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. 02, 1985
Filed:
Jun. 01, 1982
Stuart D Howkins, Ridgefield, CT (US);
Exxon Research & Engineering Co., Florham Park, NJ (US);
Abstract
The transducer of a demand ink jet is driven by voltage so as to project a droplet of ink from the orifice of an ink chamber on demand. After the chamber of the jet has been filled, an abrupt change in drive voltage level of the transducer disturbs the meniscus of ink in the orifice of the jet so as to move the meniscus away from the chamber. When the meniscus has reached a predetermined position and velocity in the orifice, the drive voltage level supplied to the transducer is substantially changed so as to eject the droplet from the orifice. The change in drive voltage level is contoured so as to minimize high frequency components. An array of ink jets may be similarly driven where the differences from jet to jet are compensated by wave shaping including variations from jet to jet in the period of time between perturbation and the substantial voltage level change leading to droplet projection.