Optical Fingerprint Module With Prism Path for Multi-Function Sensing
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Solution Overview
Problem
Conventional optical fingerprint identification devices are limited to fingerprint identification and cannot perform heart rate measurement or finger navigation, lacking the capability to integrate these functions.
Innovation Solution
An optical identification device incorporating a prism to alter the transmission direction of optical signals, using invisible light, an anti-reflection component to enhance signal penetration, and optical diffusion components to improve detection accuracy and clarity, along with a protection component to manage refractive indices for clear fingerprint details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical fingerprint identification devices use visible beam and top cover as light detection region, then fingerprint identification can be achieved, but the device cannot execute heart rate measurement and finger navigation
Solution Approach 1:
The patent implements multi-functionality by enabling the optical detection module to perform multiple functions: fingerprint identification through the top cover, heart rate measurement through the bottom cover, and finger navigation. The optical detection module is designed to detect different types of information (fingerprint patterns, blood flow changes, and touch location) using the same basic optical components, allowing one device to replace multiple separate devices.
2Measurement precision
If optical detection module projects optical signal vertically onto top cover, then simple optical path is maintained, but detection accuracy and signal penetration are insufficient
Solution Approach 1:
The patent introduces asymmetry in the optical path by using an inclined projection angle (45-60 degrees) instead of vertical projection. This asymmetric angle, combined with the prism's specific apex angle (less than 70 degrees), optimizes the optical signal's interaction with the top cover to enhance detection accuracy while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces an anti-reflection component as an intermediary between the optical signal and the top cover. This component mediates the optical interaction by reducing reflection and increasing signal penetration into the top cover, thereby improving detection accuracy without requiring complex optical path modifications.
3Reliability
If anti-reflection component with refractive index matching top cover is used, then signal penetration is maximized, but reflection management becomes complex
Solution Approach 1:
The patent optimizes the refractive index parameter of the anti-reflection component, specifying it should be between 1.2 and 1.8 and less than the top cover's refractive index (1.4-1.6). This parameter optimization creates an ideal gradient for light penetration while managing reflection through controlled refractive index differences, achieving high reliability without excessive complexity.
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
Enables simultaneous fingerprint identification, heart rate measurement, and finger navigation with enhanced detection accuracy and clarity by utilizing invisible light and optimized refractive index management.
Implementation Method 1
The optical deviation component is disposed on the light emitter of the optical detection module and adapted to change a transmission direction of an optical signal emitted by the light emitter
Implementation Method 2
The optical deviation component is a prism, and an apex angle of the prism is smaller than seventy degrees
Implementation Method 3
The anti-reflection component is disposed on a surface of the top cover facing the optical detection module and adapted to increase a penetration rate of the optical signal projected onto the top cover
Implementation Method 4
a refractive index of the anti-reflection component is smaller than a refractive index of the top cover
Data Source
AI summary
An optical identification device includes a top cover, a circuit board, an optical detection module, an optical deviation component and an anti-reflection component. The circuit board is disposed under the top cover. The optical detection module is disposed on the circuit board, and the optical detection module includes a light emitter and a light receiver. The optical deviation component is disposed on the light emitter of the optical detection module and adapted to change a transmission direction of an optical signal emitted by the light emitter, so that the optical signal is projected onto the top cover in an inclined manner. The anti-reflection component is disposed on a surface of the top cover facing the optical detection module and adapted to increase a penetration rate of the optical signal projected onto the top cover.