公开(公告)号：US11460933B2

公开(公告)日：2022-10-04

申请号：US17031549

申请日：2020-09-24

Applicant: Apple Inc.

Inventor： Daniel Jacob Benjamin Bechstein ,  John Stephen Smith ,  Siddharth Shekar ,  Teera Songatikamas ,  Elvis Mwenda Kibiti ,  Jared A. Brauner ,  Lindsay Diane Rego Corbet ,  Wang Chung Alston Cheung ,  Vipin Ayanoor-Vitikkate ,  Nitin Sitaraman ,  Joyan Gratian Sanctis ,  Blake R. Marshall

IPC: G06F3/0354 ,  G06F3/038 ,  G06F3/044

Abstract: In some examples, a stylus can include a conductive shield. In some examples, the conductive shield can include a plurality of traces along an edge of a printed circuit board (PCB) including the stylus circuitry. In some examples, the conductive shield can include a shield can coupled to the PCB and disposed around the components of the stylus circuitry. In some examples, the conductive shield can include a hollow portion into which the stylus circuitry can be disposed and a solid portion that can act as a reference electrode. In some examples, the conductive shield can include a hollow sleeve disposed around the stylus circuitry. In some examples, the conductive sleeve can be attached to the PCB. In some examples, the conductive sleeve can be disposed between layers of a housing of the stylus. In some examples, the conductive sleeve can be integrated with the stylus housing.

公开(公告)号：US11526240B1

公开(公告)日：2022-12-13

申请号：US17448774

申请日：2021-09-24

Applicant: Apple Inc.

Inventor： Daniel Jacob Benjamin Bechstein ,  Ullas Chandra Sekhar Pazhayaveetil ,  Jason Chueh-Ren Hu ,  Robert Ubo Liu ,  Rexford J. Garland ,  John Stephen Smith ,  Blake R. Marshall

IPC: G06F3/044 ,  H01L29/872 ,  G06F3/0354 ,  G06F3/041

Abstract: An input device such as a stylus for providing input to a touch-sensitive surface with reduced sensitivity to leakage current variations over temperature is disclosed. A passive stylus may include one or more diodes in parallel with one or more bleed resistors. The non-linear load of the diode and resistor network can be operative to provide a stylus electric field in response to a stimulation signal from an electronic device that can be capacitively coupled to, and sensed by, the electronic device. The signal sensed by the electronic device can be a function of the total leakage current, which can vary greatly as a function of temperature and frequency. In order to improve performance, the diode and resistor network, including the bleed resistor(s) and diodes within that network, can be selected and/or designed to provide a reduced variation in the leakage current and more accurate stylus detection.

公开(公告)号：US11997777B2

公开(公告)日：2024-05-28

申请号：US17031570

申请日：2020-09-24

Applicant: Apple Inc.

Inventor： Daniel Jacob Benjamin Bechstein ,  MohammadAli Khorrami ,  Vipin Ayanoor-Vitikkate ,  Blake R. Marshall ,  Zhibin Wang ,  Ying Cao ,  Robert Ubo Liu ,  John Stephen Smith

IPC: H05F3/00 ,  G06F3/0354 ,  G06F3/044

CPC classification number: H05F3/00 ,  G06F3/03545 ,  G06F3/0442 ,  G06F3/0446

Abstract: An electrostatic discharge (ESD) robust design for an input device such as a stylus is disclosed. The input device can include one or more components, such as one or more Schottky diodes, that can be damaged by ESD events. To reduce the likelihood of damage to sensitive components, the parasitic capacitance between sensitive conductive paths and reference ground paths of the input device that could otherwise provide electrostatic discharge paths can be reduced (arranging current limiting resistance at specific locations among sensitive components, creating physical separation between sensitive conductive paths and reference ground paths), shielding can be added to shield the sensitive electronics from ESD pulses, and high dielectric breakdown material can be added to prevent ESD pulse entry or exit of not otherwise protected circuit parts.