Rib Structure Supporting Portion for Optical Device Weight Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical devices used in image display apparatuses face challenges in reducing weight while maintaining rigidity, which is essential for achieving high resolution and efficient image projection.
Innovation Solution
The optical device incorporates a rib structure in its supporting portion, formed by connecting ribs, which allows for increased thickness to enhance rigidity without significantly increasing weight, and is made from synthetic resin materials for improved moldability and mass-production capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the supporting portion is increased to ensure rigidity, then rigidity is improved, but weight increases
Solution Approach 1:
The supporting portion is segmented into multiple ribs connected together, forming a rib structure. This segmentation allows the structure to achieve high rigidity through geometric arrangement while using less material, thereby reducing weight compared to a solid block of the same thickness.
Solution Approach 2:
The supporting portion transitions from a two-dimensional planar structure to a three-dimensional rib structure with vertical elements. This dimensional change provides structural reinforcement and rigidity without proportionally increasing the planar area or material volume, thus reducing weight.
2Strength
If the supporting portion is made as a rigid body to ensure rigidity, then rigidity is improved, but weight increases
Solution Approach 1:
Instead of making the entire supporting portion uniformly rigid, the rib structure provides localized reinforcement at critical areas. The ribs are strategically positioned to offer structural support where needed while leaving other areas lighter, achieving overall rigidity with reduced weight.
3Strength
If the distance between ribs is decreased to improve rigidity in the shaft portion support region, then rigidity is improved, but manufacturing complexity increases
Solution Approach 1:
The distance between ribs is decreased specifically in the region where the shaft portion is supported, while maintaining larger distances between ribs in other regions. This localized variation in rib spacing provides enhanced rigidity at critical locations without unnecessarily increasing manufacturing complexity across the entire structure.
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 enables the optical device to achieve weight reduction while ensuring rigidity, improving the resolution and display characteristics of the image display apparatus by shifting the optical axis of light through refraction, thus enhancing the projected image quality.
Implementation Method 1
The optical device deflects an optical path of image light which is emitted from the light modulation device by rotating (swinging) an optical portion
Data Source
AI summary
An optical device includes: an optical portion that has a light incident face onto which light is incident; a movable portion that is swingable while supporting the optical portion; a shaft portion that supports the movable portion so as to swing the movable portion around a swing axis; and a supporting portion that supports the shaft portion. The supporting portion has a rib structure which is formed by connecting ribs. The rib structure is provided on a single surface of the supporting portion.