Light Emitting Device Non-Spherical Lens Illuminance Control
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Solution Overview
Problem
Conventional light emitting devices using surface emitting lasers struggle to form light with desired illuminance distribution, particularly in achieving uniformity and suitable illuminance patterns for applications like distance measurement.
Innovation Solution
A light emitting device with a substrate featuring a plurality of light emitting elements and lenses, including non-spherical lenses such as axicon, pyramidal, hyperboloid, and Fresnel lenses, which form light with controlled illuminance distribution by adjusting the shape and arrangement of lenses to achieve low central and high peripheral illuminance or uniformity, and a drive device for precise control of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If spherical lenses or ellipsoidal lenses are used, then the structure is simple and easy to manufacture, but the illuminance distribution cannot be controlled to achieve desired patterns
Solution Approach 1:
The patent applies parameter changes by modifying the lens shape from conventional spherical or ellipsoidal forms to specialized geometries (axicon, pyramidal, hyperboloid, parabolic). These shape parameter changes enable precise control over light refraction patterns, achieving desired illuminance distributions with low central illuminance and high peripheral illuminance that cannot be obtained with standard lens shapes.
2Illumination intensity
If non-spherical lenses are used to achieve desired illuminance distribution, then light can be properly formed, but the manufacturing process becomes more difficult
Solution Approach 1:
The patent applies segmentation by dividing the substrate surface into multiple regions, each equipped with specific types of lenses (axicon, pyramidal, hyperboloid, parabolic) tailored to local illuminance requirements. This modular approach allows complex illuminance distribution patterns to be achieved through coordinated action of simpler individual lens elements, making the overall system more manufacturable than a single complex lens design.
3Illumination intensity
If multiple types of lenses are combined to achieve uniform illuminance, then good illuminance uniformity can be obtained, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by assigning different lens types to different spatial locations within the lens array. Specifically, axicon lenses are positioned in regions requiring low central illuminance, while pyramidal, hyperboloid, or parabolic lenses are placed in regions requiring different illuminance characteristics. This location-dependent lens selection achieves uniform overall illuminance distribution while allowing each local region to be optimized independently, simplifying the design process compared to a fully uniform complex lens design.
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 device effectively forms light with desired illuminance distribution, enhancing the suitability for distance measurement by providing uniform illumination and reducing the circuit scale of the drive device, while allowing for precise control and alignment adjustments.
Implementation Method 1
a plurality of lenses provided at a second surface of the substrate... light emitted from the plurality of light emitting elements can be formed into light having a desired illuminance distribution
Data Source
AI summary
There are provided a light emitting device capable of suitably forming light from a plurality of light emitting elements and a distance measuring device.A light emitting device according to the present disclosure includes a substrate, a plurality of light emitting elements provided at a first surface of the substrate, and a plurality of lenses provided at a second surface of the substrate. The plurality of lenses includes a first lens other than a spherical lens and an ellipsoidal lens.