| 摘要 |
<p>PURPOSE:To obtain an FG function with high accuracy by providing a fixed slit plate, a rotating slit plate, a light emitting element and a receiving element, which are arranged so as to face the plates, and a C-shaped spring ring, which holds the fixed slit plate in a capstan bearing housing. CONSTITUTION:A slit part 23 of a fixed slit plate 16 is positioned at the C- shaped open part of a C-shaped spring ring 25. Thus, since the slit part 23 and a slit part 24 are provided near the utmost external circumference of the slit plate, the FG function with high accuracy can be obtained even when the titled device is miniaturized. The slit part of a fixed slit plate 16 is supported by a fine projecting stage part 28 provided at a fitting surface in a capstan bearing housing 2, and the slit part of the fixed slit plate 16 is pressed and positioned at the projecting stage part by suitable press-contact force. Thus, the capstan device with highly-accurate FG can be obtained.</p> |
