Epson EPL-6200 Description of Mechanisms, Print Head PH, Entire Constitution, Exposure Process

EPSON EPL-6200/EPL-6200L Revision A

2.2 Description of Mechanisms

Semi-conductor Laser

SOS (Start of Scan) Sensor

2.2.1 Print Head (PH)

2.2.1.1 Entire Constitution

Scanning with the laser beam coming out of the Print Head is performed by the polygon motor. (See “Figure 2-7”)

2.2.1.2 Exposure Process

G1 Lens

G2 Lens

1st Mirror

† The laser beam from the print head creates an electrostatic latent image on the OPC
drum surface. (See “Figure 2-8”)		2nd Mirror
† The following control is performed in order to find the appropriate timing to print
the image.	Polygon Mirror	SOS Mirror
„ When the printer receives the PRINT signal, the polygon motor and the main
	Figure 2-7. Print Head Constitution
motor operate, and paper feeding is started.
„ Upon passage of a specified period of time after the front end of the fed sheet		Laser Diode
turns the paper feed sensor ON (TOD signal), the main control board sends
the VIDEO signal to the print head, and printing starts.	Print Head Unit
„ When moving on from the first line to the second line, the print starting
position is shifted down by delaying the VIDEO signal sending time
„ The Print Head incorporates the SOS sensor to unify the timing of the laser	Polygon Motor
emission for every line of main scanning.
	OPC Drum
		SOS (Start of Scan)
		Sensor

Figure 2-8. Exposure Process

Operating Principles Description of Mechanisms 74