(19)
(11) EP 0 405 735 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.10.1991 Bulletin 1991/43

(43) Date of publication A2:
02.01.1991 Bulletin 1991/01

(21) Application number: 90305291.8

(22) Date of filing: 16.05.1990
(51) International Patent Classification (IPC)5: H01H 13/70
(84) Designated Contracting States:
DE FR GB

(30) Priority: 29.06.1989 GB 8914889

(71) Applicant: NOKIA MOBILE PHONES (U.K.) LIMITED
Camberley, Surrey GU15 3SP (GB)

(72) Inventors:
  • Harrup, Anthony Barry
    Weybridge, Surrey KT14 7EN (GB)
  • Johnson, Martin Leslie
    Camberley, Surrey GU17 7SN (GB)

(74) Representative: Frain, Timothy John 
Patent Department Nokia Mobile Phones St Georges Court St Georges Road
Camberley, Surrey GU15 3QZ
Camberley, Surrey GU15 3QZ (GB)


(56) References cited: : 
   
       


    (54) Keypad assembly


    (57) A keypad assembly comprises an elastomeric membrane (4) with integral keys (3) which extend through apertures (2) in a housing (1). In the non-actuated (OFF) position the keys are substantially flush or slightly proud of the top surface (1a) of the housing, but when the keys are depressed they descend beneath the top surface (1a). The apertures (2) or the keys (3) (or both) have chamfered walls, the angle of chamfer being at least 4° and preferably 7°-10°. This prevents the keys from jarring or sticking against the walls of the apertures, enabling them to return to the non-actuated position without difficulty.







    Search report