CN105989321B - Optical imaging module of thin biological identification device - Google Patents
Optical imaging module of thin biological identification device Download PDFInfo
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- CN105989321B CN105989321B CN201510040485.1A CN201510040485A CN105989321B CN 105989321 B CN105989321 B CN 105989321B CN 201510040485 A CN201510040485 A CN 201510040485A CN 105989321 B CN105989321 B CN 105989321B
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Abstract
An optical imaging module of a thinned biological identification device comprises: a first glass substrate, a first optical prism film, a second optical prism film, and an image sensing device. The first glass substrate comprises: a fingerprint image area, a vein image area, a contact surface, a reflection surface and a binding surface. The first optical prism film is attached to the binding surface and is positioned below the fingerprint image area. The second optical prism film is attached under the first optical prism film. The image sensing assembly corresponds to the first glass substrate and is positioned below the binding surface.
Description
Technical Field
The invention relates to an optical imaging module of a thin biological identification device, which is particularly applied to fingerprint and vein scanning to facilitate the next identification step.
Background
In order to enhance security and overcome the shortcomings of the conventional digital identification technologies such as personal password, digital key, hardware key built in smart chip, etc., more and more identification and security systems are now being provided with biometric devices. Fingerprint recognition devices and vein recognition devices are two common examples of biometric devices.
The most important problem of the dual biometric module is still the integration of hardware, the conventional practice is to configure appropriate sensors for different detection targets, and for the dual fingerprint and vein identification module, an image sensor is required to be installed for vein imaging, and an optical prism and the image sensor are required to be used for imaging the fingerprint part (or a capacitive fingerprint sensor is used), which is mainly due to the difference of the optical principles of imaging of the two images, wherein vein images can be observed as long as infrared light penetrates through the finger, but the fingerprint images must pass through the total reflection phenomenon of the optical prism, so that the degree of identification of the peaks and the valleys of the fingerprint can be increased.
Therefore, the viewing angles (optical paths) of the two images are different in terms of volume, and in addition, the configuration of the traditional fingerprint prism causes the module to be large in volume; furthermore, although the use of capacitive fingerprint sensors as mentioned above can achieve the purpose of volume reduction, the following problems arise in subsequent end-user use: (1) the reliability of the assembly is better for the application of the capacitive sensor in one-to-one (personal) use, but the durability of the assembly is tested in one-to-many comparison environment (building entrance guard attendance system). (2) The use of a capacitive fingerprint sensor further results in an increase in the price of the overall module.
Taiwan patent publication No. 201413596 (hereinafter, abbreviated as 596) is a "biometric identification device and method" proposed by the applicant of the present invention, which can solve the aforementioned disadvantages of the conventional dual biometric identification module. However, the 596 protocol still uses conventional rhombuses to achieve the two different sets of optical paths required for the dual biometric modules. The applicant of the present invention further develops and invents an optical imaging module of a thin biometric device, because the conventional prism, i.e., the light guide module, has a large thickness and occupies a large space, is not easy to reduce the overall size, and further has a problem of non-linear deformation of an obtained image due to more than one reflection.
According to the similar fingerprint vein image capturing module on the market, the fingerprint vein image capturing mode of the fingerprint optical imaging module (HS-100) of the manufacturer NEC is to use two image sensors to capture fingerprint and vein images respectively at the same time, and complete fingerprint vein identification by capturing and combining different image sensors and focal segments respectively, so that the time for acquiring and processing images can be reduced, but the cost of the module can be further increased.
Another manufacturer M2SYS has a fingerprint optical imaging module (FUSE-ID), which integrates the optical imaging module and the fingerprint module in hardware, so that the whole module size is 100mm × 120mm × 74mm, the whole volume is large, and the system is two image sensors, which also need to take fingerprint and vein images in sequence, so that the image taking time is relatively long.
In view of the above, the optical imaging module of a thin biometric identification device according to the present invention is configured such that an optical Prism film (Prism Sheet) and a single image sensing element are attached to a glass substrate, such that the overall optical path size is reduced, and a fingerprint and a vein image can be obtained simultaneously by one-time image capture through the single image sensing element, such that the module size required by a conventional Prism is substantially reduced, and the phenomenon of image deformation is reduced due to a smaller deflected optical path, thereby further achieving the purpose of increasing the speed of the system identification processing.
Disclosure of Invention
The first objective of the present invention is to provide an optical imaging module of a thin biometric device, which is formed by attaching an optical prism film to a fingerprint image area on a glass substrate, so as to obtain a fingerprint image and a vein image at the same time by an image sensor assembly.
The second objective of the present invention is to provide an optical imaging module of a thin biometric identification device, which integrates the optical prism film and the glass substrate into an optical imaging module, so as to further reduce the overall optical path volume and speed up the system identification processing.
To achieve the above object, the present invention provides an optical imaging module of a thin biometric device, comprising: a first glass substrate, a first optical prism film, a second optical prism film, and an image sensing device. The first glass substrate comprises: a fingerprint image area, a vein image area, a contact surface, a reflection surface, and a binding surface. The first optical prism film is attached to the binding surface and is positioned below the fingerprint image area. The second optical prism film is attached under the first optical prism film. The image sensing assembly corresponds to the first glass substrate and is positioned below the binding surface.
In another embodiment, the present invention further provides an optical imaging module of a thinned biometric device, comprising: a first glass substrate, a fingerprint image area, a vein image area, a contact surface, a reflection interface and a binding surface; the first optical prism film is attached to the binding surface and is positioned below the fingerprint image area; and two corresponding optical-grade bonding gels are arranged below the first optical prism film.
Drawings
Fig. 1 is a schematic perspective view of an optical imaging module of a thin biometric device disposed in a biometric device according to the present invention.
Fig. 2 is a schematic side view of an optical imaging module of a thin biometric device according to a first preferred embodiment of the invention.
Fig. 3 is a top view of an optical imaging module of a thin biometric device according to a first preferred embodiment of the present invention and a schematic diagram of the image sensor assembly.
FIG. 4 is an enlarged cross-sectional view of a portion of an optical prism film of a first preferred embodiment of an optical imaging module of a thin biometric device according to the present invention.
FIG. 5A is a simulation diagram of the optical path of the first glass substrate attached to the first optical prism film.
FIG. 5B is a simulation diagram of an optical path of the first glass substrate attached to the first optical prism film and then attached to a second glass substrate.
Fig. 5C is an optical path simulation diagram of an optical imaging module of a thin biometric device according to a first preferred embodiment of the invention.
Fig. 6 is a schematic side view of an optical imaging module of a thin biometric device according to a second preferred embodiment of the invention.
Fig. 7 is an optical path simulation diagram of an optical imaging module of a thin biometric device according to a second preferred embodiment of the invention.
Fig. 8 is a schematic side view of an optical imaging module of a thin biometric device according to a third preferred embodiment of the invention.
Fig. 9 is a schematic top view of an optical imaging module of a thin biometric device according to a third preferred embodiment of the invention.
Description of reference numerals: 1. 1a, 1 b-an optical imaging module; 11-a first glass substrate; 111-fingerprint image area; 112-vein image area; 113-contact surface; 114-reflecting surface; 115-binding surface; 12-a first optical prism film; 121-prism microstructures; 13-a second optical prism film; 131-diamond mirror microstructure; 14-image sensing component; 15 to a second glass substrate; 7. 7 b-optical-grade laminating adhesive; 8-finger; 9-a biological identification device; 91-carrying seat; 92-positioning structure; 93 to a light source unit; 94-control module.
Detailed Description
In order to more clearly describe the optical imaging module of the thin type biological identification device, the following description will be provided with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic perspective view illustrating an optical imaging module of a thin biometric device disposed in a biometric device according to the present invention. The optical imaging module 1 of a thin biometric device of the present invention is disposed in a biometric device 9, and the biometric device 9 is used for recognizing a biometric feature, wherein the biometric feature is specifically referred to as "fingerprint" and "vein", and the biometric device 9 includes: a carrier 91, a positioning structure 92, at least one light source unit 93, and a control module 94. In the present invention, the identified part is a finger 8, especially the first and second knuckles of the index finger are preferably part of the finger, and the first knuckle is used as the fingerprint identification, and the second knuckle is mainly used as the vein identification. The finger 8 is pressed on the positioning structure 92 of the holder 91, so that the optical imaging module 1 in the biometric device 9 can further identify the fingerprint and vein features of the finger 8 by the illumination of the light source unit 93, and can be identified by the control module 94.
Referring to fig. 2, 3 and 4, fig. 2 is a schematic side structure view of an optical imaging module of a thin biometric device according to a first preferred embodiment of the present invention. Fig. 3 is a top view of an optical imaging module of a thin biometric device according to a first preferred embodiment of the present invention and a schematic diagram of the image sensor assembly. FIG. 4 is an enlarged cross-sectional view of a portion of an optical prism film of a first preferred embodiment of an optical imaging module of a thin biometric device according to the present invention.
As shown in fig. 2 and 3, an optical imaging module 1 of a thin biometric identification device of the present invention includes: a first glass substrate 11, a first optical prism film 12, a second optical prism film 13, and an image sensor 14. The first glass substrate 11 includes: a fingerprint image area 111, a vein image area 112, a contact surface 113, a reflection surface 114, and an adhesive surface 115. The first optical prism film 12 is attached to the attaching surface 115 and located under the fingerprint image area 111. The second optical prism film 13 is attached under the first optical prism film 12. The image sensor 14 corresponds to the first glass substrate 11 and is located below the bonding surface 115. The contact surface 113 is a surface of the first glass substrate 11 that is provided for a finger (including a fingertip and a front knuckle portion) of a user to contact, and is an upper surface of the first glass substrate 11. According to the different areas of the contact surface 113 contacted by the finger, the contact surface 113 is further divided into two areas, i.e., the fingerprint image area 111 and the vein image area 112, and the reflection surface 114 is located on the other side of the contact surface 113 of the fingerprint image area 111. The bonding surface 115 is the other surface opposite to the contact surface 113, i.e. the lower surface of the first glass substrate 11.
The first glass substrate 11 has functions of filtering visible light, isolating external dust and pressing a fingerprint by a finger, and may be one of an infrared filter (IR pass filter) and colored glass. The first optical Prism film 12 and the second optical Prism film 13 are optical films (Prism sheets) having a micro-Prism structure, by which the deflection direction of light can be changed. The first optical prism film 12 and the second optical prism film 13 are disposed on the upper layer or the lower layer of the first glass substrate 11 during the identification process to form a fingerprint image, but because the first optical prism film 12 and the second optical prism film 13 are made of softer materials, if the first optical prism film 12 and the second optical prism film 13 are disposed on the upper layer of the first glass substrate 11 to directly contact with the finger 8, the finger 8 is easily worn by using the finger, and therefore the first optical prism film 12 and the second optical prism film 13 are mainly disposed below the first glass substrate 11 and can be protected by the first glass substrate 11. However, the first glass substrate 11, the first optical prism film 12, and the second optical prism film 13 are bonded together by an optical-grade adhesive 7; wherein the optical-grade adhesive 7 has a thickness of about 25 μm.
As shown in fig. 4, the first optical prism film 12 and the second optical prism film 13 respectively include a plurality of prism microstructures 121, 131 arranged in an array, and the width D of the pitch (pitch) determines the discrimination degree of the fingerprint image, the larger the width D, the more obvious the light and dark stripes of the fingerprint, but it still needs to be designed according to the minimum resolution of the image sensing device 14, if the width D is too much larger than the minimum resolution of the image sensing device 14, the more obvious prism stripes are easily generated on the image, the height H and the width D show a relation, the ratio is about 1:2(H: D), the height H and the θ 1 further affect the distance of the width D, the θ 1 generally determines whether the light is easy to reach the specific prism surface to generate refraction and total reflection phenomenon on the reflective surface 114, the larger the θ 1 is easy to generate total reflection phenomenon, but the amplitude of the generated total reflection is reduced, the smaller the θ 1 is the total reflection phenomenon, the second optical prism film 13 and the image sensing device 14 have total reflection phenomenon, the smaller the total reflection angle between the refractive index of the second optical prism microstructure 13 and the image sensing device 14 is equal to the total reflection angle of the fingerprint image, the width of the fingerprint image 12, the fingerprint image is equal to 200 μm, the smaller the width D1 is equal to 200 μm, the width D of the fingerprint image sensing device 13 is equal to 200 μm 1, the fingerprint image, the width D is smaller the width 1 is equal to 200 μm of the width D, the width 1 is smaller the width 1 is equal to 200 μm of the width 1 is smaller the fingerprint image sensing device 14.
Referring to fig. 5A, 5B and 5C, fig. 5A is a simulation diagram of an optical path of the first glass substrate attached to the first optical prism film. FIG. 5B is a simulation diagram of an optical path of the first glass substrate attached to the first optical prism film and then attached to a second glass substrate. Fig. 5C is an optical path simulation diagram of an optical imaging module of a thin biometric device according to a first preferred embodiment of the invention. The optical path simulation diagram is actually the opposite state with reference to the view angle of the image sensor 14. Different line types represent light energy of different degrees, the main light (dotted line) represents intensity of 1-0.66, the secondary light (solid line) represents intensity of 0.66-0.33, and the secondary light (double solid line) represents intensity of 0.33-0, which is required to obtain the result that the main light (dotted line) can form total reflection on the reflecting interface 114 of the first glass substrate 11, so as to clearly identify the fingerprint pattern.
As shown in FIG. 5A, the first optical prism film 12 is only attached to the first glass substrate 11, and the optical path simulation result shows that the main light (dotted line) is partially reflected at the reflective surface 114, and the total reflection phenomenon at the reflective surface 114 cannot be effectively generated under the structure of the single layer of the first optical prism film 12. As shown in FIG. 5B, after the first optical prism film 12 is attached to the first glass substrate 11, a second glass substrate 15 is attached, and the main light (dotted line) is refracted and leaves the reflection surface 114, the main light cannot effectively generate total reflection. As shown in fig. 5C, only when the two stacked and bonded first and second optical prism films 12 and 13 are attached to the first glass substrate 11, the main light (dotted line) can generate a complete total reflection phenomenon.
Therefore, the first optical prism film 12 and the second optical prism film 13, which are stacked in two layers, are used as the deflection medium for the light of the fingerprint image area 111 in the first preferred embodiment of the present invention, and then the image sensing component 14 is properly arranged (including the image sensing component with a picture of 16: 9), so as to obtain a total reflection imaging area required by the fingerprint grain between 11 ° and 26 °; that is, as shown in fig. 3, the range of the angle of view θ of the second optical prism film 13 and the image sensor 14 is 11 ° < θ < 26 °, so that the optical paths of the fingerprint image area 111 and the vein image area 112 can be perfectly integrated to achieve the purpose that the fingerprint and the vein are imaged in the same frame.
In other words, the two stacked and bonded layers of the first and second optical prism films 12 and 13 are attached to the side of the fingerprint image area 111 under the bonding surface 115 of the first glass substrate 11, so that the fingerprint image area 111 and the vein image area 112 of the first glass substrate 11 can provide the contact area for fingerprint and vein detection and the finger 8 at the same time. The image sensor 14 is disposed right under the middle of the first glass substrate 11 to capture the fingerprint and vein images at the same time, and thus the fingerprint and vein images can be captured at the same time.
In other preferred embodiments of the present invention described below, most of the components are the same as or similar to the previous embodiments, so the same components and structures will not be described again, and the same components will be directly given the same names and numbers, and the similar components will be given the same names but added with an english letter after the original numbers for distinction and will not be described again, which will be described in advance.
Referring to fig. 6 and 7, fig. 6 is a schematic side structure view of an optical imaging module of a thin biometric device according to a second preferred embodiment of the present invention. Fig. 7 is an optical path simulation diagram of an optical imaging module of a thin biometric device according to a second preferred embodiment of the invention. The second preferred embodiment of the optical imaging module of the thin biometric device of the present invention is different from the first preferred embodiment of fig. 2 and 3 in that, as shown in fig. 6 and 7, the center of the first optical prism film 12 and the second optical prism film 13 of the optical imaging module 1a of the second preferred embodiment of the present invention further includes a second glass substrate 15 sandwiched therebetween. That is, the optical-level adhesive 7 is sandwiched between the first optical prism film 12 and the second optical prism film 13, and the second glass substrate 15 is attached under the first glass substrate 11, so that the main light (dotted line) of the optical path simulation can be totally reflected completely.
Referring to fig. 8 and 9, fig. 8 is a schematic side view of an optical imaging module of a thin biometric device according to a third preferred embodiment of the present invention. Fig. 9 is a schematic top view of an optical imaging module of a thin biometric device according to a third preferred embodiment of the invention. The third preferred embodiment of the optical imaging module of the thin biometric device of the present invention is different from the first preferred embodiment of fig. 2 and 3 in that, as shown in fig. 8 and 9, the second optical prism film 13 of the optical imaging module 1b of the third preferred embodiment of the present invention is attached below the first optical prism film 12 through the two corresponding optical-level adhesive glues 7b, respectively, so as to reduce the loss of light penetrating through each plane.
In summary, the optical imaging module 1 of the thin biometric identification apparatus of the present invention includes: a first glass substrate 11, a first optical prism film 12, a second optical prism film 13, and an image sensor 14. The first glass substrate 11 includes: a fingerprint image area 111, a vein image area 112, a contact surface 113, a reflection surface 114, and an adhesive surface 115. The first optical prism film 12 is attached to the attaching surface 115 and located under the fingerprint image area 111. The second optical prism film 13 is attached under the first optical prism film 12. The image sensor 14 corresponds to the first glass substrate 11 and is located below the bonding surface 115. Therefore, the first glass substrate 11, the first and second optical prism films 12 and 13 are integrated into the optical imaging module 1 of the present invention, so that the fingerprint and vein images can be obtained simultaneously by one-time image capture through the image sensing component 14, thereby further reducing the overall optical path volume and increasing the speed of the overall identification processing.
The above-described embodiments should not be construed as limiting the applicable scope of the present invention, and the scope of the present invention should be defined by the scope encompassed within the technical spirit and equivalent variations thereof defined by the claims of the present invention. Rather, these embodiments are merely illustrative of the principles of the invention, which is not to be limited to the specific embodiments shown and described.
Claims (13)
1. An optical imaging module of a thinned biological identification device, comprising:
a first glass substrate comprising: a fingerprint image area, a vein image area, a contact surface, a reflection surface and a binding surface; wherein, the contact surface is the surface of the first glass substrate contacted by a finger of a user;
the first optical prism film is attached to the binding surface and is positioned below the fingerprint image area;
a second optical prism film located under the first optical prism film; and
an image sensing assembly corresponding to the first glass substrate and located below the bonding surface;
the first optical prism film and the second optical prism film respectively comprise a plurality of prism microstructures which are arranged in an array manner;
the fingerprint image area and the vein image area of the first glass substrate are used for fingerprint detection and vein detection of the finger respectively; the image sensing component is arranged right below the middle of the first glass substrate and simultaneously captures the fingerprint and vein images of the finger; moreover, the imaging range of the visual angle theta of the second optical prism film and the image sensing assembly is more than 11 degrees and less than 26 degrees; the optical paths of the fingerprint image area and the vein image area are integrated, so that the fingerprint and the vein image of the finger are imaged in the same picture of the image sensing assembly.
2. The optical imaging module of claim 1, wherein a second glass substrate is sandwiched between the first optical prism film and the second optical prism film.
3. The optical imaging module of claim 2, wherein the first glass substrate, the second glass substrate, the first optical prism film, and the second optical prism film are bonded together by an optical-grade bonding adhesive.
4. The optical imaging module of claim 1, wherein the first optical prism film and the second optical prism film have a thickness L in a range of 200 μm to 300 μm.
5. The optical imaging module of claim 3, wherein the optical adhesive has a thickness of about 25 μm.
6. The optical imaging module of claim 2, wherein the first glass substrate and the second glass substrate are one of an infrared filter and a colored glass.
7. The optical imaging module of a thin biometric device according to claim 1, wherein the pitch width D of each prism microstructure ranges from 60 μm to 200 μm; the height H of each prism microstructure ranges from 30 micrometers to 100 micrometers; the height H is proportional to the width D, and the ratio of H to D is 1 to 2; the horizontal included angle theta 1 of each diamond mirror microstructure is 45 degrees.
8. An optical imaging module of a thinned biological identification device, comprising:
a first glass substrate comprising: a fingerprint image area, a vein image area, a contact surface, a reflection surface and a binding surface; wherein, the contact surface is the surface of the first glass substrate contacted by a finger of a user;
the first optical prism film is attached to the binding surface and is positioned below the fingerprint image area;
two corresponding optical-grade adhesive glues are used for adhering the second optical prism film to the lower part of the first optical prism film; and
an image sensing assembly corresponding to the first glass substrate and located below the bonding surface;
the first optical prism film and the second optical prism film respectively comprise a plurality of prism microstructures which are arranged in an array manner;
the fingerprint image area and the vein image area of the first glass substrate are used for fingerprint detection and vein detection of the finger respectively; the image sensing component is arranged right below the middle of the first glass substrate and simultaneously captures the fingerprint and vein images of the finger; moreover, the imaging range of the visual angle theta of the second optical prism film and the image sensing assembly is more than 11 degrees and less than 26 degrees; the optical paths of the fingerprint image area and the vein image area are integrated, so that the fingerprint and the vein image of the finger are imaged in the same picture of the image sensing assembly.
9. The optical imaging module of claim 8, wherein the first glass substrate, the first optical prism film, and the second optical prism film are bonded together by an optical-grade bonding adhesive.
10. The optical imaging module of claim 8, wherein the first optical prism film and the second optical prism film have a thickness L in a range of 200 μm to 300 μm.
11. The optical imaging module of claim 9, wherein the optical-grade adhesive has a thickness of 25 μm.
12. The optical imaging module of claim 8, wherein the first glass substrate is one of an infrared filter and a colored glass.
13. The optical imaging module of claim 8, wherein the pitch width D of each prism microstructure ranges from 60 μm to 200 μm; the height H of each prism microstructure ranges from 30 micrometers to 100 micrometers; the height H is proportional to the width D, and the ratio of H to D is 1 to 2; the horizontal included angle theta 1 of each diamond mirror microstructure is 45 degrees.
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| CN108256382A (en) * | 2016-12-28 | 2018-07-06 | 创智能科技股份有限公司 | Optical biologic device for identifying |
| CN108742529B (en) * | 2018-05-29 | 2022-05-17 | 苏州佳世达电通有限公司 | Film for auxiliary detection and vein identification system |
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| US8204283B2 (en) * | 2009-01-16 | 2012-06-19 | Gingy Technology Inc. | Fingerprint input module |
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| CN1234126A (en) * | 1996-05-10 | 1999-11-03 | 数字帕桑那公司 | Fingerprint sensing system using sheet prism |
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