Light Source Device Asymmetric Lens Axis Displacement
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Solution Overview
Problem
Existing light source devices face a challenge in achieving high luminance without significantly increasing their size, as increasing the number of light source units typically results in a larger device.
Innovation Solution
The design incorporates multiple light source units with semiconductor laser elements arranged in a matrix, where the central axis of each light source unit is displaced from the optical axis of the lens it enters, allowing for efficient light collection using lenses with low spherical aberration and reflective mirrors, enabling the integration of more units without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light source units is increased to achieve high luminance, then the luminance is improved, but the device size increases
Solution Approach 1:
The patent arranges light source units in a matrix configuration with their central axes displaced from the optical axis of the lens, utilizing spatial distribution in multiple dimensions. This allows multiple light source units to be integrated without proportionally increasing the device size, as they share the optical path through the lens system.
Solution Approach 2:
The lens system is designed to collect and guide light from multiple light source units simultaneously, serving multiple functions: collecting light from displaced sources, correcting spherical aberration, and directing light through the optical axis. This multi-functionality allows the same optical components to handle increased light source density without requiring additional components that would increase device size.
2Illumination intensity
If multiple light source units are integrated to increase luminance, then the luminance is improved, but the thermal strain on lenses increases
Solution Approach 1:
The patent divides the light source into multiple separate light source units arranged in a matrix, where each unit has its central axis displaced from the lens optical axis. This segmentation distributes the thermal load across different spatial locations and allows the lens system to manage heat more effectively, preventing concentrated thermal strain on any single point of the lens.
3Use of energy by moving object
If light source units are positioned on the optical axis for efficient light collection, then the light collection efficiency is improved, but the device complexity increases when integrating multiple units
Solution Approach 1:
The patent employs asymmetric positioning of light source units relative to the lens optical axis, with central axes deliberately displaced. This asymmetric arrangement, combined with the lens's ability to correct spherical aberration, maintains effective light collection while simplifying the overall integration compared to attempting to position multiple sources directly on the optical axis, which would require complex beam combining optics.
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 achieves high luminance while maintaining a compact size by fully collecting light from multiple units, reducing thermal strain on lenses, and allowing flexible positioning of light source units relative to lenses.
Implementation Method 1
a lens having a low spherical aberration; the central axis of the light from the light source unit being displaced from an optical axis of the lens on which the light is incident
Implementation Method 2
The first light enters the third lens after passing through the first lens and the mirror. The second light enters the third lens after passing through the second lens and being reflected by the mirror.
Data Source
AI summary
A light source device 20 includes light source units 200a to 200d, lenses 203a, 203b, and 205, and mirrors 204a and 204b. Light source units 200a, 200b and/or light source units 200c, 200d are placed such that the light from units 200a to 200d either enters lens 203a at a position deviated from the optical axis of lens 203a or enters lens 203b at a position deviated from the optical axis of lens 203b.