Patent ID: 8373793

Claim:
An auto focusing method using a VCM actuator, the method of using the VCM actuator to upwardly move a lens position, to obtain a most-focused upward position value, and downwardly move the lens position to automatically adjust the lens focus, the method comprising: obtaining an auto focus (AF) upward position value, which is an upward position value of a lens when the lens is most focused by upwardly moving the lens to capture an image; determining whether a difference between the AF upward position value and an AF downward position value of a code value which is a bit value corresponding to the AF upward position value is smaller than a pre-set level; and implementing the auto focusing the code value if the difference is smaller than the pre-set level, and using a hysteresis table of the VCM actuator to select a code value corresponding to a downward position value most approximate to the AF upward position value in a downward position value column and to implement the auto focusing adjustment using the corrected code value, if the difference is not smaller than the pre-set level.