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:
Oct. 31, 1995
Filed:
Jun. 03, 1993
May F Ho, La Mesa, CA (US);
Ellen Tappon, Corvalis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A 'barrier reef' configuration, comprising a plurality of cays, or pillars, is provided, each pillar associated with the entrance to a firing chamber in a thermal ink-jet printhead. Each firing chamber is formed in a photopolymer layer, together with an associated barrier inlet channel that fluidically communicates with a common ink refill channel which acts as a common reservoir to the each firing chamber, in which resides a resistor element. When energized, the resistor element fires a droplet of ink toward a print medium. Over each resistor element is a nozzle, formed in an orifice plate, for firing the droplets of ink orthogonal to the resistor element. The pillars, which are positioned near the ink refill channel, serve to support the orifice plate and act as pillars between the substrate and the orifice plate, thereby avoiding any pinching effect that would otherwise occur for an unsupported region. Advantageously, the pillars are spaced apart by an amount equal to the smallest dimension of the system and are placed as close as possible to a common ink feed channel so as to keep contaminant particles outside the firing chamber and in the common ink feed channel region.