Title:
FOCUSING LENS DEVICE
Document Type and Number:
Japanese Patent JP2010072333
Kind Code:
A
Abstract:
To achieve high-accuracy focus adjustment on a specific one of a plurality of subjects desired by a photographer when there are a plurality of subjects in a range for determining an in-focus state.
The focusing lens device includes a focus lens group 1, a variable power lens group 2, a focusing state detection means 5 and an arithmetic operation means 8 for the components, and stops focus adjusting operation when at least either the focus lens group 1 or the variable power lens group 2 moves in a direction where depth of focus is deeper.
Inventors:
SAKAMOTO MASAYUKI
Application Number:
JP2008239566A
Publication Date:
April 02, 2010
Filing Date:
September 18, 2008
Export Citation:
Assignee:
CANON KK
International Classes:
G02B7/28; G03B13/36; H04N5/225; H04N5/232
Domestic Patent References:
JPH04361482A | 1992-12-15 | |||
JPS6053910A | 1985-03-28 | |||
JPH01284184A | 1989-11-15 | |||
JPH05257192A | 1993-10-08 | |||
JPH06153053A | 1994-05-31 |
Attorney, Agent or Firm:
Yasuhiko Hibiya