A puncture instrument includes a movable body movably disposed in a case, and a needle unit held by the movable body and having a needle. As a result, recording and reproduction of data is optimized by compressing an image signal based on whether or not there exists a significant difference between two adjacent frames or units of image data. The invention is additionally designed to allow the substitution of lampslight bulbs without requiring re-aiming of the fixture and to be used without modification with ceiling materials of varying thickness. An antenna system is also formed from an RF antenna and a device to which the RF antenna couples and for which the RF antenna is used.