Abstract: In a first light emission control device, a clock signal is generated, and after a first driving sequence starts to be performed in which the respective states of light-emitting elements in a first light-emitting element array are sequentially switched synchronously with the clock signal, at a particular time point a characteristic of the clock signal is changed from a first characteristic to a second characteristic. After the change, in a second light emission control device, a second driving sequence is performed in which the respective states of light-emitting elements in a second light-emitting element array are sequentially switched synchronously with the clock signal.

Abstract: A substrate for a power module comprises a substrate main body having a plate-shape, a first surface, which is one surface of the substrate main body and a mounting surface that a semiconductor device is mounted on, and a second surface, which is the other surface of the substrate main body and an insulation layer is formed on, wherein the substrate main body is made of a metal matrix composite plate composed of a metal matrix composite in which metal is filled into a carbonaceous material.

Abstract: A method for reclaiming a pigment-attached red-emitting phosphor recovered from a manufacturing process for a color picture tube, which comprises treating the phosphor with an aqueous solution containing NaOH, NaClO and H.sub.2 O.sub.2 and then treating it with a weak acid, whereby the pigment can be prevented from exfoliation by suppressing the dissolution of the binder which attaches the pigment to the phosphor, and blue- and green-emitting phosphors contained as contaminants in the recovered red-emitting phosphor can be completely removed. The method provides a reclaimed red-emitted phosphor with high luminance and a good coating property.