Patent ID: 6868248

Claim:
An image formation apparatus, comprising: a belt-shaped member having only one mark to be used for position detection; a mark sensor configured to detect said mark on said belt-shaped member; a plurality of holding members, each of which is configured to rotatably hold said belt-shaped member; a drive unit configured to drive said holding members; a measurement unit configured to start measuring time each time said mark sensor detects said mark; a control unit configured to control rotation and stopping of said drive unit, based on the time measured by said measurement unit, in such a manner that said belt-shaped member stops in at least two different positions; a plurality of latent image carriers, each of which is configured to form a latent image of a decomposed image on a surface of a respective latent image carrier; and a plurality of development units configured to develop the latent image using a developer provided in a respective development unit; wherein the belt-shaped member is configured to function as an intermediate transfer body that contacts the latent image carriers, and on which a composed image is formed, by transferring and composing successively-superimposed decomposed images that have been developed.