Light Source Device Curved Connection Stray Light Reduction
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Solution Overview
Problem
Conventional light source devices for photoelectric encoders suffer from stray light generation due to corner portions, leading to reduced detection accuracy and reliability in optical displacement detection.
Innovation Solution
A light source device with a translucent member featuring a curved connection portion and an antireflection member, which reduces stray light by transmitting or absorbing light, ensuring parallel light emission and device miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a corner portion is formed by connecting the optical axis plane and orthogonal plane, then device miniaturization is achieved, but stray light is generated reducing measurement precision
Solution Approach 1:
The patent applies curvature by replacing the corner portion with a curved surface connection between the optical axis plane and orthogonal plane. This curved surface eliminates the sharp corner that causes light scattering while maintaining the compact device structure. The curved transition allows light to pass through without reflecting off the corner, thus reducing stray light generation.
2Volume of moving object
If parallel light emission is achieved using conventional lens design, then device compactness is improved, but stray light causes noise in displacement detection
Solution Approach 1:
The patent converts the potentially harmful corner portion into a beneficial curved surface structure. Instead of eliminating the corner entirely (which would increase size), the design uses the curved surface to transform the light scattering effect into a controlled light transmission path, eliminating stray light while maintaining compactness.
3Illumination intensity
If reflection film is used on lens member to generate parallel light, then light intensity is increased, but corner portions become scattering points generating stray light
Solution Approach 1:
The patent applies local quality by differentiating the surface properties at different locations. The optical axis plane and orthogonal plane maintain their reflective properties for generating parallel light, while the corner portion is transformed into a curved transmission surface that allows light to pass through without scattering. This localized differentiation resolves the contradiction between light intensity and reliability.
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 enhances measurement accuracy and reliability by minimizing stray light, allowing for precise displacement detection while maintaining device compactness.
Implementation Method 1
a translucent member configured to accommodate the light emitting unit thereinside, and to make light emitted from the light emitting unit, into parallel light
Implementation Method 2
a connection portion formed by the optical axis plane and the orthogonal plane connecting to each other, and having a curved surface
Data Source
AI summary
Provided are a light source device that can achieve higher accuracy while maintaining reliability by reducing stray light, and a photoelectric encoder including the same. A light source device 2 includes a translucent member 10 configured to accommodate a light emitting unit 5 thereinside, and to make light emitted from the light emitting unit 5, into parallel light. The translucent member 10 includes an optical axis plane 11, an orthogonal plane 12, a reflection portion configured to make light from the light emitting unit 5, into parallel light, and a connection portion 14 formed by the optical axis plane 11 and the orthogonal plane 12 connecting to each other, and having a curved surface. A central axis AX of the curved surface is in an outside region of the translucent member 10, and a region between the optical axis plane 11 and the orthogonal plane 12.