Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1993-11-29
1996-06-11
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359630, 359631, G02B 2714
Patent
active
055261833
ABSTRACT:
An improved helmet visor display comprising three elements, including a tilted combiner, a refractive/diffractive relay module, and an image generator. The tilted combiner is a reflective-type combiner having either a spherical surface shape or a generalized aspheric surface shape. The relay module comprises a front-end collimating lens group, a pupil lens group in the middle, and a rear-end focusing lens group. The collimating lens group is comprised of one refractive doublet and one refractive-diffractive optical element. The combination of the refractive doublet and the refractive-diffractive optical element corrects for primary and secondary axial chromatic aberration, and significantly reduces higher order aberration as a result of power reduction in most lens elements. The pupil lens group comprises a conic or aspheric lens which reduces spherical aberration and enlarges the eye pupil. The focusing lens group comprises a refractive doublet and a wedge that relays the light emerging from the pupil lens group onto the image generator. A crown-flint refractive doublet in conjunction with a diffractive optical element may be employed in the focusing lens group to reduce primary and secondary lateral chromatic aberration and chromatic distortion. The wedge is used to reduce axial coma introduced by the tilted combiner.
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G. J. Swanson, Binary Optics Technology: Theory and Design of Multilevel Diffractive Optical Elements, 14 Aug. 1989, pp. 25-39.
Denson-Low Wanda K.
Epps Georgia Y.
Hughes Electronics
Mack Ricky
Sales Michael W.
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