Light Guide Unit Frame Center Portion Alignment
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Solution Overview
Problem
Existing virtual image display apparatuses face challenges in maintaining accurate alignment between left and right display units while reducing weight and size, leading to potential image display misalignment that can disrupt binocular vision.
Innovation Solution
A virtual image display apparatus featuring first and second light guide units connected by a frame part with a center portion having a thick structure, which fixes the relative positions of the light guide units, allowing for reduced weight and size while maintaining assembly strength and suppressing image display misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the metal frame is designed with sufficient strength and accuracy to maintain proper alignment between left and right display apparatuses, then image display misalignment is suppressed, but the weight and size of the frame part increase
Solution Approach 1:
The frame is divided into a lightweight peripheral portion and a separate center portion with thick structure. The center portion is provided separately to connect to both light guide units and fix their relative positions, while the peripheral portion can be made lightweight. This segmentation allows the frame to achieve both precision and reduced weight.
Solution Approach 2:
The center portion acts as an intermediary component between the left and right light guide units. It provides the necessary connection and positioning function without requiring the entire frame to be heavy, thus resolving the contradiction between alignment accuracy and frame weight.
2Manufacturing precision
If the metal frame is designed with sufficient strength and accuracy to maintain proper alignment between left and right display apparatuses, then image display misalignment is suppressed, but the size of the frame part increases
Solution Approach 1:
The frame is segmented into a peripheral portion and a center portion. The center portion with thick structure is provided separately to connect to both light guide units and fix their relative positions, while the peripheral portion can be minimized in size. This segmentation allows the frame to achieve both precision and reduced size.
Solution Approach 2:
The center portion serves as an intermediary that provides the necessary connection and positioning function between light guide units without requiring the entire frame to be large, thus resolving the contradiction between alignment accuracy and frame size.
3Weight of moving object
If the frame part is made lightweight and small in size, then the weight and size of the apparatus are reduced, but the strength and accuracy to maintain alignment between left and right display apparatuses deteriorate
Solution Approach 1:
The frame is divided into a lightweight peripheral portion and a separate center portion with thick structure. The center portion provides the necessary connection strength to both light guide units, ensuring assembly strength is maintained while the peripheral portion can be made lightweight.
Solution Approach 2:
The center portion is provided with a thick structure locally at the position where connection to light guide units is needed, while other parts of the frame can be made lightweight. This local quality enhancement resolves the contradiction between overall weight reduction and local strength requirements.
4Weight of moving object
If the frame part is made lightweight and small in size, then the weight and size of the apparatus are reduced, but the accuracy to maintain alignment between left and right display apparatuses deteriorates
Solution Approach 1:
The frame is segmented into a peripheral portion and a center portion with thick structure. The center portion is specifically designed to connect to both light guide units and fix their relative positions with high precision, while the peripheral portion can be made lightweight.
Solution Approach 2:
The center portion acts as an intermediary that provides precise positioning and connection between light guide units. This intermediary structure ensures alignment accuracy is maintained while the overall frame can be made lightweight.
Data Source
AI summary
In a frame part, a center portion having a thick structure is provided between a first optical member as a first light guide unit and a second optical member as a second light guide unit to connect to both and fixes relative positions of the first optical member and the second optical member by the center portion, and thereby, reduction in weight and size of the frame part is realized.