Patent ID: 6518083
Filing Date: 2003-02-11
Classification: G06K

Abstract:
A method of manufacturing a surface shape recognition sensor, comprising the steps of:forming an interlevel dielectric on a semiconductor substrate; forming a first metal film on the interlevel dielectric; forming a first mask pattern having an opening portion in a predetermined region on the first metal film; forming a first metal pattern on a surface of the first metal film exposed to a bottom portion of the opening portion of the first mask pattern by plating; after the first mask pattern is removed, forming a second mask pattern having an opening portion laid out around the first metal pattern on the first metal film and first metal pattern; forming a second metal pattern thicker than the first metal pattern on the surface of the first metal film exposed to a bottom portion of the opening portion of the second mask pattern by plating; after the second mask pattern is removed, etching and removing the first metal film using the first and second metal patterns as a mask to form a lower electrode formed from the first metal film and first metal pattern and a support electrode formed from the first metal film and second metal pattern; forming a sacrificial film on the interlevel dielectric to cover the lower electrode while keeping an upper portion of the support electrode exposed; forming, on the sacrificial film and support electrode, an upper electrode having opening portions in a region other than a region on the lower electrode and a region on the support electrode; after the upper electrode is formed, selectively removing only the sacrificial film through the opening portions; and after the sacrificial film is removed, forming a protective film on the upper electrode, wherein a plurality of capacitive detection elements each having the lower electrode and upper electrode are formed.