Lens apparatus

摘要

A lens apparatus includes zoom and focus units, zoom, and focus position detectors, a focus driver, an in-focus distance unit, used to input a command, a memory storing a table representing a focus position associated with the zoom position and the in-focus distance, and a controller controlling the focus driver based on the command and performing periodically first operation of determining a zoom number based on the zoom position, second operation of determining an in-focus-distance number based on the command, third operation of calculating a provisional target for the command based on data extracted from the table with reference to the zoom and in-focus-distance numbers, fourth operation of calculating a target associated with the zoom position from the provisional target, fifth operation of driving the focus unit to the target. Between the first and fifth operations, the fourth operation is performed but the second and third operations are not.

主权项

1. A lens apparatus comprising:
a zoom unit that changes a focal length; a zoom position detector that detects a zoom position, the zoom position being the position of the zoom unit; a focus unit that changes an in-focus distance; a focus position detector that detects a focus position, the focus position being the position of the focus unit; a focus driver that drives the focus unit; a focus operation unit configured to direct an in-focus distance; a memory unit in which a relationship between the zoom position and a position of the focus unit associated with the in-focus distance is stored; a focus controller that controls the focus driver, wherein the focus controller performs the following operations respectively: a first operation of deriving a plurality of provisional focus target positions based on a zoom position detected by the zoom position detector, an in-focus distance directed by the focus operation unit and the relationship stored in the memory unit; and a second operation of deriving a focus target position by interpolation calculation based on the plurality of provisional focus target positions that are derived, wherein a frequency of the first operation is less than a frequency of the second operation.