Large-field holographic binocular helmet visor

Optical: systems and elements – Holographic system or element – Head up display

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359 19, 359630, 340705, G02B 2710, G02B 2310, G02B 532

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active

051248212

ABSTRACT:
The visor makes it possible to obtain in binocular vision a large field of 60.degree. in the vertical plane and 120.degree. in the horizontal plane. In the case of each monocular vision channel, the visor is constituted by: an image generator such as a miniature cathode-ray tube, for example; an optical relay device; a collimation and combination optical system in which are grouped together a holographic mixing plate for transmitting the landscape channel and reflecting the image channel and a biconvex combining device formed by two holographic spherical optical elements employed on the axis for transmitting the two channels with collimation by diffraction of the image channel. A circular axial zone of zero photometric efficiency is produced in the case of each monocular vision channel and compensated by overlapping of the fields in binocular vision and, in a complementary manner, by the construction of mirror holograms providing variable index modulation.

REFERENCES:
patent: 3923370 (1975-12-01), Mostrom
patent: 3940204 (1976-02-01), Withrington
patent: 4261647 (1981-04-01), Ellis
Proceedings of the IEEE 1981 National Aerospace and Electronics Conference NAECON 1981, Dayton Convention Center, 19-21 May 1981, vol. 3, pp. 1261-1268, IEEE, Dayton Section Aerospace and Electronic Systems Society, New York, US; R. L. Berry et al.: "The Latirn wide field-of-view raster head.varies.up display".
Optical Engineering, vol. 24, No. 5, Sep./Oct. 1985, pp. 769-780, Society of Photo-Optical Instrumentation Engineers, Bellingham, US; J. R. Magarinos et al.: "Holographic mirrors".
Kogelnick, "Coupled Wave Theory for Thick Hologram Gratings", pp. 2909-2946, The Bell System Technical Journal, vol. 18, Nov. 1969, No. 9.
B. J. Chang, "Dichromated Gelatin Holograms and Their Applications", pp. 642-648 Optical Engineering 19(5), Sep./Oct. 1980.
B. J. Chang "Dichromated Gelatin for the Fabrication of Holographic Optical Elements", pp. 2407-2417, Applied Optics, vol. 18, No. 14, Jul. 15, 1979.

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