Multi-Laser Lens Layout for Precise Beam Collimation
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Solution Overview
Problem
Existing light emitting devices with semiconductor laser elements face challenges in achieving precise adjustment accuracy due to mounting errors, as simply adjusting the tilt angle of the lens array is insufficient to ensure collimated light within the target quality range, especially when combining different types of laser diodes or light emitting elements with varying diverging angles.
Innovation Solution
Incorporating a plurality of sub-lenses within the light emitting device, positioned between the light emitting elements and main lenses, allows for independent adjustment to compensate for positional deviations and differences in beam diameters and diverging angles, ensuring that the light emitted through the main lenses is within the target quality range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only the tilt angle of the lens array is adjusted to compensate for mounting errors, then the parallelism of collimated light is improved, but the adjustment accuracy is insufficient to achieve target quality range
Solution Approach 1:
The optical system is segmented into multiple independent adjustment components: the lens array tilt angle adjustment and the sub-lens position adjustment. This segmentation allows each component to address specific aspects of alignment independently, with the sub-lenses compensating for residual errors that the lens array tilt adjustment cannot correct, thereby achieving the target quality range for collimated light.
2Measurement precision
If sub-lenses are added to enable precise adjustment of each light emitting element, then adjustment accuracy is improved, but device complexity increases
Solution Approach 1:
The sub-lenses are integrated into the existing lens array structure, forming a combined optical system where sub-lenses and main lenses work together. This merging approach allows the additional adjustment functionality to be incorporated without creating a completely separate complex system, as the sub-lenses share the same mounting structure and optical path as the main lenses.
Solution Approach 2:
The sub-lenses serve multiple functions: they correct mounting errors of individual light emitting elements, compensate for differences in beam diameters and diverging angles, and work in conjunction with the main lenses to achieve overall collimation. This multi-functionality reduces the need for separate correction mechanisms, thereby limiting the increase in device complexity.
3Volume of moving object
If sub-lenses are placed internally between light emitting elements and main lenses, then device miniaturization is achieved, but light transmission path is constrained
Solution Approach 1:
The sub-lenses are nested within the optical path between the light emitting elements and the main lenses, effectively placing one optical component inside the existing optical structure. This nesting approach minimizes the increase in device volume, as the sub-lenses occupy space already required for the optical path rather than adding external bulk.
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 use of sub-lenses enables precise adjustment and correction of light emission, resulting in improved collimation and convergence of light beams, achieving the desired quality and miniaturization of the light emitting device by allowing for smaller sub-lens dimensions and reduced degradation through internal placement.
Implementation Method 1
a first sub-lens located in an optical path between the first light emitting element and the first main lens and a second sub-lens located in an optical path between the second light emitting element and the second lens
Data Source
AI summary
A light emitting device includes: a plurality of laser elements including a first laser element and a second laser element; a case enclosing the laser elements and including a light-transmissive region; and a plurality of main lenses including a first main lens configured to collimate or converge light emitted from the first laser element and a second main lens configured to collimate or converge light emitted from the second laser element. At least a first portion of the light-transmissive region is disposed on a first imaginary line passing through a light emitting end surface of the first laser element and the first main lens, and at least a second portion of the light-transmissive region is disposed on a second imaginary line passing through a light emitting end surface of the second laser element and the second main lens.