CALIBRATION METHOD FOR FOCAL DISTANCE VARIABLE LENS AND FOCAL DISTANCE VARIABLE LENS DEVICE

摘要

To provide a calibration method for a focal distance variable lens and a focal distance variable lens device which can obtain desired refractive power by adjusting a driving signal.SOLUTION: A calibration method for a focal distance variable lens including a liquid lens unit 3 of which focal distance periodically changes by a periodic driving signal uses a calibration tool 91 having a large number of parts with different heights on a surface, outputs a driving signal Cf of a predetermined voltage to the focal distance variable lens, detects a surface image of the calibration tool 91 in an image detection section 4, detects two positions where contrast is maximum in the surface image, calculates a focal depth from a difference in focal distance between the two positions, creates a calibration table 712 by repeating operation of associating the focal depth with the voltage of the driving signal Cf and storing them, and reads the value of the voltage corresponding to the desired focal depth from the calibration table 712 and adjusts the voltage of the driving signal Cf to output to the focal distance variable lens on the basis of the read value when setting the focal distance variable lens to the desired focal depth.SELECTED DRAWING: Figure 5