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. 31, 2001
Filed:
Oct. 19, 1998
Shigeru Furuki, Fukushima-ken, JP;
Alps Electric Co. Ltd., Tokyo, JP;
Abstract
A vibration generation apparatus allows vibration frequency and amplitude to be independently controlled and to produce various modes of vibration involving shocks in addition to simple modes of vibration. The apparatus comprises a coil and a vibratory assembly comprising a-yoke providing a magnetic circuit, the coil being supplied with a drive current for a rectangular pulse of a constant peak value to cause the vibratory assembly to vibrate such that the amplitude of the vibration assembly corresponds to the duration of the rectangular-pulse drive current. The vibration generation apparatus allows the frequency and the duration of the rectangular-pulse drive current to be varied independently of each other.