| 摘要 |
PURPOSE:To improve the optical performance of the secondary object image of a photodetecting element array and to improve the accuracy of focus detection by splitting the two secondary object images vertically by using the 1st and the 2nd reflecting parts which have a reflecting surface in a specific shape for an image re-formation system CONSTITUTION:Two reflecting surfaces 6-122 and 6-222 of the 2nd reflection part which have different tilt angles are arranged divisionally in the image re-formation system 6 at right angles to the division direction of the two reflecting surfaces 6-121 and 6-222 of the 1st reflection part which have different tilt angles. Consequently, luminous flux passed through one of two image reforming lenses 6-11 and 6-21, e.g. 6-11 is reflected by the reflecting surface 6-121 of the 1st reflection part and then reflected only by the reflecting surface 6-122 of the 2nd reflection part to strike on the other reflecting surface 6-222, and the luminous flux is prevented from being mixed to improve the optical performance of the secondary object image on a photodetecting means 8. Consequently, high-accuracy focus detection is performed all the time. |
