Bone Conduction Transducer

Ears-free, thus providing extended use comfort and safety No electromagnetic waves (EMW)

Bone Conduction Transducer

A. General Description

Most of what we hear is due to sound waves traveling through the air. Sound waves travelthrough the outer and middle ear before arriving at the cochlea in the inner ear. Sound waves canalso get to the cochlea through direct vibration of the bones in the head.Bone conductionis the conduction of sound to the inner ear through the bones of the skull.Bone conduction products have following advantages over traditional headphones:

1Ears-free, thus providing extended use comfort and safety

2No electromagnetic waves (EMW), eliminating the potential effect of EMW on cerebrum (ifany)

3High sound clarity in very noisy environments, can be used with hearing protection

4Can have the perception of stereo soundBone conduction Transducers (BCT) is an electro-mechanical device, which directly convertthe electric signal to mechanical vibration. BCT can be used for sound generator for mobile devicesuch as MP3, headphone, Bluetooth, mobile phone and table vibration speakers.The BCT transducer is the new world standard in mobile device for sound generation. . Itdelivers accurate broadband sound output to the users. . Prepare to discover a new dimension ofsound. The BCT transducer creates sound through vibration transfer instead of pressuring the airaround you. The audio signal is delivered so cleanly that the brain interprets the stimulus asSound.

B. Physical Dimension

Figure 1. Bone conduction transducer for mobile device,

Figure 2. Physical layout of the transducer and physical dimension in (mm)

Figure 3. Schematic diagram of the space requirement for installing a bone conduction transduceron the mobile device. Physical dimension in (mm).

For installing BCT in the mobile device, such as cellular phone, the space with 22.5 mm oflength, 14.5mm of width and 9 mm of height in the mobile phone is required, as shown in Figure 3.The distance between two 1.5 mm screws is 6 mm. It is necessary to insert a foam or a rub sheetbetween transducer and shell of mobile device for eliminating shell vibration.

C. CharacteristicFigure 4 Frequency response spectrum of the transducer 

Bone Conduction Transducer