US 11,953,857 B2
Illumination apparatus using a coherent light source
Makio Kurashige, Tokyo (JP)
Assigned to DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Filed on Sep. 15, 2020, as Appl. No. 17/021,466.
Application 15/212,673 is a division of application No. 14/455,434, filed on Aug. 8, 2014, granted, now 9,423,546.
Application 14/455,434 is a division of application No. 13/704,405, granted, now 8,848,267, previously published as PCT/JP2010/065692, filed on Sep. 7, 2010.
Application 17/021,466 is a continuation of application No. 15/212,673, filed on Jul. 18, 2016, granted, now 10,802,444.
Prior Publication US 2021/0103249 A1, Apr. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G03H 1/32 (2006.01); F21V 5/00 (2018.01); F21V 14/00 (2018.01); F21V 14/04 (2006.01); G02B 3/00 (2006.01); G02B 3/08 (2006.01); G02B 5/02 (2006.01); G02B 5/32 (2006.01); G02B 27/48 (2006.01); G03B 21/20 (2006.01); G03B 33/06 (2006.01); G03H 1/00 (2006.01); G03H 1/02 (2006.01); G03H 1/04 (2006.01); G03H 1/22 (2006.01); G03H 1/26 (2006.01); H04N 9/31 (2006.01); F21Y 115/10 (2016.01); F21Y 115/30 (2016.01)
CPC G03H 1/32 (2013.01) [F21V 5/004 (2013.01); F21V 14/00 (2013.01); F21V 14/04 (2013.01); G02B 3/0006 (2013.01); G02B 3/08 (2013.01); G02B 5/0252 (2013.01); G02B 5/32 (2013.01); G02B 27/48 (2013.01); G03B 21/2033 (2013.01); G03B 21/208 (2013.01); G03B 33/06 (2013.01); G03H 1/0005 (2013.01); G03H 1/02 (2013.01); G03H 1/0402 (2013.01); G03H 1/22 (2013.01); G03H 1/2286 (2013.01); H04N 9/3129 (2013.01); F21Y 2115/10 (2016.08); F21Y 2115/30 (2016.08); G03H 2001/0204 (2013.01); G03H 2001/0212 (2013.01); G03H 2001/0216 (2013.01); G03H 1/0244 (2013.01); G03H 1/0248 (2013.01); G03H 2001/0413 (2013.01); G03H 2001/0415 (2013.01); G03H 2001/0428 (2013.01); G03H 2001/0439 (2013.01); G03H 2001/045 (2013.01); G03H 2001/2292 (2013.01); G03H 2001/262 (2013.01); G03H 2222/36 (2013.01)] 1 Claim
OG exemplary drawing
 
1. An illumination apparatus using a coherent light source, comprising:
a coherent light source (50) that generates a coherent light beam (L50);
a light beam scanning device (60, 65) that carries out beam scanning by controlling either or both of a direction and a position of the light beam (L50); and
an optical diffusing element (45, 46) that diffuses an incident light beam and emits a light beam, wherein
the optical diffusing element (45, 46) includes a hologram recording medium,
the light beam scanning device (60, 65) guides a light beam (L50) generated by the coherent light source (50) toward the hologram recording medium (45, 46), and carries out scanning so that an incidence position and an incidence direction of the guided light beam (L60) on the hologram recording medium (45, 46) changes with time, and
the hologram recording medium (45, 46) has a function of forming irradiation regions (I) on a light receiving surface (R) by diffusing an incident light beam, wherein the light receiving surface is not a refractive element, and is configured so that the formed irradiation regions (I) become substantially a same common region on the light receiving surface (R) regardless of an incidence position of the incident light beam, said irradiation regions (I) being irradiated by light which is diffused by said hologram recording medium and reaches said light receiving surface (R).