Discriminating Device Optical Unit Magnification Control
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Solution Overview
Problem
Existing discriminating devices for image forming apparatuses face challenges in achieving both a wide detection region and maintaining detection accuracy, particularly when the recording material shifts, as they often compromise on one aspect at the expense of the other.
Innovation Solution
A discriminating device with a light receiving unit and an optical unit configured to satisfy specific magnification conditions, ensuring that the imaging system is close to a telecentric optical system in the Z direction while being non-telecentric in the Y direction, allowing for a larger reading range while minimizing magnification variations due to shifts in the recording material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telecentric optical system is used, then detection accuracy is retained, but detection region becomes narrower
Solution Approach 1:
The optical system is segmented into two distinct functional parts: a telecentric optical system component for maintaining detection accuracy, and a non-telecentric optical system component for expanding the detection region. This segmentation allows each part to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the optical system are assigned different optical properties. The telecentric portion provides accurate magnification for precision measurement, while the non-telecentric portion provides wider field of view for broader detection coverage. Each region optimizes local performance according to its specific function.
2Area of stationary object
If a non-telecentric optical system is used, then detection region is wider, but detection accuracy deteriorates due to magnification variation
Solution Approach 1:
The optical system is divided into telecentric and non-telecentric sections, allowing the non-telecentric part to provide wide detection region while the telecentric part compensates for magnification variations to maintain accuracy.
Solution Approach 2:
The optical system employs asymmetric design where the telecentric and non-telecentric components are positioned and configured differently to serve their respective functions. The telecentric portion handles precision requirements while the non-telecentric portion handles coverage requirements.
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
The solution enables a larger detection region while maintaining high detection accuracy, suppressing the deterioration of discrimination performance caused by magnification variations, and is cost-effective by integrating the illumination and imaging optical systems within a single light guiding member.
Implementation Method 1
an optical unit configured to guide the light beam from the detected surface to the light receiving unit
Implementation Method 2
an optical unit configured to guide the light beam from the detected surface to the light receiving unit
Implementation Method 3
a light receiving unit configured to receive a light beam from a detected surface
Data Source
AI summary
Provided is a discriminating device including a light-receiving unit receiving light beam from a detected surface (DS) and an optical unit (OU) guiding light beam from DS to light-receiving unit, and satisfying following conditional expressions:0.01≤|βm1/βm0−1|, and1<|βm1/βm0−1|/|βs1/βs0−1|,where βm0 represents a magnification of OU with respect to a first direction in a first cross section parallel to DS when DS is at a first position, βm1 represents a magnification of OU with respect to first direction in first cross section when DS is at a second position shifted from first position by +0.2 mm in a direction perpendicular to DS, βs0 represents a magnification of OU with respect to a second direction perpendicular to first direction in first cross section when DS is at first position, and βs1 represents a magnification of OU with respect to second direction in first cross section when DS is at second position.