Patent ID: 7986120

Claim:
A pulse motor control device comprising: a drive pulse generator configured to generate a drive pulse in accordance with a set cycle; a pulse motor driver configured to generate an excitation current of a pattern corresponding to the number of division per one step of a pulse motor based on the drive pulse supplied from the drive pulse generator, the number of division being set in the pulse motor driver, the pulse motor driver supplying the excitation current to the pulse motor to thereby drive the pulse motor based on micro-step driving; and a controller configured to set the cycle in the drive pulse generator every time the drive pulse is supplied from the drive pulse generator, wherein the controller switches the number of division between a first number of division N and a second number of division M smaller than the first number of division N, and sets the number of division in the pulse motor driver, a cycle multiplier configured to multiply the cycle that is to be set in the drive pulse generator by the controller is provided, and multiplication of the cycle by the cycle multiplier is so carried out that the cycle set in the drive pulse generator in a state in which the second number of division M is set in the pulse motor driver becomes N/M times the cycle set in the drive pulse generator in a state in which the first number of division N is set in the pulse motor driver.