| 摘要 |
PURPOSE:To prevent the unequal image pitches due to a temp. change of the deflection scanner. CONSTITUTION:Outer rings 15 having annular hollow grooves 15a are respectively fitted onto a shaft 14 having annular hollow grooves 14a at two points and rollers 16 are fitted between respective hollow grooves 14a, 15a and a prepressuring spring 17 is disposed between the outer rings 15. The outer rings 15 are fixed by an adhesive 18 to a sleeve 19 consisting of a material having the coefft. of thermal linear expansion approximately coinciding with the coefft. of thermal expansion of the shaft 14 in the state of energizing the outer rings in the directions of parting the outer rings from each other by the prepressurizing spring 17. Since the coeffts. of thermal linear expansion of the shaft 14 and the sleeve 19 are approximately coincident with each other, the prepressure applied on rollers 16 does not change in spite of a change in temp. |
