Multi-focus system for a low light level vision apparatus

Details Multi-focus system for a low light level vision apparatus Multi-focus system for a low light level vision apparatus

1991-03-01

1992-12-29

Sugarman, Scott J.

Optical: systems and elements

Lens

Plural focal length

250214VT, 359494, 359498, 359566, 359570, G02B 310, G02B 2728, G02B 2744, H01J 3150

Patent

active

051756510

ABSTRACT:
A night vision apparatus 10 includes a first focusing refracting lens 28 which focuses light rays 29 from distant scene 14 onto a light intensifier 30. The kinoform 40 or bifringent lens 78 are disposed in the light path to allow light rays 35 from near scene 18, 20, 22 and 24 to be focused onto light intensifier 30 to form a multi-focus night vision apparatus with increased depth of focus.

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patent: 4783152 (1988-11-01), Nishimoto
"Diffractive Bifocal Contact Lenses", W. N. Charman, BSC, PHd Contax May 1986.
"The Holographic Bifocal Contact Lens", Suzanne St. Cyr, Holosphere, vol. 15, No. 5, Fall, 1988.

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