments in which optical disks and optical disk devices are used are diversifying from user to user, and the number of environments in which deposits are likely to adhere is increasing. Therefore, cleaning the optical disk or objective lens without knowing the location of the deposit when an access error occurs not only reduces work efficiency but also reduces the reliability of the optical disk or device by cleaning more than necessary. There is a risk that it may cause

The present invention solves these conventional problems, and provides an optical disc cleaning alarm device that can issue a warning for effective removal of deposits by specifying the location where the deposits are present. The purpose is to

Means for Solving the Problems In order to achieve the second object, the present invention detects the deterioration of the reproduced signal caused by deposits when accessing an optical disk, and determines whether this is a regular occurrence or not at a specific access position. It is designed to determine whether or not it occurs.

Effect E. Therefore, according to the present invention, the detected reproduced signal 2) If the deterioration is steady, it is determined that the part of the deposit is on the optical system of the access part of the objective 1, lens, etc. Since it is possible to clean only that part, it becomes necessary to clean only that part. Furthermore, if the detected deterioration of the reproduced signal occurs at a specific access position, only that part of the optical disc is cleaned. In this way, in step 12, the area where deposits are present is cleaned, so that work efficiency can be improved and reliability can be prevented from deteriorating.

Embodiment FIG. 11 shows the configuration of a positional embodiment of the present invention. In this embodiment, when an error occurs, the same truck is operated continuously during a stall operation such as retry or standby, and 4. We will explain the case where the file is accessed multiple times. In FIG. 1, reference numeral 9.1 is an access error detection section that detects access errors, and serves as a reproduced signal deterioration detection section. This is the playback signal 1 that detects the drop in the playback signal level.
It may be a novelty reduction detection section. a is an error signal, which is output from the access error detection section 1. Reference numeral 2 denotes a one-rotation waiting section for the optical disk, and 3 denotes a fall detection section for detecting the fall of the error signal a, and these constitute a first determination section. b is a reset signal for the optical disc 1 rotation wait section 2, C is the optical disc 1
4 is a constant error signal when the error 4g Q a continues over rotation, and 4 is an alarm display section. Reference numeral 5 denotes an access position detection unit for detecting an access position (sector; the same applies hereinafter) on the optical disk, and d is a signal indicating the access position.

6 is an error sector flag table unit that indicates the presence or absence of a sector error for each access position; C is a sector error signal serving as a flag; 7 is a flag processing circuit unit that performs processing according to the operation table shown in FIG. 3; Outputs f1 reset signal g and specific sector error signal. This error sector flag table section 6 and flag processing circuit section 7
A second determination section is configured.

Next, the operation of the above embodiment will be explained with reference to the flow shown in FIG. First, when an access error is detected in the access 'J'-error detection section 1 from the state of "no access error" (step 11), the one-rotation waiting section 2 of the optical disk waits for one rotation based on the signal a. When the fall detection section 3 detects a fall of the error signal a, the fall detection section 3 outputs a reset signal 71- to apply a reset 71- to the one-rotation wait section 2, and the one-rotation wait starts again. If the error signal a is continuously detected during one revolution of the optical disc, a steady error state occurs (step 12), and the signal C causes the alarm display unit 4 to issue an alarm with sound, light, text, etc. When this display is displayed, it is determined that there is dust etc. on the optical system, so the operator cleans the lens of the optical system and recovers from the error (step 13). If the error still does not recover, it is determined that the optical characteristics within the drive are insufficiently deteriorated, and parts, etc. are replaced (step 14).

On the other hand, the access position detection unit 5 detects the optical disk L
The access position is constantly detected, the set signal f is first output based on the signal d and the access error signal aε, and when the error signal a is output again in the same sector, the specific sector error signal 11 is displayed on the alarm display section 4. Output is exhausted and a specific sector error alarm is issued (Steps 1 and 5)
. If the same error does not occur twice in the same sector, a reset signal g is output. When a specific sector error alarm is displayed ε, it is determined that dust or the like has adhered to the optical disc, so the user cleans the corresponding track portion of the optical disc to recover from the error (step 16). If the error still cannot be recovered, it is determined that the optical characteristics of the optical disc have deteriorated, and the optical disc is rewritten or replaced (step 17).

Effects of the Invention As is clear from the above-mentioned embodiments, the present invention detects the deterioration of the vital signal caused by the deposits when accessing the yellow disk, and identifies the part where the deposits are present. This has the effect that it is possible to perform the necessary minimum amount of cleaning quickly and with good work efficiency, and that it is possible to prevent low reliability.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram of an optical disk cleaning alarm device according to an embodiment of the present invention, Section 2 is a schematic flowchart showing the operation in Embodiment 1, and Fig. 3 is a diagram showing the judgment operation criteria in the same embodiment. It is a diagram. 1... Access error detection section, 2... Optical disk C
1 rotation waiting section, 3... falling detection section, 4... alarm display section, access position detection section on the optical disk, 6...
Error sector flag table section, 7... Flag processing circuit section, a... Access error signal, b... Reset signal, C... Steady error signal, d... Access position signal, e... - Sector error signal, f...set signal, g...reset signal, h...specific sector error signal.

Claims (1)

[Claims] A reproduction signal deterioration detection section detects deterioration of the reproduction signal caused by deposits when accessing the optical disk, an access position detection section detects the access position at the time of access, and a signal from the reproduction signal deterioration detection section enables steady reproduction. a first determination section that determines whether or not there is signal deterioration; and a second determination section that determines whether or not there is reproduction signal deterioration at a specific access position based on a signal from the reproduction signal deterioration detection section and a signal from the access position detection section. 1. An optical disk cleaning alarm device comprising: a determination section; and an alarm display section that displays an alarm based on a positive determination signal from each of the determination sections.