Liquid-crystal sunglasses indicating overexposure to UV-radiatio

Details Liquid-crystal sunglasses indicating overexposure to UV-radiatio Liquid-crystal sunglasses indicating overexposure to UV-radiatio

1992-11-04

1995-01-17

Shafer, Ricky D.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Combined

351 41, 351 44, 250372, G02C 710

Patent

active

053829867

ABSTRACT:
Liquid crystal sunglasses indicating overexposure to UV-radiation comprising a pair of liquid-crystal lenses (12 and 14) a rim (10), a bridge portion (14) which support the lenses, and a pair of temples (18 and 20) which supported by the rim. The rim (10) supports a pair of solar cells (28 and 30) and a dual-photodetector sensor (26) which can separately measure an incident UV-A radiation and a UV-B radiation and convert these radiations into electric signals. The sunglasses's rim also incorporates a microcontroller (36). The lenses have a laminated structure composed of a color mask (43), an input polarizing plate (44), a liquid crystal cell (50) sandwiched between a pair of voltage-controlled active matrices, and an output polarizing plate (46). Each active matrix consists of a plurality of sets of pixels which control the transmission of light through the respective color cells of a mosaic mask. The microcontroller also incorporates a frequency generator (104) and a memory unit. The memory stores an algorithm for calculating thresholds of UV radiation. When these thresholds are exceeded the lenses give to the wearer a warning signal either changing the color of the lenses or causing blinking.

REFERENCES:
patent: 4848890 (1989-07-01), Horn
patent: 4968127 (1990-11-01), Russell et al.
patent: 5015086 (1991-05-01), Okaue et al.
patent: 5114218 (1992-05-01), Black et al.
patent: 5151600 (1992-09-01), Black
patent: 5184156 (1993-02-01), Black et al.

Affiliated with

Also associated with

Rating

Liquid-crystal sunglasses indicating overexposure to UV-radiatio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Liquid-crystal sunglasses indicating overexposure to UV-radiatio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid-crystal sunglasses indicating overexposure to UV-radiatio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-750303