Light-sensitive control for colored light projector

• US 4,048,493 A
• Filed: 08/03/1976
• Issued: 09/13/1977
• Est. Priority Date: 08/03/1976
• Status: Expired due to Term

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Lee, Jerald Dana
• Primary Examiner(s): Nelms, David C.
• Application Number:
  US05/711,407
• Time in Patent Office: 406 Days
• Field of Search: 240/3.1, 240/46.59, 250/209, 250/226, 250/239, 250/205, 350/269, 356/96, 356/98
• US Class Current: 250/205
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: G09F 19/12 using special optical effects

Abstract

A device for producing variable colors from projected white light and quantifying the color changes resulting therefrom is provided which is useful in color-styling designs and color shade matching. The device comprises (1) an adjustable color filter having at least two primary-color areas upon which a portion of said projected white light is incident, (2) light-attenuation means which attenuates the quantity of light transmitted from (by attenuating either the incident white light or transmitted color light) each of the primary-color areas as well as the portion of the projected light which is transmitted unfiltered, and (3) control means comprising (a) a light-measuring unit for measuring the transmitted light and generating a signal proportional to the amount of light measured, (b) means responsive to said signal to determine the quantity of each component of transmitted light present and (c) means responsive to (b) for controlling each of the light-attenuation means.

A particularly preferred and useful embodiment involves a multiplicity of such devices arranged such that the portion of a common design imaged by each device is in registration at a common plane, with every other portion of the design imaged by the other devices.

Claims

1. A device for producing variable colors from projected white light comprising (1) an adjustable color filter having at least two primary-color areas upon which a portion of said projected white light is incident, (2) individually actuatable light-attenuation means which attenuates the quantity of light transmitted from each of the primary-color areas as well as the portion of the projected light which is transmitted unfiltered, and (3) control means comprising (a) a lightmeasuring unit for measuring the transmitted light and generating a signal proportional to the amount of light measured, (b) means responsive to said signal to determine the quantity of each component of transmitted light present and (c) means responsive to (b) for controlling each of the light-attenuation means.

2. The device of claim 1 wherein the color filter contains for primary-color areas in the order of red, blue, green and yellow represented by corresponding primary-color points on the chromaticity diagram.

3. The device of claim 2 wherein the light-attenuation means are shutters contained in a shutter mechanism consisting essentially of a plate having an aperture therein for passing the projected light therethrough and individually controllable shutters for each of the primary-color areas and for the portion of projected light which is transmitted through the aperture unfiltered.

4. The device of claim 2 wherein the adjustable color filter is rotatable about an axis perpendicular to the light attenuation means.

5. The device of claim 3 wherein the means for controlling each of the light-attenuation means is a servo mechanism having a servo motor for each of said light attenuation means.

6. The device of claim 1 wherein a transparency of a design is positioned to receive and transmit the transmitted light and masked so as to image a portion of the design in the color of the transmitted light.

7. The device of claim 3 wherein a transparency of a design is positioned to receive and transmit the transmitted light and masked so as to image a portion of the design in the color of the transmitted light.

8. The device of claim 1 wherein a multiplicity of such devices are arranged to image the transmitted light of each device in registration at a common plane.

9. The device of claim 6 wherein a multiplicity of such devices are arranged to image the portion of the design transmitted by the mask of each device in registration at a common plane.

10. The device of claim 7 wherein a multiplicity of such devices are arranged to image the portion of the design transmitted by the mask of each device in registration at a common plane.

11. The device of claim 8 wherein the light-measuring unit of each device is a common unit adjustable to measure the transmitted light from each device.

12. The device of claim 9 wherein the light-measuring unit of each device is a common unit adjustable to measure the transmitted light from each device.

13. The device of claim 10 wherein the light-measuring unit of each device is a common unit adjustable to measure the transmitted light from each device.

14. A device for producing variable colors from projected white light comprising (1) an adjustable color filter having four contiguous primary-color areas, (2) a shutter mechanism consisting essentially of a plate having an aperture therein for passing the projected light therethrough and three individually controllable shutters, each movable over a portion of the aperture, said filter positioned near and aligned with the aperture in a manner such that the projected white light controllable by one shutter is not transmittable through said filter and the projected white light controllable by the remaining two shutters is incident on any two contiguous color areas, and (3) measurement and control means comprising (a) a light-measuring unit for measuring transmitted light and generating an electrical signal proportional to the amount of light measured, (b) means electrically connected to the light-measuring unit which measures said electrical signal and determines the quantity of each transmitted component of the light present and (c) a servo mechanism responsive to (b) for controlling each of the three shutters.

15. The device of claim 14 wherein the four primary-color areas are in the order of red, blue, green and yellow and the two contiguous color areas on which the projected light is incident are represented by two corresponding primary-color points on the chromaticity diagram.

16. The device of claim 15 wherein the first shutter is movable to cover up to about one-half of the aperture and each of the remaining two shutters is movable to cover up to about one-quarter of the apertures.

17. The device of claim 16 wherein the color filter is rotatable about an axis perpendicular to the plane of the aperture.

18. The device of claim 17 wherein the servo mechanism includes three servo motors, one for each of the three shutters.

19. The device of claim 18 wherein the aperture has a diameter substantially the same size as the projected light image.

20. The device of claim 14 wherein a transparency design is positioned to receive and transmit the transmitted light and masked so as to image a portion of the design in the color of the transmitted light.

21. The device of claim 18 wherein a transparency of a design is positioned to receive and transmit the transmitted light and masked so as to image a portion of the design in the color of the transmitted light.

22. The device of claim 14 wherein a multiplicity of such devices are arranged to image the transmitted light of each device in registration at a common plane.

23. The device of claim 20 wherein a multiplicity of such devices are arranged to image the portion of the design transmitted by the mask of each device in registration at a common plane.

24. The device of claim 21 wherein a multiplicity of such devices are arranged to image the portion of the design transmitted by the mask of each device in registration at a common plane.

25. The device of claim 22 wherein the light-measuring unit of each device is a common unit adjustable to measure the transmitted light from each device.

26. The device of claim 23 wehrein the light-measuring unit of each device is a common unit adjustable to measure the transmitted light from each device.

27. The device of claim 24 wherein the lightmeasuring unit of each device is a common unit adjustable to measure the transmitted light from each device.

28. A multiple projection color simulator comprising:

at least two devices for producing variable colors from projected white light, each device comprising (a) a white light source, (b) an adjustable color filter having at least two primary-color areas, (c) a shutter mechanism consisting essentially of a plate having an aperture therein for passing the white light therethrough and three individually controllable shutters, each movable over a portion of the aperture, said filter positioned near and aligned with the aperture in a manner such that a portion of the white light passable through the aperture is not transmittable through said filter and is controllable by one shutter and the remaining white light passable through the aperture is incident on two of the primary-color areas and the remaining two shutters control the quantity of light transmittable from said two areas, and (d) a transparency of a design positioned to receive and transmit the light transmitted by the shutter mechanism and filter and masked so as to image a portion of the design in the color of the transmitted light, the transparency of each device being of a common design with a different portion masked, and arranged to image the portion of the design transmitted by the mask of each device in registration at a common plane.

29. The color simulator of claim 28 wherein the color filter is rotatable about an axis perpendicular to the plane of the aperture and has four contiguous primary-color areas in the order of red, blue, green and yellow and the two color areas on which the white light is incident are two contiguous areas represented by two corresponding primary-color points on the chromaticity diagram.

30. The color simulator of claim 29 wherein each device has means for controlling each of the three shutters.

31. The color simulator of claim 29 wherein the simulator has at least four devices for producing variable colors.