(19)

(11)

EP 0 236 495 A1

(12)

(43) Date of publication: 16.09.1987 Bulletin 1987/38 (21) Application number: 86906515.0 (22) Date of filing: 08.09.1986

(51) International Patent Classification (IPC):  G02B 5/ 04( . ) H01L 31/ 052( . ) H01L 31/ 042( . ) (86) International application number: PCT/US1986/001841 (87) International publication number: WO 1987/001512 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 09.09.1985 US 19850773697 (71) Applicant: Hughes Aircraft Company Los Angeles California 90045-0066 (US)	(72) Inventor: ELLION, M., Edmund Arcadia, CA 91006 (US)