Adjustable microphone apparatus

A microphone apparatus, which guides a wave form to a perceptible portion of a microphone from a sound absorbing hole formed on a panel through a sound guide channel, comprising an adjusting mechanism, said adjusting mechanism having:

• a sound box interposed, as a disk space, between two inner wall surfaces parallel to said panel in said sound wave channel, said sound box having holes, which are guided from said sound absorbing hole and said sound perceptible portion, formed at non-opposite positions with respect to each wall surface, and said sound box including a rim portion and a central plate portion wherein said rim portion has a plane shape formed by partially cutting a disk, a side portion and an outer peripheral surface being in slidably contact with each inner wall surface and inner peripheral surface and said central plate portion is formed at the inner side thereof,
• a rotation piece serving as an inner gear element with tooth formed on the inner peripheral side surface of said rim portion;
• a small gear, placed between the central plate portion of said rotation piece and the inner wall surface of said panel side, for meshing with an inner gear of said rim portion;
• and
• a round axial rod installed about said small gear in a standing manner to be passed through a round hole formed on said panel.