| 摘要 |
PURPOSE:To improve the grinding efficiency and to stabilize the ground shape of styluses, by using a grinding disc provided with plural kinds of spiral or concentric grinding grooves at different intervals on the same plane and properly using the grinding grooves. CONSTITUTION:A grinding disc 1 is provided with grinding grooves 2a, whose ratio W/P of the groove width W to groove interval P is smaller, and grinding grooves 2b, whose ratio W/P is larger, and a projected section with an effective electrode part width which is eseveral times wider than a desired electrode widt lis manufactured at the end of a triangular-pyramidal stylus base body 7 by using the grinding grooves 2b having the larger ratio W/P and then the projected section 5 is guided to the grinding grooves 21 having the smaller ratio W/P and ground to the desired electrode width l. When an information signal reproducing stylus is ground (finish grinding) to the desired shape after a projected section which becomes the guide of the finish grinding groove is formed (rough grinding) by properly using the two kinds of grinding grooves having different pitches, grinding of excellent reproducing styluses becomes possible. |
