( 10357 of 10357 ) |
United States Patent | 3,571,685 |
Akins , et al. | March 23, 1971 |
The physical displacement of a movable medium is indicated by the content of a bidirectional counter. The counter is incremented or decremented by direction-oriented pulses relating to movement of the medium, these pulses being selectively gated into the counter. The content of the counter can control an operational amplifier to provide an indication of the position of the medium relative to a null point represented by any selected count in the counter.
Inventors: | Akins; Vaughn E. (Boulder, CO), Harris; John P. (Boulder, CO), Kost; Frederick H. (Boulder, CO) |
Assignee: |
International Business Machines Corporation
(Armonk,
NY)
|
Appl. No.: | 04/697,853 |
Filed: | January 15, 1968 |
Current U.S. Class: | 318/603 ; 318/375; 318/461; G9B/15.012; G9B/27.022 |
Current International Class: | G11B 27/13 (20060101); G11B 27/11 (20060101); G11B 15/05 (20060101); G05D 3/20 (20060101); G11B 15/093 (20060101); G05b 019/28 () |
Field of Search: | 318/20.32 (Unofficial)/ 318/603,375,461 |
2537427 | January 1951 | Seid et al. |
2727194 | December 1955 | Seid |
2878434 | March 1959 | Brown |
2926335 | February 1960 | Bowey |
2947929 | July 1960 | Bower |
3206665 | September 1965 | Burlingham |
3309597 | March 1967 | Gabor et al. |
3328658 | June 1967 | Thompson |