CN206147657U - Slim optical fingerprint sensor - Google Patents
Slim optical fingerprint sensor Download PDFInfo
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- CN206147657U CN206147657U CN201620820854.9U CN201620820854U CN206147657U CN 206147657 U CN206147657 U CN 206147657U CN 201620820854 U CN201620820854 U CN 201620820854U CN 206147657 U CN206147657 U CN 206147657U
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- optical prism
- angle
- prism
- optical
- fingerprint sensor
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Abstract
The utility model provides a slim optical fingerprint sensor, include: a housing. Optical prism locates this casing, this optical prism include the collection face of locating the top, with gather in the face of should and be located the optical prism bottom the bottom surface, locate the mirror surface of optical prism one end and locate the output face of the optical prism other end, softness circuit board, this casing are located on this softness circuit board, the light source, locate this softness circuit board on, and the bottom surface of this light source corresponding to this optical prism, and image sensory unit, locate this softness circuit board on, corresponding to this optical prism's output face, wherein the light that sends of this light source gets into this optical prism via this bottom surface to form an image light beam by placing after the reflection of the finger fingerprint of this collection face, this image light beam gets into this image sensory unit via this output face after by this specular reflection again, and reaches reducible optical prism's thickness, is applicable to various fingerprint collection areas, and increases the efficiency of fingerprint image like xie xidu.
Description
Technical field
The utility model is a kind of thin optical fingerprint sensor, it is espespecially a kind of can using as fingerprint collecting identification
Thin optical fingerprint sensor.
Background technology
Press, general existing optical fingerprint image capture device, generally can by prism, convex lens, image sensor and
Light source is constituted, and wherein the prism is arranged in del, the first side of convex lens correspondence prism, the image sensor with
Convex lens correspondence, and the second side of the light source correspondence prism.
When deployed, it is the 3rd side that allows operator that fingerprint is placed in prism, now light source is simultaneously by prism
Second side is irradiated, and makes light reflex to the first side of prism by fingerprint image, and then makes light enter convex lens
After focus on image sensor, using carries out fingerprint collecting identification.
So, for above-mentioned known optical fingerprint image capture device, the volume of its prism is normally limited to shape
And cannot reduce, lead to not effectively apply on the current electronic installation for minimizing.
To solve the disappearance of existing optical fingerprint image capture device, just there is Patents such as People's Republic of China's invention
Patent discloses " fingerprint collecting method and the high-resolution thin type fingerprint collector " of No. CN101034437A, and it is to solve existing skill
Art collection face is little, poor definition problem, and its method is to cut out an inclined-plane in the side of prism, and light source is arranged near inclined-plane,
The light sent from light source through prism side-irradiation to prism bottom surface, the fingerprint on prism bottom surface is reflected via prism
Reflection and project on photoelectric detector.Photoelectric detector is configured in prism straight middle surface side, and the oblique girdle plane of prism is equipped with instead
Minute surface is penetrated, lens outside is configured with diagonally disposed reflective mirror, and reflective mirror top is photoelectric detector, and its feature is arranged in light source
It is on the side of prism, and has fingerprint reflecting surface big, collection area is big, the advantage of high definition.
Although above-mentioned Patent Case is light is entered after prism, then is exported to photoelectric detector, mat in the way of reflecting
In the way of using reflected light path shorten single light path, and then reach the volume for reducing fingerprint acquisition device, so, though this mode
Can improve the disappearance of existing optical fingerprint image capture device, but with those existing fingerprint image capture devices for, still cannot
Meet the electronic product being increasingly thinned at present, therefore, above-mentioned all kinds of existing products still have weak point in practice.
In view of this, present inventor spy concentrates on studies, and develops a kind of thin optical fingerprint sensor, can enter one
Step reduces the thickness of prism to improving the disappearance of above-mentioned prior art.
Utility model content
Main purpose of the present utility model is that light source is arranged at into the bottom surface of optical prism, allows operator to put in fingerprint
On the collection face of being put in, the light source for making light-emitting component is irradiated on fingerprint by prism bases input, and with the minute surface of the optical prism
The reflection of light is carried out, afterwards by output face as the output after light line reflection, allows image sensing unit to receive light and be formed
One fingerprint image, and reach the effect for reducing the volume with the esolving degree for increasing fingerprint image of optical fingerprint sensor.
In order to achieve the above object, the preferred embodiment of thin optical fingerprint sensor of the present utility model includes：One housing；
One optical prism, in the housing, the optical prism includes collection face, and the position corresponding with collection face for being located at top
Bottom surface in optical prism bottom, one located at optical prism one end minute surface and one located at the optical prism other end output face；
One flexible circuit board, the housing is on the flexible circuit board；One light source, on the flexible circuit board, and the light source correspondence
In the bottom surface of the optical prism；And an image sensing unit, on the flexible circuit board, corresponding to the defeated of the optical prism
Appear, the light that wherein light source sends is entered in the optical prism, and by being positioned over the finger in the collection face via the bottom surface
An image beam is formed after fingerprint reflection, the image beam enters the image sensing by the mirror-reflection via the output face again
Unit.
In the above embodiments, the housing is provided with a receiving portion, for housing the optical prism, the bottom of the receiving portion
It is provided with multiple through holes.
In the above embodiments, between the minute surface of the optical prism and collection face have one first angle, the minute surface with
There is one second angle between bottom surface, there is one the 3rd angle between the output face and collection face, and the output face and bottom surface it
Between have one the 4th angle.
In the above embodiments, the first angle of the optical prism is 75～85 degree, and second angle is 95～105
Degree, the 3rd angle and the 4th angle are 90 degree.
In the above embodiments, the optical prism is made up of transparent materials such as glass, plastic cement, quartz or crystals.
In the above embodiments, the flexible circuit board is provided with a light source, at least a resistor and an image sensing
Unit.
In the above embodiments, the light source includes multiple LED light-emitting components, in being respectively arranged at the through hole of the housing.
In the above embodiments, the LED light-emitting component such as this is configured to multiple rows of light-emitting component, and its mode for arranging is to make this
The light refraction angle of optical prism is in the range of critical angle.
In the above embodiments, the image sensing unit include a lens, located to should optical prism output face；
One speculum, on the inner face on the housing front inclined-plane；And the image sensing receiver below the speculum.
Description of the drawings
Fig. 1 is three-dimensional appearance schematic diagram of the present utility model；
Fig. 2 is three-dimensional element decomposing schematic representation of the present utility model；
Fig. 3 is light path schematic diagram when the utility model is used；
Fig. 4 is the schematic diagram of prism of the present utility model；
Fig. 5 A are that principle is illustrated with reference to figure；
Fig. 5 B are known luminaire irradiates schematic diagrams；
Fig. 5 C are light source irradiates schematic diagrams of the present utility model.
Reference
1：Housing
11：Receiving portion
12：Through hole
2：Optical prism
21：Collection face
211：Fingerprint rest area
22：Bottom surface
23：Minute surface
24：Output face
201：First angle
202：Second angle
203：3rd angle
204：4th angle
3：Flexible circuit board
4：Light source
5：Resistor
6：Image sensing unit
61：Lens
62：Speculum
621：Inclination angle
63：Image sensing receiver
a：Left end point
b：Right endpoint
A1：First incident ray
B1：First reflected ray
A2：Second incident ray
B2：Second reflected ray
N1：The refractive index of first medium
N2：The refractive index of second medium
α1：The incidence angle of first medium
α2：The refraction angle of second medium
A：Fingerprint collecting face width
B：Dark background face width
d：Prism thickness
Specific embodiment
To be fully understood by the purpose of this utility model, feature and effect, hereby by following specific embodiments, and coordinate institute
Attached schema, is described in detail as rear to the utility model.
Fig. 1, Fig. 2, Fig. 3, Fig. 4 are referred to, it is three-dimensional appearance schematic diagram respectively of the present utility model, of the present utility model vertical
The schematic diagram of volume elements part decomposing schematic representation, light path schematic diagram of the present utility model and prism of the present utility model.As schemed
Show：The utility model is a kind of thin optical fingerprint sensor, including a housing 1, an optical prism 2, a flexible circuit
Plate 3, a light source 4, a resistor 5 and an image sensing unit 6.
As shown in Fig. 2 the housing 1 of preferred embodiment of the present utility model has a receiving portion 11, receiving portion 11 is concave
Shape, and optical prism 2 can be housed, six through holes 12 are provided with the bottom surface of receiving portion 11, for wearing six LED light-emitting components
The light source 4 for being constituted, six light sources 4 are arranged on flexible circuit board 3, and the grade light source 4 corresponds to the bottom surface 22 of optical prism 2,
Flexible circuit board 3 is arranged at the bottom of housing 1, and the housing 1 is installed on flexible circuit board 3, makes six light sources 4 be located at each through hole
In 12.In the present embodiment, light source 4 includes 2 row's LED light-emitting components, and each discharge optical element respectively has 3 LED light-emitting components；It is many
Individual resistor 5 is located at flexible circuit board 3, is used as the power control circuit for adjusting each LED light-emitting component.Image sensing unit
6 are arranged at opposite side of the flexible circuit board 3 relative to light source 4, and it includes a lens 61, located at the defeated of correspondence optical prism 2
Appear 24 front position；One speculum 62, on the inner face on the front inclined-plane of housing 1；And one under the speculum 62
The image sensing receiver 63 of side.
Please refer to Fig. 3, when using, the light that light source 4 sends enters the prism via the bottom surface 22 of optical prism 2
In, and by an image beam is formed after the finger print reflection in the collection face of being positioned over 21, the image beam is again by optical prism 2
After minute surface 23 reflects, via output face 24 image sensing unit 6 is entered.
Fig. 3 and Fig. 4 is referred to, optical prism 2 includes a collection face with a fingerprint rest area 211 for being located at top
21st, one is corresponding with collection face 21 and bottom surface 22, positioned at the bottom of optical prism 2 be located at the one end of optical prism 2 minute surface 23 and
One output face 24 for being located at the other end of optical prism 2, and there is one first angle 201 between the minute surface 23 and collection face 21, should
There is one second angle 202 between minute surface 23 and bottom surface 22, there is one the 3rd angle 203 between output face 24 and collection face 21,
And with one the 4th angle 204 between output face 24 and bottom surface 22.When optical prism 2 is positioned over receiving portion 11, light source 4 is face
Bottom surface 22 to optical prism 2, the light that light source 4 sends is from bottom surface 22 into optical prism 2 and exposes to the collection face of being positioned over
Finger print (not shown) on 21 fingerprint rest area 211, the light for being sent light source 4 by the concave convex texture of fingerprint is linear
It is into the second incident ray A2 of the first incident ray A1 and right endpoint b of the left end point a of fingerprint rest area 211 then anti-via minute surface 23
Become the first reflected ray B1 and the second reflected ray B2 after penetrating, light B1, B2 leave optical prism 2 by output face 24, via lens
After 61 converge, image sensing receiver 63 is reflexed to by speculum 62, by the setting of speculum 62, image sensing list can be reduced
The volume of unit 6, and increase image esolving degree；In the present embodiment, the angle at the inclination angle 621 of speculum 62 is 20～40 degree, figure
As inducing receiver 63 is a CMOS.
As shown in figure 4, the first angle 201 of optical prism 2 is acute angle, the second angle 202 is obtuse angle, the 3rd angle 203
It is an appropriate angle with the 4th angle 204, and makes the light that light source 4 sends that there is above-mentioned light path.It is preferred that in this reality
In applying example, the first angle 201 is 75～85 degree, and the second angle 202 is 95～105 degree, the 3rd angle 203 and the 4th angle 204
It is all 90 degree；Optical prism 2 is made up of transparent materials such as glass, plastic cement, quartz or crystals.
Fig. 5 A, Fig. 5 B, Fig. 5 C are referred to, respectively principle is illustrated with reference to figure, known luminaire irradiates schematic diagram and this reality
With new light source irradiates schematic diagram.As shown in Figure 5A, light from a kind of medium be slanted through another kind of medium when, the angle of light is sent out
Changing, this is relevant with the refractive index of medium.As illustrated, drawing upper hanging down on the interface of the first medium and second medium
Straight normal, the angle pin of light can produce total reflection to normal based on certain numerical limits.Wherein N1 is the folding of first medium
Penetrate rate, N2 for second medium refractive index, α1For the incidence angle of first medium, α2For the refraction angle of second medium, in the present embodiment
In, the medium of N1=1 when first medium is air, N2 can be the transparent materials such as glass, plastic cement, quartz or crystal, its folding
The rate of penetrating is about N2=1.5.Substitute into the incidence angle and the equation at refraction angle with regard to two kinds of different mediums：
N1Sin α 1=N2Sin α 2；
With N1=1, α1=90 °, when N2=1.5 substitutes into above formula, obtain α2=42 °.Work as α2When from 0 ° to more than 42 °, α1
Just more than 90 °, and total reflection is produced in second medium, now α2=42 ° is critical angle, that is to say, that by optical prism 2
Refraction light in α2=0 °～α2When=42 °, the light that just can project becomes needed for fingerprint collecting area 211 outside prism is used.
As shown in Figure 5 B, it is known that light source radiation modality be to cut out an inclined-plane in the side of prism, light source is arranged on inclined-plane
The irradiation mouth for being formed.The dark background fingerprint collecting principle of this product be using LED between fingerprint collecting face and its vertical line
Angle be the irradiation of 42 degree directions, therefore this light is when passing through fingerprint collecting face, just the dark background face of formation black.Fingers
The texture of line contact produces reflex, just forms the white fingerprint texture in black background.If laterally to refer to from prism two
Line collection face according to 42 degree of irradiation lights, just can need to make prism thickness d more than half ability of fingerprint collecting face width A
OK, i.e. d ＞ A/2, prism thickness d is more than 1/2nd of fingerprint collecting face width A.
As shown in Figure 5 C, radiation modality of the present utility model is to arrange the LED/light source 4 of two rows in the bottom surface of optical prism 2,
The range of exposures in each 42 degree of directions in both sides is formed to the perpendicular line in fingerprint collecting face, by this radiation modality, can be by optics rib
The thickness d of mirror 2 is fabricated to a quarter of only fingerprint collecting face width A, i.e. d=1/4A.
Fig. 2 is referred to, two row of the present utility model amounts to 6 LED/light sources only to be irradiated respective effective range, i.e. fingerprint and adopt
1/6 region of collection face A；Each LED light-emitting component gives 0～42 degree of refracted light, and these refracted light transmissives go out prism
And form dark background face B.As shown in Figure 5 C, by this new light source configuration mode, each LED/light source is distinguished from prism both sides
42 ° are irradiated to fingerprint collecting face, the light refraction angle of the optical prism is made in the range of the critical angle for producing total reflection, with regard to energy
The width A for making fingerprint collecting face reaches four times of prism thickness d, therefore the utility model can allow prism thickness d to be adopted than fingerprint
It is less that the width A in collection face becomes, and reaches the effect of slimming fingerprint capturer.
Thin optical fingerprint sensor of the present utility model has the fingerprint collecting area bigger than prior art, and can be with
Make prism thickness less than what the width in fingerprint collecting face became, therefore, it is possible to apply to effective fingerprint collecting area for 6*6 millimeters
All fingerprint acquisition devices between 60*60 millimeters (mm), and reaching can reduce the thickness of optical prism, it is adaptable to various fingers
Line gathers area, and effect of increase fingerprint image esolving degree, with practical value undoubtedly, really possesses needed for applying for a patent
Novelty, creativeness and industry applications important document, whence proposes utility application in accordance with the law.
Only as described above, preferred embodiment only of the present utility model is made according to the utility model claim such as
Impartial design variation, should be technical scope of the present utility model and covered.
Claims (10)
1. a kind of thin optical fingerprint sensor, it is characterised in that described thin optical fingerprint sensor includes：
One housing；
One optical prism, in the housing, the optical prism include one located at top collection face, one with collection face
The corresponding and bottom surface positioned at optical prism bottom, one are located at the minute surface and of optical prism one end located at the optical prism other end
Output face；
One flexible circuit board, the housing is on the flexible circuit board；
One light source, on the flexible circuit board, and the light source is corresponding to the bottom surface of the optical prism；
One resistor, on the flexible circuit board；And
One image sensing unit, corresponding to the output face of the optical prism, wherein the light that the light source sends is via described
The bottom surface of optical prism enters the optical prism, and forms an image by being positioned over after the reflection of the finger print in the collection face
Light beam, described image light beam enters described image sensing unit via the output face again by the mirror-reflection.
2. thin optical fingerprint sensor according to claim 1, it is characterised in that the housing is provided with a receiving portion,
For housing the optical prism, the bottom of described accommodation section is provided with multiple through holes.
3. thin optical fingerprint sensor according to claim 1, it is characterised in that the minute surface of the optical prism with adopt
Between collection face have one first angle, between the minute surface and bottom surface have one second angle, the output face with collection face it
Between have one the 3rd angle, and between the output face and bottom surface have one the 4th angle.
4. thin optical fingerprint sensor according to claim 3, it is characterised in that the first angle of the optical prism
For 75～85 degree, second angle is 95～105 degree, and the 3rd angle and the 4th angle are 90 degree.
5. thin optical fingerprint sensor according to claim 1, it is characterised in that the optical prism is glass, modeling
Glue, quartz or crystal transparent material are made.
6. thin optical fingerprint sensor according to claim 1, it is characterised in that the flexible circuit board is provided with
Light source, at least a resistor and an image sensing unit.
7. thin optical fingerprint sensor according to claim 1, it is characterised in that the light source includes multiple LED and sends out
Optical element, in being respectively arranged at the through hole of the housing.
8. thin optical fingerprint sensor according to claim 7, it is characterised in that the plurality of LED light-emitting component is matched somebody with somebody
Multiple rows of light-emitting component is set to, its mode for arranging is the light refraction angle for making the optical prism in the range of critical angle.
9. thin optical fingerprint sensor according to claim 1, it is characterised in that described image sensing unit includes
Lens, located at the output face of the correspondence optical prism；One speculum, located at the inner face on the front inclined-plane of the housing；And
The one image sensing receiver below the speculum.
10. thin optical fingerprint sensor according to claim 9, it is characterised in that the angle at the inclination angle of the speculum
Spend for 20～40 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620820854.9U CN206147657U (en) | 2016-08-01 | 2016-08-01 | Slim optical fingerprint sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620820854.9U CN206147657U (en) | 2016-08-01 | 2016-08-01 | Slim optical fingerprint sensor |
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| Publication Number | Publication Date |
|---|---|
| CN206147657U true CN206147657U (en) | 2017-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620820854.9U Active CN206147657U (en) | 2016-08-01 | 2016-08-01 | Slim optical fingerprint sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107679440A (en) * | 2016-08-01 | 2018-02-09 | 安帝司股份有限公司 | Thin optical fingerprint sensor |
| CN108932460A (en) * | 2017-05-26 | 2018-12-04 | 上海箩箕技术有限公司 | Fingerprint imaging mould group and electronic equipment |
| CN110175494A (en) * | 2018-07-06 | 2019-08-27 | 神盾股份有限公司 | Optical finger print sensing device |
| CN110457986A (en) * | 2019-06-04 | 2019-11-15 | 广州汉玛智慧信息技术有限责任公司 | A kind of ultra-thin moisture-proof finger print information acquisition terminal |
| WO2020015436A1 (en) * | 2018-07-20 | 2020-01-23 | 华为技术有限公司 | Electronic device having texture detection function |
-
2016
- 2016-08-01 CN CN201620820854.9U patent/CN206147657U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107679440A (en) * | 2016-08-01 | 2018-02-09 | 安帝司股份有限公司 | Thin optical fingerprint sensor |
| CN108932460A (en) * | 2017-05-26 | 2018-12-04 | 上海箩箕技术有限公司 | Fingerprint imaging mould group and electronic equipment |
| CN110175494A (en) * | 2018-07-06 | 2019-08-27 | 神盾股份有限公司 | Optical finger print sensing device |
| WO2020015436A1 (en) * | 2018-07-20 | 2020-01-23 | 华为技术有限公司 | Electronic device having texture detection function |
| US11474394B2 (en) | 2018-07-20 | 2022-10-18 | Huawei Technologies Co., Ltd. | Electronic device with pattern detection function |
| CN110457986A (en) * | 2019-06-04 | 2019-11-15 | 广州汉玛智慧信息技术有限责任公司 | A kind of ultra-thin moisture-proof finger print information acquisition terminal |
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