Invention Grant
- Patent Title: Optical information apparatus and method of recording and erasing information
- Patent Title (中): 记录和擦除信息的光信息设备和方法
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Application No.: US795313Application Date: 1985-11-06
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Publication No.: US4718053APublication Date: 1988-01-05
- Inventor: Yoshio Sato , Satoshai Shimada , Hiroshi Sasaki , Norifumi Miyamoto , Nobuyoshi Tsuboi , Hideki Nihei , Ryuji Watanabe , Atsumi Watanabe , Tetsuo Ito , Hiroaki Koyanagi
- Applicant: Yoshio Sato , Satoshai Shimada , Hiroshi Sasaki , Norifumi Miyamoto , Nobuyoshi Tsuboi , Hideki Nihei , Ryuji Watanabe , Atsumi Watanabe , Tetsuo Ito , Hiroaki Koyanagi
- Applicant Address: JPX Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JPX Tokyo
- Priority: JPX59-234988 19841109; JPX59-255315 19841203; JPX59-255320 19841203; JPX59-255319 19841203
- Main IPC: G11B7/0055
- IPC: G11B7/0055 ; G11B7/013 ; G11B7/09 ; G11B7/135 ; G11B7/24085 ; G11B7/243 ; G11B7/257 ; G11B7/095 ; G11B7/24
Abstract:
The present invention employs as a recording medium a metal or alloy which exhibits an intercrystalline transition before and after writing. In the present invention, two light beams of unequal wavelengths are used so as to write information with the light beam of the longer wavelength and to erase information with the light beam of the shorter wavelength. In changing a written content, a wavelength with which the reflection rate of the recording medium increases is used.
Information query
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