Patent ID: 7635191

Claim:
A manufacturing method for variable shape mirrors, each of the variable shape mirrors comprising: a support substrate; a mirror substrate that is opposed to the support substrate and is supported by support pillars and has a reflection film on the surface; and piezoelectric elements that are sandwiched between the support substrate and the mirror substrate and are expanded or contracted when an electric field is applied so that they deform the mirror substrate and the reflection film, and the manufacturing method comprising: a first wafer groove forming step for forming first grooves along boundaries between areas to be the variable shape mirrors on a surface of a first wafer to be the support substrate; a second wafer groove forming step for forming second grooves along boundaries between the areas on a surface of a second wafer to be the mirror substrate; a bonding step for arranging the first wafer and the second wafer so that the support pillars and the piezoelectric elements are sandwiched between the first wafer and the second wafer at the areas with the surface on which the second grooves are formed facing inward, so as to bond at least the first wafer and the support pillars to each other, the first wafer and the piezoelectric elements to each other, and the second wafer and the support pillars to each other; a second wafer dividing step for dividing the second wafer into the mirror substrates by flattening process of the outer surface of the second wafer until at least reaching the second groove; a first wafer dividing step for dividing the first wafer into the support substrates by breaking the first wafer along the first grooves; and a reflection film forming step for forming the reflection film on the outer surface of each of the mirror substrates obtained by the dividing step.