Electric starting sensor for battery-operated coin acceptors
US5454463A · kind A · utility
Inventor
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An inductive starting sensor for a battery powered coin acceptor includes an oscillator whose output signal changes when a coin passes through the area of the starting sensor. The sensor includes a capacitor which can be discharged via a resistor. The capacitor is periodically charged via a transistor connected to the oscillator in an emitter follower circuit. The transistor becomes currentless upon a diminution of the oscillator voltage due to the damping of the inductance of the oscillator on account of a passing coin. A further transistor generates a starting signal for the coin acceptor when the first transistor becomes currentless.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.