Variable density light transmitting device

Details Variable density light transmitting device Variable density light transmitting device

1986-04-17

1990-02-20

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350407, 351 49, G02B 530

Patent

active

049021125

ABSTRACT:
A variable density light transmitting device comprising a first light transmitting layer having a plurality of light polarizing areas with differently oriented transmission axes; a second light transmitting layer overlying said first light transmitting layer and movable relative said first layer while remaining generally parallel to said first layer, said second light transmitting layer having a plurality of light polarizing areas of differently oriented transmission axes of corresponding size and arrangement to said light polarizing areas on said first light transmitting layer; said light polarizing areas on said first layer being selectively positionable opposite different ones of said light polarizing areas of said second layer by relative movement of said first layer with respect to said second layer; whereby variable density light transmission is provided through said first and second layers by said relative movement. In one embodiment the relative movement is linear, and in another embodiment the relative movement is rotational.

REFERENCES:
patent: 2617329 (1952-11-01), Dreyer
patent: 2720553 (1955-10-01), Toulon
patent: 3054204 (1962-09-01), Yates
patent: 3437401 (1969-04-01), Siksai
patent: 3944346 (1976-03-01), Shindler
patent: 4286843 (1981-09-01), Reyblatt

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