CN2473636Y - Optical system of small fingerprint input instrument - Google Patents
Optical system of small fingerprint input instrument Download PDFInfo
- Publication number
- CN2473636Y CN2473636Y CN 01237581 CN01237581U CN2473636Y CN 2473636 Y CN2473636 Y CN 2473636Y CN 01237581 CN01237581 CN 01237581 CN 01237581 U CN01237581 U CN 01237581U CN 2473636 Y CN2473636 Y CN 2473636Y
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- CN
- China
- Prior art keywords
- face
- prism
- optical system
- diaphragm
- fingerprint input
- Prior art date
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- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 238000003384 imaging method Methods 0.000 claims description 19
- 238000005286 illumination Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000000392 somatic effect Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002189 fluorescence spectrum Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Image Input (AREA)
Abstract
The utility model belongs to the technical field of optics, especially, relate to a fingerprint identification system who adopts image space telecentric optics path. The optical system of small-size fingerprint input appearance includes the illumination board, the prism, the camera element, transparent rubber layer, it is first, the two mirrors, the diaphragm, lens, transparent rubber layer pastes on the first face of prism, the illumination board closely leans on the second face of prism, first speculum is in the third face one side of prism, can receive the reverberation of first face, and with light reflection to the second mirror on, light passes through diaphragm to lens, again to camera element, the diaphragm is located the focal plane of lens and perpendicular with the chief ray.
Description
The utility model belongs to optical technical field, relates to the finger-print recognising instrument optical system that adopts telecentric beam path in image space.
Existing technology mainly contains utility model patent 98215867 and 98200646.In existing technology, adopted the object space telecentric beam path and proofreaied and correct prism to realize distortionless fingerprint imaging.Its shortcoming is to use two groups of lens to constitute the object space telecentric beam path, to eliminate distortion, in fact, as long as distortion is controlled at certain scope, simultaneously corrected the effect that does not influence fingerprint recognition at algorithm for recognizing fingerprint, and the size of first lens must be greater than the size of fingerprint collecting face, and the size of its optical system is big, assembly precision requires height, and cost is also higher.
The objective of the invention is to overcome above-mentioned shortcoming provide a kind of small-sized, distortion is less, the assembly precision requirement is low, the optical system of the instrument of small fingerprint input cheaply.
The technical scheme that the utility model adopted is a kind of optical system of small fingerprint input instrument, comprise illuminatian plate, prism, imaging apparatus, it also comprises the transparent rubber layer, first catoptron, second catoptron, diaphragm, lens, the transparent rubber layer sticks on first face of prism, illuminatian plate abuts against on second face of prism, first catoptron is in the 3rd face one side of prism, can receive the reflected light of first face of prism, and light reflexed on second catoptron, light by diaphragm to lens, again to imaging apparatus, diaphragm is positioned on the focal plane of lens and is vertical with chief ray.
The utility model is preferably elected prism as the isosceles right angle prism, first face is the inclined-plane of isosceles right angle prism, second face, the 3rd face are respectively two right angle faces, illuminatian plate be near or stick on second face of prism, adopt light emitting diode (LED) as light source, its frequency is avoided 337nm, 674nm, 1011nm, and first catoptron is α with the angle that the inclined-plane became of prism
1, 90 °≤α
1≤ 95 °, second catoptron is positioned at the below of first catoptron, and with surface level angle α
2Be 5 °-12 °, the hole of diaphragm is a circular port, and the aperture is 0.5-2.0mm, or the hole of diaphragm is rectangular opening, and the length of side is 0.5-2.0mm, and the focal length of lens is 6-20mm, the angle α of imaging apparatus and chief ray
4Be 84 °-86 °, an optical filter is arranged between diaphragm and the lens, it is identical with optical source wavelength that it sees through light wavelength.
The utility model has the advantages that: 1. utilize two catoptrons to increase the distance (being object distance) of fingerprint collecting face and imaging len effectively, thereby reduced the ladder type distortion; 2. diaphragm is placed on the object space focal plane of imaging len, constitute telecentric beam path in image space, reduced the matching requirements of imaging apparatus; 3. at the characteristics of somatic fingerprint fluorescence spectrum, select specific illumination light wavelength, to improve the contrast of finger print image signals collecting.Because the somatic fingerprint face has three fluorescence excitation peaks at 337nm, 674nm, 1011nm place, in the fingerprint recognition system of utilizing the total reflection mode, should avoid these fluorescence peaks in the selection of illumination with luminescent device (using LED usually) to improve the contrast of fingerprint collecting; 4. select the optical filter that is complementary with LED, it sees through light wavelength is the emission wavelength of LED, with the filtering parasitic light, realizes the fingerprint collecting of high-contrast; 5. paste layer of transparent rubber on the surface of prism,, make the fingerprint face use prism will get well much more merely, improved the contrast that finger print image is gathered with contacting of face of sampling because rubber has certain elasticity.
Fig. 1 is the utility model structural representation
Fig. 2 is the utility model schematic diagram
Wherein: the 3rd face of 1 illuminatian plate, 2 prism 22 second faces 23 of 21 first faces 3 transparent rubber layers 4 first catoptron 5 second catoptrons 6 diaphragms 7 filters 8 lens 9 imaging apparatuss
Below in conjunction with view the utility model is described in detail
A kind of as shown in Figure 1 optical system of small fingerprint input instrument, comprise illuminatian plate 1, prism 2, imaging apparatus 9, transparent rubber layer 3, first catoptron 4, second catoptron 5, diaphragm 6, lens 8, prism 2 is the isosceles right angle prism, the inclined-plane that transparent rubber layer 3 sticks on prism 2 is on first face 21, illuminatian plate 1 near or a right angle face sticking on prism 2 promptly on second face 22, first catoptron 4 is the 3rd face 23 1 sides at another right angle face of prism 2, can receive the reflected light of first face 21, and light reflexed on second catoptron 5, light passes through diaphragm 6 to lens 8, again to imaging apparatus 9, diaphragm 6 is positioned on the focal plane of lens 8 and is vertical with chief ray, illuminatian plate 1 is to adopt LED as light source, its frequency is avoided 337nm, 674nm, 1011nm, first catoptron 4 is that the angle that first face 21 is become is α with the inclined-plane of prism 2
1, 90 °≤α
1≤ 95 °, second catoptron 5 is positioned at the below of first catoptron 4, with surface level angle α
2Be 5 °-12 °, angle [alpha]
1And α
2Selection principle be in order to guarantee that last imaging plane roughly is in the centre of instrument, the angle α of chief ray and surface level
3=45 ° of-2 * (α
1+ α
2), the hole of diaphragm 6 or be circular port, the aperture is 0.5-2.0mm, or be rectangular opening, the length of side is 0.5-2.0mm, the focal length of lens 8 is 6-20mm, imaging apparatus 9 can adopt the CMOS picture pick-up device, also can adopt the CCD picture pick-up device, imaging apparatus 9 is 84 °-86 ° with the angle α 4 of chief ray, imaging apparatus is delivered to the picture intelligence that collects in computing machine or other picture intelligence treatment facilities and is handled, and an optical filter 7 is arranged between diaphragm 6 and the lens 8, and it is identical with optical source wavelength that it sees through light wavelength.
Principle of work of the present utility model is a total reflection principle.Fingerprint collecting regards to that optical axis always tilts, and as shown in Figure 2,1-1 is the fingerprint collecting face, and 1-2 is imaging len, and 1-3 is image planes, and the fingerprint face gathers the two ends of face and the distance L of lens
1, L
2Be different, the two ends of fingerprint collecting face have different magnifications when the scioptics imaging like this, cause the ladder type distortion of image planes, also will bring image planes to tilt simultaneously.The size of amount of distortion depends on L
1/ L
2Value, L
1/ L
2Near 1, then distortion is more little more.Because the size of fingerprint collecting face is fixed, increase L
1And L
2To help making L
1/ L
2Approach 1.The present invention utilizes two catoptrons to increase object distance effectively, makes this ratio approach 1, has also reduced the size of fingerprint input instrument simultaneously.
Claims (10)
1, a kind of optical system of small fingerprint input instrument, comprise illuminatian plate (1), prism (2), imaging apparatus (9), it is characterized in that it also comprises transparent rubber layer (3), first catoptron (4), second catoptron (5), diaphragm (6), lens (8), transparent rubber layer (3) sticks on first face (21) of prism (2), illuminatian plate (1) abuts against on second face (22) of prism (2), first catoptron (4) is in the 3rd face (23) one sides of prism (2), can receive the reflected light of first face (21), and light reflexed on second catoptron (5), light passes through diaphragm (6) to lens (8), again to imaging apparatus (9), diaphragm (6) is positioned on the focal plane of lens (8) and is vertical with chief ray.
2, the optical system of small fingerprint input instrument according to claim 1 is characterized in that prism (2) is the isosceles right angle prism, and first face (21) is the inclined-plane, and second face (22), the 3rd face (23) are respectively two right angle faces.
3, the optical system of small fingerprint input instrument according to claim 1 is characterized in that illuminatian plate (1), and as light source, its frequency is avoided 337nm, 674nm, 1011nm with LED.
4, the optical system of small fingerprint input instrument according to claim 1 is characterized in that first catoptron (4) is α with the angle that the inclined-plane became of prism
1, 90 °≤α
1≤ 95 °.
5, the optical system of small fingerprint input instrument according to claim 1 is characterized in that second catoptron (5) is positioned at the below of first catoptron (4), with surface level angle α
2Be 5 °--12 °.
6, the optical system of small fingerprint input instrument according to claim 1, the hole that it is characterized in that diaphragm (6) is a circular port, the aperture is 0.5-2.0mm.
7, the optical system of small fingerprint input instrument according to claim 1, the hole that it is characterized in that diaphragm (6) is a rectangular opening, the length of side is 0.5-2.0mm.
8, the optical system of small fingerprint input instrument according to claim 1, the focal length that it is characterized in that lens (8) is 6-20mm.
9, small fingerprint according to claim 1 is imported the optical system of instrument, it is characterized in that the angle α of imaging apparatus and chief ray
4Be 84--86 °.
10, the optical system of small fingerprint input instrument according to claim 1 is characterized in that between diaphragm (6) and the lens (8) optical filter (7) being arranged, and it is identical with optical source wavelength that it sees through light wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01237581 CN2473636Y (en) | 2001-04-24 | 2001-04-24 | Optical system of small fingerprint input instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01237581 CN2473636Y (en) | 2001-04-24 | 2001-04-24 | Optical system of small fingerprint input instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2473636Y true CN2473636Y (en) | 2002-01-23 |
Family
ID=33650355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01237581 Expired - Fee Related CN2473636Y (en) | 2001-04-24 | 2001-04-24 | Optical system of small fingerprint input instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2473636Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449566C (en) * | 2004-03-29 | 2009-01-07 | 塞库特洛尼克斯株式会社 | Optical finger print input device |
| WO2020172876A1 (en) * | 2019-02-28 | 2020-09-03 | 深圳市汇顶科技股份有限公司 | Optical image collection unit, optical image collection system, and electronic device |
-
2001
- 2001-04-24 CN CN 01237581 patent/CN2473636Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449566C (en) * | 2004-03-29 | 2009-01-07 | 塞库特洛尼克斯株式会社 | Optical finger print input device |
| WO2020172876A1 (en) * | 2019-02-28 | 2020-09-03 | 深圳市汇顶科技股份有限公司 | Optical image collection unit, optical image collection system, and electronic device |
| US11514709B2 (en) | 2019-02-28 | 2022-11-29 | Shenzhen GOODIX Technology Co., Ltd. | Biometric identification device using a light detection apparatus with light blocking layer/diaphragm |
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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 |