G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/0045 (2006.01) G11B 5/09 (2006.01) G11B 7/0037 (2006.01)
Patent
CA 2467888
A multi pulse section 30 is generated in the mark forming portion corresponding to a mark 21 having a length nTw (n ~ 2), where Tw represents a reference clock cycle. The multi pulse section 30 consists of pulses of the number (n-1) each having the power level a, and pulses of the number (n-2) each having the power level b (b<a), each of which is formed between the adjoining pulses having the power level a. Further, a heat blocking pulse 35 having the power level c (c<a) is generated immediately after the multi pulse section 30. A bias section 36 having the power level d (c<d<a) is generated between the heat blocking pulse 35 and a succeeding multi pulse section 30. The bias setion 36 corresponds to a space 22. The time length tc of the heat blocking pulse 35 is: tc ~ Tw. With this arrangement, information can be precisely recorded in and reproduced from a WORM type information recording medium.
Akiyama Tetsuya
Miyagawa Naoyasu
Matsushita Electric Industrial Co. Ltd.
Panasonic Corporation
Riches Mckenzie & Herbert Llp
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