Auto-focusing optical apparatus

Details Auto-focusing optical apparatus Auto-focusing optical apparatus

1992-12-24

1994-10-25

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 86, 351169, G02F 1137

Patent

active

053594444

ABSTRACT:
Eyeglasses including lenses that contain liquid crystal nematic materials with variable refractive indexes. A voltage is applied across the materials to change the refractive index in accordance with a measured distance so that the lenses are always automatically focused as the operator looks at objects different distances away. The distances are measured by an infrared ranging system included in the glasses, which system changes the voltage applied to the material in accordance with changes in distance.

REFERENCES:
patent: 4300818 (1981-11-01), Schachar
patent: 4601545 (1986-07-01), Kern
patent: 4756605 (1988-07-01), Okada et al.
patent: 5066301 (1991-11-01), Wiley
Kowel et al., "Focusing by electrical modulation of refraction in a liquid crystal cell", Applied Optics, vol. 23, No. 2, Jan. 15, 1984.

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