Abstract: There will be provided a printing method for block copy film and a block copy printer capable of adjusting printing density as occasion arises as well as making joints between print lines inconspicuous. A predetermined mount of conveyance of transparent resin film P will be set to 1/N (N is an integer of 2 or more) of a predetermined printing width, which is a line-up width of the exothermic elements, and printing at a predetermined printing width will be repeated after the transparent resin film P is conveyed in the predetermined amount of conveyance.

Abstract: A thermal printer comprises a plurality of heating elements for heating a recording medium to form an image thereon, an electric motor for transporting the recording medium to a direction opposite to a subscanning direction by rotating a predetermined angle each time a driving pulse is input, and an activating control section for dividing the plural heating elements into a plurality of groups and for activating every the groups of the heating elements in sequence asynchronously such that the sequential activating of all the groups is repeated more than once while each time the driving pulse is turned on.