US PATENT SUBCLASS 352 / 198
PROJECTION LIGHT SOURCES

Current as of: June, 1999
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352 /   HD   OPTICS: MOTION PICTURES

198PROJECTION LIGHT SOURCES {5}
199  DF  .~> Synchronized with shutter
200  DF  .~> Intermittent light
201  DF  .~> Flicker reduction by auxiliary illumination
202  DF  .~> With ventilation and cooling
203  DF  .~> Projector illuminators

DEFINITION

Classification: 352/198

(under the class definition) Subject matter including means to provide or regulate the illumination in motion picture projectors.

(1) Note. The projection light sources as here classified include a light source together with some motion picture structure such as a gate or shutter. Class 362, Illumination, provides for illumination generally.

SEE OR SEARCH THIS CLASS, SUBCLASS:

28, for sound motion picture apparatus where the same light source is employed for the projection of the picture as well as for the sound transducer.

134, for plural motion picture projectors with a single light source.

167, for motion picture projection apparatus with means to effect a control of the intensity of the projection light source in response to the drive speed.