Small fingerprint acquirer

Abstract

The invention discloses a small fingerprint acquirer which is characterized in that an image acquisition unit comprises a photoelectric transducer unit and an automatic detection main control unit, wherein an independent imaging lens is arranged on a light path between a prism and a plane reflector and can be a camera lens with an adjustable focus, an imaging lens set is arranged in the imaging lens, a light source also comprises a light signal transmitting pipe and a light signal receiving pipe, a shell also comprises a bracket for fixing the imaging lens and the imaging objective lens, and a cover is fixed below a main shell by adopting a gluing manner. By adopting design of the light path which carries out two times of convergence on light rays with the adjustable focus and comprises the imaging lens, the plane reflector and the imaging objective lens, thus the space utilization efficiency can be further improved, the cost is further saved, the miniaturization of the small fingerprint acquirer is more effectively realized, the definition of the acquired image is improved, and the efficiency and the accuracy of acquiring and comparing fingerprints are further improved. In addition, the fingerprint acquisition unit has a function of automatically detecting the fingerprints, thus the power consumption of the small fingerprint acquirer is reduced and the problem of dazzling when a visible light diode illuminates is solved.

Description

technical field [0001] The invention relates to a device for fingerprint identification using an electronic circuit, in particular to a small fingerprint collector. Background technique [0002] The applicant's prior patent CN102043947A discloses "A Small Fingerprint Collector", which includes a casing and an optical fingerprint imaging module arranged in the casing, and the optical fingerprint imaging module includes a prism arranged along the optical path and an imaging objective lens , an image acquisition unit and a light source, the prism is a uniform and symmetrical six-sided trapezoidal prism whose longitudinal section bottom is greater than the height, including a large end face, a small end face, a lower side and the remaining three sides parallel to each other, the large The end face is an image acquisition surface, the small end face is a light source incident surface, and the lower side is an imaging surface opposite to the imaging objective lens. Mirror, the li...

AI Technical Summary

Problems solved by technology

However, there are still problems that do not meet the needs, mainly in the following aspects: 1) The optical path design is not reasonable, the fingerprint image is distorted, the image is not clear enough, and the effective user fingerprint is difficult to be safely identified, which brings inconvenience to the normal use of the user ;2) It is bulky and heavy, and is not suitable for use with devices with limited installation space such as mice, keyboards, and door locks; 3) The lighting circuit board uses visible light-emitting diodes. When there is no finger contact, the fingerprint collection device is not in a dormant state , the lighting circuit is still working, it is more dazzling when viewed by human eyes, and it is not very comfortable

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