Patent ID: 7891825
Filing Date: 2011-02-22
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; 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; wherein, when a light emission center of the lamp is an origin, an optical axis direction in which the integrator is present from the origin is a z-axis, an arbitrary axis passing through the origin and running perpendicularly to the z-axis is a y-axis, an axis passing through the origin and running perpendicularly to a y-z plane is an x-axis, a polar angle from the z-axis to an arbitrary point of the outermost outline of the second reflector is θ, an azimuth angle from the x-axis to an arbitrary point of the outermost outline of the second reflector from the x-axis an x-y plane is φ, and a maximum value and a minimum value of the polar angle θ are θ 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 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.