| US 7,530,719 B2 | ||
| Light source device and light deflection element | ||
| Tomoyoshi Yamashita, c/o Tokyo Technology and Information Center, Mitsubishi Rayon Co., Ltd. 3816, Noborito, Tama-ku, Kawasaki-shi, Kanagawa 2140014 (Japan); and Masae Ono, c/o Tokyo Technology and Information Center, Mitsubishi Rayon Co., Ltd. 3816, Noborito, Tama-ku, Kawasaki-shi, Kanagawa 2140014 (Japan) | ||
| Appl. No. 10/564,961 PCT Filed Jul. 12, 2004, PCT No. PCT/JP2004/009934 § 371(c)(1), (2), (4) Date Sep. 28, 2006, PCT Pub. No. WO2005/005881, PCT Pub. Date Jan. 20, 2005. |
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| Claims priority of application No. 2003-274733 (JP), filed on Jul. 15, 2003. | ||
| Prior Publication US 2007/0053206 A1, Mar. 08, 2007 | ||
| Int. Cl. F21V 7/04 (2006.01) | ||
| U.S. Cl. 362—600 [362/620; 362/626] | 28 Claims |
| 1. A light source device comprising: a light conductor which has a first light incident end surface and a second light incident
end surface that extend in substantially parallel directions relative to each other and that are positioned on mutually opposite
sides, and a light emitting surface; a first primary light source and a second primary light source which are disposed respectively
adjacent to said first light incident end surface and said second light incident end surface; and a light deflecting element
which has a light incident surface disposed facing said light emitting surface and a light emitting surface positioned on
the side opposite from this light incident surface, wherein
a directional light emitting functional part with an average inclination angle of 0.5 to 15° is formed on at least one surface
of said light conductor, i.e., the light emitting surface or the back surface positioned on the side opposite from this light
emitting surface,
a plurality of mutually parallel prism rows that extend in a direction substantially parallel to said first light incident
end surface and said second light incident end surface are formed on the light incident surface of said light deflecting element,
each of these prism rows has a first prism surface on the side close to said first primary light source and a second prism
surface on the side close to said second primary light source,
said first prism surface has a first region that extends in the direction of extension of said prism rows and a second region
that extends in the direction of extension of said prism rows,
the vertical angle of the prism rows is 80 to 120°, the difference in the angle of inclination between said first region and
said second region is 5 to 20°, and said second region has a smaller angle of inclination with respect to the normal direction
of the prism row formation plane than said first region.
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