CN207601895U - Magnetic image sensor - Google Patents
Magnetic image sensor Download PDFInfo
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- CN207601895U CN207601895U CN201721692794.8U CN201721692794U CN207601895U CN 207601895 U CN207601895 U CN 207601895U CN 201721692794 U CN201721692794 U CN 201721692794U CN 207601895 U CN207601895 U CN 207601895U
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Abstract
The utility model discloses a kind of magnetic image sensors.Wherein, which includes：Permanent magnet, for generating magnetic field；At least one sense magnetic chip, each sense magnetic chip are respectively positioned in the magnetic field of permanent magnet generation and the magnetic field respectively sensed are converted to electric signal；Signal processing chip is connected at least one sense magnetic chip, for receiving the electric signal of each sense magnetic chip and being sequentially output at least one electric signal for feeling magnetic chip conversion；Signal sampling hold circuit is connected with signal processing chip, and the electric signal for being exported to signal processing chip carries out signal sampling, and signal holding is carried out before the electric signal exported arrives next time to the electric signal that signal processing chip exports every time；Interface module is connected with signal sampling hold circuit, for the electric signal of output signal sampling hold circuit output.The magnetic image sensor signal that the utility model is solved in the relevant technologies exports the technical issues of unstable.
Description
Technical field
The utility model is related to field of image sensors, in particular to a kind of magnetic image sensor.
Background technology
Magnetic information has become a kind of modern anti-fake important means, the magnetic information quilt in the false distinguishings such as bank note, financial document
It is widely used, this just needs magnetic image sensor that can carry out accurately identifying that magnetic images sensor relies on it to magnetic image information
The magnetic induction resistance chip of upper carrying is come the electricity that senses magnetic information and change the magnetic information of sensing under the control of control chip
Signal exports.Magnetic induction electric signal is exported one by one under the switching clock signal control of control chip, due to clock switch
Switching have the time difference and there are switching noise, this will make magnetic image sensor output signal have it is smaller to
Lower fluctuation and upwards fluctuation.The output of different magnetic strength resistance chips is variant inside Magnetic Sensor, so different chips is adjacent
Outlet chamber also has output difference fluctuation, simultaneously because the noise doping on circuit can also make magnetic image sensor defeated in the signal
Go out to generate fluctuation.Magnetic Sensor needs to carry out larger enhanced processing to signal, after bigger amplification on this signal compared with
Small fluctuation can be enlarged into very big fluctuation, and the output interval that signal is accordingly stablized is caused to reduce, can not be had to output signal
Effect sampling, signal can not stablize output.Magnetic image sensor detection magnetic image information is seriously affected, the magnetic image letter scanned in this way
Breath accuracy substantially reduces.
The technical issues of unstable is exported for the magnetic image sensor signal in the relevant technologies, is not yet proposed at present effective
Solution.
Utility model content
The utility model embodiment provides a kind of magnetic image sensor, at least to solve the biography of the magnetic image in the relevant technologies
The technical issues of sensor signal output is unstable.
According to the one side of the utility model embodiment, a kind of magnetic image sensor is provided, the magnetic image sensor
Including：Permanent magnet, for generating magnetic field；At least one sense magnetic chip, each magnetic field felt magnetic chip and be respectively positioned on permanent magnet generation
It is interior and the magnetic field respectively sensed is converted into electric signal；Signal processing chip is connected at least one sense magnetic chip, is used for
It receives the electric signal of each sense magnetic chip and is sequentially output the electric signal of at least one sense magnetic chip conversion；Signal sampling keeps electricity
Road is connected with signal processing chip, and signal sampling is carried out for the electric signal that is exported to signal processing chip, and to signal at
The electric signal that reason chip exports every time carries out signal holding before the electric signal exported arrives next time；Interface module, with letter
Number sampling hold circuit is connected, for the electric signal of output signal sampling hold circuit output.
Further, signal processing chip includes input end of clock, for receiving clock control signal, signal processing chip
For being triggered the electric signal for being sequentially output at least one sense magnetic chip conversion by clock control signal；Signal sampling hold circuit
It is switched including control, control switch is turned on and off for the control by clock control signal, and control signal is adopted when opening
Sample holding circuit carries out signal sampling, signal sampling hold circuit is controlled to carry out signal holding when closed.
Further, signal sampling hold circuit further includes：First operational amplifier, the input terminal of the first operational amplifier
The output terminal of anode and signal processing chip connects, and the input cathode of the first operational amplifier is defeated with the first operational amplifier
Outlet connects, and the output terminal of the first operational amplifier is connect with the first end of control switch, the power end of the first operational amplifier
Connect the first power supply, the ground terminal ground connection of the first operational amplifier；First capacitance, be connected to the first operational amplifier power end and
Between the ground terminal of first operational amplifier；Holding capacitor, the first end of holding capacitor connect with the second end of control switch, protect
Hold capacitance second end ground connection, wherein, control switch for control control switch first end and control switch second end it
Between break-make；Second operational amplifier, the input anode of second operational amplifier and the first end of holding capacitor connect, and second
The input cathode of operational amplifier and the output terminal of second operational amplifier connect, and the output terminal of second operational amplifier is with connecing
Mouth mold block is connected, the power supply termination second source of second operational amplifier, the ground terminal ground connection of second operational amplifier；Second
Capacitance is connected between the power end of second operational amplifier and the ground terminal of second operational amplifier.
Further, which further includes：Metallic plate, be arranged on permanent magnet with it is at least one sense magnetic chip it
Between, for the magnetic field of uniform permanent magnet generation.
Further, which further includes：Framework, permanent magnet and metallic plate are mounted in framework.
Further, which further includes：Circuit board, for carrying at least one sense magnetic chip, at signal
Reason chip and signal sampling hold circuit, circuit board are arranged on the side of framework.
Further, which further includes：Cover sheet is located at the outside of circuit board, for protecting electricity
The circuit and chip carried on the plate of road.
Further, through-hole is provided in framework, interface module sets position corresponding with through-hole on circuit boards.
Further, which further includes：Gasket is supported between circuit board and cover sheet, for making
There are spaces between the circuit and chip and cover sheet that are carried on circuit board.
Further, cover sheet is stainless steel cover board.
In the utility model embodiment, by permanent magnet, for generating magnetic field；At least one sense magnetic chip, it is each to feel
Magnetic chip is respectively positioned in the magnetic field of permanent magnet generation and the magnetic field respectively sensed is converted to electric signal；Signal processing chip,
It is connected at least one sense magnetic chip, for receiving the electric signal of each sense magnetic chip and being sequentially output at least one sense magnetic core
The electric signal of piece conversion；Signal sampling hold circuit is connected with signal processing chip, for what is exported to signal processing chip
Electric signal carries out signal sampling, and arrives it at the electric signal exported next time to the electric signal that signal processing chip exports every time
Preceding progress signal holding；Interface module is connected with signal sampling hold circuit, is exported for output signal sampling hold circuit
Electric signal, solve the technical issues of magnetic image sensor signal output in the relevant technologies is unstable, and then realize energy
Enough stablize the technique effect of the signal of magnetic image sensor output.
Description of the drawings
Attached drawing described herein is used to provide a further understanding of the present invention, and forms the part of the application,
The illustrative embodiments and their description of the utility model are not formed for explaining the utility model to the improper of the utility model
It limits.In the accompanying drawings：
Fig. 1 is the schematic cross-section according to a kind of optional magnetic image sensor of the utility model embodiment；
Fig. 2 is the signal sampling hold circuit according to a kind of optional magnetic image sensor of the utility model embodiment
Schematic diagram；
Fig. 3 is a kind of schematic diagram of the signal sampling waveform of optional magnetic image sensor according to prior art；
Fig. 4 is the schematic diagram of the signal sampling waveform of another optional magnetic image sensor according to prior art；
Fig. 5 is the signal according to a kind of signal sampling waveform of optional magnetic image sensor of the utility model embodiment
Figure；
Fig. 6 is showing according to the signal sampling waveform of the optional magnetic image sensor of another kind of the utility model embodiment
It is intended to.
Specific embodiment
In order to which those skilled in the art is made to more fully understand the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model part, instead of all the embodiments.Based on the reality in the utility model
Apply example, those of ordinary skill in the art's all other embodiments obtained without making creative work all should
When the range for belonging to the utility model protection.
It should be noted that term " first " in the specification and claims of the utility model and above-mentioned attached drawing,
" second " etc. is the object for distinguishing similar, and specific sequence or precedence are described without being used for.It should be appreciated that in this way
The data used can be interchanged in the appropriate case, can be in addition at this so as to the embodiment of the utility model described herein
In diagram or description those other than sequence implement.In addition, term " comprising " and " having " and their any deformation, meaning
Figure is to cover non-exclusive include.
This application provides a kind of embodiments of magnetic image sensor.
Fig. 1 is according to a kind of schematic cross-section of optional magnetic image sensor of the utility model embodiment, such as Fig. 1 institutes
Show, the embodiment provide magnetic image sensor include permanent magnet 2, it is at least one sense magnetic chip 5, signal processing chip 6 and
Unshowned signal sampling hold circuit and interface module in Fig. 1.
Permanent magnet 2 is used to generate magnetic field.Each sense magnetic chip 5 is respectively positioned in the magnetic field of the generation of permanent magnet 2, and by each self-induction
The magnetic field that should be arrived is converted to electric signal.Signal processing chip 6 is connected at least one sense magnetic chip 5, for receiving each sense
The electric signal of magnetic chip 5 is simultaneously sequentially output the electric signal that at least one sense magnetic chip 5 is converted.Signal sampling hold circuit and signal
Processing chip 6 is connected, and the electric signal for being exported to signal processing chip 6 carries out signal sampling, and to signal processing chip 6
The electric signal exported every time carries out signal holding before the electric signal exported arrives next time.Interface module is protected with signal sampling
It holds circuit to be connected, for the electric signal of output signal sampling hold circuit output.
Further, signal processing chip 6 includes input end of clock, for receiving clock control signal, signal processing core
Piece 6, which is used to be triggered by clock control signal, is sequentially output the electric signal that at least one sense magnetic chip 5 is converted；Signal sampling is kept
Circuit includes control and switchs, and control switch is turned on and off for the control by clock control signal, and the control letter when opening
Number sampling hold circuit carries out signal sampling, signal sampling hold circuit is controlled to carry out signal holding when closed.
Specifically, as shown in Fig. 2, signal sampling hold circuit includes control switch S1, control switch S1 receives control letter
Number, and be turned on and off according to control signal control, the control signal that control switch S1 is received is clock control signal.Signal is adopted
Sample holding circuit further includes the first operational amplifier A 1, second operational amplifier A2, the first capacitance C1, holding capacitor C2 and second
Capacitance C3.Wherein, the input anode (+) of the first operational amplifier A 1 and the output of signal processing chip 6 (being not shown in Fig. 2)
End connection, the output terminal output signal SIG1 of signal processing chip 6, the input cathode (-) of the first operational amplifier A 1 and the
The output terminal connection of one operational amplifier A 1, the output terminal of the first operational amplifier A 1 are connect with the first end of control switch S1,
The power supply of first operational amplifier A 1 terminates the first power vd D, the ground terminal ground connection of the first operational amplifier A 1；First capacitance C1
It is connected between the power end of the first operational amplifier A 1 and the ground terminal of the first operational amplifier A 1；The first of holding capacitor C2
The second end with control switch S1 is held to connect, the second end ground connection of holding capacitor C2, wherein, switch S1 is controlled for controlling
Switch the break-make between the first end of S1 and the second end of control switch S1；The input anode (+) of second operational amplifier A2
It is connect with the first end of holding capacitor C2, the input cathode (-) of second operational amplifier A2 is with second operational amplifier A2's
Output terminal connects, and the output terminal of second operational amplifier A2 is connected with interface module, the power end of second operational amplifier A2
Second source is connect, in this embodiment, second source is also VDD, and the ground terminal of second operational amplifier A2 is grounded；Second capacitance
C3 is connected between the power end of second operational amplifier A2 and the ground terminal of second operational amplifier A2.
Fig. 3 be the prior art a kind of magnetic image sensor in signal processing chip signal output waveform schematic diagram, CLK
It is clock control signal, SIG1 is the output signal of signal processing chip.Each (bit) of SIG1 is exported in clock signal control
It is exported one by one under system, signal has defeated during being exported with clock signal between front and rear output bit due to clock switch delay inequality etc.
Go out fluctuation, output is caused to have deviation.
Fig. 4 be the prior art a kind of magnetic image sensor in signal processing chip signal output waveform and by amplification
The waveform of signal later, SIG1 are the signals with output pulsation, and for SIG1 after amplification, fluctuation signal, which is amplified, leads to letter
Number effective sampling interval reduces (sampling interval 1 in such as Fig. 4), even without stable sampling interval (sampling interval in such as Fig. 4
2)。
After the magnetic image sensor provided using the utility model embodiment, SIG1 is passed through into signal sampling hold circuit
It is kept, SIG1 is Magnetic Sensor output signal, and SIG1, which is first connected, to be input to the first operation of signal sampling hold circuit and put
The input terminal of big device A1 is input to the input terminal of second operational amplifier A2, finally by the second operation after sampling switch S1
Amplifier A2 outputs are SIG2, and the waveform of the signal SIG2 of output is as shown in Figure 5.
Wherein, control switch S1 can be closed in the low level of clock control signal CLK, and the electric signal of SIG1 passes through the
One operational amplifier A 1 charges rapidly to holding capacitor C2, and the electric signal of holding capacitor C2 follows SIG1 change in electric, signal
SIG1 is followed to change by sampling output SIG2.Control switch S1 is disconnected in CLK signal high level, at this time the output signal of SIG2
SIG1 signals when control switch S1 is disconnected are maintained at, are always maintained to control when next sampling periods (CLK low levels) opening
S1 is closed to be closed.
Fig. 6 is the signal after SIG2 is amplified, as shown in fig. 6, the fluctuation on signal has been not present, signal is by putting
It will not influence to sample after big.
As an alternative embodiment, the magnetic image sensor further includes metallic plate, be arranged on permanent magnet 2 at least
Between one sense magnetic chip 5, for the magnetic field of uniform permanent magnet 2 generation.
As an alternative embodiment, the magnetic image sensor further includes framework, permanent magnet 2 and metallic plate are mounted on
In framework.
As an alternative embodiment, the magnetic image sensor further includes circuit board, for carrying at least one sense
Magnetic chip 5, signal processing chip 6 and signal sampling hold circuit, circuit board are arranged on the side of framework.
As an alternative embodiment, the magnetic image sensor further includes cover sheet, it is located at the outer of circuit board
Side, the circuit and chip carried in protection circuit plates.
As an alternative embodiment, be provided with through-hole in framework, interface module setting on circuit boards with through-hole
Corresponding position.
As an alternative embodiment, the magnetic image sensor further includes gasket, it is supported on circuit board and protection cap
Between plate, for making between the circuit carried on circuit board and chip and cover sheet, there are spaces.
As an alternative embodiment, cover sheet is stainless steel cover board.
As an alternative embodiment, as shown in Figure 1, the magnetic image sensor that the embodiment provides has included support
The framework 1 of effect, framework is interior to be equipped with permanent magnet 2, and permanent magnet 2 generates a constant magnetic field.There is iron plate in the top of permanent magnet 2
(metallic plate) 3, the inhomogenous magnetic field that iron plate 3 can generate permanent magnet 2 become uniform, and there is circuit board 4 in the top of iron plate 3,
Circuit board 4 mainly realizes basic circuit connection and signal output, and sense magnetic is carried above circuit board 4 and answers resistance chip (sense magnetic
Chip) 5 and signal processing chip 6, sense magnetic chip 5 can be because drawing when detect magnetic information when magnetic information is by feeling above magnetic chip 5
The change in the magnetic field risen and change resistance value, voltage signal can be become by feeling the change of resistance value of magnetic chip 5.Signal processing chip 6 will
Voltage signal is sequentially output output terminal.There is gasket 7 above circuit board 4, there is stainless steel protection cover board 8 in the top of gasket 7, no
Rust steel cover sheet 8 can be to carry chip in protection circuit plates 4.Gasket 7 can be by circuit board 4 with the stainless steel of protective effect
Cover sheet 8 is combined closely, and a space is reserved above magnetic induction resistance chip 5 and signal processing chip 6, plays protection
Chip acts on.Gasket 7 simultaneously plays a supportive role to the cover sheet 8 above it.
The above is only the preferred embodiment of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of the application principle is not departed from, several improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (10)
1. a kind of magnetic image sensor, which is characterized in that including：
Permanent magnet, for generating magnetic field；
At least one sense magnetic chip, it is each to feel magnetic chip and be respectively positioned in the magnetic field that the permanent magnet generates and respectively sense
Magnetic field is converted to electric signal；
Signal processing chip is connected at least one sense magnetic chip, for receiving the electric signal of each sense magnetic chip；
Signal sampling hold circuit is connected with the signal processing chip, for the electricity exported to the signal processing chip
Signal carries out signal sampling and signal is kept；
Interface module is connected with the signal sampling hold circuit, for exporting the signal sampling hold circuit output
Electric signal.
2. magnetic image sensor according to claim 1, which is characterized in that
The signal processing chip includes input end of clock, and for receiving clock control signal, the signal processing chip is used for
The electric signal for being sequentially output at least one sense magnetic chip conversion is triggered by the clock control signal；
The signal sampling hold circuit includes control and switchs, and the control switchs to be controlled by the clock control signal
It is turned on and off, and the signal sampling hold circuit is controlled to carry out signal sampling when opening, control the letter when closed
Number sampling hold circuit carries out signal holding.
3. magnetic image sensor according to claim 2, which is characterized in that the signal sampling hold circuit further includes：
First operational amplifier, the input anode of first operational amplifier connect with the output terminal of the signal processing chip
It connects, the input cathode of first operational amplifier is connect with the output terminal of first operational amplifier, first fortune
The output terminal for calculating amplifier is connect with the first end of the control switch, the first electricity of power supply termination of first operational amplifier
Source, the ground terminal ground connection of first operational amplifier；
First capacitance, be connected to first operational amplifier power end and first operational amplifier ground terminal it
Between；
Holding capacitor, the first end of the holding capacitor are connect with the second end of the control switch, and the of the holding capacitor
Two ends are grounded, wherein, the control switchs the second end of the first end and the control switch for controlling the control switch
Between break-make；
Second operational amplifier, the input anode of the second operational amplifier are connect with the first end of the holding capacitor,
The input cathode of the second operational amplifier is connect with the output terminal of the second operational amplifier, and second operation is put
The output terminal of big device is connected with the interface module, and the power supply of the second operational amplifier terminates second source, and described the
The ground terminal ground connection of two operational amplifiers；
Second capacitance, be connected to the second operational amplifier power end and the second operational amplifier ground terminal it
Between.
4. magnetic image sensor according to claim 1, which is characterized in that the magnetic image sensor further includes：
Metallic plate is arranged between the permanent magnet and at least one sense magnetic chip, is generated for the uniformly permanent magnet
Magnetic field.
5. magnetic image sensor according to claim 4, which is characterized in that the magnetic image sensor further includes：
Framework, the permanent magnet and the metallic plate are mounted in the framework.
6. magnetic image sensor according to claim 5, which is characterized in that the magnetic image sensor further includes：
Circuit board keeps electricity for carrying at least one sense magnetic chip, the signal processing chip and the signal sampling
Road, the circuit board are arranged on the side of the framework.
7. magnetic image sensor according to claim 6, which is characterized in that the magnetic image sensor further includes：
Cover sheet is located at the outside of the circuit board, for protecting the circuit and chip that are carried on the circuit board.
8. magnetic image sensor according to claim 7, which is characterized in that through-hole is provided in the framework, it is described to connect
Mouth mold block is arranged on position corresponding with the through-hole on the circuit board.
9. magnetic image sensor according to claim 7, which is characterized in that the magnetic image sensor further includes：
Gasket is supported between the circuit board and the cover sheet, for making the circuit and core that are carried on the circuit board
There are spaces between piece and the cover sheet.
10. magnetic image sensor according to claim 7, which is characterized in that the cover sheet is stainless steel cover board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721692794.8U CN207601895U (en) | 2017-12-07 | 2017-12-07 | Magnetic image sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721692794.8U CN207601895U (en) | 2017-12-07 | 2017-12-07 | Magnetic image sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207601895U true CN207601895U (en) | 2018-07-10 |
Family
ID=62763757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721692794.8U Active CN207601895U (en) | 2017-12-07 | 2017-12-07 | Magnetic image sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207601895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107993332A (en) * | 2017-12-07 | 2018-05-04 | 威海华菱光电股份有限公司 | Magnetic image sensor |
-
2017
- 2017-12-07 CN CN201721692794.8U patent/CN207601895U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107993332A (en) * | 2017-12-07 | 2018-05-04 | 威海华菱光电股份有限公司 | Magnetic image sensor |
| WO2019109676A1 (en) * | 2017-12-07 | 2019-06-13 | 威海华菱光电股份有限公司 | Magnetic image sensor |
| KR20200087837A (en) * | 2017-12-07 | 2020-07-21 | 웨이하이 화링 옵토-일렉트로닉스 컴퍼니 리미티드 | Magnetic image sensor |
| KR102350471B1 (en) | 2017-12-07 | 2022-01-11 | 웨이하이 화링 옵토-일렉트로닉스 컴퍼니 리미티드 | magnetic image sensor |
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