(under subclass 89) Subject matter having a light responsive element used for another purpose besides focusing or rangefinding.
(1) Note. A dual purpose photoelement is, for example, a photoelement that monitors the brightness of a scene and transmits signals to an automatic focusing control circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111, for optical detail with photoelement system in focusing or rangefinding means.
162, for photocell in the termination control of an illumination means.
171, for photocell used as a flash trigger.
172, for photocell measuring the light output of an artificial illumination means.
