CN201556215U - Double-reflection fingerprint acquisition instrument - Google Patents
Double-reflection fingerprint acquisition instrument Download PDFInfo
- Publication number
- CN201556215U CN201556215U CN2009203050609U CN200920305060U CN201556215U CN 201556215 U CN201556215 U CN 201556215U CN 2009203050609 U CN2009203050609 U CN 2009203050609U CN 200920305060 U CN200920305060 U CN 200920305060U CN 201556215 U CN201556215 U CN 201556215U
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- acquisition instrument
- prism
- catoptron
- light path
- fingerprint acquisition
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Abstract
The utility model relates to a fingerprint acquisition instrument through double reflection of the optical signal and aims to provide a novel double-reflection fingerprint acquisition instrument which has simple structure and small size and comprises a light source, a refractor, reflectors and a receiving device, wherein the refractor adopts a prism; the incident plane of the prism is coated with a diffuser; the reflecting surface of the prism is used as an acquisition surface; a lens is correspondingly arranged on the other surface of the prism; a first reflector and a second reflector are sequentially arranged on a light path of the acquisition instrument; the receiving device is arranged on a reflecting light path of the second reflector; a light path formed by the first reflector and the second reflector is closed; the receiving device comprises an objective lens device and an image sensor arranged at the back of the objective lens device; and the objective lens device is fixed on an acquisition instrument shell. After double reflection of the two reflectors, the light image refracted from the lens enters the receiving device to form the closed light path, therefore the structure of the acquisition instrument is more compact and the size is decreased.
Description
Technical field
The utility model relates to a kind of fingerprint acquisition instrument, and especially a kind of light signal is through the fingerprint acquisition instrument of bireflection.
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 novel bireflection fingerprint acquisition instrument, and relatively simple for structure, volume ratio is less.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of bireflection fingerprint acquisition instrument, comprise light source, refracting telescope, catoptron and receiving trap, wherein, 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, be placed with first catoptron and second catoptron on the light path of Acquisition Instrument successively, receiving trap is placed on the reflected light path of second catoptron, and the light path that first catoptron and second catoptron constitute is closed; Receiving trap comprises objective apparatus and is arranged on the imageing sensor of objective apparatus back that objective apparatus is fixed on the Acquisition Instrument housing.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; First catoptron in the technical program and second catoptron and prism constitute the light path reflection paths of a sealing, collect the fingerprint signal of electric signal at last as receiving trap by objective apparatus, thereby dwindle the overall volume of Acquisition Instrument, inner is relatively simple for structure; 1 acquisition window supports 4 to refer to the flat scanning of flat scanning, 2 thumbs side by side, and the rolling finger scan, and volume is little, in light weight, be easy to carry, but both independent utility also can be integrated among other solutions.
As preferably, the imageing sensor back is provided with sensor board, and imageing sensor is fixed on the sensor board.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: adopt two secondary mirror to go into to form the light path path of sealing to receiving trap through two secondary reflections are laggard from the light image that comes from the lens refraction, make that the structure of Acquisition Instrument is compact more, volume-diminished.
Description of drawings
Fig. 1 is a kind of structural representation of the utility model;
Among the figure: 1, prism, 2, diffusing globe, 3, luminous plaque, 4, first catoptron, 5, second catoptron, 6, objective apparatus, 7, sensor board, 8, imageing sensor, 9, lens.
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 bireflection fingerprint acquisition instrument (referring to accompanying drawing 1), comprise light source, refracting telescope, catoptron and receiving device, adopt luminous plaque 3 as light source, adopt prism 1 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 9 of the 3rd face of corresponding prism, be placed with first catoptron 5 and second catoptron 4 on the light path of Acquisition Instrument successively, receiving trap is placed on the second radioscopic reflected light path, the light path that first catoptron and second catoptron constitute is closed, the incident ray of first catoptron and the angle between the reflection ray are acute angle, receiving trap comprises objective apparatus 6 and is arranged on the imageing sensor 8 of objective apparatus back, objective apparatus is fixed on the Acquisition Instrument housing, the imageing sensor back is provided with sensor board 7, and imageing sensor is fixed on the sensor board.
The multiple reflection 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 (4)
1. bireflection fingerprint acquisition instrument, comprise 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 scanning plane, and another face correspondence of prism is placed with lens, is placed with first catoptron and second catoptron on the light path of Acquisition Instrument successively, receiving trap is placed on the second radioscopic reflected light path, and the light path that first catoptron and second catoptron constitute is closed.
2. bireflection fingerprint acquisition instrument according to claim 1 is characterized in that described receiving trap comprises objective apparatus and the imageing sensor that is arranged on the objective apparatus back, and objective apparatus is fixed on the Acquisition Instrument housing.
3. bireflection fingerprint acquisition instrument according to claim 2 is characterized in that the imageing sensor back is provided with sensor board, and imageing sensor is fixed on the sensor board.
4. bireflection fingerprint acquisition instrument according to claim 1 is characterized in that described light source adopts luminous plaque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203050609U CN201556215U (en) | 2009-06-25 | 2009-06-25 | Double-reflection fingerprint acquisition instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203050609U CN201556215U (en) | 2009-06-25 | 2009-06-25 | Double-reflection fingerprint acquisition instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201556215U true CN201556215U (en) | 2010-08-18 |
Family
ID=42615902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203050609U Expired - Fee Related CN201556215U (en) | 2009-06-25 | 2009-06-25 | Double-reflection fingerprint acquisition instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201556215U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339689A (en) * | 2016-08-31 | 2017-01-18 | 长春鸿达光电子与生物统计识别技术有限公司 | Finger and palm print image collection device |
| CN111967472A (en) * | 2020-09-22 | 2020-11-20 | 深圳市上融科技有限公司 | Double-reflection light path electronic passport collecting instrument |
-
2009
- 2009-06-25 CN CN2009203050609U patent/CN201556215U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339689A (en) * | 2016-08-31 | 2017-01-18 | 长春鸿达光电子与生物统计识别技术有限公司 | Finger and palm print image collection device |
| CN111967472A (en) * | 2020-09-22 | 2020-11-20 | 深圳市上融科技有限公司 | Double-reflection light path electronic passport collecting instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20170625 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |