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Patent Searching and Data


Title:
DRIVING CIRCUIT FOR HEAT-SENSITIVE RECORDER
Document Type and Number:
Japanese Patent JPS5763280
Kind Code:
A
Abstract:

PURPOSE: To provide a driving circuit capable of facilitating group energizing voltage setting and maintenance work and adapted to determine the group energizing voltage with a variable resistor by connecting a particular circuit to the control input terminals of group energizing switching elements or group energizing switching circuit.

CONSTITUTION: A group energizing switching circuit for applying a heat generation energizing voltage to terminals S6 and S7 are constituted by the combinations of NPN transistors 9-1W9-3 and NPN transistors 10-1W10-3, respectively. A cascade circuit of a current limiting resistor 12 and a variable resistor 13 is connected to the control input terminal of the group energizing switching circuit. A regulated power supply circuit 11 is connected to the resistor 12 in order to maintain the voltage (current) applied to the resistor 12 at a fixed level. When the group selection signal input terminal S1 is grounded, a sum of a voltage Vb at a point (b) and the voltage drop VD of a diode 6-1 is generated at the base of the transistor 9-1, while the remainder of subtraction of a voltage drop VBP between the base and the emitter of the transistor from the voltage Vb is generated at the emitter of the transistor 10-1. The applied voltage can be regulated with the variable resistor 13.


Inventors:
Katsuragi, Shigeru
Application Number:
JP1980000138280
Publication Date:
April 16, 1982
Filing Date:
October 03, 1980
Export Citation:
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Assignee:
RICOH CO LTD
International Classes:
B41J2/35; G05F1/56; H04N1/40; (IPC1-7): B41J3/20; G05F1/56