CN203966139U - A kind of fingerprint acquisition device with light guide plate - Google Patents
A kind of fingerprint acquisition device with light guide plate Download PDFInfo
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- CN203966139U CN203966139U CN201420304873.7U CN201420304873U CN203966139U CN 203966139 U CN203966139 U CN 203966139U CN 201420304873 U CN201420304873 U CN 201420304873U CN 203966139 U CN203966139 U CN 203966139U
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- guide plate
- light guide
- light
- prism
- acquisition device
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Abstract
The utility model discloses a kind of fingerprint acquisition device with light guide plate, it comprises light source, light guide plate and prism, and the light that described light source sends enters prism by light guide plate.The utility model is by adding light guide plate between the prism at fingerprint acquisition device and light source, when not affecting fingerprint collecting, avoided high light direct projection human eye, bring good user to experience, and simple in structure low with production cost, there is good economic and social benefit.The utility model can be widely used in various fingerprint capturers.
Description
Technical field
The utility model relates to optically detecting device, relates in particular to a kind of fingerprint acquisition device.
Background technology
PMMA material: claim again acryl or organic glass, have the high grade of transparency, low price, is easy to the advantages such as machining is the glass equivalent material of usually often using.
Fingerprint acquisition device is a kind of precision electronic device that utilizes people's the different feature of fingerprint tool to carry out identification, and principle of work comprises and gathers fingerprint image, the feature that takes the fingerprint, save data and carry out four functions of fingerprint comparison.Wherein fetching finger mark image is the most most important function of fingerprint capturer.By utilizing the rough line shape of finger print to carry out imaging, we call " ridge " the line shape of protruding conventionally, and the formation of sunk line is called " valley ", and the process of fingerprint collecting is the process of fingerprint imaging in essence.
In prior art, the principle of fingerprint collecting normally adopts light source (being generally LED lamp) to see through prism and is irradiated to finger contact face, light is radiated on the rough fingerprint of finger and reflects corresponding line shape, then by sensor devices, collects the line shape picture signal of fingerprint.Yet in fingerprint acquisition device of the prior art, because light source direct irradiation is on prism, user's eyes in use can feel dazzling, user's experience is bad.
Utility model content
In order to solve the problems of the technologies described above, the purpose of this utility model is to provide a kind of light fingerprint acquisition device not dazzling, that simple in structure and experience is good.
The technical scheme that the utility model adopts is:
With a fingerprint acquisition device for light guide plate, it comprises light source, light guide plate and prism, and the light that described light source sends enters prism by light guide plate.
Preferably, described prism is Dove prism, and described Dove prism comprises the prism plane of incidence, finger placed side and prism exit facet; Described light guide plate is Wedge shape light conduction board, and described Wedge shape light conduction board comprises the leaded light plane of incidence, reflecting surface and leaded light exit facet, the described leaded light plane of incidence and light source docking, described leaded light exit facet and the docking of the prism plane of incidence.
Preferably, described light guide plate is the semi-transparent light guide plate of frosted, the reflecting surface of the reflecting surface of described light guide plate for processing through shining line.
Preferably, described light guide plate adopts PMMA material to make.
Preferably, it also comprises pcb board, and described light source is arranged on pcb board, is also provided with sensor devices on described pcb board, and the lower zone of the top of described sensor devices, the exit facet of prism is placed with for collecting the lens of light.
Preferably, between described lens and sensor devices, be provided with the cover glass of printing opacity.
Preferably, described sensor devices is CMOS sensor devices.
Preferably, described light source is LED lamp.
The beneficial effects of the utility model are:
The utility model is by adding light guide plate between the prism at fingerprint acquisition device and light source, when not affecting fingerprint collecting, avoided high light direct projection human eye, bring good user to experience, and simple in structure low with production cost, there is good economic and social benefit.
In addition, the utility model by light guide plate and prism cleverly structure and position relationship design, realize the optimal path of light transmition; By adopting the semi-transparent light guide plate of frosted, make light in light guide plate inscattering, not direct projection human eye; By the solarization line to light guide plate reflecting surface, process, make light can fully pass through light guide plate; By adopting the light transmission of PMMA Material reinforcement light guide plate; By cover glass protection sensor devices is set under lens.
The utility model can be widely used in various fingerprint capturers.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
Fig. 1 is the structural representation of a kind of embodiment of the utility model;
Fig. 2 is the structural representation side view of a kind of embodiment of the utility model.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
As depicted in figs. 1 and 2, a kind of fingerprint acquisition device with light guide plate 20, it comprises light source 10, light guide plate 20 and prism 30, the light 80 that described light source 10 sends enters prism 30 by light guide plate 20.Described prism 30 is Dove prism 30, and described Dove prism 30 comprises the prism plane of incidence 31, finger placed side 32 and prism exit facet 33; Described light guide plate 20 is Wedge shape light conduction board 20, and described Wedge shape light conduction board 20 comprises the leaded light plane of incidence 21, reflecting surface 22 and leaded light exit facet 23, the described leaded light plane of incidence 21 and light source 10 docking, described leaded light exit facet 23 and 31 docking of the prism plane of incidence.Docking described here can be the docking of contact, can be also contactless, be only near docking.Described light guide plate 20 is the semi-transparent light guide plate 20 of frosted, the reflecting surface 22 of the reflecting surface 22 of described light guide plate 20 for processing through shining line.Light 80 is through semi-transparent light guide plate 20 scatterings of frosted, and light 80 can produce reflection through shining the reflecting surface 22 of line processing.Described light guide plate 20 adopts PMMA material to make.PMMA material has high light transmittance, advantage cheaply.(in figure, light 80 parts are not shown)
Wherein, when light 80 that light source 10 sends enters after light guide plate 20 by the leaded light plane of incidence 21, in the interior generation scattering of light guide plate 20, the light of scattering arrives most of generation of reflecting surface 22 and reflects, therefore most of light 80 can only penetrate from leaded light exit facet 23, and then enter prism 30 by the prism plane of incidence 31, arrive finger placed side 32.When not finger does not block, light 80 penetrates from finger placed side 32, and because light 80 becomes soft after the scattering of light guide plate 20 is processed, so user can not feel dazzling while looking at straight; When having finger to block, light 80 penetrates through the prism exit facet 33 that reflexes to of finger print.
Preferably, it also comprises pcb board 40, and described light source 10 is arranged on pcb board 40, on described pcb board 40, is also provided with sensor devices 50, and the lower zone of the exit facet of the top of described sensor devices 50, prism 30 is placed with for collecting the lens 60 of light 80.
Preferably, between described lens 60 and sensor devices 50, be provided with the cover glass 70 of printing opacity.Cover glass 70 is for the protection of sensor devices 50.
Wherein, the light 80 that prism exit facet 33 penetrates gathers through lens 60, through cover glass 70 transmissions, enters sensor devices 50.
Preferably, described sensor devices 50 is CMOS sensor devices 50.It is low that CMOS sensor devices 50 has cost, advantage low in energy consumption.
Preferably, described light source 10 is LED lamp.Can be one or more LED lamps.Adopt LED light fixture to have the advantage that cost is low, the life-span is long.
The utility model is by adding light guide plate 20 between the prism 30 at fingerprint acquisition device and light source 10, when not affecting fingerprint collecting, avoided high light direct projection human eye, bring good user to experience, and simple in structure low with production cost, there is good economic and social benefit.
More than that better enforcement of the present utility model is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to the utility model spirit, and the distortion that these are equal to or replacement are all included in the application's claim limited range.
Claims (7)
1. with a fingerprint acquisition device for light guide plate, it is characterized in that: it comprises light source, light guide plate and prism, the light that described light source sends enters prism by light guide plate; Described prism is Dove prism, and described Dove prism comprises the prism plane of incidence, finger placed side and prism exit facet; Described light guide plate is Wedge shape light conduction board, and described Wedge shape light conduction board comprises the leaded light plane of incidence, reflecting surface and leaded light exit facet, the described leaded light plane of incidence and light source docking, described leaded light exit facet and the docking of the prism plane of incidence.
2. a kind of fingerprint acquisition device with light guide plate according to claim 1, is characterized in that: described light guide plate is the semi-transparent light guide plate of frosted, the reflecting surface of the reflecting surface of described light guide plate for processing through shining line.
3. a kind of fingerprint acquisition device with light guide plate according to claim 2, is characterized in that: described light guide plate adopts PMMA material to make.
4. a kind of fingerprint acquisition device with light guide plate according to claim 3, it is characterized in that: it also comprises pcb board, described light source is arranged on pcb board, on described pcb board, be also provided with sensor devices, the lower zone of the top of described sensor devices, the exit facet of prism is placed with for collecting the lens of light.
5. a kind of fingerprint acquisition device with light guide plate according to claim 4, is characterized in that: the cover glass that is provided with printing opacity between described lens and sensor devices.
6. a kind of fingerprint acquisition device with light guide plate according to claim 4, is characterized in that: described sensor devices is CMOS sensor devices.
7. according to a kind of fingerprint acquisition device with light guide plate described in claim 1 to 6 any one, it is characterized in that: described light source is LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420304873.7U CN203966139U (en) | 2014-06-09 | 2014-06-09 | A kind of fingerprint acquisition device with light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420304873.7U CN203966139U (en) | 2014-06-09 | 2014-06-09 | A kind of fingerprint acquisition device with light guide plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203966139U true CN203966139U (en) | 2014-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420304873.7U Expired - Fee Related CN203966139U (en) | 2014-06-09 | 2014-06-09 | A kind of fingerprint acquisition device with light guide plate |
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| Country | Link |
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| CN (1) | CN203966139U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108304751A (en) * | 2017-01-13 | 2018-07-20 | 致伸科技股份有限公司 | Identification of fingerprint module with instruction function |
-
2014
- 2014-06-09 CN CN201420304873.7U patent/CN203966139U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108304751A (en) * | 2017-01-13 | 2018-07-20 | 致伸科技股份有限公司 | Identification of fingerprint module with instruction function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180404 Address after: 518000 Guangdong, Shenzhen City, Guangdong Province, Longhua District, Longhua District, Longhua street, Qing Hu, Qing Hu Industrial City factory building, 3 building B District Patentee after: SHENZHEN KERUIQI SCIENCE & TECHNOLOGY CO., LTD. Address before: 518000 Guangdong city of Shenzhen province Baoan District Fuyong baishixia Xintang Industrial Park building B8 3F Patentee before: Zhou Bo |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20200609 |