CN102486825A - Fingerprint image acquisition apparatus - Google Patents
Fingerprint image acquisition apparatus Download PDFInfo
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- CN102486825A CN102486825A CN2010105745686A CN201010574568A CN102486825A CN 102486825 A CN102486825 A CN 102486825A CN 2010105745686 A CN2010105745686 A CN 2010105745686A CN 201010574568 A CN201010574568 A CN 201010574568A CN 102486825 A CN102486825 A CN 102486825A
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- fingerprint image
- reflecting surface
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- image capture
- prism
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Abstract
The invention provides a fingerprint image acquisition apparatus used for acquiring a fingerprint image. The fingerprint image acquisition apparatus comprises a light source, an image sensor and a prism. The light source is used for emitting a light beam. The image sensor is used for generating the fingerprint image. The prism is used for receiving the light beam emitted by the light source and reflecting the light beam to the image sensor. The prism comprises a finger contact surface used for placing a finger of a user and reflecting the light beam of the light source, a first reflecting surface which is connected with the finger contact surface and forms an included angle alpha with the finger contact surface, and a second reflecting surface which is connected with the finger contact surface and forms an included angle beta with the finger contact surface, wherein, the first reflecting surface reflects a light beam from the finger contact surface to the second reflecting surface, and the second reflecting surface reflects all light beams from the first reflecting surface to the image sensor.
Description
Technical field
The present invention relates to a kind of fingerprint image capture unit, relate in particular to the fingerprint image capture unit that utilizes a nonparallel prism and collocation wide angle lens group.
Background technology
The fingerprint image capture unit can be divided into optical form and non-optical form.At present most fingerprint image capture unit is to adopt optical form, use as the one of which prism (Prism), convex lens (Convex Lens) and image sensor as primary clustering to catch the fingerprint image.
Fig. 1 is a kind of synoptic diagram of conventional fingerprint image capture unit 1.Consult Fig. 1, get into prism 14 via one side of prism 14 from the light beam of light source 12.Light beam advances towards the hypotenuse that contacts with finger 10 in prism 14, and is reflexed to the another side of prism 14 by the image of finger 10.Light beam planoconvex lens 16 again focuses on the image sensor 18, then carries out suitable signal again and handles to accomplish the action of identification of fingerprint.Similar fingerprint image capture unit also can be consulted European patent EP 2039292A1.
In order to reduce the volume of fingerprint image capture unit, U.S. Pat 6826000B2 discloses a kind of shape that changes prism of utilizing, and makes the volume of fingerprint image capture unit be able to dwindle.But the area of the finger surface of contact of this kind fingerprint image capture unit is excessive, and except the zone that finger is placed, still unnecessary many zones cause the volume of fingerprint image capture unit excessive.Moreover light source and lens and image sensor are positioned at not homonymy, and side space can't utilize under the fully reflecting surface of prism, and this also is the principal element that causes fingerprint image capture unit volume to dwindle.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a subminiature fingerprint image capture unit.
Another object of the present invention is to provide the wide angle lens group of arranging in pairs or groups with above-mentioned microminiature fingerprint image capture unit.
The present invention provides a kind of fingerprint image capture unit, is used to obtain the fingerprint image, comprises: a light source is used to launch light beam; One image sensor is used to produce said fingerprint image; And a prism, be used to receive the light beam of said light emitted and with this beam reflection to said image sensor, comprise: abutment face on the other hand is used to supply user's finger to place and with the beam reflection of said light emitted; One first reflecting surface, be connected with said finger surface of contact and the two between have an angle; And one second reflecting surface; Be connected with said finger surface of contact and the two between have an angle β; Wherein, Said first reflecting surface is light beam to said second reflecting surface that reflects from said finger surface of contact, and said second reflecting surface is whole light beams to the said image sensor that reflects from said first reflecting surface.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the area approximation of said finger surface of contact or equal the size of said user's fingerprint.
Further, the angle of said finger surface of contact and said first reflecting surface is between 23 °～27 °.
Further, the angle β of said finger surface of contact and said second reflecting surface is between 158 °～162 °.
Further, said prism also comprises a fourth face, is connected with said first reflecting surface and second reflecting surface, and the light beam of said light emitted is to pass said fourth face and get into said prism.
Further, the light beam of said light emitted is to penetrate said first reflecting surface and get into said prism.
Further, said fingerprint identifier also comprises a lens combination, is used to receive the said second reflecting surface beam reflected, and said light beam is focused on said image sensor.
Further, said lens combination is a wide-angle lens, be used to receive all from said second reflecting surface light beam.
Further, said lens combination comprises at least two lens, and first lens are negative Qu Guangdu, and second lens are positive Qu Guangdu.
Further, said prism is that glass or plastic material are processed.
Fingerprint image capture unit of the present invention utilizes said structure, can effectively dwindle the volume of fingerprint image capture unit, and the fingerprint image capture unit is applied on the electronic product devices such as mobile phone, camera.
Description of drawings
Fig. 1 is a kind of synoptic diagram of conventional fingerprint image capture unit;
Fig. 2 is the structural drawing of an embodiment of fingerprint image capture unit of the present invention;
Fig. 3 is the synoptic diagram of another embodiment of fingerprint image capture unit light source placement location of the present invention;
In the accompanying drawing, the parts of each label representative are following:
The α angle, β angle, 1,2 fingerprint image capture units, 10 fingers, 22 light sources; 14 prisms, 16 convex lens, 18 CISs, 22 light sources, 24 prisms; 241 finger surface of contact, 242 first reflectings surface, 243 second reflectings surface, 244 fourth faces; 26 lens combination, 261 first lens, 262 second lens, 28 image sensors.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Fig. 2 is the structural drawing of an embodiment of fingerprint image capture unit 2 of the present invention.
Consult Fig. 2, fingerprint image capture unit 2 comprises a light source 22, prism 24, lens combination 26 and with an image sensor 28.Present embodiment fingerprint image capture unit 2 is to see through light source 22 to launch a scattered light light beam; After light beam gets into prism 24; Be projeced into the crestal line (ridge) and the valley line (valley) that are positioned over the finger print on the prism 24; Light beam gets into lens combination 26 and focuses on image sensor 28 after prism 24 internal reflections, form a fingerprint image.
Prism 24 comprises a finger surface of contact 241, one first reflecting surface 242, second reflecting surface 243 and a fourth face 244.The purpose that prism 24 is provided with is the light path for folding light source 22 so that the volume-diminished of fingerprint image capture unit 2, wherein when the light path folding the more time, then fingerprint image capture unit 2 can make thinner.Prism 24 can be glass or plastic material is processed.
Finger surface of contact 241 usefulness are placed for a user's a finger and will be from the beam reflection of light source 22.
First reflecting surface 242 is connected with finger surface of contact 241, and the two accompanies an angle.Angle preferably is 25 ° between 23 °～27 °.First reflecting surface 242 is in order to reflect from the light beam of pointing surface of contact 241.
Second reflecting surface 243 is connected with finger surface of contact 241 and the two accompanies an angle β.Angle β preferably is 160 ° between 158 °～162 °.Second reflecting surface 242 is in order to reflect light beam to the image sensor 28 from first reflecting surface 242.
Wherein, First reflecting surface 241 makes the beam reflection from finger surface of contact 241 surpass finger surface of contact 241 because of angle; And get into second reflecting surface 243, and second reflecting surface 243 makes from first reflecting surface, 242 beam reflected because of angle β and all gets into image sensor 28.
Moreover the area of the finger surface of contact 241 of the fingerprint image capture unit 2 of present embodiment is approximate or equals the size of user's finger print.So, fingerprint image capture unit 2 volumes are reduced.
The lens combination 26 of the fingerprint image capture unit 2 of present embodiment is to be arranged between the fourth face 244 and image sensor 28 of prism 24, and it is the selectivity setting.Lens combination 26 is used to receive all light beams from 243 reflections of second reflecting surface, and this light beam is focused on image sensor 28.This lens combination 26 can be wide-angle lens, is used to receive all light beams from second reflecting surface 243.
Moreover this lens combination 26 can comprise that two lens are respectively first lens 261, second lens, 262, the first lens 261 are negative Qu Guangdu, and second lens 262 are positive Qu Guangdu.The quantity of lens combination 26 is not exceeded with two, as long as can focus on light beam from second reflecting surface 243 in image sensor 28.
The form and the function of light source 22, lens combination 26 and image sensor 28 are identical with existing fingerprint image capture unit, do not specify at this.
Fig. 3 is the synoptic diagram of another embodiment of fingerprint image capture unit 2 light sources 22 placement locations of the present invention.
Consult Fig. 3, the position that light source 22 is provided with also can be arranged on first reflecting surface, 242 outsides of prism 24 except being arranged on prism 24 fourth faces 244 outsides.When light source 22 was arranged on prism 24 fourth faces 244 outsides, light source 22 emitted light beams were to pass fourth face 244 and get in the prism 24.At this moment, a part utilization can be filled in the space in first reflecting surface, 242 outsides of prism 24, can effectively dwindle the volume of fingerprint image capture unit 2.In addition, when light source 22 was arranged on first reflecting surface, 242 outsides of prism 24, light source 22 emitted light beams were to penetrate first reflecting surface 242 and get in the prism 24.At this moment, the space in fourth face 244 outsides of prism 24 can be filled a part utilization equally, also can imitate the volume that dwindles fingerprint image capture unit 2.
Fingerprint image capture unit of the present invention utilizes said structure, can effectively dwindle the volume of fingerprint image capture unit, and the fingerprint image capture unit is applied on the electronic product devices such as mobile phone, camera.
The above is merely illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the accompanying claim its equivalent modifications of carrying out or change.
Claims (10)
1. a fingerprint image capture unit is used to obtain the fingerprint image, it is characterized in that, comprises:
One light source is used to launch light beam;
One image sensor is used to produce said fingerprint image; And
One prism is used to receive the light beam of said light emitted and this beam reflection is arrived said image sensor, comprises:
Abutment face on the other hand is used to supply user's finger to place and with the beam reflection of said light emitted;
One first reflecting surface, be connected with said finger surface of contact and the two between have an angle; And
One second reflecting surface, be connected with said finger surface of contact and the two between have an angle β,
Wherein, said first reflecting surface is light beam to said second reflecting surface that reflects from said finger surface of contact, and said second reflecting surface is whole light beams to the said image sensor that reflects from said first reflecting surface.
2. fingerprint image capture unit according to claim 1 is characterized in that, the area approximation of said finger surface of contact or equal the size of said user's fingerprint.
3. fingerprint image capture unit according to claim 1 is characterized in that, the angle of said finger surface of contact and said first reflecting surface is between 23 °～27 °.
4. fingerprint image capture unit according to claim 1 is characterized in that, the angle β of said finger surface of contact and said second reflecting surface is between 158 °～162 °.
5. fingerprint image capture unit according to claim 1 is characterized in that said prism also comprises a fourth face, is connected with said first reflecting surface and second reflecting surface, and the light beam of said light emitted is to pass said fourth face and get into said prism.
6. fingerprint image capture unit according to claim 1 is characterized in that, the light beam of said light emitted is to penetrate said first reflecting surface and get into said prism.
7. fingerprint image capture unit according to claim 1 is characterized in that said fingerprint identifier also comprises a lens combination, is used to receive the said second reflecting surface beam reflected, and said light beam is focused on said image sensor.
8. fingerprint image capture unit according to claim 7 is characterized in that said lens combination is a wide-angle lens, be used to receive all from said second reflecting surface light beam.
9. fingerprint image capture unit according to claim 7 is characterized in that said lens combination comprises at least two lens, and said lens combination comprises first lens and second lens, and said first lens are negative Qu Guangdu, and said second lens are positive Qu Guangdu.
10. fingerprint image capture unit according to claim 1 is characterized in that, said prism is that glass or plastic material are processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105745686A CN102486825A (en) | 2010-12-06 | 2010-12-06 | Fingerprint image acquisition apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105745686A CN102486825A (en) | 2010-12-06 | 2010-12-06 | Fingerprint image acquisition apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN102486825A true CN102486825A (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105745686A Pending CN102486825A (en) | 2010-12-06 | 2010-12-06 | Fingerprint image acquisition apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105279505A (en) * | 2014-05-28 | 2016-01-27 | 培新科技股份有限公司 | Fingerprint image capturing device and fingerprint image capturing module thereof |
| CN107516089A (en) * | 2017-09-08 | 2017-12-26 | 北京眼神科技有限公司 | A kind of fingerprint acquisition device |
| CN109196519A (en) * | 2018-08-21 | 2019-01-11 | 深圳市汇顶科技股份有限公司 | Lens system, fingerprint identification device and terminal device |
| CN109564338A (en) * | 2018-11-08 | 2019-04-02 | 深圳市汇顶科技股份有限公司 | Lens group, fingerprint identification device and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030053228A1 (en) * | 2001-09-17 | 2003-03-20 | Lee Jong Ik | Optical fingerprint acquisition apparatus |
| CN2746411Y (en) * | 2004-10-29 | 2005-12-14 | 一品国际科技股份有限公司 | Optical engine structure of fingerprint identifier |
| EP2039292A1 (en) * | 2006-07-10 | 2009-03-25 | Pavel Anatolievich Zaitsev | Fingerprint recording device |
| CN201886496U (en) * | 2010-12-06 | 2011-06-29 | 一品国际科技股份有限公司 | Fingerprint image capturing device |
-
2010
- 2010-12-06 CN CN2010105745686A patent/CN102486825A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030053228A1 (en) * | 2001-09-17 | 2003-03-20 | Lee Jong Ik | Optical fingerprint acquisition apparatus |
| CN2746411Y (en) * | 2004-10-29 | 2005-12-14 | 一品国际科技股份有限公司 | Optical engine structure of fingerprint identifier |
| EP2039292A1 (en) * | 2006-07-10 | 2009-03-25 | Pavel Anatolievich Zaitsev | Fingerprint recording device |
| CN201886496U (en) * | 2010-12-06 | 2011-06-29 | 一品国际科技股份有限公司 | Fingerprint image capturing device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105279505A (en) * | 2014-05-28 | 2016-01-27 | 培新科技股份有限公司 | Fingerprint image capturing device and fingerprint image capturing module thereof |
| CN107516089A (en) * | 2017-09-08 | 2017-12-26 | 北京眼神科技有限公司 | A kind of fingerprint acquisition device |
| CN109196519A (en) * | 2018-08-21 | 2019-01-11 | 深圳市汇顶科技股份有限公司 | Lens system, fingerprint identification device and terminal device |
| WO2020037510A1 (en) * | 2018-08-21 | 2020-02-27 | 深圳市汇顶科技股份有限公司 | Lens system, fingerprint recognition apparatus, and terminal device |
| US11366290B2 (en) | 2018-08-21 | 2022-06-21 | Shenzhen GOODIX Technology Co., Ltd. | Lens system, fingerprint identification apparatus and terminal device |
| CN109564338A (en) * | 2018-11-08 | 2019-04-02 | 深圳市汇顶科技股份有限公司 | Lens group, fingerprint identification device and electronic equipment |
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Application publication date: 20120606 |