Dual Detection Units for Edge Positioning Accuracy

Solution Overview

Problem

Existing detection systems face challenges in accurately detecting leading and trailing edge portions of a medium before and after it is heated, as the same detection unit may struggle to meet differing requirements for detection accuracy and time depending on the medium's heated state.

Innovation Solution

A detection device comprising a first detection unit for detecting the medium's edge portions before heating and a second detection unit, distinct from the first, for detecting after heating, allowing for separate calibration and improved accuracy in both states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the same detection unit is used to detect leading and trailing edge portions of the medium before and after heating, then device complexity is reduced, but detection precision deteriorates because the detection unit cannot simultaneously satisfy different detection requirements for heated and unheated states

Engineering Contradiction:

Improvedetection unit configurationVSAvoiddetection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The detection system is divided into two separate detection units: a first detection unit for detecting leading and trailing edge portions of the medium before heating, and a second detection unit for detecting the same portions after heating. This segmentation allows each detection unit to be optimized for its specific detection conditions, thereby resolving the contradiction between device complexity and detection precision.

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If the same detection unit is used for both heated and unheated states, then the number of components is minimized, but detection precision deteriorates due to inability to meet different detection requirements

Engineering Contradiction:

Improvenumber of detection unitsVSAvoiddetection accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The detection system is divided into two separate detection units: a first detection unit for detecting leading and trailing edge portions of the medium before heating, and a second detection unit for detecting the same portions after heating. This segmentation allows each detection unit to be optimized for its specific detection conditions, thereby resolving the contradiction between device complexity and detection precision.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If a single detection unit is used for both pre-heating and post-heating detection, then device structure is simplified, but detection precision deteriorates because different detection requirements cannot be simultaneously satisfied

Engineering Contradiction:

Improvedetection system structureVSAvoiddetection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The detection system is divided into two separate detection units: a first detection unit for detecting leading and trailing edge portions of the medium before heating, and a second detection unit for detecting the same portions after heating. This segmentation allows each detection unit to be optimized for its specific detection conditions, thereby resolving the contradiction between device complexity and detection precision.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4141546B1Detection device, image forming apparatus, program, and detection method

Publication Date: 2024.04.24 FUJIFILM BUSINESS INNOVATION CORP

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AI summary

A detection device includes a first detection unit that detects a leading edge portion and a trailing edge portion of a medium before the medium is heated, and a second detection unit that differs from the first detection unit and that detects the leading edge portion and the trailing edge portion of the medium after the medium is heated.