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:
Feb. 02, 1999
Filed:
Dec. 19, 1997
Hiroyuki Kishishita, Fukui-ken, JP;
Yukinori Ueda, Fukui-ken, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Abstract
In a variable capacitor having a stator with a stator electrode and a rotor with a rotor electrode both of which are housed in a recess section of a casing while allowing the recess section to be closed by a cover, enabling the rotor to be brought into stable close contact with the stator. To this end, a cover (46) made of a chosen metal includes a cover main body (55) which covers the upper opening of a recess section (45) except for an adjustment hole (54) that exposes a driver groove (30) of the rotor (43), leg sections (56, 57) which engage a casing (44) letting the cover main body (55) be secured to the casing (44), and a rotor terminal. The cover main body (55) has a size corresponding to the outer diameter of the variable capacitor (41). This cover main body (55) may have a vent shape so as to create intended elastic force which may act to compress the rotor (43) against the stator (42). More preferably, a spring washer (60) is provided which integrally extends from the cover main body (55) and is folded so that it is placed between the cover main body (55) and the rotor (43).