Transducer and electronic device

A transducer comprising:

• a film support portion having a hollow portion;
• a vibration film connected to the film support portion and displaceable in a film thickness direction of the film support portion;
• a piezoelectric element on the vibration film, the piezoelectric element including a pair of electrodes, a piezoelectric film sandwiched between the pair of electrodes, and a plurality of buffer layers on the pair of electrodes;
• and
• in regions overlapping the hollow portion, first regions configured not to include the buffer layers, and second regions configured to include the buffer layers, wherein
• the first regions and the second regions are alternately arranged, and
• one of the first regions is adjacent to a connection portion between the film support portion and the vibration film.

A transducer comprising:

• a film support portion having a hollow portion;
• a vibration film connected to the film support portion and displaceable in a film thickness direction of the film support portion;
• and
• a piezoelectric element on the vibration film, the piezoelectric element including a pair of electrodes and a piezoelectric film sandwiched between the pair of electrodes;
• wherein
• the vibration film includes a plurality of recesses,
• in regions overlapping the hollow portion, the transducer includes first regions configured not to include the recesses, and second regions configured to include the recesses,
• the first regions and the second regions are alternately arranged,
• one of the first regions is adjacent to a connection portion between the film support portion and the vibration film, and
• one of the second regions is parallel to the connection portion.