Patent ID: 6337738
Filing Date: 2002-01-08
Classification: B41J,G06K

Abstract:
A position detecting method for detecting a position of each light emitting element of a print head having a plurality of light emitting elements arranged along one direction, said position detecting method comprising:lighting selected light emitting elements among the plurality of light emitting elements; measuring luminous power emitted from the light emitting elements by making a light receiver scan in the direction of arrangement of the light emitting elements; obtaining a data series indicating luminous power based on the results of said step of measuring; comparing the data series with a threshold and detecting a first place that exceeds the threshold from the beginning of the data series; determining a position of a maximum value closest to the first place as a first light emitting element position among the lighted light emitting elements; and determining additional positions of maximum value as light emitting element positions in terms of the positions of the light emitting elements after the first light emitting element position.