Circuits and methods are disclosed for suppressing arcing occurring in switch contacts that includes a triggerable electronic switch in parallel with a series connection of relay switches. A reticle-masking blade is supported with a reticle-masking blade carriage assembly. The intended population to benefit from this device are those who have experienced stroke or compromise to areas of the visual system responsible for conscious sight. An average of surface areas of lower surfaces of each of the second plurality of leads is at least twice as large as an average of surface areas of lower surfaces of each of the first plurality of leads. The second keyhole aperture has a second slot and a second passage contiguous with the second slot. The disk device is provided with: a pick arm 130 which swings and inserts a drive unit for playing a disk D into a space created by splitting a plurality of trays 250; and a loading arm 256 which can move between a leading position for abutting on the disk D insertedejected with respect to the tray 250 and leading the disk D, and a withdrawing position for withdrawing from the disk to be played.