FINGERPRINT IMAGE CAPTURING DEVICE AND FINGERPRINT IMAGE CAPTURING MODULE THEREOF

摘要

A fingerprint image capturing module includes a light-emitting element, a first optical element having two light-reflecting structures and a light-guiding structure, a second optical element, a lens assembly, and a fingerprint image sensing element. A projection light beam generated by the light-emitting element is projected onto the light-reflecting structure, the projection light beam is reflected by the light-reflecting structure to form an illumination light beam that passes through a light-transmitting element and is projected onto a fingerprint. The illumination light beam is reflected by the finger to form an image light beam that is projected onto the light-guiding structure and guided by the light-guiding structure, the image light beam passes through the lens assembly and is projected onto the fingerprint image sensing element through the second optical element, and the fingerprint image sensing element receives the image light beam to obtain a fingerprint image of the fingerprint.

主权项

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:
at least one light-emitting element electrically connected to the circuit substrate;a first optical element disposed beside one side of the at least one light-emitting element and separated from the at least one light-emitting element by a first predetermined distance, wherein the first optical element has two light-reflecting structures and a light-guiding structure connected between the two light-reflecting structures;a second optical element disposed beside another side of the at least one light-emitting element and separated from the at least one light-emitting element by a second predetermined distance;a lens assembly disposed between the at least one light-emitting element and the second optical element; anda fingerprint image sensing element disposed under the second optical element and electrically connected to the circuit substrate; wherein a projection light beam generated by the at least one light-emitting element is directly projected onto the two light-reflecting structures, the projection light beam is reflected by the two light-reflecting structures to form an illumination light beam that first passes through the light-transmitting element and then is projected onto a fingerprint of a finger; wherein the illumination light beam is reflected by the finger to form an image light beam that is projected onto the light-guiding structure and then is guided by the light-guiding structure, the image light beam first passes through the lens assembly and then is projected onto the fingerprint image sensing element through the second optical element, and the fingerprint image sensing element receives the image light beam to obtain a fingerprint image of the fingerprint of the finger.