Patent ID: 7027229
Filing Date: 2006-04-11
Classification: G02B

Abstract:
1. A display optical system comprising: a light source; a reflective image forming element which receives illumination light from the light source and provides display light; and an optical system which guides display light from the image forming element to an eye of an observer, wherein the optical system includes a first optical system and a second optical system, the first optical system including a first surface which has at least a reflective action and is decentered with respect to a central principal ray, and a second surface which reflects the central principal ray light reflected on the first surface again toward the first surface, the first surface reflects the central principal ray which is again incident on the first surface from the second surface substantially toward an opposite side to the previous reflection with respect to a normal on a hit point of the central principal ray on the first surface, at least one surface of the second optical system has a curve surface shape which is decentered with respect to the central principal ray, the first optical system directs the display light to the eye of the observer, the second optical system directs the illumination light to the image forming element and directs the display light to the first optical system, and at least one surface of the second optical system transmits one of the illumination light and the display light, and reflects the other.