Stereoscopic Sheet with Variable Perspective Viewing Angle
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Solution Overview
Problem
Existing stereoscopic sheets face limitations in achieving high-quality, dynamic visual effects due to limitations in recognition within a 'near-sighted' distance, image quality, and thickness, as well as challenges in manufacturing high-gloss products with convex lenses that cause diffused reflection and Moire image formation.
Innovation Solution
A stereoscopic sheet with convex lenses arrayed at regular intervals and a printed layer at a focal distance, where the focal distance is at least 3.5 times longer than the pitch of the lenses, and the repetition gap of printed patterns is 80% to 98% less than the parallax gap at the minimum proximity distance, allowing for dynamic image changes and thin-layered manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If convex lenses are arrayed to form stereoscopic sheets, then three-dimensional visual effects are achieved, but the sheet surface becomes dull and matte due to diffused reflection
Solution Approach 1:
A flat transparent resin layer is introduced as an intermediary between the convex lenses and the external environment. This resin layer has a refractive index matched to the lenses, eliminating diffused reflection at the lens surfaces while maintaining the three-dimensional visual effects. The resin layer acts as a mediator that preserves optical performance without the harmful matte surface effect.
2Manufacturing precision
If focal distance is increased to improve image quality, then recognition within near-sighted distance is achieved, but sheet thickness increases
Solution Approach 1:
The refractive index of the transparent resin layer is specifically optimized to be substantially the same as that of the convex lenses. This parameter matching allows light to pass through the resin-lens interface without refraction or reflection losses, enabling high-quality image formation at reduced focal distances. By changing the refractive index parameter, the system achieves both thin-sheet construction and near-sighted distance recognition.
3Productivity
If printed patterns are arrayed at regular intervals, then Moire images are formed three-dimensionally, but image quality deteriorates
Solution Approach 1:
The flat transparent resin layer serves as an intermediary that optically couples the printed patterns with the convex lenses. By matching the refractive index, it eliminates spurious reflections and diffusions that would otherwise degrade the Moire image quality. The resin layer preserves the three-dimensional Moire effect while significantly improving overall image clarity and contrast.
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
The solution enables a variable perspective view angle, thin-layered stereoscopic sheet with enhanced three-dimensional decorative effects, allowing recognition of images within a 'near-sighted' distance and dynamic changes in design, suitable for various applications including furniture and electronic product surfaces.
Implementation Method 1
show an active visual image according to refraction of light and a change in vision route using the imaging principle of the eye by a convex lens
Implementation Method 2
a Moire image is formed three-dimensionally according to the array density of the printed patterns
Data Source
AI summary
A stereoscopic sheet having a variable perspective viewing angle and a thin-layered stereoscopic sheet having a three-dimensional decorative effect. The portions of the sheet, viewed three-dimensionally, create dynamic changes according to the perspective distance. The stereoscopic sheet includes convex lenses arrayed on the top surface of the stereoscopic sheet to intersect at regular intervals. A printed layer is formed at the focal distance of the convex lenses. The focal distance of the convex lenses is formed to be approximately 3.5 times longer than the pitch. A repetition gap of a printed pattern formed on a portion of a printed area is determined as a pattern gap to allow the impression of depth or protrusion to be sensed at a short-sighted distance. The repetition gap of the printed pattern is less than a parallax gap at a minimum proximity distance within the short-sighted distance by approximately 80%-98%.