Optical Scanning Device Attaching Part Orientation for Thermal Shift Compensation
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Solution Overview
Problem
Conventional optical scanning devices, such as those used in HUD systems, face issues with positional shifts of optical components due to temperature changes, leading to displaced light irradiation and degraded image quality, especially in harsh in-vehicle environments where temperature fluctuations are significant.
Innovation Solution
The optical scanning device is designed with the attaching part's displacement direction aligned with the main scanning direction, utilizing timing sensors to adjust the write timing of laser light to correct for positional shifts, ensuring stable image projection on the windshield by maintaining precise overlap of red, green, and blue laser beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical member is attached to the casing using a conventional attaching part, then the device structure is simple, but the position of the optical member changes due to thermal expansion and contraction, causing light irradiation position displacement
Solution Approach 1:
The patent changes the orientation parameter of the attaching part from a conventional configuration to one where its longitudinal direction is aligned with the main scanning direction. This parameter change allows the attaching part to expand and contract along the scanning direction without causing positional displacement in the direction that would affect light irradiation accuracy, thereby resolving the contradiction between simple structure and positioning precision.
2Adaptability or versatility
If the attaching part is disposed in a direction other than the main scanning direction, then the structural design is flexible, but the light irradiation position is displaced due to thermal deformation
Solution Approach 1:
The patent specifies that the longitudinal direction of the attaching part must be aligned with the main scanning direction of the scanning unit. This parameter constraint ensures that thermal expansion and contraction occur along the scanning direction, which is compensated by the scanning system, thereby maintaining reliable light irradiation position stability while allowing structural flexibility.
3Adaptability or versatility
If the optical member position changes due to attaching part deformation, then the device can accommodate temperature changes, but the image projection position on the windshield is shifted
Solution Approach 1:
The patent aligns the attaching part's longitudinal direction with the main scanning direction, allowing the system to adapt to temperature changes while maintaining image projection precision. The scanning unit compensates for any positional changes by adjusting the scanning pattern, thereby resolving the contradiction between temperature adaptability and image projection accuracy.
Solution Approach 2:
The patent employs a feedback mechanism where the scanning unit detects and compensates for light irradiation position displacements caused by attaching part thermal deformation. This feedback control ensures that image projection position remains accurate even when the attaching part deforms due to temperature 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
This configuration effectively prevents image quality degradation due to temperature-induced positional shifts, maintaining accurate and stable image projection even under varying environmental conditions.
Implementation Method 1
the attaching part expands and contracts due to temperature changes
Data Source
AI summary
An optical scanning device includes: a light source; a scanning unit configured to deflect light from the light source in a main scanning direction to scan a scanned area with light; an optical member configured to guide light from the light source to the scanning unit; a casing holding the light source and the optical member; and an attaching part disposed between the optical member and the casing to attach a part of the optical member to the casing, wherein a direction in which the attaching part is interposed aligns with a direction corresponding to the main scanning direction of the scanning unit.