The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 2025
Filed:
May. 21, 2021
Pick and placement of semiconductor chips based on nozzleless self-focusing acoustic droplet ejector
University of Southern California, Los Angeles, CA (US);
Eun Sok Kim, Rancho Palos Verdes, CA (US);
Yongkui Tang, Pasadena, CA (US);
University of Southern California, Los Angeles, CA (US);
Abstract
A device for picking and placing semiconductor chips includes a liquid having a first surface and a second surface and a layer of semiconductor chips disposed over the first surface. Characteristically, the first surface is a liquid-air interface. The device also includes a focused ultrasonic transducer positioned to focus acoustic wave on the layer of semiconductor chips such that a droplet including at least one semiconductor chip is ejected through the liquid-air per each actuation of the focused ultrasonic transducer through droplet ejection. The focused ultrasonic transducer includes a piezoelectric substrate having a top face and a bottom face, a Fresnel acoustic lens including a plurality of annular rings of air cavities disposed on the top face, and a first patterned circular electrode disposed over the top face and a second patterned circular electrode disposed over the bottom face. The first patterned circular electrode overlaps the second patterned circular electrode.