| 摘要 |
PURPOSE:To make a main and a sub scanning mechanisms unnecessary, to miniaturize a device, and to lower a price, by using a plate shaped magnetic material in addition to an on-going electromagnet. CONSTITUTION:The write of a information is performed by projecting a light spot on the surface of a card 3 via a polygonal mirror 5 and a lens array 4. At this time, since the direction of the magnetic field of a plate shaped magnetic medium 2 arranged in parallel with the projecting direction Y of the polygonal mirror 5 is set in a constant direction, the information is written on the part of a recording bit 31 on which the light spot is projected. When it is desired to erase a record at an adjacent recording bit 31' simultaneously, it is enough to set the plane shaped magnetic material 2 so that the direction of the magnetic field of the plane shaped magnetic material 2 can be set in a direction opposite to that at the time of recording. Thus, by using the plate shaped magnetic material 2 as a magnetic material to apply the magnetic field, it is possible to reduce the number of scanning mechanisms and to realize the miniaturization and the low price of the device.
|
