Patent ID: 8068286
Filing Date: 2011-11-29
Classification: G02B,G03B,H04N

Abstract:
1. A variable focal lens, comprising: a zoom ring; a focusing ring; a stepper motor for moving the focusing ring to a FAR side and a NEAR side; and a focus adjustment section for controlling the stepper motor to move the focusing ring for a focus adjustment, and wherein the focus adjustment section causes the focusing ring to move by a first moving distance in a first moving direction toward one of the FAR side and the NEAR side, and then to move the focusing ring by a second moving distance which is larger than the first moving distance and equal to or less than a focusing ring movement range in a second moving direction opposite to the first moving direction, and set the end point where the focusing ring reaches after the movement in the second moving direction as a reference point for adjustment by resetting an up/down counter, and the focus adjustment section causes the focusing ring to move from the reference point for adjustment in the first moving direction within a range equal to or less than the second moving distance to carry out the focus adjustment.