Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-01-05
1992-12-15
Howell, Janice A.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 83, 359 85, 359 90, 359 98, 359106, G02F 11337, G02F 11333, G02F 1137, G02F 113
Patent
active
051722569
ABSTRACT:
The present invention is a novel and improved variable color/variable density optical system (10) adapted for use in a variety of lens and window applications. The preferred device embodying the invention is a novel optical sunlight protective device (12) incorporating a liquid crystal color lens, a photodetecting sensor component and circuit (18) and oscillating/driving electronic circuit (70), all of the present invention and incorporated in an appropriate frame (24). The lens element (b 14) includes plastic housing (40,42) of a curved shape complementary to any desired fashion design and, a liquid crystalline medium (58) of the novel phase change guest-host type. Combination of the lens construction, homeotropic surface alignment (48, 50) and aforementioned liquid crystal/dye complex brings about the clear, optical distortion-free variable color transmission with broad ranges of color density with incorporated protection against ultraviolet radiation. Two conductive layers of lens elements (44, 46) are connected to the driving electronics (70) of the present invention such that variations in light intensity on the photo-detecting sensor component and circuit (18) result in final corresponding variations in the alignment of liquid crystalline complex (58), thus altering the light transmissivity of the lens element (14). Eyewear products incorporating the optical device (10) function effectively under both bright sunshine and overcast or foggy conditions, including all intermediate and changing light conditions, thus making them useful over a wide range of applications.
REFERENCES:
patent: 4323473 (1982-04-01), Sethofer
patent: 4323504 (1982-04-01), Sethofer
patent: 4495083 (1985-01-01), Imazeki et al.
patent: 4550980 (1985-11-01), Shingu
patent: 5026505 (1991-06-01), Kaneko et al.
Kawarada et al., "An Improved Positive Contrast Guest-Host Type Display Using Nematic-Cholesteric Phase Change", Conference: International Electron Devices Meeting, Dec. 1981, pp. 301-304.
Saunders, "New Photostable Anthraquinone Dyes with High Order Parameters", Proceedings of the SID, vol. 24/2, 1983, pp. 159-162.
Henderson, deceased Eric R.
Sethofer Nicholas L.
Gross Anita Pellman
Howell Janice A.
Hughes Michael J.
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