An endoscope device obtains tissue information of a desired depth near the tissue surface. The combustion chamber includes two walls of revolution each having an annular groove extending around the longitudinal axis of the chamber and opening out inside the chamber. At the time of zooming operation, the three groups of lenses independently move over an optical axis X. The received audio signals are output via the transmitter. The rotation of the cam plate is converted into the reciprocating movement of the piston. The composite material has a Heat Distortion Performance of at least about 10% relative to the non-polar polymer absent the alumina hydrate particulate.