CN2434688Y - Wholly reflecting living fingerprint collecting instrument - Google Patents
Wholly reflecting living fingerprint collecting instrument Download PDFInfo
- Publication number
- CN2434688Y CN2434688Y CN 00235644 CN00235644U CN2434688Y CN 2434688 Y CN2434688 Y CN 2434688Y CN 00235644 CN00235644 CN 00235644 CN 00235644 U CN00235644 U CN 00235644U CN 2434688 Y CN2434688 Y CN 2434688Y
- Authority
- CN
- China
- Prior art keywords
- prism
- lens
- total reflection
- collecting instrument
- fingerprint collecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Image Input (AREA)
Abstract
The utility model relates to a wholly reflecting lens type living fingerprint collecting instrument, which comprises a light source, a prism, a plane reflector, an objective lens group, a CCD device and a casing. The prism and a front group of objective lens of the utility model are combined into a whole; that is to say, a light emergent surface of the prism becomes a convex arc surface to form the wholly reflecting lens. The front group of objective lens and a holder are removed, and dimensions of the whole fingerprint collecting instrument are reduced; simultaneously, the utility model is simple to machine and assemble. The utility model has wide applying prospects in computer safety and fingerprint door-guard systems.
Description
The utility model belongs to fingerprint identifying optical system.
Live Fingerprint Collecting Instrument is the front-end collection input instrument of fingerprint recognition system, its optical system is made up of right-angle prism and image-forming objective lens basically, group object lens and back group object lens before the image-forming objective lens group is divided into again, the inclined-plane of right-angle prism is the fingerprint input window, when the finger stamp is to the prism inclined-plane, according to the principle of optical total-reflection, can on the outlet direction of light, observe apparent in view fingerprint image.Though image has certain distortion, this distortion is identical everywhere in whole visual field, be easy to correct by computing machine, and optical system is simple, so a lot of fingerprint acquisition instrument all adopts this optical system, uses very extensive.Yet, because preceding group of aperture of objective lens of this optical system is bigger, directly influencing the overall dimensions of fingerprint acquisition instrument, this just seems very inconvenient concerning the fingerprint recognition system of miniaturization, also inharmonious on the profile.
The purpose of this utility model is to provide the total reflection lens formula live Fingerprint Collecting Instrument that a kind of optical system is comparatively simple, volume is little.
The purpose of this utility model realizes by technical scheme shown in the drawings, it comprises light source, prism, plane mirror, objective lens, ccd video camera and housing, the utility model is integrated prism and preceding group of object lens, the beam projecting face that is prism becomes a convex globoidal, forms total reflection lens.Total reflection lens can be an one by a prism and monolithic plano-convex lens gummed, also can directly be worn into or by plastic injection-moulded in aggregates by optical glass.Total reflection lens promptly plays a part to form fingerprint image, plays a part the preceding objective lens of telecentric beam path again and afterwards organize objective lens to form telecentric beam path together.
The utility model is integrated preceding group of object lens and prism, has removed preceding group of object lens and support, has significantly reduced the physical dimension of whole fingerprint acquisition instrument, and simultaneously, process and assemble is simple.The utility model has wide practical use in computer security, fingerprint entrance guard system.
Accompanying drawing 1 is the utility model light path principle figure;
Accompanying drawing 2 is the utility model structural representation.
Legend: 1, light source; 2, prism; 3, ccd video camera; 4, objective lens; 5, plane mirror; 6, housing.
Embodiment
As shown in Figure 2, the input area of prism is 20 * 20 millimeters, 10 millimeters of prism triangle form heights, at exiting surface gummed a slice monolithic plano-convex lens of prism, the radius of convex lens is 60 millimeters, and peripheral shape is identical with the prism exiting surface, plane mirror in the housing becomes 15 ° of angles with surface level, objective lens connects 1/3 at the rear portion of housing after the objective lens " ccd video camera, light source are area source.The present embodiment overall size is long 55 millimeters, and wide and height is 25 millimeters.
During work, the reflecting surface of light illumination total reflection lens is when the finger stamp arrives this reflecting surface, according to total reflection principle, exit direction at light forms fingerprint image clearly, and this image is imaged onto on the ccd video camera target surface after penetrating mirror and objective lens through total reflection lens, plane.Image is sent into computing machine after the analog to digital conversion of the opto-electronic conversion of ccd video camera and image card, finish image acquisition work.
Claims (3)
1, total reflection lens formula live Fingerprint Collecting Instrument, comprise light source, rib, plane mirror, objective lens, ccd video camera and housing, it is characterized in that prism and preceding group of object lens are integrated, promptly the beam projecting face of prism becomes a convex globoidal, forms total reflection lens.
2,, it is characterized in that total reflection lens is an one by a prism and a monolithic plano-convex lens gummed according to the said total reflection lens formula of claim 1 live Fingerprint Collecting Instrument.
3,, it is characterized in that total reflection lens is directly worn into by optical glass or by plastic injection-moulded in aggregates according to the said total reflection lens formula of claim 1 live Fingerprint Collecting Instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00235644 CN2434688Y (en) | 2000-06-27 | 2000-06-27 | Wholly reflecting living fingerprint collecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00235644 CN2434688Y (en) | 2000-06-27 | 2000-06-27 | Wholly reflecting living fingerprint collecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2434688Y true CN2434688Y (en) | 2001-06-13 |
Family
ID=33597376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00235644 Expired - Fee Related CN2434688Y (en) | 2000-06-27 | 2000-06-27 | Wholly reflecting living fingerprint collecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2434688Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103955686A (en) * | 2014-05-15 | 2014-07-30 | 浙江师大计海新技术有限公司 | Palm print collecting instrument |
| CN104239869A (en) * | 2014-09-25 | 2014-12-24 | 武汉华和机电技术有限公司 | Intelligent fingerprint identification device and device |
| CN105816105A (en) * | 2015-01-27 | 2016-08-03 | 德国福维克控股公司 | Automatically movable device |
| CN107516089A (en) * | 2017-09-08 | 2017-12-26 | 北京眼神科技有限公司 | A kind of fingerprint acquisition device |
-
2000
- 2000-06-27 CN CN 00235644 patent/CN2434688Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103955686A (en) * | 2014-05-15 | 2014-07-30 | 浙江师大计海新技术有限公司 | Palm print collecting instrument |
| CN104239869A (en) * | 2014-09-25 | 2014-12-24 | 武汉华和机电技术有限公司 | Intelligent fingerprint identification device and device |
| CN104239869B (en) * | 2014-09-25 | 2018-03-16 | 武汉华和机电技术有限公司 | A kind of intelligent fingerprint identification device and method |
| CN105816105A (en) * | 2015-01-27 | 2016-08-03 | 德国福维克控股公司 | Automatically movable device |
| CN107516089A (en) * | 2017-09-08 | 2017-12-26 | 北京眼神科技有限公司 | A kind of fingerprint acquisition device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |