CONTINUOUSLY VARIABLE FOCAL DISTANCE LENS,申请号JP19830017633-传众专利搜索

CONTINUOUSLY VARIABLE FOCAL DISTANCE LENS

申请公布号：JPS59143111(A)

申请号：JP19830017633

申请日期：1983.02.04

申请公布日期：1984.08.16

申请人：

MATSUSHITA DENKI SANGYO KK

发明人：KUNO TAKASHI;KAWADA KOUICHI

分类号：G02B7/08;G02B7/04;(IPC1-7):G02B7/04

主分类号：G02B7/08

摘要：PURPOSE:To facilitate the production of a focal point shift mechanism as well as the correction of a lens error and the change of design respectively, by shifting plural lens systems with the electrical power and controlling the shift position of the lens system with the signal read out of a memory element. CONSTITUTION:An address corresponding to a desired focal distance is designated to a command terminal 23 from outside, and an ROM15 delivers the corresponding memory information. This output information is compared with the value corresponding to the position of a slider 13 of a potentiometer 14 through a comparator 16. This difference signal drives a motor 12, and a variator lens 2 is shifted to set the difference signal at 0. The signal of the terminal 23 is also applied to an ROM21, and this output information is compared in the same way with the value of a potentiometer 20 through a comparator 22. This difference output makes a compensator 3 move via a linear motor 18. The correction of errors of lenses 2 and 3, the change of design, etc. are performed easily by correcting the memory contents of the ROM15. Furthermore a complicated cam mechanism is excluded.