Patent ID: 8599416

Claim:
An image forming apparatus for obtaining an image comprising: a first control part; a first storing part provided to the first control part, said first control part being configured to control storing of image data in the first storing part and control a data transfer between the first storing part and a second control part; a writing engine for forming an image based on the image data; a second storing part configured to receive line data of the image data from the first storing part and store the image data; and an image control part configured to manage addresses of the first storing part when the first storing part stores the image data, and including a line counter configured to count the line data to be stored in the second storing part, wherein the first control part is configured to control the image control part so as to control storing of a part of the image data stored in the first storing part into the second storing part; the image control part is configured to start reading the image data from the second storing part for starting image forming operation, when data stored in the second storing part reaches a data amount so that the image data is continuously transferred to the writing engine from the second storing part at a predetermined transfer rate, and the image control part is further configured to obtain the data amount according to a length of time which a data access between the second control part and the first storing part requires and a size of sheet on which the image is formed.