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:
Jun. 09, 1981
Filed:
Nov. 02, 1978
Walter H Hehl, Steinenbronn, DE;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for driving a matrix printer element is described which utilizes a piezoelectrically driven horn loaded driver. The horn is preferably tapered in the direction of the printing element and has a base area to which is attached a piezoelectric crystal excitation device. The piezoelectric crystal structure is driven by electric pulses which are coupled to the tapered horn to increase the impact velocity and stroke at the output end of the horn. The piezoelectric crystals may be controlled by the application of a particular pulse pattern to reduce resonance and insure an optimum deceleration of the crystal during rebound of the printing element.