| http://www.w3.org/ns/prov#value | - In such a manner as stated above, and with reference to FIG. 4, when the full color image is formed, a controller unit (hereinafter referred to as an LD unit) 56 of the laser optical system 5 is driven by a laser driver (hereinafter referred to as an LD driver) 57 of the laser optical system 5 in accordance with a datum of a registration mark image, to form a latent image of the registration mark
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