PURPOSE: To enhance printing quality, by providing a GND pattern being an earthing conductor on an insulating substrate and providing a large number of lead-out parts each connected to said GND pattern at one terminal thereof and connected to an external connection wire at the other terminal thereof to an LED array part at a predetermined interval.
CONSTITUTION: A GND pattern (earthing conductor) 2 is formed on a ceramic substrate and earth terminal parts 3, 3 are formed to both ends thereof. Earth lead-out pattern parts 5 of the GND pattern 2 are provided to the array part of an LED printer head and connected to FPC pressure contact terminal parts 6 on an earth side through ground line lead-out part 7. Power supply lines 4, 4 are respectively connected to the FPC pressure contact terminals 9 on the power supply side through power supply line lead-out parts 10. Therefore, the current flowing to the line 2 flows to a large number of the earth lead-out patterns 5, lead-out parts 7 and pressure contact terminals 6 in a split from. As a result, the line drop of the GND pattern 2 is reduced and uniformized to reduce the variation in the quantity of light of LED and printing quality or image quality is enhanced.
HIRAO HIDENORI
SANYO ELECTRIC CO
TOKYO SANYO ELECTRIC CO