| 摘要 |
PURPOSE:To effectively prevent the lowering of a high frequency component at the time of obtaining a focusing signal of a photographic lens by making a good use of wobbling, and to obtain the focusing signal of high accuracy by installing a driving means for shifting a member installed on a light exit surface in an optical axis direction. CONSTITUTION:A luminous flux of a red wavelength band among a luminous flux made incident on a red resolving prism 202 is made incident on a red image pickup element 3R after being reflected by a red dichroic vapor-deposited surface 215 and totally reflected by a reflection surface 214a which is on the same plane of the light incident surface 214 of the red prism 202. On the other hand, a green component luminous flux transmitted through the red dichroic vapor-deposited surface 215 is made incident on a prism 203, and then, it branches into two luminous fluxes; reflected light and transmitted light at a half mirror surface (light splitting surface) 217. The light reflected by the half mirror surface 217 is emitted from a light exit surface 218 equipped with a wobbling mechanism 5 of the prism 203, and then, it is made incident on the image pickup element 4. And an object image of green light is formed on the surface of the image pickup element 4, and the focusing signal with reference to the photographic lens 1 is obtained from the image pickup element 4 by vibrating the image pickup element 4 by the wobbling mechanism 5 in the optical axis direction. |
