Title:
照明装置及びこれを備えたプロジェクタ
Document Type and Number:
Japanese Patent JP4100430
Kind Code:
B2
Abstract:
A lighting unit including a light source lamp having a light emitting tube and an ellipsoid reflector, and an optical lens to parallelize illumination light released from the reflector, characterized in that: a first focal point P 1 , which is one of the two focal points P 1 and P 2 positioned inside and outside the reflector and is located on the side of the reflecting surface of the reflector, is contained within the light emitting tube, and a light emission center Q of the light emitting tube is offset in a virtual plane perpendicular to a reflector central axis OC; and a parallelizing lens has a lens optical axis on a reference axis L parallel to the reflector central axis OC, and the lens optical axis of the parallelizing lens is offset in a direction opposite to a direction where the emission center Q of the light emitting tube is offset from the reflector central axis OC.
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Inventors:
Shohei Fujisawa
Takezawa samurai
Takezawa samurai
Application Number:
JP2005506854A
Publication Date:
June 11, 2008
Filing Date:
June 07, 2004
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G03B21/14; F21S2/00; F21V7/00; G02B27/14; G02F1/13357; G03B21/20; H04N9/31
Domestic Patent References:
| JP2002244199A |
Foreign References:
| US3704936 |
Attorney, Agent or Firm:
Masahiko Ueyanagi
Osamu Suzawa
Osamu Suzawa