CN206657152U - Biological identification device - Google Patents
Biological identification device Download PDFInfo
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- CN206657152U CN206657152U CN201720332311.7U CN201720332311U CN206657152U CN 206657152 U CN206657152 U CN 206657152U CN 201720332311 U CN201720332311 U CN 201720332311U CN 206657152 U CN206657152 U CN 206657152U
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Abstract
The utility model provides a kind of biological identification device.Biological identification device includes light-guide device, light source and image capture element.Light-guide device includes first surface, second surface, lateral wall, madial wall and bottom surface.Bottom surface or the incidence surface that lateral wall is light-guide device.Incidence surface has multiple first optical microstructures.The angle of divergence of first optical microstructures converging beam, acted on by thing to be identified after the first surface that light beam passes through light-guide device, image capture element receives the light beam acted on by thing to be identified, to obtain the image of thing to be identified.Thereby, light beam is concentrated in the outgoing beam field pattern of the first surface of light-guide device, and then improves the capture quality of thing to be identified.
Description
Technical field
It the utility model is related to a kind of biological identification device.
Background technology
The species of bio-identification includes face, sound, iris, retina, vein and fingerprint recognition etc..Due to everyone
Fingerprint is all unique, and fingerprint is not easy to change with age or physical condition, therefore fingerprint identification device is
As a kind of current most popular biological identification device.According to the difference of sensing mode, fingerprint identification device can be divided into optical profile type
With condenser type.Capacitance type fingerprint identification device be assembled in electronic product (such as：Mobile phone, tablet personal computer) when, capacitance type fingerprint is known
It is above other device to be provided with protection element (cover lens) more, and the sensing effect of capacitance type fingerprint identification device can be protected
The influence of element.Therefore, optical fingerprint identification device is also by attention.
Optical fingerprint identification device includes light source, image capture element and translucent element.Light source to send light beam, with
Irradiation is pressed against the finger on translucent element.The fingerprint of finger is made up of a plurality of irregular burr with dimpled grain.By burr
It can be formed as the fingerprint image of light and shade staggeredly on the receiving plane of image capture element with the light beam of dimpled grain reflection.Image obtains member
Part can be converted to fingerprint image corresponding image information, and image information is inputted to processing unit.Processing unit is available
Algorithm calculates the image information corresponding to fingerprint, to carry out the identification of user.However, during above-mentioned capture,
Image capture element is easily dispersedly transferred to by the light beam that fingerprint reflects, and causes capture quality bad, influences recognition result.
Utility model content
The utility model provides a kind of biological identification device.
According to embodiment of the present utility model, biological identification device includes light-guide device, light source and image capture element.
Light-guide device includes first surface, second surface, lateral wall, madial wall and bottom surface.Second surface is arranged at pair of first surface
To.Lateral wall is connected with first surface and extended to side where second surface.Madial wall is connected with second surface and is arranged at outer
Side wall to.Bottom surface be arranged at first surface to and be connected between lateral wall and madial wall.Bottom surface or lateral wall are
The incidence surface of light-guide device, and incidence surface has multiple first optical microstructures.Light source is sending light beam.Image capture element
Set relative to the second surface of light-guide device.Light beam enters light-guide device, multiple first optical microstructures convergences from incidence surface
The angle of divergence of light beam, acted on by thing to be identified after the first surface that light beam passes through light-guide device, and image capture element receives quilt
The light beam of thing effect to be identified, to obtain the image of thing to be identified.
In the biological identification device according to embodiment of the present utility model, bottom surface is the incidence surface of light-guide device, and every
Direction extension of one first optical microstructures along the outside side wall of madial wall.
In the biological identification device according to embodiment of the present utility model, lateral wall is the incidence surface of light-guide device, and
Direction extension of every one first optical microstructures along first surface to bottom surface.
In the biological identification device according to embodiment of the present utility model, institute of multiple first optical microstructures towards light source
It is raised in side.
In the biological identification device according to embodiment of the present utility model, multiple first optical microstructures include multiple micro-
Prism, and multiple drift angles of multiple microprisms point to the place side of light source.
In the biological identification device according to embodiment of the present utility model, every one first optical microstructures have to light source
The raised curved surface in place side.
In the biological identification device according to embodiment of the present utility model, multiple first optical microstructures include multiple micro-
Prism and multiple sub- optical microstructures respectively with multiple curved surfaces, the place side of plurality of curved surface to light source are raised.
In the biological identification device according to embodiment of the present utility model, multiple microprisms and multiple sub- optical microstructures
It is alternately arranged.
In the biological identification device according to embodiment of the present utility model, every one first optical microstructures with light source
There is height H, every one first optical microstructures have width on the direction vertical with the optical axis of light source on the parallel direction of optical axis
The ratio H/W for spending W, height H and width W is less than 0.3.
In the biological identification device according to embodiment of the present utility model, every one first optical microstructures with light source
There is width W, multiple first optical microstructures are arranged with spacing P, and width W and spacing P ratio W/P are big on the vertical direction of optical axis
In or equal to 0.001 and less than or equal to 1.
In the biological identification device according to embodiment of the present utility model, the second surface of light-guide device has multiple
Two optical microstructures, every one second optical microstructures have an at least reflecting surface, light beam by every one second optical microstructures extremely
A few reflective surface, with the collimatedly first surface transmission to light-guide device.
In the biological identification device according to embodiment of the present utility model, an at least reflecting surface include the first reflecting surface with
Second reflecting surface, the first reflecting surface and the second reflecting surface tilt relative to the first surface of light-guide device, the first reflecting surface and the
The incline direction of two reflectings surface is on the contrary, wherein light beam is sequentially reflected by the first reflecting surface of every one second optical microstructures and second
Face is reflected, with the collimatedly first surface transmission to light-guide device.
In the biological identification device according to embodiment of the present utility model, an at least reflecting surface includes curved surface, wherein light
Beam is reflected at the difference two of curved surface, with the collimatedly first surface transmission to light-guide device.
In the biological identification device according to embodiment of the present utility model, the second surface of light-guide device has multiple
Three optical microstructures.Every one the 3rd optical microstructures have reflecting surface, and biological identification device also includes control optical element.Control optical element
Between the second surface of light-guide device and image capture element, wherein light beam is by the reflecting surface of every one the 3rd optical microstructures
Reflection, obliquely to transmit and by the first surface of light-guide device to thing to be identified, the light beam transmission acted on by thing to be identified
To control optical element, the refraction of control optical element and the reflected beams so that beam collimation to image capture element transmission.
In the biological identification device according to embodiment of the present utility model, reflecting surface relative to light-guide device the first table
Face tilts.
In the biological identification device according to embodiment of the present utility model, reflecting surface is curved surface.
In the biological identification device according to embodiment of the present utility model, control optical element includes multiple microprisms.It is each
Microprism has bottom surface and multiple sides, and multiple sides tilt relative to the first surface of light-guide device, the inclination of multiple sides
In the opposite direction, bottom surface is connected between multiple sides, wherein the light beam acted on by thing to be identified is sequentially by one of multiple sides
Reflect, be emitted by another reflection of multiple sides by bottom surface.
In the biological identification device according to embodiment of the present utility model, biological identification device also includes collimating element.
Collimating element is located between second surface and the image capture element of light-guide device.
In the biological identification device according to embodiment of the present utility model, thing to be identified include fingerprint, vein, palmmprint or
It is combined.
Based on above-mentioned, the biological identification device of the embodiment of the utility model one includes light-guide device, light source and image and obtained
Element.Particularly, the incidence surface of light-guide device has multiple first optical microstructures, the first optical microstructures energy converging beam
The angle of divergence.Thereby, light beam the first surface of light-guide device outgoing beam field pattern concentrate, by thing to be identified effect (such as：It is unrestrained
Penetrate) the outgoing beam field pattern of light beam can also concentrate.Consequently, it is possible to the light beam acted on by thing to be identified passes through the machine of collimating element
Rate is lifted, and then that improves thing to be identified takes shadow quality.
Brief description of the drawings
Comprising accompanying drawing to further understand the utility model, and accompanying drawing is incorporated in this specification and forms this specification
A part.Embodiment of the present utility model is illustrated, and is used to explain principle of the present utility model together with the description.
Fig. 1 is the diagrammatic cross-section of the biological identification device of the embodiment of the utility model one；
Fig. 2 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of the embodiment of the utility model one；
Fig. 3 shows the light distribution on the light receiving surface of image capture element 140 under each height to width ratio H/W；
Fig. 4 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of another embodiment of the utility model；
Fig. 5 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of the another embodiment of the utility model；
Fig. 6 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of the utility model another embodiment；
Fig. 7 is the diagrammatic cross-section of the biological identification device of the embodiment of the utility model one；
Fig. 8 is the diagrammatic cross-section of the biological identification device of another embodiment of the utility model；
Fig. 9 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of another embodiment of the utility model；
Figure 10 is the diagrammatic cross-section of the biological identification device of the another embodiment of the utility model；
Figure 11 shows the control optical element of the another embodiment of the utility model and the light beam that is reflected by thing to be identified is in leaded light
Transmission and then incident image obtain the process of element in element and control optical element；
Figure 12 is the diagrammatic cross-section of the biological identification device of the utility model another embodiment；
Figure 13 is the diagrammatic cross-section of the biological identification device of the embodiment of the utility model one.
Drawing reference numeral explanation
10：Thing to be identified；
100、100A、100B、100C、100D、100E：Biological identification device；
110：Light-guide device；
112：First surface；
113：Groove；
114：Second surface；
116：Lateral wall；
118：Madial wall；
119、119a、119b、196a：Bottom surface；
120、120A：Second optical microstructures；
120C：3rd optical microstructures；
122、123、124：Reflecting surface；
125：Joint face；
126、127、199a：Curved surface；
130：Light source；
140：Image capture element；
142：Pixel region；
150：Circuit board；
160：Translucent element；
162：Surface；
170、190、192：Optical cement；
180：Collimating element；
184：Transparent area；
196：Control optical element；
199、199’：First optical microstructures；
196-1、199A：Microprism；
196b、196c：Side；
A-A’：Hatching line；
H：Highly；
K：Gap；
L：Light beam；
P：Spacing；
S1~S6：Curve；
W：Width；
x、y、z：Direction；
X：Optical axis；
Y：Reference axis；
α、α’：The angle of divergence；
β：Drift angle；
γ：Prism angle；
θ：The angle of emergence；
θ’：Angle.
Embodiment
With detailed reference to one exemplary embodiment of the present utility model, the example of one exemplary embodiment is illustrated in accompanying drawing
In.Whenever possible, similar elements symbol is used for representing same or similar part in the accompanying drawings and the description.
Fig. 1 is the diagrammatic cross-section of the biological identification device of the embodiment of the utility model one.It refer to Fig. 1, bio-identification
Device 100 includes light-guide device 110, light source 130 and image capture element 140.Light-guide device 110 has relative first surface
112 with second surface 114.Light-guide device 110 also has lateral wall 116, madial wall 118 and bottom surface 119.Lateral wall 116 and
One surface 112 connects and extended to the place side of second surface 114.Madial wall 118 is connected with second surface 114 and is arranged at outside
Wall 116 to.Bottom surface 119 be arranged at first surface 112 to and be connected between lateral wall 116 and madial wall 118.
In the present embodiment, madial wall 118 goes out groove 113 with the definable of second surface 114.The material of light-guide device 110 can be glass, gather
Carbonic ester (PC), polymethyl methacrylate (PMMA) or other suitable materials, but the utility model is not limited.
In the present embodiment, the second surface 114 of light-guide device 110 has multiple second optical microstructures 120.Second light
Learning micro-structural 120 can be formed in one with light-guide device 110.But the utility model not limited to this, in other embodiments, second
Optical microstructures 120 can also make respectively with light-guide device 110, then, then the second optical microstructures 120 is configured at into guide-lighting member
On part 110.It is worth noting that, every one second optical microstructures 120 have an at least reflecting surface.For example, in this implementation
In example, every one second optical microstructures 120 have the first reflecting surface 122 and the second reflecting surface 124.First reflecting surface 122 and
Two reflectings surface 124 tilt relative to the first surface 112 of light-guide device 110, and the first reflecting surface 122 and the second reflecting surface 124
Incline direction it is opposite.In the present embodiment, the first reflecting surface 122 and the second reflecting surface of same second optical microstructures 120
124 can be directly connected to, and the second optical microstructures 120 can be in that V-shape is raised.But the utility model not limited to this, in other realities
Apply in example, the second optical microstructures 120 also can be in other suitable shapes, and at least the one of every one second optical microstructures 120 reflect
Face is not necessarily intended to be made up of multiple planes (i.e. the first reflecting surface 122 and the second reflecting surface 124).
Light source 130 is sending light beam L.In the present embodiment, light beam L be, for example, black light (such as：Infrared light).But
The utility model not limited to this, in other embodiments, light beam L can also be visible ray (such as：Feux rouges, blue and green light or its
Combination) or visible ray and black light combination.In the present embodiment, light source 130 is, for example, light-emittingdiode.But this practicality is new
Type not limited to this, in other embodiments, the light-emitting component of light source 130 or other appropriate species.Fig. 1 shows a light source
130 be example, and light source 130 is arranged on the one side of light-guide device 110.But the utility model not limited to this, in other embodiment
In, the quantity of light source 130 be alternatively it is multiple, and/or light source 130 may also be arranged on light-guide device 110 bilateral or more than three
Side.
In the present embodiment, bottom surface 119 can be the incidence surface of light-guide device 110.Light beam L can be from light-guide device 110 extremely
Least a portion of bottom surface 119a enters in light-guide device 110.Furthermore, biological identification device 100 also includes circuit board
150.Light source 130 is configured on circuit board 150 and is electrically connected with circuit board 150.At least part of bottom of light-guide device 110
Face 119b can be fixed on circuit board 150.The portion bottom surface 119a of light-guide device 110 is optionally depression.Light source 130 can
Optionally it is configured in the space that portion bottom surface 119a crosses with circuit board 150.But the utility model not limited to this, another
In embodiment, circuit board 150 can have depression (not shown), and light source 130 is configured in the depression of circuit board 150, led
The bottom surface 119 of optical element 110 is configured in above the depression of circuit board 150, and light beam L also can be located at circuit board 150 certainly
The depression above bottom surface 119 enter light-guide device 110.It should be noted that the position of above-mentioned light source 130 and light beam L enter
The region for penetrating light-guide device 110 is only to illustrate the utility model and be not used to limit the utility model, other implementations
In example, light source 130 can also be configured also can be from the incident guide-lighting member in other regions of light-guide device 110 in other appropriate locations, light beam L
Part 110.
Image capture element 140 is set relative to the second surface 114 of light-guide device 110.In detail, in the present embodiment
In, image capture element 140 is configured on circuit board 150 and is electrically connected with circuit board 150.Furthermore, at this
In embodiment, the second surface 114 of light-guide device 110 and the definable of madial wall 118 go out groove 113, and image capture element 140
It is configurable in the groove 113 of light-guide device 110, but the utility model is not limited.Image capture element 140 has array
Multiple pixels (pixel) area 142 of arrangement, acted on by thing 10 to be identified with to receive (such as：Diffusion) light beam L, and then obtain
The image of thing 10 to be identified.In the present embodiment, image capture element 140 can be charge coupled cell (charge-coupled
device；CCD), complementary metal oxide semiconductor (complementary metal oxide semiconductor；
CMOS) or other appropriate species image sensor array.
In the present embodiment, biological identification device 100 also includes translucent element 160.Translucent element 160 is configured at guide-lighting member
On the first surface 112 of part 110.Translucent element 160 has backwards to the surface 162 of light-guide device 110.Surface 162 is available for waiting to know
Other thing 10 presses.In the present embodiment, under normal service condition, thing 10 to be identified can be the biological characteristic of biology, such as：
Fingerprint, vein, palmmprint or above-mentioned at least combination etc..But the utility model not limited to this, in abnormal service condition
Under, thing 10 to be identified is also likely to be counterfeit, such as：Prosthetic finger.In the present embodiment, biological identification device 100 also includes light
Learn glue 170.Translucent element 160 can be connected by optical cement 170 with the first surface 112 of light-guide device 110.In the present embodiment
In, the refractive index of translucent element 160, optical cement 170 and light-guide device 110 can be same or like, to reduce light beam L in printing opacity member
Part 160 and the boundary of optical cement 170 and optical cement 170 and the reflection of the boundary of light-guide device 110, and then lift bio-identification dress
Put 100 light utilization ratio and/or capture quality.But the utility model not limited to this, in other embodiments, translucent element
160th, the refractive index of optical cement 170 and light-guide device 110 also can be different.
In addition, it should be noted that, the utility model, which is not intended to limit biological identification device 100, must include translucent element
160, the surface also not limited for thing 10 to be identified pressing must be the surface 162 of translucent element 160.In other embodiment
In, biological identification device 100 also may not include translucent element 160；Furthermore, if light-guide device 110 has enough
Mechanical strength, then the first surface 112 of light-guide device 110 also can be as the surface for thing 10 to be identified pressing, thing 10 to be identified
Also the first surface 112 of light-guide device 110 can directly be pressed.
Being worth noting is, after light source 130 sends light beam L, light beam L can be sequentially anti-by the first of the second optical microstructures 120
Penetrate the reflecting surface 124 of face 122 and second to reflect, collimatedly to transmit to the first surface 112 of light-guide device 110.In other words, pass through
The reflex of second optical microstructures 120, the incidence angle of light beam L incidences first surface 112 can be 0 degree or close to 0 degree of (example
Such as：- 15 degree to+15 degree in the range of, if wherein by first surface 112 normal to light beam L direction for clockwise direction,
The incidence angle is negative value；If by first surface 112 normal to light beam L direction for counterclockwise, the incidence angle
For on the occasion of).It can be acted on after the first surface 112 that light beam L passes through light-guide device 110 by thing 10 to be identified, wherein the effect bag
Include diffusion (diffuse reflection).Light beam L acted on by thing 10 to be identified after can by press surface (such as：Surface 162)
And light-guide device 110 is passed through, element 140 is obtained with incident image.Image capture element 140 receives what is reflected by thing 10 to be identified
Light beam L, to obtain the image of thing 10 to be identified.Particularly, using the reflection of the second optical microstructures 120, light beam L can be collimatedly
Incidence identification thing 10, and then the light beam L for reflecting identified thing 10 is collimatedly transferred to image capture element 140.Thereby, it is biological
The capture increased quality of identification device 100, and then increase the recognition capability of biological identification device 100.
In the present embodiment, biological identification device 100 also includes collimating element 180.Collimating element 180 is configured at guide-lighting member
Between the second surface 114 and image capture element 140 of part 110.For example, in the present embodiment, biological identification device 100
Also include optical cement 190, and collimating element 180 can be connected by optical cement 190 with image capture element 140.But this practicality is new
Type is not limited, and in other embodiments, collimating element 180 utilizes appropriate mechanism (not shown) and image capture element 140
Connection, or collimating element 180 can be formed directly in image capture element 140.It is worth noting that, collimating element 180 has
There are multiple transparent areas 184.Multiple transparent areas 184 distinguish multiple pixel regions 142 that correspondence image obtains element 140.It is to be identified
The light beam L of the everywhere reflection of thing 10 can be transferred to corresponding pixel region 142 by a corresponding transparent area 184, and be not easy
It is transferred to other pixel regions 142.Thereby, the capture quality of biological identification device 100 can be lifted further.But the utility model
Not limited to this, in other embodiments, biological identification device 100 also do not include collimating element 180 optionally.
Fig. 2 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of the embodiment of the utility model one.Fig. 2 can be corresponded to
In Fig. 1 hatching line A-A '.It refer to Fig. 1 and Fig. 2, the incidence surface of light-guide device 110 (such as：Bottom surface 119) have multiple first
Optical microstructures 199.Light beam L from incidence surface (such as：Bottom surface 119) can be by the micro- knot of the first optics when entering light-guide device 110
Structure 199, the angle of divergence (divergence angle) α that the first optical microstructures 199 can restrain (converge) light beam L (are plotted in
Fig. 2).In detail, light source 130 has angle of divergence alpha before light-guide device 110 is introduced into, and light source 130 is passing through the micro- knot of the first optics
Having angle of divergence alpha after structure 199, ', wherein angle of divergence alpha ' is less than angle of divergence alpha.Thereby, first surfaces of the light beam L in light-guide device 110
112 outgoing beam field pattern is concentrated, and the light beam L acted on by thing 10 to be identified outgoing beam field pattern can also be concentrated.Consequently, it is possible to
The probability of the light beam L acted on by thing 10 to be identified through collimating element 180 is lifted, and then improves the brightness of the image of thing 10 to be identified
And/or contrast.
Fig. 1 and Fig. 2 is refer to, in the present embodiment, bottom surface 119 is the incidence surface of light-guide device 110, and every one first light
Learning micro-structural 199 can extend along the direction x of the outside side wall 116 of madial wall 118.In other words, in the present embodiment, every one first
Optical microstructures 199 can be long cylinder, and the long side of the long cylinder can be parallel to direction x.Multiple first optical microstructures 199
It can be arranged along the direction z to interlock with direction x.Every one first optical microstructures 199 can be along direction y towards the place of light source 130
Side is raised.In the present embodiment, multiple first optical microstructures 199 can be multiple microprism 199A, and multiple microprism 199A
Multiple apex angle ss point to light source 130 place side.But the utility model not limited to this, in other embodiments, the first optics are micro-
Structure 199 or other appropriate patterns, other accompanying drawings will be coordinated to illustrate in subsequent paragraph below.
Fig. 2 is refer to, in the present embodiment, every one first optical microstructures 199 are parallel with the optical axis X of light source 130
There is height H, every one first optical microstructures 199 have width on the direction z vertical with the optical axis X of light source 130 on the y of direction
W.Fig. 3 is shown under each height to width ratio H/W in the light distribution on the light receiving surface of image capture element 140, wherein Fig. 3 institutes
The angle shown refers to light beam L and the normal of the light receiving surface of image capture element 140 angle.Fig. 3 is refer to, curve S1 is represented
Light distribution on the light receiving surface of the image capture element 140 of biological identification device without the first optical microstructures 199, it is bent
Line S2 represents to be represented in H/W=under H/W=0.05 in the light distribution on the light receiving surface of image capture element 140, curve S3
In the light distribution on the light receiving surface of image capture element 140 under 0.10, curve S4 represents to be obtained under H/W=0.15 in image
Light distribution on the light receiving surface of element 140, curve S5 are represented under H/W=0.20 in the light-receiving of image capture element 140
Light distribution on face, and curve S6 is represented under H/W=0.25 in the light distribution on the light receiving surface of image capture element 140.
From the figure 3, it may be seen that the ratio H/W and/or the first optics of height H and width W by being suitably designed the first optical microstructures 199 are micro-
The width W and spacing P of structure 199 ratio W/P, light beam L can be concentrated more to the normal of the light receiving surface of image capture element 140,
And further lift the capture quality of image capture element 140.For example, can be by the height H of the first optical microstructures 199
Designed with width W ratio H/W in following scope：H/W<0.3, but the utility model is not limited.First optical microstructures 199
Width W and spacing P ratio W/P can be more than or equal to 0.001 and less than or equal to 1, but the utility model is not limited.
In the embodiment of fig. 2, two first adjacent optical microstructures 199 can be directly connected to, multiple micro- knots of first optics
The spacing P of structure 199 can be equal to the width W of every one first optical microstructures 199.But the utility model not limited to this, Fig. 4 are this reality
With the incidence surface of light-guide device and the diagrammatic cross-section of light source of new another embodiment.In the fig. 4 embodiment, adjacent two
First optical microstructures 199 also can at a distance, and the spacing P of multiple first optical microstructures 199 is also greater than each
The width W of first optical microstructures 199.In other words, the utility model be not intended to limit multiple first optical microstructures 199 must
It is directly connected to, gap (space) K between multiple first optical microstructures 199 can be more than or equal to 0.
Fig. 5 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of the another embodiment of the utility model.Fig. 5's
In embodiment, every one first optical microstructures 199B has to the raised curved surface 199a in the place side of light source 130.Curved surface 199a can
It is raised towards the place side of light source 130 along direction y.Every one first optical microstructures 199B can extend along direction x.In other words,
Each optical microstructures 199 can be long cylinder, and the section of the long cylinder can be in arcuate or semi-circular, but the utility model is unlimited
In this.Similarly, the first optical microstructures 199B also has the effect of converging beam L angle of divergence alpha, using the micro- knot of the first optics
The capture quality of structure 199B biological identification device is also good.
Fig. 6 is the incidence surface of light-guide device and the diagrammatic cross-section of light source of the utility model another embodiment.Fig. 6's
In embodiment, multiple first optical microstructures 199 may include multiple microprism 199A and more with multiple curved surface 199a respectively
Individual sub- optical microstructures 199B.Multiple microprism 199A can be alternately arranged with multiple sub- optical microstructures 199B along direction z.Phase
An adjacent microprism 199A and a sub- optical microstructures 199B can be directly connected to or at a distance.Similarly, it is multiple
The microprism 199A and multiple sub- optical microstructures 199B effect for combining the also angle of divergence alpha with converging beam L, use are multiple
Microprism 199A and the biological identification device of multiple sub- optical microstructures 199B combination capture quality are also good.
Fig. 7 is the diagrammatic cross-section of the biological identification device of the embodiment of the utility model one.It refer to Fig. 7, bio-identification
Device 100A is similar with foregoing biological identification device 100, the incidence surface (example of biological identification device 100A light-guide device 110
Such as：Bottom surface 119) also have can converging beam L the angle of divergence multiple first optical microstructures 199.Biological identification device 100A
It is with the difference of biological identification device 100, biological identification device 100A the second optical microstructures 120A pattern and biology
The pattern of second optical microstructures 120 of identification device 100 is different.In detail, in Fig. 7 embodiment, every one second optics
A micro-structural 120A at least reflecting surface can be curved surface 126.Light beam L is reflected at the difference two of curved surface 126, with collimatedly guide
The first surface 112 of optical element 110 transmits, and then acted on by thing 10 to be identified (such as：Diffusion).Light beam L is by thing 10 to be identified
Act through press surface (such as：Surface 162) and light-guide device 110 is passed through, element 140 is obtained with incident image.Image obtains
Element 140 receives light beam L, to obtain the image of thing 10 to be identified.Biological identification device 100A has and biological identification device 100
The effect of similar and advantage, are just no longer repeated herein.
Fig. 8 is the diagrammatic cross-section of the biological identification device of another embodiment of the utility model.Fig. 9 is that the utility model is another
The incidence surface of the light-guide device of one embodiment and the diagrammatic cross-section of light source.Fig. 9 may correspond to Fig. 8 hatching line A-A '.It refer to
Fig. 8 and Fig. 9, biological identification device 100B are similar with foregoing biological identification device 100, and both difference is, bio-identification
The incidence surface position of device 100B light-guide device 110 is different from the incidence surface position of biological identification device 100.In detail, exist
In Fig. 8 and Fig. 9 embodiment, light source 130 is configured in by the lateral wall 116 of light-guide device 110, and light beam L can be from lateral wall
116 enter light-guide device 110.In other words, the incidence surface of biological identification device 100B light-guide device 110 is lateral wall 116.Class
As, the incidence surface of light-guide device 110 (such as：Lateral wall 116) also have the first optics of energy converging beam L angle of divergence alpha micro-
Structure 199 '.Direction y extension of first optical microstructures 199 ' along first surface 112 to bottom surface 119.Multiple first optics are micro-
Structure 199 ' arranges along direction z.Place side of first optical microstructures 199 ' along direction x towards light source 130 is raised.In this reality
Apply in example, multiple first optical microstructures 199 ' can be multiple microprisms.But the utility model not limited to this, in other embodiment
In, the first optical microstructures 199 ' or with curved surface 199a sub- optical microstructures 199B, sub- optical microstructures 199B with
The combination of microprism or the optical microstructures of other appropriate patterns.Biological identification device 100B has and biological identification device 100
The effect of similar and advantage, are just no longer repeated herein.
Figure 10 is the diagrammatic cross-section of the biological identification device of the another embodiment of the utility model.Figure 10 is refer to, biology
Identification device 100C is similar with biological identification device 100, the incidence surface of biological identification device 100C light-guide device 110 (such as：
Bottom surface 119) also there are energy converging beam L the first optical microstructures 199.Biological identification device 100C and biological identification device
100 difference is that the second surface 114 of biological identification device 100C light-guide device 110 does not have multiple micro- knots of second optics
Structure 120 and have multiple 3rd optical microstructures 120C, the 3rd optical microstructures 120C effect is made with the second optical microstructures 120
With difference；In addition, biological identification device 100C also includes control optical element 196.Mainly illustrate this difference below, both identical or phases
Just no longer repeat corresponding position.
Figure 10 is refer to, in the present embodiment, the 3rd optical microstructures 120C material can with the material of light-guide device 110
It is identical.In other words, the 3rd optical microstructures 120C can be formed in one with light-guide device 110.But the utility model not limited to this,
In other embodiments, the 3rd optical microstructures 120C can also make respectively with light-guide device 110, then, then by the 3rd optics
Micro-structural 120C is configured at the second surface 114 of light-guide device 110.It is worth noting that, every one the 3rd optical microstructures 120C
With reflecting surface 123.In the present embodiment, reflecting surface 123 can be inclined relative to the first surface 112 of light-guide device 110
Plane, but the utility model is not limited.Furthermore, every one the 3rd optical microstructures 120C also has joint face
125.Joint face 125 is connected between two neighboring 3rd optical microstructures 120C two reflectings surface 123.In the present embodiment
In, joint face 125 can tilt relative to the first surface 112 of light-guide device 110, and the inclination of joint face 125 and reflecting surface 123
Direction can be opposite.But the utility model not limited to this, in other embodiments, joint face 125 are also designed to other appropriate samples
State.
Control optical element 196 is configured between the second surface 114 of light-guide device 110 and image capture element 140.In this reality
Apply in example, biological identification device 100C also includes optical cement 192, and control optical element 196 can pass through optical cement 192 and light-guide device
110 second surface 114 connects.But the utility model not limited to this, in other embodiments, control optical element 196 can also be used
Other modes are fixed between light-guide device 110 and image capture element 140.For example, in another embodiment, light member is controlled
Part 196 can also be used retaining element (not shown) and be fixed on the madial wall 118 of light-guide device 110, and be not necessarily intended to directly against
On the second surface 114 of light-guide device 110.
Being worth noting is, after light source 130 sends light beam L, light beam L is anti-by the 3rd optical microstructures 120C reflecting surface 123
Penetrate, to be obliquely transferred to the first surface 112 of light-guide device 110, after the first surface 112 that light beam L passes through light-guide device 110
Acted on by thing 10 to be identified and be transferred to control optical element 196.Particularly, control optical element 196 can reflect and the reflected beams L, so that
Light beam L collimatedly transmits to image capture element 140.Control optical element 196 is illustrated following with Figure 11 to reflect and reflected light
Beam L is so that the mechanism that light beam L collimatedly transmits to image capture element 140.
The light beam L that Figure 11 shows the control optical element 196 of the another embodiment of the utility model and reflected by thing 10 to be identified
Transmission and then incident image obtain the process of element 140 in light-guide device 110 and control optical element 196.It refer to Figure 10 and figure
11, control optical element 196 includes multiple microprism 196-1.Each microprism 196-1 have bottom surface 196a and multiple side 196b,
196c.Multiple side 196b, 196c tilt relative to the first surface 112 of light-guide device 110.Multiple side 196b, 196c's
Incline direction is opposite.Bottom surface 196a is connected between multiple side 196b, 196c.The light beam L that light source 130 is sent is by the 3rd optics
Micro-structural 120C reflecting surface 123 can be transmitted obliquely after reflecting and by the first surface 122 of light-guide device 110 to be identified
Thing 10.Light beam L is acted on by thing 10 to be identified, wherein the effect includes diffusing (diffuse reflection).It is to be identified
Thing 10 act on light beam L by press surface (such as：Surface 162) and light-guide device 110 after can obliquely incident microprism 196-1
Side 196b, light beam L by microprism 196-1 side 196b reflect and be transferred to microprism 196-1 another side 196c,
Microprism 196-1 side 196c the reflected beams L, so that light beam L is emitted from bottom surface 196a and passed to image capture element 140
Pass.It is noted that using the 3rd optical microstructures 120C reflex, the light beam L that light source 130 is sent can be passed obliquely
Be handed to the first surface 112 of light-guide device 110, so obliquely incident press surface (such as：Surface 162), it is larger to be distributed in
Scope.Due to light beam L obliquely incident press surfaces, therefore acted on by thing 10 to be identified (such as：Diffusion) most of light beam L
Obliquely it can be transmitted before control optical element 196 is entered towards image capture element 140.But by control the refraction of optical element 196 with it is anti-
The effect of penetrating, light beam L direction of transfer can change, and light beam L through control optical element 196 after can be collimatedly to image capture element
140 transmit.Thereby, biological identification device 100C can be with sufficient work area, (i.e. light beam L be distributed in the model on press surface
Enclose) under, have good capture quality concurrently, and then increase biological identification device 100C recognition capability.
Figure 11 is refer to, in the present embodiment, each microprism 196-1 of control optical element 196 has prism angle γ.Prism
Angle γ is side 196b and side 196c angle.Microprism 196-1 has refractive index n.In the present embodiment, image obtains member
Part 140 has a light receiving surface 140a, and perpendicular to the light receiving surface 140a of image capture element 140, light beam L passing through reference axis Y
After light-guide device 110 and to be introduced into before control optical element 150 with reference axis Y angle be θ ', and light beam L goes out from what bottom surface 196a was emitted
Firing angle be θ (such as：From the light beam L and reference axis Y of bottom surface 196a outgoing angle).Output angle θ and angle theta ' meet following pass
It is formula：
Using above-mentioned relation formula, prism angle γ size can be suitably designed, and then the light for being emitted automatic control optical element 196
Beam L output angle θ be controlled in certain scope (such as：- 15 °≤θ≤+ 15 °, if wherein normal by bottom surface 196a
To light beam L direction for clockwise, then the incidence angle is negative value；If by bottom surface 196a normal to light beam L direction
For counterclockwise, then the incidence angle be on the occasion of).Thereby, light beam L can be transmitted collimatedly to image capture element 140, and then
Image capture element 140 is obtained the good image of thing to be identified 10, improve biological identification device 100C recognition capability.
Figure 12 is the diagrammatic cross-section of the biological identification device of the utility model another embodiment.Figure 12 bio-identification dress
It is similar with Figure 10 biological identification device 100C to put 100D, both difference is, biological identification device 100D light-guide device
110 incidence surface position is different from biological identification device 100C incidence surface position.In detail, in the fig. 12 embodiment, light
Source 130 is configured in by the lateral wall 116 of light-guide device 110, and light beam L can enter in light-guide device 110 from lateral wall 116.
In other words, the incidence surface of biological identification device 100D light-guide device 110 is lateral wall 116.Biological identification device 100D's leads
Optical element 110 incidence surface (such as：Lateral wall 116) also with the first optical microstructures with the energy converging beam L angles of divergence
199.Biological identification device 100D has the effect of similar with biological identification device 100C and advantage, just no longer repeats herein.
Figure 13 is the diagrammatic cross-section of the biological identification device of the embodiment of the utility model one.Figure 13 biological identification device
100E is similar with Figure 10 biological identification device 100C, and both difference is, biological identification device 100E the 3rd optics is micro-
Structure 120C is different from the 3rd optical microstructures 120C of biological identification device 100.In detail, in Figure 13 embodiment, often
One a 3rd optical microstructures 120C at least reflecting surface can be curved surface 127.Light beam L is reflected by curved surface 127, obliquely to transmit
And pass through the first surface 112 of light-guide device 110 to thing 10 to be identified.Press surface is passed through by the light beam L that thing 10 to be identified acts on
(such as：Surface 162) and light-guide device 110 after can obliquely incident control optical element 196.Control the refraction of optical element 196 and reflection institute
Light beam is stated, so that light beam L collimatedly transmits to image capture element 140.Biological identification device 100E has to be filled with bio-identification
Put 100C similar to the effect of and advantage, just no longer repeat herein.
In summary, the biological identification device of the embodiment of the utility model one includes light-guide device, light source and image acquisition
Element.Particularly, the incidence surface of light-guide device has multiple first optical microstructures, the first optical microstructures energy converging beam
The angle of divergence.Thereby, light beam the first surface of light-guide device outgoing beam field pattern concentrate, by thing to be identified effect (such as：It is unrestrained
Penetrate) the outgoing beam field pattern of light beam can also concentrate.Consequently, it is possible to the light beam acted on by thing to be identified passes through the machine of collimating element
Rate is lifted, and then improves brightness of image and/or the contrast of thing to be identified.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (19)
- A kind of 1. biological identification device, it is characterised in that including：Light-guide device, including：First surface；Second surface, be arranged at the first surface to；Lateral wall, it is connected with the first surface and extends to side where the second surface；Madial wall, be connected with the second surface and be arranged at the lateral wall to；AndBottom surface, be arranged at the first surface to and be connected between the lateral wall and the madial wall, wherein described Bottom surface or the incidence surface that the lateral wall is the light-guide device, and the incidence surface has multiple first optical microstructures；Light source, to send light beam；AndImage capture element, set relative to the second surface of the light-guide device, wherein the light beam enters light described in Face enters the light-guide device, and the multiple first optical microstructures restrain the angle of divergence of the light beam, and the light beam passes through institute Acted on after stating the first surface of light-guide device by thing to be identified, and described image obtains element and received by the thing to be identified The light beam of effect, to obtain the image of the thing to be identified.
- 2. biological identification device according to claim 1, it is characterised in that the bottom surface is described for the light-guide device Incidence surface, and direction extension of every one first optical microstructures along the madial wall to the lateral wall.
- 3. biological identification device according to claim 1, it is characterised in that the lateral wall for the light-guide device institute Incidence surface is stated, and direction of every one first optical microstructures along the first surface to the bottom surface extends.
- 4. biological identification device according to claim 1, it is characterised in that the multiple first optical microstructures are towards described The place side of light source is raised.
- 5. biological identification device according to claim 1, it is characterised in that the multiple first optical microstructures include more Individual microprism, and multiple drift angles of the multiple microprism point to the place side of the light source.
- 6. biological identification device according to claim 1, it is characterised in that every one first optical microstructures have to described The raised curved surface in the place side of light source.
- 7. biological identification device according to claim 1, it is characterised in that the multiple first optical microstructures include more Individual microprism and multiple sub- optical microstructures respectively with multiple curved surfaces, wherein the multiple curved surface is to the place of the light source Side is raised.
- 8. biological identification device according to claim 7, it is characterised in that the multiple microprism and the multiple sub-light Micro-structural is learned to be alternately arranged.
- 9. biological identification device according to claim 1, it is characterised in that every one first optical microstructures with the light The optical axis in source has height H on parallel direction, and every one first optical microstructures hang down in the optical axis with the light source The ratio H/W with width W, the height H and the width W is less than 0.3 on straight direction.
- 10. biological identification device according to claim 1, it is characterised in that every one first optical microstructures with it is described There is width W on the vertical direction of the optical axis of light source, the multiple first optical microstructures are arranged with spacing P, the width W with The ratio W/P of the spacing P is more than or equal to 0.001 and less than or equal to 1.
- 11. biological identification device according to claim 1, it is characterised in that the second surface of the light-guide device With multiple second optical microstructures, every one second optical microstructures have an at least reflecting surface, and the light beam is by described each An at least reflective surface for second optical microstructures, collimatedly to be passed to the first surface of the light-guide device Pass.
- 12. biological identification device according to claim 11, it is characterised in that it is anti-that an at least reflecting surface includes first Penetrate face and the second reflecting surface, first table of first reflecting surface with second reflecting surface relative to the light-guide device Face tilts, the incline direction of first reflecting surface and second reflecting surface on the contrary, wherein described light beam sequentially by described every First reflecting surface and second reflective surface of one second optical microstructures, with collimatedly to the light-guide device The first surface transmission.
- 13. biological identification device according to claim 11, it is characterised in that an at least reflecting surface includes curved surface, Wherein described light beam is reflected at the difference two of the curved surface, collimatedly to be passed to the first surface of the light-guide device Pass.
- 14. biological identification device according to claim 1, it is characterised in that the second surface of the light-guide device With multiple 3rd optical microstructures, every one the 3rd optical microstructures have reflecting surface, and the biological identification device also includes：Optical element is controlled, between the second surface and described image of the light-guide device obtain element, wherein the light Beam is by the reflective surface of every one the 3rd optical microstructures, with the institute for obliquely transmitting and passing through the light-guide device First surface is stated to thing to be identified, the light beam acted on by thing to be identified is transferred to the control optical element, the control optical element Refraction with reflecting the light beam so that the beam collimation obtain element transmission to described image.
- 15. biological identification device according to claim 14, it is characterised in that the reflecting surface is relative to the guide-lighting member The first surface of part tilts.
- 16. biological identification device according to claim 14, it is characterised in that the reflecting surface is curved surface.
- 17. biological identification device according to claim 14, it is characterised in that the control optical element includes：Multiple microprisms, each microprism have bottom surface and multiple sides, and the multiple side is relative to the light-guide device The first surface tilts, the incline direction of the multiple side on the contrary, the bottom surface is connected between the multiple side, its The middle light beam by the thing effect to be identified is sequentially by a refraction of the multiple side, by the another of the multiple side One reflects and is emitted by the bottom surface.
- 18. biological identification device according to claim 1, it is characterised in that the biological identification device also includes：Collimating element, between the second surface and described image the acquisition element of the light-guide device.
- 19. biological identification device according to claim 1, it is characterised in that the thing to be identified include fingerprint, vein, Palmmprint or its combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720332311.7U CN206657152U (en) | 2017-03-31 | 2017-03-31 | Biological identification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720332311.7U CN206657152U (en) | 2017-03-31 | 2017-03-31 | Biological identification device |
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| CN206657152U true CN206657152U (en) | 2017-11-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108446677A (en) * | 2018-05-03 | 2018-08-24 | 东莞市美光达光学科技有限公司 | A kind of fingerprint recognition module for below screen |
| CN108469704A (en) * | 2018-05-03 | 2018-08-31 | 东莞市美光达光学科技有限公司 | A kind of illuminating module being hidden in below mobile phone screen |
| CN108664857A (en) * | 2017-03-31 | 2018-10-16 | 敦捷光电股份有限公司 | Biological identification device |
| CN110554454A (en) * | 2019-09-29 | 2019-12-10 | 厦门天马微电子有限公司 | Backlight module and display device |
-
2017
- 2017-03-31 CN CN201720332311.7U patent/CN206657152U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108664857A (en) * | 2017-03-31 | 2018-10-16 | 敦捷光电股份有限公司 | Biological identification device |
| CN108664857B (en) * | 2017-03-31 | 2023-01-24 | 敦泰电子有限公司 | Biometric identification device |
| CN108446677A (en) * | 2018-05-03 | 2018-08-24 | 东莞市美光达光学科技有限公司 | A kind of fingerprint recognition module for below screen |
| CN108469704A (en) * | 2018-05-03 | 2018-08-31 | 东莞市美光达光学科技有限公司 | A kind of illuminating module being hidden in below mobile phone screen |
| WO2019210572A1 (en) * | 2018-05-03 | 2019-11-07 | 东莞市美光达光学科技有限公司 | Fingerprint recognition module used below screen |
| CN108469704B (en) * | 2018-05-03 | 2024-05-28 | 东莞市美光达光学科技有限公司 | Hide in light emitting module of cell-phone screen below |
| CN110554454A (en) * | 2019-09-29 | 2019-12-10 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN110554454B (en) * | 2019-09-29 | 2020-07-31 | 厦门天马微电子有限公司 | Backlight module and display device |
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