Variable focus adapter

Details Variable focus adapter Variable focus adapter

1995-07-11

1997-04-01

Ben, Loha

Optical: systems and elements

Lens

With support

359823, 359827, 359894, 359418, 359403, 359425, 359428, G02B 702

Patent

active

056172575

ABSTRACT:
A variable focus adapter is disclosed that comprises the combination of a ns and an aperture provided by a plate all lodged in a housing that is placed so that the lens is in proximity with each objective lens of a binocular arrangement to change the focal range from greater than 20 ft. to seven (7) ft. with a depth of field spanning from 5 to 15 ft.

REFERENCES:
patent: 3782822 (1974-01-01), Spence
patent: 4116529 (1978-09-01), Yamaguchi
patent: 4249799 (1981-02-01), Iglesias
patent: 4251127 (1981-02-01), Yamaguchi
patent: 5221992 (1993-06-01), Park
patent: 5289320 (1994-02-01), Kobayashi
patent: 5361162 (1994-11-01), Goebel

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