Patent ID: 8526805
Filing Date: 2013-09-03
Classification: G02B,G03B

Abstract:
1. A lens apparatus, comprising: a zoom lens; a focus lens; a zoom driving unit for driving the zoom lens; a zoom position detector for detecting a position of the zoom lens; a focus position detector for detecting a position of the focus lens; a zoom position control signal generator for generating a zoom position control signal indicating a position of the zoom lens; a focus position control signal generator for generating a focus position control signal indicating a position of the focus lens; a first angle-of-field calculation unit for calculating a first angle of field as a present angle of field based on the position of the zoom lens from the zoom position detector and the position of the focus lens from the focus position detector; a second angle-of-field calculation unit for calculating a second angle of field based on the position of the zoom lens indicated by the zoom position control signal and the position of the focus lens from the focus position detector; a third angle-of-field calculation unit for calculating a third angle of field based on the position of the zoom lens indicated by the zoom position control signal and the position of the focus lens indicated by the focus position control signal, which are used when the second angle-of-field calculation unit calculates; a base angle-of-field determination unit for determining a sum of the first angle of field and a value obtained by subtracting the third angle of field from the second angle of field, as a base angle of field; and a zoom position control determination unit for determining the position of the zoom lens to a position of the zoom lens corresponding to the base angle of field, wherein the zoom driving unit drives the zoom lens to the position of the zoom lens determined by the zoom position control determination unit.