Telegraphy – Systems – Printing
Patent
1975-09-30
1976-12-14
Stern, Ronald J.
Telegraphy
Systems
Printing
96 11, 178 66TP, 340173TP, 346 77E, G03H 118, G03G 1600
Patent
active
039972380
ABSTRACT:
A holographic recording process uses a thermoplastic photosensitive member in which charging on the member and exposing the same to light having holographic information are carried out simultaneously, and an unevenness image corresponding to the information is ultimately formed on the member through a heating and a cooling step. The charging rate, charging-exposing time interval, light intensity and other factors are chosen to assure a high quality recording and hence a favorable image reproduction. In particular, the charging rate is chosen from those which lie in a region of characteristic curves above the line corresponding to 7 dB S/N ratio, the characteristic curves representing the relationship between the S/N ratio of the reproduced holographic image and the charging rate with parameters of the light intensity and the charging-exposing time interval. Further, if 15 dB S/N ratio is used as the limiting line, more than 30 times repeated use of the thermoplastic member is possible.
REFERENCES:
patent: 3413146 (1968-11-01), Anderson et al.
patent: 3821722 (1974-06-01), Ost
patent: 3851948 (1974-12-01), Gange et al.
Lee, Applied Optics, vol. 13, No. 4, April 1974, pp. 888-895.
Abe Michiharu
Oride Akiyoshi
Ricoh Co. Ltd.
Stern Ronald J.
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