Headup Display Motor Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional headup display devices using stepping motors can generate abnormal sounds due to vibrations transmitted through the lead screw and nut mechanism, affecting the angular adjustment of the mirror holder and the projection direction of display light.
Innovation Solution
A headup display device employing a motor with a worm and worm wheel mechanism, where a compression coil spring is used to bias the worm and motor shaft, absorbing vibrations and reducing noise during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stepping motor is driven while the motor is subjected to a rotation driving force, then the lead screw part rotates and the nut reciprocally moves along the axial direction, but vibration of the stepping motor is transmitted through the lead screw part and nut to the mirror holder, generating abnormal sound
Solution Approach 1:
A vibration absorbing member is introduced as an intermediary element between the nut and the mirror holder. This member absorbs vibrations generated by the stepping motor during operation, preventing them from being transmitted to the mirror holder and concave mirror, thereby eliminating abnormal sound while maintaining the angular adjustment function
Solution Approach 2:
The vibration absorbing member converts the harmful vibration energy into beneficial damping, transforming the harmful factor (vibration) into a benefit (vibration absorption) that protects the mirror holder from vibration-induced abnormal sound
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 solution effectively minimizes abnormal sound generation during motor operation, ensuring smooth angular adjustment of the reflection member and stable projection of display light without noise interference.
Implementation Method 1
there may be a case in which abnormal sound is generated due to vibration of the stepping motor being sequentially transmitted
Implementation Method 2
a compression coil spring used to bias the worm and motor shaft
Implementation Method 3
a reflection member for reflecting the display light emitted from this display
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Provided is a headup display device which is not liable to generate abnormal sound. The headup display device comprises: a liquid crystal display (20) for emitting display light (M); a concave mirror (D1) for reflecting the display light (M); and a motor device (1) for rotating the concave mirror (D1). The motor device (1) includes: a motor (10) having a motor shaft (150) projecting from a motor body (110); a worm (2) connected to the motor shaft (150) and having a spiral groove (21) formed on the outer peripheral surface (20); and a worm wheel (3) provided with teeth (36) engaging with the spiral groove (21) and transmitting a driving force from the motor (10) to the concave mirror (D1). A hole (23) is formed inside the worm (2) extending in the axial direction of the worm (2) from the end face (292) of the worm (2) near the motor body (110). A compression coil spring (8) is arranged in the hole (23) for biasing the worm (2) in the direction opposite the motor body (110) and biasing the motor shaft (150) toward the motor body (110).