| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a complicated assembling process in a liquid detector which is installed in a liquid housing container. SOLUTION: This liquid detector is installed in this liquid housing container (3) including a flow passage section (32) and a liquid housing section (30) which is connected with the flow passage section. In this case, the flow passage section (32) has first and second external surfaces (38a and 38b) which are arranged to face each other, and a hole (40) which is arranged between the first and second external surfaces. The liquid detector includes a first piezoelectric oscillator (34) which is installed on the first external surface of the flow passage section, and a second piezoelectric oscillator (36) which is installed on the second external surface of the flow passage section, and is arranged to face the first piezoelectric oscillator across the hole. The first piezoelectric oscillator and the second piezoelectric oscillator respectively include lower electrode films (34a and 36a), upper electrode films (34b and 36b) which are arranged to be confronted with the lower electrode films, and piezoelectric body films (34c and 36c) which are pinched in a space between the lower electrode films and the upper electrode films. COPYRIGHT: (C)2009,JPO&INPIT |
