Information retrieval system having ramp motor control
US4066349A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Oct 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/0019
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to a scanning means for use in an information retrieval system for locating a preselected information bearing element out of a plurality of information bearing elements which are consecutively numbered for identification. The scanning means includes a ramp generator which generates a ramp voltage, drive means for driving the information bearing elements in first and second directions at a rate substantially proportional to the magnitude of the ramp voltage, sensing means for sensing the elements as they are driven, means for causing the drive means to drive the information bearing elements in the first or second direction towards the selected element, means for resetting the ramp generator when the drive means drives the selected element past the sensing means and disabling means for disabling the ramp generator when the selected information bearing element has been located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.