| 摘要 |
<p>PURPOSE:To improve the magnetic generation efficiency as well as a heat radiation effect and to elevate the magnetic utilization efficiency by forming a slender magnetic coil which is wound at a magnetic core part and by making a magnetic flux discharge part and the magnetic core part have structures comprising stepped parts. CONSTITUTION:When a magnetic coil 32 is energized by supplying a current, magnetic flux is supplied from a magnetic core part 34 to a magnetic flux leading out part 37 through a coupling part 38 and is discharged toward a region where the light beam of a photo- electromagnetic recording film 24 can be irradiated from a magnetic flux discharge plane 37A located at a lower plane of the magnetic flux leading out part 37. Then, the photoelectro- magnetic recording film 24 is exposed to magnetic flux that is perpendicular to its plane. Magnetic flux which is passing through its film 24 enters into a yoke 39 through a space and is feedback to the magnetic core part 34 which is magnetically and mechanically coupled to the yoke. In such a structure, the magnetic coil 32 is so slender that a great magnetomotive force is obtained by less electricity consumption and its heat radiation effect is also excellent. Since the magnetic flux leading out part 37 and the magnetic core part 34 have stepped parts, its configuration allows the magnetic flux discharge plane 37A to approach sufficiently an information recording medium 20 and the magnetic utilizastion efficiency can be elevated.</p> |
