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:
Mar. 29, 2005
Filed:
Sep. 07, 2001
Tsuneo Kyouno, Adachi-ku, Tokyo, JP;
Teruo Yoshinari, Adachi-ku, Tokyo, JP;
Minoru Ueda, Adachi-ku, Tokyo, JP;
Tsuneo Kyouno, Adachi-ku, Tokyo, JP;
Teruo Yoshinari, Adachi-ku, Tokyo, JP;
Minoru Ueda, Adachi-ku, Tokyo, JP;
Other;
Abstract
An improved electromagnetic actuator having a coil () on which a current is impressed, a magnet () that forms a magnetic circuit across a magnetic gap (G) with a magnet yoke (), and having a diaphragm () that vibrates when a high-frequency current is impressed, and a vibration plate () that vibrates when a low-frequency current is impressed, with these parts enclosed within a basket () and the coil () placed within the magnetic gap (G). As one invention, a radial array of magnets, a vibration plate with a double-suspension structure, and a bottom plate of magnetic shielding material are placed in the basket to suppress the leakage of magnetic flux. As an invention to further improve the frequency characteristics by means of the mounting structure of the electromagnetic actuator, elastic packing () is sandwiched between the basket of the electromagnetic actuator and the housing case of the portable electronic equipment, and also between the basket of the electromagnetic actuator and the mounting.