Patent ID: 8289384

Claim:
An electron beam recording apparatus, in which a beam spot of an electron beam is converged on a recording surface to form a recording pattern on the recording surface, said recording apparatus, comprising: a beam deflection unit; a beam position correcting unit; and a measuring device for measuring a changing amount of a beam position when a beam displacement is measured prior to a recording operation performed by said recording apparatus, said measuring device comprises: a knife edge disposed at an irradiating position of the beam spot; detecting means for detecting an electron beam irradiating through the knife edge; a high frequency cut filter removing a changing frequency component of measurement subject from an output of the detecting means; and control means for controlling a reference position of the electron beam in accordance with an output from the filter so that the center of the beam spot is at the front end position of the knife edge, in which a displacement of the beam spot is measured in accordance with an output change of the detecting means when the center of the beam spot deviates from the front end of the knife edge, the control of the reference position is performed in accordance with an output in which a changing frequency component of measurement subject has been removed from the detected current.