Document Type and Number:
Japanese Patent JPS5260332
Kind Code:
U
Abstract:
The disclosure describes a compact and inexpensive optical system to be built in the viewfinder of a single-lens reflex camera for reading, in the viewfinder, an optical image of an indication element provided on the outside of the viewfinder. The optical system comprises a pentagonal Dach-prism having a light transmitting portion provided thereon, a first reflecting member and a second reflective member. The first and second reflective members have a specific positional relation to each other and also relative to the light transmitting portion of the prism so that an information carrying light beam coming from the indication element may reach the eyepiece of the viewfinder along a shortest possible light path.
Application Number:
JP14605375U
Publication Date:
May 02, 1977
Filing Date:
October 28, 1975
Export Citation:
International Classes:
G03B17/20; G03B19/12; (IPC1-7): G03B19/12; G03B17/20
Domestic Patent References:
| JPS3917581Y1 |
Foreign References:
| US3094911A | 1963-06-25 |