US Patent No. 9,160,919

FOCUS ADJUSTMENT UNIT AND CAMERA SYSTEM


Patent No. 9,160,919
Issue Date October 13, 2015
Title Focus Adjustment Unit And Camera System
Inventorship Satoru Ito, Komae (JP)
Assignee Olympus Corporation, Tokyo (JP)

Claim of US Patent No. 9,160,919

1. A focus adjustment unit having an imaging section configured to generate an image signal by forming and capturing an optical
image on an image sensor by an optical system including a focusing lens, for performing focus adjustment based on a focus
detection signal relating to a focus detection area set within an imaging area, the focus adjustment unit comprising:
a focusing lens position detection section configured to detect a position of the focusing lens;
a storage section configured to store information on an image magnification change of the optical system along with the movement
of the focusing lens; and

a focus detection area setting section configured to set a focus detection area within the imaging area, wherein
the focus detection area setting section sets the focus detection area based on the position of the focusing lens and the
information on an image magnification change, and

the focus detection area setting section calculates an image height of the focus detection area, after the focusing lens is
moved, based on the image magnification change in accordance with a change of the position of the focusing lens and an image
height of the focus detection area before the focusing lens is moved, and sets the focus detection area based on the calculated
image height.