A thermal head includes a substrate, a heat-generating portion, electrodes, and a protective layer. The heat-generating portion is located on the substrate. The electrodes are located on the substrate and are connected to the heat-generating portion. The protective layer covers the heat-generating portion and parts of the electrodes. Further, a kurtosis Rku of the protective layer is smaller than 3. A thermal head includes a substrate, a heat-generating portion, electrodes, and a protective layer. The heat-generating portion is located on the substrate. The electrodes are located on the substrate and are connected to the heat-generating portion. The protective layer covers the heat-generating portion and parts of the electrodes. Further, a skewness Rsk of the protective layer is smaller than 0.

A printer printing an image on a print medium based on print data including print dot data for each of print lines. The printer includes a print head including heating elements arranged along a direction of the print lines, and a controller finding the number of print dots on each print line and determining a first or second control mode as a control mode of the heating elements for printing each print line based on the found number of print dots. In the first control mode, the heating elements are divided into first groups including two or more adjacent heating elements and are heated at a different timing. In the second control mode, the heating elements are divided into second groups including two or more heating elements with at least two thereof spaced apart and are heated at a different timing.

The present disclosure includes a method of fabricating a thermal ink jet printhead including depositing a first metal layer having a thickness to form a power bus, deposing a first dielectric layer, forming a via in the first dielectric layer to connect the first metal layer to a second metal layer, depositing the second metal layer, depositing a resistive layer, forming a thermal resistor in the resistive layer, depositing a second dielectric layer, and removing a portion of the second dielectric layer.

A thermal head includes a substrate, a heat-generating portion, electrodes, and a protective layer. The heat-generating portion is located on the substrate. The electrodes are located on the substrate and are connected to the heat-generating portion. The protective layer covers the heat-generating portion and parts of the electrodes. Further, a kurtosis Rku of the protective layer is smaller than 3. A thermal head includes a substrate, a heat-generating portion, electrodes, and a protective layer. The heat-generating portion is located on the substrate. The electrodes are located on the substrate and are connected to the heat-generating portion. The protective layer covers the heat-generating portion and parts of the electrodes. Further, a skewness Rsk of the protective layer is smaller than 0.

A thermal head of the present disclosure includes a substrate, a heat-generating portion, electrodes, and a protective layer. The heat-generating portion is located on the substrate. The electrodes are located on the substrate and are connected to the heat-generating portion. The protective layer covers the heat-generating portion and parts of the electrodes. A skewness Rsk of the protective layer is larger than 0. Further, A thermal head of the present disclosure includes a substrate, a heat-generating portion, electrodes, and a protective layer. The heat-generating portion is located on the substrate. The electrodes are located on the substrate and are connected to the heat-generating portion. The protective layer covers the heat-generating portion and parts of the electrodes. A kurtosis Rku of the protective layer is larger than 3.

[Object] To provide a thermal head with which a substrate is not likely to become broken.

[Solution] A thermal head X1 includes a substrate 7 having a first main surface 7f and an end surface 7e adjacent to the first main surface 7f; a plurality of heating elements 9 disposed on the first main surface 7f or on the end surface 7e; a plurality of electrodes disposed on the first main surface 7f and electrically connected to the plurality of heating elements 9; a first covering layer 27a disposed on parts of the plurality of electrodes; a connector 31 disposed adjacent to the end surface 7e and including a plurality of connector pins 8 disposed on the plurality of electrodes and a housing 10 containing the plurality of connector pins 8; and a covering member 12 covering the plurality of connector pins 8 on the plurality of electrodes together with the plurality of electrodes. The thermal head further includes a second covering layer 27b extending from the first covering layer 27a onto the end surface 7e. The housing 10 is in contact with the second covering layer 27b. Thus, the probability of breakage of the substrate 7 can be reduced.

[Object] To provide a thermal head that can reduce the probability of breakage of a connector.

[Solution] A thermal head X1 includes a substrate 7; a plurality of heating elements 9 disposed on the substrate 7; a plurality of electrodes disposed on the substrate 7 and electrically connected to the plurality of heating elements 9; a connector 31 disposed adjacent to the substrate 7 and including a plurality of connector pins 8a including connection portions 32, each of which is electrically connected to a corresponding one of the plurality of electrodes, and a housing 10 containing the plurality of connector pins 8a; and a covering member 12 covering the connection portions on the substrate. The housing includes an opening facing away from the substrate. The covering member 12 includes a first portion 12a located on the substrate 7 and a second portion 12b located on the housing 10. The second portion 12b includes a first protrusion 12b1 protruding toward the opening 10i in a plan view. Thus, the probability of breakage of the connector can be reduced.

A thermal head includes a substrate; a plurality of heat generating portions; a common electrode disposed on the substrate and electrically connected to the plurality of heat generating portions; a plurality of individual electrodes disposed on the substrate and each electrically connected to a corresponding one of the plurality of heat generating portions; a first insulation layer disposed on the heat generating portions, a part of the common electrode, and a part of the individual electrodes; a second insulation layer located adjacent to the first insulation layer and disposed on a part of the individual electrodes; and a static removing layer disposed on the first insulation layer and grounded. The static removing layer includes a first portion disposed on an upper surface of the first insulation layer and a second portion electrically connected to the first portion and disposed on an upper surface of the second insulation layer.

A thermal head includes a substrate, a plurality of heat generating portions, electrodes, pads, driving ICs, and a wire. The plurality of heat generating portions are positioned on the substrate and arranged in a main scanning direction. The electrodes are positioned on the substrate and electrically coupled to each of the plurality of heat generating portions. The pads are positioned on the substrate and coupled to the electrodes. The driving ICs drive the heat generating portions. The wire couples the driving ICs and the electrodes to each other. The thermal head according to the present disclosure includes a plurality of the pads. At least one of the pads is a multi pad that has a first region to which the wire is connected and a second region to which each of a plurality of probes is connected.

A thermal head according to the present disclosure includes a substrate, a plurality of heat generating portions, a plurality of first electrodes, and a second electrode. The plurality of heat generating portions are located on the substrate. The plurality of first electrodes are located on the substrate and respectively connected to the plurality of heat generating portions. The second electrode is located on the substrate and is located across the plurality of first electrodes. The second electrode includes protruding portions protruding in a first direction from the second electrode toward corresponding ones of the first electrodes and being in contact with the corresponding ones of the first electrodes.