Fresnel lens, and a method and mold for manufacturing it

Details Fresnel lens, and a method and mold for manufacturing it Fresnel lens, and a method and mold for manufacturing it

1981-09-29

1984-06-26

Corbin, John K.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

264 11, G02B 308

Patent

active

044563442

ABSTRACT:
The Fresnel lens is provided, as viewed in cross-section, with a face formed with a plurality of spirally arranged teeth, each whereof includes a light ray refracting portion and a connection flank to the next adjacent refractive portion, in each tooth the angle included between any such refractive portions and the adjoining connection flank being less than 90.degree..

REFERENCES:
patent: 2510344 (1950-06-01), Law
Miller et al., "Thin Sheet Plastic Fresnel Lenses of High Aperture," Journal of the Optical Society of America, vol. 41, No. 11, 11/1951, pp. 807-814.

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