| 摘要 |
PROBLEM TO BE SOLVED: To enable a low cost and silent rotation with an inexpensive constitution. SOLUTION: During standby when not performing a scanner operation such as when not performing a printout, the changeover control of the driving speed of revolution of a scanner motor M is performed to a low-speed standby speed of revolution Rs by a changeover control means. Thereby, the fixing shaft 21 and bearing sleeve 31 of an air hydrodynamic bearing device are supported in the state of floating of non-contact. Thereby, the wear of the air hydrodynamic bearing device is hardly generated even in the standby when not performing the scanner operation. The occurrence of noise and the power consumption during standby are suppressed very small. |
