Patent ID: 7699473
Filing Date: 2010-04-20
Classification: G02B,H04N

Abstract:
1. An image display apparatus comprising an image display device for demonstrating an image; a relaying optical system for relaying image light of said image demonstrated on said image display device; a prism at least including a first planar optical surface, a second planar optical surface arranged substantially parallel to said first planar optical surface on a side towards an optical pupil, an incident planar optical surface which has an optical axis including an angle of not less than 30 degrees and less than 90 degrees with a normal to said first planar optical surface or to the second planar optical surface and on which is incident said image light relayed by said relaying optical system, and a reflective transmitting surface having a preset tilt relative to said first planar optical surface or said second planar optical surface and adapted for reflecting or transmitting said image light incident thereon from said incident optical surface; a reflective optical component arranged on a side towards said first planar optical surface of said prism and configured for reflecting said image light reflected on said reflective transmitting surface and radiated from said first planar optical surface towards said reflective transmitting surface as a substantially collimated light beam; and a phase difference optical component arranged on a light path of said first planar optical surface of said prism and said reflective optical component, sandwiching an air layer between the phase difference optical component and said first planar optical surface or said reflective optical component, said phase difference optical component transforming the state of polarization of said image light; said prism guiding said image light, incident on and proceeding into said prism from said incident optical surface, up to said reflective transmitting surface, as said image light undergoes internal total reflection on said first planar optical surface and on said second planar optical surface, an intermediate image of said image being formed in the course of the guiding of said image light.