CN211015661U - Optical fingerprint sensing lock - Google Patents
Optical fingerprint sensing lock Download PDFInfo
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- CN211015661U CN211015661U CN202020015823.2U CN202020015823U CN211015661U CN 211015661 U CN211015661 U CN 211015661U CN 202020015823 U CN202020015823 U CN 202020015823U CN 211015661 U CN211015661 U CN 211015661U
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- fingerprint
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- light
- fingerprint sensing
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- 230000003287 optical effect Effects 0.000 title claims abstract description 79
- 238000012795 verification Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model relates to an optical fingerprint response lock, it contains: a housing having a recess; at least one light emitting element disposed in the recess for emitting light; an optical sensing chip arranged in the groove for sensing the light reflected by the finger; and a scattering sheet for homogenizing the light emitted by the light emitting element, so that at least part of the light emitted by the light emitting element reaches the finger and is reflected by the finger after passing through the scattering sheet, wherein the optical fingerprint sensing lock determines whether to unlock according to the image interpretation result of the finger fingerprint.
Description
Technical Field
The utility model relates to an optical fingerprint sensing lock reaches more accurate discernment through the optical structure design of improvement.
Background
Referring to the top view of FIG. 1A and the side view of FIG. 1B, an optical fingerprint sensor lock of the prior art is shown. The optical fingerprint sensing lock 10 of the prior art comprises a housing 11, a transparent layer 12, a light emitting element 13 and an optical sensing chip 14. The housing 11 has a recess 11A for seating the light emitting element 13 and the optical sensing chip 14. In the recess 11A or in the housing 11, there are also provided related circuits and lock control structures, which are not relevant to the emphasis of the present invention and therefore not shown.
When a user places a finger on the transparent layer sheet 12, light emitted from the light emitting element 13 is transmitted through the transparent layer sheet 12 to the finger and reflected to be received by the optical sensing chip 14. The optical sensing chip 14 converts the optical signal into an electronic signal, and a circuit (not shown) at the rear end can interpret the electronic signal to identify whether the fingerprint is a fingerprint previously registered by the user; if so, the lock control mechanism (not shown) will unlock. In the figure, the depth d of the groove 11A is exaggerated, and in practice, is shown shallower than shown, for clarity of showing that light is emitted from the light emitting element 13 to reach the transparent layer sheet 12 and reflected to reach the optical sensing chip 14.
The problems of the prior art are as follows: since the size of the groove 11A is not large, the intensity of the light emitted from the light emitting element 13 is still high after being reflected by a finger, so that the contrast in a bright area is poor, which causes difficulty in image recognition. Furthermore, the structural design of the fingerprint sensing lock is limited such that the light emitting element 13 and the optical sensing chip 14 are both disposed within the recess 11A, rather close to each other and without separation, further worsening this problem.
Therefore, the utility model provides an optical fingerprint sensing lock to solve foretell problem.
SUMMERY OF THE UTILITY MODEL
From one of the viewpoints, the utility model provides an optical fingerprint response lock, it contains: a housing having a recess; at least one light emitting element disposed in the recess for emitting light; an optical sensing chip arranged in the groove for sensing the light reflected by the finger; and a scattering sheet for homogenizing the light emitted by the light emitting element, so that at least part of the light emitted by the light emitting element reaches the finger and is reflected by the finger after passing through the scattering sheet, wherein the optical fingerprint sensing lock determines whether to unlock according to the image interpretation result of the finger fingerprint.
In one embodiment, the scattering sheet includes a hollow region, and a projection of the hollow region includes a light receiving area of the optical sensing chip in a top view direction.
In one embodiment, the diffuser is disposed above the housing.
In one embodiment, the inner edge of the shell extends out of the flange, and the scattering sheet is arranged above the flange.
In an embodiment, the optical fingerprint sensing lock further includes at least one partition wall disposed in the groove for partitioning the light emitting device and the optical sensing chip.
In one embodiment, the optical fingerprint sensing lock comprises at least two light emitting elements with different wavelengths.
In one embodiment, the optical fingerprint sensing lock registers the fingerprint patterns of the at least two different wavelengths when registering the fingerprint of the finger, and the sensed fingerprint patterns must be within the verification tolerance range at both the two different wavelengths before unlocking.
In one embodiment, when the optical fingerprint sensing lock registers a fingerprint, fingerprint distribution patterns of the at least two different wavelengths are registered, and when the optical fingerprint sensing lock determines whether to unlock the fingerprint, the optical fingerprint sensing lock subtracts brightness obtained by the two different wavelengths at each distribution position of the input fingerprint pattern to form a subtracted brightness difference distribution pattern, and the brightness difference distribution pattern must be within a verification tolerance range to unlock the fingerprint.
In one embodiment, when the optical fingerprint sensing lock registers a fingerprint, a brightness difference distribution pattern at each distribution position of the fingerprint pattern formed by brightness differences at two different wavelengths is registered, and when the optical fingerprint sensing lock determines whether to unlock the fingerprint, the brightness difference distribution pattern of the fingerprint pattern input during unlocking is compared with the registered brightness difference distribution pattern, and when the difference between the two is within a verification allowable range, the fingerprint is unlocked.
In one embodiment, the at least one light emitting element is disposed at a side of the scattering sheet, so that a main light path of light emitted by the light emitting element is incident into the scattering sheet from the side.
In one embodiment, the optical fingerprint sensing lock further comprises at least one light guide element for guiding the light emitted by the at least one light emitting element to make the main light path thereof emit into the scattering sheet from the side.
Drawings
Fig. 1A-1B are schematic structural diagrams of an optical fingerprint sensing lock in the prior art.
Fig. 2A-2C are schematic structural diagrams illustrating an optical fingerprint sensing lock according to an embodiment of the present invention.
Fig. 3-4 are schematic structural diagrams of optical fingerprint sensing locks according to two other embodiments of the present invention.
Fig. 5 is a schematic diagram of an optical fingerprint sensing lock according to another embodiment of the present invention.
Fig. 6A-6B are schematic diagrams illustrating an optical fingerprint sensing lock according to another embodiment of the present invention.
Fig. 7 is a schematic diagram of an optical fingerprint sensing lock according to another embodiment of the present invention.
Description of the symbols in the drawings
d depth
10 prior art optical fingerprint sensing lock
11 casing
11A groove
11B flange
12 transparent layer sheet
13,13A,13B light emitting element
13C photoconductive element
14 optical sensing chip
15 diffusion sheet
15A hollow region
16 division wall
20,30,40,50 optical fingerprint induction lock (the utility model)
Detailed Description
The foregoing and other features, aspects and utilities of the present invention will be apparent from the following more particular description of preferred embodiments of the invention when read in conjunction with the accompanying drawings. The drawings in the present disclosure are schematic and are intended to show functional relationships between various structural elements, and the shapes, thicknesses and widths are not drawn to scale.
Referring to fig. 2A-2C, fig. 2A is a top view, fig. 2C is a side view, and fig. 2B is a separate top view of diffuser 15. The optical fingerprint sensor lock 20 of the present invention includes a housing 11, a transparent layer 12, a light emitting element 13 (the number of the icons is only an example), and an optical sensing chip 14. The housing 11 has a recess 11A for seating the light emitting element 13 and the optical sensing chip 14. In the recess 11A or in the housing 11, there are also provided related circuits and lock control structures, which are not relevant to the emphasis of the present invention and therefore not shown. The optical fingerprint sensing lock 20 determines whether to unlock according to the result of the image interpretation of the fingerprint (e.g. whether the fingerprint matches the pre-registered fingerprint).
The utility model discloses an optics formula fingerprint response lock 20 lies in with prior art's optics formula fingerprint response lock 10 difference: the optical fingerprint sensing lock 20 further comprises a scattering sheet 15. The diffuser 15 may be positioned, for example, but not limited to, by extending a flange 11B on the inner edge of the housing 11 for positioning and positioning the diffuser 15. The diffusion sheet 15 has an astigmatism effect, as illustrated in fig. 2C; the light emitted from the light emitting element 13 reaches the finger and is reflected by the finger after passing through the diffusion sheet 15, and the light is dispersed into a plurality of paths after passing through the diffusion sheet 15, and the light intensity of each path is reduced, thereby achieving the effect of uniformization. Therefore, the problem that image identification is difficult due to poor contrast in a bright area in the prior art is solved.
Referring to fig. 2B, in an embodiment, the diffuser 15 has a hollow region 15A. In a preferred embodiment, the size of the hollow region 15A is equal to or slightly larger than the light receiving area of the optical sensing chip 14, and the projection of the hollow region 15A includes the light receiving area of the optical sensing chip 14 in the top view direction. The hollow area 15A is illustrated as a circle, but the present invention is not limited thereto, and the hollow area 15A may have other shapes. The hollow region 15A prevents light reflected by the finger from being scattered to reduce image recognition. However, if the light reflected by the finger is scattered not to excessively lower the image recognition, the hollow region 15A may be omitted.
Please refer to fig. 3 and 4, which illustrate schematic structural diagrams of optical fingerprint sensing locks according to another two embodiments of the present invention. In the embodiment of fig. 3, the diffuser sheet 15 is disposed directly above the housing 11, and the transparent layer sheet 12 is omitted. In the embodiment of fig. 4, the diffusion sheet 15 is again provided on the flange 11B of the housing 11, and the transparent layer sheet 12 is also omitted. These two examples show that: in the present invention, the transparent layer sheet 12 may be omitted.
Furthermore, in the embodiment of fig. 3, it also shows: a separation wall 16 may be disposed between the light emitting element 13 and the optical sensing chip 14 to reduce interference of unreflected light emitted by the light emitting element 13 with the optical sensing chip 14.
Fig. 5 shows a schematic diagram of an optical fingerprint sensing lock 30 according to another embodiment of the present invention. In the embodiment of fig. 5, it is shown that at least two light emitting elements 13A and 13B of different wavelengths are provided in the optical fingerprint sensing lock. For example, the light emitting elements 13A and 13B may be an infrared light emitting element and a white light emitting element, respectively, or light emitting elements with different visible light colors, respectively; in one particular embodiment, light emitting elements 13A and 13B are, for example, light emitting elements of 940nm and 600nm wavelengths, respectively. Fig. 5 shows the light emitting elements 13A and 13B in a staggered arrangement, but this is merely an example, the arrangement of the light emitting elements 13A and 13B is not limited thereto, and may be any regular or irregular arrangement, and the number of the light emitting elements 13A and 13B may also be changed.
At least two light emitting elements 13A and 13B of different wavelengths are provided for the purpose of providing more accurate judgment of fingerprint sensing. When there is only one wavelength of light emitting elements, if a malicious person copies the user's flat fingerprint pattern, it is possible to pass the authentication of the optical fingerprint sensing lock. However, if at least two light emitting elements with different wavelengths are provided, the fingerprint pattern copied by a malicious person must have the same three-dimensional depth as that of the user, so that the fingerprint pattern can be verified by the optical fingerprint sensing lock.
In one embodiment, when a user logs in a fingerprint, the optical fingerprint sensing lock logs in fingerprint patterns corresponding to the light emitting elements 13A and 13B at two different wavelengths, and when the user wants to unlock the optical fingerprint sensing lock with a fingerprint, the fingerprint patterns must be within an allowable range for authentication at two different wavelengths. In another embodiment, the user also registers the fingerprint distribution patterns corresponding to the light emitting devices 13A and 13B at two different wavelengths, and when the user wants to unlock with a fingerprint, the optical fingerprint sensing lock subtracts the brightness obtained by the two different wavelengths at each distribution position of the fingerprint pattern to form a subtracted brightness difference pattern, and the brightness difference pattern must be within the allowable range for verification. In another embodiment, when the optical fingerprint sensing lock registers a fingerprint of a user, a brightness difference distribution pattern at each distribution position of the fingerprint pattern is formed by brightness differences at two different wavelengths, and when the user wants to unlock the fingerprint, the optical fingerprint sensing lock compares the brightness difference distribution pattern when unlocking with the registered brightness difference distribution pattern, and the difference between the brightness difference distribution pattern and the registered brightness difference distribution pattern must be within a verification tolerance range. In this way, more accurate verification can be achieved.
Fig. 6A-6B are schematic diagrams illustrating an optical fingerprint sensing lock 40 according to another embodiment of the present invention, wherein fig. 6A is a top view and fig. 6B is a side view. In the present embodiment, the light emitting element 13 is not disposed at the bottom of the recess 11A, but is disposed at the side of the diffusion sheet 15. With this arrangement, since the main light path is incident into the diffuser 15 from the side as indicated by the arrow, the present embodiment can achieve a more uniform light distribution effect compared to the foregoing embodiments.
Fig. 7 shows a schematic diagram of an optical fingerprint sensing lock 50 according to another embodiment of the present invention. In the present embodiment, the light emitting element 13 is not directly disposed at the side of the diffuser 15, but the light guide element (light guiding) 13C is used to guide the light emitted from the light emitting element 13 to the side of the diffuser 15, so that the main light path is still in the direction shown by the arrow, therefore, the present embodiment can also achieve the effect of more uniform light distribution.
In the embodiments of fig. 6A-6B and 7, in a preferred embodiment, the light emitting element 13 is preferably isolated from the inner space of the recess 11A, so that most of the light emitted from the light emitting element 13 will be emitted to the side of the diffuser sheet 15 from the main light path, and will not be directly or reflected to enter the diffuser sheet 15 from below the diffuser sheet 15. Further, in the embodiment of fig. 7, the light emitting element 13 is not necessarily at the position of the icon, but may be at any position as long as the light irradiated from the main optical path can be guided by the light guiding element 13C.
FIGS. 6A-6B, 7 are variations of the embodiment of FIGS. 2A-2C; it is obvious to a person skilled in the art that the concepts of fig. 6A-6B and fig. 7 can be analogized to the embodiments of fig. 3-5, which also belongs to the scope of the present invention.
The present invention has been described in terms of the preferred embodiment, but the above description is only for the purpose of making the content of the present invention easy to be understood by those skilled in the art, and is not intended to limit the scope of the present invention. Those skilled in the art can devise various equivalent variations within the spirit and scope of the present invention; for example, the diffuser 15 is not limited to being positioned by extending the flange 11B through the inner edge of the housing 11, and other methods such as gluing may be used. The foregoing embodiments are not limited to single applications, but may be combined, such as, but not limited to, combining two embodiments, or replacing a portion of one embodiment with a portion of another embodiment. For example, a partition wall is disposed between the light emitting element 13 and the optical sensing chip 14, which can be applied to the embodiment of fig. 2C or fig. 4. All this can be analogized according to the teaching of the present invention. Accordingly, the scope of the present invention should be considered to cover the foregoing and all equivalent variations.
Claims (10)
1. An optical fingerprint sensing lock, comprising:
a housing having a recess;
at least one light emitting element for emitting light;
an optical sensing chip arranged in the groove for sensing the light reflected by the finger; and
a scattering sheet for homogenizing the light emitted by the light emitting element, so that at least part of the light emitted by the light emitting element reaches the finger and is reflected by the finger after passing through the scattering sheet,
the optical fingerprint sensing lock determines whether to unlock according to the image interpretation result of the finger fingerprint.
2. The optical fingerprint sensing lock of claim 1, wherein the scattering sheet comprises a hollow region, and a projection of the hollow region comprises a light receiving area of the optical sensing chip in a top view direction.
3. The optical fingerprint sensing lock of claim 1, wherein the scattering sheet is disposed above the housing, or a flange extends from an inner edge of the housing, and the scattering sheet is disposed above the flange.
4. The optical fingerprint sensing lock of claim 1, further comprising at least one partition wall disposed in the recess for partitioning the light emitting device and the optical sensing chip.
5. The optical fingerprint sensing lock of claim 1, wherein the optical fingerprint sensing lock comprises at least two light emitting elements with different wavelengths.
6. The optical fingerprint sensing lock of claim 5, wherein when the fingerprint of the finger is registered, the fingerprint patterns of the at least two different wavelengths are registered, and when determining whether to unlock, the fingerprint patterns must be within the range of the verification tolerance at the two different wavelengths.
7. The optical fingerprint sensing lock of claim 5, wherein when the fingerprint of the finger is registered, the fingerprint distribution patterns of the at least two different wavelengths are registered, and when the fingerprint is determined to be unlocked, the optical fingerprint sensing lock subtracts the brightness obtained by the two different wavelengths at each distribution position of the input fingerprint pattern to form a subtracted brightness difference distribution pattern, and the brightness difference distribution pattern must be within the verification tolerance range for unlocking.
8. The optical fingerprint sensing lock as claimed in claim 5, wherein when the fingerprint is registered, the brightness difference distribution pattern of each distribution position of the fingerprint pattern formed by the brightness difference of the two different wavelengths is registered, and when the fingerprint is determined to be unlocked, the brightness difference distribution pattern of the fingerprint pattern inputted when the fingerprint is unlocked is compared with the registered brightness difference distribution pattern, and when the difference between the two patterns is within the allowable range for verification, the fingerprint sensing lock is unlocked.
9. The optical fingerprint sensing lock of claim 1, wherein the at least one light emitting device is disposed at a side of the diffuser plate such that a main light path of light emitted from the light emitting device is incident into the diffuser plate from the side.
10. The optical fingerprint sensing lock of claim 1, further comprising at least one light guide element for guiding the light emitted from the at least one light emitting element such that the main light path is emitted into the diffuser from the side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020015823.2U CN211015661U (en) | 2020-01-03 | 2020-01-03 | Optical fingerprint sensing lock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020015823.2U CN211015661U (en) | 2020-01-03 | 2020-01-03 | Optical fingerprint sensing lock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211015661U true CN211015661U (en) | 2020-07-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020015823.2U Active CN211015661U (en) | 2020-01-03 | 2020-01-03 | Optical fingerprint sensing lock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211015661U (en) |
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2020
- 2020-01-03 CN CN202020015823.2U patent/CN211015661U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200731 Address after: 2nd floor, building 1, 1998 Licheng middle Avenue, Longqiao street, Putian City, Fujian Province Patentee after: Putian Jiemu Technology Co.,Ltd. Address before: Maai Island, Seychelles Patentee before: Seychelles water wood technology Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 351100 705-706, building a, Jiulong community, No. 999, lihuadong Avenue, Xialin street, Chengxiang District, Putian City, Fujian Province Patentee after: Fujian Jiemu Technology Co.,Ltd. Address before: 351100 floor 2, building 1, No. 1998, lichengzhong Avenue, Longqiao street, Putian City, Fujian Province Patentee before: Putian Jiemu Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231101 Address after: Room 308 and Room 309, No. 268 Xiangke Road, China (Shanghai) Pilot Free Trade Zone, Pudong New Area, Shanghai, 201210 Patentee after: Shanghai Jieming Technology Co.,Ltd. Address before: 351100 705-706, building a, Jiulong community, No. 999, lihuadong Avenue, Xialin street, Chengxiang District, Putian City, Fujian Province Patentee before: Fujian Jiemu Technology Co.,Ltd. |