Tracking controllable image pickup apparatus

摘要

The image pickup apparatus includes a memory storing first tracking data indicating a positional relationship of a magnification-varying lens and a correction lens and second tracking data indicating a positional relationship of the magnification-varying lens and an image sensor. A controller moves the correction lens and the image sensor using the first and second tracking data. An in-focus position detector detects an in-focus position using an output from the image sensor. A tracking adjuster obtains an adjustment value for adjusting the first tracking data, by using a difference between the detected in-focus position in a state where the magnification-varying lens is located at a first zoom position and the image sensor is located at a position in the second tracking data corresponding to the first zoom position and a position of the correction lens in the first tracking data corresponding to the first zoom position.

主权项

1. An image pickup apparatus comprising:
a magnification-varying lens unit that is moved in an optical axis direction to perform variation of magnification; a correction lens unit that is moved in the optical axis direction during the variation of magnification to correct image plane variation caused due to the variation of magnification; an image sensor that photoelectrically converts an optical image formed by light passing through the magnification-varying lens unit and the correction lens unit, and is moved in the optical axis direction during the variation of magnification; a memory that stores first tracking data indicating a positional relationship of the magnification-varying lens unit and the correction lens unit, and stores second tracking data indicating a positional relationship of the magnification-varying lens unit and the image sensor; a controller that is configured to move the correction lens unit and the image sensor by using the first tracking data and the second tracking data, with the movement of the magnification-varying lens unit; an in-focus position detector that is configured to detect an in-focus position of the correction lens unit by using an output from the image sensor; and a tracking adjuster that is configured to obtain an adjustment value to be used for adjusting the first tracking data, by using a difference between (a) the in-focus position detected through the in-focus position detector in a state where the magnification-varying lens unit is located at a first zoom position and the image sensor is located at a position in the second tracking data corresponding to the first zoom position and (b) a position of the correction lens unit in the first tracking data corresponding to the first zoom position, wherein, when the first tracking data include a middle position at which an amount of a change of a position of the correction lens unit with respect to a change of a position of the magnification-varying lens unit is zero, the tracking data adjuster obtains the adjustment value at a wide-angle end, a telephoto end and the middle position.