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:
Nov. 08, 2022
Filed:
Feb. 26, 2020
Shanghai Fusion Tech Co., Ltd., Shanghai, CN;
Xi Cao, Shanghai, CN;
Hua Feng, Shanghai, CN;
Jianzhe Li, Shanghai, CN;
Jinjing Zhang, Shanghai, CN;
Wangping Long, Shanghai, CN;
Xiaoyu Wu, Shanghai, CN;
Zhongwei Yu, Shanghai, CN;
Xingpeng Fan, Shanghai, CN;
Rui Yuan, Shanghai, CN;
Huan Liu, Shanghai, CN;
Shanghai Fusion Tech Co., Ltd., Shanghai, CN;
Abstract
Some embodiments of the disclosure provide a flatness detection device. In an embodiment, the flatness detection device includes a back plate, an electromagnet, a cross beam, a probe, and a limiting frame. The limiting frame and the electromagnet are provided side by side on the back plate. The cross beam is located above the limiting frame and the electromagnet. The probe vertically penetrates the cross beam and the limiting frame. A spring is provided between the cross beam and the electromagnet. The spring is movable in a vertical direction by a guide, the movement being at least one of compression and extension.