Optical reader with vibrating mirror
US5610752A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1995 |
| Grant date | Mar 11, 1997 |
| Priority date | — |
| Expiry date | Mar 16, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10653
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Systems embodying the invention include a vibrating arm having one side on which is mounted a reflective surface for sweeping a beam of light across a target whose contents are to be read. The vibrating arm includes a bar of magnetic material pivoted about its center so as to be able to rotate freely (i.e., be "movable"). The ends of the "movable" bar are located between the side walls of a stationary (i.e., non-moving or fixed) yoke of magnetic material with a driving coil located between the ends of the movable bar and the side walls of the stationary yoke. The stationary yoke is of magnetic material for concentrating a magnetic field encompassing the movable bar, the coil and the stationary yoke. The combination of the movable bar and the yoke are configured to produce a magnetic field such that with no current in the driving coil, the movable bar has a defined equilibrium (or rest) position and when the movable bar is displaced from its equilibrium position a magnetic restoring torque is present such that the movable bar oscillates about its equilibrium, position. In a preferred embodiment the bar is a permanent magnet and the yoke is made of magnetic material. A varying curren…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.