Abstract: An optical disk writing device includes an optical disk drive recording data into an optical disk and having no harddisk as a data buffer, and a host; computer controlling the optical disk drive and transferring the data to the optical disk drive by using a data storage connected to the host computer as a data buffer for the transferring and the recording.

Abstract: An optical disk writing device includes an optical disk drive recording data into an optical disk and having no harddisk as a data buffer, and a host computer controlling the optical disk drive and transferring the data to the optical disk drive by using a data storage connected to the host computer as a data buffer for the transferring and the recording.

Abstract: The present invention, which is directed to a light-emitting diode array for use as the light source in optical printers and other such applications, provides improved optical efficiency and a more uniform distribution of emission intensity. The light-emitting diodes are formed as reverse mesas with a mirrored sloping surface that reflects light in the direction of the light emitting surface of the diode. This improves the emission efficiency of each diode. In addition, this also increases the light output from the edge portions of light-emitting surfaces of the diodes so as to produce a more uniform distribution of light output from the light-emitting diodes.

Abstract: A light-emitting diode array having improved optical output efficiency and uniformity without loss of reliability or reproducibility is described. The array is formed of an n-type conductivity GaAs buffer layer on an n-type conductivity GaAs substrate, followed by 25-pair n-type conductivity Al.sub.y Ga.sub.1-y As/AlAs semiconductor multilayer mirror, a p-type conductivity Al.sub.x Ga.sub.1-x As active layer, and a p++ type conductivity GaAs contact layer. The surface of the emission region is a total reflection prevention surface with a sawtooth-shaped projection configuration. This provides a large decrease in total reflection loss of light from the emission layer, and also enables light propagating in the opposite direction to the output surface to be efficiently outputed.

Abstract: A light-emitting diode array in which the light-emitting surface for external output of light from the light-emitting layer is processed to give it a slope, for example, which by increasing the critical angle of the internal reflection between the active layer and the air raises the external light output efficiency.