| 摘要 |
A decentering optical system which takes a substantially parallel beam as input light, including a prism whose refractive index is greater than 1, and in which: at the boundary surface of the prism, at least five optical surfaces, which are arranged so as to be mutually decentering or inclined, are formed, in order along one optical path which the input light pursues, as a first surface, a second surface, a third surface, a fourth surface, and a fifth surface; at least two among these five optical surfaces are rotationally asymmetric surfaces; and, upon an optical path along which the input light proceeds in order from the first surface to the fifth surface and is emitted to the exterior of the prism, along with at least one real image being formed interior of the prism, an exit pupil is formed at the exterior of the prism.
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