| 摘要 |
PURPOSE:To carry reciprocating control over a body to be driven at a high speed with high efficiency while holding a scanning speed unchanged by using a reciprocating driving device which performs smooth starting upon forward movement and inversion upon backward movement without generating an impact and moves forth at a constant speed and back at a high speed, and then varying the scanning length of an optical system. CONSTITUTION:A gear 39 rotates in a fixed direction at a fixed speed. The rotation of the gear 39 is transmitted through gear 38, 37, 36, 33, and 32, and a crank and a gear having a different number of teeth are selected to turn the crank 29 in a direction A. As the crank 29 starts rotating, a lever 30 starts crank in the direction A and increases speed smoothly. This motion is transmitted to a slider 48, which is put in linear motion to move a wire 501, thereby turning the rotation of the pulley 50 is transmitted through gears 53, 58, 59, and 62 to a shaft 63. In this case, the gear 58 has less teeth than the ger 59, so the angle of rotation of the pulley 50 is increased and its rotation is transmitted to a shaft 63. |
