(under subclass 218) Subject matter wherein optical structure is associated with the light responsive device to collect light coming from a direction other than that reflected from the viewed object.
(1) Note. The optical structure is usually either a hemispherical light diffusing member or a reflector.
SEE OR SEARCH THIS CLASS, SUBCLASS:
225+, for photocell type photometers with light modifiers.
SEE OR SEARCH CLASS
250, Radiant Energy, 216+, for photocell circuits with pre-photocell or optical devices.
