| 摘要 |
PURPOSE:To decrease the abrasive degree of a video scanning stylus and to increase its lifetime, by forming nearly a sagittal bottom surface for the scanning stylus at the part that touches a track and increasing the width of an electrode which extends to the sagittal bottom surface with a prescribed angle. CONSTITUTION:A scanning stylus 21 touching the concentric tracks of a video disk has nearly a sagittal bottom surface 24 at its contact surface. Then a metal is vapor-deposited on the surface of hatching shown in the diagram to be used as an electrode forming surface 23. The 1st electrode surface 26 which detects information recorded on the track is inside the surface 24 and extends with a prescribed angle 27 and with nearly a certain width to reach the 2nd electrode surface 28. Thus the information is reproduced. The width of the surface 26 can be increased within a prescribed value and in a region 40 ranging from the surface 24. Thus the abrasive degree of the stylus is decreased. Furthermore, the abrasive degree is also reduced from a square pillar material 22 of diamond since the side ridges 30a and 3ab of the part 24 are gentle. |
