Self-contained detector device for checking information recorded on a carrier
US4868374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Mar 30, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B7/063
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A self-contained detector device for educational or amusement purposes cooperates with conducting and non-conducting zones of a carrier. The detector is in the form of an elongated hollow body with a reading or detecting head projecting from one end. The head is rigidly mounted on a printed circuit board that travels slidably in the hollow body. When the detector is in use on the carrier, pressure causes the head and board to slide up into the body and close a spring switch, energizing a detecting circuit on the board and coupled to the head. The head can favorably be formed as a stack of alternate conducting and non-conducting sheets. The non-conducting sheets can be of an elastomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.