Discrete laser fiber inputs for image projectors

Patent metadata

Field	Value
Publication number	US-10114224-B2
Application number	US-201515540962-A
Country	US
Kind code	B2
Filing date	Dec 23, 2015
Priority date	Dec 31, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Discrete light fiber inputs for high powered image projector display systems are disclosed herein. Various embodiments disclosed herein may employ a bundle of light fiber inputs, a diffuser and reducing relay optic to convert the fiber input array into a smaller pattern of spots that may be interfaced to a projector display system that may perform light recycling. Many embodiments herein may facilitate higher power laser light for illumination and, possibly, recycling. In these embodiments, laser fibers may be individually collimated and illuminate a diffuser. The diffuser spots may be then imaged through a common path relay that can be resized to allow room for the individual lasers and collimation lenses. The diffuser spots may be imaged through holes in a mirror that is on the input side of an integration rod which recycles the light.

First claim

The invention claimed is:

1. An optical system, said optical system comprising:
a set of light fibers, said set transmitting light from at least one light source to an integrating rod;
a plurality of light fibers, each light fiber receiving light from a light source;
a collimating lens, the collimating lens receiving light from the plurality of light fibers;
a diffuser, the diffuser receiving light from the collimating lens;
a lens assembly, the lens assembly receiving light from the diffuser; and
an optical element, the optical element providing at least one aperture to receive light from the lens assembly to input light into and transmit through an integrating rod.

2. The optical system of claim 1 wherein each of the plurality of light fibers receives light from a corresponding light source.

3. The optical system of claim 2 wherein each corresponding light source is one of a group, said group comprising: a laser, a partially coherent light source, an LED and a high powered lamp.

4. The optical system of claim 1 wherein the collimating lens comprises a plurality of collimating lenses wherein each of the plurality of light fibers emits light to a corresponding collimating lens.

5. The optical system of claim 1 wherein the diffuser comprises a rotating diffuser.

6. The optical system of claim 1 wherein the optical element comprises a plurality of apertures wherein each aperture corresponds to one of the plurality of light fibers.

7. The optical system of claim 6 wherein the optical element comprises a mirrored element.

8. The optical system of claim 7 wherein the mirrored element provides for reflection of light within the integrating rod.

9. The optical system of claim 8 wherein the lens assembly focuses the light from the diffuser onto the plurality of apertures of the optical element.

10. The optical system of claim 9 wherein the integrating rod further comprises:
a first integrating rod;
a second integrating rod;
a strap, said strap mechanically mated to the first integrating rod and the second integrating rod, such that the end of the first integrating rod is proximal to the end of the second integrating rod; and
further wherein, the strap is glued to the first integrating rod and the second integrating rod.

11. The optical system of claim 10 wherein further
the strap comprises a material having substantially the same thermal expansion property of the first integrating rod.

12. The optical system of claim 11 wherein further the strap comprises glass.

13. The optical system of claim 12 wherein further the strap is glued to the first integrating rod and the second integrating rod by a first glue.

14. The optical system of claim 13 wherein further the first glue mating the strap to the first integrating rod and the second integrating rod has a lower index of refraction from the material comprising the integrating rods.

15. The optical system of claim 14 wherein the glue does not substantially disturb the internal reflectance of the first integrating rod.

16. The optical system of claim 15 wherein the glue comprises a thickness of greater than several multiples the wavelength of the light transmitted through the first integrating rod.

17. The optical system of claim 16 wherein an end of the first integrating rod is glued to an end of the second integrating rod by a second glue.

18. The optical system of claim 17 wherein the second glue comprises an index of refraction substantially the same as the material comprising the first integration rod.

19. The optical system of claim 18 further comprising an integrating rod module further comprising:
a brace, the brace mated to the strap and the brace further mated to a projector display system.

20. The optical system of claim 19 , wherein the brace is mated to the projector display system in such a manner as to orient the integrating rod module at an angle different from horizontal with respect to gravity.

21. The optical system of claim 20 wherein the length of the integrating rod module substantially allows more than one bounce of the light transmitted through the integrating rod module.

22. The optical system of claim 21 wherein the length of the integrating rod module comprising combined length of the first integrating rod and length of the second integrating rod, substantially provides uniform illumination to a first modulator.

23. A image projection display system, comprising:
a light source;
a plurality of light fibers, each light fiber receiving light from the light source;
a collimating lens, the collimating lens receiving light from the plurality of light fibers;
a diffuser, the diffuser receiving light from the collimating lens;
a lens assembly, the lens assembly receiving light from the diffuser; and
an optical element, the optical element providing at least one aperture to receive light from the lens assembly;
an integration rod module, the integration rod module receiving light from the optical element and transmitting light from said light source to a modulator; and
wherein the integration rod module further comprises:
a first integrating rod;
a second integrating rod;
a strap, said strap mechanically mated to the first integrating rod and the second integrating rod, such that one end of the first integrating rod is proximal to one end of the second integrating rod; and
further wherein, the strap is glued to the first integrating rod and the second integrating rod.

24. The image projection display system of claim 23 where further the integration rod module further comprises a brace, the brace mated to the strap and the brace further mated to the projection display system.

25. The image projection display system of claim 24 wherein the brace is mated to the projection display system in such a manner as to orient the integration rod module at an angle different from horizontal with respect to gravity.

Assignees

• Dolby Laboratories Licensing Corp

Inventors

• Dewald Duane Scott
• Wainwright Nathan
• Gorny Douglas J
• Richards Martin J

Classifications

• G03B21/208

  Homogenising, shaping of the illumination light · CPC title

• G02B27/30 Primary

  Collimators · CPC title

• G02B6/04

  formed by bundles of fibres (G02B6/24 takes precedence) · CPC title

• H04N9/3126

  for spatial light modulators in series · CPC title

• G02B6/32

  having lens focusing means {positioned between opposed fibre ends (with lens being an integral part of the single fibre end G02B6/262)} · CPC title