Position control system

1. A position control system comprising:

a fixed portion,

a moving portion that is relatively movable with respect to said fixed portion,

a position-detection portion that detects a position of said moving portion with respect to a reference position of said fixed portion,

a drive portion that applies driving force to said moving portion thereby moving said moving portion,

a control portion that controls the driving force of said drive portion,

an input portion for inputting a drive target position to operation portions for said moving portion, and

the operation portions operate a first deviation that is a difference between the drive target position and said reference position and a second deviation that is a difference between a position detected by said position-detection portion and the drive target position, wherein:

said control portion is operable to determine the driving force to be applied to said drive portion based on a correction coefficient acquired based on said first deviation and said second deviation.

2. The position control system as recited in claim 1 , which comprises a plurality of sets, each including said position-detection portion, said drive portion, said control portion, said input portion, and said operation portions wherein said control portion in a certain set is operable to acquire said correction coefficient based on said first deviation for its own set and a first deviation for other set.

3. The position control system as recited in claim 1 , wherein said drive portion includes a voice coil motor comprising a magnet portion and a coil.

4. The position control system as recited in claim 1 , which further comprises a flexible cable connected to said moving portion, wherein:

said control portion is operable to acquire said correction coefficient based on driving force characteristics having force energized by said flexible cable taken into account.

5. The position control system as recited in claim 1 , wherein said control portion executes PID control including proportional operation, integral operation and differential operation, and said correction coefficient is operated with respect to results of proportional operation, integral operation and differential operation.

6. The position control system as recited in claim 1 , wherein said control portion executes PID control including proportional operation, integral operation and differential operation, and said correction operation is operated with respect to results of integral operation.

7. The position control system as recited in claim 3 , wherein:

a magnetic flux density generated from said magnet portion is asymmetric with respect to said reference position in a direction of said movement, and

said control portion is operable to acquire said correction coefficient based on driving force characteristics having asymmetry of said magnetic flux density taken into account.

8. A position control system comprising:

a fixed portion,

a moving portion that is relatively movable with respect to said fixed portion,

a position-detection portion that detects a position of said moving portion with respect to a reference position of said fixed portion,

a drive portion that applies driving force to said moving portion thereby moving said moving portion,

a control portion that controls the driving force of said drive portion, and

an input portion for inputting a drive target position for said moving portion, wherein:

said control portion is operable to determine the driving force to be applied to said drive portion based on a correction coefficient acquired based on a first deviation that is a difference between a position detected by said position-detection portion and said reference position, and a second deviation that is a difference between the position detected by said position-detection portion and the drive target position inputted into said input portion.

9. The position control system as recited in claim 8 , which comprises a plurality of sets, each including said position-detection portion, said drive portion, said control portion, and said input portion, wherein said control portion in a certain set is operable to acquire said correction coefficient based on said first deviation for its own set and a first deviation for other set.

10. The position control system as recited in claim 8 , wherein said drive portion includes a voice coil motor comprising a magnet portion and a coil.

11. The position control system as recited in claim 8 , which further comprises a flexible cable connected to said moving portion, wherein:

said control portion is operable to acquire said correction coefficient based on driving force characteristics having force energized by said flexible cable taken into account.

12. The position control system as recited in claim 8 , wherein said control portion executes PID control including proportional operation, integral operation and differential operation, and said correction coefficient is operated with respect to results of proportional operation, integral operation and differential operation.

13. The position control system as recited in claim 8 , wherein said control portion executes PID control including proportional operation, integral operation and differential operation, and said correction operation is operated with respect to results of integral operation.

14. The position control system as recited in claim 10 , wherein:

a magnetic flux density generated from said magnet portion is asymmetric with respect to said reference position in a direction of said movement, and

said control portion is operable to acquire said correction coefficient based on driving force characteristics having asymmetry of said magnetic flux density taken into account.