JP2006301150A5 - - Google Patents

Claims (7)

A phase difference type focus detection means for detecting a light flux from a subject and obtaining a focus adjustment state of the photographing optical system;
Imaging means for capturing an image of a subject light flux that has passed through the imaging optical system;
Contrast detection means for obtaining contrast information based on an image captured by the imaging means;
In an autofocus apparatus comprising: a focus adjustment unit that controls focus adjustment of the photographing optical system based on the focus adjustment state according to the contrast information ;
When the focus adjustment state cannot be detected, the focus adjustment unit determines whether to perform an operation of detecting the focus adjustment state while moving the focus adjustment lens of the photographing optical system according to the contrast information. Autofocus device characterized by. The autofocus device according to claim 1,
  If it is determined that the focus adjustment unit does not perform an operation of detecting the focus adjustment state while moving the focus adjustment lens, it is determined whether or not the contrast value detected by the contrast detection unit during the focus adjustment has decreased. Determination means to perform,
  The autofocus apparatus, wherein the focus adjustment unit determines whether to stop the focus adjustment based on a determination result of the determination unit. In the autofocus device according to claim 2,
  The autofocus apparatus, wherein the focus adjustment unit stops the focus adjustment when it is determined by the determination unit that a contrast value is lowered during the focus adjustment. In the autofocus device according to claim 2,
  The focus adjustment unit continues the focus adjustment when the determination unit determines that the contrast value does not decrease during the focus adjustment. A phase difference type focus detection means for detecting a light flux from a subject and obtaining a focus adjustment state of the photographing optical system;
  Imaging means for capturing an image of a subject light flux that has passed through the imaging optical system;
  Contrast detection means for obtaining contrast information based on an image captured by the imaging means;
  In an autofocus device including a focus adjustment unit that controls focus adjustment of the photographing optical system based on the focus adjustment state and the contrast information,
  The autofocus apparatus, wherein the focus adjustment unit performs the focus adjustment according to the contrast information when the subject has a periodic pattern. In the autofocus device according to any one of claims 1 to 5 ,
An autofocus device characterized in that an area picked up by the image pickup means is wider than a focus area in which the focus detection means detects a focus adjustment state and includes the focus area. A phase difference type focus detection means for detecting a light flux from a subject and obtaining a focus adjustment state of the photographing optical system;
Imaging means for capturing an image of a subject light flux that has passed through the imaging optical system;
Contrast detection means for obtaining contrast information based on an image captured by the imaging means;
Focus adjusting means for adjusting the focus of the photographing optical system in accordance with the focus adjustment state and the contrast information;
An autofocus apparatus comprising: a timing control unit that matches a detection time of the light flux by the focus detection unit with a central time of an imaging time by the imaging unit.