CN201477613U

CN201477613U - Small-sized single-reflecting fingerprint scanner

Info

Publication number: CN201477613U
Application number: CN2009203050577U
Authority: CN
Inventors: 翁德荣
Original assignee: Green Bit Tianjin Biometric Systems Co Ltd
Current assignee: Green Bit Tianjin Biometric Systems Co Ltd
Priority date: 2009-06-25
Filing date: 2009-06-25
Publication date: 2010-05-19
Anticipated expiration: 2019-06-25

Abstract

The utility model relates to a small-sized fingerprint scanner reflecting once, and aims to provide a small-sized single-reflecting fingerprint scanner which is simple in structure and small in integral volume and can obtain data via single reflecting. A refractor utilizes a prism, a diffuser is adhered on an incidence plane of the prism, a reflecting surface of the prism is utilized as a scanning surface while the other surface of the prism is correspondingly provided with a lens, the only reflector reflects light, and the light directly enters a receiving device, the receiving device comprises an objective lens device and an image sensor, and the objective lens device faces a reflecting surface of the reflector. Single reflection can save the required reflector and can also simplify arrangement of the reflector, and then the integral volume can be reduced and the inside structure of the fingerprint scanner is simplified.

Description

Single reflection small fingerprint Acquisition Instrument

Technical field

The utility model relates to a kind of fingerprint acquisition instrument, especially a kind of small-sized only reflection fingerprint acquisition instrument once.

Background technology

For accurately characterizing a people's identity, need to gather individual feature, existing acquisition mode: fingerprint, palmmprint, face line, iris, sound, vein, signature sometimes.

Fingerprint is one of natural miracle, and therefore human had I.D. built-in, that obtain easily just, and everyone finger tip all has a unique design of only representing the himself.

The fingerprint collecting instrument system has two groundworks: the one, and the image that needs acquisition to point, the 2nd, need to determine ridge line in this image and trough whether with former images acquired in ridge line and trough match, the fingerprint image that obtains a people has several different methods, the most frequently used method is exactly optical module collection and semiconductor collection now, these two kinds of acquisition methods are worked in a completely different way, but all can obtain with a kind of image.

The core component of optical module collection is an imageing sensor, this with digital camera and video camera in the light sensor system that uses be identical.CCD (charge-coupled image sensor) is as an imageing sensor, and this device can produce electric signal under the effect of photon, pixel of each image recording sensor, i.e. and the small round dot of the light beam of this point is hit in representative.The light and shade pixel has constituted the image of collection scene (for example finger) jointly.Usually, an analog to digital converter is arranged in the Acquisition Instrument system, be used for the treatment of simulated electronic signal to produce the digital representation of this image.Acquisition Instrument is furnished with light source, is generally one group of light emitting diode, is used for illuminating the ridge line of finger.When you were placed on finger on the Collection prism, gatherer process had just begun, and the CCD camera just is filmed fingerprint.What in fact the CCD system produced is the inverted image of finger, the more reflection ray of darker Regional Representative (the ridge line of finger), the reflection ray (trough of finger) that brighter Regional Representative is less.Before comparing fingerprint and storing data, the Acquisition Instrument processor will guarantee that CCD has photographed distinct image.It can check the integral value of the mean value or a small sample of pixel darkness, if integral image is too dark or too bright, just this time collection can be abandoned.So Acquisition Instrument is adjusted acquisition time and is entered to allow light more or still less, gathers once again.If darkness is suitable, the Acquisition Instrument system can continue the sharpness (acutance of fingerprint collecting) of check image.Processor will be checked the some straight lines that move along the vertical and horizontal directions on image.If the line vertical with the ridge line is made of alternately very dark pixel and very bright pixel, so just mean that fingerprint image has good sharpness.Find under the clear picture and the correct situation of exposing that at processor it can continue the fingerprint of will catch and the fingerprint on the file compares.

As the optical module Acquisition Instrument, the semiconductor Acquisition Instrument produces ridge line and the trough image of forming fingerprint.Difference is that the semiconductor Acquisition Instrument uses electric current but not light comes the sensing fingerprint.

Summary of the invention

The purpose of this utility model provides a kind of simple in structure, and overall volume is little, obtains single reflection small fingerprint Acquisition Instrument of data through primary event.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of single reflection small fingerprint Acquisition Instrument, comprise housing, light source, refracting telescope, catoptron and receiving trap, wherein, refracting telescope adopts prism, be covered with diffusing globe on the plane of incidence of prism, the reflecting surface of prism is as collection face, and another face correspondence of prism is placed with lens, and described catoptron directly enters into receiving trap after having only a mirror reflects light; Described receiving trap comprises objective apparatus and imageing sensor, and objective apparatus is facing to the reflecting surface of catoptron.The effect of objective apparatus is that sample is done to amplify for the first time, it is the important components of decision Acquisition Instrument readability, objective apparatus utilizes light to make the imaging for the first time of tested object, thereby direct relation and influence quality and every optical technology parameter of imaging, imageing sensor is the photoelectric converting function that utilizes photoelectric device, light image on its light-sensitive surface converted to light image become corresponding proportion to concern a kind of function element of electric image signal, be divided into CCD and CMOS (ComplementaryMetal-Oxide Semiconductor according to the element difference, metal oxide semiconductor device), CCD is the high-end technology element that is applied in the imaging aspect, CMOS then is applied in the product of low image quality, its advantage is that manufacturing cost is lower than CCD, power consumption is also much lower, although bigger difference is arranged technically, but CCD and CMOS performance gap are not very big, just the CMOS camera is higher to the requirement of light source, but this problem is resolved substantially now, the CCD size of component mostly is 1/3 inch or 1/4 inch at present, under identical resolution, should select component size bigger for well; Catoptron in the technical program and prism constitute the light path reflection paths, collect the fingerprint signal of electric signal by objective apparatus as receiving trap at last, thereby dwindle the overall volume of Acquisition Instrument, and inner is relatively simple for structure.

As preferably, objective apparatus is fixed on the Acquisition Instrument housing, and imageing sensor is fixed on the sensor board, and imageing sensor is facing to the light path of objective apparatus inside.Imageing sensor to external data processor, is stored data transmission or the data of data with original storage are compared by external data processor.

As preferably, light source adopts luminous plaque.Luminous plaque can provide Acquisition Instrument to use for a long time as the light source that continues.

The beneficial effects of the utility model are: individual reflection can be saved the catoptron that needs, and also can simplify the layout of catoptron, can reduce whole volume like this, simplifies the structure of Acquisition Instrument inside.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model;

Among the figure: 1, luminous plaque, 2, diffusing globe, 3, prism, 4, lens, 5, catoptron, 6, objective apparatus, 7, imageing sensor, 8, sensor board.

Embodiment

Below by specific embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment: a kind of single reflection small fingerprint Acquisition Instrument (referring to accompanying drawing 1), comprise light source, refracting telescope, catoptron and receiving device, adopt luminous plaque 1 as light source, adopt prism 3 as refracting telescope, prism is the plane of incidence towards the one side of luminous plaque, be covered with diffusing globe 2 on the plane of incidence, second face of prism is as collection face, the light of luminous plaque enters through three face of collection face reflection through prism from the plane of incidence of prism, the position lens 4 of the 3rd face of corresponding prism, receiving trap comprises objective apparatus 6 and imageing sensor 7, objective apparatus is fixed on the Acquisition Instrument housing, imageing sensor is fixed on the sensor board 8, and imageing sensor is facing to the light path of objective apparatus inside.

Single reflection small fingerprint Acquisition Instrument possesses the USB2.0 interface, can be used as the peripherals of a station symbol standard, is connected to any PC fast.

Above-described embodiment is a kind of preferred version of the present utility model, is not the utility model is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.

Claims

1. a list reflects the small fingerprint Acquisition Instrument, comprise housing, light source, refracting telescope, catoptron and receiving trap, it is characterized in that described refracting telescope adopts prism, be covered with diffusing globe on the plane of incidence of prism, the reflecting surface of prism is as collection face, another face correspondence of prism is placed with lens, and described catoptron directly enters into receiving trap after having only a mirror reflects light.

2. single reflection small fingerprint Acquisition Instrument according to claim 1 is characterized in that described receiving trap comprises objective apparatus and imageing sensor, and objective apparatus is facing to the reflecting surface of catoptron.

3. single reflection small fingerprint Acquisition Instrument according to claim 2 is characterized in that objective apparatus is fixed on the Acquisition Instrument housing, and imageing sensor is fixed on the sensor board, and imageing sensor is facing to the light path of objective apparatus inside.

4. according to claim 1 or 2 or 3 described single reflection small fingerprint Acquisition Instruments, it is characterized in that described light source adopts luminous plaque.