Afocal zooming optical system

Details Afocal zooming optical system Afocal zooming optical system

1991-11-29

1994-05-10

Henry, Jon W.

Optical: systems and elements

Compound lens system

Variable magnification

359422, 359691, 359646, G03B 1310, G02B 2500

Patent

active

053113551

ABSTRACT:
An afocal zooming optical system includes, in order from the object side, an objective optical unit comprising a positive first lens group, an erecting prism component and a negative second lens group, and an eyepiece optical unit comprising a three-element positive third lens group and a single-element positive fourth lens group, which system performs zooming by moving the second and third lens groups in different directions along the optical axis and satisfies certain conditions.

REFERENCES:
patent: 4909614 (1990-03-01), Itoh et al.
patent: 5194886 (1993-03-01), Mukai et al.

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