Autograph Support Device Half Mirror Shadow Interference
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Solution Overview
Problem
Existing autograph support devices using projectors face issues with the writer's shadow obstructing the projected characters, leading to a decrease in support functionality.
Innovation Solution
An autograph support device with a half mirror arranged between the writing surface and an image display surface, ensuring both surfaces are at equal optical distances from the mirror, allowing partial reflection and transmission of light to minimize shadow interference, and utilizing a supporting member to position the image display surface above the writing surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a projector is used to project model characters onto paper for handwriting support, then the support function for writing well-balanced characters is improved, but the writer's shadow obstructs the projected characters and decreases the support function
Solution Approach 1:
The invention transitions from a 2D projection system to a 3D optical system by positioning the image display surface above the writing surface at a specific height. This vertical dimension allows light to travel from the image display surface, reflect off the half mirror, and reach the writing surface without being blocked by the writer's shadow, thereby resolving the contradiction between projection visibility and shadow interference
Solution Approach 2:
The half mirror serves as an intermediary optical element that redirects light from the image display surface to the writing surface. By positioning the half mirror between the image display surface and the writing surface, it mediates the light path to achieve image projection while minimizing shadow interference from the writer's hand
2Object-affected harmful factors
If the image display surface is positioned above the writing surface with a half mirror, then shadow interference is reduced and image visibility is improved, but the device complexity increases due to additional components
Solution Approach 1:
The half mirror performs multiple functions: it reflects light from the image display surface to the writing surface, allows light transmission for visibility, and positions the image at the correct optical distance. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving shadow reduction and image visibility improvement
3Loss of information
If the image display surface and writing surface are arranged at equal optical distances with a half mirror, then the mirror-image image is clearly visualized without shadow interference, but the arrangement precision requirements increase
Solution Approach 1:
The invention creates an equipotential optical arrangement by positioning the image display surface and writing surface at equal optical distances from the half mirror. This symmetric arrangement ensures that light paths from the image display surface to the writing surface are optimized for clear image visualization while maintaining manufacturing feasibility through standardized positioning
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
Enables clear visualization of the mirror-image image on the writing surface without shadow interference, maintaining support functionality while allowing for well-balanced and ordered handwriting.
Implementation Method 1
a half mirror that is arranged between the writing surface and the image display surface to reflect at least a portion of light from above and allow a portion of the light to be transmitted therethrough
Data Source
AI summary
The autograph support device includes a supporting member that supports an image carrier having a planar image display surface such that the image display surface that displays a mirror-image image of an image displayed on a planar writing surface is located one side of the normal direction of the writing surface of a writing medium having the writing surface, and a half mirror that is arranged between the writing surface and the image display surface to reflect at least a portion of light from the one side of the nomal direction of the writing surface above and allow a portion of the light to be transmitted therethrough, and the image display surface and the writing surface are arranged at an equal optical distance with a planar mirror surface of the half mirror interposed therebetween.