Increasing scanning resolution through driving system control

Abstract

A method of increasing the scanning resolution of a scanner through controlling its driving system. By suitably adjusting the timing relationship between motor pulses and exposure pulses, a low-resolution driving system can produce a high-resolution image with no additional production cost incurred.

1. A method of increasing scanning resolution of a scanner through controlling its driving system, comprising the steps of:
 providing shift gate clock pulses to a charge-coupled device such that one shift gate clock pulse period corresponds to an exposure cycle for the charge-coupled device; and  
 providing motor pulses to a motor such that one motor pulse period corresponds to a plurality of exposure cycles for the charge-coupled device.  
 
     
     
       2. The method of  claim 1 , wherein the motor includes a stepper motor. 
     
     
       3. A method of increasing scanning resolution of a scanner through controlling its driving system, comprising the steps of:
 providing motor pulse signals to a driving motor of the scanner;  
 providing shift gate clock pulse signals to a charge-coupled device of the scanner; and  
 adjusting a timing relationship between the motor pulse and the shift gate clock pulse such that one motor pulse cycle corresponds to a plurality of shift gate clock pulse cycles.  
 
     
     
       4. The method of  claim 3 , wherein one shift gate clock cycle corresponds to an exposure cycle for the charge-coupled device. 
     
     
       5. The method of  claim 3 , wherein the motor includes a stepper motor. 
     
     
       6. The method of  claim 1 , further comprising providing motor pulses to a motor such that one motor pulse period corresponds to two exposure cycles for the charge- coupled device.   
     
     
       7. The method of  claim 3 , further comprising adjusting a timing relationship between the motor pulse and the shift gate clock pulse such that one motor pulse cycle corresponds to four shift gate clock pulse cycles. 
     
     
       8. An apparatus, comprising:
   a driving controller of a scanning device having a driving motor and a charge - coupled device, said driving controller adapted to:        provide motor pulse signals to the driving motor;        provide shift gate clock pulse signals to the charge - coupled device; and        adjust a timing relationship between the motor pulse and the shift gate clock pulse such that one motor pulse cycle corresponds to a plurality of shift gate clock pulse cycles.     
     
     
       9. The apparatus of  claim 8 , wherein said driving controller is further adapted to:
   adjust the timing relationship between the motor pulse and the shift gate clock pulse such that one shift gate clock cycle corresponds to an exposure cycle for the charge - coupled device.     
     
     
       10. The apparatus of  claim 8 , wherein the motor comprises a stepper motor. 
     
     
       11. The apparatus of  claim 8 , wherein said driving controller is further adapted to:
   adjust a timing relationship between the motor pulse and the shift gate clock pulse such that one motor pulse cycle corresponds to two shift gate clock pulse cycles.     
     
     
       12. An apparatus, comprising:
   a scanner driving system of a scanner, adapted to:        provide shift gate clock pulses to a charge - coupled device of the scanner such that one shift gate clock pulse period corresponds to an exposure cycle for the charge - coupled device; and        provide motor pulses to a motor of the scanner such that one motor pulse period corresponds to a plurality of exposure cycles for the charge - coupled device.     
     
     
       13. The apparatus of  claim 12 , wherein the motor comprises a stepper motor. 
     
     
       14. The apparatus of  claim 12 , wherein said scanner driving system is further adapted to:
   provide motor pulses to a motor of the scanner such that one motor pulse period corresponds to four exposure cycles for the charge - coupled device.