Laser light source, projector provided with laser light source, and method for manufacturing laser light source

Patent metadata

Field	Value
Publication number	US-9882345-B2
Application number	US-201415120098-A
Country	US
Kind code	B2
Filing date	Apr 24, 2014
Priority date	Apr 24, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

The present invention realizes both a laser light source that, despite the use of a plurality of laser diodes and transmission through a modulator that allows transmission of a specific orientation of linearly polarized light, is free from the occurrence of uneven luminance or uneven color, and a projector device that uses this laser light source. The laser light source is provided with a plurality of laser diodes that are mounted on a substrate and that emit linearly polarized light in the same direction. The plurality of laser diodes are arranged such that the orientation of the emitted linearly polarized light is different for each laser diode.

First claim

What is claimed is:

1. A laser light source comprising:
a plurality of laser diodes that are mounted on a substrate and that emit linearly polarized light; wherein:
said plurality of laser diodes are each provided with a first pin and a second pin and emit linearly polarized light of an orientation that accords with lines that connect the first pin and the second pin; and
said plurality of laser diodes are arranged such that an orientation of linearly polarized light that is emitted differs for said plurality of laser diodes.

2. The laser light source as set forth in claim 1 , wherein:
said plurality of laser diodes are arranged in matrix form on said substrate.

3. The laser light source as set forth in claim 1 , wherein:
the orientations of emitted linearly polarized light among the plurality of laser diodes are any one of equal-difference angles that make up an arithmetical progression within a range of from 0 to less than 180 degrees.

4. The laser light source as set forth in claim 1 , wherein:
the orientation of emitted linearly polarized light of each of the plurality of laser diodes is any one of 180×i/n degrees (where i=0, 1, 2, . . . , n−1).

5. The laser light source as set forth in claim 1 , wherein:
a plurality of said substrates are provided.

6. The laser light source as set forth in claim 5 , wherein:
on said plurality of substrates, the plurality of laser diodes that are mounted are similarly arranged.

7. The laser light source as set forth in claim 5 , wherein:
on said plurality of substrates, the plurality of mounted laser diodes are each arranged differently.

8. A projector comprising:
a light source device that is realized using the laser light source as set forth in claim 1 and that supplies light that contains the emitted light of said plurality of laser diodes;
an image-forming unit that uses the light from said light source device to form image light; and
a projection optical system that projects image light that was formed in said image forming unit.

9. The projector as set forth in claim 8 , further comprising:
a modulator that transmits light outputted from said projection optical system, wherein said modulator controls the orientation of linearly polarized light that is transmitted.

10. The projector as set forth in claim 9 , wherein:
said image-forming unit switches and generates right-eye image light and left-eye image light in a time series.

11. The projector as set forth in claim 9 , wherein:
said modulator transmits linearly polarized light of respectively different orientations when transmitting right-eye image light and left-eye image light.

12. The projector as set forth in claim 9 , wherein:
the light transmitted through said modulator is uniform regardless of a site on a projection surface.

13. The projector as set forth in claim 8 , wherein:
said image-forming unit switches and generates right-eye image light and left-eye image light in a time series.

14. The projector as set forth in claim 8 , wherein:
said image-forming unit switches and generates right-eye image light and left-eye image light.

15. The projector as set forth in claim 8 , wherein:
the orientations of emitted linearly polarized light among the plurality of laser diodes are any one of equal-difference angles that make up an arithmetical progression within a range of from 0 to less than 180 degrees.

16. A laser light source manufacturing method comprising:
arranging a plurality of laser diodes that emit linearly polarized light on a substrate such that an orientation of emitted linearly polarized light differs for said plurality of laser diodes, wherein
said plurality of laser diodes are each provided with a first pin and a second pin and emit linearly polarized light of an orientation that accords with lines that connect the first pin and the second pin.

17. The laser light source manufacturing method according to claim 16 , further comprising arranging said plurality of laser diodes in matrix form on said substrate.

18. The laser light source manufacturing method according to claim 16 , wherein:
the orientations of emitted linearly polarized light among the plurality of laser diodes are any one of equal-difference angles that make up an arithmetical progression within a range of from 0 to less than 180 degrees.

19. The laser light source manufacturing method according to claim 16 , wherein:
the orientation of emitted linearly polarized light of each of the plurality of laser diodes is any one of 180×i/n degrees (where i=0, 1, 2, . . . , n−1).

20. The laser light source manufacturing method according to claim 16 , further comprising providing a plurality of said substrates.

Assignees

• Nec Display Solutions Ltd

Inventors

• Hiraga Takashi

Classifications

• H01S5/022 Primary

  Mountings; Housings · CPC title

• H04N9/3158

  for controlling the spectrum · CPC title

• H01S5/4018

  Lasers electrically in series · CPC title

• G03B21/2033

  LED or laser light sources · CPC title

• G03B21/2073

  Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197) · CPC title