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Canadian Patents Database

Patent Summary

(12) Patent:    (11) CA 2372833

 (54) English   LASER PROJECTION APPARATUS WITH LIGHT VALVE AND SCANNING READING
    Title:      BEAM

 (54) French    APPAREIL DE PROJECTION LASER AVEC SOUPAPE D'ECLAIRAGE ET FAISCEAU
    Title:      DE LECTURE/BALAYAGE


                       •   Abstract
                       •   Patent Details

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                       •   Show all claims



Representative Drawing




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Abstracts
Third-party disclaimer

English Abstract




A laser projection system wherein speckle is suppressed through beam-path
displacement, by deflecting the beam during projection, thereby avoiding both
absorption and diffusion of the beam while preserving pseudocollimation
(noncrossing rays). Path displacement is achieved by scanning the beam on
liquid crystal light valves (LCLV's) (30), which also provide enhancements -
in energy efficiency, brightness, contrast, beam uniformity (by suppressing
both laser-mode ripple and artifacts). Preferably deflection is performed by a
mirror (20) mounted on a galvanometer or motor (21) for oscillation; images
are written incrementally on successive portions of an LCLV control stage
while the laser "reading beam" is synchronized on an output stage. Beam
splitter analyzer cubes (25) are preferred over polarizing sheets.




French Abstract

Les lignes laser à 635 nm ou plus (idéalement 647 nm) sont préférées pour le rouge, donnant
des images, satisfaisantes du point de vue énergétiques, brillantes et à mouvement rapide aux
couleurs riches et pleines comparables à un film. Les lignes vertes et bleues sont également
utilisées et le cyan retenu pour un bon mélange de couleurs, un survoltage supplémentaire
lumière couleur et sa contribution à la suppression du chatoiement. Ce chatoiement est supprimé
par le déplacement du parcours faisceau - par déviation du faisceau durant la projection, ce qui
supprime tant son absorption que sa diffusion tout en conservant la pseudo-collimation (rayons
non croisés), ce qui est important pour la netteté illimitée. Le déplacement du parcours est
obtenu par balayage du faisceau sur les valves à cristaux liquides (LCLV), ce qui donne lieu à
plusieurs améliorations en matière d'efficacité énergétique, de brillance, de contraste et
d'homogénéité du faisceau (par suppression à la fois des ondulations mode laser et des
artefacts) et une rotation de faisceau pratique pour le transfert de faisceau entre les étages de
l'appareil. C'est, de préférence, un miroir, monté sur un galvanomètre ou un moteur aux fins
d'une oscillation rotative, qui assure la déviation. Les images sont écrites de manière
incrémentielle sur des parties successives de l'étage de commande des LCLV (optique ou
électronique) tandis que le faisceau laser est synchronisé sur l'étage de sortie. Le faisceau est
façonné, avec très peu de pertes d'énergie, aux fins d'un masquage, en un profil transversal peu
profond qui est décalé sur l'écran de visualisation ainsi que sur les LCLV. Des cubes
analyseurs/diviseurs de faisceau sont préférés au-dessus de feuilles polarisantes. La modulation
spatiale assurée par une LCLV et maintenue par pseudo-collimation permet la formation
d'images sur des supports de projection irréguliers avec des parties à des distances différentes
du projecteur- y compris des dômes, des sculptures des monuments, des bâtiments, des chutes
d'eau, des embruns, du brouillard, des nuages, de la glace, des mousselines et autres structures
à étage, des arbres et autres frondaisons, des terres et des surfaces rocheuses et même des
assemblages de créatures vivantes, des personnes y compris.




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Patent Details
•   G03B 21/28 (2006.01)

(51) International Patent Classification             •   G03B 21/00 (2006.01)
                (IPC):

                                                     •   H04N 9/31 (2006.01)

                                                     •   TROYER, DIANE (United States of
         (72) Inventors (Country):
                                                         America)

                                                     •   TROYER, DIANE (United States of
           (73) Owners (Country):
                                                         America)

                                                     •   TROYER, DIANE (United States of
         (71) Applicants (Country):
                                                         America)

                 (74) Agent:                      SMART & BIGGAR

                (45) Issued:                      2013-01-15

            (86) PCT Filing Date:                 1999-04-30

         (87) PCT Publication Date:               1999-11-25

           Examination requested:                 2005-04-27

         (30) Availability of licence:            N/A

           (30) Language of filing:               English



  Patent Cooperation Treaty (PCT):             Yes

         (86) PCT Filing Number:               PCT/US1999/009501

(87) International Publication Number: WO1999/060443

            (85) National Entry:               2001-11-01



                                      Download Patent Image in          Size of     Number of
     View Patent Image                      PDF Format                Image (KB)      Pages
Cover Page                          Cover Page                             60              2
Abstract                            Abstract                               63              1
Claims                              Claims                                612              18
Description                         Description                          5,276         100
Drawings                            Drawings                              461              19
Download Patent Image in                Size of    Number of
      View Patent Image                      PDF Format                      Image (KB)     Pages
Representative Drawing              Representative Drawing                       19           1




Canadian Intellectual Property Office
http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2372833/claims.html?type=

Canadian Patents Database

Claims page


Patent Document Number: 2372833

(54) English Title: LASER PROJECTION APPARATUS WITH LIGHT VALVE AND SCANNING
READING BEAM




CLAIMS:

1. A laser projector comprising:

laser apparatus for projecting a picture beam that includes visible laser
light of wavelength equal to six hundred thirty-five nanometers or longer;

a reflective light valve for modulating the beam with a desired image;
and
means for directing the beam onto a face of the light valve to modulate
the beam with said desired image,

wherein the laser projector is adapted to project the beam with non-
crossing rays and to preserve spatial modulation in the projected beam.

2. The projector of claim 1, wherein:
light that appears red in the beam comprises substantially only said
laser light of wavelength equal to 635 nanometers or longer.

3. The projector of claim 1 or 2, wherein:
said apparatus is adapted for projecting a beam of wavelength between
635 and 650 nanometers.
4. The projector of claim 1 or 2, wherein:
said apparatus projects a beam of wavelength equal to 647 nanometers.

5. The projector of any one of claims 1 to 4, wherein:
the image is a moving picture.

6. The projector of any one of claims 1 to 5, further comprising:
means for also incorporating blue and green laser light into the picture
beam; and
separate, additional reflective light valves for modulating the blue and
green light respectively.

7. The projector of any one of claims 1 to 5, wherein:
said light valve also receives blue and green laser light for modulation,
within the same light valve.

8. The projector of claim 6, wherein said separate, additional reflective
light valves comprise liquid-crystal light valves.

9. The projector of any one of claims 1 to 8, wherein said reflective light
valve comprises a liquid-crystal reflective light valve.

10. The projector of any one of claims 1 to 5, further comprising:
further laser apparatus for projecting one or more beams that include
green and blue laser light; and

wherein the laser light of wavelength equal to 635 nanometers or longer
mixes with the green and blue laser light to provide substantially pure
neutral colors including pure white and pure black.

11. The projector of claim 10, wherein:
the further laser apparatus is adapted for projecting substantially cyan
light with the blue light or the green light, or both the blue light and the
green light.

12. The projector of claim 11, wherein the combination of said means for
scanning the beam, said light of wavelength equal to 635 nanometers or longer,
and
said cyan light, and the preservation of spatial modulation in the projected
beam, provides a suppression means for at least partly suppressing visible speckle
in a picture formed by said laser light on a projection medium.

13. The projector of claim 10, wherein one or both of (1) said means for
stage of the valve a live image optically coupled, without electronic intermediary, to the
control stage.

22. The projector of any one of claims 10 to 14, wherein:
the light valve is controlled by light substantially derived from a type of
traditional broadcast video signals; and

substantially no color correction or gamma adjustment is applied to
remove effects of using said 635-nanometer or longer-wavelength laser light
instead of broadcast video standard red.

23. The projector of any one of claims 10 to 13, wherein:
the first-mentioned laser apparatus and the further laser apparatus,
considered together, comprise one or more lasers; and
each laser in the first-mentioned laser apparatus and the further laser
apparatus is exclusively a solid-state laser.

24. The projector of any one of claims 10 to 13, wherein:
the first-mentioned laser apparatus and the further laser apparatus,
considered together, comprise one or more lasers; and

each laser in the first-mentioned laser apparatus and the further laser
apparatus is exclusively a gas laser.

25. The projector of any one of claims 1 to 9, further comprising:
further laser apparatus for projecting one or more beams that include
green and blue laser light; wherein:
the proportions of light power of the 635 nanometer or longer-
wavelength laser light, the green laser light and the blue laser light are
eight to six to five.

26. The projector of any one of claims 1 to 14:
wherein the light valve has a beam-modulation stage for impressing the
desired image onto the beam, and a control stage to control said impressing;
and the projector further comprises:

means for writing an image incrementally onto successive portions of
the control stage; and
means for directing the beam onto successive selected portions of the
modulation stage and means for generally synchronizing the directing means
with the image-writing means.

27. The projector of any one of claims 1 to 14, for use in forming an image
scanning the beam, and (2) said light of wavelength equal to 635 nanometers or

longer and (3) the preservation of spatial modulation in the projected beam,
provides a suppression means for at least partly suppressing visible speckle in a
picture formed by said laser light on a projection medium.

14. The projector of any one of claims 1 to 13, further comprising:
means for receiving high-bandwidth red, green and blue computer-
monitor signals from a computer;
wherein the projector serves as a high-color-fidelity computer monitor.

15. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
stage of the valve a vector, bitmap or other computer file scanned from an image or
generated in a computer.

16. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
stage of the valve amplitude-modulated laser-diode illumination swept two-dimensionally
across the control stage.

17. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
stage of the valve images from a small transmissive liquid-crystal display modulator, in
turn written by signals derived from a source other than traditional broadcast
video signals.

18. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
stage of the valve entire frames without interlace.

19. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
stage of the valve a motion-picture film.
20. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
stage of the valve a still image from a slide or overhead-projection transparency, or a
color separation made therefrom.

21. The projector of claim 14, wherein the reflective light valve is
controlled by light or control signals applied to the valve by writing onto a control
4. The projector of claim 1 or 2, wherein:
said apparatus projects a beam of wavelength equal to 647 nanometers.

5. The projector of any one of claims 1 to 4, wherein:
the image is a moving picture.

6. The projector of any one of claims 1 to 5, further comprising:
means for also incorporating blue and green laser light into the picture
beam; and
separate, additional reflective light valves for modulating the blue and
green light respectively.

7. The projector of any one of claims 1 to 5, wherein:
said light valve also receives blue and green laser light for modulation,
within the same light valve.

8. The projector of claim 6, wherein said separate, additional reflective
light valves comprise liquid-crystal light valves.

9. The projector of any one of claims 1 to 8, wherein said reflective light
valve comprises a liquid-crystal reflective light valve.

10. The projector of any one of claims 1 to 5, further comprising:
further laser apparatus for projecting one or more beams that include
green and blue laser light; and

wherein the laser light of wavelength equal to 635 nanometers or longer
mixes with the green and blue laser light to provide substantially pure
neutral colors including pure white and pure black.

11. The projector of claim 10, wherein:
the further laser apparatus is adapted for projecting substantially cyan
light with the blue light or the green light, or both the blue light and the
green light.

12. The projector of claim 11, wherein the combination of said means for
scanning the beam, said light of wavelength equal to 635 nanometers or longer,
and
said cyan light, and the preservation of spatial modulation in the projected
beam, provides a suppression means for at least partly suppressing visible speckle
in a picture formed by said laser light on a projection medium.

13. The projector of claim 10, wherein one or both of (1) said means for

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Troyer Canadian Patent Jan. 15, 2013; laser apparatus projector-- Z*Tron Vision

  • 1. Canadian Patents Database Patent Summary (12) Patent: (11) CA 2372833 (54) English LASER PROJECTION APPARATUS WITH LIGHT VALVE AND SCANNING READING Title: BEAM (54) French APPAREIL DE PROJECTION LASER AVEC SOUPAPE D'ECLAIRAGE ET FAISCEAU Title: DE LECTURE/BALAYAGE • Abstract • Patent Details • View or Download Images • View Administrative Status • Show all claims Representative Drawing Top of Page Abstracts
  • 2. Third-party disclaimer English Abstract A laser projection system wherein speckle is suppressed through beam-path displacement, by deflecting the beam during projection, thereby avoiding both absorption and diffusion of the beam while preserving pseudocollimation (noncrossing rays). Path displacement is achieved by scanning the beam on liquid crystal light valves (LCLV's) (30), which also provide enhancements - in energy efficiency, brightness, contrast, beam uniformity (by suppressing both laser-mode ripple and artifacts). Preferably deflection is performed by a mirror (20) mounted on a galvanometer or motor (21) for oscillation; images are written incrementally on successive portions of an LCLV control stage while the laser "reading beam" is synchronized on an output stage. Beam splitter analyzer cubes (25) are preferred over polarizing sheets. French Abstract Les lignes laser à 635 nm ou plus (idéalement 647 nm) sont préférées pour le rouge, donnant des images, satisfaisantes du point de vue énergétiques, brillantes et à mouvement rapide aux couleurs riches et pleines comparables à un film. Les lignes vertes et bleues sont également utilisées et le cyan retenu pour un bon mélange de couleurs, un survoltage supplémentaire lumière couleur et sa contribution à la suppression du chatoiement. Ce chatoiement est supprimé par le déplacement du parcours faisceau - par déviation du faisceau durant la projection, ce qui supprime tant son absorption que sa diffusion tout en conservant la pseudo-collimation (rayons non croisés), ce qui est important pour la netteté illimitée. Le déplacement du parcours est obtenu par balayage du faisceau sur les valves à cristaux liquides (LCLV), ce qui donne lieu à plusieurs améliorations en matière d'efficacité énergétique, de brillance, de contraste et d'homogénéité du faisceau (par suppression à la fois des ondulations mode laser et des artefacts) et une rotation de faisceau pratique pour le transfert de faisceau entre les étages de l'appareil. C'est, de préférence, un miroir, monté sur un galvanomètre ou un moteur aux fins d'une oscillation rotative, qui assure la déviation. Les images sont écrites de manière incrémentielle sur des parties successives de l'étage de commande des LCLV (optique ou électronique) tandis que le faisceau laser est synchronisé sur l'étage de sortie. Le faisceau est façonné, avec très peu de pertes d'énergie, aux fins d'un masquage, en un profil transversal peu profond qui est décalé sur l'écran de visualisation ainsi que sur les LCLV. Des cubes analyseurs/diviseurs de faisceau sont préférés au-dessus de feuilles polarisantes. La modulation spatiale assurée par une LCLV et maintenue par pseudo-collimation permet la formation d'images sur des supports de projection irréguliers avec des parties à des distances différentes du projecteur- y compris des dômes, des sculptures des monuments, des bâtiments, des chutes d'eau, des embruns, du brouillard, des nuages, de la glace, des mousselines et autres structures à étage, des arbres et autres frondaisons, des terres et des surfaces rocheuses et même des assemblages de créatures vivantes, des personnes y compris. Top of Page Patent Details
  • 3. G03B 21/28 (2006.01) (51) International Patent Classification • G03B 21/00 (2006.01) (IPC): • H04N 9/31 (2006.01) • TROYER, DIANE (United States of (72) Inventors (Country): America) • TROYER, DIANE (United States of (73) Owners (Country): America) • TROYER, DIANE (United States of (71) Applicants (Country): America) (74) Agent: SMART & BIGGAR (45) Issued: 2013-01-15 (86) PCT Filing Date: 1999-04-30 (87) PCT Publication Date: 1999-11-25 Examination requested: 2005-04-27 (30) Availability of licence: N/A (30) Language of filing: English Patent Cooperation Treaty (PCT): Yes (86) PCT Filing Number: PCT/US1999/009501 (87) International Publication Number: WO1999/060443 (85) National Entry: 2001-11-01 Download Patent Image in Size of Number of View Patent Image PDF Format Image (KB) Pages Cover Page Cover Page 60 2 Abstract Abstract 63 1 Claims Claims 612 18 Description Description 5,276 100 Drawings Drawings 461 19
  • 4. Download Patent Image in Size of Number of View Patent Image PDF Format Image (KB) Pages Representative Drawing Representative Drawing 19 1 Canadian Intellectual Property Office http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2372833/claims.html?type= Canadian Patents Database Claims page Patent Document Number: 2372833 (54) English Title: LASER PROJECTION APPARATUS WITH LIGHT VALVE AND SCANNING READING BEAM CLAIMS: 1. A laser projector comprising: laser apparatus for projecting a picture beam that includes visible laser light of wavelength equal to six hundred thirty-five nanometers or longer; a reflective light valve for modulating the beam with a desired image; and means for directing the beam onto a face of the light valve to modulate the beam with said desired image, wherein the laser projector is adapted to project the beam with non- crossing rays and to preserve spatial modulation in the projected beam. 2. The projector of claim 1, wherein: light that appears red in the beam comprises substantially only said laser light of wavelength equal to 635 nanometers or longer. 3. The projector of claim 1 or 2, wherein: said apparatus is adapted for projecting a beam of wavelength between 635 and 650 nanometers.
  • 5. 4. The projector of claim 1 or 2, wherein: said apparatus projects a beam of wavelength equal to 647 nanometers. 5. The projector of any one of claims 1 to 4, wherein: the image is a moving picture. 6. The projector of any one of claims 1 to 5, further comprising: means for also incorporating blue and green laser light into the picture beam; and separate, additional reflective light valves for modulating the blue and green light respectively. 7. The projector of any one of claims 1 to 5, wherein: said light valve also receives blue and green laser light for modulation, within the same light valve. 8. The projector of claim 6, wherein said separate, additional reflective light valves comprise liquid-crystal light valves. 9. The projector of any one of claims 1 to 8, wherein said reflective light valve comprises a liquid-crystal reflective light valve. 10. The projector of any one of claims 1 to 5, further comprising: further laser apparatus for projecting one or more beams that include green and blue laser light; and wherein the laser light of wavelength equal to 635 nanometers or longer mixes with the green and blue laser light to provide substantially pure neutral colors including pure white and pure black. 11. The projector of claim 10, wherein: the further laser apparatus is adapted for projecting substantially cyan light with the blue light or the green light, or both the blue light and the green light. 12. The projector of claim 11, wherein the combination of said means for scanning the beam, said light of wavelength equal to 635 nanometers or longer, and said cyan light, and the preservation of spatial modulation in the projected beam, provides a suppression means for at least partly suppressing visible speckle in a picture formed by said laser light on a projection medium. 13. The projector of claim 10, wherein one or both of (1) said means for
  • 6. stage of the valve a live image optically coupled, without electronic intermediary, to the control stage. 22. The projector of any one of claims 10 to 14, wherein: the light valve is controlled by light substantially derived from a type of traditional broadcast video signals; and substantially no color correction or gamma adjustment is applied to remove effects of using said 635-nanometer or longer-wavelength laser light instead of broadcast video standard red. 23. The projector of any one of claims 10 to 13, wherein: the first-mentioned laser apparatus and the further laser apparatus, considered together, comprise one or more lasers; and each laser in the first-mentioned laser apparatus and the further laser apparatus is exclusively a solid-state laser. 24. The projector of any one of claims 10 to 13, wherein: the first-mentioned laser apparatus and the further laser apparatus, considered together, comprise one or more lasers; and each laser in the first-mentioned laser apparatus and the further laser apparatus is exclusively a gas laser. 25. The projector of any one of claims 1 to 9, further comprising: further laser apparatus for projecting one or more beams that include green and blue laser light; wherein: the proportions of light power of the 635 nanometer or longer- wavelength laser light, the green laser light and the blue laser light are eight to six to five. 26. The projector of any one of claims 1 to 14: wherein the light valve has a beam-modulation stage for impressing the desired image onto the beam, and a control stage to control said impressing; and the projector further comprises: means for writing an image incrementally onto successive portions of the control stage; and means for directing the beam onto successive selected portions of the modulation stage and means for generally synchronizing the directing means with the image-writing means. 27. The projector of any one of claims 1 to 14, for use in forming an image
  • 7. scanning the beam, and (2) said light of wavelength equal to 635 nanometers or longer and (3) the preservation of spatial modulation in the projected beam, provides a suppression means for at least partly suppressing visible speckle in a picture formed by said laser light on a projection medium. 14. The projector of any one of claims 1 to 13, further comprising: means for receiving high-bandwidth red, green and blue computer- monitor signals from a computer; wherein the projector serves as a high-color-fidelity computer monitor. 15. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control stage of the valve a vector, bitmap or other computer file scanned from an image or generated in a computer. 16. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control stage of the valve amplitude-modulated laser-diode illumination swept two-dimensionally across the control stage. 17. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control stage of the valve images from a small transmissive liquid-crystal display modulator, in turn written by signals derived from a source other than traditional broadcast video signals. 18. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control stage of the valve entire frames without interlace. 19. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control stage of the valve a motion-picture film. 20. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control stage of the valve a still image from a slide or overhead-projection transparency, or a color separation made therefrom. 21. The projector of claim 14, wherein the reflective light valve is controlled by light or control signals applied to the valve by writing onto a control
  • 8. 4. The projector of claim 1 or 2, wherein: said apparatus projects a beam of wavelength equal to 647 nanometers. 5. The projector of any one of claims 1 to 4, wherein: the image is a moving picture. 6. The projector of any one of claims 1 to 5, further comprising: means for also incorporating blue and green laser light into the picture beam; and separate, additional reflective light valves for modulating the blue and green light respectively. 7. The projector of any one of claims 1 to 5, wherein: said light valve also receives blue and green laser light for modulation, within the same light valve. 8. The projector of claim 6, wherein said separate, additional reflective light valves comprise liquid-crystal light valves. 9. The projector of any one of claims 1 to 8, wherein said reflective light valve comprises a liquid-crystal reflective light valve. 10. The projector of any one of claims 1 to 5, further comprising: further laser apparatus for projecting one or more beams that include green and blue laser light; and wherein the laser light of wavelength equal to 635 nanometers or longer mixes with the green and blue laser light to provide substantially pure neutral colors including pure white and pure black. 11. The projector of claim 10, wherein: the further laser apparatus is adapted for projecting substantially cyan light with the blue light or the green light, or both the blue light and the green light. 12. The projector of claim 11, wherein the combination of said means for scanning the beam, said light of wavelength equal to 635 nanometers or longer, and said cyan light, and the preservation of spatial modulation in the projected beam, provides a suppression means for at least partly suppressing visible speckle in a picture formed by said laser light on a projection medium. 13. The projector of claim 10, wherein one or both of (1) said means for