Patent ID: 7638244

Claim:
A method of correcting mask data which performs a proximity effect correction process to a pattern shape of a photomask to form a photosensitive material film provided on a substrate to be processed or a film to be processed by using the photosensitive material film as a mask to pattern the film to be processed into a desired shape, the method comprising: performing a model-based proximity effect correction to a gate forming pattern of the photomask to correct the pattern shape of the photomask; and performing a rule-based proximity effect correction to a portion of the gate forming pattern subjected to the model-based proximity effect correction to further correct the pattern shape of the photomask, the portion of the gate forming pattern corresponding to a portion of a pattern, at which portion a necking is generated, obtained when the gate forming pattern subjected to the model-based proximity effect correction is transferred to the photosensitive material film or the film to be processed.