| 摘要 |
A heating resistor drive circuit includes a first switching transistor, connected in series to the resistor, for connecting and cutting off a current flow supplied from a power source to the heating resistor, and a second switching transistor connected in series to the base of the first transistor. The second transistor is turned on in response to an actuation signal. The drive circuit further includes a suppressing circuit for raising gradually a base current for the first transistor up to a predetermined level while the second transistor is conductive, so as to suppress a current spike flowing through the heating resistor.
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