JPH0463249U

JPH0463249U -

Info

Publication number: JPH0463249U
Application number: JP10611890U
Authority: JP
Priority date: 1990-10-09
Filing date: 1990-10-09
Publication date: 1992-05-29

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す回路図、第２
図は従来の電圧切換回路の一例を示す回路図であ
る。２……電圧出力回路、１１……電圧切換回路、
１２……抵抗、１３，１４……直列回路、１５…
…抵抗値可変回路、１６……印字制御回路、１７
……サーマルヘツド、１８……サーマルヘツド駆
動用トランジスタ、１９……温度検出手段、２０
……断続制御回路。 Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a circuit diagram showing an example of a conventional voltage switching circuit. 2... Voltage output circuit, 11... Voltage switching circuit,
12...Resistor, 13,14...Series circuit, 15...
...Resistance value variable circuit, 16... Printing control circuit, 17
...Thermal head, 18...Thermal head driving transistor, 19...Temperature detection means, 20
...Intermittent control circuit.

Claims

[Claims for Utility Model Registration] 1. A voltage input section, a voltage output section, and an output adjustment section. A voltage output circuit that outputs a voltage, at least one series circuit consisting of one resistor and one transistor, and another resistor are connected in parallel to each other, and both terminals thereof are connected to the output of the voltage output circuit. A voltage switching circuit comprising: a variable resistance circuit connected to an adjustment section. 2. A voltage output circuit comprising a voltage input section, a voltage output section, and an output adjustment section, and outputs a predetermined voltage from the voltage output section based on a resistance value in the output adjustment section when power is supplied to the voltage input section. , a variable resistance circuit formed by connecting at least two series circuits each including one resistor and one transistor in parallel, both terminals of which are connected to the output adjustment section of the voltage output circuit. Features a voltage switching circuit. 3. A voltage output circuit comprising a voltage input section, a voltage output section, and an output adjustment section, and outputs a predetermined voltage from the voltage output section based on a resistance value in the output adjustment section when power is supplied to the voltage input section. , a resistance value formed by connecting at least one series circuit consisting of one resistor and one transistor in parallel with another resistor, both terminals of which are connected to the output adjustment section of the voltage output circuit. a variable circuit, a print control circuit connected to the voltage output section of the voltage output circuit, and a print control circuit that is driven by the output voltage from the voltage output section and whose output is controlled by a print control signal from the print control circuit. A thermal head driving transistor that drives the thermal head with its output current, a temperature detection means that detects the temperature of the thermal head, and an on/off process for the transistor in the variable resistance circuit based on the detection result of the temperature detection means. 1. A voltage switching circuit comprising an intermittent control circuit. 4. A voltage output circuit comprising a voltage input section, a voltage output section, and an output adjustment section, and outputs a predetermined voltage from the voltage output section based on a resistance value in the output adjustment section when power is supplied to the voltage input section. , a variable resistance circuit formed by connecting at least two series circuits each including one resistor and one transistor in parallel, both terminals of which are connected to the output adjustment section of the voltage output circuit; and the voltage output circuit. A print control circuit is connected to the voltage output section of the circuit, and is driven by the output voltage from the voltage output section, and output control is performed by a print control signal from the print control circuit, and the output current drives the thermal head. A thermal head driving transistor to be driven, a temperature detecting means for detecting the temperature of the thermal head, and an on/off control circuit that performs on/off processing of the transistor in the resistance value variable circuit based on the detection result by the temperature detecting means. A voltage switching circuit characterized by: