Scanning apparatus having a fluorescent lamp and control...

Details Scanning apparatus having a fluorescent lamp and control... Scanning apparatus having a fluorescent lamp and control...

2007-10-02

2007-10-02

Vo, Tuyet (Department: 2821)

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

C347S128000, C347S130000, C347S129000, C315S247000, C315S224000

Reexamination Certificate

active

10860575

ABSTRACT:
A scanning apparatus having a cold cathode fluorescent lamp includes a central processing unit (CPU) controlling a scan unit to be in one of the stand-by mode, a scan mode and a sleep mode and outputting a PWM signal having a variable duty ratio based on an operation mode of the scan unit; a filter unit receiving the PWM signal from the CPU, filtering the PWM signal, and outputting the filtered signal; a feedback unit detecting the voltage applied to the fluorescent lamp and outputting a feedback signal; a controlling unit controlling the illumination of the fluorescent lamp based on the voltage input from the feedback unit, the controlling unit outputting a control signal variably controlling the voltage applied to the fluorescent lamp depending on the filtered signal; and a lamp drive unit applying variable AC voltage to the fluorescent lamp based on the control signal, thereby driving the fluorescent lamp. Accordingly, it is possible to control the luminous-intensity of the fluorescent lamp, reduce preheating time of the fluorescent lamp, extending the fluorescent lamp's lifetime, and lowering the power consumption.

REFERENCES:
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patent: 5270823 (1993-12-01), Heidebroek et al.
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patent: 6414447 (2002-07-01), Kitamura et al.
patent: 6546132 (2003-04-01), Bhattacharjya et al.
patent: 2002/0017897 (2002-02-01), Wilcox et al.
patent: 2002/0121882 (2002-09-01), Matsuo et al.

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