(19)
(11) EP 0 425 940 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.09.1992 Bulletin 1992/36

(43) Date of publication A2:
08.05.1991 Bulletin 1991/19

(21) Application number: 90120114.5

(22) Date of filing: 19.10.1990
(51) International Patent Classification (IPC)5: F42C 13/02
(84) Designated Contracting States:
ES FR GB

(30) Priority: 03.11.1989 IT 6794289

(71) Applicant: FIAT Componenti e Impianti per l'Energia e l'Industria S.p.A.
I-20146 Milano (IT)

(72) Inventor:
  • Russo, Antonio
    I-16143 Genova (IT)

(74) Representative: Jorio, Paolo et al
STUDIO TORTA Società Semplice Via Viotti 9
I-10121 Torino
I-10121 Torino (IT)


(56) References cited: : 
   
       


    (54) A fuse for a rotating projectile, having a device for detecting the presence of a target


    (57) A fuse (16) has a detector device (17) comprising a sensor (48) of infra-red radiation and a single flat-convex lens (19), the refracted rays of the received radiation of which are selectively blocked in such a way as to allow passage towards the sensor only of rays contained in very narrow cones of view (45). For this purpose a plate (37) provided with a series of angularly equidistant apertures (41) is adapted to receive the rays refracted from a zone (27) of the conical lateral surface (23) of the lens. The zone (27) is adjacent the flat surface (22) of the lens and directs the refracted rays to a cylindrical surface (43) which reflects them towards the optical axis (26) of the lens.







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