Method for generating pattern with pseudo-stain and optical test disk

Abstract

The present invention discloses a technique for generating a pseudo modification state pattern wherein a printing dot is reliably present in a BD spot with a stable total area ratio, and the transmissivity can be adjusted. A distribution pattern for printing is generated by processors (102a, 102b, 102c). The processor (102a) uses a computer (100) to draw a predetermined number of dot images in an area having a preset size assumed on a disk. The processor (102b) searches an area where no dot images are distributed. The processor (102c) adds and draws the dot images in the detected area where no dot images are distributed. This distribution pattern (200) is used for forming a printing master of a printing machine (140), and a pseudo fingerprint pattern (20a), which is a type of the pseudo modification state pattern, is printed on the surface area (11) of a disk (10), thereby forming the disk (10) for testing.

Description

technical field [0001] The present invention relates to a technique of generating a virtual changed state pattern for checking the reproduction performance of a reproduction device for changing the state of optical properties generated in a surface portion of an optical disc. Background technique [0002] An optical disc playback device irradiates a light beam to an optical disc, reads a signal of light reflected from the disc, and reproduces information. However, dirt such as fingerprints may adhere to the recording surface of the disc. Assuming such a case, it is necessary to investigate in advance where the optical disc playback device can read. Therefore, an optical disk reproducing apparatus uses an inspection disk on which a fingerprint or the like is reproduced, and performs an inspection of reproducibility based on a signal from the inspection disk. [0003] Patent Document 1 describes an inspection disc in which a grid-like dot pattern (with a dot diameter of 75 μ...

AI Technical Summary

Problems solved by technology

However, sometimes dirt such as fingerprints adhere to the recording surface of the disc.

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