Printer

A printer comprising:

• a thermal head that includes a line head in which heating elements are arranged in a straight line;
• a feed device that is configured to feed a printing medium in a vertical scanning direction orthogonal to a main scanning direction, the main scanning direction being a direction in which the heating elements are arranged in the straight line in the line head;
• and
• a control device that is configured to control the feed device and the thermal head, the printer performing printing by forming a print dot by heating on the printing medium that is fed by the feed device in the vertical scanning direction of the thermal head, the printing medium being heated, in each iteration of a pulse application cycle that is sequentially repeated, by the control device's performing of pulse applying processing for selectively heating the heating elements that are arranged in the line head of the thermal head,
• wherein
• each iteration of the pulse application cycle is a time period from a main heating starting time to a next main heating starting time, the main heating starting time being a time at which applying of main pulses is started in the line head of the thermal head, in order to form on the printing medium a series of print dots in the vertical scanning direction of the thermal head, the main pulses being configured to implement main heating for forming the print dot on the printing medium, and
• the control device is configured to perform printing by using a first mode, in a case where the main heating by the main pulses is not performed on a second heating element that is adjacent in a main scanning direction to a first heating element, for which the main heating is performed by the main pulses, the first mode being a mode in which applying of the main pulses to the first heating element and applying of a first sub-pulse to the second heating element are both started at the same time starting from the main heating starting time, the first sub-pulse being configured to implement auxiliary heating that cannot form the print dot on the printing medium just by the applying of the first sub-pulse and that supplements the main heating of the first heating element by the main pulses.