Patent ID: 6373514
Filing Date: 2002-04-16
Classification: B41J,G06K

Abstract:
A method of testing a light emission condition of an exposing head of a type including a plurality of luminous element arranged along a main scanning direction for forming a linear dot pattern on a print paper, the exposing head being movable relative to the print paper in a sub scanning direction, the method comparing emission amounts of the respective luminous elements relative to each other based on the absolute densities of respective dots obtained by exposure on the print paper, the method comprising the steps of:(1) a first step of forming latent images of testing target dots on the print paper by driving luminous elements selected as target elements which are not adjacent each other in the main scanning direction; (2) a second step of forming latent images of background dots in the peripheries of the latent images of the target dots so that the peripheries are completely filled with the latent images of the background dots with a density above a predetermined value; (3) a third step of developing the latent images of the target dots and the background dots formed on the print paper and subsequently determining the absolute densities of the respective developed images of the target dots by using a scanner; and (4) a fourth step of outputting the absolute density of each one of the target dots obtained by the third step as a light emission amount of each corresponding luminous element selected as one of the target elements; wherein the developed background dots with a density above the predetermined value obtained by the second and third steps restrict a phenomenon of the determination of absolute densities by using the scanner being influenced by refection of an irradiating beam from the scanner in the peripheries of the target dots.