Photoelectric Sensor Resin Case Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Photoelectric sensors are not compact enough to be installed in narrower spaces due to their size, and they are susceptible to radiation noise affecting the photoelectric element.
Innovation Solution
A compact photoelectric sensor design featuring a resin case with a condensing lens, a circuit board with a photoelectric element, and a metal plate member insert-molded parallel to the circuit board, with cutout sections and folded sections embedded in the resin to enhance integration strength and compactness, while maintaining insulation and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal shield case is fixed to the circuit board to shield the photoelectric element, then electromagnetic shielding performance is improved, but device size increases and compactness is reduced
Solution Approach 1:
The patent merges the electromagnetic shielding function with the circuit board structure itself by forming a ground-level shielding pattern face directly on the circuit board. This integration eliminates the need for separate metal shield cases, achieving effective electromagnetic shielding while maintaining compact device dimensions. The shielding pattern is formed as part of the circuit board's ground structure, combining multiple functions into a single component.
Solution Approach 2:
The patent introduces a resin layer as an intermediary between the photoelectric element and the external environment. This resin layer provides natural insulation and positioning for the photoelectric element while the ground-level shielding pattern face on the circuit board provides electromagnetic shielding. The combination of these intermediaries achieves shielding performance without requiring additional metal shield structures that would increase device size.
2Adaptability or versatility
If the photoelectric sensor is made more compact for installation in narrower spaces, then adaptability is improved, but electromagnetic shielding effectiveness may be compromised
Solution Approach 1:
The patent applies local quality by concentrating the electromagnetic shielding function at the specific location where the photoelectric element is mounted on the circuit board. The ground-level shielding pattern face is formed locally around the photoelectric element's mounting area, providing targeted shielding where it is most needed. This localized approach maintains shielding effectiveness while minimizing the overall space required, enabling compact design for narrow installation spaces.
3Volume of moving object
If the plate member is positioned close to the circuit board to reduce thickness, then compactness is improved, but insulation between the plate member and photoelectric element must be ensured
Solution Approach 1:
The patent uses the resin material as an intermediary between the metal plate member and the photoelectric element. The resin provides both structural support and electrical insulation, allowing the plate member to be positioned close to the circuit board for compactness while maintaining adequate insulation. The resin layer acts as a natural barrier that prevents direct contact between conductive elements, ensuring electrical isolation without requiring additional insulation components.
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 design allows for a more compact photoelectric sensor that is less prone to radiation noise interference and maintains structural integrity, enabling installation in narrower spaces.
Implementation Method 1
a condensing lens 61 made of resin or glass and serving to condense light
Implementation Method 2
the photoelectric element 33 is mounted on the back face 31b of the circuit board 31 and serves to receive the light having passed through the through hole 31c
Data Source
AI summary
In a case made of resin and provided with a condensing lens through which light is transmitted, a circuit board on which a photoelectric element to be disposed at the focus position of the condensing lens is accommodated. The circuit board has a through hole through which the light having been transmitted through the condensing lens passes. Furthermore, the photoelectric element is mounted on the back face of the circuit board on the opposite side of the condensing lens and receives the light having passed through the through hole.