Sound generating apparatus, a sound detection apparatus, an acoustic sensor, and an acoustic living body measuring apparatus

A sound generating apparatus comprising:

• a flexible substrate;
• a plurality of bimorph cells arranged along a direction on a surface of said flexible substrate at a predetermined interval, each of said bimorph cells having input/output terminals;
• and
• a buffering material covering surfaces of said flexible substrate with said bimorph cells exposed.

A sound generating apparatus comprising:

• a flexible substrate;
• a plurality of bimorph cells arranged along a direction on a surface of said flexible substrate at a predetermined interval, each of said bimorph cells having input/output terminals;
• and
• a cover including a rim connected to said flexible substrate for covering said bimorph cells with a space.

A sound generating apparatus comprising:

• a plurality of flexible substrates, each having a rectangular shape, arranged in a direction at a predetermined interval;
• first and second bars along said direction, said first bar connecting one side of tips of said flexible substrates, said second bar connecting the other side of tips of said flexible substrates;
• and
• a plurality of bimorph cells arranged on said flexible substrates respectively, each of said bimorph cells having input/output terminals.

A sound generating apparatus comprising:

• a flexible substrate having a comb shape;
• a plurality of bimorph cells arranged on teeth of said flexible substrates respectively, each of said bimorph cells having input/output terminals;
• and
• a flexible bar substrate connecting tips of said teeth each other.

An acoustic sensor comprising:

• first and second portions arranged in a first direction, each including:
• a flexible substrate;
• and
• a plurality of bimorph cells arranged on a surface of said flexible substrate in a second direction perpendicular to said first direction, each of said bimorph cells having input/output terminals;
• and
• connecting substrate extending in said first direction for connecting said first substrate to said second substrate to maintain a distance between said first and second portions.

An acoustic sensor comprising:

• sound generation and sound detection portions arranged in a first direction, said sound generation portion including:
• a flexible substrate;
• and
• a plurality of bimorph cells arranged on a surface of said flexible substrate in a second direction perpendicular to said first direction, each of said bimorph cells having input/output terminals, said sound detection portion including:
• a flexible piezoelectric plastic substrate including an island portion and a bar portion extending from said island portion in said second direction, a tip of said bar portion opposite to said island portion being connected to said flexible substrate;
• and
• electrodes on said island portion for detecting the sound from said sound generation portion via a living body and outputting a sound detection signal, a distance between said sound generation portion and said sound detection portion maintained by said bar portion.