Rotation Detection Device Eccentric Error Offset
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Solution Overview
Problem
Existing rotation-information detecting devices face challenges in accurately calculating true rotational errors due to eccentric errors in rotary members, particularly when using a single detector, which limits the precision of rotation control in image forming apparatuses.
Innovation Solution
A rotation-information detecting device with two detectors arranged at an angle of π/N along the circumferential direction of a rotary member, where N is an integer of 2 or greater, and a computation unit that calculates true rotational errors by offsetting eccentric errors based on current and past detector outputs shifted by phases of (nπ)/N, effectively removing eccentric components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detector is used to detect rotation information, then the device complexity is reduced, but the measurement precision of true rotational error deteriorates due to eccentric errors
Solution Approach 1:
The rotation detection function is segmented into multiple detectors arranged at specific angular intervals around the rotary member. Each detector captures rotation information from a different angular position, and the computation unit synthesizes these segmented measurements to calculate true rotational error while eliminating eccentric error components through mathematical processing.
2Measurement precision
If detectors are arranged to achieve accurate error calculation, then measurement precision improves, but the ease of operation deteriorates due to potential interference with apparatus components
Solution Approach 1:
The detector arrangement adopts different angular spacing configurations based on local operational requirements. The computation unit processes detection information with the understanding that detectors may be positioned at non-uniform intervals, allowing flexible placement that avoids interference with image forming components while maintaining accurate eccentric error compensation through appropriate mathematical processing.
Data Source
AI summary
A rotation-information detecting device including: a rotatable rotary member having plural detection target portions arranged at predetermined intervals over an entire circumference of the rotary member; two detectors that are fixedly arranged at two positions of the rotary member in a rotating direction, and can detect the detection target portions; and a computation unit that computes rotation information of the rotary member based on detection information, wherein the two detectors are arranged along the circumferential direction of the rotary member at an interval of an angle of π/N, and wherein the computation unit includes an offset calculating section that offsets an eccentric error of the rotary member based on outputs of the two detectors at a current time point and n outputs at time points back from the current time point by phases of (nπ)/N, to calculate a true rotational error.