Camera exposure factor indicating device

Details Camera exposure factor indicating device Camera exposure factor indicating device

1977-12-21

1980-05-27

Adams, Russell E.

354 23D, 354 60L, G03B 1720

Patent

active

042047560

ABSTRACT:
A plate member bearing thereon a pair of first symbols respectively representative of the highest shutter speed and the lowest shutter speed, a pair of second symbols respectively representative of middle shutter speeds, and three letters or zone marks are arranged between the first and the second symbols and also between the second symbols. The plate member is disposed between a focussing plate and a pentagonal prism, which form a viewfinder of a single lens reflex camera. The first and second symbols are illuminated by light from outside of the camera, which light has passed through the focussing plate after being reflected by a movable mirror. For the illumination of the letters or the zone marks, three light emitting diodes are provided in corresponding relation to the letters or zone marks, and an electric circuit responsive to a light measuring circuit selectively continuously lights one of the three light emitting diodes when the brightness of an object to be photographed is at an appropriate level and selectively intermittently lights one of the two light emitting diodes corresponding to the letters or zone marks adjacent to the first symbols when the brightness of the object is at a level over or under the appropriate level. Also, three light guides are provided respectively in corresponding relation to the light emitting diodes and the letters or the zone marks for transmitting the light emitted from the corresponding light emitting diode to the corresponding letter or zone mark.

REFERENCES:
patent: 3818495 (1974-06-01), Sagara et al.
patent: 3895875 (1975-07-01), Kitaura et al.
patent: 3956758 (1976-05-01), Numata et al.
patent: 3967288 (1976-06-01), Yamamoto
patent: 3988069 (1976-10-01), Kitaura
patent: 3990799 (1976-11-01), Nanba et al.

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