Method for the manufacture of fresnel lenses using light-sensiti

Details Method for the manufacture of fresnel lenses using light-sensiti Method for the manufacture of fresnel lenses using light-sensiti

1973-08-02

1976-04-06

Kimlin, Edward C.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 27R, 96 27E, 350178, 350211, G03C 500, G03C 1100, G03C 504

Patent

active

039486605

ABSTRACT:
In a method of forming a Fresnel lens from a body of light-sensitive material of the type which undergoes changes in its optical path-length when exposed to light, the step of exposing each portion of such body of light-sensitive material to light to the extent necessary to impart to the respective portion the optical path-length requisite for the corresponding portion of the Fresnel lens to be formed.

REFERENCES:
patent: 3072742 (1963-01-01), Block
patent: 3725106 (1973-04-01), Hosokosni
patent: 3728118 (1973-04-01), Fillmore et al.
patent: 3743507 (1973-07-01), Ih et al.
patent: 3764366 (1973-10-01), Ninagawa et al.
patent: 3775110 (1973-11-01), Bestenreiner et al.

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