CN107918982B - Intelligent cash counter - Google Patents
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- CN107918982B CN107918982B CN201711329937.3A CN201711329937A CN107918982B CN 107918982 B CN107918982 B CN 107918982B CN 201711329937 A CN201711329937 A CN 201711329937A CN 107918982 B CN107918982 B CN 107918982B
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- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
- G07F19/20—Automatic teller machines [ATMs]
- G07F19/201—Accessories of ATMs
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Abstract
The invention discloses an intelligent cash counter which comprises a machine body, a face monitoring camera, a touch display screen, an identity card reader, a code keyboard, a bank card reader, a coin inlet, a coin outlet, a paper currency monitoring camera, a magnetic stripe card reader, a loudspeaker, a two-dimensional code scanner, a paper currency inlet, a receipt outlet, a paper currency outlet and a fingerprint identification module, wherein the face monitoring camera is arranged on the machine body; the fingerprint identification module comprises a chip, a substrate, a base ring and a heating plate; the chip is arranged on the substrate and comprises a top surface, a bottom surface and an outer side surface connecting the top surface and the bottom surface; the substrate comprises a connecting surface connected with the bottom surface and a matching surface adjacent to the connecting surface; the outer side surface comprises a plurality of surfaces which are distributed in a step shape; the base ring has a plurality of faces adapted to the outer side face and the mating face; the base ring is bonded with the outer side surface or/and the matching surface through glue; the heating plate is arranged on the top surface. The invention effectively solves the problem that the fingerprint identification module cannot identify when the finger is wet or damp by arranging the heating plate and the fan cover.
Description
Technical Field
The invention relates to the field of bank terminal equipment, in particular to an intelligent cash counter.
Background
An Automatic Teller Machine (ATM) is a small machine arranged at different places of a bank, and a magnetic tape on a credit card-sized adhesive card is used for recording basic account information of a customer, so that the customer can carry out bank counter services such as money withdrawal, deposit, account transfer and the like through the machine.
At present, ATM machines used by various financial network points can only complete auxiliary service functions such as deposit, withdrawal, balance inquiry, account transfer of local bank or different bank, password modification and the like through digital passwords; once the bank card is lost or stolen, the leakage of the password causes economic loss for a bank card holder; therefore, some intelligent cash counters with fingerprint identification function appear in the market at present, and operations such as deposit, withdrawal, balance inquiry, local bank or different bank account transfer and the like can be carried out only under the condition that the password and the fingerprint pass verification at the same time; however, the conventional push type fingerprint identification has the following problems: when a finger is wet or damp, fingerprint identification often cannot pass verification; the reasons for this phenomenon are mainly the following two reasons: 1. the fingerprint identification is realized by capturing the fingerprint of a user, the fingerprint is uneven folds, and if the finger is wet, the folds are filled with water, so that the failure of fingerprint identification is caused; 2. the currently used pressing type fingerprint identification sensor is generally a capacitance type fingerprint acquisition sensor, capacitance touch is related to current, and the current is influenced after a finger is wetted because water is a conductor, so that interference is caused to a fingerprint identification system; in addition, the current noise of the horn is commonly existed in the existing ATM machine during the on-off process. Therefore, if the recognition success rate of the fingerprint recognition module is improved and the current noise emitted by a loudspeaker when the ATM is switched on and switched off is eliminated, the problem to be solved by the technical personnel in the field is urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an intelligent cash counter which effectively solves the problem that a fingerprint identification module cannot identify when a finger is wet or moist.
In order to achieve the purpose, the invention adopts the following technical scheme:
the intelligent cash counter comprises a machine body, a face monitoring camera, a touch display screen, an identity card reader, a password keyboard, a bank card reader, a coin inlet, a coin outlet, a paper currency monitoring camera, a magnetic stripe reader, a loudspeaker, a two-dimensional code scanner, a paper currency inlet, a receipt outlet, a paper currency outlet and a fingerprint identification module;
the fingerprint identification module comprises a chip, a substrate, a base ring and a heating plate; the chip is arranged on the substrate and comprises a top surface, a bottom surface and an outer side surface connecting the top surface and the bottom surface; the bottom surface is attached to the substrate; the substrate comprises a connecting surface connected with the bottom surface and a matching surface adjacent to the connecting surface; the outer side surface comprises a plurality of surfaces which are distributed in a step shape; said base ring having a plurality of faces that mate with said outer side faces and said mating faces; the base ring is bonded with the outer side face or/and the matching face through glue;
the heating plate is arranged on the top surface, and the upper end surface of the heating plate is lower than the upper end surface of the base ring; the heating plate is internally provided with a cavity, the left side and the right side of the cavity and positions close to the left side wall and the right side wall are respectively provided with a filter screen, the two filter screens divide the interior of the heating plate into three chambers, and the left chamber is sequentially connected with a heating module and a blower through a pipeline; an air outlet is arranged on the side wall of the right chamber;
the power amplification circuit of the loudspeaker is connected with a noise reduction circuit; the noise reduction circuit comprises a fourth resistor, a second triode, a fifth resistor, a sixth resistor, a seventh resistor, a third triode, an eighth resistor, a ninth resistor, a tenth resistor and a second capacitor; wherein the content of the first and second substances,
one end of the fourth resistor is connected with the audio control output signal end of the processor of the intelligent cash counter, and the other end of the fourth resistor is connected to the base electrode of the second triode;
an emitter of the second triode is grounded, and a collector of the second triode is respectively connected to one end of the fifth resistor, one end of the sixth resistor, one end of the seventh resistor and one end of the eighth resistor;
the other end of the fifth resistor is connected to an output port of the switching power supply;
the other end of the sixth resistor is grounded;
the other end of the eighth resistor is used as a mute signal output end and is connected to a mute signal input end of the power amplification circuit and one end of the second capacitor;
the other end of the second capacitor is grounded;
the other end of the seventh resistor is connected to the base electrode of the third triode;
an emitting electrode of the third triode is grounded, a collector electrode of the third triode is used as a turn-off signal output end and is connected to a turn-off signal input end of the power amplification circuit, and meanwhile, the collector electrode of the third triode is also respectively connected to one end of the ninth resistor and one end of the tenth resistor;
the other end of the ninth resistor is connected to an output port of the switching power supply;
the other end of the tenth resistor is grounded;
the switching power supply comprises a rectifier bridge, a first adjustable resistor, a second resistor, a first triode, a third resistor, a first capacitor and a voltage regulator tube; wherein the content of the first and second substances,
two terminals in the middle of the rectifier bridge are respectively connected with two terminals of alternating current; a left terminal of the rectifier bridge is grounded, and a right terminal of the rectifier bridge is used as an output port of the switching power supply and is connected with one end of the first adjustable resistor and the cathode of the voltage regulator tube;
the other end of the first adjustable resistor is connected with a collector of the first triode, an emitter of the first triode is grounded, and a base of the first triode is connected with one end of the second resistor;
one end of the second resistor is connected with one end of the third resistor and one end of the first capacitor;
the other end of the third resistor and the other end of the first capacitor are grounded.
Further, a fan cover is arranged on the fingerprint identification module, the section of the fan cover is trapezoidal, the left side, the right side, the upper side and the rear side of the fan cover are closed, and the front side of the fan cover is open; air supply devices are arranged in the cavities of the left side wall and the right side wall of the fan cover, and an air channel is arranged in the upper side wall of the fan cover; the chambers of the left and right side walls of the fan cover are communicated through the air duct; the air supply device is composed of a plurality of air boxes which are sequentially connected, and the air supply device is arranged in parallel with the side wall of the fan cover; the section of the air box is in an inverted right trapezoid shape, an air inlet is formed in the upper end face of the air box, and an air outlet is formed in the inclined end face of the air box; the air inlet is communicated with the cavities on the left side wall and the right side wall of the fan cover, and the air outlet faces the fingerprint identification module; the chamber of the left or right side wall of the fan cover is communicated with the blower through a pipeline; protective nets are arranged on the left side wall and the right side wall in the fan cover.
Further, the thickness of the heating plate is not more than 1 cm.
Further, the heating plate is a transparent glass plate, a transparent resin plate or an acrylic plate.
The invention has the following beneficial technical effects:
according to the invention, by arranging the heating plate and the fan cover, the wet or damp finger to be identified can be quickly dried, so that the problem that the fingerprint identification module cannot identify when the finger is wet or damp is effectively solved.
Drawings
FIG. 1 is a schematic perspective view of an intelligent cash counter according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a fingerprint identification module according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a heating plate according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a fan housing according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of the switching power supply and noise reduction circuit connected to the power amplifier circuit of the horn according to the embodiment of the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1-3, the present invention provides an intelligent cash counter, which includes a machine body 1, a face surveillance camera 2, a touch display screen 3, an identification card reader 4, a password keypad 5, a bank card reader 6, a coin inlet 7, a coin outlet 8, a paper currency surveillance camera 9, a magnetic stripe reader 10, a speaker 11, a two-dimensional code scanner 12, a paper currency inlet 13, a receipt outlet 14, a paper currency outlet 15, and a fingerprint identification module 16; the face monitoring camera 2, the touch display screen 3, the identity card reader 4, the password keyboard 5, the bank card reader 6, the coin inlet 7, the coin outlet 8, the paper currency monitoring camera 9, the magnetic stripe card reader 10, the loudspeaker 11, the two-dimensional code scanner 12, the paper currency inlet 13, the receipt strip outlet 14, the paper currency outlet 15 and the fingerprint identification module 16 are all connected with a processor in the integrated machine control system;
the face monitoring camera 2 is used for acquiring video information of a user and sending the video information to the storage unit for storage through the processor;
the touch display screen 3 is used for providing a man-machine interaction operation interface for a user and displaying user account information;
the identity card reader 4 is used for reading the identity card information of the user;
the password keyboard 5 is used for typing in a user account password;
the bank card reader 6 is used for reading the information of the bank card of the user;
the coin inlet 7 and the coin outlet 8 are respectively used for storing and taking coins;
the paper currency monitoring camera 9 is used for acquiring video information of paper currency accessed by a user and sending the video information to the storage unit for storage through the processor;
the magnetic stripe card reader 10 is used for reading the magnetic stripe information of a user;
the loudspeaker 11 is used for playing voice information to a user;
the two-dimensional code scanner 12 is used for reading two-dimensional code information;
the paper money inlet 13 and the paper money outlet 15 are respectively used for storing and taking paper money;
the voucher outlet 14 is for providing a transaction voucher to the user;
the fingerprint identification module 16 is used for reading fingerprint information of a user;
the fingerprint identification module 16 comprises a chip 17, a substrate 18, a base ring 19 and a heating plate 20; the chip 17 is arranged on the substrate 18, and the chip 17 comprises a top surface, a bottom surface and an outer side surface 21 connecting the top surface and the bottom surface; a bottom surface-mounted substrate 18; the substrate 18 includes a connection surface connected to the bottom surface and a mating surface 22 adjacent to the connection surface; the outer side surface 21 comprises a plurality of surfaces which are distributed in a step shape; the base ring 19 has a plurality of faces 23 adapted to the outer face 21 and the mating face 22; base ring 19 is bonded to outer side 21 or/and mating surface 22 by glue 24 a; in this application, because lateral surface 21 is including being the multiple face of echelonment distribution to when being connected base ring 19 and chip 17 and base plate 18 through glue 24a, can effectively reduce the risk that glue spills over, avoided because glue spills over the influence that causes fingerprint identification module 16's outward appearance.
The heating plate 20 is arranged on the top surface, and the upper end surface of the heating plate 20 is lower than the upper end surface of the base ring 19; the heating plate 20 is internally provided with a cavity, the left side and the right side of the cavity and positions close to the left side wall and the right side wall are respectively provided with a filter screen 23, the two filter screens 23 divide the interior of the heating plate into three chambers, and the left chamber 24 is sequentially connected with a heating module 26 and a blower 27 through a pipeline 25; an air outlet 29 is arranged on the side wall of the right chamber 28; the heating plate 20 is a transparent glass plate, a transparent resin plate, or an acrylic plate. The thickness of the heating plate 20 is not more than 1cm, the recognition rate is affected when the heating plate 20 is too thick, and the heating effect is poor when the heating plate is too thin; the applicant proves through experiments that when the thickness of the heating plate 20 is not more than 1cm, the recognition rate is not affected, and the heating and dehumidifying effects are obvious; preferably, the thickness of the heating plate 20 is 8 mm. The heating module 26 can be a ring-mounted heating device formed by heating resistance wires.
As shown in fig. 4, the fingerprint identification module 16 is provided with a fan housing 30, the cross section of the fan housing 30 is trapezoidal, the left side, the right side, the upper side and the rear side of the fan housing are closed, and the front side is open; air supply devices 31 are arranged in the cavities of the left side wall and the right side wall of the fan cover 30, and an air duct 32 is arranged in the upper side wall of the fan cover 30; the chambers of the left and right side walls of the fan housing 30 are communicated through an air duct 32; the air supply device 31 is composed of a plurality of air boxes 33 which are connected in sequence, and the air supply device 31 is arranged in parallel with the side wall of the wind cover 30; the section of the air box 33 is in an inverted right trapezoid shape, an air inlet 34 is arranged on the upper end face of the air box 33, and an air outlet 35 is arranged on the inclined end face of the air box 33; the air inlet 34 is communicated with the chambers on the left and right side walls of the fan housing 30, and the air outlet 35 faces the fingerprint identification module 16; the chamber of the left or right side wall of the fan cover 30 is communicated with the blower 27 through the pipeline 25; the left and right side walls in the wind shield 30 are provided with protective nets 38.
Since the cross-sectional shape of the air box 33 in the air hood 30 is an inverted right trapezoid, the air flow blown in by the blower 27 has a trajectory as shown by the curve in fig. 4, and impurities such as dust in the air flow can sink into the bottom corner of the air box 33, thereby preventing the impurities such as dust from entering the air hood 30; the arrangement of the protective net 38 can further play a role in filtering, and more importantly, the protective net can prevent the hands of the user from touching the air box 33, so that the protective net has a certain protective effect.
This application has further improved the identification rate of fingerprint identification module 16 through setting up fan housing 30, and hot plate 20 heats the finger, blows to the finger through fan housing 30, and the moisture that evaporates on with the finger is discharged.
As shown in fig. 5, the power amplifier circuit of the horn 11 is connected with a noise reduction circuit; the noise reduction circuit comprises a fourth resistor R4, a second triode Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third triode Q3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a second capacitor C2; wherein the content of the first and second substances,
one end of the fourth resistor R4 is connected with the processor audio control output signal end IN3 of the intelligent cash counter, and the other end is connected to the base electrode of the second triode Q2;
an emitter of the second triode Q2 is grounded, and a collector of the second triode Q2 is connected to one end of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 respectively;
the other end of the fifth resistor R5 is connected to the output port of the switching power supply;
the other end of the sixth resistor R6 is grounded;
the other end of the eighth resistor R8 is connected to the mute signal input end of the power amplifier circuit and one end of the second capacitor C2 as the mute signal output end OUT 2;
the other end of the second capacitor C2 is grounded;
the other end of the seventh resistor R7 is connected to a base Q3 of the third triode;
an emitter of the third triode Q3 is grounded, a collector of the third triode Q3 is used as a turn-off signal output end OUT1 and is connected to a turn-off signal input end of the power amplifier circuit, and a collector of the third triode Q3 is also connected to one end of a ninth resistor R9 and one end of a tenth resistor R10 respectively;
the other end of the ninth resistor R9 is connected to the output port of the switching power supply;
the other end of the tenth resistor R10 is connected to ground.
The noise reduction circuit can eliminate the current noise of the loudspeaker 11 when the cash counter is started by utilizing the power-on time sequence of the intelligent cash counter control system; the specific implementation process is as follows:
at the moment of system startup, because the power amplifier circuit starts up faster, and the processor is not completely started at this moment, i.e. the IN3 signal is not output, the second triode Q2 is cut off, under the action of the voltage dividing resistors R5 and R6, the signal passes through the seventh resistor R7 to turn on the third triode Q3, after the third triode Q3 is turned on, the output of the shutdown signal OUT1 is low level, at the moment of startup, the voltage difference between the two ends of the second capacitor C2 cannot change suddenly, the OUT2 is low level, the signal starts to charge the second capacitor C2 through the eighth resistor R8, when the second capacitor C2 is charged to the high level of the OUT2, the power amplifier OUT2 outputs an effective mute signal, and the shutdown signal OUT1 takes effect at the moment of startup, thus ensuring that the audio frequency remains IN a non-output state despite the invalid mute signal OUT2 at the moment of startup. Under the combined action of the turn-off signal OUT1 and the mute signal OUT2, the audio power amplifier is ensured to be in a mute state, and is in a turn-off state, so that the power consumption is greatly reduced. Therefore, the current noise generated by the audio equipment at the starting moment is effectively and reliably eliminated, and the power consumption is reduced.
When the processor normally operates, the IN3 signal output is ensured to be at a high level (+3.3V) through the GPIO port, the IN3 signal passes through the fourth resistor R4 to turn on the second triode Q2, the collector output of the second triode Q2 is at a low level, the third triode Q3 is turned off, under the action of the voltage dividing resistors R5 and R6, the OUT1 signal output is at a high level (about +6V), the off signal OUT1 is invalid, at this time, the mute signal OUT2 is valid because the voltage difference between the two ends of the second capacitor C2 does not change suddenly, so that the off signal OUT1 is invalid under the premise that the mute signal OUT2 is valid, the current noise generated when the audio power amplifier is switched from mute to play can be effectively eliminated, and then the second capacitor C2 discharges quickly through the eighth resistor R8 and the second triode Q2, so that the mute signal OUT2 changes to a low level quickly. At this time, under the combined action of the off signal OUT1 (high level) and the mute signal OUT2 (low level), the audio power amplifier circuit can normally output. Therefore, current noise generated by the audio equipment when switching from mute to play can be effectively and reliably eliminated, and power consumption is reduced.
When the output of the GPIO port of the processor is at a low level, that is, the IN3 signal is at a low level, the second triode Q2 is turned off, under the action of the voltage-dividing resistors R5 and R6, the third triode Q3 is turned on after the signal passes through the seventh resistor R7, the third triode Q3 is turned on, the off signal OUT1 is at a low level, at the moment of switching, the voltage difference between the two ends of the second capacitor C2 does not change suddenly, the mute signal OUT2 is at a low level, the signal starts to charge the second capacitor C2 through the eighth resistor R8, when the OUT2 is at a high level, the OUT2 outputs an effective mute signal, and because at the moment of power-on, the off signal OUT1 is effective, it is ensured that the audio power amplifier remains IN a non-output state despite that the mute signal OUT2 is invalid at the moment of power-on. Under the combined action of the turn-off signal OUT1 and the mute signal OUT2, the audio power amplifier is ensured to be in a mute state, and is in a turn-off state, so that the power consumption is greatly reduced. Thereby effectively and reliably eliminating current noise generated when the audio equipment is switched from play to mute and reducing power consumption.
When the whole system is powered off, the problem of current noise of shutdown can be solved by utilizing the power-off time sequence of the whole system. The specific implementation process is as follows:
at the moment of system shutdown, because the audio power amplifier circuit is under the effect of a large capacitor (the voltage difference between two ends of the capacitor cannot suddenly change), and the processor stops working at this moment, the GPIO port is IN a suspended state, that is, the IN3 signal is not output, the second triode Q2 is cut off, under the effect of the divider resistors R5 and R6, the signal passes through the seventh resistor R7 and then turns on the third triode Q3, after the third triode Q3 is turned on, the shutdown signal OUT1 is output at a low level, at the moment of shutdown, the voltage difference between two ends of the second capacitor C2 cannot suddenly change, the OUT2 is at a low level, the signal starts to charge the second capacitor C2 through the eighth resistor R8, when the OUT2 is at a high level, the OUT2 also outputs an effective mute signal, and because the shutdown signal OUT1 takes effect at the moment of shutdown, it is ensured that the audio power amplifier circuit is IN spite of the fact that the mute signal OUT2 is invalid at the moment. Under the combined action of the turn-off signal OUT1 and the mute signal OUT2, the audio power amplifier is ensured to be in a mute state, and is enabled to be in a turn-off state at the same time, and the whole system is not completely turned off until the large capacitor of the audio power amplifier circuit is completely discharged. Therefore, current noise generated by the audio equipment at the moment of shutdown is effectively and reliably eliminated, and power consumption is reduced.
The switching power supply comprises a rectifier bridge D1, a first adjustable resistor R1, a second resistor R2, a first triode Q1, a third resistor R3, a first capacitor C1 and a voltage regulator tube D2; wherein the content of the first and second substances,
the two terminals IN the middle of the rectifier bridge D1 are respectively connected with the two terminals IN1 and IN2 of alternating current; the left terminal of the rectifier bridge D1 is grounded, and the right terminal of the rectifier bridge D1 is used as an output port of a switching power supply and is connected with one end of a first adjustable resistor R1 and the cathode of a voltage regulator tube D2;
the other end of the first adjustable resistor R1 is connected with the collector of the first triode Q1, the emitter of the first triode Q1 is grounded, and the base of the first triode Q1 is connected with one end of the second resistor R2;
one end of the second resistor R2 is connected with one end of the third resistor R3 and one end of the first capacitor C1;
the other end of the third resistor R3 and the other end of the first capacitor C1 are grounded.
The above description is only for the purpose of illustrating the present invention, and it should be understood that the present invention is not limited to the above embodiments, and various modifications conforming to the spirit of the present invention are within the scope of the present invention.
Claims (3)
1. The intelligent cash counter comprises a machine body, a face monitoring camera, a touch display screen, an identity card reader, a password keyboard, a bank card reader, a coin inlet, a coin outlet, a paper currency monitoring camera, a magnetic stripe reader, a loudspeaker, a two-dimensional code scanner, a paper currency inlet, a receipt outlet, a paper currency outlet and a fingerprint identification module; it is characterized in that the preparation method is characterized in that,
the fingerprint identification module comprises a chip, a substrate, a base ring and a heating plate; the chip is arranged on the substrate and comprises a top surface, a bottom surface and an outer side surface connecting the top surface and the bottom surface; the bottom surface is attached to the substrate; the substrate comprises a connecting surface connected with the bottom surface and a matching surface adjacent to the connecting surface; the outer side surface comprises a plurality of surfaces which are distributed in a step shape; said base ring having a plurality of faces that mate with said outer side faces and said mating faces; the base ring is bonded with the outer side face or/and the matching face through glue;
the heating plate is arranged on the top surface, and the upper end surface of the heating plate is lower than the upper end surface of the base ring; the heating plate is internally provided with a cavity, the left side and the right side of the cavity and positions close to the left side wall and the right side wall are respectively provided with a filter screen, the two filter screens divide the interior of the heating plate into three chambers, and the left chamber is sequentially connected with a heating module and a blower through a pipeline; an air outlet is arranged on the side wall of the right chamber;
the power amplification circuit of the loudspeaker is connected with a noise reduction circuit; the noise reduction circuit comprises a fourth resistor, a second triode, a fifth resistor, a sixth resistor, a seventh resistor, a third triode, an eighth resistor, a ninth resistor, a tenth resistor and a second capacitor; wherein the content of the first and second substances,
one end of the fourth resistor is connected with the audio control output signal end of the processor of the intelligent cash counter, and the other end of the fourth resistor is connected to the base electrode of the second triode;
an emitter of the second triode is grounded, and a collector of the second triode is respectively connected to one end of the fifth resistor, one end of the sixth resistor, one end of the seventh resistor and one end of the eighth resistor;
the other end of the fifth resistor is connected to an output port of the switching power supply;
the other end of the sixth resistor is grounded;
the other end of the eighth resistor is used as a mute signal output end and is connected to a mute signal input end of the power amplification circuit and one end of the second capacitor;
the other end of the second capacitor is grounded;
the other end of the seventh resistor is connected to the base electrode of the third triode;
an emitting electrode of the third triode is grounded, a collector electrode of the third triode is used as a turn-off signal output end and is connected to a turn-off signal input end of the power amplification circuit, and meanwhile, the collector electrode of the third triode is also respectively connected to one end of the ninth resistor and one end of the tenth resistor;
the other end of the ninth resistor is connected to an output port of the switching power supply;
the other end of the tenth resistor is grounded;
the switching power supply comprises a rectifier bridge, a first adjustable resistor, a second resistor, a first triode, a third resistor, a first capacitor and a voltage regulator tube; wherein the content of the first and second substances,
two terminals in the middle of the rectifier bridge are respectively connected with two terminals of alternating current; a left terminal of the rectifier bridge is grounded, and a right terminal of the rectifier bridge is used as an output port of the switching power supply and is connected with one end of the first adjustable resistor and the cathode of the voltage regulator tube;
the other end of the first adjustable resistor is connected with a collector of the first triode, an emitter of the first triode is grounded, and a base of the first triode is connected with one end of the second resistor;
one end of the second resistor is connected with one end of the third resistor and one end of the first capacitor;
the other end of the third resistor and the other end of the first capacitor are grounded;
the fingerprint identification module is provided with a fan cover, the section of the fan cover is trapezoidal, the left side, the right side, the upper side and the rear side of the fan cover are closed, and the front side of the fan cover is open; air supply devices are arranged in the cavities of the left side wall and the right side wall of the fan cover, and an air channel is arranged in the upper side wall of the fan cover; the chambers of the left and right side walls of the fan cover are communicated through the air duct; the air supply device is composed of a plurality of air boxes which are sequentially connected, and the air supply device is arranged in parallel with the side wall of the fan cover; the section of the air box is in an inverted right trapezoid shape, an air inlet is formed in the upper end face of the air box, and an air outlet is formed in the inclined end face of the air box; the air inlet is communicated with the cavities on the left side wall and the right side wall of the fan cover, and the air outlet faces the fingerprint identification module; the chamber of the left or right side wall of the fan cover is communicated with the blower through a pipeline; protective nets are arranged on the left side wall and the right side wall in the fan cover.
2. The intelligent cash register of claim 1, wherein the thickness of the heating plate is no more than 1 cm.
3. The intelligent cash register of claim 1, wherein the heating plate is a transparent glass plate, a transparent resin plate, or an acrylic plate.
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| CN2255004Y (en) * | 1995-01-05 | 1997-05-28 | 朱玉振 | Cooking fume remover |
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