Indent duplicating process

Details Indent duplicating process Indent duplicating process

1975-07-03

1977-08-09

Kimlin, Edward C.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264219, 264220, 96 81, 353120, 354115, 355 54, B29D 1100

Patent

active

040411141

ABSTRACT:
A method of making copies of information sets of the type carried by microfiche elements having integral lenses on one surface thereof. The microfiche copy is made by embossing the top surface of a plastic, planar blank to form the integral lenses. The bottom surface of the blank is selectively dimpled by a stamping block, the dimples having the shape of generally hemi-spherical cavities. The dimples function in a manner analogous to developed images in a photographic emulsion. The dimples scatter light normally incident upon the bottom surface of the microfiche and thus function as light absorbers vis a vis an image viewed on a projection screen. Thus, microfiche copies may be made without the use of silver bromide. The selective rupture process may also be employed in the duplication of motion picture film.

REFERENCES:
patent: 3758649 (1973-09-01), Frattarola
patent: 3840417 (1974-10-01), Yager
patent: 3853395 (1974-12-01), Yevick
patent: 3864034 (1975-02-01), Yevick
patent: 3882207 (1975-05-01), Hannan et al.
Bartolini et al., "Replication of Relief-Phase Holograms for Prerecorded Video", J. of Electrochem. Soc., Oct. 1973, pp. 1408-1413.

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