Multi-value information recorder, method, medium and information recording-reproducing device

A technology for information recording and recording marks, applied in optical recording/reproduction/erasing methods, optical recording/reproduction, information storage, etc., can solve the problem that laser energy cannot be corrected, and it is impossible to obtain recorded multi-valued data. Problems such as the certainty of regeneration can be achieved to reduce the determination error and optimize the emission energy

CN1447314AInactive Publication Date: 2003-10-08RICOH KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2003-10-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

A multi-level information recording-reproducing apparatus can accurately determine multi-level information even if recording density is increased. A multi-level information recording-reproducing apparatus radiates a laser beam to an information recording medium by switching a radiation energy level of the laser beam in a multi-level fashion and records a recorded mark in the information recording medium. The multi-level information recording-reproducing apparatus reproduces a multi-level data sequence recorded as a test pattern in the information recording medium, sets a reproduction signal level of a recorded mark based on an immediately-before cell located immediately before a cell to be reproduced, and corrects the radiation energy level of the laser beam so that the reproduction signal level can have a separate distribution from a distribution of another reproduction signal level.
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Description

technical field

[0001] The present invention generally relates to a multi-valued information recording device, a multi-valued information recording method, a multi-valued information recording medium for recording information on an information recording medium such as an optical disc using a multi-valued recording technique, and a A multi-valued information recording-reproducing apparatus that records and reproduces information on an information recording medium such as an optical disc by using a multi-valued recording technique, and more specifically relates to an accurate A multi-valued recording apparatus, a multi-valued information recording method, a multi-valued recording medium, and a multi-valued recording-reproducing apparatus that determine multi-valued information. Background technique

[0002] The development of computer-related technology and information technology in recent years has accelerated the process of digitizing various types of information such as ima...

Examples

Embodiment Construction

[0133] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0134] Figure 8 A block diagram of the structure of the optical disc recording-reproducing apparatus according to the first embodiment of the present invention is given.

[0135] The optical disc recording-reproducing apparatus 100 comprises a motor 1, a reproduction signal amplifier 2, a recording-reproduction signal comparator 3, a decision unit 4, a recording state table storage section 5, a modulation signal generator 6, a recording waveform generator circuit 7, a laser drive circuit 8, and photometric head 9.

[0136] When recording multi-valued data, that is, when recording marks are formed, the motor 1 rotates the optical disc 10 at a predetermined rotational speed. The modulation signal generator 6 supplies all the combinations, that is, all the multivalued data sequences as a plurality of multivalued data of the test pattern, to the recording...