Optical Identification Device Using Channel for Uniform Illumination
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Solution Overview
Problem
Conventional optical fingerprint identification devices using invisible light sources face challenges in size reduction and often result in detection images with unexpected dark regions due to the placement of light sources and receivers relative to the target object.
Innovation Solution
An optical identification device utilizing an optical channel to direct an invisible illumination beam from an emitter through a top cover onto a target object, ensuring uniform illumination and preventing light from projecting onto lower surfaces, thereby eliminating dark regions in the detection image. This device includes a circuit board, top cover, optical detection module, and optical channel with a first end pointing towards the emitter and a second end abutting the top cover, allowing the beam to pierce through for clear fingerprint imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invisible light source is used for fingerprint identification, then detection image quality is improved, but device size increases due to placement requirements
Solution Approach 1:
The patent positions the optical emitter and optical receiver at different heights (vertical dimension) rather than only lateral separation, allowing the illumination beam to travel downward through the top cover and target object to reach the receiver, thus reducing lateral space requirements while maintaining detection quality
Solution Approach 2:
The top cover serves as an intermediary component that the illumination beam passes through to reach the target object, enabling compact integration of the emitter and receiver within the same housing structure while maintaining optical path integrity
2Device complexity
If illumination beam projects onto lower surface of identification region, then device structure is simplified, but unexpected dark regions appear in detection image
Solution Approach 1:
The optical channel extracts and guides the illumination beam along a controlled path, separating the illumination function from direct projection onto the identification region, thereby preventing dark regions while maintaining structural simplicity
Solution Approach 2:
The patent replaces direct mechanical projection of light with optical guiding through the optical channel, using optical principles rather than direct geometric projection to control light path and eliminate dark regions
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 enables a compact optical identification device that provides clear fingerprint images without dark regions, even when the target object has uneven surfaces, by ensuring the optical transmission path is unobstructed and uniformly illuminating the target, thus enhancing image clarity and accuracy.
Implementation Method 1
The optical emitter is adapted to emit an illumination beam toward the top cover
Implementation Method 2
The optical receiver is adapted to receive the illumination beam reflected from the top cover
Data Source
AI summary
An optical identification device includes a circuit board, a top cover, an optical detection module and an optical channel. The top cover is disposed on the circuit board and has an identification region. The optical detection module is disposed on the circuit board and located inside the top cover. The optical detection module includes an optical emitter and an optical receiver. The optical emitter is adapted to emit an illumination beam toward the top cover. The optical receiver is adapted to receive the illumination beam reflected from the top cover. The optical channel is disposed between the optical emitter and the top cover, and adapted to block the illumination beam from projecting onto a lower surface of the identification region facing the optical receiver.