Cartridge Toner Detection via Dynamic Light Emission Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses cannot accurately determine the replacement time of developing agent cartridges, leading to premature replacement of small-capacity cartridges despite remaining usable toner, resulting in inefficient use and potential image quality deterioration.
Innovation Solution
An image forming apparatus with a light emitting and receiving device system that adjusts light emission time, intensity, or sampling points based on the initial capacity of the cartridge, determining replacement time by analyzing light reception signals and adjusting thresholds or reference values to extend the usable life of small-capacity cartridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed light emission time is used for all cartridge types, then the measurement process is simple, but small-capacity cartridges are replaced prematurely reducing toner utilization efficiency
Solution Approach 1:
The light emission time is made dynamic rather than fixed, automatically adjusting based on the detected initial capacity of the cartridge. The control unit extends the light emission time when a small-capacity cartridge is detected, allowing sufficient time for toner to pass through the light path and enabling accurate measurement without premature replacement.
Solution Approach 2:
The measurement parameter (light emission time) is changed according to the cartridge type. By detecting the initial capacity and adjusting the light emission time parameter accordingly, the system optimizes the measurement process for each cartridge type, preventing premature replacement of small-capacity cartridges while maintaining simple operational procedures.
2Productivity
If the same determination threshold is used for all cartridge types, then the control logic is simple, but small-capacity cartridges cannot be used up to their proper deterioration state
Solution Approach 1:
The determination threshold parameter is adjusted based on the initial capacity of the cartridge. For small-capacity cartridges, the threshold is set to allow usage up to the proper deterioration state rather than a fixed residual amount, enabling more efficient toner utilization while maintaining straightforward control logic through automatic parameter selection.
Solution Approach 2:
Different determination thresholds are applied to different cartridge types based on their specific characteristics. Small-capacity cartridges receive a threshold setting that allows them to be used until their toner reaches the appropriate deterioration state, while large-capacity cartridges use a different threshold, optimizing each type for its specific usage pattern.
3Measurement precision
If light emission intensity is not adjusted, then the detection system is simple, but accurate determination of replacement time for different cartridge capacities is difficult
Solution Approach 1:
The light emission intensity parameter is adjusted according to the initial capacity of the cartridge detected by the detection unit. For small-capacity cartridges, the intensity is optimized to ensure accurate measurement of the light reception signal as toner passes through, enabling precise determination of replacement time while keeping the detection system relatively simple through automatic parameter adjustment.
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
This solution allows for proper utilization of toner up to its deterioration state, reducing unnecessary replacements and maintaining image quality by accurately determining the replacement time of cartridges based on their initial capacities.
Implementation Method 1
a pair of light transmission windows is oppositely provided on side walls of the cartridge, and an amount of toner within the cartridge is estimated on the basis of a light reception signal obtained by detecting light incident from one light transmission window through the other light transmission window
Data Source
AI summary
An image forming apparatus is provided. The image forming apparatus includes a mounting part configured to allow plural types of cartridges having different initial capacities of developing agent to be detachably mountable therein; a light emitting device configured to emit light into the cartridge mounted in the mounting part; a light receiving device configured to receive light emitted from the light emitting device and passed through an inside of the cartridge; a determining unit configured to determine that a replacement time of the cartridge has been reached when a ratio of time, during which an output value of the light receiving device exceeds a light reception reference value, exceeds a determination threshold value. The image forming apparatus or the cartridges are configured such that the determination of the replacement time changes according to the initial capacity of the cartridge.