Head-Up Display Driving Mirror Positioning Projection
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Solution Overview
Problem
In headup display devices, positional displacement of optical components leads to significant displacement of the virtual image display position, particularly due to torque-induced deformation of the base plate when adjusting the projection angle, resulting in inaccurate image positioning.
Innovation Solution
The headup display device incorporates a driving mirror with a base plate, upright support plates, a holder, and a positioning projection system, where the positioning projection is held by a holding recessed portion to suppress deformation and maintain the reflective mirror's angle accuracy, thereby stabilizing the virtual image display position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the holder is pivoted by the step motor to adjust the projection angle, then the irradiation direction of the display light can be changed, but torque generated during pivoting causes the base plate to deflect, resulting in angle shift and display position displacement
Solution Approach 1:
The base plate is divided into a fixed portion (screwed to the casing) and a movable portion (where the holder is pivotally supported). This segmentation allows the movable portion to deflect under torque while the fixed portion remains stable, preventing overall base plate deflection and maintaining display position accuracy during projection angle adjustment.
2Manufacturing precision
If the base plate is rigidly fixed to prevent deflection, then display position stability is improved, but the holder cannot be pivoted to adjust the projection angle
Solution Approach 1:
The base plate is segmented into fixed and movable portions, allowing the fixed portion to provide stability for display position while the movable portion enables holder pivoting for projection angle adjustment.
Solution Approach 2:
The base plate transitions from a completely rigid structure to a dynamic structure with a movable portion that can deflect under torque. This dynamic design allows the base plate to accommodate holder pivoting movements while maintaining overall stability through the fixed portion.
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 effectively suppresses the displacement of the virtual image display position, enhancing the positional accuracy of the reflective mirror and maintaining the stability of the projection angle, ensuring precise image superimposition on the windshield.
Implementation Method 1
a driving mirror configured to reflect a display light irradiated from an indicator to guide the reflected display light to a windshield of a vehicle
Data Source
AI summary
A headup display device includes a driving mirror configured to reflect a display light irradiated from an indicator to guide the reflected display light to a windshield of a vehicle. The driving mirror includes a base plate fixed to a bottom surface of a casing, a pair of opposite support plates which are upright on the base plate, a holder pivotally supported by the opposite support plates, a reflective mirror held by the holder, a driving motor configured to pivot the holder to change an angle of the reflective mirror, and a positioning projection provided on the support plate and protruding in a mounting direction of the base plate to the bottom surface of the casing. A holding recessed portion is formed on the casing to allow an insertion of the positioning projection therein and hold the positioning projection at a predetermined position.