Multicolor printer using magnetic and positive and negative electrostatic charging

Claim 1

A multicolor printer capable of printing record data by using the three primary colors of cyan, yellow and magenta either singly or by subtractive color mixing, comprising: a recording drum supported for rotation about its axis, said recording drum having on its surface a conductive material layer, an insulating material layer superposed over the conductive material layer and a magnetizable material portion; magnetic recording means located in spaced juxtaposed relation to the outer peripheral surface of the recording drum to form on the magnetizable material layer of the recording drum a magnetic latent image of record data corresponding to a first primary color constituting color designating data as the recording drum rotates; electrostatic recording means located in a spaced juxtaposed relation to the outer peripheral surface of the recording drum to form on the insulating material layer of the recording drum a positive electrostatic latent image and a negative electrostatic latent image based on record data corresponding to a second primary color and a third primary color respectively constituting the color designating data as the recording drum rotates; developing means for developing the magnetic latent image and the electrostatic latent image on the recording drum in desired colors conforming to the color designating data to produce a multicolored image conforming to the record data; and transfer printing means for printing on a sheet of support material by transferring the multicolored image conforming to the record data from the recording drum to the sheet of support material to provide a multicolored printout of the record data.