High-definition infrared fingerprint acquisition device

A fingerprint collector, high-definition technology, applied in the direction of equipment, installation, optics, etc., can solve the problem that the definition cannot meet the requirements, and achieve the effect of not being interfered by external ambient light, low distortion rate, and clear image

Active Publication Date: 2012-05-02
DONGGUAN ZKTECO ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After using this patented product, it is found that there are still deficiencies. For example, the clarity cannot meet the requirements due to the texture of the fingerprint itself or other unfavorable conditions.

Method used

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  • High-definition infrared fingerprint acquisition device
  • High-definition infrared fingerprint acquisition device
  • High-definition infrared fingerprint acquisition device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example one, as Figure 1-4 As shown in the figure, the high-definition infrared fingerprint collector of the present invention is composed of an unequal trapezoidal prism 1 with a small base angle of 58° and a large base angle of 62°, and a single-color 850nm or 940nm wavelength of a weak green LED indicator light is arranged in the middle. Near-infrared LED light source plate 8, Huygens lens groups 31, 32, narrow-band infrared filter 16 with a center wavelength of 850nm or 940nm, a photodetector 4 with high infrared sensitivity, and a rectangle for shielding ambient light and supporting the above components It is composed of a plastic mold tube frame 51; the upper inclined port of the plastic mold tube frame 51 is equipped with a trapezoidal prism 1 with an inclined collection surface, and the fingerprint collection surface of the prism 1 and the end face of the upper inclined port of the tube frame 51 are on the same plane; the fingerprint collection optical path is a...

Embodiment 2

[0037] Example two, as Figure 5-7 As shown in the figure, the high-definition infrared fingerprint collector of the present invention consists of an unequal trapezoidal prism 1 with a small base angle of 58° and a large base angle of 62°, and a single-color near-infrared light with a wavelength of 850nm or 940nm with a weak green LED indicator in the middle. LED light source board 8, Huygens lens groups 31, 32, narrow-band infrared filter 16 with a center wavelength of 850nm or 940nm, photodetector 4 with high infrared sensitivity, and a rectangular mold for shielding ambient light and supporting the above components The pipe frame 51 is composed; the upper inclined port of the plastic mold pipe frame 51 is equipped with a trapezoidal prism 1 with an inclined collection surface, and the fingerprint collection surface of the prism 1 and the end face of the upper inclined port of the pipe frame 51 are on the same plane; the fingerprint collection optical path is followed by the ...

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Abstract

The invention relates to a high-definition infrared fingerprint acquisition device, and aims at solving the problems that the existing acquisition device is apt to be interfered by conditions and the definition cannot satisfy requirements. The high-definition infrared fingerprint acquisition device consists of a non-isosceles trapezoidal prism, a light source, lenses, a photoelectric detector and a plastic molded pipe support which is used for shielding ambient light and supporting the parts and has a rectangular cross section. The trapezoidal prism with an inclined acquisition surface is obliquely assembled on the plastic molded pipe support. A fingerprint acquisition light path sequentially consists of the trapezoidal prism, a Huygens lens set and the photoelectric detector. A fingerprint acquisition surface is arranged on the lower base surface of the trapezoidal prism, an oblique leg surface adjacent to the larger base angle of the trapezoidal prism is an optical transmission surface and the light source is configured on the upper base surface of the trapezoidal prism. The light source is an infrared light source. An oblique leg surface adjacent to the smaller base angle of the trapezoidal lens is used as an optical black substrate which is coated with black paint. An infrared light filter is additionally assembled between the lenses and the photoelectric detector or between the lenses. The upper base surface of the trapezoidal prism is a rough surface. The high-definition infrared fingerprint acquisition device has the advantages of high acquired image definition, evenness, small deformation rate, low distortion rate, high imaging quality, strong image contrast, bright lines, resistance to external ambient light interference, high dry and wet fingerprint acquisition sensitivity, simple structure and convenience in manufacturing, installation and use.

Description

technical field [0001] The patent of the present invention relates to a fingerprint image collection device. In particular, it relates to a high-definition infrared fingerprint collector. Background technique [0002] At present, the most commonly used fingerprint collector is composed of a triangular prism, a light source, a lens, a photoelectric detector, and a rectangular molded pipe frame that shields the ambient light and supports the above components. The middle section of the rectangular tube frame is a lens tube with a built-in lens, and the lower end of the rectangular tube frame is a detector seat equipped with photoelectric detection. The long side of the triangular prism is coated with silicone fingerprint enhancement film as the fingerprint collection surface, and there are two holes beside the rectangular tube frame assembly lens seat, one hole is the lens focal length adjustment hole, and the other is the lens tube seat fixing screw hole . The inventors hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/00G02B7/00G02B1/10G02B7/02G02B7/182G02B17/08G03B30/00
Inventor 车全钟车全宏
Owner DONGGUAN ZKTECO ELECTRONICS TECH
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