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:
May. 24, 2005
Filed:
Jul. 19, 2002
Hirofumi Teramae, Nagano, JP;
Satoru Hosono, Nagano, JP;
Hironori Endo, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
In an apparatus for measuring an ejection velocity of a liquid droplet ejected from a nozzle orifice of a head device which is provided with a pressure chamber communicated with the nozzle orifice and an actuator which varies pressure of liquid contained in the pressure chamber, a driver generates a drive signal to drive the actuator to eject a liquid droplet from the nozzle orifice. A photo emitter emits a light beam so as to intersect a space through which the liquid droplet passes. A photo receiver receives the light beam which has been passed through the space. A calculator calculates an ejection velocity of the liquid droplet based on a timing at which the actuator is driven and a change in a photo-receiving state of the photo receiver.