An apparatus includes a seat back having an outer surface that selectively contacts a seat occupant and a head restraint extending from the seat back that has a head restraint portion that selectively contacts the seat occupant. In a liquid crystal light valve of the invention, an image signal for which the polarity is inverted for each one horizontal period, is supplied to each data line, and for each horizontal period plural pulse signals which each rise at a different timing, are supplied to each of plural scanning lines while skipping one part of the scanning lines. The lens is configured by bonding the ends of two gradient index rod lenses having different refractive index distribution constants and the substantially same outer diameter to each other to align their optical axes to each other. The bracket can include a pair of side supports secured to opposing sides of the axle, with each of the side brackets having a length greater than the radius of the caster wheel. A safety cap is mounted on the external surface of the cup port and partially closes the external open end thereof. The invention includes MMIC and high Tc superconducting transmit systems.