WO1998000689A1 - System for controlling the spectral distribution of light - Google Patents

System for controlling the spectral distribution of light Download PDF

Info

Publication number
WO1998000689A1
WO1998000689A1 PCT/US1997/011585 US9711585W WO9800689A1 WO 1998000689 A1 WO1998000689 A1 WO 1998000689A1 US 9711585 W US9711585 W US 9711585W WO 9800689 A1 WO9800689 A1 WO 9800689A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
pixels
wavelengths
dispersing
power distribution
Prior art date
Application number
PCT/US1997/011585
Other languages
French (fr)
Inventor
John J. Galt
James B. Pearman
Original Assignee
Sony Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Electronics Inc. filed Critical Sony Electronics Inc.
Priority to AU36490/97A priority Critical patent/AU3649097A/en
Publication of WO1998000689A1 publication Critical patent/WO1998000689A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0254—Spectrometers, other than colorimeters, making use of an integrating sphere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/12—Generating the spectrum; Monochromators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0229—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters

Definitions

  • This invention relates to programmable light sources, and more particularly, to a system for controlling spectral power distribution of light by utilizing a spatial light modulator
  • a filter device may be used to modify the spectral power distribution of a light source to provide a specific output
  • One type of filter device is a colored filter such as a dyed glass, gelatin or plastic filter .
  • an interference filter may be used which provides more precise control of spectral bandpass
  • programmable devices such as filter changers and additive color lamp houses Such devices mix three or more colored light sources to produce a modified color output
  • the actual spectral power distribution of the output of such devices is only controlled within the number of spectral bands for which an attenuation system is provided, which is typically two to four at most Therefore, it is desirable to provide a system which enables specific control of the spectral power distribution of a light source
  • a system for controlling spectral power distribution of light generated by a light source includes a collimating element for collimating the light to form collimated light.
  • the system includes a dispersing element for dispersing the collimated light into a plurality of component wavelengths each having an amplitude, wherein the plurality of component wavelengths form an input spectral power distribution whose energy level varies.
  • the system includes a light modulating element having an array of pixels which may be turned on or off by a controller. Each of the component wavelengths impinges on a corresponding set of pixels to form a plurality of pixel sets each associated with a component wavelength.
  • First pixels in each pixel set are turned off to form blocking elements for blocking transmission of light.
  • second pixels in each pixel set are turned on to form transmission elements for transmitting light through the light modulating element.
  • each pixel set forms a light passageway adapted for modulating the amplitude of the associated component wavelength to a desired intensity level to form an output spectral power distribution having a substantially constant light intensity level.
  • FIGURE 1 depicts an a prism and a spatial light modulator in accordance with the present invention.
  • FIGURES 2 A - 2C depict a spectral power distribution of input light, a distribution of wavelengths and associated intensity levels on a pixel array and an output spectral power distribution having a relatively constant energy level.
  • FIGURE 3 depicts a system for controlling spectral power distribution of light in accordance with the present invention.
  • a dispersion element such as a prism 10 is shown positioned adjacent to an addressable spatial light modulator 12.
  • the prism 10 serves to spatially separate, or disperse, input light 14 generated by a light source into its constituent wavelengths 16 (only blue and red are shown for purposes of clarity) each of which have an amplitude.
  • other types of dispersion elements may be used such as a diffraction grating or a graduated thickness interference filter.
  • FIGURE 2A an example of an input spectral power distribution 18 for the wavelengths 16 is shown.
  • the input spectral power distribution 18 illustrates a plurality of spectral peaks 20 indicating various amplitude or intensity levels for the wavelengths 16. In accordance with the present invention, it is desirable to control or modulate the intensity level of each of the wavelengths 16 to provide a specific or desired spectral power distribution.
  • the light modulator 12 includes an array of pixels 22.
  • Each of the pixels 22 may be selectively turned on or off by a controller such that each of the pixels 22 forms either a transmitting element 24 (shown as white squares) for transmitting light through the light modulator or a blocking element 26 (shown as black squares) for blocking transmission of light, respectively.
  • a transmitting element 24 shown as white squares
  • a blocking element 26 shown as black squares
  • light modulators such as those manufactured by DISPLAYTECH, TEXAS INSTRUMENTS and MEADOWL.ARK OPTICAL may be used.
  • the wavelengths 16 impinge on the light modulator 12 such that the wavelengths 16 and their associated amplitudes are imaged in the horizontal and vertical directions, respectively, of the light modulator 12.
  • first pixels 32 in the first pixel set 28 are turned off thus forming blocking elements.
  • second pixels 34 in the first pixel set 28 are turned on thus forming transmission elements.
  • the first pixel set 28 forms a "slit" or light passageway in the vertical direction in FIGURE 2B through which its associated wavelength passes.
  • the blocking and transmission elements in the first pixel set 28 are selected such the light passageway is sized for modulating the amplitude of the associated wavelength to provide a desired intensity level.
  • pixels 22 in the other pixel sets are turned on or off to form additional light passageways each of which are sized so as to modulate the amplitude of the associated wavelength to substantially the same intensity level.
  • an output spectral power distribution 36 for the wavelengths 16 is shown.
  • the amplitudes are modulated so that the intensity levels of each of the wavelengths 16 are substantially equal to each other.
  • the input spectral power distribution 18 shown in FIGURE 2A which depicts various intensity levels for each of the wavelengths, is modified to form a desired output spectral power distribution 36 as shown in FIGURE 2C having a relatively constant intensity level 38.
  • a system 40 for controlling spectral power distribution of light is shown.
  • the system 40 includes a collimating element 42 positioned between a light source 44 and a dispersion element such as a variable thickness interference filter 46.
  • a dispersion element such as a variable thickness interference filter 46.
  • filters include a variable thickness interference coating which varies the transmitted wavelength as a function of coating thickness along the length of the filter 46.
  • the light source 44 generates achromatic light 47 whose spectral power distribution is to be controlled
  • the light 47 is then collimated by the collimating element 42 to form collimated light 48.
  • the collimating element 42 may include a plano-convex lens 43 and a diverging lens 45, although other configurations for collimating light may be used.
  • the collimated light 48 then impinges on the filter 46 which disperses the light into its constituent wavelengths 50.
  • the system 40 further includes the light modulator 12 upon which each of the wavelengths 50 impinge and an integrating sphere 52 having input 54 and output 56 ports and a cavity 58.
  • the pixels 22 in the light modulator 12 are turned on or off by a controller 60 so as to provide suitable modulation of the amplitudes of each of the wavelengths 50 to form the spectral power distribution 60 described in connection with FIGURES 2A - 2C.
  • the wavelengths 50 then enter the input port 54 and are integrated within the cavity 58 to form integrated light in a well known manner.
  • the integrated light then exits through the output port 56 and serves as a light source 62.
  • the sphere 52 further includes a fiber probe or other light sensing element 64 which provides signals indicative of selected wavelength characteristics such as intensity level.
  • the signals are then sent to a spectrometer 66 which serves as a calibration reference for determining whether or not a desired intensity level is achieved.
  • the controller 60 then adjusts the number of pixels 22 which are turned or off in each pixel set in order to achieve the desired intensity level based on information provided by the spectrometer 66.

Abstract

A system for controlling spectral power distribution of light generated by a light source is disclosed. The system includes a collimating element for collimating the light to form collimated light. In addition, the system includes a dispersing element for dispersing the collimated light into a plurality of component wavelengths each having an amplitude, wherein the plurality of component wavelengths form an input spectral power distribution whose energy level varies. Further, the system includes a light modulating element having an array of pixels which may be turned on or off by a controller. Each of the component wavelengths impinges on a corresponding set of pixels to form a plurality of pixel sets each associated with a component wavelength. First pixels in each pixel set are turned off to form blocking elements for blocking transmission of light. In addition, second pixels in each pixel set are turned on to form transmission elements for transmitting light through the light modulating element. As such, each pixel set forms a light passageway adapted for modulating the amplitude of the associated component wavelength to a desired intensity level to form an output spectral power distribution having a substantially constant light intensity level.

Description

SYSTEM FOR CONTROLLING THE SPECTRAL DISTRIBUTION OF LIGHT
FIELD OF THE INVENTION
This invention relates to programmable light sources, and more particularly, to a system for controlling spectral power distribution of light by utilizing a spatial light modulator
BACKGROUND OF THE INVENTION
There are many applications in which it is desirable to have a light source which has a specific spectral power distribution These include applications such as color correction for telecine, colorimetry, photography, spectrometry, film scanning, color photocopying, multi- spectral signal analysis and others. However, the light sources that are utilized often do not have ideal spectral power distributions A filter device may be used to modify the spectral power distribution of a light source to provide a specific output One type of filter device is a colored filter such as a dyed glass, gelatin or plastic filter .Alternatively, an interference filter may be used which provides more precise control of spectral bandpass
In addition, programmable devices may be used such as filter changers and additive color lamp houses Such devices mix three or more colored light sources to produce a modified color output However, the actual spectral power distribution of the output of such devices is only controlled within the number of spectral bands for which an attenuation system is provided, which is typically two to four at most Therefore, it is desirable to provide a system which enables specific control of the spectral power distribution of a light source
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a system which enables specific control of the spectral power distribution of a light source It is a further object of the present invention to provide a system which enables specific control of the spectral power distribution of a light source having fractional wavelength resolution.
These and other objects, advantages and features of the invention will become apparent to those skilled in the art upon consideration of the following description of the invention.
According to one aspect of the present invention, a system for controlling spectral power distribution of light generated by a light source is disclosed. The system includes a collimating element for collimating the light to form collimated light. In addition, the system includes a dispersing element for dispersing the collimated light into a plurality of component wavelengths each having an amplitude, wherein the plurality of component wavelengths form an input spectral power distribution whose energy level varies. Further, the system includes a light modulating element having an array of pixels which may be turned on or off by a controller. Each of the component wavelengths impinges on a corresponding set of pixels to form a plurality of pixel sets each associated with a component wavelength. First pixels in each pixel set are turned off to form blocking elements for blocking transmission of light. In addition, second pixels in each pixel set are turned on to form transmission elements for transmitting light through the light modulating element. As such, each pixel set forms a light passageway adapted for modulating the amplitude of the associated component wavelength to a desired intensity level to form an output spectral power distribution having a substantially constant light intensity level.
The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, both as to organization and method of operation, together with further objects and advantages thereof, may be best understood by reference to the following description taken in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 depicts an a prism and a spatial light modulator in accordance with the present invention.
FIGURES 2 A - 2C depict a spectral power distribution of input light, a distribution of wavelengths and associated intensity levels on a pixel array and an output spectral power distribution having a relatively constant energy level.
FIGURE 3 depicts a system for controlling spectral power distribution of light in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail specific embodiments, with the understanding that the present disclosure is to be considered as an example of the principles of the invention and not intended to limit the invention to the specific embodiments shown and described. In the description below, like reference numerals are used to describe the same, similar or corresponding parts in FIGURES 1 -3.
Referring to FIGURE 1, an embodiment of the present invention is shown. In FIGURE 1, a dispersion element such as a prism 10 is shown positioned adjacent to an addressable spatial light modulator 12. The prism 10 serves to spatially separate, or disperse, input light 14 generated by a light source into its constituent wavelengths 16 (only blue and red are shown for purposes of clarity) each of which have an amplitude. In this regard, it is noted that other types of dispersion elements may be used such as a diffraction grating or a graduated thickness interference filter. Referring to FIGURE 2A, an example of an input spectral power distribution 18 for the wavelengths 16 is shown. The input spectral power distribution 18 illustrates a plurality of spectral peaks 20 indicating various amplitude or intensity levels for the wavelengths 16. In accordance with the present invention, it is desirable to control or modulate the intensity level of each of the wavelengths 16 to provide a specific or desired spectral power distribution.
Referring to FIGURE 2B in conjunction with FIGURE 1, the light modulator 12 includes an array of pixels 22. Each of the pixels 22 may be selectively turned on or off by a controller such that each of the pixels 22 forms either a transmitting element 24 (shown as white squares) for transmitting light through the light modulator or a blocking element 26 (shown as black squares) for blocking transmission of light, respectively. In this regard, it is noted that light modulators such as those manufactured by DISPLAYTECH, TEXAS INSTRUMENTS and MEADOWL.ARK OPTICAL may be used. The wavelengths 16 impinge on the light modulator 12 such that the wavelengths 16 and their associated amplitudes are imaged in the horizontal and vertical directions, respectively, of the light modulator 12. Each of the wavelengths 16 impinge on an associated set of pixels to form a plurality of associated pixel sets. For purposes of illustration, the present invention will be now described with reference to a first pixel set 28 that includes a first column of pixels 30. It is noted that this description also applies to other pixel sets. In accordance with the present invention, first pixels 32 in the first pixel set 28 are turned off thus forming blocking elements. In addition, second pixels 34 in the first pixel set 28 are turned on thus forming transmission elements. As such, the first pixel set 28 forms a "slit" or light passageway in the vertical direction in FIGURE 2B through which its associated wavelength passes. Further, the blocking and transmission elements in the first pixel set 28 are selected such the light passageway is sized for modulating the amplitude of the associated wavelength to provide a desired intensity level. Similarly, pixels 22 in the other pixel sets are turned on or off to form additional light passageways each of which are sized so as to modulate the amplitude of the associated wavelength to substantially the same intensity level.
Referring to FIGURE 2C, an output spectral power distribution 36 for the wavelengths 16 is shown. In accordance with the present invention, the amplitudes are modulated so that the intensity levels of each of the wavelengths 16 are substantially equal to each other. As previously described, it is desirable to have a light source which generates light having a specific power distribution. In accordance with the present invention, the input spectral power distribution 18 shown in FIGURE 2A, which depicts various intensity levels for each of the wavelengths, is modified to form a desired output spectral power distribution 36 as shown in FIGURE 2C having a relatively constant intensity level 38. Referring to FIGURE 3, a system 40 for controlling spectral power distribution of light is shown. The system 40 includes a collimating element 42 positioned between a light source 44 and a dispersion element such as a variable thickness interference filter 46. In particular, such filters include a variable thickness interference coating which varies the transmitted wavelength as a function of coating thickness along the length of the filter 46. The light source 44 generates achromatic light 47 whose spectral power distribution is to be controlled
The light 47 is then collimated by the collimating element 42 to form collimated light 48. In this regard, it is noted that the collimating element 42 may include a plano-convex lens 43 and a diverging lens 45, although other configurations for collimating light may be used. The collimated light 48 then impinges on the filter 46 which disperses the light into its constituent wavelengths 50. The system 40 further includes the light modulator 12 upon which each of the wavelengths 50 impinge and an integrating sphere 52 having input 54 and output 56 ports and a cavity 58. The pixels 22 in the light modulator 12 are turned on or off by a controller 60 so as to provide suitable modulation of the amplitudes of each of the wavelengths 50 to form the spectral power distribution 60 described in connection with FIGURES 2A - 2C. The wavelengths 50 then enter the input port 54 and are integrated within the cavity 58 to form integrated light in a well known manner. The integrated light then exits through the output port 56 and serves as a light source 62. The sphere 52 further includes a fiber probe or other light sensing element 64 which provides signals indicative of selected wavelength characteristics such as intensity level. The signals are then sent to a spectrometer 66 which serves as a calibration reference for determining whether or not a desired intensity level is achieved. The controller 60 then adjusts the number of pixels 22 which are turned or off in each pixel set in order to achieve the desired intensity level based on information provided by the spectrometer 66.
Thus it is apparent that in accordance with the present invention, an apparatus that fully satisfies the objectives, aims and advantages is set forth above. While the invention has been described in conjunction with specific embodiments, it is evident that many alternatives, modifications, permutations and variations will become apparent to those skilled in the art in light of the foregoing description. For example, pulse width modulation could be employed to vary the quantity of energy at a particular bandwidth. In addition, spectral power distributions having other than a constant intensity level may be generated as desired. Accordingly, it is intended that the present invention embrace all such alternatives, modifications and variations are far within the scope of the appended claims.

Claims

WHAT IS CLAIMED IS:
1 A system for controlling spectral power distribution of light generated by a light source, comprising a collimating element for collimating said light to form collimated light, a dispersing element for dispersing said collimated light into a plurality of component wavelengths each having an amplitude, said plurality of component wavelengths forming an input spectral power distribution whose intensity level varies; and a light modulating element having an array of pixels, wherein each of said component wavelengths impinges on a corresponding set of said pixels to form a plurality of pixel sets each associated with a component wavelength, wherein first pixels in each said pixel set are selected to be blocking elements for blocking transmission of light and second pixels in each said pixel set are selected to be transmission elements for transmitting light through said light modulating element, wherein each said pixel set forms a light passageway adapted for modulating said amplitude of said associated component wavelength to a desired intensity level to form amplitude modulated wavelengths having substantially equal intensity levels
2 The system according to claim 1, wherein said collimating element includes planoconvex and diverging lenses
3 The system according to claim 1, wherein said dispersing element is a prism
4 The system according to claim 1 , wherein said dispersing element is a variable thickness interference filter
5 The system according to claim 1, further including a controller for controlling said light modulating element such that selected pixels in each said pixel set are turned on or off as desired
6 A programmable light source, comprising a light source for generating light, a collimating element for collimating said light to form collimated light; a dispersing element for dispersing said collimated light into a plurality of component wavelengths each having an amplitude, said plurality of component wavelengths forming an input spectral power distribution whose intensity level varies; a light modulating element having an array of pixels, wherein each of said component wavelengths impinges on a corresponding set of said pixels to form a plurality of pixel sets each associated with a component wavelength, wherein first pixels in each said pixel set are selected to be blocking elements for blocking transmission of light and second pixels in each said pixel set are selected to be transmission elements for transmitting light through said light modulating element, wherein each said pixel set forms a light passageway adapted for modulating said amplitude of said associated component wavelength to a intensity level to form amplitude modulated wavelengths having substantially equal intensity levels; an integrating element for integrating said component wavelengths to form integrated light; and a controller for controlling said pixels to turn on or off to adjust an intensity level of said integrated light to provide a desired output spectral power distribution
7 The system according to claim 6, wherein said collimating element includes planoconvex and diverging lenses.
8 The system according to claim 6, wherein said dispersing element is a prism
9. The system according to claim 6, wherein said dispersing element is a variable thickness interference filter.
10. A method for controlling spectral power distribution of light generated by a light source, comprising: collimating said light to form collimated light; dispersing said collimated light into a plurality of component wavelengths each having an amplitude, said plurality of component wavelengths forming an input spectral power distribution whose intensity level varies; and forming light passageways for each of said wavelengths, said passageways being adapted for modulating each said amplitude to a desired intensity level to form amplitude modulated wavelengths having substantially equal intensity levels.
1 1. The method according to claim 10, wherein a collimating element having planoconvex and diverging lenses is used for said step of collimating.
12. The method according to claim 10, wherein a prism is used for said step of dispersing.
13. The method according to claim 10, wherein a variable thickness interference filter is used for said step of dispersing.
14. The method according to claim 10, further including the step of controlling pixels to form said light passageways.
15. The method according to claim 10, wherein a light modulator is used for said step of forming passageways.
PCT/US1997/011585 1996-07-01 1997-07-01 System for controlling the spectral distribution of light WO1998000689A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36490/97A AU3649097A (en) 1996-07-01 1997-07-01 System for controlling the spectral distribution of light

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67403296A 1996-07-01 1996-07-01
US08/674,032 1996-07-01

Publications (1)

Publication Number Publication Date
WO1998000689A1 true WO1998000689A1 (en) 1998-01-08

Family

ID=24705052

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/011585 WO1998000689A1 (en) 1996-07-01 1997-07-01 System for controlling the spectral distribution of light

Country Status (2)

Country Link
AU (1) AU3649097A (en)
WO (1) WO1998000689A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916981A1 (en) * 1997-11-17 1999-05-19 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. Confocal spectroscopy system and method
WO2005036112A1 (en) * 2003-10-06 2005-04-21 Oce Document Technologies Gmbh Device and method for emitting light
EP2600126A3 (en) * 2011-12-02 2013-08-07 Raytheon Company Variable monochromatic uniform calibration source
WO2014047517A1 (en) * 2012-09-20 2014-03-27 Myolite, Inc. Protective lighting system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193691A (en) * 1977-05-02 1980-03-18 Rca Corporation Spectrometer
US4600831A (en) * 1982-12-07 1986-07-15 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Apparatus to focus light on a surface based on color
US4915500A (en) * 1985-08-16 1990-04-10 The United States Of America As Represented By The Department Of Energy Multichannel optical sensing device
JPH03150528A (en) * 1989-11-08 1991-06-26 Fuji Photo Film Co Ltd Device for generating light having optional spectral distribution
US5090807A (en) * 1990-01-10 1992-02-25 Environmental Research Institute Of Michigan Real time optical pre-detection processing of multispectral image data
US5221959A (en) * 1990-03-16 1993-06-22 Olympus Optical Co., Ltd. Color discrimination data input apparatus
EP0548830A1 (en) * 1991-12-20 1993-06-30 Texas Instruments Incorporated Spectrometer with spatial light modulator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193691A (en) * 1977-05-02 1980-03-18 Rca Corporation Spectrometer
US4600831A (en) * 1982-12-07 1986-07-15 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Apparatus to focus light on a surface based on color
US4915500A (en) * 1985-08-16 1990-04-10 The United States Of America As Represented By The Department Of Energy Multichannel optical sensing device
JPH03150528A (en) * 1989-11-08 1991-06-26 Fuji Photo Film Co Ltd Device for generating light having optional spectral distribution
US5090807A (en) * 1990-01-10 1992-02-25 Environmental Research Institute Of Michigan Real time optical pre-detection processing of multispectral image data
US5221959A (en) * 1990-03-16 1993-06-22 Olympus Optical Co., Ltd. Color discrimination data input apparatus
EP0548830A1 (en) * 1991-12-20 1993-06-30 Texas Instruments Incorporated Spectrometer with spatial light modulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 380 (P - 1256) 25 September 1991 (1991-09-25) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916981A1 (en) * 1997-11-17 1999-05-19 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. Confocal spectroscopy system and method
US6128077A (en) * 1997-11-17 2000-10-03 Max Planck Gesellschaft Confocal spectroscopy system and method
WO2005036112A1 (en) * 2003-10-06 2005-04-21 Oce Document Technologies Gmbh Device and method for emitting light
EP2600126A3 (en) * 2011-12-02 2013-08-07 Raytheon Company Variable monochromatic uniform calibration source
US8861106B2 (en) 2011-12-02 2014-10-14 Raytheon Company Variable monochromatic uniform calibration source
WO2014047517A1 (en) * 2012-09-20 2014-03-27 Myolite, Inc. Protective lighting system

Also Published As

Publication number Publication date
AU3649097A (en) 1998-01-21

Similar Documents

Publication Publication Date Title
CA1097109A (en) Device for producing variable colors
US5479279A (en) Optimized color display device which uses a matrix to control the hue and uses a matrix to control color saturation
US6788408B2 (en) Wavelength monitoring system
US5121239A (en) Filter having adjustable spectral transmittance function
KR20020016843A (en) Color display
CA1250049A (en) Color imaging apparatus using electro-optic modulators
US11830456B2 (en) Remote color matching process and system
EP0057464A2 (en) Fibre-optic sensor
US4256368A (en) Color contrast sensitivity measuring device
JPH11101944A (en) Light source device
US4645319A (en) Composite optical image projection system
US4589015A (en) Color television camera with bias light device featuring reduced color shading
WO1998000689A1 (en) System for controlling the spectral distribution of light
CN100595636C (en) Electro-optical transducer and jelly layer therefor, method for producing a jelly layer and a compound for carrying out said method
US3314327A (en) Colorimeter employing tristimulus values
US20100296111A1 (en) Device and Method for the Representation of Body Colours
US4072858A (en) Laser beam intensity regulator
JP3790693B2 (en) Electronic color chart device
EP1150159A1 (en) Methode, system and projection apparatus for the visual representation of a digital image on a projection surface and light measuring instrument for this system
US5363232A (en) Device for controlling luminous energy
US6426810B1 (en) Illumination system for an electrooptic color display screen
US6485150B1 (en) Tunable spectral source
CA2139734C (en) Colour display device
DE3406175A1 (en) Spectral measuring head
CN103616076A (en) Color calibration device covering complete color gamut

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN YU AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH KE LS MW SD SZ UG ZW AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: CA

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 98504458

Format of ref document f/p: F

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase