| 摘要 |
An optical system for producing a three-dimensional real image of an object. The apparatus includes at least one concave reflective surface and a second reflective surface. In a first aspect of the invention the system includes two concave reflective surfaces in substantially fixed spatial relationship to each other. The surfaces share a common vertex. Furthermore, the tangential lines at the vertices of the reflective surfaces form an angle in the range of 90° to 180°. In a second aspect of the system one of the concave reflective surfaces is replaced by a planar reflective surface. By replacing a concave reflective surface with the planar reflective surface a three-dimensional real image can be created while achieving greater economy of production.
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