Dual Light Source Contact Scanner for Stuck Original Shade
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Solution Overview
Problem
Contact optical systems in image scanning and forming apparatuses face challenges with power consumption and significant original shade formation when scanning stuck originals, particularly due to the lack of a mirror and increased influence of oblique light sources.
Innovation Solution
Incorporating a contact-type sensor with a first light source irradiating light obliquely below the original and a second light source positioned opposite to the first, which is only activated when a stuck original is detected to minimize power consumption and prevent original shade formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a contact optical system uses one light source to irradiate the original from obliquely below, then the physical size is small, but original shade occurs on stuck originals
Solution Approach 1:
The single light source is segmented into two separate light sources positioned at different locations. The first light source irradiates from one side of the sensor and the second light source irradiates from the opposite side, allowing each light source to handle specific scanning regions and eliminate original shade while maintaining compact size.
Solution Approach 2:
The lighting approach transitions from a single oblique angle to dual oblique angles from opposite directions. By adding the dimensional aspect of opposite positioning across the sensor, the system eliminates the original shade problem while keeping the contact optical system's compact form factor.
2Object-generated harmful factors
If two light sources are used to irradiate the original from left and right directions, then original shade is prevented, but power consumption increases
Solution Approach 1:
The lighting system dynamically switches between single and dual light source modes based on detection results. After preliminary scanning with one light source, if original shade is detected, the system activates the second light source for re-scanning, optimizing power consumption while ensuring original shade prevention when needed.
Solution Approach 2:
The scanning process uses periodic action by performing preliminary scanning with the first light source, detecting original shade, and then conditionally performing re-scanning with both light sources. This periodic approach ensures original shade prevention while minimizing unnecessary power consumption from continuous dual-light operation.
3Use of energy by moving object
If preliminary scanning is performed with one light source, then power consumption is reduced, but original shade may occur and require re-scanning
Solution Approach 1:
The system performs preliminary scanning with the first light source before the main scanning process. This preliminary action detects the presence of original shade, allowing the system to prepare for re-scanning with both light sources if needed, thereby optimizing both power consumption and scanning time by avoiding unnecessary dual-light operation.
Solution Approach 2:
The system uses feedback from the preliminary scanning results to control the main scanning process. If original shade is detected in the preliminary scan, the system activates the second light source and performs re-scanning. This feedback mechanism ensures that the additional scanning time is only incurred when actually needed, balancing power consumption and scanning efficiency.
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 configuration reduces power consumption while effectively preventing original shade formation in stuck originals by using dual light sources strategically, ensuring clear image scanning without unnecessary power usage.
Implementation Method 1
an image scanning apparatus which includes: a contact-type sensor unit which has a sensor disposed under an original stand, on which an original is placed, to be in close contact with the original stand; a first light source which irradiates light on a scanning area of the original from a direction obliquely below the original
Data Source
AI summary
An image forming apparatus according to the invention includes: a sensor disposed under an original stand, on which an original is placed, to be in close contact with the original stand; a first light source that irradiates light on a scanning area of the original from a direction obliquely below the original; and a second light source that is disposed in a position opposite to the first light source across the sensor and irradiates light from a direction obliquely below the original opposite to a direction of the light irradiated from the first light source. When the original is not a stuck original, the first light is turned on and, when the original is a stuck original, the first light source and the second light source are turned on. According to the image forming apparatus according to the invention, it is possible to reduce power consumption while preventing occurrence of an original shade of a stuck original in a contact-type optical system.