Title:
FIRE SENSOR
Document Type and Number:
Japanese Patent JP3230118
Kind Code:
B2
Abstract:
PURPOSE: To facilitate the assembling and maintenance while precluding the possibility of occurrence of malfunction due to a noise by an external magnetic field by providing a light receiving part mount base having a projection and a printed circuit board having an amplifier or the like and mounting the printed circuit board to the projection of the light receiving part mount base.
CONSTITUTION: A light receiving part mount base 10 is placed on a main printed circuit board 30 and both thread throughholes are matched and they are fixed. Then a mount base cover 25 is inserted from the upper part of the light receiving section mount base 10 having a projection and a screw is inserted and fixed to the screw hole provided to the light receiving section mount base 10. Thus, the light receiving part mount base 10 is accommodated in the light receiving part of the light receiving glass in the main printed circuit board 30, check lamps 33a, 33b are accommodated in a check lamp globe and fitted to the cover via a support. Then the mount arm of the cover is overlapped on the mount arm of the case via a packing and fixed air-tightly. Since the main printed circuit board 30 is accommodated in the metallic case, the effect of an external magnetic field is not received.
Inventors:
Kentaro Higashi
Application Number:
JP30263593A
Publication Date:
November 19, 2001
Filing Date:
December 02, 1993
Export Citation:
Assignee:
Nomi Disaster Prevention Co., Ltd.
International Classes:
G01J5/00; F23N5/08; G08B17/00; G08B17/12; H05K7/14; H05K9/00; (IPC1-7): G08B17/12; F23N5/08; G08B17/00; H05K7/14; H05K9/00
Domestic Patent References:
| JP517789U | ||||
| JP5844478Y2 |
Attorney, Agent or Firm:
Muneharu Sasaki (3 outside)