1 EXHIBIT 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statment of Silicon Valley Group, Inc. on Form S-8 of our reports dated October 22, 1994, appearing in and incorporated by reference in the Annual Report on Form 10-K of Silicon Valley Group, Inc. for the year ended September 30, 1994. /s/ Delotte & Touche LLP DELOITTE & TOUCHE LLP San Jose, California March 15, 1995