Transparent Sheet Gap Structure for Fringe-Free Image Reading
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Solution Overview
Problem
Existing image reading apparatuses face issues with interference fringes caused by reflected light from the transparent sheet and glass plate surfaces, which can adversely affect image data quality, and using surface-treated transparent sheets increases costs.
Innovation Solution
The apparatus incorporates a transparent sheet bonded to the transparent plate member and guide members using adhesive layers to create a gap, preventing interference fringes without requiring special surface-treated sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent sheet with surface treatment is used to reduce surface reflection, then interference fringes are restrained, but manufacturing cost increases
Solution Approach 1:
A light-shielding member is introduced as an intermediary element positioned between the light source and the transparent sheet. This member selectively blocks oblique incident light that would cause interference fringes, while allowing perpendicular light to pass through for normal reading operations. This approach eliminates the need for expensive surface treatments on the transparent sheet itself.
Solution Approach 2:
The light-shielding member is positioned specifically at locations where oblique light reflection causes interference fringes, rather than treating the entire transparent sheet. This localized approach addresses the harmful reflection issue only where it occurs, maintaining transparency and readability in other areas while reducing overall manufacturing cost.
2Ease of operation
If a transparent sheet is disposed on the glass plate surface to cover steps and guide document sheets, then document sheet guidance is improved, but reflected light from both surfaces causes interference fringes
Solution Approach 1:
The light-shielding member serves as a mediator that blocks the harmful oblique reflected light from the transparent sheet while allowing the transparent sheet to remain in place for its document guidance function. This resolves the contradiction by adding an element that specifically addresses the interference issue without removing the beneficial guidance function.
3Object-affected harmful factors
If surface treatment is applied to the transparent sheet to reduce reflection, then interference fringes are reduced, but the transparent sheet becomes more complex and costly
Solution Approach 1:
The solution segments the problem by separating the functions of the transparent sheet (document guidance and light transmission) from the function of reducing interference fringes (achieved by the light-shielding member). This segmentation allows the transparent sheet to remain simple and unchanged, while the light-shielding member handles the reflection control independently.
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 interference fringes, maintaining image quality without the need for costly surface-treated transparent sheets, ensuring reliable image reading.
Implementation Method 1
reflected light by the surface of the glass plate and reflected light by the surface of the transparent sheet from causing interference fringes
Implementation Method 2
senses the amount of reflected light to read an image on the document sheet
Data Source
AI summary
A downstream-side guide member is disposed along a region located further downstream with respect to a downstream adjacent region adjacent to a reading region on a first surface of a transparent plate member on the downstream side. An upstream-side adhesive layer is formed in an upstream adjacent region adjacent to the reading region on an upstream side. Downstream-side adhesive layers are formed in the downstream adjacent region and on a surface of the downstream-side guide member. A transparent sheet is bonded to the first surface of the transparent plate member and the surface of the downstream-side guide member by the upstream-side adhesive layer and the downstream-side adhesive layers. The upstream-side adhesive layer and the downstream-side adhesive layers form a gap between the reading region on the transparent plate member and the transparent sheet.