Iris diaphragm for high speed photographic printers having improved speed and reliability
AssigneeEastman Kodak Company
InventorsMichael J. O'Brien, Richard A. Colleluori
Life of this patent
Estimating the term…
Abstract
An iris diaphragm for selectively varying a diameter of an aperture, the iris diaphragm comprises at least two movable blades which are adaptable for forming the aperture. A moveable drive coil drives the blades which motion of the drive coil provides unison movement with the blades, wherein the movement of the drive coil imparts motion to said blades for varying the aperture.
Claims25
An iris diaphragm for selectively varying a diameter of an aperture, the iris diaphragm comprising:
- (a) at least two movable blades which are adaptable for forming the aperture;
- (b) a moveable, electrically energizable drive coil which, when energized, rotates co-axially with one of said blades for providing unison movement with said blades, where the movement of said drive coil drives said blades for varying the aperture.
An iris diaphragm for selectively varying a diameter of an aperture, the iris diaphragm comprising:
- (a) at least two movable blades which are adaptable for forming the aperture;
- (b) a pivotal arm attached to said blades;
- and
- (c) a drive belt rigidly attached to said pivotal arm for providing cooperative movement of said blades for varying the diameter of the aperture.
A moveable drive actuator which imparts motion to blades of an iris diaphragm for varying an aperture, the drive actuator comprising:
- (a) a moveable, electrically energizable drive coil which, when energized, rotates co-axially with one of said blades for providing unison movement with said blades, wherein the movement of said drive coil drives said blades for varying the aperture;
- and
- (b) a magnet positioned adjacent said coil for cooperating with said coil in imparting motion to said drive coil.
A device for detecting malfunctioning of an iris diaphragm, the device comprising:
- (a) at least two movable blades which are adaptable for forming an aperture of the iris;
- (b) a drive belt extending around the blades for inducing motion to the blades;
- (c) two electrical conductors in electrical communication with said drive belt for detecting when a resistance of said drive belt is higher than a predetermined level for indicating the malfunctioning of the iris.
A photographic printer for selectively varying a diameter of an aperture, the printer comprising:
- (a) at least two movable blades which are adaptable for forming the aperture of said photographic printer;
- and
- (b) a movable drive coil which, when energized, rotates co-axially with one of the blades for providing unison movement with said blades, wherein the movement of said drive coil drives said blades for varying the aperture.
Dependencies are inferred from the claim text.