Patent ID: 6453123
Filing Date: 2002-09-17
Classification: G02B

Abstract:
A control system of zoom lens for digital still cameras which controls zooming of the zoom lens using programmed data written in the micro controller unit (MCU) of digital still cameras and at the same time controls auto-focusing of the zoom lens with the very mechanism which is used for the zoom controlling by receiving electronic signals (pulses) from the MCU or electronically controlled distance measuring system of the digital still camera comprising:(a) an assembly base on which said control system of zoom lens for digital still cameras is assembled; (b) a front (first) group of lenses, which is assembled in a lens barrel and placed at the headmost position of said zoom lens assembly; (c) a group of lenses as the second group of lenses, which is assembled in a lens barrel as the second barrel and placed next to said first group of lenses; (d) a threaded bearing as the first threaded bearing which is formed as a part of said second lens barrel of said second group of lenses; (e) a means of position stabilizing as the first means of position stabilizing for said second lens barrel not to rotate; (f) a stepping motor as the first stepping motor to drive said second lens barrel; (g) a screw rod as the first screw rod which is provided on and connected to the shaft of said first stepping motor as an extension of the motor shaft and is screwed into the bearing hole of said first threaded bearing of said second lens barrel of said second group of lenses and engaged with the threads provided on the inner wall of said first threaded bearing of said second lens barrel of said second group of lenses; (h) a group of lenses as the third group of lenses, which is assembled in a lens barrel as the third lens, barrel and placed next to said second group of lenses; (i) a threaded bearing as the second threaded bearing which is formed as a part of said third lens barrel of said third group of lenses; (j) means of position stabilizing as the second means of position stabilizing for said third lens barrel not to rotate; (k) a stepping motor as the second stepping motor to drive said third lens barrel; and (l) a screw rod as the second screw rod which is provided on and connected to the shaft of said second stepping motor as an extension of the motor shaft and is screwed into the bearing hole of said second threaded bearing of said third lens barrel of said third group of lenses and engaged with the threads provided on the inner wall of said second threaded bearing of said third lens barrel of said third group of lenses.