CN102360425A - Thinned optical fingerprint acquirer - Google Patents
Thinned optical fingerprint acquirer Download PDFInfo
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- CN102360425A CN102360425A CN2011103220955A CN201110322095A CN102360425A CN 102360425 A CN102360425 A CN 102360425A CN 2011103220955 A CN2011103220955 A CN 2011103220955A CN 201110322095 A CN201110322095 A CN 201110322095A CN 102360425 A CN102360425 A CN 102360425A
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Abstract
The invention provides a thinned optical fingerprint acquirer, which comprises a shell, an acquisition prism, a light source, an imaging device and a circuit board. The thinned optical fingerprint acquirer is characterized in that: the acquisition prism is a right-angled trapezoid prism and comprises a fingerprint acquisition area which is positioned on a section, adjacent to a right-angled waist surface, of an upper bottom surface of the acquisition prism, a first reflecting surface which is positioned on a lower bottom surface, a light incidence surface which is positioned on the section, adjacent to the right-angled waist surface, of the lower bottom surface, a second reflecting surface which is positioned on an inclined waist surface, and a light emergence surface which is positioned on the right-angled waist surface. Optimally, areas, except the fingerprint acquisition area, the first reflecting surface, the second reflecting surface, the light incidence surface and the light emergence surface, on the surface of the acquisition prism are respectively blackened by using black paint. Therefore, external light rays cannot enter the acquisition prism, so that the interference of fingerprint acquisition can be prevented; light rays of an interior light path cannot be refracted on other non-used surfaces, so that the interference of the fingerprint acquisition can be prevented; and the size of products is reduced.
Description
Technical field
The present invention relates to the optical finger print device for picking, relate in particular to the thin optical fingerprint capturer.
Background technology
Optical fingerprint collector is a widely used fingerprint acquisition device in the existing fingerprint recognition system, and it is gathered the finger watch layer texture through optical sensor based on optical imaging concept and forms images.Traditional optical fingerprint capturer volume is bigger, can not be used for the restricted equipment of installing space and use, and for example is not suitable for and installing space limited devices adapteds such as mouse, keyboard, flash disk, mobile phone.Can't adapt to the trend of minimize production in recent years.Simultaneously, because the inherent shortcoming of Collection prism exists ambient light to get into Collection prism, and the interference of refraction to fingerprint collecting take place at the non-use face of Collection prism in a part of internal light, causes the fingerprint collecting image definition lower.In order to improve the sharpness of fingerprint image, traditional way is to adopt outside mode of blocking, and utilizes shell to block in the non-use face of Collection prism, gets in the Collection prism fingerprint collecting is disturbed to reduce extraneous light.Yet, do not solve light interference to fingerprint collecting when refraction takes place the non-use face of Collection prism.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the thin optical fingerprint capturer and comprise shell, Collection prism, light source, imaging device and circuit board, it is characterized in that,
Said Collection prism is the right-angled trapezium prism; Comprise that the upper bottom surface that is positioned at Collection prism is regional near the fingerprint collecting of one section of straight middle surface; Be positioned at first reflecting surface of the bottom surface of Collection prism; Be positioned at the light entrance face of the bottom surface of Collection prism, be positioned at second reflecting surface and the light-emitting face that is positioned at the Collection prism straight middle surface of the oblique girdle plane of Collection prism near one section of straight middle surface;
Said Collection prism surface is except that all using pitch-dark blacking in fingerprint collecting zone, first reflecting surface, second reflecting surface, light entrance face and the zone the light-emitting face;
Said shell is formed by the prism cavity that Collection prism is installed, the perforate integrated setting of the light source cavity of light source being installed and being positioned at the shell afterbody.
The size of said first reflecting surface, make all light of the outgoing from the fingerprint collecting zone receive can be successively through the reflection of first reflecting surface and second reflecting surface from the light-emitting face outgoing.
The size of said light-emitting face, the feasible whole outgoing of the light from first reflecting surface from the reflection of second reflecting surface.
Be coated with reflectance coating on said second reflecting surface.
The geomery of said prism cavity and the geomery of Collection prism are complementary, and after Collection prism was installed in the prism cavity, the light-emitting face of Collection prism was corresponding with said perforate.
Said perforate is used to install imaging device, the shape size of perforate and imaging device coupling, the imaging center position of the center of said light-emitting face, the center of perforate, imaging device and the optical axis coincidence of the second reflecting surface emergent light.
Said imaging device is installed on the circuit board, is made up of lens combination and imaging surface.
Said light source is close to the Collection prism light entrance face that is installed in the prism cavity after being mounted to the light source cavity, and said light source is slim area source, electrically connects with circuit board.
Said circuit board is installed in the shell afterbody, near straight middle surface one side.
The present invention selects for use the right-angled trapezium prism as Collection prism, and light path shines imaging device from exit facet again and forms fingerprint image after in Collection prism, two secondary reflections taking place.Through light path is repeatedly reflected light path folding, become thinner thereby changed light path by collector, satisfy on the market demand to the optical fingerprint collector miniaturization.As optimization, the present invention is also surperficial except that all using pitch-dark blacking in fingerprint collecting zone, first reflecting surface, second reflecting surface, light entrance face and the zone the light-emitting face with Collection prism.Not only can prevent that so extraneous light from getting into the interior interference to fingerprint collecting of Collection prism, can also prevent that the light of inner light path from other non-use faces the interference of refraction to fingerprint collecting taking place.
Description of drawings
Fig. 1 is a stereographic map of the present invention;
Fig. 2 is a scheme of installation of the present invention;
Fig. 3 is the section and the index path of present embodiment;
Fig. 4 is the vertical view of present embodiment Collection prism;
Fig. 5 is the upward view of present embodiment Collection prism;
Fig. 6 is the right figure of present embodiment Collection prism.
Embodiment
The preferred embodiments of the present invention are described with reference to the accompanying drawings, and specific embodiment described herein is only in order to explaining the present invention, and is not used in qualification the present invention.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, the thin optical fingerprint capturer comprises: shell 1, Collection prism 2, light source 3, imaging device 4, circuit board 5.
Shell 1 is by the prism cavity A that Collection prism 1 is installed, and the light source cavity B that light source 3 is installed forms with the perforate C integrated setting that is positioned at shell 1 afterbody.The geomery of prism cavity A and the geomery of Collection prism 2 are complementary, and perforate C is used to install imaging device 4, the shape size of perforate C and imaging device 4 couplings.
Collection prism 2 is the right-angled trapezium prism, comprises fingerprint collecting zone 21, first reflecting surface 22, second reflecting surface 23, light entrance face 24, light-emitting face 25.The size of Collection prism 2 can minimize setting according to user's needs, and the length of the upper bottom surface of Collection prism 1 is 19.90 millimeters in the present embodiment, and the length of bottom surface is 22 millimeters, and the height of straight middle surface is 6 millimeters.The upper bottom surface that fingerprint collecting zone 21 is positioned at Collection prism 2 is near one section of straight middle surface; Be used for pushing when the user carries out fingerprint collecting finger; The length in fingerprint collecting zone 21 can be set according to the size of human finger generally, and the length of fingerprint pickup area 21 is 16 millimeters in the present embodiment.As optimal design, also can fingerprint collecting zone 21 be arranged for ease of guiding and limit the user spill or the boss of finger presses when carrying out fingerprint collecting according to the body mechanics.Zone on the upper bottom surface except that fingerprint collecting zone 21 is with pitch-dark blacking (referring to Fig. 4).Light entrance face 24 is positioned at Collection prism 2 bottom surfaces near one section of straight middle surface.First reflecting surface 22 of fingerprint image is the fully reflecting surface of light, is positioned at the bottom surface of Collection prism 1, and the total reflection function of first reflecting surface can be carried out hacking according to the material of Collection prism 1 and set.The size of first reflecting surface 21 makes all light of outgoing from the fingerprint collecting zone 21 receive to be totally reflected to second reflecting surface 23 through first reflecting surface 22 successively, and by second reflecting surface, 23 reflection backs from light-emitting face 25 outgoing.On Collection prism 2 bottom surfaces except that light entrance face 24 and the zone first reflecting surface 22 with pitch-dark blacking (referring to Fig. 5).Second reflecting surface 23 is a mirror reflection surface, is positioned on the oblique girdle plane of Collection prism 2, is coated with reflectance coating (like the aluminium film) on second reflecting surface 23, is used for the light from 22 outgoing of first reflecting surface is reflexed to light-emitting face 25.Light-emitting face 25 is positioned on the straight middle surface of Collection prism 2, and the size of light-emitting face 25 makes that present embodiment light-emitting face 25 is that radius is 2 millimeters a circle from the whole outgoing of the light from first reflecting surface 22 of second reflecting surface, 23 reflections.Collection prism 2 surface is removed regional 21, first reflecting surface 22 of fingerprint collecting, second reflecting surface 23, light entrance face 24, the zone the light-emitting face 25 and is used pitch-dark blacking; Not only can prevent so extraneous light to fingerprint collecting interference, can also prevent that simultaneously light from other faces of Collection prism 2 interference to fingerprint collecting of refracted ray that the refraction back produced taking place.
Light source 3 is slim area source, and like LGP, EL, OLED area source etc., what present embodiment adopted is the OLED area source, and it is even that the OLED area source has bright dipping, the characteristics of thinner thickness.
Imaging device 4 integrated imaging devices are installed on the circuit board 5, are used for being made up of lens combination and imaging surface according to the photoimaging that receives.Said lens combination is the fix-focus lens module, and said imaging surface is a semiconductor imaging sensor array, and said semiconductor imaging sensor is ccd sensor or cmos sensor, is used for the image formation by rays that lens combination is converged.The photocentre of said lens combination overlaps with the imaging center of imaging surface.
During installation, Collection prism 2 is installed in the prism cavity A of shell 1, and light-emitting face 25 is corresponding with the perforate C of shell 1.Can be employed in local gluing that Collection prism 2 and shell 1 join fixes the two.Circuit board 5 is installed in the afterbody of shell 1 near straight middle surface one side, and passes through screw retention on shell.Light source 3 is installed in the light source cavity B, is close to the light entrance face 24 that is installed in the Collection prism 2 in the prism cavity A, and electrically connects with circuit board 5, and is luminous by circuit board 5 controls.Light source 3 is gluing with the contacted place of shell, to reach fixing purpose.Imaging device 4 is installed on the perforate C of shell 1, and the center of light-emitting face 25, the center of perforate C, the imaging center position of imaging device 4 and the optical axis coincidence of second reflecting surface, 23 emergent lights.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but confirm by the scope of claims.
Claims (9)
1. the thin optical fingerprint capturer comprises shell, Collection prism, light source, imaging device and circuit board, it is characterized in that,
Said Collection prism is the right-angled trapezium prism; Comprise that the upper bottom surface that is positioned at Collection prism is regional near the fingerprint collecting of one section of straight middle surface; Be positioned at first reflecting surface of the bottom surface of Collection prism; Be positioned at the light entrance face of the bottom surface of Collection prism, be positioned at second reflecting surface and the light-emitting face that is positioned at the Collection prism straight middle surface of the oblique girdle plane of Collection prism near one section of straight middle surface;
Said Collection prism surface is except that all using pitch-dark blacking in fingerprint collecting zone, first reflecting surface, second reflecting surface, light entrance face and the zone the light-emitting face;
Said shell is formed by the prism cavity that Collection prism is installed, the perforate integrated setting of the light source cavity of light source being installed and being positioned at the shell afterbody.
2. thin optical fingerprint capturer according to claim 1; It is characterized in that; The size of said first reflecting surface, make all light of the outgoing from the fingerprint collecting zone receive can be successively through the reflection of first reflecting surface and second reflecting surface from the light-emitting face outgoing.
3. thin optical fingerprint capturer according to claim 1 is characterized in that, the size of said light-emitting face, the feasible whole outgoing of the light from first reflecting surface from the reflection of second reflecting surface.
4. according to any described thin optical fingerprint capturer in the claim 1 to 3, it is characterized in that, be coated with reflectance coating on said second reflecting surface.
5. thin optical fingerprint capturer according to claim 1; It is characterized in that; The geomery of said prism cavity and the geomery of Collection prism are complementary, and after Collection prism was installed in the prism cavity, the light-emitting face of Collection prism was corresponding with said perforate.
6. according to claim 1 or 5 described thin optical fingerprint capturers; It is characterized in that; Said perforate is used to install imaging device; The shape size of perforate and imaging device coupling, the imaging center position of the center of said light-emitting face, the center of perforate, imaging device and the optical axis coincidence of the second reflecting surface emergent light.
7. thin optical fingerprint capturer according to claim 6 is characterized in that said imaging device is installed on the circuit board, is made up of lens combination and imaging surface.
8. thin optical fingerprint capturer according to claim 1 is characterized in that, said light source is close to the Collection prism light entrance face that is installed in the prism cavity after being mounted to the light source cavity, and said light source is slim area source, electrically connects with circuit board.
9. thin optical fingerprint capturer according to claim 1 is characterized in that said circuit board is installed in the shell afterbody, near straight middle surface one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103220955A CN102360425A (en) | 2011-10-21 | 2011-10-21 | Thinned optical fingerprint acquirer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103220955A CN102360425A (en) | 2011-10-21 | 2011-10-21 | Thinned optical fingerprint acquirer |
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| CN102360425A true CN102360425A (en) | 2012-02-22 |
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| CN2011103220955A Pending CN102360425A (en) | 2011-10-21 | 2011-10-21 | Thinned optical fingerprint acquirer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632128A (en) * | 2012-08-24 | 2014-03-12 | 成都方程式电子有限公司 | Flat fingerprint gatherer |
| CN103810483A (en) * | 2012-11-02 | 2014-05-21 | 金佶科技股份有限公司 | Fingerprint image capturing system |
| CN107526998A (en) * | 2016-06-21 | 2017-12-29 | 安帝司股份有限公司 | Optical fingerprint sensor and its prism module |
| CN107679440A (en) * | 2016-08-01 | 2018-02-09 | 安帝司股份有限公司 | Thin optical fingerprint sensor |
| CN109145682A (en) * | 2017-06-16 | 2019-01-04 | 固安翌光科技有限公司 | A kind of optical fingerprint identification device and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1555542A (en) * | 2001-09-17 | 2004-12-15 | ������������ʽ���� | Optical fingerprint acquisition apparatus |
| CN101034437A (en) * | 2007-01-12 | 2007-09-12 | 车全宏 | Fingerprint collecting method and high-resolution thin type fingerprint collector |
-
2011
- 2011-10-21 CN CN2011103220955A patent/CN102360425A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1555542A (en) * | 2001-09-17 | 2004-12-15 | ������������ʽ���� | Optical fingerprint acquisition apparatus |
| CN101034437A (en) * | 2007-01-12 | 2007-09-12 | 车全宏 | Fingerprint collecting method and high-resolution thin type fingerprint collector |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632128A (en) * | 2012-08-24 | 2014-03-12 | 成都方程式电子有限公司 | Flat fingerprint gatherer |
| CN103810483A (en) * | 2012-11-02 | 2014-05-21 | 金佶科技股份有限公司 | Fingerprint image capturing system |
| CN107526998A (en) * | 2016-06-21 | 2017-12-29 | 安帝司股份有限公司 | Optical fingerprint sensor and its prism module |
| CN107679440A (en) * | 2016-08-01 | 2018-02-09 | 安帝司股份有限公司 | Thin optical fingerprint sensor |
| CN109145682A (en) * | 2017-06-16 | 2019-01-04 | 固安翌光科技有限公司 | A kind of optical fingerprint identification device and preparation method thereof |
| CN109145682B (en) * | 2017-06-16 | 2022-02-22 | 固安翌光科技有限公司 | Optical fingerprint identification device and preparation method thereof |
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Application publication date: 20120222 |