Developer Amount Detector Positioning Mechanism
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Solution Overview
Problem
Existing developer amount detectors in image forming apparatuses face accuracy issues due to displacement of optical elements during unit installation, leading to increased component count and size, which in turn increases costs.
Innovation Solution
A developer amount detector with a simplified configuration using optical elements, light-guiding members, a holder, and a positioning mechanism that restricts movement orthogonal to the optical axes, ensuring accurate positioning of optical elements relative to the removably installable unit within the image forming apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rotary lever and big link mechanism are used to position the light-receiving element, then positioning accuracy is improved, but device complexity and size increase
Solution Approach 1:
The invention extracts and eliminates the complex rotary lever and big link mechanism from the positioning system. Instead, it uses a simple holder that is directly fixed to the image forming apparatus, with the light-receiving element simply placed in a positioning groove on the holder. This extraction of unnecessary complex components resolves the contradiction by maintaining positioning accuracy through simple geometric constraints rather than complex mechanical mechanisms.
Solution Approach 2:
The invention replaces the mechanical rotary lever and link mechanism with a static holder structure featuring a positioning groove. The positioning is achieved through the geometric constraint of the groove fitting the light-receiving element, eliminating the need for active mechanical positioning mechanisms. This substitution reduces device complexity while preserving positioning accuracy.
2Measurement precision
If a rotary lever and big link mechanism are used to position the light-receiving element, then positioning accuracy is improved, but device size increases
Solution Approach 1:
The invention removes the bulky rotary lever and link mechanism from the device. The holder is directly fixed to the image forming apparatus housing, eliminating the need for large positioning mechanisms. The light-receiving element is simply seated in a groove on the holder, requiring minimal space. This extraction dramatically reduces device size while maintaining positioning accuracy.
3Measurement precision
If optical elements are held in a fixed position, then detection accuracy is improved, but adaptability to unit installation variations is reduced
Solution Approach 1:
The holder is designed to be dynamically positionable within the image forming apparatus. It can be adjusted along the optical axis direction to accommodate different unit installations, while the positioning groove maintains the light-receiving element's position relative to the holder. This dynamic adjustability resolves the contradiction by allowing the holder to adapt to installation variations while the groove ensures consistent optical alignment.
Solution Approach 2:
The positioning system is segmented into two independent functions: the holder provides positional adjustment along the optical axis to accommodate installation variations, while the positioning groove on the holder provides precise lateral positioning of the light-receiving element. This segmentation allows each component to specialize in one aspect of positioning, achieving both adaptability and 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
This solution enhances detection accuracy while downsizing the image forming apparatus, reducing the number of components and costs by maintaining precise optical element positioning during unit installation.
Implementation Method 1
a light-emitting element to emit light and a light-receiving element to receive the light
Implementation Method 2
light-guiding members guide the light emitted from the light-emitting element to the light-receiving element
Implementation Method 3
a positioning mechanism to position the unit within the image forming apparatus by restricting movement of the holder in a direction orthogonal to the optical axes of the optical elements
Data Source
AI summary
A developer amount detector for detecting an amount of developer contained in a unit removably installable in an image forming apparatus, including optical elements having a light-emitting element to emit light and a light-receiving element to receive the light; two light-guiding members, provided in the unit, to guide the light from the light-emitting element to the light-receiving element; a holder, held in the image forming apparatus, to hold the optical elements, movable in a direction orthogonal to optical axes of the optical elements as the unit is being installed in the image forming apparatus; and a positioning mechanism to position the unit within the image forming apparatus by restricting movement of the holder in the direction orthogonal to the optical axes relative to the unit in a state in which the unit is installed in the image forming apparatus.