To detect, in a non-contact manner, an obstacle existing at closer position compared with the case by a conventional ultrasonic sensor using a piezoelectric element.
An obstacle detection sensor D for vehicle comprises: a transmitting device 1 including a transmitting element 10 capable of transmitting sound waves, and a driving circuit 20 for driving the transmitting element 10; a receiving apparatus 3 including a receiving element 30 for receiving sound waves transmitted from the transmitting element 10 and reflected on the obstacle Ob, and for converting received sound waves to an electric reception signal; and a signal processing circuit 4 including an arithmetic operation unit for estimating a distance up to the obstacle Ob, and an azimuth where the obstacle Ob is existing on the basis of the time till the sound waves are received by the receiving element 30, since the sound waves are transmitted from the transmitting element 10. The transmitting element 10 is a sound wave generating element for generating sound waves by applying thermal shock to air.
| JPS58107699 | [Title of the device] Electrostatic model electroacoustic transduction device |
| JP6057571 | Electric capacity type transducer |
| WO/2016/120213 | MEMS DEVICES AND PROCESSES |
HONDA YOSHIAKI
WATABE YOSHIFUMI
| JPH04166579A | 1992-06-12 | |||
| JP2004180262A | 2004-06-24 |
Atsuo Mori