Toner Cartridge Optical Sensor Shielding for Accurate Remaining Detection
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Solution Overview
Problem
Existing image forming apparatuses with detachable process cartridges lack effective mechanisms for accurately detecting the remaining toner amount without exposing the light emitting and receiving portions before the cartridge is mounted, leading to potential interference and inaccurate readings.
Innovation Solution
An image forming apparatus with a movable detecting unit and a shielding member that positions the light emitting and receiving portions within an opening member, allowing for precise toner detection by shielding or exposing these components based on the cartridge's mounting state, using an urging force and pressed portions to adjust their positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light emitting portion and light receiving portion are always exposed for toner detection, then the detection function is always available, but the light emitting and receiving elements are contaminated by toner dust reducing detection accuracy
Solution Approach 1:
The detecting unit is made movable between a first position (retracted) and a second position (extended) through which the light passes. The shielding member is also made movable between a third position (shielding) and a fourth position (exposed). This dynamic configuration allows the system to switch between protection mode and detection mode, resolving the contradiction between continuous detection availability and element protection from contamination.
Solution Approach 2:
The urging means (spring) preliminarily positions the detecting unit in the first position and the shielding member in the third position before detection is needed. This preliminary protective positioning prevents contamination before it occurs, and the system only transitions to the exposed/detected position when actually needed for toner level detection.
2Ease of operation
If the detecting unit is always positioned to expose light emitting and receiving portions, then toner detection is always possible, but the apparatus size increases due to required space for movement and shielding mechanisms
Solution Approach 1:
Both the detecting unit and shielding member are designed to move along the optical axis direction. This dynamic arrangement allows the system to achieve full detection functionality only when needed (when cartridge is installed and detecting unit extends to second position), rather than requiring constant exposure and large space allocation for continuous detection readiness.
Solution Approach 2:
The detecting unit is positioned within the apparatus main body in a compact manner, moving along the optical axis. The shielding member is integrated with the opening member structure. This nested arrangement minimizes the space required for the detection mechanism while maintaining full functionality when needed.
3Measurement precision
If the detecting unit is moved from first position to second position, then light emitting and receiving portions are exposed for detection, but the urging force must be overcome requiring additional mechanical design
Solution Approach 1:
The detecting unit is designed to move from the first position to the second position through being pressed at the pressed portion, which naturally occurs when the process cartridge is installed in the apparatus main body. The cartridge installation process itself provides the force needed to overcome the urging means, eliminating the need for separate actuation mechanisms. The system uses the installation action to automatically position the detecting unit for detection.
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 and reliable detection of remaining toner levels in process cartridges, minimizing interference and ensuring consistent operation by shielding or exposing the light components as needed during mounting, thereby improving user notifications and maintenance efficiency.
Implementation Method 1
a light emitting portion configured to emit light, a light receiving portion configured to receive the light emitted by the light emitting portion
Data Source
AI summary
An apparatus main body of an image forming apparatus includes an opening member; an urging portion; a detecting unit including a light emitting portion, a light receiving portion, and a pressed portion; and a shielding member. When the detecting unit is positioned in a first position and the shielding member is positioned in a third position, as viewed in an optical axis direction of the light emitting portion, at least a part of the light emitting portion or at least a part of the light receiving portion is positioned inside an opening and is shielded by the shielding member. When the detecting unit is positioned in a second position and the shielding member is positioned in a fourth position, as viewed in the optical axis direction, the light emitting portion and the light receiving portion are positioned inside the opening and are not shielded by the shielding member.