Invention Grant
- Patent Title: Method of inspecting the nozzle discharge state, a discharge state inspection method, and a fluid discharge device
- Patent Title (中): 检查喷嘴排出状态的方法,排出状态检查方法和流体排出装置
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Application No.: US12436381Application Date: 2009-05-06
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Publication No.: US07992957B2Publication Date: 2011-08-09
- Inventor: Hiroyuki Motoyama , Kiyomi Kuroda , Satoshi Inomata
- Applicant: Hiroyuki Motoyama , Kiyomi Kuroda , Satoshi Inomata
- Applicant Address: JP Tokyo
- Assignee: Seiko Epson Corporation
- Current Assignee: Seiko Epson Corporation
- Current Assignee Address: JP Tokyo
- Priority: JP2008-121932 20080508
- Main IPC: B41J29/393
- IPC: B41J29/393

Abstract:
A method of inspecting a discharge state of a nozzle prevents wrongly determining that discharge is normal even though fluid droplets are not discharged normally. In a fluid droplet discharge device such as an inkjet printer, a momentary induced current is produced when a charged ink droplet 17c lands on a head cap 31 with a potential difference. A voltage change detection unit 39 detects the induced current as a voltage change. A decision unit 40 determines that the ink discharge state is normal if the maximum amplitude L of the voltage change detected by the voltage change detection unit 39 in a first period S is greater than or equal to a first threshold value Q. If the amplitude of voltage change detected in a third period U after the specific period has passed goes to a second threshold value R, a decision cancellation unit 41 determines that noise is contained in the voltage change. If the ink discharge state is determined to be normal and noise is determined to be contained in the voltage change, inspection is repeated and the normal discharge decision is cancelled.
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