Title:
DIFFERENTIALLY SPOTTING TYPE HEAT SENSOR
Document Type and Number:
Japanese Patent JP3820783
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the accuracy in detecting fires from going out of order, depending on whether ambient temperature is high or low.
SOLUTION: This differentially spotting type heat sensor includes a metallic heat sensing casing 1 which is surrounded by a heat sensing plate 10, a diaphragm 11, and a diaphragm supporting plate 12, a body 2 made of a synthetic resin for binding the peripheral edge of the heat-sensing casing 1, a movable electrode moved by the displacement of a diaphragm resulting from the expansion of air in the heat-sensing casing 1 caused by the rise in ambient temperature, and a fixed electrode provided in the body, the movable electrode which moves towards and away from the fixed electrode. A reinforcing rib 22 is provided on the side of the body facing opposite the heat sensing casing.
Inventors:
Shoichi Oka
Takeshi Wada
Takeshi Wada
Application Number:
JP36207698A
Publication Date:
September 13, 2006
Filing Date:
December 21, 1998
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G08B17/04; H01H37/40; G08B17/00; (IPC1-7): H01H37/40; G08B17/00; G08B17/04
Domestic Patent References:
| JP50137990U | ||||
| JP63038241U | ||||
| JP50012689U |
Attorney, Agent or Firm:
Junji Ando