Speed calculation device, image forming device, and storage medium

A speed calculation device comprising:

• a generation component that generates a plurality of pulse signals with different phases in accordance with rotation of a rotating body;
• a detection component that detects rises and falls of respective pulses of the plurality of pulse signals generated by the generation component;
• a duration calculation component that, each time a rise or fall is detected by the detection component, calculates a total duration of a pre-specified first number of durations representing detection intervals of rises or falls detected by the detection component prior to the current rise or fall detected by the detection component;
• and
• a speed calculation component that calculates a speed relating to rotation of the rotating body on the basis of a pre-specified second number of the total durations calculated by the duration calculation component and a rotation angle of the rotating body that corresponds to one pulse of the pulse signals.

A speed calculation device comprising:

• a generation component that generates a plurality of pulse signals with different phases in accordance with rotation of a rotating body;
• a detection component that detects rises and falls of respective pulses of the plurality of pulse signals generated by the generation component;
• a duration calculation component that, each time a rise or fall is detected by the detection component, calculates a total duration of a pre-specified first number of durations representing detection intervals of rises or falls detected by the detection component prior to the current rise or fall detected by the detection component;
• and
• a speed calculation component that includes
• a speed detection section that detects a speed relating to rotation of the rotating body on the basis of the total duration and a rotation angle of the rotating body that corresponds to one pulse of the pulse signals, and
• a speed calculation section that, after a pre-specified number of speeds have been detected by the speed detection section, calculates by estimation, on the basis of a pre-specified second number of the speeds relating to rotation of the rotating body that have been detected by the speed detection section, the speed relating to rotation of the rotating body that is to be detected subsequent to the speed relating to rotation of the rotating body currently detected by the speed detection section.

A storage medium readable by a computer, the storage medium storing a program of instructions executable by the computer to function as:

• a detection component that detects rises and falls of respective pulses of a plurality of pulse signals generated by a generation component, which generates the plurality of pulse signals with different phases in accordance with rotation of a rotating body;
• a duration calculation component that, each time a rise or fall is detected by the detection component, calculates a total duration of a pre-specified number of durations representing detection intervals of rises or falls detected by the detection component prior to the current rise or fall detected by the detection component;
• and
• a speed calculation component that calculates a speed relating to rotation of the rotating body on the basis of the total duration and a rotation angle of the rotating body that corresponds to one pulse of the pulse signals.

A storage medium readable by a computer, the storage medium storing a program of instructions executable by the computer to function as:

• a detection component that detects rises and falls of respective pulses of a plurality of pulse signals generated by a generation component, which generates the plurality of pulse signals with different phases in accordance with rotation of a rotating body;
• a duration calculation component that, each time a rise or fall is detected by the detection component, calculates a total duration of a pre-specified first number of durations representing detection intervals of rises or falls detected by the detection component prior to the current rise or fall detected by the detection component;
• and
• a speed calculation component that calculates a speed relating to rotation of the rotating body on the basis of a pre-specified second number of the total durations calculated by the duration calculation component and a rotation angle of the rotating body that corresponds to one pulse of the pulse signals.

A storage medium readable by a computer, the storage medium storing a program of instructions executable by the computer to function as:

• a detection component that detects rises and falls of respective pulses of a plurality of pulse signals generated by a generation component, which generates the plurality of pulse signals with different phases in accordance with rotation of a rotating body;
• a duration calculation component that, each time a rise or fall is detected by the detection component, calculates a total duration of a pre-specified first number of durations representing detection intervals of rises or falls detected by the detection component prior to the current rise or fall detected by the detection component;
• and
• a speed calculation component that includes
• a speed detection section that detects a speed relating to rotation of the rotating body on the basis of the total duration and a rotation angle of the rotating body that corresponds to one pulse of the pulse signals,
• and a speed calculation section that, after a pre-specified number of speeds have been detected by the speed detection section, calculates by estimation, on the basis of a pre-specified second number of the speeds relating to rotation of the rotating body that have been detected by the speed detection section, the speed relating to rotation of the rotating body that is to be detected subsequent to the speed relating to rotation of the rotating body currently detected by the speed detection section.