Optical instrument with a zoom lens structure

Details Optical instrument with a zoom lens structure Optical instrument with a zoom lens structure

1975-02-24

1976-12-28

Hix, L. T.

350255, 354199, G03B 302, G03B 1300

Patent

active

040005011

ABSTRACT:
A zoom lens structure for use with an optical instrument comprises a zooming optical system movable along the optical axis thereof and including a magnifying system and a correcting system; support frames for holding the zooming optical system; a plurality of guide shafts fitted in the support frames of the zooming optical system to cause sliding of the support frames; a frame member for holding the guide shafts at the opposite ends thereof and surrounding the zooming optical system; a fucusing optical system; a holder frame for permitting the focusing optical system to be moved along the optical axis independently of the zooming optical system; and a mechanism using a cam to drive the holder frame. Within the frame member surrounding the zooming optical system, a beam splitter for splitting an object light beam to derive a viewfinder light beam is interposed between the portion of the frame member remote from an object to be photographed and the zooming system. The side wall of the frame member is formed with an opening for passing therethrough the viewfinder light beam. Thus, the lengths over which the zooming optical system holder frames and the guide shafts are fitted together can be increased to enhance the zooming accuracy.

REFERENCES:
patent: 3062102 (1962-11-01), Martin
patent: 3095750 (1973-07-01), Mahn
patent: 3106125 (1963-10-01), Martin et al.
patent: 3399014 (1968-08-01), Butterfield et al.
patent: 3538832 (1970-11-01), Koeber, Jr.
patent: 3550518 (1970-12-01), Himmelsbach
patent: 3590713 (1971-07-01), Kirstein
patent: 3696725 (1972-10-01), Lange
patent: 3718076 (1973-02-01), Neda et al.

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