Title:
LENS DEVICE AND PHOTOGRAPHING DEVICE
Document Type and Number:
Japanese Patent JP2014186095
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a lens device that uses a photographing plane phase difference sensor capable of an autofocus adjustment even when a defocus is large without affecting a picture signal upon the autofocus adjustment in photographing a video.SOLUTION: A lens device has: a focus lens group that moves for a focus adjustment; drive means that drives the focus lens group; a photographing plane phase difference sensor that receives subject light from the focus lens group to generate a picture signal and a phase difference signal, and is used for a focus detection; a first diaphragm that stops down, out of the subject light, both of a flux of light for photographing and a flux of light for the focus detection; a second diaphragm that stops down the flux of light for the focus detection out of the subject light; and control means that performs the focus detection on the basis of the phase difference signal or the picture signal obtained by the photographing plane phase difference sensor, and controls the drive means to drive the focus lens group to a focus position.
Inventors:
KIKUCHI SHOHEI
Application Number:
JP2013059699A
Publication Date:
October 02, 2014
Filing Date:
March 22, 2013
Export Citation:
Assignee:
CANON KK
International Classes:
G02B7/28; G02B7/34; G02B7/36; G03B9/02; G03B13/36; H04N5/232
Attorney, Agent or Firm:
Okabe 讓
Shin-ichi Usui
Takao Ochi
Seiichiro Takahashi
Hiroshi Yoshizawa
Masami Saito
Katsuhiko Kimura
Takafumi Tanaka
Shin-ichi Usui
Takao Ochi
Seiichiro Takahashi
Hiroshi Yoshizawa
Masami Saito
Katsuhiko Kimura
Takafumi Tanaka