(under subclass 213) Subject matter including structure for modifying the intensity or frequency of the input light or electric current responsive to the light, as by interrupting the current or chopping the light.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23, for stroboscopes.
48, for incandescent standard type optical pyrometers which use modulated light.
126, for lens or reflective image testing devices which use light modulators in focal length measurements.
151, for angle sides or axes alignment transverse to an optical axis type device which utilizes light modulators. 319+, for plural beam spectrophotometers which interrupt the light mechanically, electrically, or electro-optically.
322, for flicker beam absorption spectrophotometers.
323+, for modulation type spectrophoto meters.
387, for width or diameter of threads or web type measuring devices with light modulators.
418, for light modulating type colorimeters.
447, for light reflection from material which involves light modulation.
SEE OR SEARCH CLASS
332, Modulators, for electrical current modulators.
359, Optics: Systems (Including Communication) and Elements,
227+, for light controlled by an opaque element or medium movable in or through the light path.
