.~.~ With predetector light modifier (e.g., diaphragm)
DEFINITION
Classification: 356/225
(under subclass 218) Subject matter including an optical element such as a lens, shutter, diaphragm, or mirror in the light path to the light responsive device to modify the light coming to the device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
221, for photoelectric type detectors with optical structure rendering the detectors responsive to incident or back lighting.
224, for multi-range photometers whose sensitivity is controlled by an adjustable optical element in the detector light path.
233, for visual type photometers with variable light apertures.
432+, for testing the light transmission properties of materials.
SEE OR SEARCH CLASS 250, Radiant Energy,
216+, for photocells with pre-photocell optical elements.
359, Optics: Systems (Including Communication) and Elements,
483+, for light polarization devices, subclasses 558+ for light diffraction elements, subclass 615 for light dispersion elements, subclasses 642+ for lenses, subclasses 227+ for light control by opaque elements movable in a light path, subclass 831 for prisms, subclasses 838+ for light reflectors, subclasses 885+ for light filters, and subclasses 894+ for optical apertures and tubes.
385, Optical Waveguides, appropriate subclasses for fiber optics, per se.
