公开(公告)号：US20210084784A1

公开(公告)日：2021-03-18

申请号：US16869061

申请日：2020-05-07

Applicant: Apple Inc.

Inventor： Hoishun LI ,  Zechariah D. FEINBERG ,  Theodore A. WANIUK

IPC: H05K5/04 ,  C23C14/08

Abstract: This application relates to a portable electronic device. The portable electronic device includes an enclosure having a metal oxide coating, the metal oxide coating including a metal alloy substrate that is doped with a dopant, and a metal oxide layer overlaying and formed from the metal alloy substrate so that the metal oxide layer includes the dopant.

公开(公告)号：US20230351797A1

公开(公告)日：2023-11-02

申请号：US18331867

申请日：2023-06-08

Applicant: Apple Inc.

Inventor： Daniel J. HIEMSTRA ,  George Ho Yin MAK ,  Ehsan KHAJEH ,  Hoishun LI

IPC: G10K11/02 ,  G06V40/13 ,  G06F3/041 ,  G06F3/043

CPC classification number: G06V40/1306 ,  G06F3/0412 ,  G06F3/0436 ,  G10K11/02

Abstract: Improving the accuracy of ultrasonic touch sensing and fingerprint imaging using acoustic impedance matching is disclosed. Acoustic impedance mismatches between an ultrasonic transducer array and a sensing plate can be reduced to maximize energy transfer and minimize parasitic reflections. A reduction in acoustic impedance mismatches can be accomplished using (i) a composite epoxy having a higher acoustic impedance than epoxy alone, (ii) one or more matching layers having an acoustic impedance that is approximately the geometric mean of the acoustic impedance of the sensing plate and the acoustic impedance of the transducer array, (iii) pores or perforations in the sensing plate, or (iv) geometric structures formed in the sensing plate. In addition, parasitic reflections can be suppressed using an absorbent layer.