| 摘要 |
The method includes the steps of: adjusting pulse width signals for controlling light beam emission of a laser beam generator; forming latent patch image, composed of plural latent line images, on a photoreceptor by irradiating light beam from the laser beam generator; developing the latent patch image with toner so as to form a toner patch image composed of toner line images; repeating the forming step of the patch latent image and the step of developing the patch latent image to form the toner patch image for plural times, in which the toner patch image in each time has a different gradation from that in other times, so that a series of toner patch images is formed on the photoreceptor; measuring optical density of the series of toner patch images so as to obtain a variation curve of the optical density; detecting an inflection point in the variation curve of the optical density in use with index signals for controlling the laser beam generator; and adjusting the line width of the toner image according to data of the inflection point. <IMAGE> |
