| 摘要 |
1,079,084. A/D converters. GENERAL PRECISION Inc. Nov. 29, 1965 [Jan. 6, 1965], No. 50603/65. Heading G4H. A shaft position encoder comprises a disc 20 of grain oriented anisotropic barium ferrite having code tracks 26, 28, 30 formed by magnetizing with the same polarity discrete portions near each face of disc 20. Each track is sensed by a magnetic core 54 having an interrogating winding 56 and an output winding 58. When a core 54 is adjacent a magnetized portion of a track, the magnetic flux emanating from the track saturates the core and no output is obtained from winding 58. Additional concentric continuous tracks 53 prevent flux from one track wandering towards an adjacent track. The least significant track may be formed by alternately oppositely polarized segments with narrow non-magnetized areas between them, Figs. 9-11 (not shown). The output of the sensing core varies continuously as the track moves past, and a squared output is obtained from a threshold device. |
