Optical Code Scanner With a High Dispersion Optical Lens

摘要

An optical code scanner is presented that includes image capture technology to scan optical codes. The image capture technology uses a fixed aperture, a fixed standard optical lens, a fixed high dispersion optical lens and at least one illumination device that generates different colors of light. Together, these elements increase the effective depth of field of the optical code scanner by capturing images of an item presented to the optical code scanner using different colors of light.

主权项

1. A method of operating an optical code scanner to increase the depth of field for reading optical codes without moving optical elements, the method implemented by a digital processor within the optical code scanner, the method comprising:
causing a plurality of illumination devices to emit a first narrow band of light directed to a scanning area of the optical code scanner for a first time period; capturing an image of the scanning area during the first time period wherein the image passes through a high dispersion optical lens before being captured; causing a plurality of illumination devices to emit a second narrow band of light directed to the scanning area of the optical code scanner for a second time period wherein the second narrow band of light is at a wavelength different from the first narrow band of light; capturing an image of the scanning area during the second time period wherein the image passes through the high dispersion optical lens before being captured; processing the captured images to decode an optical code; causing a plurality of illumination devices to emit a third narrow band of light directed to the scanning area of the optical code scanner for a third time period wherein the third narrow band of light is at a wavelength different from the first and second narrow band of light; and capturing an image of the scanning area during the third time period wherein the image passes through the high dispersion optical lens before being captured.