Abstract: A phase-shift and tilt adjustable disk player includes a motor plate to which a spindle motor is fixed. An elastic attaching portion is provided for attaching the motor plate to a deck and simultaneously elastically biasing the motor plate toward the deck. Two adjusting screws are screw-threaded to the deck and each adjusting screw has an end portion which contacts a side portion from the bottom surface of the motor plate for lifting and lowering the motor plate from the deck at one side by a rotation thereof. A cam-shaped phase adjusting member is rotatably installed on the deck for moving the motor plate in a tangential direction of a disk. Therefore, a phase-shift and tilt of an optical pickup can be effectively adjusted by controlling the position and tilt of the spindle motor.

Abstract: A lightweight artificial aggregate manufacturing method includes the steps of: mixing aggregate sludge, whose moisture content exceeds 30%, with stone fragments, generated when pulverizing stone, to decrease the moisture content, mixing this mixture and sewage disposal plant sludge, which are dried and micro-pulverized, in a weight ratio of 50 to 50, and making the mixed sludge spheroids with a rotary plate molding device; applying paper sludge, which is dried and micro-pulverized, to the surface of the spheroids in order to prevent condensation of the spheroid during burning and to light the weight of aggregate; burning the spheroid with reducing flame of a temperature between 1000.degree. C. and 1200.degree. C. in a burning furnace, which uses gas or oil as fuel; and cooling the burned spheroid.