A telephonic handset comprises an active noise reduction system. The first and second adhesives have a Young’s modulus after curing smaller than that of the conductive adhesive. Engaging surfaces of the cams provide dwell points during movement of the hinge parts relative to each other. or lower, while a mixed gas of TMA and TMG is supplied in a TMGTMA mixing ratio of 317 or more to 617 or less, so that a buffer layer effective in stress relaxation the can be formed in a preferred manner. As a result, the observer feels no eye fatigue or headache even when observing the images for a long time. The compliant seal includes a plurality of layers having different thermal expansion characteristics in an order of gradual change between the arc envelope and the end member.