Head-Up Display Mirror Drive With Multi-Stage Vibration Damping
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Solution Overview
Problem
Conventional head-up displays experience vibration issues due to motor noise and wear caused by concentrated external forces, leading to geometric transformation and reduced aspheric mirror durability.
Innovation Solution
A head-up display driving module incorporating a damping member between a front motor mount and a lead screw bracket, dynamic vibration absorbers on a rear motor mount, and an inertial body within a coupling connected to the motor's rotating shaft to dampen vibrations and improve rotational accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is run at high rpm, then the productivity is improved, but the vibration of the motor cannot be dampened, thus causing noise
Solution Approach 1:
A damping member is introduced as an intermediary element between the motor and the lead screw bracket. This damping member absorbs and dissipates vibration energy, preventing it from being transmitted to other components. The damping member acts as a mediator that allows the motor to operate at high speeds while isolating the harmful vibrations and noise from the rest of the system.
2Device complexity
If the aspheric mirror makes point contact with the power transmission unit, then the device complexity is reduced, but the external force caused by motor vibration and friction is concentrated at one point, which may lead to wear and geometric transformation
Solution Approach 1:
The contact interface is segmented from a single point contact into a distributed contact area. The power transmission unit is designed to distribute the contact force across multiple points or a broader area on the aspheric mirror surface. This segmentation prevents stress concentration at a single point, reducing wear and geometric transformation while maintaining the simplicity of the overall device structure.
3Object-affected harmful factors
If a damping member is disposed between the front motor mount and the lead screw bracket, then the vibration of the motor is dampened, but the device complexity increases
Solution Approach 1:
The damping function is merged with existing structural components rather than adding a completely separate damping system. The damping member is integrated into the motor mounting structure, combining the structural support function with the vibration damping function in a single component or assembly. This approach provides effective vibration dampening while minimizing the increase in device complexity.
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
The module effectively dampens motor vibrations, enhances rotational accuracy, and increases the maximum number of rotations, while improving assembly and reducing noise and wear.
Implementation Method 1
a damping member fixedly disposed, using shoulder bolts, between the lead screw bracket and the front motor mount
Implementation Method 2
a plurality of dynamic vibration absorbers disposed on and coupled to the rear motor mount
Implementation Method 3
an inertial body disposed within a coupling that extends to and is connected to a rotating shaft of the motor
Data Source
AI summary
A head-up display driving module includes an aspheric mirror, a driver including a motor to rotate the aspheric mirror by raising or lowering a link part on a lead screw, a lead screw bracket to fix the lead screw, the lead screw bracket attached to a front motor mount of the motor, a damping member fixedly disposed, using shoulder bolts, between the lead screw bracket and the front motor mount, a rear motor mount at a rear of the motor, a plurality of absorbers disposed at the rear motor mount, the plurality of dynamic vibration absorbers protruding forward from the rear motor mount, and a coupling including a driving hub connected to the rotation shaft of the motor, a driven hub coupled to the lead screw, and a spacer disposed between the driving hub and the driven hub, wherein the spacer or the driven hub includes an inertial body.