Optical Sensing Unit With Refractive Layers For Light Spot Formation
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Solution Overview
Problem
Existing optical sensing arrays have low light sensing efficiency due to most incident light falling outside photosensitive regions, resulting in inefficient light utilization.
Innovation Solution
An optical system that forms multiple light spots on separated photosensitive regions using a lens, a first light-transmitting layer, and a second light-transmitting layer, where the second light-transmitting layer includes dielectric layers with convex or concave structures to refract light beams and improve light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single lens is used to focus light, then the optical system is simple, but most incident light falls outside the photosensitive regions resulting in low light sensing efficiency
Solution Approach 1:
The patent divides the optical system into multiple functional layers: a lens layer for light collection, a first light-transmitting layer with first convex structures for initial light refraction, and a second light-transmitting layer with second convex structures for final light focusing. This segmentation allows each layer to contribute to directing light onto the photosensitive regions, thereby improving light sensing efficiency while maintaining reasonable system complexity through modular design.
2Productivity
If the photosensitive regions are arranged in a conventional pattern, then the device structure is simple, but the area proportion of photosensitive regions is low leading to inefficient light utilization
Solution Approach 1:
The patent introduces convex structures with specific refractive indices at strategic locations within the light-transmitting layers. These localized optical elements modify the light path in specific regions to concentrate incident light onto the photosensitive regions. This local modification of optical properties enables more effective light utilization without requiring an increase in the overall area proportion of photosensitive regions.
3Illumination intensity
If light is allowed to pass through multiple layers, then light distribution can be improved, but the optical system becomes more complex
Solution Approach 1:
The patent combines multiple light-transmitting layers with different convex structures into a single integrated optical system. The first light-transmitting layer with first convex structures and the second light-transmitting layer with second convex structures work together to progressively refract and focus light onto the photosensitive regions. This merging of multiple functional layers into one cohesive system achieves improved light intensity on photosensitive regions while managing the complexity through integrated 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
This configuration enhances light intensity on photosensitive regions, improving light sensing efficiency by ensuring more light is incident on the sensitive areas while minimizing light on non-photosensitive regions.
Implementation Method 1
a lens for receiving a first light beam incident on an optical sensing unit and converging the first light beam
Implementation Method 2
a first light-transmitting layer, located under the lens and used for refracting the converged first light beam into a plurality of second light beams
Implementation Method 3
the upper surface of the second dielectric layer is provided with at least one convex structure or at least one concave structure, and each structure of the at least one convex structure or the at least one concave structure refracts light incident on its light-incident surface
Data Source
AI summary
The disclosure provides an optical system, an optical sensing unit and an optical sensing module. The optical system is used for forming a plurality of light spots on a plurality of photosensitive regions separated from each other. The optical system includes: a lens for receiving a first light beam and converging the first light beam; a first light-transmitting layer located under the lens, for refracting the converged first light beam into a plurality of second light beams, the plurality of second light beams being used for forming the plurality of light spots on the photosensitive regions, wherein each light spot in the plurality of light spots covers a part of the plurality of photosensitive regions; and a second light-transmitting layer located under the first light-transmitting layer, wherein the plurality of second light beams are respectively incident on the plurality of photosensitive regions through the second light-transmitting layer.