Dynamic Damper for Head-Up Display Screen Vibration Control
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Solution Overview
Problem
Head-up displays in vehicles experience vibration issues due to high-speed movement of the screen, leading to resonance and noise generation, which are not effectively addressed by existing damping systems that apply reaction forces to the support base.
Innovation Solution
Integration of a dynamic damper on a non-movable part of the support base to absorb vibration energy, inhibiting movement and reaction forces, thereby suppressing vibration and resonance in other components like the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the screen is moved at high speed to enable depth perception, then the driver can view images spreading in the depth direction, but vibration occurs and resonance sound is generated
Solution Approach 1:
A damper is introduced between the support base and the fixed base to absorb vibration before it propagates to the casing. This preventive measure cushions the harmful vibrations generated during high-speed screen movement, allowing depth perception functionality while suppressing resonance sound.
Solution Approach 2:
The damper acts as an intermediary element between the moving support base and the fixed base. It mediates the transmission of vibration energy, converting mechanical vibration into heat energy through damping, thereby preventing direct transmission of resonance-causing vibrations to the casing.
2Object-affected harmful factors
If a damper is used to absorb vibration from the support base, then vibration propagation to the fixed base is reduced, but reaction force still vibrates the casing
Solution Approach 1:
The harmful reaction force is extracted and isolated from the casing by introducing the damper as a separate vibration-absorbing component. The damper captures and dissipates the reaction force energy, preventing it from being transmitted to and vibrating the casing structure.
3Adaptability or versatility
If the screen position is changed in the optical axis direction, then the image-formation position changes for depth display, but the structure vibrates due to reaction force
Solution Approach 1:
The damper is pre-installed between the support base and fixed base to provide cushioning before vibration occurs. When the screen position is adjusted in the optical axis direction for depth display, the damper absorbs the resulting reaction forces, maintaining structural stability while enabling position changes.
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
Effectively reduces vibration and resonance in the image display apparatus, enhancing the stability and clarity of the virtual images displayed for the driver by targeting specific frequency bands with adjustable dynamic dampers.
Implementation Method 1
vibration energy of a structure obtained by integrating the actuator and the support base is absorbed by the dynamic damper
Implementation Method 2
movement of the structure is suppressed in the target frequency band of the dynamic damper, so that reaction from the structure is inhibited from being applied to another member such as a casing
Data Source
AI summary
An image display apparatus includes: a light source; a screen on which an image is formed when light from the light source is applied thereto; an optical system configured to generate a virtual image by light from the screen; an actuator configured to move the screen in an optical axis direction; a support base supporting the actuator; and a dynamic damper installed on a non-movable part on the support base.