公开(公告)号：IT1000987B

公开(公告)日：1976-04-10

申请号：IT971273

申请日：1973-12-06

Applicant: ELECTRO SIGNAL LAB

Inventor： STEELE D ,  BRUNN E

IPC: G01J1/02 ,  G01N21/53 ,  G08B17/10 ,  G08B17/107 ,  A62C

Abstract: An optical smoke detector comprises split optical block mounting an exciter lamp and a smoke sensing photocell in two passages directed toward an intersection zone in a dark chamber formed by one side of the block, a base with a bottom and side wall and a cover, all secured together by one screw. A light pipe from the lamp extends outside the cover to indicate lamp operation. A second photocell is in a third passage communicating with the lamp passage, the third passage mounting diffuser and pin hole apertured disks for spreading a controlled light intensity over the second photocell. The optical block assembly includes an alarm circuit board operatively connected to the photocells and physically positioning the block on the base.