Patent ID: 6084607
Filing Date: 2000-07-04
Classification: B41J

Abstract:
An ink-type image forming device having a plurality of recording heads mounted thereon which are moved to form an image on a recording medium, said ink-type image forming device, comprising:a test pattern printing means for printing a predetermined test pattern on the recording medium by the use of said plurality of recording heads;a reading means for reading the test pattern, which has been printed by said test pattern printing means, by optically scanning the test pattern;a mounting-position-error detection means for detecting, with respect to a reference head being one of said plurality of recording heads, deviations in position of the recording heads other than said reference head; andsaid reading means including a light emitting element for projecting light onto the recording medium, and first and second light receiving elements which are disposed spaced apart from each other by a predetermined distance;said mounting-position-error detection means including a subtraction means for subtracting an output of one of said first and second light receiving elements from an output of the other, and means for determining the deviations in position on the basis of a subtracted result.