Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-09-16
1989-08-22
Richardson, Robert L.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369121, 369 58, 346 76L, G11B 700
Patent
active
048602760
ABSTRACT:
A micro optical head, for optically reading and/or writing digital data on a recording medium in which digital data 1 and 0, corresponding to a high reflection factor and a low reflection factor, is composed of a self-coupled semiconductor laser located close to the recording medium. A bias current of the laser is determined so that it is smaller than a first threshold current, in which the medium has a low reflection factor, and is higher than a second threshold current, in which the medium has a high reflection factor. Output light of the laser is either strong stimulated emission light, corresponding to the high reflection factor, or weak spontaneous emission light, corresponding to the low reflection factor. The present head is carried on a flying slider with a spacing length less than several .mu.m which provides a small beam spot of about 1 .mu.m, and has an excellent signal to noise ratio. A photodetector for sensing the output of the laser may be carried on the same semiconductor substrate as that of the laser.
REFERENCES:
patent: 4451915 (1984-05-01), La Budde et al.
patent: 4456914 (1984-06-01), Winslow
patent: 4538257 (1985-08-01), Klinger
Isomura Yoshihiro
Katagiri Yoshitada
Mise Keisuke
Sawada Renshi
Toshima Tomoyuki
Nippon Telegraph and Telephone Corporation
Richardson Robert L.
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