WRITING BINARY INFORMATION INTO OPTICAL STORAGES IN INFORMATION SYSTEMS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
A survey of large-capacity optic memory systems is presented. These systems for storing binary information use the following data carriers silver halide, Kalvar a polyethylene teraphthalate layer 75 mu m thick, and thermoplastic and photochromic layers. Maximum resolution for these materials is 1000-2000 linesmm, and storage duration is for years. Holographic laser systems are also cited. These use either of the above carriers, with writing speeds reaching 100,000 bitssec., or 3-dimensional data carriers which are being closely studied by researchers, although it is not known whether data may be modified in this type of carrier. A Soviet contribution to the art of storing a large amount of data by optic mean, is the so-called raster photoscopic store, for which two patents were issued in 1961. The system uses a photographic plate and a lens raster to record an image e.g., a punched card on a section of film directly behind each lens of the lens raster.
- Computer Hardware