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US 7,246,890 B2Granted
Detection device for detecting ejection condition of nozzles
AssigneeRicoh Printing Systems, Ltd.
InventorsTakahiro Yamada, Shinya Kobayashi, Hitoshi Kida, Kunio Satou
Life of this patent
Estimating the term…
Abstract
When an refresh ink droplet ejected from a nozzle and deflected by an inclined electric field impinges on a orifice electrode/ink receiving member, electric charge is discharged from the refresh ink droplet, thereby an electric current is generated. A current-voltage converter/amplifier detects the electric current and outputs a detection signal. A defective-condition determining circuit determines an ejection condition of a nozzle element based on voltage value of the detection signal.
Claims26
A detection device for detecting ejection condition of an ejection member of a drop-on-demand type inkjet recording device, the detection device comprising:
- a controller that controls the ejection member to eject a recording ink droplet or a refresh ink droplet, the recording ink droplet impinging on a recording medium;
- a collector that collects the refresh ink droplet;
- a deflection means that deflects at least the refresh ink droplet such that the deflected refresh ink droplet impinges on the collector, the refresh ink droplet being deflected by a greater amount than the recording ink droplet when a deflection power is applied to each of the refresh ink droplet and the recording ink droplet;
- and
- a detecting means that detects an ejection condition of the ejection member based on a condition of the refresh ink droplet as the refresh ink droplet is collected by the collector during impingement thereon as deflected by the deflection means.
2 more elements
A drop-on-demand inkjet recording device comprising:
- an ejection member for ejecting a refresh ink droplet;
- a controller that controls the ejection member to eject a recording ink droplet or the refresh ink droplet, the recording ink droplet impinging on a recording medium;
- a collector that collects the refresh ink droplet;
- a deflection means that deflects at least the refresh ink droplet such that the deflected refresh ink droplet impinges on the collector, the refresh ink droplet being deflected by a greater amount than the recording ink droplet when a deflection power is applied to each of the refresh ink droplet and the recording ink droplet;
- and
- a detecting means that detects an ejection condition of the ejection member based on a condition of the refresh ink droplet as the refresh ink droplet is collected by the collector during impingement thereon as deflected by the deflection means.
3 more elements
A drop-on-demand type inkjet recording device comprising:
- an ejection member that ejects a refresh ink droplet;
- a controller that controls the ejection member to eject the refresh ink droplet, said refresh ink droplet differing in weight, mass or speed from a recording ink droplet;
- a collector that collects the refresh ink droplet;
- a deflection member that deflects the refresh ink droplet in a manner different from a said recording ink droplet such that the deflected refresh ink droplet impinges on the collector;
- and
- a detecting member that detects a defective condition of the ejection member based on the refresh ink droplet.
3 more elements
A detection device for detecting ejection condition of an ejection member of a drop-on-demand type inkjet recording device, the detection device comprising:
- a controller that controls the ejection member to eject a recording ink droplet or a refresh ink droplet, said recording ink droplet being ejected from the ejection member with different weight, mass or speed from said refresh ink droplet;
- a collector that collects the refresh ink droplet;
- a deflection means that deflects at least the refresh ink droplet such that the deflected refresh ink droplet impinges on the collector and the recording ink droplet impinges on a recording medium;
- and
- a detecting means that detects an ejection condition of the ejection member based on a condition of the refresh ink droplet as the refresh ink droplet is collected by the collector during impingement thereon as deflected by said deflection means.
2 more elements
A drop-on-demand inkjet recording device comprising:
- an ejection member for ejecting recording ink droplet or a refresh ink droplet;
- a controller that controls the ejection member to eject the recording ink droplet or the refresh ink droplet, said recording ink droplet being ejected from the ejection member with different weight, mass or speed from said refresh ink droplets;
- a collector that collects the refresh ink droplet;
- a deflection means that deflects at least the refresh ink droplet such that the deflected refresh ink droplet impinges on the collector and the recording ink droplet impinges on a recording medium;
- and
- a detecting means that detects an ejection condition of the ejection member based on a condition of the refresh ink droplet as the refresh ink droplet is collected by the collector during impingement thereon as deflected by said deflection means.
3 more elements
A detection device for detecting ejection condition of an ejection member of a drop-on-demand type inkjet recording device, the detection device comprising:
- a controller that controls the ejection member to eject a recording ink droplet or a refresh ink droplet, the recording ink droplet being ejected from the ejection member with different weight, mass or speed from the refresh ink droplet, and impinging on a recording medium;
- a collector that collects the refresh ink droplet;
- a deflection means that deflects at least the refresh ink droplet such that the deflected refresh ink droplet impinges on the collector;
- and
- a detecting means that detects an ejection condition of the ejection member based on a condition of the refresh ink droplet as the refresh ink droplet is collected by the collector during impingement thereon as deflected by the deflecting means.
2 more elements
A drop-on-demand inkjet recording device comprising:
- an ejection member for ejecting a refresh ink droplet;
- a controller that controls the ejection member to eject a recording ink droplet or a refresh ink droplet, the recording ink droplet being ejected from the ejection member with different weight, mass or speed from the refresh ink droplet, and impinging on the recording medium;
- a collector that collects the refresh ink droplet;
- a deflection means that deflects at least the refresh ink droplet such that the deflected refresh ink droplet impinges on the collector;
- and
- a detecting means that detects an ejection condition of the ejection member based on a condition of the refresh ink droplet as the refresh ink droplet is collected by the collector during impingement thereon as deflected by the deflecting means.
3 more elements
Dependencies are inferred from the claim text.