Patent ID: 6992459
Filing Date: 2006-01-31
Classification: H04N

Abstract:
1. An apparatus for controlling a stepping motor, comprising: synchronous signal receiving means for receiving a synchronous signal generated in a period corresponding to N (natural Number) times a period of one-line of an image; line trigger producing means for producing N (natural number) line triggers synchronously with reception of the synchronous signal; instruction receiving means for receiving a motor control instruction from a CPU synchronously with the reception of the synchronous signal, and motor control means for effecting the control of said stepping motor until at least the occurrence of a next synchronous signal, on the basis of the line triggers produced by said line trigger producing means in response to the motor control instruction received by said instruction receiving means, wherein said motor control means includes first memory means for holding timer data for advancing a phase of said stepping motor and second memory means for holding the number of steps of the timer data, and said stepping motor is controlled on the basis of the held timer data and the held number of steps, wherein said motor control means is synchronized with the line triggers produced by said producing means and controls acceleration/deceleration of said stepping motor by switching acceleration/deceleration data tables comprised of the timer data and the number of steps, and wherein said instruction receiving means receives the motor control instruction from the CPU synchronously with the reception of the synchronous signal even after the control of acceleration/deceleration is ended.