HUD Mirror Bezel Layout for External Light and Stray Reflection Control
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Solution Overview
Problem
Conventional head-up display apparatuses have a complex labyrinth structure due to shielding portions, making it difficult to dispose members like mirrors within the housing.
Innovation Solution
A head-up display apparatus with a first mirror configured to cross display light in an up-down direction and a light-shielding member attached to at least one of the mirrors to facilitate member placement and shield external light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding portions are provided in the case to block external light, then external light reflection is prevented, but the internal structure becomes a complicated labyrinth making it difficult to dispose members
Solution Approach 1:
The patent introduces a light-shielding wall that extends in the optical axis direction (depth dimension) from the reflection surface of the first mirror. This dimensional approach blocks external light from reaching the second mirror by creating a shielding barrier along the optical path, rather than using labyrinthine structures within the case. The light-shielding wall projects toward the second mirror along the optical axis, effectively blocking harmful light while maintaining a simple internal structure.
2Object-affected harmful factors
If shielding portions are provided in the case to block external light, then external light reflection is prevented, but member disposal becomes difficult
Solution Approach 1:
The light-shielding wall extends in the optical axis direction from the first mirror's reflection surface, creating an effective light barrier without complicating the internal arrangement of optical members. This dimensional shielding approach allows mirrors and other components to be positioned more freely while still preventing external light from reaching the second mirror.
3Object-affected harmful factors
If a light-shielding wall is attached to the first mirror, then external light is shielded effectively, but the structure becomes more complex
Solution Approach 1:
The light-shielding wall is integrated with the first mirror as a unified component. The wall is attached to the reflection surface of the first mirror, merging the light-shielding function with the existing mirror structure. This integration approach provides effective external light shielding while avoiding the complexity of separate, additional shielding components within the case.
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
Facilitates easy assembly of members in the housing while effectively shielding external light, allowing for a more compact design.
Implementation Method 1
a first mirror reflecting display light emitted from the display device
Implementation Method 2
a second mirror reflecting the display light being reflected by the first mirror
Implementation Method 3
an anti-reflection coating 527 is formed to reduce or prevent the reflection of any external light 525
Data Source
AI summary
A HUD apparatus includes a display device, a first mirror, a second mirror, a housing, a cover, an inner case, and a bezel with light-shielding wall. The bezel with light-shielding wall is attached to an upper end portion of the first mirror. The bezel with light-shielding wall shields any external light entering the housing from the opening portion and prevents the generation of any unexpected reflections on the windshield. Also, by attaching the first mirror to the bezel with light-shielding wall, the reflection range on the first mirror is suppressed to the minimum necessary, and the display light leaking out of the optical path for the virtual image display is not reflected by the first mirror such that it is possible to prevent the generation of any stray light.