公开(公告)号：US11886253B1

公开(公告)日：2024-01-30

申请号：US16289607

申请日：2019-02-28

Applicant: Apple Inc.

Inventor： John C. Difonzo ,  Hao Zhu ,  Bryce W. Wilson ,  Andrea Del Prete ,  Stefano Tizianel ,  Noemi Novello ,  Maurizio Bertoldo

IPC: G06F1/16 ,  H01F13/00 ,  H01F7/02

CPC classification number: G06F1/1679 ,  G06F1/1616 ,  H01F7/0263 ,  H01F13/006

Abstract: This application relates to improving kinematics in a computing device such as a laptop computer. A magnetic latch mechanism includes a magnetic array and an attractor plate. The magnetic array is secured in a top portion of the laptop computer and the attractor plate is secured in a base portion of the laptop computer. An attractive force of the magnetic latch mechanism is calibrated by selectively demagnetizing a portion of one or more magnetic elements in the magnetic array to reduce the attractive force proximate a target force. The calibration technique can include exciting a demagnetizing element, such as a pair of conductive coils, with a short, high frequency demagnetization pulse to create a demagnetized zone within the magnetic array that is completely demagnetized, irrespective of unit to unit variations of magnetic properties in the initially magnetized magnetic array. This technique ensures an accurate kinematic user experience.