Image projection arrangement
DCFirst Claim
1. An image projection arrangement comprising a light source for producing a first light beam, a reflective image display system arranged in the path of the first light beam and having at least one image display panel for generating an image to be projected, a projection lens system arranged in the path of a second light beam originating from the image display system for projecting the image produced by the image display system onto a projection screen, characterized in that between the light source and the image display system on the one hand and between this system and the projection lens system on the other hand a transition from a first to a second medium is provided, these media having different refractive indices, the transition being arranged such that one of the first and second light beams is totally reflected by the transition whilst the other light beam is transmitted by the transition.
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Abstract
An image projection arrangement is described which comprises a light source (1) for producing a first light beam (b1), a reflective image display system (10) provided in the path of this light beam and a projection lens system (20), arranged in the path of a second light beam (b2) originating from the image display system. A beam-separating element (5) whose operating principle is based on total internal reflection of one of the beams (b1, b2) is provided in the light path between the light source and the image display system on the one hand and said system and the projection lens system on the other hand. This sresults in an adequate separation of these beams while the dimensions of the arrangement remain limited.
137 Citations
8 Claims
- 1. An image projection arrangement comprising a light source for producing a first light beam, a reflective image display system arranged in the path of the first light beam and having at least one image display panel for generating an image to be projected, a projection lens system arranged in the path of a second light beam originating from the image display system for projecting the image produced by the image display system onto a projection screen, characterized in that between the light source and the image display system on the one hand and between this system and the projection lens system on the other hand a transition from a first to a second medium is provided, these media having different refractive indices, the transition being arranged such that one of the first and second light beams is totally reflected by the transition whilst the other light beam is transmitted by the transition.
Specification