Patent ID: 8649674

Claim:
A lens driver of two-phase pulse system, comprising: a driver configured to drive a lens; a manually operated ring provided on a lens barrel and configured to be manually rotated relative to the lens barrel; a rotation detector configured to detect a rotation direction and a rotating speed of the manually operated ring on the basis of a rotation of the manually operated ring; a switcher configured to switch a control mode, on the basis of a detection result of the rotation detector, between a normal control mode in which the lens is driven at a normal driving speed depending on the rotating speed of the manually operated ring and a high-speed control mode in which the lens is driven at a high driving speed which is faster than the normal driving speed in the normal control mode, an autofocus macro button which, upon being pressed, automatically activates a focusing function for a macro photographing, being used as the switcher, the control mode being in the high-speed control mode when the switcher is activated, and the control mode being in the normal control mode when the switcher is deactivated; and a driving controller configured to control the driver so that the lens is driven at the normal driving speed when the normal control mode is set and to control the driver so that the lens is driven at the high driving speed when the high-speed control mode is set, wherein the rotation detector generates count pulses according to the rotation of the manually operated ring, and the driving controller determines a start of the rotation of the manually operated ring on the basis of a rising of the count pulses, sets a number of pulses of driving pulses which drive the driver depending on a cycle of the count pulses and in synchronization with the count pulses in the normal control mode, continuously drives the driver at a fixed high speed in the high-speed control mode regardless of a change in a cycle of the count pulses for a predetermined period of time after a rising or a falling of the count pulses of the manually operated ring is detected, and stops the continuous high-speed driving of the driver after the predetermined period of time passes.