| 摘要 |
PURPOSE: To suppress fluctuations in the aberration of curvature of image face even in a constitution with reduced lens groups by providing a deforming means deforming an image recording medium and a control means actuating the deforming means so as to compensate the aberration of the curvature of image face caused by a change in a focal distance. CONSTITUTION: Film pressing members 301 and 302 are the deforming means deforming a film along the curvature of a pressure plate. An engaging projection 301b engaged with the cam part 101b of a driving ring as the control means are formed on the pressing members 301 and 302. The pressing members 301 and 302 are constituted so that they are kept in a retreated state not to interfere with the film, when lens performance is in a normal aberration standard and enter into the surface of the film to curve it along the curvature of the pressure plate, when the lens performance is in a region where the aberration of the curvature of field is out of a standard, in the vicinity of the middle. |
