Patent ID: 9741564
Date: 2017-08-22
CPC Classifications: G03F,H01L

Claim:
1. A method of forming a mark pattern comprising: coating a film to be processed on a substrate with a photosensitive film; irradiating the photosensitive film with exposure light via a mask, the mask including a first mask pattern region and a second mask pattern region, the first mask pattern region being a region in which a first circuit pattern is arranged, the first circuit pattern having a first transmittance, the second mask pattern region being a region in which the mark pattern to be used to measure a superposition between films is arranged, the mark having a second transmittance; developing the photosensitive film so that the first circuit pattern and the mark pattern are transferred to the photosensitive film, the transferred first circuit pattern having a first film thickness, the transferred mark pattern having a second film thickness, the second film thickness being thinner than the first film thickness.