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Barcode-reading attachment for focusing a camera of a mobile device

  • US 9,922,221 B2
  • Filed: 10/29/2014
  • Issued: 03/20/2018
  • Est. Priority Date: 10/04/2012
  • Status: Active Grant
First Claim
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1. A barcode reading enhancement system for a mobile device, the mobile device being selected from the group consisting of smartphones, tablets, and hybrid combinations thereof, the mobile device comprising a processor, a display screen, a camera comprising a camera lens, and memory, the barcode reading enhancement system comprising:

  • an attachment securable to an external surface of the mobile device, the attachment comprising an optic system within a camera field of view of the camera;

    a barcode reading lens system comprising the camera lens and the optic system of the attachment, the barcode reading lens system having a system field of view and at least one of (i) for at least one distance away from the barcode reading lens system along a system optical pathway, a system depth of field of the barcode reading lens system longer than a depth of field of the camera operating without the attachment and (ii) a ratio of focal length of the barcode reading lens system to entrance pupil diameter of the barcode reading lens system greater than a ratio of focal length of the camera operating without the attachment to entrance pupil diameter of the camera operating without the attachment; and

    a mobile barcode reading application comprising executable code stored in the memory and, when executed by the processor;

    performing at least one of;

    i) setting a camera lens of the camera to one of a plurality of predetermined focus positions; and

    ii) enabling autofocus of the camera within a limited range of focus positions less than a full range of focus positions of the camera;

    causing the camera to capture an image of a barcode within the system field of view; and

    decoding the image of the barcode.

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