A battery-powered printer includes a printing head that has a plurality of heat generating elements arranged along a direction orthogonal to a transport direction of a recording medium and is configured to print on the recording medium, a temperature sensor configured to measure a temperature within the printer, and a processor configured to determine whether the temperature measured by the temperature sensor is equal to or lower than a predetermined threshold, determine a constant printing speed at the time of printing under a condition where the temperature is equal to or lower than the predetermined threshold, and control the printing head and a transporting speed of the recording medium so as to cause each line of the print data to be printed on the recording medium at the constant printing speed.

A thermal printer includes: a plurality of heat elements that are to be heated by applying an electrical power; a printing controller that applies a first electrical power to heat elements not to be used for printing, the first electrical power depending on the number of heat elements not to be used for printing among the plurality of heat elements; and a thermal head that prints using the plurality of heat elements.

A printer includes a controller configured to, based on print data, perform acquiring a condition value, calculating, for each type of dots, an additional period of time a.sub.n=(T.sub.n+X.sub.n)(T.sub.n-1X.sub.n-1), where T.sub.n represents a specified period of time for applying energy to a heating element to form an n-th type of dot, X.sub.n represents a correction period of time that is added to the specified period of time T.sub.n to correct a dot formation condition of the n-th type of dot in accordance with the condition value, a heating period of time A.sub.n for forming the n-th type of dot is obtained by adding the correction period of time X.sub.n to the specified period of time T.sub.n, and is derived from adding the additional period of time a.sub.n to a heating period of time A.sub.n-1, and setting the heating period of time A.sub.n=.sub.k=1.sup.na.sub.k, for each dot included in a target line.

A printing device includes a thermal head and a head controller. The head controller acquires a number of heater elements to energize based on the line print data, and determines an energization time of one or more heater elements corresponding to the line print data according to a result of comparison between the number of heater elements to energize and a first threshold, wherein in a case where a width of an ink ribbon heated by the energization is equal to or wider than a second threshold, the first threshold being set to be a value that is greater than a value that is set for the first threshold when the width of the ink ribbon heated by the energization is narrower than the second threshold.

To appropriately color develop ink according to a print condition even when carrying out the printing step and the color developing step in a series of steps. A printing device includes a printing machine that discharges an ink to a print medium and a color developing machine that heats the print medium, on which the ink discharged by the printing machine is attached, to color develop the ink. The printing device includes a controller that adjusts at least one of a heating time and a heating temperature of the print medium by the color developing machine according to at least one of a transporting speed of the print medium transported from the printing machine and an amount of the ink which is discharged.

An inkjet printing system includes at least one drop ejector array module having an array of drop ejectors disposed on a substrate. A primary temperature sensor is located near a first set of drop ejectors. At least one secondary temperature sensor is located near a second set of drop ejectors. Temperature comparison circuitry on the substrate is configured to compare signals from the primary temperature sensor and the at least one secondary temperature sensor. Pulse modification circuitry on the substrate is electrically connected to the temperature comparison circuitry and is configured to modify an input pulse waveform. The inkjet printing system also includes a controller that is electrically connected to the primary temperature sensor via a temperature output pad and to the pulse modification circuitry via a pulse waveform input pad.

An inkjet printing system includes at least one drop ejector array module having an array of drop ejectors disposed on a substrate. A primary temperature sensor is located near a first set of drop ejectors. At least one secondary temperature sensor is located near a second set of drop ejectors. Temperature comparison circuitry on the substrate is configured to compare signals from the primary temperature sensor and the at least one secondary temperature sensor. Pulse modification circuitry on the substrate is electrically connected to the temperature comparison circuitry and is configured to modify an input pulse waveform. The inkjet printing system also includes a controller that is electrically connected to the primary temperature sensor via a temperature output pad and to the pulse modification circuitry via a pulse waveform input pad.

A thermal printer that forms an image on a medium by a thermal head having a heat generating element includes a temperature sensor configured to measure a temperature of the thermal head; a head lifting motor configured to switch the thermal head between a head down state in which the thermal head can form an image on the medium and a head up state in which the thermal head is separated from the medium; and an MPU configured to determine whether a measurement temperature measured by the temperature sensor is less than a predetermined temperature threshold and cause the heat generating element to generate heat by switching the thermal head to a head up state by the head lifting motor, if the measurement temperature is less than the temperature threshold.

A thermal printer that forms an image on a medium by a thermal head having a heat generating element includes a temperature sensor configured to measure a temperature of the thermal head; a head lifting motor configured to switch the thermal head between a head down state in which the thermal head can form an image on the medium and a head up state in which the thermal head is separated from the medium; and an MPU configured to determine whether a measurement temperature measured by the temperature sensor is less than a predetermined temperature threshold and cause the heat generating element to generate heat by switching the thermal head to a head up state by the head lifting motor, if the measurement temperature is less than the temperature threshold.

A thermal printer with a thermal head including a heating element forms an image on a medium. The printer includes a temperature sensor that measures a temperature of the medium, a heater that heats an interior of the thermal printer, and a processor. The processor determines whether a temperature measured by the temperature sensor is equal to or greater than a preset temperature threshold, operate the heater if the measured temperature is less than the temperature threshold, and determine an application energy amount for the thermal head based on the measured temperature if the measured temperature is equal to or greater than the temperature threshold.