Reduced size radio selective call receiver with a tactile alert capability by sub-audible sound

摘要

A radio selective call receiver that alerts a user to reception of a call signal by mechanical vibration achieves miniaturization and reduction in thickness by using a sounding body as a reception informing means. The sounding body is selected among reception informing means by a switch. The sounding body generates a non-audio frequency, thus preventing the mechanical vibration from producing an undesired sound. The bottom of the receiver is adapted to be in close contact with a human body wearing the receiver. When a call signal is received, the sounding body oscillates at the non-audio frequency, the sound wave passes through slits to cause vibration, and the user carrying the receiver is alerted tactilely that a call signal is being received.