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Shutter assembly for a luminaire
| Details |
Inventors: Gennrich, David James; Roberts, Sheldon;
Assignee: Electronic Theatre Controls, Inc. (Middleton, WI)
Primary Examiner: Husar; Stephen
Assistant Examiner: Han; Jason
Attorney, Agent or Firm: Greer, Burns & Crain, Ltd., Kolehmainen; Philip M.
A shutter section includes a stack of circular plates independently rotatable in a nest formed as a laminar formation of rings. The plates have central openings defining a light path. Four central plates in the stack are shutter guide plates with radial guide slots slideably holding shutter blades. Two outer pairs of plates are shutter drive plates connected by cams to the shutter blades. Simultaneous rotation of a shutter guide plate and associated shutter drive plate causes rotation of an associated shutter blade around the light path. Rotation of a shutter drive plate while the associated shutter guide plate is stationary causes the cam to move the associated shutter blade radially. The nest is enclosed by end plates. A motor section has motors driving pinions to rotate the circular plates. The circular plates, rings pinions and shutter blades are made of sheet metal. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Having reference now to the drawing, a framing shutter assembly generally designated as 10 is seen in FIG.
1.
The shutter assembly 10 is constructed in accordance with the principles of the present invention and includes a shutter section 12 and a drive motor section 14.
In accordance with a feature of the invention, the components of the shutter section are made from sheet metal to provide a compact and inexpensive construction that is easily fabricated and assembled, and is sturdy, simple and reliable.
FIG.
2 is a simplified diagrammatic view of a theatrical luminaire 16 provided with the shutter assembly 10 of the present invention.
A luminaire housing 18 contains a light source including a reflector 20.
A beam 22 of light is emitted from the reflector 20 and travels in the direction of its longitudinal axis 24 through a lens system including rear and front optical lenses 26 and 28.
The light beam 22 is projected through a light exit opening 30 in the housing 18.
The shutter assembly 10 is mounted within the housing 18 at a focus point 32 of the reflected light beam 22.
The framing shutter assembly 10 includes four shutter blades 34, 36, 38 and 40.
Each of these blades 34-40 can be moved in a translational direction, radially inward or outward, in order to block a selected portion of the light beam 22.
In addition, each of the shutter blades 34-40 can be rotated around the axis 24.
The shutter blades 34-40 are preferably identical, although if desired they could differ in shape.
The shutter blades 34-40 have straight inner edges 42, although other configurations are possible.
The range of translational and rotational motion of the shutter blades 34-40 is such that the shutter assembly 10 can provide a projected beam of light having any three sided or four sided shape with a wide variation in size.
The shutter section 12 includes eight aligned, stacked circular plates or disks 44, 46, 48, 50, 52, 54, 56 and 58.
The circular plates form a stack 59
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