US PATENT SUBCLASS 356 / 25
.~ Periodically moving light interrupting element

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

23  DF  MOTION STOPPING (E.G., STROBOSCOPES) {2}
25.~ Periodically moving light interrupting element {1}
26  DF  .~.~> Vibrating or oscillating element

DEFINITION

Classification: 356/25

(under subclass 23) Subject matter wherein the periodic motion of an element containing alternate opaque and transparent areas is used to interrupt a light source.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

227+, for light valves utilzing an opaque element movable through a light path.