Optical Unit State Detection in Image Forming Apparatus
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Solution Overview
Problem
Existing image forming apparatuses require complex and costly exclusive circuits for detecting whether exchangeable units, such as process cartridges, transfer belt units, and fixing units, are new or old, leading to increased costs and potential manual operation errors.
Innovation Solution
An image forming apparatus with an optical detecting device and a rotatable member having first and second light-blocking surfaces, where the control unit discriminates the state of the unit based on the detection result, allowing for simple and cost-effective detection of new or old units without relying on manual operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fuse detection or micro-switch operation is used to detect old/new units, then unit state detection is achieved, but device complexity and cost increase due to additional circuits and components
Solution Approach 1:
The patent replaces electrical detection methods (fuse blowout detection, micro-switch operation) with optical detection. A light source emits light that passes through or reflects off the rotatable member with light-blocking surfaces, and a photodetector detects the light intensity changes. This optical system eliminates the need for complex electrical circuits, fuses, and micro-switches, thereby reducing device complexity while maintaining detection accuracy.
Solution Approach 2:
The patent uses optical information (light blocking patterns) to represent the unit state instead of using physical electrical components. The rotatable member with specific light-blocking surfaces creates distinct optical signatures that copy the unit's operational history, allowing state detection through light intensity patterns rather than electrical signals.
2Ease of operation
If manual reset operation is required for new units, then user control is maintained, but operation errors occur and ease of operation decreases
Solution Approach 1:
The patent enables automatic detection of unit state by the control unit through optical sensing. When a new unit is installed, the rotatable member's light-blocking surfaces create detectable optical patterns that automatically signal the control unit to reset the usage history. This self-service mechanism eliminates manual reset operations, preventing user errors while improving ease of operation.
Solution Approach 2:
The optical detection system provides immediate feedback to the control unit about the unit state. The photodetector continuously monitors light intensity changes caused by the rotatable member, and this feedback triggers automatic reset operations when new unit conditions are detected, ensuring reliable operation without manual intervention.
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 the discrimination of exchangeable unit states with a simple constitution, minimizing cost increases and reducing the likelihood of manual operation errors, while effectively resetting usage history for new units.
Implementation Method 1
a rotatable member having a first light-blocking surface for blocking light and a second light-blocking surface different from the first light-blocking surface
Data Source
AI summary
An image forming apparatus includes an optical detecting device; a movable unit including a rotatable member having a first light-blocking surface and a second light-blocking surface; and a control unit. The movable unit rotates with rotation of the rotatable member so that the second light-blocking surface is movable to a first position where the optical detecting device is light-blocked and a second position where the optical detecting device is not light-blocked, and includes a locking member for locking the second light-blocking surface in the second position. When the first and second light-blocking surfaces pass through a detecting portion of the optical detecting device, the control unit discriminates a state of the movable unit on the basis of a detection result of the optical detecting device.