| 摘要 |
PURPOSE:To make constitution highly accurate and simple by the constitution consisting in providing the rangefinding element of at least one optical path on a turning member pivoted on the outer side of range sandwiched by the main axes of both optical paths and turning this turning member cooperatively with the focus controlling mechanism. CONSTITUTION:A lever 3 holding a light emitting light source 2 is pivotally fitted turnably to the shaft 4 provided in the position apart by a distance (c) on the opposite side of an optical axis 71 from the optical axis 70 of a projecting lens 5, and is moved cooperatively with a focus controlling device by way of an operating lever 15. In case when a subject is in the position A of a remote distance, the light source 2 turns and the projecting optical path intersects on a photodetecting optical path 71 and the subject A, thence the reflected light from the subject images on a photodetector 7 past the lens 6, whereby focusing detection is accomplished. In case when the subject is in a near distance position B, the light source 2 turns and when both optical paths intersect on the subject B, the focusing detection is accomplished. In this case, the image of the light source 2 is so formed that the subject and the light source 2 are always in conjugate positions irrespective of distances. |
