LED Device Cylindrical Lens for Bill Validator Detection
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Solution Overview
Problem
Existing LED devices with a shell-shaped plastic encapsulant suffer from light divergence, leading to light loss and reduced detection accuracy due to scattered light in irrelevant directions, making it difficult to differentiate between bright and shadow conditions in bill validators.
Innovation Solution
An LED device with a cylindrical lens that converges light from the LED chip into a wider linear beam in the desired vertical direction and a narrower beam in the horizontal direction, enhancing light directivity and accuracy by minimizing light deviation and radiation loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a shell-shaped plastic encapsulant with hemispherical top end is used to provide an optical hemispherical lens for converging light, then light convergence toward the detector is improved, but light radiates divergently toward an irradiance circle section causing loss of light in irrelevant directions and reducing detection accuracy
Solution Approach 1:
The patent applies local quality by designing the plastic encapsulant with different surface geometries for different functional regions: a planar lower surface for light entry and a cylindrical upper surface for beam formation. This localized geometric differentiation enables the encapsulant to simultaneously achieve light convergence and directional control, resolving the contradiction between light concentration and light loss by making different parts of the encapsulant serve different optical functions.
Solution Approach 2:
The patent changes the geometric parameters of the plastic encapsulant from a conventional hemispherical shape to a composite shape with a planar lower surface and a cylindrical upper surface. This parameter change transforms the light propagation characteristics, creating a substantially parallel light beam with controlled directivity. The cylindrical surface radius and height are specifically optimized to achieve the desired beam width and directivity angle, thereby improving detection accuracy while reducing light loss.
2Area of stationary object
If light is radially illuminated or radiated diverging toward an irradiance circle section, then light coverage area is increased, but light scattering reduces the amount of light reaching the detector and deteriorates accurate detection
Solution Approach 1:
The patent applies local quality by designing the plastic encapsulant with different surface geometries for different functional regions: a planar lower surface for light entry and a cylindrical upper surface for beam formation. This localized geometric differentiation enables the encapsulant to simultaneously achieve light convergence and directional control, resolving the contradiction between light concentration and light loss by making different parts of the encapsulant serve different optical functions.
Solution Approach 2:
The patent changes the geometric parameters of the plastic encapsulant from a conventional hemispherical shape to a composite shape with a planar lower surface and a cylindrical upper surface. This parameter change transforms the light propagation characteristics, creating a substantially parallel light beam with controlled directivity. The cylindrical surface radius and height are specifically optimized to achieve the desired beam width and directivity angle, thereby improving detection accuracy while reducing light loss.
3Measurement precision
If a cylindrical lens is used to converge light into a linear beam section widened in the first irradiative direction and narrowed in the second irradiative direction, then light directivity angular range is widened in the necessary direction, but light directivity angular range is narrowed in the unnecessary direction
Solution Approach 1:
The patent applies local quality by designing the plastic encapsulant with different surface geometries for different functional regions: a planar lower surface for light entry and a cylindrical upper surface for beam formation. This localized geometric differentiation enables the encapsulant to simultaneously achieve light convergence and directional control, resolving the contradiction between light concentration and light loss by making different parts of the encapsulant serve different optical functions.
Solution Approach 2:
The patent changes the geometric parameters of the plastic encapsulant from a conventional hemispherical shape to a composite shape with a planar lower surface and a cylindrical upper surface. This parameter change transforms the light propagation characteristics, creating a substantially parallel light beam with controlled directivity. The cylindrical surface radius and height are specifically optimized to achieve the desired beam width and directivity angle, thereby improving detection accuracy while reducing light loss.
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 cylindrical lens design improves detection accuracy by maintaining light focus in the necessary direction, reducing light loss and enhancing the ability to discern objects in bill validators, ensuring precise detection of bills or foreign objects.
Implementation Method 1
When light from LED chip (5) is irradiated through cylindrical lens (8) out of plastic encapsulant (7), outer surface of cylindrical lens (8) serves to transform light from LED chip (5) into a substantially parallel light beam
Implementation Method 2
an LED chip (5) mounted on support (3) and electrically connected to support (3) and joint area (4)
Data Source
AI summary
An LED device is provided which comprises a plastic encapsulant 7 formed with an integrated cylindrical lens 8 disposed opposite to an LED chip 5 to provide light from LED chip 5 with the wider directivity angular range in the vertical Y irradiative direction than that in the horizontal X irradiative direction. When light from LED chip 5 is irradiated through cylindrical lens 8 out of plastic encapsulant 7, an outer surface of cylindrical lens 8 serves to transform light from LED chip 5 into a substantially parallel light beam which has a generally linear beam section wider in the directivity angular range of the necessary vertical Y irradiative direction, and narrower in the directivity angular range of the unnecessary horizontal X irradiative direction.