Patent ID: 9086541
Filing Date: 2015-07-21
Classification: G02B,G03B

Abstract:
1. An optical instrument having first and second lens groups capable of moving in an optical axis direction in order to perform optical zooming, comprising: a first drive section for moving the first lens group using a first actuator; a second drive section for moving the second lens group using a second actuator that is different from the first actuator of the first drive section; a storage section for storing information on the position of the first lens group and position of the second lens group in accordance with a specified focal length of the optical instrument, and storing information relating to movement speed of the first lens group and movement speed of the second lens group in accordance with specified focal length; a first lens group position detection section for detecting position of the first lens group; and a control section for calculating a first synchronous speed of the first lens group and a second synchronous speed of the second lens group, which are respective movement speeds for synchronizing the movement speed of the first lens group and movement speed of the second lens group, based on position of the first lens group, and movement speed of the first lens group and movement speed of the second lens group that have been stored in the storage section, calculating a first target position for the first lens group and a second target position for the second lens group based on position of the first lens group and information relating to position information of the first lens group and position information on the second lens group that has been stored in the storage section, and controlling the first drive section and the second drive section so as to respectively move the first lens group to the first target position at the first synchronous speed, and move the second lens group to the second target position at the second synchronous speed.