Pulse generating device, rotator module, rotational speed control device, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorTatsuya Watahiki
Life of this patent
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Abstract
A pulse generating device includes a rotatable disc having a plurality of patterns that are formed on a surface of the rotatable disc in a circumferential direction of the rotatable disc, and three pulse generators to each detect the plurality of patterns formed on the rotatable disc and to respectively generate three pulse signals each corresponding to a rotational speed of the rotatable disc based on the detected patterns. The three pulse generators are evenly spaced at intervals of 120 degrees of angle with respect to a rotational axis of the rotatable disc in the circumferential direction of the rotatable disc.
Claims6
A rotational speed control device for controlling a rotational speed of a rotator, the control device comprising:
- a rotatable disc having a plurality of patterns that are formed on a surface of the rotatable disc in a circumferential direction of the rotatable disc, the rotatable disc configured to rotate in synchronization with the rotator;
- three pulse generators evenly spaced at intervals of 120 degrees around the circumference of the rotatable disc, configured to each detect the plurality of patterns formed on the rotatable disc and to respectively generate three pulse signals each corresponding to a rotational speed of the rotatable disc based on the detected patterns;
- and
- a controller configured to control the rotational speed of the rotator based on a signal from which an error component superimposed on the three pulse signals respectively generated by the three pulse generators is removed.
Dependencies are inferred from the claim text.