Autograph Support Device Half-Mirror Shadow Elimination
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Solution Overview
Problem
Existing autograph support devices face issues with visibility due to user shadows and poor recognition of the writing surface, leading to a degradation of the autograph support function.
Innovation Solution
An autograph support device with a supporting member and a half mirror, where the image display surface and writing surface are at equal optical distances from the mirror, and a writing surface lighting fixture is used to illuminate the writing surface, allowing the user to recognize a reflection image without shadows, with adjustable luminance control to enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a projector is used to project model characters onto paper, then characters can be traced to write well-balanced beautiful characters, but the projected characters are not easily seen due to the shadow of a user's hand
Solution Approach 1:
The patent transitions from a 2D projected image on the paper surface to a 3D virtual image formed by the half-mirror system. The image display surface is positioned above the writing surface, and through the half-mirror, users perceive a virtual image that appears to float above the paper, eliminating shadow interference while maintaining visual guidance.
Solution Approach 2:
The half-mirror acts as an intermediary optical element between the image display surface and the user's eyes. It reflects light from the image display surface to create a virtual image, while simultaneously allowing light from the writing surface to pass through, thus mediating between the guidance image and the writing area without causing shadow interference.
2Object-affected harmful factors
If a half-mirror is used to display a mirror image above the writing surface, then user shadow interference is eliminated, but the visibility of both the reflection image and writing surface may be poor
Solution Approach 1:
The patent segments the lighting function into two distinct lighting fixtures: one for illuminating the image display surface and another for illuminating the writing surface. This segmentation allows independent optimization of lighting for each surface, ensuring both the virtual image and the writing area have sufficient visibility without interfering with each other.
Solution Approach 2:
The patent applies different lighting conditions to different regions: the image display surface receives lighting optimized for visibility of the guide characters, while the writing surface receives lighting optimized for writing comfort. This local quality differentiation ensures both areas are clearly visible despite the half-mirror configuration.
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
Prevents degradation of the autograph support function by ensuring excellent visibility and recognition of both the reflection and transmission images, thereby enabling effective handwriting support without shadows.
Implementation Method 1
a mirror image of an image displayed on a planar writing surface is reflected by a half mirror
Implementation Method 2
A writing surface lighting fixture that radiates light from the mirror surface side toward the writing surface side to illuminate the writing surface
Data Source
AI summary
An 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 of an image displayed on a planar writing surface is located above the writing surface of a writing medium having the planar writing surface; and a half mirror that is disposed between the writing surface and the image display surface and has a mirror surface facing the image display surface . The image display surface and the writing surface are disposed at an equal optical distance from the mirror surface of the half mirror interposed therebetween. A writing surface lighting fixture that radiates light from the mirror surface side toward the writing surface side to illuminate the writing surface is provided on the writing surface side from the mirror surface.