| 摘要 |
An imaging unit includes an incident-side optical system; an incident-side prism including a first incident surface which is orthogonal to the optical axis of the incident-side optical system, a first reflecting surface and a first exit surface; an exit-side prism including a second incident surface, a second reflecting surface and a second exit surface which is orthogonal to the optical axis and from which light rays reflected by the second reflecting surface emerge; and an image sensor which receives light rays that emerge from the second exit surface. The first incident surface is positioned closer to the photographic object than the second exit surface. A deflection angle of parallel light rays, on the optical axis, at the first reflecting surface is greater than 90°, and a deflection angle of the parallel light rays at the second reflecting surface is smaller than 90°.
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