EP 0135362 A3 19860625 - OPTICAL SMOKE DETECTORS

Title (en)

OPTICAL SMOKE DETECTORS

Publication

EP 0135362 A3 19860625 (EN)

Application

EP 84305514 A 19840813

Priority

AU 3184384 A 19840810
AU PG082283 A 19830812

Abstract (en)

[origin: EP0135362A2] A flash reflector (60) for maximising the intensity of light passing into an air sampling chamber (70) of a smoke detector which enables a reduction in power requirements for the light source. The reflector (60) includes a concave reflection element (61) to focus light from each infinitesimal cross-sectional element of the arc of ionized gas in a flash tube (62), the light output from the whole length of the tube which is optionally of U-shape being focused into the central region (72) of the sampling chamber.

IPC 1-7

G01N 21/53; G08B 17/10

IPC 8 full level

G08B 17/107 (2006.01)

CPC (source: EP)

G08B 17/107 (2013.01); G08B 17/113 (2013.01)

Citation (search report)

[A] FR 2348502 A1 19771110 - LUDERITZ WILLY [DE]
[A] FR 2334097 A1 19770701 - SVENSKA TRAEFORSKNINGSINST [SE], et al
[A] US 2812686 A 19571112 - DAVID SINCLAIR
[A] DE 2624977 A1 19771208 - RUMPF HANS PROF DR ING
[A] FR 2503329 A1 19821008 - KAISER GMBH CO LEUCHTEN KG LIC [DE]
[A] DE 1797079 A1 19710930 - ELBE KAMERA GMBH

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0135362 A2 19850327; EP 0135362 A3 19860625; EP 0135362 B1 19900411

DOCDB simple family (application)

EP 84305514 A 19840813