| 摘要 |
PURPOSE:To prevent a pair of magnetic material block from causing positional deviation by making glass fusion by irradiating laser light on glass. CONSTITUTION:Two ferromagnetic material blocks 21, 22 and a pressing plate 4 are put in a nipping jig 1 and the pressing plate 4 is pressed by screwing a bolt 5 from the side wall 2, and the ferromagnetic material blocks 21, 22 are nipped from both sides by the side wall 3 of the nipping jig 1 and the pressing plate 4. Laser light L is irradiated on glass 25 of a glass fitting part 24 from a laser light irradiating device 6 and a laser light irradiating device 7 in the upper part, and only glass 25 is heated and melted to join the two ferromagnetic material blocks 21, 22. The wavelength of laser light is bout 0.8-10.0mum which is absorbed only by glass 25, and ferromagnetic material blocks 21, 22 and the nipping jog 1 are hardly heated, and thermal expansion is hardly caused. Accordingly, loosening of nipping force of ferromagnetic material block 21, 22 does not occur, and nipping force is maintained almost constant.
|
