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Fingerprint image display and collecting device

A fingerprint image and collection device technology, which is applied in the field of fingerprint image display and collection devices, can solve the problems of image aspect ratio distortion, uneven light source illumination, large aberration, etc., and achieve undistorted images and consistent length and width ratios , the effect of small aberration

Inactive Publication Date: 2003-12-03
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method that can improve the imaging quality and make the entire optical path more compact, with the disadvantages of distorted image aspect ratio, uneven illumination of the light source, long optical path and large aberration in the fingerprint collection process of the prior art. More compact and more realistic fingerprint image display and collection device

Method used

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  • Fingerprint image display and collecting device
  • Fingerprint image display and collecting device
  • Fingerprint image display and collecting device

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Embodiment Construction

[0015] Such as figure 2 structure shown. In order to avoid chromatic aberration in the imaging process, the light source 1 illuminates the finger 2 under test with the monochromatic red light (wavelength λ=766nm) emitted by the area array LED 101, and covers the area array LED 101 with a frosted glass sheet 102 , the purpose is to uniformly illuminate the finger 2 under test. The material and size of the right-angle prism 3 and the compensating right-angle prism 7 are exactly the same, and it is better to make an isosceles right-angle total reflection prism, and their slope area is slightly larger than the effective area of ​​the finger print of ordinary people, and the length, width and height are 32cm× 20cm×32cm. The doublet lens 11 is formed by cementing two lenses, one convex and one concave, and they are respectively made of two glass materials with different refractive indices. The greater the difference in refractive index, the better they balance each other out to ...

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Abstract

The present invention relates to a fingerprint display and pick device, including outer shell with window for receiving finger and window for observation, and is characterized by that in the interior of said outer shell and along the forward direction of reflected light of the tested finger the rectangular prism, compensation rectangular prism, plane reflector, double balsaming lens and hyperhemispherical type immersion lens are placed in turn and in same optical axis mode, and connected to the camera element. The light source consisting of planar array light emitting diode and frosted glass plate covering on it is directed toward one rectangular plane of rectangular prism. Its whole optical circuit is compact and reasonable, and possesses the advantages of undistorted image, good quality, high articulation and small aberration.

Description

technical field [0001] The invention relates to a device for displaying and collecting fingerprint images. Background technique [0002] Fingerprint is a characteristic that remains unchanged throughout life. Because of its uniqueness and stability, fingerprint has always been a reliable means of identification and security. Therefore, constructing a device for displaying and collecting fingerprint images has broad application prospects and practical significance. In the prior art, Makoto Igaki, Zhuo Shinzaki, Haoji Benwen and others patented "Optical Fingerprint Detection Mechanism" in Japan (issued by the Japanese Patent Office on September 21, 1993, publication number: JP-P5-242230 ), an optical system structure for fingerprint image display is provided, such as figure 1 shown. The light emitted by the light source 1 enters the rectangular prism 3 from the rectangular surface of the prism 3 at an angle greater than the critical angle. Press the finger 2 to be tested o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 朱鹏飞
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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