US PATENT SUBCLASS 352 / 216
.~.~.~ Variable aperture size

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.~.~.~ Variable aperture size {1}
217  DF  .~.~.~.~> Dissolve

DEFINITION

Classification: 352/216

(under subclass 214) Subject matter which includes means to adjust the relative position of the blades while the shutter is in operation so as to alter the size of the light passing aperture.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141, for devices which control the shutter aperture in response to variations in exposure parameters.

209, for rotary shutters whose aperture size is speed adjusted.

SEE OR SEARCH CLASS

396, Photography,

213+, for devices which adjust photos:graphic shutters in response to variation of exposure parameters.