| 摘要 |
PROBLEM TO BE SOLVED: To correct a high tone area at a low cost by a simple structure, without using a complicated electric circuit by providing a clearance on a partition wall, preparing a movable piece for covering the partition wall, operating the movable piece by a knob and providing the movable piece with a spring property capable of continuously covering the clearance from full closure to full open. SOLUTION: The space of the front surface of a ceramic receiver 15 has the role of a capacitor C1 acoustically, and the sound emitting hole 12 of an earpiece 11 can be handled as an inductance. The capacitor C1 and an inductance LC constitute a resonance circuit and another resonance circuit is similarly constituted by the space capacity of the external ear of a receiver and an inductance. When a clearance 17 is at a fully closed state, the space capacity of the space 16 for resonance is the capacitor and reception characteristics desired by a healthy person are obtained in addition to the single body characteristics of the ceramic receiver 15. However, when the clearance 17 is fully opened, the space capacity capacitor of the space 16 for the resonance indicates a release state.
|
