Mirror Plate Vibration Resistance in Image Scanners
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Solution Overview
Problem
Image reading apparatuses face challenges in reducing mirror plate shaking during sheet transportation, which can lead to accuracy issues and stray light generation, especially when vibration-resistant members protrude from the reflecting surface.
Innovation Solution
The apparatus incorporates vibration-resistant members, such as side reinforcing plates and back reinforcing plates, fixed to the mirror plate's sides and back, respectively, to absorb vibrations without protruding from the reflecting surface, ensuring the mirror plate's flatness and reducing shaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration-resistant member is disposed on the mirror plate to reduce shaking, then vibration resistance is improved, but the member may protrude from the reflecting surface causing stray light generation and flatness deterioration
Solution Approach 1:
The vibration-resistant member is designed with a non-protruding configuration that matches the contour of the reflecting surface. This local adaptation ensures that the member provides vibration resistance at its specific location without interfering with the optical path or generating stray light, thus resolving the contradiction between vibration resistance and stray light prevention.
2Reliability
If a vibration-resistant member is disposed on the mirror plate to reduce shaking, then vibration resistance is improved, but the flatness of the reflecting surface may deteriorate
Solution Approach 1:
The vibration-resistant member is configured to be non-protruding relative to the reflecting surface, adapting locally to the surface contour. This design provides vibration resistance at the member's location while maintaining the overall flatness of the reflecting surface, thus resolving the contradiction between vibration resistance and surface flatness.
Solution Approach 2:
The vibration-resistant member extends in the longitudinal direction of the mirror plate rather than protruding perpendicular to the reflecting surface. This dimensional reorientation allows the member to provide structural support and vibration resistance without compromising the flatness of the reflecting surface in the optical path direction.
3Reliability
If the mirror plate is held at both end portions to reduce shaking, then vibration resistance is improved, but the complexity of the holding structure increases
Solution Approach 1:
The holding structure is segmented into two separate holding portions located at both end portions of the mirror plate in the longitudinal direction. This segmentation provides effective vibration resistance by securing the plate at critical points while keeping each holding portion simple in design, thus resolving the contradiction between vibration resistance and structural complexity.
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 effectively reduces mirror plate shaking and maintains the flatness of the reflecting surface, preventing stray light generation and enhancing the accuracy of the image reading process.
Implementation Method 1
a vibration-resistant member, which imparts vibration resistance, is disposed on a part of some surfaces of the mirror plate other than the reflecting surface not to protrude from the reflecting surface
Data Source
AI summary
An image reading apparatus includes: a transport unit that transports a sheet including an image; and a reading unit that includes a mirror plate of which both end portions in a longitudinal direction are held, reflects reflected light, which is obtained by illuminating the sheet transported by the transport unit with light, by a reflecting surface of the mirror plate, and reads the image, in which a vibration-resistant member, which imparts vibration resistance, is disposed on a part of some surfaces of the mirror plate other than the reflecting surface not to protrude from the reflecting surface.