Position Sensing Apparatus Using Visible-Infrared Scanning
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Solution Overview
Problem
In image forming apparatuses, the position of a recording sheet tends to change, leading to image displacement, and existing technologies struggle to accurately detect and correct positional displacement using invisible marks.
Innovation Solution
A position sensing apparatus that uses a scanner to emit both visible and invisible light, with a position detector correcting the scanning results to distinguish and detect invisible alignment images, allowing for precise positional correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invisible marks are used for position detection, then positional accuracy is improved, but detection reliability deteriorates due to difficulty in distinguishing invisible marks from background
Solution Approach 1:
The patent introduces visible marks as an intermediary element to facilitate the detection of invisible marks. The visible marks serve as reference points that help the detection system locate and distinguish invisible marks from the background, thereby improving detection reliability while maintaining positional accuracy through the invisible marks
Solution Approach 2:
The patent utilizes marks with different visibility characteristics - visible marks that can be detected by standard scanners and invisible marks that are only detectable by specific detection methods. This differentiation in visibility properties allows the system to reliably distinguish between reference points and target position markers, resolving the contradiction between precision and reliability
2Measurement precision
If complex image processing is used to detect invisible marks, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the marking system into two distinct types - visible marks and invisible marks - with clearly different detection requirements. This segmentation allows the use of simple detection methods for visible marks and specialized but localized processing for invisible marks, reducing overall system complexity while maintaining high detection accuracy
Solution Approach 2:
Instead of trying to directly detect invisible marks through complex processing, the patent inverts the approach by using visible marks as reference points to guide the detection of invisible marks. This inversion simplifies the detection process by providing clear reference frameworks that reduce the computational complexity required for accurate position detection
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
Enables accurate detection and correction of image position without relying on visible image formation, reducing the need for complex image processing and improving positional accuracy.
Implementation Method 1
a scanner configured to emit light to an object to scan an image of the object... outputs a first result of scanning obtained by irradiating the object with visible light
Implementation Method 2
outputs a second result of scanning obtained by irradiating the object with invisible light... detect an invisible alignment image based on the corrected second result of scanning
Data Source
AI summary
A position sensing apparatus and a method of detecting a position. The position sensing apparatus includes a scanner configured to emit light to an object to scan an image of the object, and a position detector. In the position sensing apparatus, the scanner outputs a first result of scanning obtained by irradiating the object with visible light and a second result of scanning obtained by irradiating the object with invisible light to the position detector, and the position detector corrects the second result of scanning based on the first result of scanning, and to detect an invisible alignment image based on the corrected second result of scanning. The method includes emitting light to an object using a scanner, obtaining a first result of scanning as the scanner irradiates the object with visible light, and obtaining a second result of scanning as the scanner irradiates the object with invisible light.