Patent ID: 8820867
Filing Date: 2014-09-02
Classification: B41J,H05B

Abstract:
1. A printer including a normal operating mode and a sleep mode, the printer comprising: a light emitting diode; a first voltage source having a first DC voltage; a second voltage source having a second DC voltage that is greater than the first DC voltage; and a control circuit, wherein the control circuit is configured to cause the light emitting diode to emit at a first light intensity when the printer is in sleep mode, and wherein the control circuit is configured to cause the light emitting diode to emit at a second light intensity greater than the first light intensity when the printer is in normal operating mode; wherein the control circuit includes a first transistor connected between cathode of the light emitting diode and ground; a control signal connected to an input of the first transistor; and a second transistor connected between the first voltage source and the second voltage source, wherein an output of the first transistor is connected to an input of the second transistor.