Recording Material Detection Light-Shielding Reference Panel
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Solution Overview
Problem
Conventional recording material detection systems with movable reference panels complicate mechanisms, increase apparatus size, and costs due to noise from reflected light from non-reference surfaces, reducing the effective range for determining the surface state of recording materials.
Innovation Solution
A fixed reference panel configuration on the side of the light-receiving unit with light-shielding portions to prevent noise from non-reference surfaces, allowing for accurate detection of the recording material's surface state by controlling light emission and shading corrections using reference surfaces and light-shielding members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable reference panel configuration is used to avoid dirt and scratches, then the reference panel can be protected from contamination, but the mechanism becomes complicated and the apparatus size increases
Solution Approach 1:
Instead of moving the reference panel to protect it from contamination, the patent inverts the approach by making the light-receiving unit movable relative to the fixed reference panel. This allows the detection unit to move away from the recording material path when not in use, preventing contamination while avoiding the complexity of moving the reference panel itself
Solution Approach 2:
The patent introduces a light-shielding portion as an intermediary element that covers the reference panel when the light-receiving unit is not in use. This mediator protects the reference panel from contamination without requiring the reference panel or light-receiving unit to move, thereby simplifying the mechanism
2Reliability
If the reference panel is positioned to avoid dirt and scratches, then contamination is reduced, but the effective range for detecting recording material surface state is reduced
Solution Approach 1:
The patent inverts which component moves: instead of moving the reference panel, the light-receiving unit is made movable. This allows the reference panel to remain in a fixed position that maximizes detection range while the light-receiving unit moves to avoid contamination during non-detection periods
Solution Approach 2:
The patent resolves the spatial conflict by introducing temporal dimension - the light-receiving unit moves between detection position (maximizing detection range) and retracted position (avoiding contamination). This dimensional change allows both requirements to be satisfied at different times
3Measurement precision
If light-shielding portions are added to cover non-reference surfaces, then noise from reflected light is reduced, but the device complexity increases
Solution Approach 1:
The patent extracts the light-shielding function from the main detection mechanism by using the movable light-receiving unit itself to block light when retracted. The light-shielding portions are integrated into the housing structure rather than being separate active components, reducing overall device complexity while maintaining noise reduction capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces noise from non-reference surfaces, expands the effective image range for determining the recording material's surface state, and improves the accuracy of image formation and detection conditions, enhancing the reliability and efficiency of the recording material detection process.
Implementation Method 1
detect information on a surface state of the recording material on the basis of reflected light from the surface of the recording material
Implementation Method 2
detect information on a surface state of the recording material on the basis of the reflected light from the reference surface
Implementation Method 3
prevent the light from the light source from being reflected from the portion of the reference panel other than the reference surface and being received by the light-receiving unit
Data Source
AI summary
A recording material detection apparatus having a detecting device configured to detect a surface state of a recording material on the basis of reflected light from a surface of the recording material includes a reference surface to be irradiated with light from a light source, the detecting device includes a light-shielding portion configured to control conditions for detecting information relating to the surface state of the recording material on the basis of the reflected surface from the reference surface, and cover a portion of the reference panel other than the reference surface so as to prevent the light from the light source from being reflected from the portion of the reference panel other than the reference surface and being received by the light-receiving unit.