| 摘要 |
An optical system including a symmetrical beamsplitter comprised of a semi-transparent film of light reflective material sandwiched between two optical plates of transparent materials having respective thicknesses and indices of refraction suitable for providing equivalent optical paths on either side of the film. The beamsplitter may be positioned in optical alignment with an image source and oriented to have one of its surfaces at an angle to said source. Thus, a light ray emanating from the source will have a fractional component transmitted through the film along one optical path and a fractional component will be reflected from the film along an equivalent optical path disposed at an angle to said one optical path. Also, the beamsplitter may be located symmetrically between two image sources such that the light rays emanating from one source and reflected by the beamsplitter together with corresponding light rays emanating from the other source and transmitted by the beamsplitter combine and travel common paths from the beamsplitter film. As a result, an observer's eye or any similar focusing system may be positioned over a relatively large range of viewing angles to receive said combined light rays and produce a composite image.
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