Viewing instrument

Winding – tensioning – or guiding – Coil holder or support – Spool or core

Patent

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Details

242 76, 350133, 350239, G02B 2702

Patent

active

041451180

ABSTRACT:
An instrument for the individual viewing of pictures disposed successively on a transparent film strip, with a housing in which a binocular viewing window and a lens system enlarging the viewing angle and located in the ray path between viewing window and object are provided, and with holding and guiding means holding the film strip in a viewing plane, wherein the beam paths or optical axes associated with the two viewing windows are brought together approximately in the center of a common picture aperture lying in the viewing plane, and wherein the film strip guiding and holding means has a back support which supports the film strip during the positive and/or frictional engagement of an externally operable mechanical transport device with the film.

REFERENCES:
patent: 1167425 (1916-01-01), Ott
patent: 1240905 (1917-09-01), Troppman
patent: 2337567 (1943-12-01), North et al.
patent: 2372192 (1945-03-01), Fassel
patent: 2627781 (1953-02-01), Weborn
patent: 3850505 (1974-11-01), Ratliff
patent: 3891159 (1975-06-01), Nelson
patent: 3891311 (1975-06-01), Fletcher et al.
patent: 3967788 (1976-07-01), Ponce

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