LIGHTING DEVICE AND PROJECTOR

WIPO Patent Application WO/2005/036256

A1

A lighting device (100A) comprising an oval-surface reflector (130), a light emitting tube (120), an auxiliary mirror (122), and a collimating lens (140A), characterized in that the light incident surface (140Ai) of the collimating lens (140A) is formed with a reflection reducing film (142A) optimized to handle a light that is emitted, out of lights emitted from the light emitting center P of the light emitting tube (120), at any angle within 60&ring through 80&ring from the lighting light axis (100Ax) toward the oval-surface reflector side, and reflected off the reflector (130), and then enters the light incident surface (140Ai) of the collimating lens (140A). Accordingly, the lighting device can further reduce a reflectance at light entry surface or light exit surface of the collimating lens as a whole, further improve a light utilization efficiency, and further reduce an unneeded stray light. A projector, being provided with the lighting device able to further improve a light utilization efficiency and further reduce an unneeded stray light, can serve as a high-luminance, high-image-quality projector.

AKIYAMA KOICHI
YANO KUNIHIKO
HASHIZUME TOSHIAKI

PCT/JP2004/015578

April 21, 2005

October 14, 2004

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SEIKO EPSON CORP (JP)

F21V13/04; G03B21/14; (IPC1-7): G03B21/14

JP2003222820A	2003-08-08
JPH10311962A	1998-11-24
JPH06289394A	1994-10-18
JPH0864180A	1996-03-08
JPH10268106A	1998-10-09
JPH0794691A	1995-04-07
JP2002189101A	2002-07-05
JP2003107242A	2003-04-09

Kamiyanagi, Masataka c/o Seiko Epson Corporation (Intellectual Property Division 3-5, Owa 3-chom, Suwa-shi Nagano, JP)

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