Lensless Light Guide Detection for Directivity and Depth of Field
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Solution Overview
Problem
Existing imaging devices face challenges in improving subject detection accuracy, particularly in configurations without lenses, and there is a need for enhanced detection methods that can achieve high directivity and depth of field without focusing.
Innovation Solution
A detection device comprising a light guide unit with a light incidence opening and a smaller emission opening, coupled with a detection unit that performs photoelectric conversion using photodiodes, allowing for subject detection without lenses and achieving high directivity and depth of field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens is used for subject detection, then detection accuracy is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts and eliminates the lens component from the detection system. Instead of using a lens to focus light onto the photodetector, the invention employs a lensless detection architecture where light is directly guided through a light guide unit to the detection element, thereby simplifying device structure while maintaining detection capability
Solution Approach 2:
The patent introduces a light guide unit as an intermediary component between the light source and photodetector. This light guide unit with its specific opening configuration (larger light incidence opening and smaller light emission opening) serves as a mediator to control light propagation and achieve directivity without requiring a lens
2Measurement precision
If a lens is used for focusing, then detection accuracy is improved, but depth of field is reduced
Solution Approach 1:
The patent removes the focusing function performed by lenses and replaces it with a lensless direct detection approach. The light guide unit's geometry (with its specific opening sizes and ratios) provides inherent directionality without creating a focused image plane, thereby enabling a extended depth of field where objects at various distances can be detected
3Quantity of substance
If the light emission opening is made larger to increase light intake, then light gathering capability is improved, but directivity is reduced
Solution Approach 1:
The patent applies local quality by creating a spatial gradient in the light guide unit's opening sizes. The light incidence opening is made larger to maximize light intake from the subject, while the light emission opening is made smaller to maintain directional control. This local variation in opening dimensions allows the system to simultaneously achieve both high light gathering capability and good directivity
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 solution enables clear and high-resolution subject detection with improved directivity and depth of field, reducing the need for focusing and enhancing detection accuracy.
Implementation Method 1
a light guide unit having a light incidence opening for entry of light and a light emission opening smaller in size than the light incidence opening, the light entering through the light incidence opening being emitted through the light emission opening
Implementation Method 2
a detection unit configured to detect the light emitted through the light emission opening
Data Source
AI summary
In order to detect a subject in a lensless manner, this detection device has: a light guide unit having a light incidence opening for entry of light and a light emission opening smaller in size than the light incidence opening, the light entering through the light incidence opening being emitted through the light emission opening; and a detection unit configured to detect the light emitted through the light emission opening.