Patent ID: 7896500
Filing Date: 2011-03-01
Classification: G03B,H04N

Abstract:
1. A projection type image display device, comprising: a lamp unit; a cooling fan for cooling the lamp unit; an optical system for generating color image light with the lamp unit providing a light source; and a projection lens for projecting the generated color image light toward a screen, the lamp unit comprising wherein a center of the spherical portion of the light emitting tube forms an origin of an XYZ coordinate system having a Y-axis extending vertically, an X-axis extending in a light emission direction of the lamp unit and perpendicular to the Y-axis, and a Z-axis extending perpendicularly to both the X-axis and the Y-axis, and the air introduction hole of the reflector is provided in an area where a value of an X-coordinate in a direction opposite to the light emitting direction from the origin is not more than one-half the focal length of the reflector, a value of an X-coordinate in a light emission direction from the origin is not more than the focal length of the reflector, and an absolute value of a Y-coordinate is not more than an outside diameter of the spherical portion of the light emitting tube of the lamp unit.