Patent ID: 8611739
Filing Date: 2013-12-17
Classification: G02B,G03B

Abstract:
1. A focus adjusting apparatus comprising: an optical system including a focus lens; a driver configured to move the focus lens along an optical axis of the optical system; an obtaining unit configured to periodically obtain an evaluation value of a subject image formed via the focus lens; a determining unit configured to determine a target position to which the focus lens is moved based on the evaluation value; and a controller configured to control an operation of the driver based on the determined target position, wherein during a moving image recording in which sound is recorded as well as an moving image, the controller controls the driver to move the focus lens at a first speed for a first period including a backlash period which is defined from start of the operation of the driver to start of an actual movement of the focus lens, and controls the driver to move the focus lens at a second speed faster than the first speed for a second period after the end of the first period; and wherein the first speed is a predetermined speed for minimizing or eliminating a contact sound of the driver and the focus lens during the backlash period, or for minimizing or eliminating a driving sound of the driver during the backlash period.