Holographic rear window stoplight

Details Holographic rear window stoplight Holographic rear window stoplight

1987-01-06

1990-01-09

Arnold, Bruce Y.

Signals and indicators

Navigation devices

116202, 340468, 340479, 350 375, 350174, G02B 532, G03H 128, F21Q 100, B60Q 144

Patent

active

048923699

ABSTRACT:
An improved holographic rear window stoplight is provided and includes a hologram member laminated to the rear window surface. Single or multiple hologram layers may be provided. The hologram layers can have a diffraction grating developed in a position relative to the other diffraction grating to provide a folded reflection of light from a source of light of an appropriate wavelength band to indicate a stoplight from a predetermined angle. Alternatively predetermined indicia can be selectively displayed in either a single or multiple layer configuration. The reflection hologram member is transparent when not in use to all observers and remains transparent to the driver even when in use, and thereby prevents any blocking of his field of view.

REFERENCES:
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Patent Abstracts of Japan, vol. 10, No. 51, (M-457), (2108), Feb. 28, 1986, and Japanese Patent No. 60199746, (Nissan Jisosha K.K.), Oct. 9, 1985.
Patent Abstracts of Japan, vol. 10, No. 88, (M-467), (2145), Apr. 5, 1986, and Japanese Patent No. 60226336, (Nissan Jisosha K.K.), Nov. 11, 1985.
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Wuthrich, A. et al., "Holography with Guided Optical Waves," Appl. Phys., 21, 55-64, (1980).
Collier, R. et al., Optical Holography, New York: Academic Press, 1971, (QC449.C6), Sec. 17.6, "Multicolor Images from Volume Holograms," pp. 514-522.
Sincerbox, G., "Formation of Optical Elements by Holography," IBM Tech. Disc. Bull., vol. 10, No. 3, Aug., 1967, pp. 267-268.

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