The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1995
Filed:
Nov. 04, 1992
Michael Black, Foster City, CA (US);
Vladimir Kupershmidt, Pleasanton, CA (US);
Reliant Laser Corporation, Foster City, CA (US);
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.