CN204808353U - Fingerprint detector and electronic equipment - Google Patents
Fingerprint detector and electronic equipment Download PDFInfo
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- CN204808353U CN204808353U CN201520320551.6U CN201520320551U CN204808353U CN 204808353 U CN204808353 U CN 204808353U CN 201520320551 U CN201520320551 U CN 201520320551U CN 204808353 U CN204808353 U CN 204808353U
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Abstract
The utility model discloses a fingerprint detector and electronic equipment, this fingerprint detector includes: fingerprint identification module for discernment user's fingerprint, the sensing apparatus contains two conductors at least, and the conductor setting is at fingerprint identification module's edge, detection circuitry is connected with every conductor respectively for detect the capacitance value on the conductor. This conductor is the self -capacitance conductor, when user's finger is close to this conductor, will produce corresponding self -capacitance on this conductor to capacitance value through detecting on the conductor changes, just can detect user's removal and the moving direction of finger on the fingerprint detector, thereby according to the removal of user's finger and the response that moving direction carries out the correspondence.
Description
Technical field
The application relates to electronic technology field, particularly relates to a kind of fingerprint detector and electronic equipment.
Background technology
Along with electronic technology development, various portable electric appts also gets more and more, such as the portable electric appts such as mobile phone, panel computer.
Can this be all a fingerprint detector in current electronic equipment, a fingerprint identification module is provided with in this fingerprint detector, this fingerprint identification module can detect the finger print information of the user of this electronic equipment, thus realize the objects such as unlocked by fingerprint, electronic equipments safety can be made so higher, but the function of current fingerprint detector is comparatively single, and then make the utilization rate of fingerprint detector lower.
Utility model content
The utility model embodiment provides a kind of fingerprint detector and electronic equipment, comparatively single in order to the function solving fingerprint detector current in prior art, and then makes the problem that the utilization rate of fingerprint detector is lower.
Its concrete technical scheme is as follows:
A kind of fingerprint detector, comprising:
Fingerprint identification module, for identifying the fingerprint of user;
Sensor, at least comprises two conductors, and each conductor in described at least two conductors is connected with providing the driving circuit of drive singal respectively, and described at least two conductors are arranged on the edge of described fingerprint identification module;
Testing circuit, is connected with each conductor respectively, for detecting the pending signal on described conductor.
Optionally, described pick-up unit comprises four conductors, and described four conductors surround a rectangle.
Optionally, described testing circuit comprises:
Data selector, is connected with each conductor respectively, for selecting the pending signal that a conductor detects;
Chopper stabilized amplifier, carries out calculation process for the described pending signal exported described data selector, exports the first processing signals;
Demodulator circuit, is connected with described chopper stabilized amplifier, for the first processing signals that chopper stabilized amplifier described in demodulation exports, and exports the second processing signals after demodulation;
Programmable gain amplifier, is connected with described demodulator circuit, carries out gain process, and export the 3rd processing signals for described second processing signals exported described demodulator circuit;
Numeral analog to digital converter, is connected with described programmable gain amplifier, carries out analog-to-digital conversion process, and obtain the 4th processing signals for described 3rd processing signals exported described programmable gain amplifier;
Wave filter, is connected with described digital analog to digital converter, carries out filtering process, and obtain the 5th processing signals for described 4th processing signals exported described digital analog to digital converter.
Optionally, described chopper stabilized amplifier comprises: the first switch, second switch, the 3rd switch, the 4th switch, the first electric capacity, the second electric capacity, first integrator, second integral device, wherein,
One end of described first switch connects the input end of described first integrator, and the other end connects described data selector;
One end of described second switch connects the input end of described second integral device, and the other end connects described data selector;
After described 3rd switch and described first Capacitance parallel connection, two ends are connected respectively to described input end and the output terminal of described first integrator;
After described 4th switch and described second Capacitance parallel connection, two ends are connected respectively to described input end and the output terminal of described second integral device;
Another input termination first power supply of described first integrator, output terminal is connected to demodulator circuit;
Another input termination second source of described second integral device, output terminal is connected to demodulator circuit.
Optionally, described demodulator circuit, specifically for eliminating the DC component in the first processing signals of described chopper stabilized amplifier output, and carrying out demodulation process to the first processing signals eliminating DC component, exporting the second processing signals.
A kind of electronic equipment, this electronic equipment comprises:
Housing;
Processor, is arranged in described housing;
Fingerprint detector, is connected with described processor, and described fingerprint detector is above-mentioned fingerprint detector.
The utility model embodiment provides a kind of fingerprint detector, and this fingerprint detector comprises: fingerprint identification module, for identifying the fingerprint of user; Sensing apparatus, at least comprise two conductors, conductor is arranged on the edge of fingerprint identification module; Testing circuit, is connected with each conductor respectively, for detecting the capacitance on conductor.This conductor is self-capacitance conductor, the finger of user near this conductor time, this conductor will produce corresponding self-capacitance, thus by detecting the capacitance variation on conductor, the movement of the finger that just can detect user on fingerprint detector and moving direction, thus carry out corresponding response according to the movement of the finger of user and moving direction.
In the utility model embodiment, this fingerprint detector not only can realize the detection to fingerprint, can also determine the slide of the finger of user on fingerprint detector by the sensing apparatus on fingerprint detector and testing circuit, namely user's finger is left cunning or right cunning on fingerprint detector.Thus make fingerprint detector can the slide of user's finger, and then improve the functional of fingerprint detection and practicality.
Accompanying drawing explanation
Fig. 1 is one of structural representation of a kind of fingerprint detector in the utility model embodiment;
Fig. 2 is the structural representation of testing circuit in the utility model embodiment;
Fig. 3 is the electrical block diagram of chopper stabilized amplifier in the utility model embodiment;
Fig. 4 is the structural representation two of a kind of fingerprint detector in the utility model embodiment;
Fig. 5 is the structural representation three of a kind of fingerprint detector in the utility model embodiment.
Embodiment
In order to the problem that the function singleness and utilization rate that solve fingerprint detector in prior art are lower, the utility model embodiment provides a kind of fingerprint detector, and this fingerprint detector comprises: fingerprint identification module, for identifying the fingerprint of user; Sensing apparatus, at least comprise two conductors, conductor is arranged on the edge of fingerprint identification module; Testing circuit, is connected with each conductor respectively, for detecting the capacitance on conductor.This conductor is self-capacitance conductor, the finger of user near this conductor time, this conductor will produce corresponding self-capacitance, thus by detecting the capacitance variation on conductor, the movement of the finger that just can detect user on fingerprint detector and moving direction, thus carry out corresponding response according to the movement of the finger of user and moving direction.
The major scheme of the fingerprint detector in the utility model embodiment is described in above-mentioned scheme, below by accompanying drawing and specific embodiment, technical solutions of the utility model are described in detail, be to be understood that, the explanation of concrete technical characteristic in the utility model embodiment and embodiment just to technical solutions of the utility model, instead of limit, when not conflicting, the concrete technical characteristic in the utility model embodiment and embodiment can combine mutually.
Be illustrated in figure 1 the structural representation of a kind of fingerprint detector in the utility model embodiment, this fingerprint detector comprises:
Fingerprint identification module 101, multiple detection sub-unit is contained in fingerprint identification module 101, each detection sub-unit user detects the partial fingerprints information of finger, the array be made up of these detection sub-unit can this fingerprint identification module, thus the fingerprint detection realized user, and then the finger print information of user can be obtained by this fingerprint recognition.
Sensing apparatus 102, this sensing apparatus 102 is made up of at least two conductors, and conductor is arranged on the edge of fingerprint identification module 101.
Testing circuit 103, is connected with each conductor respectively, for detecting the capacitance on described conductor.
In FIG, sensing apparatus 102 contains the first conductor and the second conductor, and the first conductor and the second conductor are self-capacitance conductor.
In the utility model embodiment, in order to realize detecting the capacitance of the first conductor and the second conductor, therefore, the first conductor and the second conductor are all connected to testing circuit 103, this testing circuit 103 is for detecting the capacitance on the first conductor and the second conductor.
Below the principle of work of this fingerprint detector is described in detail.
First, when detecting, real-time detects the capacitance on the first conductor and the second conductor by the testing circuit on this fingerprint detector.
If user is by finger when first conductor on the left side, because the first conductor is self-capacitance conductor, the capacitance therefore on this first conductor will change, and namely, the capacitance on the first conductor will increase.The testing circuit 103 be now connected with the first conductor can detect the change of the capacitance on the first conductor, namely this testing circuit 103 specifically can detect the capacitance on the first conductor, finally go back testing circuit 103 by exporting the capacitance of the first conductor with the form of numerical value, namely characterize the size of the capacitance on the second conductor with numerical value.
Certainly, if the finger of user is on second conductor on the right, capacitance on this second conductor also will change, namely, capacitance on second conductor will increase, the same meeting of testing circuit 103 detects the capacitance on the second conductor, finally characterizes the capacitance size of the second conductor with the form of numerical value.
Then, by the capacitance detected and predetermined threshold value being compared, the electronic equipment having installed this fingerprint detector has determined whether that object is near the first conductor or the second conductor, such as the capacitance detecting on the first conductor is when exceeding predetermined threshold value, then illustrate there is object near the first conductor, now this electronic equipment will carry out corresponding response, if when the capacitance detecting on the second conductor exceedes predetermined threshold value, then illustrate there is object near the second conductor, now this electronic equipment also will carry out corresponding response.
Further, in the utility model embodiment, the slide of user's finger on fingerprint detector can also be realized by the first conductor and the second conductor.Specifically, if when finger is slided to the right by the left side of fingerprint detector by user, user's finger first can near the first conductor, capacitance now on the first conductor will increase, when the finger of user slides to the right gradually, the finger of user will away from the first conductor, and gradually close to the second conductor, capacitance now on the first conductor will reduce, and the capacitance of the second conductor will increase gradually.By the process of little increase, this fingerprint detector, by detecting by the process reduced greatly, the capacitance on the first conductor can determine that user is in the operation carrying out sliding, can determine that the finger of user is slip from left to right according to the capacitance on the second conductor further.
In like manner, the process of sliding for turning left from the right side too, the capacitance process from big to small of the second conductor namely first can be detected, then can detect that the capacitance of the first conductor is from the large process of little change, the change finally by this capacitance just can determine the slide of the finger of this user right-to-left on fingerprint detector.
Further, in order to ensure the detection of testing circuit 103 to the capacitance of the first conductor and the second conductor, therefore as shown in Figure 2, data selector 201 chopper stabilized amplifier 202, demodulator circuit 203, programmable gain amplifier 204, digital analog to digital converter 205, wave filter 206 is contained in this testing circuit 103.
Specifically, data selector 201 is for selecting to export the signal that some conductors detect.Briefly, this data selector 201 is exactly that signal carries out selection output.
Chopper stabilized amplifier 202, for according to the capacitance detected, exports the first processing signals that this capacitance is corresponding.As shown in Figure 3, this chopper stabilized amplifier 202 contains the first switch 301, second switch 302, the 3rd switch 303, the 4th switch 304, first electric capacity 305, second electric capacity 306, first integrator 307, second integral device 308, one end of first switch 301 connects the input end of first integrator 307, other end connection data selector switch 201.
One end of second switch 302 connects the input end of second integral device 308, other end connection data selector switch 201.
After 3rd switch 303 is in parallel with the first electric capacity 305, two ends are connected respectively to input end and the input end of first integrator 307.
After 4th switch 304 is in parallel with the second electric capacity 306, two ends are connected respectively to input end and the output terminal of second integral device 308.
Another input end of first integrator 307 connects the first power supply, and output terminal is connected to demodulator circuit 203.
Another input end of second integral device 308 connects second source, and output terminal is connected to demodulator circuit 203.
When the signal that data selector 201 exports inputs from first integrator 307, first switch 301 and second switch 302 close, 3rd switch 303 and the 4th switch 304 disconnect, second integral device 308 resets, the now output of first integrator 307 is Vint1, and Vint1 here can be obtained by following formula:
Vint1＝Vup+(Vup-Vdw)*Cs/C1
Wherein, Vup characterizes the magnitude of voltage of the first power supply be connected with first integrator 307, and Vdw characterizes the magnitude of voltage of the second source be connected with second integral device 308, and Cs characterizes the capacitance on conductor, and C1 characterizes the integration capacitor value in first integrator 307.
In like manner, when the signal that data selector 201 exports inputs from second integral device 308, first switch 301 and second switch 302 disconnect, 3rd switch 303 and the 4th switch 304 close, first integrator 307 resets, now second integral device 308 is exported and can be obtained by following formula for Vint2, Vint here:
Vint2＝Vdw+(Vdw-Vup)*Cs/C2
Wherein, Vup characterizes the magnitude of voltage of the first power supply be connected with first integrator 307, and Vdw characterizes the magnitude of voltage of the second source be connected with second integral device 308, and Cs characterizes the capacitance on conductor, and C2 characterizes the integration capacitor value on second integral device 308.
Further, in order to improve the noise resisting ability of testing circuit, need Vdw-Vup to maximize, therefore Vup will as far as possible close to supply voltage, and the closely voltage that Vdw will try one's best, ensure that integrator amplifier normally works simultaneously.
By this circuit structure, the Output rusults of chopper stabilized amplifier 202 can be made to be directly proportional to the capacitance on conductor, thus just can determine the change of the capacitance on this conductor by the Output rusults of chopper stabilized amplifier 202.
Because the result finally exported needs the numerical value for characterizing capacitance on conductor, therefore after chopper stabilized amplifier 202 exports the first processing signals corresponding to capacitance, demodulator circuit 203 will receive this first processing signals, and this first processing signals of demodulation, obtain the second processing signals, then the second processing signals is exported to programmable gain amplifier 204, then programmable gain amplifier 204 carries out gain process to the signal that this demodulator circuit exports, namely this signal of amplification at double, thus obtain the 3rd processing signals.
After programmable gain amplifier 204 carries out gain process to this signal, the 3rd processing signals exported will be transferred to digital analog to digital converter 205, and this digital analog to digital converter 205 carries out analog-to-digital conversion process for the 3rd processing signals exported programmable gain amplifier 204.Specifically, because this capacitance last obtains with the form of numerical value, so need the digital signal by programmable gain amplifier 204 exports to be converted to simulating signal, therefore the digital signal through gain process that programmable gain amplifier 204 exports just is converted to simulating signal by this digital analog to digital converter 205.
After digital signal is converted to simulating signal by digital analog converter 205, digital analog converter 205 can by the 4th processing signals, that is: simulating signal, be sent to wave filter 206 to process, this wave filter 206 carries out filtering process for the simulating signal exported digital analog converter 205, that is the simulating signal that digital analog converter 205 exports may not be pure simulating signal, therefore the digital signal filtered out by wave filter 206 in simulating signal is needed, and filter away issuable noise etc., the simulating signal of the last output that can be like this is more accurately complete.
By the description in above-described embodiment, this fingerprint detector not only can realize the detection to fingerprint, can also determine the slide of the finger of user on fingerprint detector by the sensing apparatus 102 on fingerprint detector and testing circuit 103, namely user's finger is left cunning or right cunning on fingerprint detector.Thus make fingerprint detector can the slide of user's finger, and then improve the functional of fingerprint detection and practicality.
Further, in the above-described embodiment, what the sensing apparatus 102 of this fingerprint detector comprised is two conductors, thus ensures that sensing apparatus 102 can detect that user points the operation that horizontally slips on fingerprint detector.
Slide on the four direction of the finger of user on fingerprint detector can be detected to make the sensing apparatus 102 on fingerprint detector, therefore sensing apparatus 102 is except comprising the first conductor and the second conductor, the 3rd conductor and the 4th conductor (as shown in Figure 4) can also be comprised, in the diagram, 3rd conductor and the 4th conductor are all arranged on the edge of fingerprint identification module 101,3rd conductor and the 4th conductor and the first conductor and the second conductor surround a rectangular area, and fingerprint identification module 101 is positioned at this rectangular area.
Can detect that user points left cunning on fingerprint detector and right cunning by the sensing apparatus 102 of the first conductor and the second conductor composition, by the 3rd conductor and the 4th conductor can realize to user finger upper cunning and downslide, certainly, identical with the detection method of the first conductor to the detection of the capacitance of the 3rd conductor and the 4th conductor, just repeat no more herein.
Therefore, the fingerprint detector shown in Fig. 4 can detect that user points slide from left to right, the slide of right-to-left, top-down slide and slide from bottom to top on fingerprint detector.And then ensure that fingerprint detector can detect the slide of all directions of the finger of user on fingerprint detector.
Further, in the utility model embodiment, this fingerprint detector can also be structure as shown in Figure 5, in the structure shown in Fig. 5, sensing apparatus 102 in this fingerprint detector contains 6 conductors, these 6 conductors define positive 6 limit shapes, can be detected the slip of finger on fingerprint detector of user more accurately by the structure on these positive 6 limit shapes, such as finger slides to the lower right corner in the upper left corner of fingerprint detector, just this slide can be detected comparatively accurately by the fingerprint detector shown in Fig. 5.
Certainly, in the utility model embodiment, this fingerprint detector except can being the structure shown in Fig. 4 and Fig. 5, can also be other results, such as be adjusted to by sensing apparatus 102 and comprise 8 conductors, or sensing apparatus 102 is adjusted to the fingerprint detector comprising 10 conductors.Thus this fingerprint detector can be made slide in all directions of the finger of user on fingerprint detector more comprehensively can be detected.
In addition, also it should be noted that, in the utility model embodiment, testing circuit 103 is except the circuit structure that the present embodiment exemplifies, and other circuit structures that can realize identical function are also contained in the scope protected of technical solutions of the utility model.
In sum, in the utility model embodiment, in this fingerprint detector except comprising fingerprint identification module, also comprise the sensing apparatus that can detect the slide of user's finger on fingerprint detector, and the glide direction of the finger of this user can be analyzed by the testing circuit be connected with sensing apparatus comparatively accurately, thus make the electronic equipment that this fingerprint detector is set can carry out corresponding response according to the glide direction of the finger of user comparatively accurately.
Further, in the utility model embodiment, additionally provide a kind of electronic equipment, this electronic equipment contains housing, processor, fingerprint detector, wherein,
Processor is arranged in this housing, and processor is connected with fingerprint detector, and fingerprint detector is herein just above-mentioned fingerprint detector.The concrete structure of this fingerprint detector and realize principle and be described in detail in the above-described embodiment, just no longer unnecessaryly herein repeats.
Although described the preferred embodiment of the application, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (6)
1. a fingerprint detector, is characterized in that, comprising:
Fingerprint identification module, for identifying the fingerprint of user;
Sensor, at least comprises two conductors, and each conductor in described at least two conductors is connected with providing the driving circuit of drive singal respectively, and described at least two conductors are arranged on the edge of described fingerprint identification module;
Testing circuit, is connected with each conductor respectively, for detecting the pending signal on described conductor.
2. fingerprint detector as claimed in claim 1, it is characterized in that, described pick-up unit comprises four conductors, and described four conductors surround a rectangle.
3. fingerprint detector as claimed in claim 1, it is characterized in that, described testing circuit comprises:
Data selector, is connected with each conductor respectively, for selecting the pending signal that a conductor detects;
Chopper stabilized amplifier, carries out calculation process for the described pending signal exported described data selector, exports the first processing signals;
Demodulator circuit, is connected with described chopper stabilized amplifier, for the first processing signals that chopper stabilized amplifier described in demodulation exports, and exports the second processing signals after demodulation;
Programmable gain amplifier, is connected with described demodulator circuit, carries out gain process, and export the 3rd processing signals for described second processing signals exported described demodulator circuit;
Numeral analog to digital converter, is connected with described programmable gain amplifier, carries out analog-to-digital conversion process, and obtain the 4th processing signals for described 3rd processing signals exported described programmable gain amplifier;
Wave filter, is connected with described digital analog to digital converter, carries out filtering process, and obtain the 5th processing signals for described 4th processing signals exported described digital analog to digital converter.
4. fingerprint detector as claimed in claim 3, it is characterized in that, described chopper stabilized amplifier comprises: the first switch, second switch, the 3rd switch, the 4th switch, the first electric capacity, the second electric capacity, first integrator, second integral device, wherein,
One end of described first switch connects the input end of described first integrator, and the other end connects described data selector;
One end of described second switch connects the input end of described second integral device, and the other end connects described data selector;
After described 3rd switch and described first Capacitance parallel connection, two ends are connected respectively to described input end and the output terminal of described first integrator;
After described 4th switch and described second Capacitance parallel connection, two ends are connected respectively to described input end and the output terminal of described second integral device;
Another input termination first power supply of described first integrator, output terminal is connected to demodulator circuit;
Another input termination second source of described second integral device, output terminal is connected to demodulator circuit.
5. fingerprint detector as claimed in claim 3, it is characterized in that, described demodulator circuit, specifically for eliminating the DC component in the first processing signals of described chopper stabilized amplifier output, and demodulation process is carried out to the first processing signals eliminating DC component, export the second processing signals.
6. an electronic equipment, is characterized in that, this electronic equipment comprises:
Housing;
Processor, is arranged in described housing;
Fingerprint detector, is connected with described processor, and described fingerprint detector is the fingerprint detector described in claim arbitrary in claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520320551.6U CN204808353U (en) | 2015-05-18 | 2015-05-18 | Fingerprint detector and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520320551.6U CN204808353U (en) | 2015-05-18 | 2015-05-18 | Fingerprint detector and electronic equipment |
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| CN204808353U true CN204808353U (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520320551.6U Active CN204808353U (en) | 2015-05-18 | 2015-05-18 | Fingerprint detector and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056052A (en) * | 2016-03-25 | 2016-10-26 | 深圳市奔凯安全技术股份有限公司 | Fingerprint collection circuit |
| CN106056051A (en) * | 2016-03-25 | 2016-10-26 | 深圳市奔凯安全技术股份有限公司 | Subarea scanning type fingerprint processing method |
-
2015
- 2015-05-18 CN CN201520320551.6U patent/CN204808353U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056052A (en) * | 2016-03-25 | 2016-10-26 | 深圳市奔凯安全技术股份有限公司 | Fingerprint collection circuit |
| CN106056051A (en) * | 2016-03-25 | 2016-10-26 | 深圳市奔凯安全技术股份有限公司 | Subarea scanning type fingerprint processing method |
| CN106056052B (en) * | 2016-03-25 | 2019-09-17 | 深圳市奔凯安全技术股份有限公司 | A kind of fingerprint collecting circuit |
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