Image Reading Apparatus Synchronized Carriage Light Source Switching
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Solution Overview
Problem
Existing image reading apparatuses face challenges in accurately reading translucent originals due to increased complexity and potential for distortion or color shading caused by multiple moving mechanisms, and struggle to switch light sources effectively between different types of films like negative and positive film without a specific lamp switching mechanism.
Innovation Solution
The apparatus employs a simplified structure where a first carriage with a line sensor and a second carriage with multiple light-source lamps move in synchronization, eliminating the need for a specific lamp switching mechanism by controlling the movement of both carriages to position the appropriate light source for the type of original, ensuring accurate light application and reduced light fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lamp holder with multiple light-source lamps is provided inside the light-source carriage to enable switching, then light-source switching capability is improved, but device complexity increases due to multiple moving mechanisms
Solution Approach 1:
The patent extracts the lamp holder from the light-source carriage, making it a separate fixed component. The light-source carriage only carries a single light-source lamp, eliminating the complex internal switching mechanism while maintaining the ability to switch light sources by replacing the lamp holder entirely.
Solution Approach 2:
The system is segmented into three independent components: the fixed lamp holder containing multiple light-source lamps, the movable light-source carriage carrying one lamp at a time, and the reading carriage. This segmentation allows simple movement of the carriage to achieve light-source switching without complex internal mechanisms.
2Adaptability or versatility
If multiple moving mechanisms are provided for carriage and lamp holder movement, then light-source switching is enabled, but manufacturing precision deteriorates due to potential displacement and rattling
Solution Approach 1:
By extracting the lamp holder from the movable carriage structure and making it fixed, the patent eliminates the cumulative displacement errors that would occur with multiple moving mechanisms. The lamp holder remains stationary, providing a stable reference point that prevents image distortion and color shading.
3Adaptability or versatility
If a complex lamp switching mechanism is implemented, then light-source switching capability is improved, but ease of operation deteriorates due to potential misalignment and characteristic shifts
Solution Approach 1:
The system uses the movement of the light-source carriage itself to achieve both positioning and light-source selection. As the carriage moves to different positions, it automatically selects different light-source lamps without requiring separate switching mechanisms, thereby maintaining alignment accuracy and operational simplicity.
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 approach allows for high-speed processing of selecting the original type, setting the light source, and reading images with improved color reproducibility, reducing the risk of distortion and maintaining image quality over time.
Implementation Method 1
a line sensor that performs photoelectric conversion on light from the original on the platen
Implementation Method 2
a second carriage provided with a plurality of rod-shaped light-source lamps that applies light to the original
Data Source
AI summary
There are provided a platen on which an original is mounted, a line sensor that performs photoelectric conversion on light from the original on the platen, a first carriage that moves along the platen and guides the light from the original to the line sensor, a first housing that stores and supports the first carriage to be movable along the platen, first driving means for moving the first carriage, a second carriage provided with a plurality of rod-shaped light-source lamps that applies light to the original, a second housing that stores and supports the second carriage to be movable along the platen and covers the platen, second driving means for moving the second carriage, and control means for controlling the first driving means, the second driving means and lighting of the plurality of light-source lamps.