Virtual Image Display Signal Routing via Hinge
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Solution Overview
Problem
Existing virtual image display systems cause discomfort due to cables hitting the face when worn, leading to usability issues.
Innovation Solution
A virtual image display system design featuring a housing member with a hinge mechanism that routes the signal line from the housing space into the temple via a hinge mechanism, allowing the signal line to be bent and housed within the temple, preventing cable discomfort and enabling see-through functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cable is directly connected to the image display unit fixed in the temple, then the connection is simple and reliable, but the cable hits the face of the observer and causes discomfort
Solution Approach 1:
The signal line is routed through the hinge mechanism, transitioning from a direct linear connection to a three-dimensional path that goes through the temporal region. This spatial reconfiguration allows the cable to exit from the rear side rather than the front, eliminating facial contact while maintaining electrical connection integrity
Solution Approach 2:
The hinge mechanism serves as an intermediary structure that the signal line passes through. This mediator component provides a protected pathway for the cable, routing it through the temporal region away from the face while maintaining connection between the image display unit and external devices
2Ease of operation
If the signal line is routed through the hinge mechanism, then the cable discomfort is eliminated, but the routing path becomes more complex
Solution Approach 1:
The hinge mechanism performs dual functions: it provides the mechanical articulation for the temple while simultaneously serving as a routing pathway for the signal line. This multi-functionality eliminates the need for separate cable management structures, reducing overall device complexity despite the improved routing path
3Reliability
If the signal line is bent and housed in the first space, then the risk of disconnection is reduced, but the housing space must accommodate the bent cable
Solution Approach 1:
The bent signal line is nested within the housing space, with the cable folded back on itself in a U-shape configuration. This nesting approach allows the cable to occupy minimal additional volume while maintaining the necessary bends for stress relief and connection reliability
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 improves usability by preventing cable discomfort and allowing for see-through virtual image display, while also reducing the risk of signal line disconnection and enabling a more compact design.
Implementation Method 1
a temple rotatably attached to the housing member via a hinge mechanism
Implementation Method 2
The entrance mirror reflects the image light output from the display device and projected by the projection lens as parallel light so that the image light may be totally reflected within the light guide plate
Data Source
AI summary
A virtual image display system includes a display device outputting image light, a circuit substrate driving the display device based on an image signal, a signal line connected to the circuit substrate and inputting the external image signal to the circuit substrate, a projection optical device projecting the image light from the display device, a light guide plate taking in the projected image light, and then, guiding the light to an external predetermined position, a housing member having a housing space housing respective members, and a first space communicated with the housing space and housing a part of the signal line inside, and a temple rotatably attached to the housing member via a hinge mechanism and having a second space communicated with the first space via the hinge mechanism inside. The signal line is routed from the first space into the second space via the hinge mechanism.