<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          APR-30-1997
<PERIOD-START>                             MAY-01-1996
<PERIOD-END>                               JUL-31-1996
<CASH>                                          16,109
<SECURITIES>                                    21,196
<RECEIVABLES>                                   12,612
<ALLOWANCES>                                       340
<INVENTORY>                                      9,819
<CURRENT-ASSETS>                                61,635
<PP&E>                                          28,834
<DEPRECIATION>                                  14,302
<TOTAL-ASSETS>                                  79,758
<CURRENT-LIABILITIES>                            9,116
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            11
<OTHER-SE>                                      68,786
<TOTAL-LIABILITY-AND-EQUITY>                    79,758
<SALES>                                         17,252
<TOTAL-REVENUES>                                17,252
<CGS>                                            8,898
<TOTAL-COSTS>                                    8,898
<OTHER-EXPENSES>                                 2,558<F1>
<LOSS-PROVISION>                                    15
<INTEREST-EXPENSE>                                   2
<INCOME-PRETAX>                                  2,654
<INCOME-TAX>                                       867
<INCOME-CONTINUING>                              1,787
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,787
<EPS-PRIMARY>                                      .14
<EPS-DILUTED>                                      .14
<FN>
<F1>RESEARCH AND DEVELOPMENT EXPENSES
</FN>