Title:
ZOOM LENS DEVICE
Document Type and Number:
Japanese Patent JPH055820
Kind Code:
A
Abstract:
PURPOSE:To obtain a zoom lens device where the intention of variable power and the intention of focusing of a photographer are introduced as a signal in an arithmetic control part, the positions of a lens group for the variable power and a lens group for correcting a focusing position and focusing are actively controlled from the arithmetic control part, out-of-focus caused by the quick change of a detected value is prevented, a driving part is miniaturized, and high reliability and low cost are accomplished. CONSTITUTION:This zoom lens is provided with a variable power lens group 2, a lens group 4 for correcting the out-of-focus and focusing, and a means for driving and positioning the respective lens groups, and an arithmetic control part 24 for controlling the respective driving means is provided with a memory 25 which incorporates the position table of each lens group and where the position of each lens group is stored, and the position of the lens is controlled by comparing the position table with the memory according to the signal of instructing means 20-22 for instructing the variable power, etc., to the arithmetic control means 24.
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Inventors:
SAKANO MAKOTO
Application Number:
JP12278191A
Publication Date:
January 14, 1993
Filing Date:
April 26, 1991
Export Citation:
Assignee:
KONISHIROKU PHOTO IND
International Classes:
G02B7/08; G02B7/10; G03B5/00; (IPC1-7): G02B7/08; G02B7/10; G03B5/00
Attorney, Agent or Firm:
Fumio Sato (2 others)
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