Image Forming Apparatus With Segmented Developing Agent Detection
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Solution Overview
Problem
Conventional methods for detecting the remaining amount of developing agent in image forming apparatuses, such as optical sensors and antenna-system sensors, fail to accurately measure high and low levels, leading to inaccurate detection of developing agent amounts.
Innovation Solution
An image forming apparatus equipped with a highly accurate optical sensor that uses a stirring unit to mix the developing agent, a detection unit to measure the remaining amount based on pixel count, and a display unit to show the accurate amount, allowing for precise detection even when the agent is high, and switching to sensor-based detection when it falls below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical sensor is used to detect the remaining amount of developing agent, then the detection method is simple, but it cannot accurately detect high amounts of developing agent because the light is constantly blocked
Solution Approach 1:
The patent divides the detection range into two segments: high amount range (above threshold) detected by pixel count calculation, and low amount range (below threshold) detected by optical sensor. This segmentation allows each method to operate in its optimal range, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent changes the detection parameter from direct optical measurement to pixel count-based calculation when developing agent amount is high. This parameter change enables accurate detection of high amounts without requiring complex optical sensor modifications.
2Measurement precision
If an antenna-system sensor is used to detect the remaining amount of developing agent, then it can detect capacitance changes, but it cannot accurately detect small remaining amounts when capacitance becomes extremely small
Solution Approach 1:
The patent replaces the antenna-system sensor (electrical measurement) with an optical sensor and pixel count-based calculation method. This substitution allows accurate detection across the full range of developing agent amounts, particularly when capacitance values become extremely small and difficult to measure.
3Device complexity
If a single optical sensor is used for detection, then the device is simple, but it cannot provide accurate detection values when developing agent amount is high
Solution Approach 1:
The patent makes the simple optical sensor serve multiple functions: it detects both high amounts (via pixel count calculation) and low amounts (via direct optical measurement) of developing agent. This multi-functionality resolves the contradiction between device simplicity and information accuracy.
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 display of developing agent levels, overcoming the limitations of conventional sensors by using pixel count for high levels and sensor detection for lower levels, ensuring reliable operation and user notification.
Implementation Method 1
transmitting light through the developing agent containing unit and detecting the transmitted light with a light-receiving unit to determine an amount of the remaining developing agent based on the light blocked by the developing agent
Implementation Method 2
a stirring unit that stirs the developing agent in the containing unit
Data Source
AI summary
An image forming apparatus that performs image formation using a developing agent, the image forming apparatus includes a containing unit that contains the developing agent, a detection unit that detects a remaining amount of the developing agent, a calculation unit that calculates the remaining amount of the developing agent, and a display unit that displays the remaining amount of the developing agent, wherein the display unit, in a case where the remaining amount of the developing agent detected by the detection unit is a predetermined amount or more, displays a value based on the remaining amount calculated by the calculation unit, and in a case where the remaining amount of the developing agent detected by the detection unit is less than the predetermined amount, displays a value based on the remaining amount detected by the detection unit.