A fuel injector for fuel-injection systems of internal combustion engines includes an actuator, a valve needle, which is able to be activated by the actuator to actuate a valve-closure member, which, together with a valve-seat surface formed at a valve-seat member, forms a sealing seat; and a plurality of spray-discharge orifices which is formed in the valve-seat member. A semiconductor laser includes three laser elements having emitting wavelengths of \u03bb1, \u03bb2, and \u03bb3, respectively. In addition, the structure of PDPs is modified to raise firing voltages between these electrodes, preventing erasure of the data written in the address periods. The front surface is covered by the encapsulation and faces the light emitting surface of the encapsulation. The special decimal code for Asian languages provides a means for alphabetizing all characters of the Asian languages.