Optical Path Control Film for Compact Sensor Light Routing
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Solution Overview
Problem
In miniaturized electronic devices, the light generated by the light emitting unit often fails to reflect off the intended object and reach the light receiving unit due to space constraints, leading to reduced sensitivity and incorrect information provision.
Innovation Solution
An optical film with pattern units having different refractive indices is used to control the optical path, ensuring information light is accurately directed to the light receiving unit while blocking miscellaneous light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sensor module components are stacked on an integrated element or disposed in a narrow space to achieve miniaturization, then the device size is reduced, but the light generated by the light emitting unit may be provided directly to the light receiving unit without reflecting information from the object, resulting in reduced sensitivity and measurement precision
Solution Approach 1:
An optical film is introduced as an intermediary component between the light emitting unit and light receiving unit. This optical film includes a light blocking pattern that selectively blocks light paths, ensuring that only light reflecting information from the external object reaches the light receiving unit, while preventing direct light transmission and internal reflections in miniaturized configurations
Solution Approach 2:
The optical film implements local quality control through spatially varying light blocking patterns. Different regions of the optical film have different light blocking properties, allowing selective control of light paths in specific directions while maintaining other optical functions, thereby enabling precise light path management in compact sensor modules
2Volume of moving object
If the light receiving unit is disposed close to the light emitting unit to reduce device size, then miniaturization is achieved, but miscellaneous light from the outside or reflected from internal structures may be provided to the light receiving unit, causing operational errors and reduced measurement accuracy
Solution Approach 1:
The optical film serves as a mediator that selectively filters light paths. The light blocking pattern within the optical film is designed to block miscellaneous light from external sources and internal reflections while allowing information-carrying light to pass through, thereby ensuring reliable and accurate measurements in miniaturized sensor modules
Solution Approach 2:
The optical film utilizes changes in optical parameters (light blocking properties) across different spatial locations. By varying the light blocking pattern density and distribution, the optical film selectively controls which light paths are permitted, enabling the system to distinguish between valid information light and spurious miscellaneous light
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 optical film efficiently supplies information light to the light receiving unit with high accuracy, minimizing measurement errors and enhancing sensor efficiency.
Implementation Method 1
an optical path control pattern unit formed on the base film, the optical path control pattern unit having a first refractive index, and a light absorption pattern unit formed on the base film, the light absorption pattern unit having a second refractive index less than the first refractive index
Data Source
AI summary
An optical film for controlling an optical path, includes: a base film; an optical path control pattern part, which is formed on the base film and has a first refractive index; a light absorption pattern part, which is formed on the base film and has a second refractive index that is relatively smaller than the first refractive index.