Title:
【発明の名称】サーマルプリンタ
Document Type and Number:
Japanese Patent JP3068549
Kind Code:
B2
Abstract:
A thermal printer has a thermal head in which a FET is connected in series to an individual heater element of each of heater element groups which are connected in parallel with each other, and to which one capacitor for smoothing a power and eliminating a noise is connected in parallel relative to the heater element group. The thermal head performs printing on a thermal paper. The thermal printer includes a printing power source circuit, a failure detection power source circuit, a failure detection circuit for detecting a presence and absence of the failure of the heater element by comparing a voltage generated at opposite ends of the detecting resistor with a threshold value. FET control means is provided for causing discharging of the capacitor by simultaneously turning on all of the FET under the condition where the printing power source circuit and the failure detection power supply circuit are turned off, before the voltage is supplied from the failure detection power source circuit to the thermal head and the failure detection is performed.
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Inventors:
Kawamori Masami
Application Number:
JP6926398A
Publication Date:
July 24, 2000
Filing Date:
March 05, 1998
Export Citation:
Assignee:
NEC Data Equipment Co., Ltd.
International Classes:
B41J2/355; B41J2/35; (IPC1-7): B41J2/35
Domestic Patent References:
| JP7329334A | ||||
| JP8310030A | ||||
| JP1138744U |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)