Hand-held barcode label reader with increased depth of field
US5397885A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1993 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Dec 29, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10881
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A barcode label reader comprises a read window having a longer dimension parallel to an X axis and a lens system with an optical axis Y substantially normal to the window at its center which projects a conjugate image of a read line of the label onto a CCD type strip which is scanned sequentially to form a signal representing the barcode carried by the label. A strip of light-emitting diodes is disposed outside the X-Y plane to illuminate the label through the read window. A prismlike lens in the form of two refractors separated by a slot in the X-Y plane deflects the beam emitted by this strip so that it is substantially parallel to the X-Y plane. Thus, the depth of field of the reader is limited only by the aperture of the lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.