Patent ID: 7096567

Claim:
A lapping method for performing lapping on an object to be lapped which is elongated in one direction, in which a plurality of elements consisting of at least one of electro-magnetic conversion elements and magneto-electric conversion elements are formed in the length direction, or in which a plurality of said elements and additional electrodes whose characteristic vary according to the lapped amount are formed in the length direction, the method comprising: providing first and second bump electrodes for said elements respectively, and providing third bump electrodes for said additional electrodes, in the providing processes which the second and third bump electrodes are formed on a portion to be disappeared when the object to be lapped is cut and separated; connecting at least one of the second and third bump electrodes electrically to wirings formed on a flexible sheet; measuring a signal regarding the lapping amount obtained from at least one of the second and third bump electrodes through the wirings, and calculating the lapping amount based on the measurement result; and lapping the object to be lapped in accordance with the lapping amount calculated.