Patent ID: 8790936

Claim:
A method for manufacturing an optical deflector, comprising: forming a wafer-level optical deflector assembly on a front surface side of a wafer; etching the front surface side of said wafer by using elements of said wafer-level optical deflector assembly as a first etching mask, to form a front-side dicing street in the front surface side of said wafer; provisionally adhering a transparent substrate with an inside cavity to the front surface side of said wafer, in such a way that the inside cavity of said transparent substrate opposes movable elements of said wafer-level optical deflector assembly; forming a second etching mask on a back surface side of said wafer; etching the back surface side of said wafer by using said second etching mask in such a way that a cavity opposing the movable elements of said wafer-level optical deflector assembly and a back-side dicing street are created in the back surface side of said wafer, said back-side dicing street leading to said front-side dicing street; adhering an adhesive sheet with a ring-shaped rim to the back surface side of said wafer, after the back surface side of said wafer is etched; removing said transparent substrate from the front surface side of said wafer, after said adhesive sheet is adhered to the back surface side of said wafer; and expanding said ring-shaped rim to widen said front-side dicing street and said back-side dicing street to pick up optical deflectors one by one from said wafer, after said transparent substrate is removed.