Patent ID: 11788881

Abstract:
A detection sensor according to an aspect of the invention includes a vibratable film constituted by a piezoelectric film, a case accommodating the vibratable film, and a circuit board. The vibratable film is configured to be irradiated with infrared rays and thereby generate first electric signals through a pyroelectric effect, and configured to be vibrated by sound waves and thereby generate second electric signals through a piezoelectric effect. The case includes a transmissive part. The transmissive part is configured to transmit at least infrared rays and disposed on one side in a first direction relative to the vibratable film to face the vibratable film. The first direction is a thickness direction of the vibratable film. The circuit board is fixed to the case and disposed on the other side in the first direction relative to the vibratable film. The circuit board has a sound hole to input therethrough sound waves.