Patent ID: 8029084
Filing Date: 2011-10-04
Classification: B41J

Abstract:
1. An image forming system that forms a dot pattern for a digital pen which has an ink unit, a reading unit which optically reads the dot pattern, and an information transmission unit which transmits information read by the read unit to the outside, wherein the information can be obtained by the reading unit according to trace of user's writing or drawing on paper on which the dot pattern is formed using the digital pen, the image forming system comprising: an image forming unit which forms an image; a controller which controls the image forming unit to form a plurality of dot patterns having density different from each other in a plurality of image forming conditions for density different from each other, the density different from each other of the plurality of dot patterns including low density that cannot be read by the reading unit wherein the reading unit of the digital pen reads each of the dot patterns, and the plurality of dot patterns formed by the controls of controller, and wherein the controller controls the image forming condition for density of subsequent formation of the dot pattern by using an image forming condition for density corresponding to a dot pattern with the lowest density among the plurality of dot patterns which can be read by the reading unit, wherein the image forming condition for density includes at least one of charge bias, exposure amount, and transferring bias, and wherein the controller controls said at least one of charge bias, exposure amount, and transferring bias to control the image forming condition.