U.S. Patent Applications and co-pending patents by Light and Sound Design describe a stage lighting system which is run by stage lighting luminaries. Each of the luminaries includes a digitally controlled light shape altering device. The specific light shape altering device is the Texas Instruments digital micromirror device or “DMD”. This device is digitally controlled to produce shape altering outputs as well as effects on the light.
The present invention teaches a special trimmer iris, structure of the iris and aspects of use of such a trimmer iris, which produces advantages in a digitally controlled, pixel level device such as a DMD.
These and other aspects will now be described in accordance with the drawings, in which:
A basic layout of the system is shown in
Area 120 represents the part around the image, but still within the DMD. This is intended to be “black”, i.e., not to reflect any light at all. Due to stray reflection, however, it is viewed as some shade of gray. 125 represents the outer part of the shape; again which is intended to be black, but is not perfect black.
Since the image is formed by digital mirror parts, the edges of the mirrors may refract light and in any case form an imperfect black level.
Our co-pending application describes using a gate to block off light outside the digital mirror.
The present application addresses this issue by using a special trimmer iris 150 in the path of the light beam. The iris has a variable size central element which changes in size to basically track the size of the image on the DMD. The tracking can be automatic. The size of the trimmer iris can be a selected parameter that is set by the lighting designer.
Further detail on the driven piece is shown in
An outer pulley assembly is assembled around the iris. The pulley assembly is shown in
In operation, the device is held on a location plate as shown in FIG. 5. The location plate holds the pulley assembly and its internal iris in a specified location. A belt 500 is driven by a motor 505. The iris is driven to one end in order to reset and initialize. It can also be driven to the other end, in order to determine the end position also.
The image 115 on the digital mirror device 110 is produced by a processor, shown in
In this embodiment, the size of the mask automatically tracks the image on the DMD.
Other alternatives can also be used. The size of the image can be stored as part of a library of gobos, in the memory 165 associated with each gobo. This stored size can be used to set the iris.
Alternately, the size of the iris can be manually adjusted by the lighting designer as part of the show parameters.
Other embodiments are within the disclosed embodiment.
The present application is a continuation of U.S. application Ser. No. 09/779,196, filed Feb. 7, 2001, now U.S. Pat. No. 6,549,324 which claims benefit of U.S. provisional application Ser. No. 60/181,483, filed Feb. 10, 2000.
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Number | Date | Country | |
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20030206328 A1 | Nov 2003 | US |
Number | Date | Country | |
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60181483 | Feb 2000 | US |
Number | Date | Country | |
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Parent | 09779196 | Feb 2001 | US |
Child | 10409867 | US |