Focus adjustment unit and camera system

摘要

A focus adjustment unit of the present invention comprises a lens drive section for driving the focusing lens, an image sensor for acquiring imaged data for a subject image, a control section for executing imaging operations using the image sensor by causing movement of the focusing lens, and carrying out scan operations for detecting position of the focusing lens at which a peak of image contrast occurs, a continuous shooting speed setting section for setting a speed for continuously executing exposure operations for shooting, and a limit time setting section for setting an effective limit time effective for carrying out the scan operation in accordance with a continuous shooting speed that has been set by the continuous shooting speed setting section, wherein the control section controls the scan operation so that the time that has been set up by the limit time setting section is not exceeded.

主权项

1. A focus adjustment unit, for carrying out focus adjustment of a photographing optical system that concentrates light from a subject, including a focusing lens capable of movement in the optical axis direction, comprising:
a lens drive section for driving the focusing lens; an image sensor for acquiring imaged data for a subject image that has been concentrated by the photographing optical system; a control section for executing imaging operations using the image sensor by causing movement of the focusing lens, and carrying out a scan operation for detecting position of the focusing lens at which a peak of image contrast occurs, based on a plurality of items of imaged data output by the image sensor, a continuous shooting speed setting section for setting a speed for continuously executing exposure operations for shooting using the image sensor; and a limit time setting section for setting an effective limit time for carrying out the scan operation in accordance with a continuous shooting speed that has been set by the continuous shooting speed setting section, wherein the control section controls the scan operation so that the time that has been set up by the limit time setting section is not exceeded, wherein the limit time setting section sets the limit time to a time that is before the time when exposure for shooting of the image sensor commences, by a movement time for achieving focus by moving the focusing lens to a focusing lens position where contrast detected by the scan operation becomes a peak, and wherein the limit time setting section sets the movement time based on a frame frequency of the image sensor can be handled by the lens drive section.