| 摘要 |
PURPOSE:To form a magnetic latent image without reducing a mechanical strength of a recording body by a simple constitution by using a rotary magnet as an alternating magnetic field generating means, and heating a magnetic recording body in the shape of a picture in an alternating magnetic field by the rotary magnet. CONSTITUTION:A magnetic recording body 4 is provided with a magnetic material layer 2 which can be magnetized, on a non-magnetic base layer 1, and formed in the shape of an endless belt. A rotary magnet 14 formed by placing alternately a magnetic pole of a different polarity on the outside circumference is provided as an alternating magnetic field generating means 10 in a sleeve 13. A uniform magnetic field is impressed to the magnetic recording body 4 by the rotary magnet 14, and in its state, a thermal pattern is impressed through a thermal head 5, and a magnetic latent image is formed on the recording body 4 by a heat residual magnetizing phenomenon. In that case, since the rotary magnet 14 is used, an attenuation factor to a distance of the alternating magnetic field is small, therefore, a comparatively thick recording body can be used, and a latent image can be formed without reducing a mechanical strength. |
