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:
Feb. 05, 1985
Filed:
Jul. 22, 1982
Applicant:
Inventor:
Yoshio Kanayama, Nabari, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
3461 / ; 364518 ;
Abstract
An air bubble detection system is provided for detecting air bubbles contained in an ink liquid disposed in a printer head of an ink jet system printer of the ink on demand type. The air bubble detection system includes a driver circuit for activating a piezoelectric transducer attached to a pressure chamber, thereby creating an initial oscillation in the ink liquid. The air bubble detection system further includes a sensing circuit for sensing a residual oscillation of the ink liquid after termination of the initial oscillation. When air bubbles are contained in the ink liquid, a high frequency component is included in an output signal obtained by the sensing circuit.