| 摘要 |
A focus detecting device includes a photographic lens, a condenser lens disposed adjacent to a preset imaging plane of the photographic lens, an aperture stop having a pair of apertures arranged with sufficient space for ensuring focus accuracy, a reimaging lens having a pair of lens elements arranged to correspond to individual apertures, and a photoelectric converter. Two light beams passing through different areas of the photographic lens are received by the photoelectric converter and the phase difference between the two light beams is detected from the intensity distribution of light on the light-receiving surface of the photoelectric converter so that a focusing state of the photographic lens can be recognized. Further, the focus detecting device satisfies the condition:0.67</=h2/ delta </=0.87where h2 is the distance from the optical axis of the condenser lens to the centroidal position of an aperture of the aperture stop and delta is the distance from the optical axis of the condenser lens to the optical axis of the reimaging lens.
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