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FINGERPRINT IMAGE CAPTURING DEVICE AND FINGERPRINT IMAGE CAPTURING MODULE THEREOF

  • US 20150347813A1
  • Filed: 07/30/2014
  • Published: 12/03/2015
  • Est. Priority Date: 05/28/2014
  • Status: Active Grant
First Claim
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1. A fingerprint image capturing device, comprising:

  • a circuit substrate;

    an external casing disposed on the circuit substrate, wherein the external casing has a top opening formed on the top side thereof;

    a light-transmitting element disposed on the external casing to enclose the top opening of the external casing; and

    a fingerprint image capturing module disposed inside the external casing, wherein the fingerprint image capturing module includes;

    a light-emitting element electrically connected to the circuit substrate;

    a light-splitting element disposed in front of the light-emitting element;

    a first light-reflecting element disposed beside one side of the light-splitting element and separated from the light-splitting element by a first predetermined distance, wherein the first light-reflecting element has a light-reflecting curved surface;

    a second light-reflecting element disposed beside another side of the light-splitting element and separated from the light-splitting element by a second predetermined distance;

    a lens assembly disposed between the light-splitting element and the second light-reflecting element; and

    a fingerprint image sensing element disposed under the second light-reflecting element and electrically connected to the circuit substrate;

    wherein a projection light beam generated by the light-emitting element is reflected by the light-splitting element and the light-reflecting curved surface of the first light-reflecting element in sequence to form an illumination light beam that first passes through the light-transmitting element and then is projected onto a fingerprint of a finger, the illumination light beam is reflected by the finger to form an image light beam that is projected onto the light-reflecting curved surface and then is reflected by the light-reflecting curved surface, the image light beam first sequentially passes through the light-splitting element and the lens assembly and then is projected onto the fingerprint image sensing element through the second light-reflecting element, and the fingerprint image sensing element receives the image light beam to obtain a fingerprint image of the fingerprint of the finger.

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