(19)

(11)

EP 2 467 869 A2

(12)

(88) Date of publication A3: 30.06.2011 (43) Date of publication: 27.06.2012 Bulletin 2012/26 (21) Application number: 10757809.8 (22) Date of filing: 12.08.2010

(51) International Patent Classification (IPC):  H01J 65/04(2006.01) (86) International application number: PCT/GB2010/001518 (87) International publication number: WO 2011/020989 (24.02.2011 Gazette 2011/08)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 21.08.2009 GB 0914641 04.09.2009 US 240143 P (71) Applicant: Ceravision Limited Bletchley, Milton Keynes MK3 6EB (GB)	(72) Inventor: EELES, David Bruce Milton Keynes MK14 5PS (GB) (74) Representative: Brooks, Nigel Samuel  Hill Hampton East Meon Petersfield Hampshire GU32 1QN Petersfield Hampshire GU32 1QN (GB)