CN202956773U - Optical path system of optical fingerprint sensor - Google Patents
Optical path system of optical fingerprint sensor Download PDFInfo
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- CN202956773U CN202956773U CN 201220582738 CN201220582738U CN202956773U CN 202956773 U CN202956773 U CN 202956773U CN 201220582738 CN201220582738 CN 201220582738 CN 201220582738 U CN201220582738 U CN 201220582738U CN 202956773 U CN202956773 U CN 202956773U
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- optical
- fingerprint sensor
- path system
- prism
- image inductor
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Abstract
The utility model relates to a fingerprint sensor, especially to an optical path system of an optical fingerprint sensor. The optical path system comprises a prism, a light source, a lens group and an image inductor, wherein the prism, the lens group and the image inductor are arranged in order along an optical path, and a band-pass optical filter is arranged in the optical path between the prism and the image inductor. Due to the band-pass optical filter added to the optical path system, only lights emitted by the light source can pass the band-pass optical filters, thereby preventing external lights from entering into the image inductor, avoiding influences of the external lights on finger imaging, and improving precision of fingerprint acquisition to a large extent.
Description
Technical field
The utility model relates to a kind of fingerprint sensor, relates in particular to a kind of optical fingerprint sensor light path system.
Background technology
Optical fingerprint sensor based on optical imaging concept is widely used in current fingerprint recognition system, and it has utilized the total reflection law of light that the rough texture of fingerprint is imaged as to light and dark striped.The light path system of traditional optical fingerprint sensor is subject to the impact of extraneous light, and fingerprint imaging is unintelligible, and the fingerprint recognition rate is low, often causes the fingerprint collecting failure.
Chinese patent CN102682288A discloses a kind of optical finger print system, comprises shell, prism, object lens, lens combination, catoptron and imageing sensor.Shell has accommodation space, and has an opening.Prism is positioned at a side of shell, has incidence surface, collection face and exiting surface.Object lens are adjacent to the exiting surface setting of prism.Lens combination is arranged in shell the opposite side that deviates from prism, have a plane and a convex surface, and the optical axis of lens combination is positioned on vertical direction.Catoptron and horizontal direction form an acute angle, and towards the plane layout of lens combination.The optical axis setting of image sensor alignment lens combination, and imageing sensor is towards the convex surface of lens combination.The shortcoming of this optical finger print system is that light path system is subject to the impact of extraneous light, and fingerprint imaging is unintelligible.
The utility model content
In order to overcome above-mentioned technological deficiency, this use is novel has proposed a kind of light fingerprint sensor light path system that can avoid the external light influence fingerprint collecting.
In order to arrive above-mentioned purpose, the technical solution of the utility model is: a kind of optical fingerprint sensor light path system, comprise prism, light source, lens combination and image inductor, described prism, lens combination and image inductor are arranged in order along light path, and described prism also is provided with bandpass filter in the light path between image inductor.
Preferably, described optical filter is arranged between lens combination and imageing sensor, and the optical filter vertical optical path arranges.
Preferably, be limited to 0.8～1.0 times of optical source wavelength scope lower limit under the logical scope of described bandpass filter band, be limited to 1.0～1.2 times of optical source wavelength range limit on the logical scope of bandpass filter band.
The beneficial effects of the utility model are: owing to having increased band in light path system, lead to the bandpass filter that scope comprises and approach the optical source wavelength scope, the luminous energy that only has light source to send is by this optical filter, prevent that extraneous light from entering image inductor, avoid extraneous light to impact fingerprint imaging, improved to a great extent the precision of fingerprint collecting.
The accompanying drawing explanation
Fig. 1 is the structural representation of the utility model optical fingerprint sensor light path system;
Fig. 2 is light source relative brightness and the wavelength relationship curve map of embodiment 1;
Fig. 3 is embodiment 1 optical filter transmitance and wavelength relationship curve map;
Fig. 4 is light source relative brightness and the wavelength relationship curve map of embodiment 2;
Fig. 5 is embodiment 2 optical filter transmitances and wavelength relationship curve map.
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Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Embodiment 1
Optical fingerprint sensor light path system as shown in Figure 1, comprise prism 1, light source 2, lens combination 3 and image inductor 4, described prism 1, lens combination 3 and image inductor 4 are arranged in order along light path, described prism 1 also is provided with bandpass filter 5 in the light path between image inductor 4, and the optical filter 5 in the present embodiment is located between lens combination 3 and imageing sensor 4.Be limited to 0.8～1.0 times of optical source wavelength scope lower limit under the logical scope of described bandpass filter 5 band, be limited to 1.0～1.2 times of optical source wavelength range limit on the logical scope of bandpass filter band.
Fig. 2 is relative brightness and the wavelength relationship curve map of light source, and in the present embodiment, light source 2 adopts the blue led light source of wavelength coverage at 430～490nm, and wavelength is that the 460nm relative brightness reaches maximal value.Fig. 3 is the graph of relation of light transmittance of optical filter and wavelength, and the logical scope of described bandpass filter 5 band is at 410～510nm, and centre wavelength is 460nm, the peak transmittance of centre wavelength>80%, passband half-width 50nm, cut-off region transmitance<1%.The well interference of the extraneous light of filtering to fingerprint imaging of this optical filter 5, the light that only has light source to send can see through optical filter and be received by image inductor.The optical filter cooperation that can also select the light source of other wavelength in actual use and have the logical scope of identical band, can reach the effect that extraneous light disturbs of eliminating equally.
Embodiment 2
As shown in Figure 4,5, described light source 2 adopts the red LED light source of wavelength coverage at 630～650nm, wavelength is that the 640nm relative brightness reaches maximal value, the logical scope of the band of bandpass filter 5 is at 620～660nm, centre wavelength is 640nm, the peak transmittance of centre wavelength>80%, bandpass half-width degree 20nm, cut-off region transmitance<1%.Do not state part in this embodiment identical with embodiment 1, do not repeating.
Claims (3)
1. an optical fingerprint sensor light path system, comprise prism, light source, lens combination and image inductor, described prism, lens combination and image inductor are arranged in order along light path, it is characterized in that, described prism also is provided with bandpass filter in the light path between image inductor.
2. optical fingerprint sensor light path system according to claim 1, is characterized in that, described bandpass filter is arranged between lens combination and imageing sensor, and the optical filter vertical optical path arranges.
3. optical fingerprint sensor light path system according to claim 1, it is characterized in that, be limited to 0.8～1.0 times of optical source wavelength scope lower limit under the logical scope of bandpass filter band, be limited to 1.0～1.2 times of optical source wavelength range limit on the logical scope of bandpass filter band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220582738 CN202956773U (en) | 2012-11-07 | 2012-11-07 | Optical path system of optical fingerprint sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220582738 CN202956773U (en) | 2012-11-07 | 2012-11-07 | Optical path system of optical fingerprint sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202956773U true CN202956773U (en) | 2013-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220582738 Expired - Lifetime CN202956773U (en) | 2012-11-07 | 2012-11-07 | Optical path system of optical fingerprint sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202956773U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108875622A (en) * | 2018-06-08 | 2018-11-23 | 维沃移动通信有限公司 | A kind of optical finger print recognizer component and terminal |
-
2012
- 2012-11-07 CN CN 201220582738 patent/CN202956773U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108875622A (en) * | 2018-06-08 | 2018-11-23 | 维沃移动通信有限公司 | A kind of optical finger print recognizer component and terminal |
| WO2019233332A1 (en) * | 2018-06-08 | 2019-12-12 | 维沃移动通信有限公司 | Optical fingerprint recognition assembly and terminal |
| JP2021525432A (en) * | 2018-06-08 | 2021-09-24 | 維沃移動通信有限公司Ｖｉｖｏ Ｍｏｂｉｌｅ Ｃｏｍｍｕｎｉｃａｔｉｏｎ Ｃｏ．， Ｌｔｄ． | Optical fingerprint recognition components and terminals |
| US11430251B2 (en) | 2018-06-08 | 2022-08-30 | Vivo Mobile Communication Co., Ltd. | Optical fingerprint identification assembly and terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130529 |