The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2007
Filed:
May. 21, 2004
Tetsuya Akiyama, Hirakata, JP;
Naoyasu Miyagawa, Kawanishi, JP;
Tetsuya Akiyama, Hirakata, JP;
Naoyasu Miyagawa, Kawanishi, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A multi pulse sectionis generated in the mark forming portion corresponding to a markhaving a length nTw (n≧=2), where Tw represents a reference clock cycle. The multi pulse sectionconsists 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 pulsehaving the power level c (c<a) is generated immediately after the multi pulse section. A bias sectionhaving the power level d (c<d<a) is generated between the heat blocking pulseand a succeeding multi pulse section. The bias sectioncorresponds to a space. The time length tc of the heat blocking pulseis: tc≧Tw. With this arrangement, information can be precisely recorded in and reproduced from a WORM type information recording medium.