(19)

(11)

EP 0 913 003 A1

(12)

(43) Date of publication: 06.05.1999 Bulletin 1999/18 (21) Application number: 97933308.0 (22) Date of filing: 03.07.1997

(51) International Patent Classification (IPC):  H01L 31/ 107( . ) (86) International application number: PCT/US1997/011768 (87) International publication number: WO 1998/000873 (08.01.1998 Gazette 1998/01)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 03.07.1996 US 19960035349P (71) Applicant: ADVANCED PHOTONIX, INC. Camarillo, CA 93012 (US)	(72) Inventors: JOSTAD, Leon, Leslie Cayucos, CA 93430 (US) BOISVERT, Joseph, Charles Thousand Oaks, CA 91362 (US) MONTROY, John, Thomas Thousand Oaks, CA 91362 (US) (74) Representative: Eidelsberg, Victor Albert, et al  Cabinet Flechner 22, Avenue de Friedland 75008 Paris 75008 Paris (FR)