Lens driver

Abstract

Abstract PURPOSE:To reduce the load on a power source and to eliminate the dynamical mutual interference of a lens group by outputting the position where the lens group ought to be positioned, driving and controlling each lens group while detecting the position of the lens group. CONSTITUTION:A power focusing mode is entered with the button of a focusing operation input part 601 pressed. The initial position of a 2nd group lens 72 is read in. The direction and distance of movement of the lens 72 are outputted. The movement distance is a prescribed quantity delta in slow-speed mode to make image variation due to lens group movement small by single-time driving and 3delta in high-speed mode. This value is added to the read position of the lens 72 to output the target position. The position of a 3rd group lens 73 corresponding to the target position of the lens 72 is calculated. A photo-MOS relay is turned on to output a driving signal by a driving circuit 54 under the control of a control part 57, and the lens 72 is driven; and its position is read out and when the lens 72 reaches the target position, the driving signal is ceased. A 3rd lens group 73 is also driven similarly.

Inventors

• 👤 Mitsumasa Okubo
• 👤 光將 大久保
• 👤 Yasushi Toizumi
• 👤 戸泉　安司
• 👤 Toyoji Sasaki
• 👤 佐々木　豊治
• 👤 Takeshi Musashi
• 👤 剛 八道
• 👤 Shigeru Kato
• 👤 茂 加藤

Bibliographic Details