Patent ID: 8705186
Filing Date: 2014-04-22
Classification: G02B

Abstract:
1. A barrel driving system, comprising: a driving module; a zooming barrel, being controlled by the driving module to move to an initial position, a first zooming position or a second zooming position; a first position detection unit, detecting the driving module and outputting a first detection signal; a first register, storing a first count value according to the first detection signal; a second position detection unit; a focusing barrel, moving by being controlled through the driving module, wherein the focusing barrel is moved correspondingly to the zooming barrel so that the focusing barrel moves to triggers the second position detection unit to generate a second detection signal when the zooming barrel moves from the initial position to the first zooming position or from the first zooming position to the second zooming position respectively; a second register, storing a second count value according to the second detection signal; a storage unit, storing a lookup table which records multiple predetermined values and the second count values corresponding to the multiple predetermined values; and a processing unit, wherein when the second position detection unit is triggered, the processing unit reads the predetermined value corresponding to the second count value from the storage unit, and stores the predetermined value in the first register to replace the first count value stored in the first register.