Integrated Coil Pattern for Toner Concentration Detection
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Solution Overview
Problem
Conventional toner concentration detection systems in developing devices face accuracy issues due to mounting tolerances and environmental temperature expansions, which affect the positioning of coil patterns and subsequently the detection sensitivity and accuracy.
Innovation Solution
Integrating the coil pattern directly onto the inner wall surface of the developer container using the Molded Interconnect Device (MID) method, allowing for precise positioning and improved sensitivity by eliminating the need for separate mounting and reducing the impact of environmental factors on detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil pattern is mounted on the inner wall surface of the developer container using a separate printed board, then the detection system can be assembled, but mounting tolerances and thermal expansion cause position deviation and reduce detection accuracy
Solution Approach 1:
The coil pattern is integrated directly into the developer container body, eliminating the separate printed board mounting structure. This merging of the coil support function into the container itself removes the mounting interface that causes tolerance accumulation and position deviation, thereby improving both manufacturing precision and detection reliability.
2Measurement precision
If the coil pattern is mounted on a separate printed board, then the circuit can be assembled, but the distance between the coil and developer increases, reducing detection sensitivity
Solution Approach 1:
By integrating the coil pattern directly into the developer container, the coil is positioned at the minimum possible distance from the developer material. This eliminates the additional distance introduced by separate board mounting and spacing requirements, thereby maximizing detection sensitivity while maintaining circuit functionality.
3Measurement precision
If the coil pattern is formed separately from the developer container, then manufacturing flexibility is maintained, but mounting tolerance and environmental temperature expansion affect detection accuracy
Solution Approach 1:
The coil pattern and developer container are formed as a single integrated structure, eliminating the mounting interface that is susceptible to thermal expansion and temperature-induced position changes. This integration removes the harmful effect of environmental temperature variations on detection accuracy, as there is no separate mounting structure to expand or shift with temperature changes.
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
Enhances the detection accuracy and sensitivity of toner concentration by ensuring the coil pattern is in close contact with the developer, minimizing the influence of mounting tolerances and environmental temperature fluctuations, thereby improving the overall performance of the toner concentration detection system.
Implementation Method 1
a oscillation circuit including a resonance circuit constituted by a coil and a circuit portion containing a capacitor and configured to oscillate a signal for detecting a toner concentration
Data Source
AI summary
A developing device includes a developer carrying member configured to carry a developer, containing toner and a carrier, for developing an electrostatic latent image formed on an image bearing member, a developer container configured to accommodate the developer, and an oscillation circuit including a resonance circuit including a coil and a circuit portion containing a capacitor and configured to oscillate a signal for detecting a toner concentration of the developer accommodated in the developer container. The coil is formed integrally with the developer container by a metal film, and the coil is disposed on an inner wall surface of the developer container.