# US 9,882,345 B2 · Laser light source, projector provided with laser light source, and method for manufacturing laser light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,345 B2 - Document ID: US9882345B2 - Status: Granted - Kind: B2 - Application number: 15/120,098 - Filed: 2014-04-24 - Published: 2017-05-04 - Granted: 2018-01-30 - Earliest claimed: 2014-04-24 - Assignees: NEC Display Solutions, Ltd. - Applicants: NEC Display Solutions, Ltd. - Inventors: Takashi Hiraga - Web page: https://patentgrep.com/patent/US9882345B2 ## CPC - H01S 5/0239: Combinations of electrical or optical elements - G03B 21/2033: {LED or laser light sources} - G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)} - H01S 5/4025: {Array arrangements, e.g. constituted by discrete laser diodes or laser bar (H01S5/42 takes precedence)} - H04N 9/3158: {for controlling the spectrum} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - H04N 9/3167: {for polarizing the light beam (polarizing optical systems per se G02B27/28)} - H04N 13/337: using polarisation multiplexing - H04N 13/363: using image projection screens (volumetric display H04N13/388) - H01S 5/4018: {Lasers electrically in series} - H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The laser light source as set forth in claim 1, wherein: said plurality of laser diodes are arranged in matrix form on said substrate. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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). ### Claim 5 (depends on 1) The laser light source as set forth in claim 1, wherein: a plurality of said substrates are provided. ### Claim 6 (depends on 5) 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. ### Claim 7 (depends on 5) 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. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 8) 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. ### Claim 10 (depends on 9) 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. ### Claim 11 (depends on 9) 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. ### Claim 12 (depends on 9) 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. ### Claim 13 (depends on 8) 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. ### Claim 14 (depends on 8) 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. ### Claim 15 (depends on 8) 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. ### Claim 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. ### Claim 17 (depends on 16) The laser light source manufacturing method according to claim 16, further comprising arranging said plurality of laser diodes in matrix form on said substrate. ### Claim 18 (depends on 16) 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. ### Claim 19 (depends on 16) 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). ### Claim 20 (depends on 16) The laser light source manufacturing method according to claim 16, further comprising providing a plurality of said substrates.