Title:
【発明の名称】焦電型赤外線センサ
Document Type and Number:
Japanese Patent JP3346028
Kind Code:
B2
Abstract:
PURPOSE:To improve stability and reliability in driving a small chopper of a pyroelectric infrared sensor using a piezoelectric actuator. CONSTITUTION:Piezoelectric bodies 12a and 12b are bonded to shims 11a and 11b, respectively, and only a fixing part hole 21a at one end of the shin 11a is fixed with a sensor pedestal 14 and an unimorph element fixture 15a, thus a unimorph piezoelectric element is constituted. Since resonance frequency of a unimorph element is lowered so that a chopper drives at the frequency lower than resonance frequency by about 10%, displacement can be enlarged without using the resonance point whose displacement is unstable, so, the sensor is miniaturized, and adjustment of resonance frequency becomes easier, and rigidity in the direction other than the vibration direction is raised due to multiple supporting paints, thus, more stable driving is realized.
Inventors:
Katsumasa Miki
Koji Nomura
Osamu Kawasaki
Katsumi Imada
Koji Nomura
Osamu Kawasaki
Katsumi Imada
Application Number:
JP8831294A
Publication Date:
November 18, 2002
Filing Date:
April 26, 1994
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01J1/02; G01J1/04; (IPC1-7): G01J1/02; G01J1/04; G01J5/02; G01J5/62
Domestic Patent References:
| JP5196506A | ||||
| JP5209913A | ||||
| JP63164722U |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)