(19)
(11) EP 0 135 362 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.06.1986 Bulletin 1986/26

(43) Date of publication A2:
27.03.1985 Bulletin 1985/13

(21) Application number: 84305514

(22) Date of filing: 13.08.1984
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 12.08.1983 AU 82283

(71) Applicant: Cole, Martin Terence
 ()

(72) Inventor:
  • Cole, Martin Terence
     ()

   


(54) Optical smoke detectors


(57) 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.






Search report