Combined Fingerprint Reader Power Button Key Reducing Stack Height

The patent combines the fingerprint reader and power button into a single integrated key structure. The fingerprint sensor is embedded within the key surface, while the power button functionality is achieved through the same key mechanism. This merging of two separate functions into one component eliminates the need for separate fingerprint reader and power button structures, thereby reducing overall device thickness while maintaining both authentication and power control capabilities.

The key structure serves multiple functions simultaneously: it acts as a fingerprint authentication sensor, a power button, and a keyboard input key. The fingerprint sensor is integrated into the key surface, allowing the same physical component to perform biometric authentication, power control, and text input functions. This multi-functionality approach reduces the number of separate components needed, directly addressing the thickness reduction goal.

The fingerprint sensor is nested within the key structure, with the sensor active area embedded in the key surface. The sensor housing is integrated into the key's internal structure, allowing the fingerprint reading functionality to be contained within the existing key volume rather than adding external thickness. This nesting approach enables I/O consolidation while minimizing the increase in key structure thickness.

The patent utilizes the vertical dimension of the key structure efficiently by placing the fingerprint sensor at different depth levels within the key. The sensor is positioned beneath the key surface but above the key switch mechanism, effectively using the available vertical space without requiring additional horizontal or lateral thickness. This dimensional optimization allows integration of fingerprint functionality within the normal key thickness range.