(19)
(11) EP 0 460 913 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.08.1992 Bulletin 1992/35

(43) Date of publication A2:
11.12.1991 Bulletin 1991/50

(21) Application number: 91305037.3

(22) Date of filing: 04.06.1991
(51) International Patent Classification (IPC)5: F21V 9/00, F21V 7/22, F21V 9/04, H01K 1/32
(84) Designated Contracting States:
DE GB

(30) Priority: 04.06.1990 JP 144486/90

(71) Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
Minato-ku, Tokyo-To (JP)

(72) Inventor:
  • Watanabe, Tsutomu
    Yokosuka-shi, Kanagawa-ken (JP)

(74) Representative: Muir, Ian R. et al
HASELTINE LAKE & CO. Hazlitt House 28 Southampton Buildings Chancery Lane
London WC2A 1AT
London WC2A 1AT (GB)


(56) References cited: : 
   
       


    (54) A lighting unit having a lamp and a reflector


    (57) The lighting unit of the present invention is composed of a lamp (11) having a first interference multi-layer filter as the first film (25) and a reflector (31) having a second interference multi-layer filter as the second film (35). The first interference multi-layer filter forms a visible light transparency/ infrared-ray reflecting film and the second interference multi-layer filter forms a infrared-ray transmitting/ visible light reflecting film.
    Both the first interference multi-layer filter and the second interference multi-layer filter are likely to cause the range of wavelength of light transmitting and light reflecting to vary from the specific range. Therefore both the first film (25) and the second film (35) have means for preventing the above described variation (thickness varying according to the position of the films (25) and (35)).






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