Apparatus and method for driving a stepping motor and electronic apparatus using the same

Abstract

The invention provides a stepping motor driving device, method as well as electronic equipment thereof. In the stepping motor driving device (100), a driving signal generator (30) generates first driving signal (SD1) and second driving signal (SD2) which are respectively provided to coils of A phase and B phase of the stepping motor (110). First switch circuit (10) includes plural switches connected to the coil of A phase of the stepping motor, and receives the first driving signal (SD1) generated by the driving signal generator (30), and controls electricity state of A phase coil (L1). Second switch circuit (20) includes plural switches connected to the coil of B phase of the stepping motor, and receives the second driving signal (SD2) generated by the driving signal generator (30), and controls electricity state of B phase coil (L2). The driving signal generator (30) can regulate phase difference between the first driving signal (SD1) and the second driving signal (SD2).

Description

technical field [0001] The invention relates to the driving technology of a stepping motor. Background technique [0002] In recent electronic devices such as digital cameras, digital video cameras, disk drives, and printers, stepping motors are often used to adjust the positions of movable parts such as lenses, pickups, and print heads. The stepper motor is a synchronous motor that rotates synchronously with the pulse signal applied from the outside, and has good controllability in starting, stopping and positioning. Furthermore, stepper motors can be controlled open-loop and have characteristics suitable for digital signal processing. [0003] As a method for driving a stepping motor, there are two methods of unipolar driving and bipolar driving. Patent Documents 1 to 3 disclose driving techniques for stepping motors by a unipolar driving method. [0004] [Patent Document 1] JP-A-9-103096 [0005] [Patent Document 2] JP-A-2004-120957 [0006] [Patent Document 3] JP-A-...

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Problems solved by technology

[0008] Like this, in the driving method of conventional stepping motor, since the improvement of the position accuracy of the stepping motor or driving efficiency are paid attention to, so from the standpoint of quietness, that is, the noise (hereinafter also referred to as motor sound) emitted from the motor, Look, there's room for improvement

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