US PATENT SUBCLASS 352 / 217
.~.~.~.~ Dissolve

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

204  DF  SHUTTERS {3}
208  DF  .~ Rotary {7}
214  DF  .~.~ With axially spaced independently driven blades {2}
216  DF  .~.~.~ Variable aperture size {1}
217.~.~.~.~ Dissolve

DEFINITION

Classification: 352/217

(under subclass 216) Subject matter in which the aperture adjustment means is controlled by a power driven means operated by the drive of the motion picture mechanism so as to effect the adjustment at a predetermined rate relative to the position of the motion picture carrier.

(1) Note. In this subclass the aperture size is varied with time while in subclass 209 above the aperture size is varied with the shutter velocity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

91, for similar exposure or projection effects which are caused by apparatus which is auxiliary to the motion picture device.