Virtual Image Display with Adjustable Temple Hinges
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Solution Overview
Problem
Existing virtual image displays face challenges in accommodating observers with different head sizes due to fixed temple positions, leading to difficulties in maintaining optimal optical alignment and user convenience.
Innovation Solution
A virtual image display design featuring rotatable temples with adjustable hinge mechanisms and contact members, allowing for customizable opening angles and pressing force, ensuring proper alignment and comfort for various head sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If temples are fixed to the front of the spectacle frame, then the structure is simple, but the device cannot accommodate observers with different head sizes
Solution Approach 1:
The temples are made rotatable relative to the front of the spectacle frame through hinge mechanisms, allowing dynamic adjustment of the opening angle to accommodate different head sizes. This transforms the static fixed structure into a dynamic adjustable one, resolving the contradiction between simplicity and adaptability.
2Adaptability or versatility
If the image display unit is fixed to the temple, then the structure is simple, but the positional relationship between the projection lens and light guide member changes when the temple rotates
Solution Approach 1:
The image display unit is separated from the temple and fixed to the light guide member instead. This segmentation ensures that when the temple rotates for adjustment, the image display unit remains stationary relative to the light guide member, maintaining optical alignment precision while allowing temple angle adaptability.
3Adaptability or versatility
If temples are made rotatable to accommodate different head sizes, then adaptability improves, but the control of temple rotation becomes complex
Solution Approach 1:
The hinge mechanism is designed to allow the temples to be rotated and adjusted by the user themselves without requiring complex control systems or additional actuators. The self-service adjustment mechanism simplifies the overall device complexity while maintaining adaptability for various observers.
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 design enhances user convenience by allowing flexible temple adjustment, maintaining optimal optical alignment, and improving the fit and comfort of the virtual image display for observers with different head sizes.
Implementation Method 1
The introduction mirror receives image light emitted from the display element and projected through the projection lens as collimated light, and reflects the image light such that the image light can be guided toward the combiner by total reflection on the introduction mirror within the light guide member.
Implementation Method 2
The combiner reflects the image light received by the total reflection within the light guide member such that the image light can reach a predetermined position outside the light guide member (left or right eye of the observer).
Data Source
AI summary
A virtual image display includes at least an image forming device, a pair of accommodating members at least one of which accommodates the image forming device, a light guide member which guides image light received from the image forming device toward a predetermined outside position, and a pair of temples one and the other of which are rotatably attached to one and the other of the pair of the accommodating members, respectively. Each of either the accommodating members or the temples has a contact member which regulates rotation of the temple, and a position control member which shifts the corresponding contact member in a first direction extending nearer to or away from the corresponding accommodating member or temple on which the contact member is not provided.