| 摘要 |
PURPOSE:To adjust a focus by an AF even in a freely extensible-contractible close-up photographing device. CONSTITUTION:In a close-up photography device which is installed between an AF camera body 201 and an AF lens barrel 202 and has distance changing parts 2 and 3 to change a distance between the AF lens barrel 202 and an image surface, it has a driving pulley to rotate by obtaining driving force from the AF camera body 201, a driven pulley to output driving force of the driving pulley to the AF lens barrel 202, a timing belt to transmit the driving force of the driving pulley to the driven pulley and an idler pulley to move between the driving pulley and the driven pulley so as to apply always optimal tensile force to the timing belt according to a change in the distance between the AF lens barrel 202 and the image surface by the distance changing parts. |
