Abstract: In order to reduce local deflection mainly caused by static electricity generated on a flexible disk which is capable of optical recording and reproducing and is mounted on an attitude control plate, and to perform stable focusing in the optical recording and reproducing, according to the present invention, a spacer is incorporated into the attitude control plate having a penetrating vents for air inflow, the flexible disk capable of the optical recording and reproducing is mounted to rotate integrally to generate a stable air flow in a gap secured between the flexible disk and the attitude control plate so as to equilibrate a force due to the air flow and gravity and a centrifugal force of the flexible disk, and electrostatic repulsion, so that a stably balanced state of the flexible disk is maintained.

Abstract: An earset communication device capable of reliably suppressing transmission of microvibration to a microphone part. The earset communication device of the present invention is an earset communication device 1 attached to a human ear, which has a main body 2, a sound guide part 3 where a sound guide housing 3a protruding from the main body 2 is attached to the cavum conchae 61, and a microphone part 4 where a microphone housing 4a protruding from the main body 2 in continuously to the sound guide housing 3a in a fork shape is inserted into the cavum conchae in contact therewith. The main body 2 has a speaker 11. The sound guide part 3 has a sound guide tube 12 for guiding the sound output from the speaker 11 to the cavum conchae 61 in the sound guide housing 3a. The microphone part 4 has a bone conduction microphone 30 in the microphone housing 4a.