Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A power supply terminal can have a voltage with a low noise level.

Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage (Vin) in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A power supply terminal can have a voltage with a low noise level.

Abstract: The present invention provides a method of producing a poly-V pulley which can economically produce a poly-V pulley of the type that is to be inserted and coupled onto a shaft via a one-way clutch or a bearing, the number of steps being as small as possible. A trunk is obtained by cutting a thick pipe blank into a fixed dimension. Thereafter, first and second preliminary ears are projectingly formed in the axial ends on the outer peripheral face of the trunk by pressing in which the axial end faces of the trunk are clamped between upper and lower dies respectively having annular wedge-like projections, and the wedge-like projections bite the axial end faces of the trunk. The first and second preliminary ears are shaped into first and second ears by rolling of a predetermined shape, and poly-V grooves are thereby formed.

Abstract: A rear project cabinet for arear projection television set in which the screen and the mirror can be easily set in their positions and an optical accuracy can be established. The screen fixing segment and the mirror fixing segment constituting the rear projector cabinet are formed by plastic material in such a manner that each of its depth size and the inclination angle of the mirror may become a set value, thereby a well-focused appropriate screen can be attained by a mere coupling and assembling of these segments, and even in the case that the screen size at the screen fixing segment is different, it can be accommodated by applying a proper insert die during molding of the mirror fixing segment.