Method of and apparatus for developing a latent magnetic image.

摘要

A method of developing a latent magnetic image in which a layer of magnetically attractable toner powder having a specific resistance less than 10<9>ohms.metre is conveyed by a toner conveyor in a developing zone past a medium carrying the latent image and an AC voltage is applied between the toner conveyor and the medium carrying the latent image. The apparatus comprises an image-recording medium (1), means (2) for recording a latent magnetic image on the medium, a toner powder conveyor (9) and a metering device (10) for metering a layer of toner powder on the toner powder conveyor (9). The shortest distance A (in mm) between the toner powder conveyor (9) and the image-recording medium (1) is between B + 0.6 and B + 1.6 mm, where B is the shortest distance in mm between the metering device (10) and the toner powder conveyor (9).