Camera automatic exposure control apparatus

Details Camera automatic exposure control apparatus Camera automatic exposure control apparatus

1975-06-16

1977-08-02

Hix, L. T.

354 59, 354272, G03B 700

Patent

active

040401111

ABSTRACT:
An apparatus for automatic exposure control in a single lens reflex camera including an objective lens having a diaphragm regulating ring and a preselection ring forming part of a preselectable diaphragm means.
A photo-electric receiver controls the exposure.
A light regulating element having an adjusting device for varying the transparency thereof is provided in the light path from the lens and is positioned in front of the photo-electric receiver.
A coupling arrangement is provided in which a receiver diaphragm ring engages the lens diaphragm preselection ring.
First and second lugs are provided on the adjusting device of which the first lug can be coupled with the receiver diaphragm ring.
A spring loaded lug is provided on the diaphragm regulating ring.
A spring loaded unit is also provided having first and second entrainment devices and which can be released by the camera release device, the first entrainment device engaging with the spring loaded lug prior to actuation of the release device and the spring loaded unit moving in the opposite direction to that of the frictional connection of the first lug and the receiver diaphragm ring. The second entrainment device can be coupled with and is situated in the zone of movement of the second lug of the adjusting device at that distance from the second lug which corresponds to the difference between the preselected and the minimum transparency of the light regulating element.
Thus the light regulating element is adjusted by the coupling means from maximum transparency to a reduced transparency corresponding to the diaphragm setting of the preselectable diaphragm prior to exposure and on actuation of the camera release restored by the coupling means to maximum transparency simultaneously with the closure of the lens diaphragm to the preselected value.

REFERENCES:
patent: 3643575 (1972-02-01), Ono
patent: 3810206 (1974-05-01), Sokaguchi et al.
patent: 3827064 (1974-07-01), Kiyohara et al.

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