Abstract: A retraction mechanism includes a striker provided in either a fixed body or a movable body which is movably supported by the fixed body; a catcher provided in the other body and engaging the striker at a predetermined moved position of the movable body to be capable of engaging and disengaging; and an urging device enabling to accumulate urging forces in a moving process of the movable body. The retraction mechanism retracts the movable body by the urging forces accumulated in the urging device in a state wherein the striker and the catcher are engaged. The retraction mechanism includes a guide device controlling a relative position between the striker and the catcher, and when the striker and the catcher change the relative position, the change thereof is absorbed by the guide device, so that the engagement becomes possible.

Abstract: A reflector for light source of a projector, comprises a cup-shaped part that is formed by forging or casting from aluminum metal or alloy or the like metal, inner face of the cup-shaped part being mirror finished by ultra-precise cutting technique or by grinding with buff or diamond powder as not to have grooves or distortion; and a barrel portion disposed at center of the cup-shaped part and configured to receive an electric-discharge lamp. Omitted thereby is a coating of silicone-based resin that is a must for a reflector formed by metal spinning technique as to cover up the grooves and distortion. Thus, good heat conductivity of the aluminum metal or the like is not hampered, as to achieve a reflector for high-luminance lamp with high power consumption.

Abstract: A flyback transformer wherein the tertiary coil is wound on an auxiliary bobbin provided separately, insertedly on the low tension coil bobbin for the primary coil, thereby to render to insulate completely the tertiary coil from the primary coil.

Abstract: A high-voltage variable resistor including a substrate, a sliding member provided so as to be rotated in sliding contact with the substrate, a casing for accommodating the substrate and sliding member in it, a plurality of connecting terminals connected to the substrate and sliding member, and a rotational rod coupled with the sliding member. The resistor further includes a plurality of springs for electrically connecting, respectively, the connecting terminals to the substrate so that the connecting terminals may be disposed in parallel with opposite surfaces of the substrate.