Patent ID: 6989114

Claim:
A micro-shape transcription method for producing an optical waveguide or a diffraction grating from thermoplastic resin, said method comprising: pressing a mold having a transcription face against the thermoplastic resin as a base material heated to a pressing temperature to transcribe a micro pattern to a surface of the base material, the transcription face having a concavo-convex pattern thereon, separating the mold from the base material at a separating temperature, wherein when assuming a temperature for pressing the mold against the base material as T 1 (° C.), a temperature for separating the mold from the base material as T 2 (° C.), thermal expansion coefficients of the mold and the base material as α a and α b , and the maximum distance between a transcription center of the transcription face and the concavo-convex pattern as d (mm), timing of forcibly separating the mold from the base material is determined so that the following relations (1) and (2): T 1 ≧T 2 (1) |α a −α b |·( T 1 −T 2 )· d≦ 4×10 −2 (2) are simultaneously satisfied.