Analysis of the Magnetic Force Acting on the Magnetic Toners from the Adjoining Magnetic Transition Regions in Magnetography

Abstract

This paper describes the magnetic force acting on the magnetic toners from the magnetic latent images of the adjoining magnetic transition regions with longitudinal recording. It is found that large magnetic force emerges around each center of the transition regions, whereas magnetic force becomes zero in the middle region between the adjoining transition regions. According this result, it seems that magnetic toners might be attracted only the near region of the center of the transition regions and no toner in the middle region between the adjoining transition regions. Experimentally, however, the toners cover the latter region also. Here, a new model is introduced. In the model, a closed magnetic circuit is formed comprising magnetic toners and the recording medium. The toners are attracted each other due to magnetic induction to form toner bridge between the adjoining transition regions. It is found that the magnetic attracting force in the toner bridge is about 300 times larger than the gravitational force.