A liquid discharge head substrate, comprising a discharging element configured to discharge a liquid, a driver configured to drive the discharging element, a conductive protection film covering the discharging element via an insulating film, and a controller connected to the protection film and configured to output a control signal that sets the driver in an inactive state when a change of a voltage of the protection film or a change in a current that flows to the protection film is detected.

An image processing device includes a heating unit, a memory, and a control unit. The heating unit heats a sheet at a temperature which is determined in each type of job in processing of a job related to image processing. The memory stores a type of job, and the number of sheets which is processed in the job, in each of job which is not executed yet. The control unit rearranges an executing order of jobs which are not executed yet so that jobs of the same type are continuously performed, when there is a job of which the number of sheets to be processed in one job is larger than the predetermined number of sheets.

An inkjet printing system includes: (a) an inkjet printhead having a rigid elongate manifold with first and second parallel ink supply channels extending along a length of the manifold between respective ink ports positioned at opposite ends thereof; and a plurality of printhead chips mounted to a lower surface of the manifold, the ink supply channels supplying ink to the printhead chips via ink outlets defined in the lower surface. One end of the manifold has a first ink inlet port for the first ink supply channel and an ink outlet port for the second ink supply channel. The other end of the manifold has a first ink outlet port for the first ink supply channel and a second ink inlet port for the second ink supply channel. An ink delivery system is configured to flow ink along the first and second channels in opposite directions.

An image processing device includes a heating unit, a memory, and a control unit. The heating unit heats a sheet at a temperature which is determined in each type of job in processing of a job related to image processing. The memory stores a type of job, and the number of sheets which is processed in the job, in each of job which is not executed yet. The control unit rearranges an executing order of jobs which are not executed yet so that jobs of the same type are continuously performed, when there is a job of which the number of sheets to be processed in one job is larger than the predetermined number of sheets.

A recording element substrate includes: a plurality of discharging ports; a plurality of nozzles connected to the plurality of discharging ports respectively; a passage forming portion in which a plurality of individual passages connected to the plurality of nozzles respectively and a common passage connected to the plurality of individual passages are formed; a plurality of supply ports disposed at positions corresponding to a plurality of nozzle groups on the common passage respectively along an array direction of the plurality of discharging ports; and a plurality of supply passages which extend from the plurality of supply ports to a rear surface of the recording element substrate in a direction intersecting with the rear surface. A plurality of heaters configured to heat liquid flowing through the common passage are provided for each of the plurality of supply ports along at least a part of a peripheral edge of the supply port.

A printer includes a clear ink tank, a color ink tank, a clear ink injection head, a color ink injection head, a light source, and a controller. The controller includes a matte printing controller structured or programmed to cause clear ink to be injected from the clear ink injection head and to be irradiated by the light source to form a matte clear ink layer on a recording medium; and a color printing controller structured or programmed to cause color ink to be injected from the color ink injection head to form a color ink layer on the clear ink layer.

A head module includes at least two liquid discharge heads, a reservoir, a heater, an inlet, a first outlet, a second outlet, and a wall member. The liquid discharge heads discharge liquid. The reservoir stores the liquid. The heater heats the liquid in the reservoir. The liquid is to be introduced from the inlet into the reservoir. The liquid in the reservoir is to be delivered from the first outlet to one of the liquid discharge heads. The liquid in the reservoir is to be delivered from the second outlet to another of the liquid discharge heads. A distance between the inlet and the first outlet is shorter than a distance between the inlet and the second outlet. The wall member is interposed between the inlet and the first outlet.

In order to keep possible local temperature differences in a liquid ejection head small to allow stable liquid ejection performance to be achieved, temperatures in a plurality of heating areas in a liquid ejection head are discretely controlled using heating elements and temperature detection elements.

An image processing device includes a heating unit, a memory, and a control unit. The heating unit heats a sheet at a temperature which is determined in each type of job in processing of a job related to image processing. The memory stores a type of job, and the number of sheets which is processed in the job, in each of job which is not executed yet. The control unit rearranges an executing order of jobs which are not executed yet so that jobs of the same type are continuously performed, when there is a job of which the number of sheets to be processed in one job is larger than the predetermined number of sheets.

According to one embodiment, a tablet printing apparatus includes: a conveying path where a tablet is conveyed; a drying device configured to dry the tablet in the conveying path; and a print head device located on the downstream side of the drying device in the conveying path. The print head device is configured to perform printing on the tablet dried by the drying device.