Dual beam rangefinder

Details Dual beam rangefinder Dual beam rangefinder

1975-06-02

1977-01-25

O'Connor, Edna M.

354155, G03B 1320

Patent

active

040054470

ABSTRACT:
An improved dual beam rangefinder is used with an optical instrument having an objective lens with an afocal lens cell and a prime lens cell. A pair of spaced reflecting means are positioned intermediate the lens cells to intercept selected portions of the lightrays passing therethrough and transmit these rays to a viewfinder focal plane. One reflecting means is used in conjunction with a masking element which occludes off-axis rays from the reflector such that the reflected image therefrom at the focal plane is of finite size and positioned generally coincident to the central portion thereof.

REFERENCES:
patent: 3041919 (1962-07-01), Baur et al.
patent: 3125623 (1964-03-01), Leitz et al.
patent: 3397606 (1968-08-01), Leitz et al.
patent: 3618498 (1971-11-01), Eppinger
patent: 3696724 (1972-10-01), Hartmann

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