Lenticular Sheet Posture Detection for Recording Apparatus
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Solution Overview
Problem
Existing recording apparatuses fail to accurately detect the tilt of a recording medium, as current detection methods cannot differentiate between the correct and tilted postures of the medium, leading to suboptimal image formation.
Innovation Solution
A posture detecting device with a movable detecting mechanism that uses a lenticular sheet with first and second detection targets, arranged at different intervals and directions, to determine the tilt by distinguishing detection results when the medium is in its reference posture versus when it is tilted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only ribs arranged in one direction are provided on the recording medium, then the device complexity is reduced, but the measurement precision of tilt detection deteriorates
Solution Approach 1:
The detection target is segmented into multiple groups of ribs arranged in different directions (first direction and second direction perpendicular to it). Each group provides detection capability in its specific orientation, enabling comprehensive tilt detection in multiple directions without requiring a single complex detection system.
Solution Approach 2:
The patent transitions from detecting ribs in only one direction to detecting ribs in multiple directions by adding the second direction perpendicular to the first. This dimensional expansion allows the detection mechanism to capture tilt information from different angular perspectives, improving measurement precision.
2Measurement precision
If detection target parts are provided on the recording medium, then the measurement precision of tilt detection is improved, but the device complexity increases
Solution Approach 1:
The detection target structure serves multiple functions: the ribs arranged in the first direction detect tilt in the second direction, while ribs arranged in the second direction detect tilt in the first direction. This multi-functional design allows a single integrated structure to provide comprehensive detection capability without requiring separate detection systems for each direction.
Solution Approach 2:
The patent employs asymmetric arrangement of detection targets by providing ribs in both the first direction and the second direction (perpendicular to it) with different spacing patterns. This asymmetric design creates distinct detection signatures for different tilt conditions, enabling precise tilt detection while maintaining manageable complexity.
3Reliability
If the recording medium is tilted from the reference posture, then the image quality may be affected, but the detection mechanism cannot distinguish between reference and tilted postures
Solution Approach 1:
The detection mechanism provides feedback about the actual posture of the recording medium by detecting the positions and orientations of ribs relative to the reference posture. This feedback information enables the system to determine whether the medium is tilted and by how much, allowing for corrective actions to be taken.
Solution Approach 2:
The patent uses different spacing patterns of ribs in the first and second directions to create distinct detection signatures. When the medium is in the reference posture, specific ribs are detected at expected positions. When tilted, the detection pattern changes, providing clear information about the posture deviation.
Data Source
AI summary
There is provided a posture detecting device including: a detecting mechanism movable in a scanning direction relatively to a medium to detect a detection target; and a posture determining mechanism determining a tilt of the medium from a reference posture based on a detection result of the detection target, wherein as the detection target, the medium has a plurality of first detection targets each extending in an intersecting direction intersecting with the scanning direction at a predetermined angle and arranged at equal intervals in the scanning direction; and a plurality of second detection targets each extending in the scanning direction and arranged at equal intervals in the intersecting direction, under a condition that the medium is in the reference posture.