B4-paper-size 240 dots/IN LED print head, having the following features, and high yield into consideration. A number of LED module each carrying an LED chip on a small ceramic substrate, are aligned on a base plate. To expand the allowance of output power variation of LED array and to obtain high quality print, we controlled the driving current for each LEDs. The LED have the characteristic of high responsibilty and possibility to be driven by a high current, we simplified the circuit by applying the 128×18 chips matrix driving. As the result of head life test, it is satisfactory for the all LED go-on mode for 3000 hr.
抄録全体を表示