[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 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.

A printing device includes: a casing, a circuit board, an electrolytic capacitor, an explosion-proof valve, a first wall, a second wall, and a specific region. The electrolytic capacitor is connected to the circuit board. The electrolytic capacitor includes a sleeve portion containing electrolysis liquid therein and has an axis defining an axial direction. The sleeve portion has one end portion, another end portion, and a peripheral surface extending therebetween. The explosion-proof valve is provided at the one end portion. The first wall is disposed in the casing and faces the explosion-proof valve. The second wall extends from the first wall and faces at least a portion of the peripheral surface. The specific region is provided in the second wall and has one of a recessed portion and a protruding portion. The recessed portion is recessed away from the peripheral surface. The protruding portion protrudes toward the peripheral surface.

A printing device includes: a casing, a circuit board, an electrolytic capacitor, an explosion-proof valve, a first wall, a second wall, and a specific region. The electrolytic capacitor is connected to the circuit board. The electrolytic capacitor includes a sleeve portion containing electrolysis liquid therein and has an axis defining an axial direction. The sleeve portion has one end portion, another end portion, and a peripheral surface extending therebetween. The explosion-proof valve is provided at the one end portion. The first wall is disposed in the casing and faces the explosion-proof valve. The second wall extends from the first wall and faces at least a portion of the peripheral surface. The specific region is provided in the second wall and has one of a recessed portion and a protruding portion. The recessed portion is recessed away from the peripheral surface. The protruding portion protrudes toward the peripheral surface.

A thermal printer includes a conveyance unit, a thermal head with heating elements arranged in a line crossing a conveyance direction of a thermal paper, and a controller that generates print dot data for dots to be printed by the thermal head and controls the conveyance unit and thermal head according to the print dot data. The controller determines whether the total number of dots to be printed in a predetermined number of consecutive lines of the print dot data is greater than a threshold number and, when the total number of dots is greater than the threshold number, control the conveyance unit to convey the thermal paper after the printing of the print dot data by a predetermined amount along the conveyance direction.

A direct thermal printer prints on direct thermal printing paper, which has a thermo-reactive layer that can form two colors. A first color is formed at a first temperature, and a second at a second temperature, higher than the first. A printhead of the printer has heat sources arranged transversely to a paper path. Image data of an original image having at least the first color and the second color may be received. Control data may be created for the direct thermal printer for two-color printing of a print image. The control data has a plurality of print lines, and causes, for each print line for each heat source, either heating of the heat source to a printing temperature or no heating of the respectively heat source.

A direct thermal printer prints on direct thermal printing paper, which has a thermo-reactive layer that can form two colors. A first color is formed at a first temperature, and a second at a second temperature, higher than the first. A printhead of the printer has heat sources arranged transversely to a paper path. Image data of an original image having at least the first color and the second color may be received. Control data may be created for the direct thermal printer for two-color printing of a print image. The control data has a plurality of print lines, and causes, for each print line for each heat source, either heating of the heat source to a printing temperature or no heating of the respectively heat source.

A printing device is configured to print a multi-layer thermal printing medium. The printing device includes a thermal head and a controller. The thermal head has a heat generating elements configured to form images on a heat sensitive multi-layer. The controller is configured to perform detecting whether a viewing direction of the heat sensitive multi-layer is a thickness direction to view from a second surface toward a first surface or a direction opposite the thickness direction to view from the first surface toward the second surface. The controller is configured to further perform creating print data to be applied to each of the heat generating elements. The created print data is such that color development states of a first color and a second color according to the detected viewing direction are differentiated from color development states of the first color and the second color according to an undetected viewing direction.

The present invention provides a thermal print head capable of better performing printing on a printing medium; the thermal print head including: a substrate (1), formed with single crystal semiconductor; a resistor layer (4), including a plurality of heating portions (41) arranged in a main scan direction; and a wiring layer (3), configuring a charging path to the plurality of heating portions. The substrate includes: a main surface (11), being a surface opposite to the resistor layer; and a convex portion (13), disposed as protruding from the main surface and extending in the main scan direction. The convex portion includes: an inclining surface (132), inclining relative to the main surface and extending in a linear manner when viewing from the main scan direction; and a curving surface (131), disposed, in a protruding direction of the convex portion, on a position farther away from the main surface than the inclining surface, and curving in a manner that protrudes toward the protruding direction. Each of the plurality of heating portions includes a heating curving portion (411) formed on a portion corresponding to the curving surface.

The present invention provides a thermal print head capable of better performing printing on a printing medium; the thermal print head including: a substrate (1), formed with single crystal semiconductor; a resistor layer (4), including a plurality of heating portions (41) arranged in a main scan direction; and a wiring layer (3), configuring a charging path to the plurality of heating portions. The substrate includes: a main surface (11), being a surface opposite to the resistor layer; and a convex portion (13), disposed as protruding from the main surface and extending in the main scan direction. The convex portion includes: an inclining surface (132), inclining relative to the main surface and extending in a linear manner when viewing from the main scan direction; and a curving surface (131), disposed, in a protruding direction of the convex portion, on a position farther away from the main surface than the inclining surface, and curving in a manner that protrudes toward the protruding direction. Each of the plurality of heating portions includes a heating curving portion (411) formed on a portion corresponding to the curving surface.