Motorcycle Head-Up Display With Concave Mirror Single-Eye Image
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Solution Overview
Problem
Vehicles with handlebars, such as motorcycles or scooters, face constraints in space and rider positioning, making it difficult to safely view vehicle control information without diverting the rider's gaze, which affects alertness and causes eye fatigue.
Innovation Solution
A head-up display device with a partially reflective, concave support and an emission unit positioned to reflect light beams onto a concave mirror, forming a single virtual image in the rider's field of vision, allowing information to be viewed without diverting gaze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a control panel is installed at the handlebars to display vehicle control information, then the rider can access useful driving information, but the rider must divert their gaze from the road, reducing alertness and increasing eye fatigue
Solution Approach 1:
The patent introduces a head-up display system that acts as an intermediary between the control information and the rider's field of vision. The support with concave mirror reflects light beams from the emission unit to form a virtual image of control information directly in the rider's field of vision, allowing the rider to view information without diverting their gaze from the road ahead.
Solution Approach 2:
The patent transitions the display from a two-dimensional control panel at the handlebars to a virtual image projected in three-dimensional space within the rider's field of vision. The support positioned opposite the upper part of the rider's body creates a virtual image that appears to float in the rider's line of sight, eliminating the need for gaze diversion.
2Reliability
If a head-up display is used to project information in the rider's field of vision, then the rider can view information without diverting gaze, but the available space and rider positioning constraints in vehicles with handlebars make conventional head-up displays incompatible
Solution Approach 1:
The patent applies local quality by making only a portion of the support (the useful portion) partially reflective with a specific concave curvature, while other portions may have different properties. The useful portion is specifically positioned and shaped to reflect light beams from the emission unit to form a virtual image in the rider's field of vision, adapting to the limited space and positioning constraints of handlebar vehicles.
Solution Approach 2:
The patent employs curvature by designing the useful portion of the support with a concave mirror geometry. This curved surface is essential for reflecting divergent light beams from the emission unit to form a focused virtual image in the rider's field of vision, enabling the head-up display function within the constrained space of handlebar vehicles.
3Loss of information
If the support has a concave curvature to form a virtual image, then information can be displayed in the field of vision, but the positioning and orientation must precisely satisfy optical constraints to ensure the virtual image is the same for both eyes
Solution Approach 1:
The patent utilizes parameter changes by carefully controlling the optical parameters of the system - the curvature radius of the concave mirror, the distance between the emission unit and the support, and the inclination angles. These parameters are optimized to ensure that light beams reflected from the useful portion form a virtual image that appears at the same location for both the rider's left and right eyes, eliminating double imaging.
Solution Approach 2:
The patent achieves equipotentiality in the optical path by positioning the emission unit and configuring the concave mirror such that light beams reaching the rider's left eye and right eye travel equivalent optical paths. This ensures that the virtual image appears at the same position for both eyes, creating a unified, stable image without lateral displacement or double imaging.
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
Enables safer viewing of vehicle control information by maintaining rider alertness and reducing eye fatigue through a single virtual image display, compatible with the space and positioning constraints of vehicles with handlebars.
Implementation Method 1
the light beam emitted by the emission unit is reflected onto the useful portion of the support so as to form a virtual image in the field of vision of the rider
Implementation Method 2
at least a portion of the support, called the useful portion, being partially reflective and having a non-zero curvature so as to form a concave mirror on the rider's side
Data Source
AI summary
The present invention relates to a head-up display device (12) for a vehicle (10) with a handlebar (14), comprising:a. a support (20), at least a portion of the support (20), called the useful portion (24), being partially reflective and having a non-zero curvature so as to form a concave mirror on the rider's side (16),b. an emission unit for vehicle control information (10), the emission unit and the support (20) being positioned in the display device according to positioning constraints, the positioning constraints being such that:1. the light beam emitted by the emission unit is reflected onto the useful portion (24) of the support (20) so as to form a virtual image in the field of vision of the rider (16) in the driving position, and2. the virtual image formed is the same image for the right eye and the left eye of the rider (16).