| 摘要 |
PURPOSE:To perform point image position detection and focus detection simultaneously with one photodetector by separating the output of the photodetector to a point image position signal and a focus signal by a separator. CONSTITUTION:When the center of an aperture for detecting the optical image position detecting aperture of a rotary plate 22 coincides with an optical axis 21a by rotation of this plate 22, an optical image is projected onto a photodetector 24, and positions of the point image in two directions orthogonal to each other are detected by the photodetector 24, and the point image position signal is outputted to an amplifier 25. When the center of the detecting slit of the rotary plate 22 coincides with the optical axis 21a by rotation of this plate 22, the focus signal is outputted to the amplifier 25. These signals are separated from each other by a separator 26, and individual signals are supplied to a point image position display device 27 and a focus display device 28 respectively. |
