Patent ID: 7021794
Filing Date: 2006-04-04
Classification: G02B,G03B,H04N

Abstract:
1. A lighting unit, comprising: a light source lamp having a light emitting tube to emit illumination light and an ellipsoid reflector to reflect the illumination light emitted from the light emitting tube to release the illumination light in a fixed direction; and a parallelizing lens disposed on a side of a region to be lighted by the light source lamp to parallelize the illumination light released from the reflector, the reflector including a first focal point positioned inside a reflecting surface of the reflector, a second focal point positioned outside the reflecting surface of the reflector, and a reflector central axis on which the first and second focal points are positioned; the light emitting tube containing the first focal point within the light emitting tube, and a light emission center of the light emitting tube being offset from the first focal point in a virtual plane perpendicular to the reflector central axis; the parallelizing lens including a lens optical axis parallel to the reflector central axis, and the lens optical axis being offset from the reflector central axis in a direction opposite to a direction where the light emission center of the light emitting tube is offset from the first focal point of the reflector.