Patent ID: 7771056
Filing Date: 2010-08-10
Classification: C03C,C08K,C08L,D06M,G03B

Abstract:
1. A projection type image display apparatus comprising: a lamp; an integrator for uniforming light emitted from the lamp, via a collimator lens; an illuminating optical system formed by a plurality of optical elements for focusing light outputted from the integrator; an image display element for modulating the focused light; a projection lens for projecting an optical image formed by the image display element; a first reflector disposed in a direction opposite to the integrator as viewed from the lamp; and a second reflector disposed between the lamp and the integrator, and formed with a notched portion, centered on the same direction as an angle between a major diameter of the integrator and an optical axis, wherein a peripheral edge shape of the second reflector is determined based on the following formulas: where: f f D represents a distance from a light emission center of the lamp to the collimator lens; P Z β represents an angle between the light ray reflected at the designated at point and the optical axis; M(φ) represents an effective diameter of the integrator; and θ represents a polar angle proportional to the effective diameter M(φ)of the integrator.