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:
Jul. 08, 1997
Filed:
Jun. 02, 1994
Osamu Nonoyama, Yokohama, JP;
Yukio Ide, Mishima, JP;
Makoto Harigaya, Hiratsuka, JP;
Yoshiyuki Kageyama, Yokohama, JP;
Hiroshi Deguchi, Yokohama, JP;
Katsuyuki Yamada, Mishima, JP;
Masaetsu Takahashi, Yokohama, JP;
Hiroko Iwasaki, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An intensity of light reflected on a phase-changing type of information recording medium is changed since unrecorded and recorded portions of the recording medium have different phase states so that reflectivities of the unrecorded and recorded portions are different from each other. Such an intensity change takes place in a very short time immediately after a recording pulse is irradiated onto the phase-changing type of information recording medium. In a recording and simultaneous verifying method of the phase-changing type of information recording medium, the change in intensity of light reflected on the phase-changing type of information recording medium is detected by using this light reflected simultaneously with a recording pulse irradiated onto the phase-changing type of information recording medium. It is confirmed if the information is correctly recorded by detecting the reflected light. Thus, this information can be recorded to the information recording medium and can be simultaneously verified.