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. 21, 2020
Filed:
Jun. 29, 2017
Denso Corporation, Kariya, Aichi-pref., JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Yuichi Takeuchi, Kariya, JP;
Shuhei Mitani, Kariya, JP;
Katsumi Suzuki, Toyota, JP;
Yusuke Yamashita, Nagakute, JP;
DENSO CORPORATION, Kariya, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
The width of the p type guard ring is set to match the interval between the adjacent p type guard rings, and the width of the p type guard ring is made larger as the interval between the p type guard rings becomes larger. The width of the frame portion is basically equal to the width of the p type deep layer so that the interval between the frame portions is equal to the interval between the p type deep layers. This makes it possible to reduce the difference in formation areas of the trenches per unit area in the cell portion, the connection portion and the guard ring portion. Therefore, when the p type layer is formed, the difference in the amount of the p type layer embedding into the trenches per unit area also decreases and the thickness of the p type layer is equalized.