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:
Apr. 29, 2003
Filed:
Dec. 19, 2001
Masahiro Aoki, Miyagi-ken, JP;
Makoto Sasaki, Miyagi-ken, JP;
Hitoshi Kitagawa, Miyagi-ken, JP;
Hirofumi Fukui, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A temperature-compensating thin-film capacitor includes a first dielectric thin-film having a specific inductive capacity of 4.0 or less and a linear thermal expansion coefficient of 50 ppm/° C. or more, and includes a second thin-film capacitor having capacitance-temperature coefficient with an absolute value of 50 ppm/° C. or less, in which the first and the second dielectric thin-films are placed between electrodes. The present thin-film capacitor design significantly reduces variations in capacitance due to manufacturing equipment tolerance. Also, miniaturization, thinning, and lightening of the thin-film capacitor is achieved. In another aspect of the invention, an electronic device having the temperature-compensating thin-film is provided. The temperature stability of the present thin-film capacitor is highly advantageous for incorporation into electronic devices such as a portable electronic device, microwave communication equipment.