Optical Fingerprint Imaging via Camera Lens and Light Source

The patent uses an optical copying approach where a camera captures an optical image of the fingerprint instead of using expensive semiconductor sensors. The fingerprint is illuminated by a light source and the optical lens assembly captures the reflected light pattern, creating a cost-effective copy of the fingerprint image that achieves sufficient identification accuracy without semiconductor manufacturing costs.

The patent replaces the mechanical/electronic semiconductor sensor system with an optical system consisting of a camera, optical lens assembly, and light source. This substitution uses optical principles (light reflection and imaging) instead of electrical capacitance sensing, significantly reducing manufacturing cost while maintaining functional capability.

The patent employs exposure compensation technology that dynamically adjusts imaging parameters (exposure time, gain, etc.) based on the detected finger conditions. When the finger is sweaty, wet, or dirty, the system automatically modifies exposure parameters to compensate for the degraded optical conditions, maintaining image quality across varying environmental conditions.

The patent introduces a dynamic adjustment mechanism where the exposure parameters are not fixed but are adaptively changed based on real-time detection of finger conditions. The system continuously monitors the optical feedback and adjusts imaging parameters on-the-fly, making the optical system robust against variations in finger moisture and contamination.

The patent replaces the complex ultrasonic mechanical system with a simpler optical system. Instead of using ultrasonic waves and piezoelectric transducers, the invention uses light reflection and optical imaging, eliminating the need for complex mechanical components while achieving comparable or sufficient fingerprint capture capability.

The patent adopts a cost-effective optical imaging approach using standard camera components and simple optical elements rather than expensive, complex ultrasonic hardware. The system uses readily available optical components that can be easily manufactured and replaced, reducing overall device complexity and cost.