Saddle Vehicle HUD Meter Overlap Optical Path
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Solution Overview
Problem
Existing head-up display apparatuses for two-wheeled motor vehicles face challenges in reducing space requirements while maintaining a sufficient optical path length between the projection unit and the combiner, often leading to increased size of the meter housing or headlamp cowl.
Innovation Solution
The head-up display unit is designed with the meter apparatus positioned to overlap the optical path between the projection unit and the combiner, allowing for a reduced arrangement space and securing a sufficient optical path length, with the projection unit coupled to the lower portion of the meter apparatus for waterproof and dustproof functions, and the combiner arranged higher than the meter apparatus for improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the projection unit and combiner are disposed in front of or in the rear of the meter apparatus, then the arrangement space is reduced, but the optical path length between the projection unit and combiner is insufficient
Solution Approach 1:
The patent transitions from a linear front-rear arrangement to a three-dimensional overlapping configuration where the meter apparatus is positioned at a position overlapping with the optical path from the projection unit to the combiner as viewed in plan view. This spatial reconfiguration allows the optical path to pass through or alongside the meter apparatus, simultaneously reducing the overall arrangement space while maintaining sufficient optical path length for accurate virtual image projection.
2Area of stationary object
If the distance from the projection unit to the combiner is reduced to avoid increase in size of meter housing or headlamp cowl, then the size of the virtual image is reduced
Solution Approach 1:
The patent employs three-dimensional spatial arrangement where the meter apparatus overlaps with the optical path in plan view, allowing the optical path length to be maintained independently of the front-rear dimensions of the meter housing. This enables the virtual image size to be preserved while keeping the meter housing compact, as the optical path extends in a different spatial configuration rather than linearly along the front-rear axis.
3Reliability
If the meter apparatus covers the projection unit from above, then waterproof and dustproof functions are achieved, but the projection unit requires precise positioning to maintain optical accuracy
Solution Approach 1:
The patent integrates the projection unit with the meter apparatus by coupling the projection unit to the lower portion of the meter apparatus such that at least part of the projection unit overlaps with the meter apparatus as viewed in plan view. This merging creates a unified assembly where the meter apparatus housing provides inherent positional stability and environmental protection, while the integrated design ensures that the optical components maintain precise relative positioning for accurate virtual image projection.
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 reduces the overall size of the head-up display unit, enhances its assembly simplicity and strength, and maintains accurate projection while avoiding increased size and improving visibility of the virtual image.
Implementation Method 1
a projection unit (45) attached to a lower side of the meter apparatus (44) for a saddle riding vehicle having an upward or downward direction in response to a direction of a numeral written thereon and displaying a projection image
Implementation Method 2
a combiner (46) attached to an upper side of the meter apparatus (44) for a saddle riding vehicle and generating a virtual image on the basis of the projection image
Data Source
Figure 1
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Figure 3
AI summary
A saddle riding vehicle includes: a meter apparatus (41); and a head-up display apparatus including a projection unit and a combiner to which an image from the projection unit is projected. The meter apparatus (41) is arranged at a position overlapping with an optical path from the projection unit to the combiner as viewed in plan view.