Bright frame view-finder of natural lighting type additionally p

Details Bright frame view-finder of natural lighting type additionally p Bright frame view-finder of natural lighting type additionally p

1994-08-24

1997-09-09

Gray, David M.

Photography

Having camera indicator

Nonmechanical visual display

396296, G03B 1302

Patent

active

056665768

ABSTRACT:
Here is disclosed a bright frame view-finder of natural lighting type additionally provided with a light source for secondary diffusing surfaces comprising a secondary light generator plate and an additional lighting means so that the secondary light generator plate may be lighted by the additional lighting means and light images of a field frame and the like may be introduced into a view-finder optical system when the outdoor daylight or ambient light of sufficient intensity is unavailable for photographing. Specifically, the secondary light generator plate is formed with hologram of reflection or transmission type, or the secondary light generator plate comprises a transparent acryl plate having diffusing surfaces and the lighting means comprising a light emitting diode or the like is turned on when the outdoor daylight or ambient light of sufficient intensity is unavailable for intended photographing so that the field frame or the like on the field frame plate may be lighted by diffused light emitted from the secondary light generator plate and appear in the view-finder. When the outdoor daylight or ambient light of sufficient intensity is available for the intended photographing, the outdoor daylight or ambient light passing through the secondary light generator plate lights the field frame or the like and causes the latter to appear in the view-finder.

REFERENCES:
patent: 3903530 (1975-09-01), Taguchi et al.
patent: 4165930 (1979-08-01), Matsumoto et al.
patent: 4200380 (1980-04-01), Sato et al.
patent: 4527875 (1985-07-01), Shibata
patent: 4560264 (1985-12-01), Kitazawa et al.

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