Laser Lens Assembly with Adjustable Sub-Lenses for Precise Collimation
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Solution Overview
Problem
Existing light emitting devices with semiconductor laser elements and lens arrays face challenges in achieving sufficient adjustment accuracy due to mounting errors, which affect the collimation and direction of light emitted.
Innovation Solution
The light emitting device incorporates a plurality of main lenses and sub-lenses, where the sub-lenses are strategically placed in the optical path between the light emitting elements and the main lenses, allowing for independent adjustment to compensate for positional deviations and optimize light collimation.
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
Solution Approach 1:
The lens system is divided into two independent parts: a lens array with multiple lenses and separate sub-lenses. Each sub-lens can be independently adjusted in position and tilt angle, allowing fine-tuned compensation for mounting errors. This segmentation enables higher adjustment accuracy compared to adjusting the entire lens array as a single unit.
Solution Approach 2:
The sub-lenses are designed to be movable relative to the lens array, allowing dynamic adjustment of their positions and tilt angles. This dynamic capability enables precise optimization of light collimation by adjusting each sub-lens individually, thereby improving adjustment accuracy beyond what is achievable with a fixed lens array.
2Manufacturing precision
If sub-lenses are added to the optical path between light emitting elements and main lenses, then adjustment accuracy and light collimation are improved, but device complexity increases
Solution Approach 1:
The optical system is segmented into lens array components and sub-lens components, with each serving a specific function. The sub-lenses are positioned between the light emitting elements and the main lenses, creating a multi-stage optical path that enables precise control over light collimation while maintaining modular architecture.
Solution Approach 2:
The sub-lenses act as intermediary optical elements between the light emitting elements and the main lens array. These sub-lenses pre-condition the light beams by correcting diverging angles and positioning, thereby facilitating the main lenses' ability to produce high-quality collimated light with improved manufacturing precision.
3Ease of manufacture
If the position of light emitting regions has mounting errors, then device assembly is simplified, but light direction and collimation deviate from target quality
Solution Approach 1:
The sub-lenses are adjusted beforehand to compensate for anticipated mounting errors in the light emitting elements. By pre-positioning and pre-tilting the sub-lenses, the system proactively corrects for deviations in light direction and collimation, ensuring that even with simplified assembly procedures, the final light emission quality meets target specifications.
Solution Approach 2:
The adjustable sub-lenses provide a feedback mechanism for correcting mounting errors. During assembly and testing, the positions and angles of the sub-lenses can be adjusted based on observed light emission characteristics, thereby compensating for mounting inaccuracies and ensuring the light direction and collimation meet quality requirements.
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 enhances the adjustment accuracy of light emission, ensuring that the light emitted through the main lenses is within a target quality range, with improved collimation and reduced deviations in light direction.
Implementation Method 1
a plurality of sub-lenses disposed in the case, the plurality of sub-lenses including 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 main lens
Data Source
AI summary
A light emitting device includes: a laser element; a case enclosing the laser element, the case including a light-transmissive region configured to allow light emitted from the laser element to transmit through the light-transmissive region; a first lens configured to collimate or converge light emitted from the laser element; and a second lens that is disposed in the case and spaced apart from the first lens, the second lens located in an optical path between the laser element and the first lens. The second lens is spaced apart from the light-transmissive region such that an open space is located in the case between the light-transmissive region and the second lens.