There is provided a liquid discharge apparatus. A discharge head is provided with a discharge port that discharges a liquid. A retention portion is facing the discharge head, and retains the liquid between the discharge head and the retention portion. A detection unit detects that the discharge port is covered with the liquid after the liquid is supplied between the discharge head and the retention portion.

An inkjet recording device and a method for controlling an inkjet recording device are provided. A heating device that heats the ink to be supplied to a nozzle immediately ahead of the nozzle, a thermometer that detects a temperature of the ink inside the heating device or after heating, a viscometer that detects a viscosity of the ink in a main ink container are provided. The heating device is driven using a detection value of the thermometer to control the temperature of the ink such that the viscosity reaches an ink viscosity which enables normal printing, and when the viscosity of the ink is out of a range which enables printing, the solvent or the replenishment ink is supplied to the main ink container using a detection value of the viscometer such that the viscosity reaches the range which enables normal printing.

An inkjet recording device and a method for controlling an inkjet recording device are provided. A heating device that heats the ink to be supplied to a nozzle immediately ahead of the nozzle, a thermometer that detects a temperature of the ink inside the heating device or after heating, a viscometer that detects a viscosity of the ink in a main ink container are provided. The heating device is driven using a detection value of the thermometer to control the temperature of the ink such that the viscosity reaches an ink viscosity which enables normal printing, and when the viscosity of the ink is out of a range which enables printing, the solvent or the replenishment ink is supplied to the main ink container using a detection value of the viscometer such that the viscosity reaches the range which enables normal printing.

An inkjet printing device includes an ink reservoir that stores ink containing particles, an inkjet head part that receives the ink from the ink reservoir and ejects the ink onto a target substrate and a driver for rotating the ink reservoir.

An inkjet printing device includes an ink reservoir that stores ink containing particles, an inkjet head part that receives the ink from the ink reservoir and ejects the ink onto a target substrate and a driver for rotating the ink reservoir.

A discharge head includes an orifice surface in which orifices each configured to discharge a droplet are arrayed in a predetermined direction. A detecting unit includes a light emitting element and a light receiving element, and optically detects a droplet discharged from the orifice. A suppression unit is arranged between the light emitting element and the orifice surface, and suppresses the light emitted from the light emitting element from reaching the orifice surface by shielding at least some rays of the light which is emitted from the light emitting element and propagates to the orifice surface.

A discharge head includes an orifice surface in which orifices each configured to discharge a droplet are arrayed in a predetermined direction. A detecting unit includes a light emitting element and a light receiving element, and optically detects a droplet discharged from the orifice. A suppression unit is arranged between the light emitting element and the orifice surface, and suppresses the light emitted from the light emitting element from reaching the orifice surface by shielding at least some rays of the light which is emitted from the light emitting element and propagates to the orifice surface.

A drop detector calibration system may include a fluid ejection bar, a drop detector movable along the fluid ejection bar at different spacings from the fluid ejection bar and a controller to determine a location of the fluid ejection bar based upon interaction between the fluid ejection bar and the drop detector during movement of the drop detector along the fluid ejection bar.

To realize high-quality printing with less printing distortion by reducing an influence of a Coulomb force that acts between ink particles which are ejected in an inkjet recording device.

The inkjet recording device is configured to charge ink particles ejected from a nozzle, deflect the charged ink particles, and print a character in a shape of an object to be printed. In the inkjet recording device, dots of each column of the character to be printed are divided into a plurality of blocks in a column direction. In addition, charging voltage data in which the order of the ink particles corresponding to the dots is switched in the divided block unit is stored, and a predetermined charging voltage is applied to the charging electrode on the basis of the charging voltage data.

A printer includes: a carriage which moves with a print head mounted thereon, the print head being configured to eject ink; a camera attached to the carriage and configured to capture an image printed on a print medium by the print head; a movement mechanism configured to move the carriage along a main scan direction; a transportation mechanism configured to transport the print medium along a sub-scan direction; a processor configured to control printing of the image onto the print medium; and a storage configured to store a correction value of a movement amount of the movement mechanism as a first correction value for a location adjustment of a capture area of the camera and store a correction value of a transportation amount of the transportation mechanism as a second correction value for the location adjustment of the capture area.