Patent Number: 
Section: claims

1. A charged particle beam writing method for writing a pattern on a substrate by irradiating the substrate with a charged particle beam, the substrate being placed on a movable stage and coated with resist, the method comprising:writing a first evaluation pattern in a writing area located in central part of a first substrate having Charge Dissipation Layer (CDL) on resist while stopping the stage to calculate, based on a position of the written first evaluation pattern, a first correction coefficient for correcting a positional error;correcting a writing position in a writing area located in central part of a second substrate having no CDL on resist using the first correction coefficient and writing a second evaluation pattern in the writing area of the second substrate while stopping the stage to calculate, based on a position of the written second evaluation pattern, a second correction coefficient for correcting a positional error;correcting a writing position in a writing area located in central part of a third substrate having CDL on resist using the first correction coefficient and writing a third evaluation pattern in the writing area of the third substrate while moving the stage to calculate, based on a position of the written third evaluation pattern, a third correction coefficient for correcting a positional error;correcting a writing position in a writing area larger than central part of a fourth substrate having CDL on resist using the first correction coefficient and writing a fourth evaluation pattern in the writing area of the fourth substrate while stopping the stage to calculate, based on a position of the written fourth evaluation pattern, a fourth correction coefficient for correcting a positional error; andcomputing a corrected position, at which positional deviation of the charged particle beam is corrected, on a surface of the substrate using the first, second, third, and fourth correction coefficients and irradiating the corrected position with the charged particle beam to write a predetermined pattern. 2. The method according to claim 1, further comprising, before calculating the first correction coefficient:scanning the charged particle beam over a reference mark disposed on the stage and adjusting, based on a scanning result, a shape of a deflection field for a deflector that deflects the charged particle beam. 3. The method according to claim 1, wherein the second evaluation pattern is written on each of a plurality of the second substrates coated with different types of resist to calculate the second correction coefficient for each type of resist. 4. The method according to claim 1, wherein the third evaluation pattern is written on each of a plurality of the third substrates including different types of metal light-shielding layer underlying the resist while a moving speed of the stage is being changed for each third substrate to calculate the third correction coefficient for each type of metal light-shielding layer. 5. A charged particle beam writing method for writing a pattern on a substrate placed on a movable stage and coated with resist by irradiating the substrate with a charged particle beam, the method comprising:writing a first evaluation pattern in a writing area located in central part of a first substrate having CDL on resist while stopping the stage to calculate, based on a position of the written first evaluation pattern, a first correction coefficient for correcting a positional error;correcting a writing position in a writing area located in central part of a second substrate having no CDL on resist using the first correction coefficient and writing a second evaluation pattern in the writing area of the second substrate while stopping the stage to calculate, based on a position of the written second evaluation pattern, a second correction coefficient for correcting a positional error;correcting a writing position in a writing area located in central part of a third substrate having no CDL on resist using the first and second correction coefficients and writing a third evaluation pattern in the writing area of the third substrate while moving the stage to calculate, based on a position of the written third evaluation pattern, a third correction coefficient for correcting a positional error;correcting a writing position in a writing area larger than central part of a fourth substrate having no CDL on resist using the first, second, and third correction coefficients and writing a fourth evaluation pattern in the writing area of the fourth substrate while moving the stage to calculate, based on a position of the written fourth evaluation pattern, a fourth correction coefficient for correcting a positional error; andcomputing a corrected position, at which positional deviation of the charged particle beam is corrected, on a surface of the substrate using the first, second, third, and fourth correction coefficients and irradiating the corrected position with the charged particle beam to write a predetermined pattern. 6. The method according to claim 5, further comprising, before calculating the first correction coefficient:scanning the charged particle beam over a reference mark disposed on the stage and adjusting, based on a scanning result, a shape of a deflection field for a deflector that deflects the charged particle beam. 7. The method according to claim 5, wherein the second evaluation pattern is written on each of a plurality of the second substrates coated with different types of resist to calculate the second correction coefficient for each type of resist. 8. The method according to claim 5, wherein the third evaluation pattern is written on each of a plurality of the third substrates including different types of metal light-shielding layer underlying the resist while a moving speed of the stage is being changed for each third substrate to calculate the third correction coefficient for each type of metal light-shielding layer.