JP2004102431A - Ic card reader/writer with fingerprint authentication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an IC card reader/writer with fingerprint authentication with which reliability is raised, and power is saved. <P>SOLUTION: The reader/writer includes a shutter 14 for opening/closing a fingerprint sensor 20; slide means 16, 17 for sliding the shutter 14 to closing and opening positions, in response to the insertion/ejection state of an IC card 15; detecting means 18, 19 for detecting the opening/closing state of the shutter 14; and a power source circuit for feeding power to circuit parts, in response to the detecting signals. The shutter 14 is located at the closing position to cover the fingerprint sensor 20 in the ejection state of the IC card 15, and is located at the opening position, to expose the fingerprint sensor 20 in the insertion state of the IC card 15. The power source circuit selects a normal fingerprint collation mode, when the shutter is opened, so as to feed power to the whole circuit parts, and selects power-saving mode, when the shutter is closed, so as to inhibit power feeding to normal use circuits. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an IC card reader / writer device with fingerprint authentication, and more particularly to an IC card reader / writer device with fingerprint authentication that improves reliability and realizes power saving.
[0002]
[Prior art]
FIG. 7 is a perspective view showing a conventional IC card reader / writer with fingerprint authentication described in, for example, JP-A-2001-143045.
7, reference numeral 11 denotes an outer case, 12A denotes a finger rest window formed on the upper surface of the outer case 11, 12 denotes a finger rest portion provided in the finger rest window 12A, and 13 denotes a slit on the side end surface of the outer case 11. This is an IC card insertion opening formed in the IC card.
[0003]
An IC card (not shown) unique to each user is removably inserted into the IC card insertion slot 13.
The finger placement unit 12 includes an upper surface exposed portion of a fingerprint sensor (described later), and reads fingerprint information when a user's finger is placed.
[0004]
Further, various electronic circuits (not shown) related to the finger rest portion 12 and the IC card insertion slot 13 are built in the outer case 11, so that the fingerprint information and the IC card information are determined. ing.
[0005]
That is, in the external case 11, reader / writer means for exchanging card information with the IC card in a state where the IC card is inserted into the IC card insertion slot 13, and a circuit unit for processing card information and fingerprint information (To be described later) and a power supply circuit (to be described later) for supplying power to the circuit unit are provided.
[0006]
However, as shown in FIG. 7, in the conventional IC card reader / writer with fingerprint authentication, the finger rest part 12, which requires the highest reliability, is always exposed to the outside, so that there is a possibility that the finger rest part 12 may be damaged.
[0007]
FIG. 8 is a block diagram showing a circuit configuration in the conventional IC card reader / writer with fingerprint authentication shown in FIG. 7, in which an IC card information authentication circuit is omitted.
FIG. 8 shows fingerprint authentication circuit units 20 to 30 and power supply circuit units 31 and 32 corresponding to finger rest unit 12.
[0008]
In FIG. 8, reference numeral 20 denotes a fingerprint sensor disposed on the finger rest unit 12, reference numeral 21 denotes an image capturing circuit for capturing an image detected by the fingerprint sensor 20, and reference numeral 22 denotes a temporary sensor image 21 a via the image capturing circuit 21. This is a temporary frame that is temporarily stored.
[0009]
Reference numeral 23 denotes a calibration circuit inserted in a feedback loop from the temporary frame 22 to the fingerprint sensor 20, and generates a sensitivity adjustment signal 23a for the fingerprint sensor 20 based on the input image 22a in the temporary frame 22.
[0010]
Reference numeral 24 denotes a background image acquisition circuit that acquires a background image from the input image 22a in the temporary frame 22, and reference numeral 25 denotes a background image frame that stores the background image acquired by the background image acquisition circuit 24.
[0011]
Reference numeral 26 denotes a finger placement detection circuit that determines a finger placement state, and generates a finger placement detection signal 26a based on the input image 22a in the temporary frame 22 and the background image 25a in the background image frame 25.
[0012]
Reference numeral 27 denotes a fingerprint collation circuit that performs collation determination of a fingerprint, and outputs a determination result 27 a to the outside based on the input image 22 a in the temporary frame 22 and the finger placement detection signal 26 a from the finger placement detection circuit 26.
[0013]
Reference numeral 28 denotes an inverter inserted in a feedback loop from the finger placement detection circuit 26 to the calibration circuit 23 and the background image acquisition circuit 24, and inverts the finger placement detection signal 26a to generate a finger placement absence signal 28a.
[0014]
Reference numeral 29 denotes a first timer (hereinafter simply referred to as “timer”) that operates in response to the no-finger signal 28a, and generates a start signal 29a for the calibration circuit 23 after a lapse of a first period.
[0015]
Reference numeral 30 denotes a second timer (hereinafter simply referred to as a “timer”) that operates in response to the no-finger placement signal 28a, and generates an activation signal 30a for the background image acquisition circuit 24 after a lapse of a second period.
[0016]
Reference numeral 31 denotes a power switch which is externally operated by an operator, 32 denotes a power circuit which starts in response to an ON operation of the power switch 31, and 32a denotes a power output from the power circuit 32.
[0017]
When the power switch 31 is turned on, the power circuit 32 always supplies the power output 32a to all circuits in the IC card reader / writer with fingerprint authentication in the full power state.
[0018]
However, if the power output 32a is always supplied in the full power state when the power switch 31 is turned on, it is necessary to supply the full power of the power output 32a even when the internal circuit is not used after the power switch 31 is turned on. Therefore, the device life may be shortened due to abnormal heat generation.
[0019]
Further, since the finger rest part 12 (fingerprint sensor 20) is always exposed, the finger rest detection circuit 26, the inverter 28, and the timers 29 and 30 operate every time the state where the finger is not rested for a certain period of time. Since the finger placement no signal 28a is generated and the calibration circuit 23 and the background image acquisition circuit 24 are activated, the state where the finger is not placed is determined by the timer set time of each of the timers 29 and 30 (the first period, the first period). (2 periods) only.
[0020]
Therefore, for example, if the user places his / her finger on the finger placing unit 12 before the timer period elapses, calibration is performed in an incorrect state, so that the captured image is significantly disturbed and accurate fingerprint collation is not performed. This can be difficult.
Further, in this case, since the image of the finger placement state is captured as the background image, the finger placement state may not be similarly determined.
[0021]
[Problems to be solved by the invention]
As described above, in the conventional IC card reader / writer with fingerprint authentication, since the finger rest 12 is always exposed, there is a problem that the finger rest 12 which has a significant influence on the fingerprint authentication function may be damaged. There was a point.
[0022]
Further, since the finger rest 12 is always exposed, the state in which the finger is not rested depends on the set time of the timers 29 and 30. In addition, the captured image is remarkably disturbed due to the calibration in a proper state, and the image of the finger placed state is captured as the background image, so that there is a problem that accurate fingerprint collation and finger placed determination cannot be performed. .
[0023]
Further, the power supply circuit 32 supplies the power output 32a in the full power state to all the circuits every time the power switch 31 is turned on. And there is a problem that heat generation may shorten the life of the apparatus.
[0024]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an IC card reader / writer with fingerprint authentication that has improved reliability and reduced power consumption.
[0025]
[Means for Solving the Problems]
An IC card reader / writer device with fingerprint authentication according to the present invention comprises a card inserted between an IC card insertion slot into which an IC card is removably inserted, and an IC card inserted into the IC card insertion slot. A reader / writer means for exchanging information, a finger rest for a user to place a finger on, a fingerprint sensor arranged on the finger rest for detecting a user's fingerprint, and card information and a fingerprint sensor. A fingerprint information processing circuit, a shutter that moves to open and close the top surface of the fingerprint sensor, and a shutter that moves to the closed position and the open position in response to the insertion and removal of the IC card from the IC card insertion slot. A sliding unit for sliding, a detecting unit for detecting an open / closed state of the shutter, a power supply circuit for supplying power to the circuit unit in response to a detection signal from the detecting unit, The sliding means is provided with a shutter at a closed position covering an upper surface of the fingerprint sensor when the IC card is removed from the IC card insertion slot, and a fingerprint is provided when the IC card is inserted into the IC card insertion slot. A shutter is arranged at an open position for exposing the sensor, and when the detecting means detects the open state of the shutter, the power supply circuit selects a normal fingerprint collation mode and supplies power to all of the circuit sections. In the case of detecting the closed state of the shutter, the power-saving mode is selected to prohibit the power supply to the common circuit included in the circuit unit.
[0026]
Further, the circuit section of the IC card reader / writer device with fingerprint authentication according to the present invention includes a calibration circuit for generating a sensitivity adjustment signal for performing sensitivity correction between cells of the fingerprint sensor, and the calibration circuit includes a detection circuit. It functions when the means detects the closed state of the shutter.
[0027]
Also, the circuit section of the IC card reader / writer device with fingerprint authentication according to the present invention includes a first timer inserted between the detecting means and the calibration circuit. Starting when the closed state is detected, generating a start signal for the calibration circuit at a first interval, resetting when the detecting means detects the shutter open state, and interrupting the operation of the calibration circuit. It is.
[0028]
Further, the circuit section of the IC card reader / writer device with fingerprint authentication according to the present invention includes a background image acquisition circuit for acquiring a background image based on an input image from the fingerprint sensor, and an input image and background image from the fingerprint sensor. A finger placement detection circuit for comparing and detecting that a finger has been placed on the fingerprint sensor; and a fingerprint collation for comparing and collating an input image with predetermined fingerprint data in response to a finger placement detection signal from the finger placement detection circuit. And a circuit, wherein the background image acquisition circuit functions when the detection means detects the closed state of the shutter.
[0029]
Further, the circuit section of the IC card reader / writer device with fingerprint authentication according to the present invention includes a second timer inserted between the detection means and the background image acquisition circuit. Is activated when the closed state of the shutter is detected, a start signal for the background image acquisition circuit is generated at the second interval, and reset when the detection means detects the open state of the shutter. It is to interrupt.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.
1 and 2 are perspective views showing Embodiment 1 of the present invention. FIG. 1 shows a state where an IC card is not inserted, and FIG. 2 shows a state where an IC card is inserted.
[0031]
3 and 4 are side sectional views showing Embodiment 1 of the present invention. FIG. 3 shows a state where an IC card is not inserted, and FIG. 4 shows a state where an IC card is inserted. .
[0032]
FIG. 5 is a block diagram showing a circuit configuration according to the first embodiment of the present invention.
1 to 5, the same components as those described above (see FIGS. 7 and 8) are denoted by the same reference numerals, and detailed description thereof is omitted.
[0033]
1 and 2, reference numeral 14 denotes a shutter movably provided on the inner surface of the upper portion of the outer case 11, and reference numeral 15 denotes an IC card which is removably inserted into the IC card insertion slot 13.
[0034]
When the IC card 15 is not inserted (see FIG. 1), the shutter 14 completely covers the finger rest 12 (fingerprint sensor 20) in the finger rest window 12A, and the shutter 14 is inserted. In this state (see FIG. 2), the finger rest 12 is exposed by sliding in conjunction with the insertion operation of the IC card 15.
[0035]
Note that the shutter 14 only needs to have a shape and an arrangement covering the finger rest portion 12, and may be movably provided on the upper surface of the outer case 11.
[0036]
In FIGS. 3 and 4, reference numeral 16 denotes a card abutting claw that stands upright on the leading end of the shutter 14, and abuts against the leading end of the IC card 15 when the IC card 15 is inserted (see FIG. 4). It is arranged to move.
[0037]
A return spring 17 urges the shutter 14 in the closing direction (the state shown in FIG. 3), and together with the card abutment claw 16, constitutes a slide means for sliding the shutter 14 to the open / close position.
[0038]
Reference numeral 18 denotes a reed switch provided at the rear end of the shutter 14, which generates a power saving switching signal 18a (described later) in an OFF state (shutter closed state).
[0039]
Reference numeral 19 denotes a magnet provided on the inner surface of the outer case 11, and together with the reed switch 18, constitutes a detecting means for detecting the open / closed state of the shutter 14.
The magnet 19 faces the reed switch 18 when the IC card 15 is inserted (when the shutter is opened), and switches the reed switch 18 to the ON state (the power saving switching signal 18a is turned OFF).
[0040]
The card abutment claw 16 and the reed switch 18 are integrally formed on the inner surface side of the shutter 14, and one end of the return spring 17 is fixed to the tip of the shutter 14.
In addition, the fingerprint sensor 20 has the upper surface exposed portion constituting the finger rest portion 12, and is disposed so as to be located inside (covered by) the shutter 14 when the shutter 14 is closed.
[0041]
As shown in FIG. 3, when the IC card 15 is not inserted, the shutter 14 is located at a position that completely covers the fingerprint sensor 20 in the finger rest unit 12.
Also, as shown in FIG. 4, when the IC card 15 is inserted, the IC card 15 pushes the card abutment claw 16 integrated with the shutter 14, so that the shutter 14 moves in the insertion direction of the IC card 15.
[0042]
As shown in FIG. 4, when the IC card 15 is completely inserted, the reed switch 18 mounted on the shutter 14 and the magnet 19 mounted on the outer case 11 overlap and face each other.
[0043]
That is, when the IC card 15 is inserted into the IC card insertion slot 13, the reed switch 18 is turned on by the magnetic field of the magnet 19, and when the IC card 15 is removed from the IC card insertion slot 13, the reed switch 18 is turned off.
As a result, the inserted state and the removed state of the IC card 15 can be detected.
[0044]
Next, a circuit operation in response to the reed switch 18 according to the first embodiment of the present invention will be described with reference to FIGS.
In FIG. 5, reference numeral 33 denotes a power supply circuit which operates in response to a turn-on signal from the power switch 31 and a power saving switching signal 18a from the reed switch 18, and a power supply output 33a to a common circuit which contributes to an actual fingerprint authentication function. And a power supply output 33b to a standby circuit such as a basic CPU circuit (not shown).
[0045]
For example, as shown in FIG. 3, when the IC card 15 is removed and the reed switch 18 is turned off, the power supply circuit 33 in FIG. 5 enters a power saving mode, and the finger placement detection circuit 26 and the fingerprint collation circuit 27 are activated. The power supply output 33a for the common circuits such as the fingerprint authentication circuit units 20 to 30 is turned off, and the power supply output 33b is supplied only to the other standby circuits (CPU circuits).
[0046]
Therefore, even after the power switch 31 is turned on, unnecessary power supply to the common circuit can be avoided, and power saving can be realized.
Further, since the closed state (unused state) of the shutter 14 can be reliably recognized by the OFF state of the reed switch 18, it is possible to surely enter the power saving mode without giving the user a feeling of strangeness.
[0047]
At this time, when the IC card 15 is removed, the power output to the fingerprint authentication circuit units 20 to 30 is not only turned off, but also to other common circuits such as an IC card information authentication circuit unit (not shown). It goes without saying that the power supply output is also turned off.
[0048]
In addition, when the IC card 15 is not inserted, the finger is not placed on the finger placement unit 12 (fingerprint sensor 20) by the shutter 14, and an image based on incorrect calibration may be erroneously obtained. Since there is no fingerprint authentication, the reliability of fingerprint authentication can be improved.
[0049]
That is, the closed state of the shutter 14 (the state in which the finger is not placed) can be reliably detected by the OFF state of the reed switch 18, so that the calibration function may be erroneously operated improperly in the state where the finger is placed. In addition, it is possible to reliably prevent an illegal background image from being taken in a state where the finger is placed.
[0050]
In addition, the closed state of the shutter 14 can be reliably detected by the OFF state of the reed switch 18, and the state in which a finger is not placed on the finger placement unit 12 (fingerprint sensor 20) can be reliably recognized. Therefore, the specific control function of the fingerprint sensor 20 and the like can be reliably operated.
[0051]
Embodiment 2 FIG.
In the first embodiment, the OFF signal of the reed switch 18 (the power saving switching signal 18a) is used only for the power supply circuit 33, but may be used for the activation signals of the timers 29 and 30.
[0052]
FIG. 6 is a block diagram showing a circuit configuration according to the second embodiment of the present invention in which the power saving switching signal 18a is also used to start timers 29 and 30.
In FIG. 6, the same components as those described above (see FIG. 5) are denoted by the same reference numerals, and detailed description is omitted.
[0053]
In this case, the power saving switching signal 18 a from the reed switch 18 is input not only to the power supply circuit 33 but also to each of the timers 29 and 30.
Therefore, the inverter 26 (see FIG. 5) becomes unnecessary.
[0054]
Hereinafter, an operation according to the second embodiment of the present invention will be described with reference to FIGS.
For example, in a state where the IC card 15 is removed from the IC card insertion slot 13 and the shutter 14 is closed, and the finger is not securely placed, the sensor image 21a detected from the fingerprint sensor 20 is output to the image capturing circuit 21. Is taken into the temporary frame 22 via the.
[0055]
At this time, when the IC card 15 is removed and the reed switch 18 is turned off, the timer 29 starts in response to the power saving switching signal 18a, generates the start signal 29a at a predetermined interval, and activates the calibration circuit 23. to start.
[0056]
When activated, the calibration circuit 23 determines the sensitivity variation of each cell of the fingerprint sensor 20 based on the density of the input image 22a in the temporary frame 22, and corrects the sensitivity of each cell of the fingerprint sensor 20. The sensitivity adjustment signal 23a is generated so that a uniform image is obtained.
[0057]
Further, when the IC card 15 is removed and the reed switch 18 is turned off, the timer 30 starts at the same time as the timer 29, and generates the start signal 30a at a predetermined interval to start the background image obtaining circuit 24.
When activated, the background image acquisition circuit 24 transfers the input image 22a in the temporary frame 22 to the background image frame 25 as a background image.
[0058]
Here, when the user inserts the IC card 15, the reed switch 18 is turned on and the power saving switching signal 18a is turned off, so that the timer 29 is immediately reset and the operation of the calibration circuit 23 is interrupted.
At the same time, the timer 30 is also immediately reset, and the operation of the background image acquisition circuit 24 is interrupted.
[0059]
Subsequently, when the user puts a finger on the upper surface of the fingerprint sensor 20 (finger placement section 12), the fingerprint image detected by the fingerprint sensor 20 is taken into the temporary frame 22 from the image taking circuit 21.
[0060]
The finger placement detection circuit 26 determines that a finger has been placed on the fingerprint sensor 20 from the difference (> predetermined value) between the input image 22a in the temporary frame 22 and the background image 25a in the background image frame 25, The finger placement detection signal 26a is output to the fingerprint matching circuit 27.
[0061]
In response to the finger placement detection signal 26a, the fingerprint matching circuit 27 processes the input image 22a in the temporary frame 22 to generate feature data of the fingerprint image, and matches the feature data with pre-registered fingerprint data. By making the determination, a determination result 27a is output.
[0062]
As described above, the timer 29 is started in response to the power saving switching signal 18a, and the calibration circuit 23 for correcting the sensitivity between the fingerprint sensor cells is operated only when the shutter is closed. Since the calibration is performed by reliably recognizing that the calibration circuit 23 is not placed, it is possible to reliably prevent the calibration circuit 23 from functioning erroneously in the state where the finger is placed, and further improve the reliability. it can.
[0063]
Similarly, the timer 30 is started in response to the power saving switching signal 18a, and the finger is placed on the fingerprint sensor 20 by operating the background image acquisition circuit 24 for finger placement determination only when the shutter is closed. Since the background image is acquired by reliably recognizing that no background image is obtained, it is possible to reliably avoid acquiring an unauthorized background image with the finger placed, and further improve reliability.
[0064]
【The invention's effect】
As described above, according to the present invention, transfer of card information between an IC card insertion slot into which an IC card is removably inserted and an IC card in a state where the IC card is inserted into the IC card insertion slot is performed. Reader / writer means for performing the following operations: a finger rest for the user to place his / her finger; a fingerprint sensor disposed on the finger rest for detecting the fingerprint of the user; card information and fingerprint information from the fingerprint sensor , A shutter that moves to open and close the top surface of the fingerprint sensor, and a slide that slides the shutter to the closed position and the open position in response to the insertion and removal of the IC card from the IC card insertion slot. Means, a detecting means for detecting the open / closed state of the shutter, and a power supply circuit for supplying power to the circuit portion in response to a detection signal from the detecting means, When the IC card is removed from the IC card insertion slot, the shutter is disposed at a closed position covering the upper surface of the fingerprint sensor, and when the IC card is inserted into the IC card insertion slot, the open position exposing the fingerprint sensor. When the detecting means detects that the shutter is open, the power supply circuit selects the normal fingerprint collation mode and supplies power to all of the circuit sections. Is detected, the power saving mode is selected, and the power supply to the common circuits included in the circuit unit is prohibited. Therefore, the IC card reader with fingerprint authentication that improves the reliability and realizes the power saving is realized. There is an effect that a writer device can be obtained.
[0065]
According to the invention, the circuit unit includes a calibration circuit that generates a sensitivity adjustment signal for performing sensitivity correction between the cells of the fingerprint sensor, and the calibration circuit includes a detection unit that detects whether the shutter is closed. Since the function is activated when is detected, there is an effect that an IC card reader / writer with fingerprint authentication in which the reliability of the calibration function is further improved can be obtained.
[0066]
Further, according to the invention, the circuit unit includes the first timer inserted between the detection unit and the calibration circuit, and the first timer determines whether the detection unit detects the closed state of the shutter. At the first interval, a start signal for the calibration circuit is generated at a first interval, and reset when the detecting means detects the open state of the shutter, so that the operation of the calibration circuit is interrupted. There is an effect that an IC card reader / writer device with fingerprint authentication with further improved reliability can be obtained.
[0067]
Further, according to the invention, the circuit unit compares the input image from the fingerprint sensor and the background image with the background image acquisition circuit that acquires the background image based on the input image from the fingerprint sensor, and outputs the information on the fingerprint sensor. A finger placement detection circuit that detects that a finger has been placed, and a fingerprint matching circuit that compares and matches an input image with predetermined fingerprint data in response to a finger placement detection signal from the finger placement detection circuit; Since the image acquisition circuit functions when the detection unit detects the closed state of the shutter, an effect of obtaining an IC card reader / writer device with fingerprint authentication that further improves the reliability of the background image acquisition function can be obtained. is there.
[0068]
According to the invention, the circuit unit includes the second timer inserted between the detection unit and the background image acquisition circuit, and the second timer detects that the detection unit detects the closed state of the shutter. Since it is activated at a point in time and generates an activation signal for the background image acquisition circuit at a second interval, and is reset when the detection means detects the shutter open state, the operation of the background image acquisition circuit is interrupted. There is an effect that an IC card reader / writer with fingerprint authentication with further improved reliability of the background image acquisition function can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing Embodiment 1 of the present invention.
FIG. 2 is a perspective view showing Embodiment 1 of the present invention together with an IC card.
FIG. 3 is a side sectional view showing the first embodiment of the present invention.
FIG. 4 is a side sectional view showing Embodiment 1 of the present invention together with an IC card.
FIG. 5 is a block diagram showing a circuit configuration according to the first embodiment of the present invention.
FIG. 6 is a block diagram showing a circuit configuration according to a second embodiment of the present invention.
FIG. 7 is a perspective view showing a conventional IC card reader / writer with fingerprint authentication.
FIG. 8 is a block diagram showing a circuit configuration of a conventional IC card reader / writer with fingerprint authentication.
[Explanation of symbols]
Reference Signs List 11 outer case, 12 finger rest part, 12A finger rest window, 13 IC card insertion slot, 14 shutter, 15 IC card, 16 card abutment claw (slide means), 17 return spring (slide means), 18 reed switch (detection) Means), 18a power saving switching signal, 19 magnets (detection means), 20 fingerprint sensor, 21 image capture circuit, 22 temporary frame, 22a input image, 23 calibration circuit, 23a sensitivity adjustment signal, 24 background image acquisition circuit, 25 background image frame, 25a background image, 26 finger placement detection circuit, 26a finger placement detection signal, 27 fingerprint collation circuit, 27a determination result, 29 first timer, 29a activation signal, 30 second timer, 30a activation signal, 31 power switch, 33 power circuit, 33a power output to common circuit, 33b standby Power output to the circuit.

Claims (5)

An IC card insertion slot into which an IC card is detachably inserted,
Reader / writer means for exchanging card information with the IC card while the IC card is inserted into the IC card insertion slot;
A finger rest for the user to place a finger on,
A fingerprint sensor disposed on the finger rest to detect a fingerprint of the user;
A circuit for processing the card information and fingerprint information from the fingerprint sensor;
A shutter that moves to open and close the top surface of the fingerprint sensor;
Sliding means for sliding the shutter to a closed position and an open position in response to an insertion state and an extraction state of the IC card to be the IC card insertion slot;
Detecting means for detecting the open / closed state of the shutter;
A power supply circuit that supplies power to the circuit unit in response to a detection signal from the detection unit;
With
The slide means,
In a state where the IC card is removed from the IC card insertion slot, the shutter is disposed at a closed position covering the upper surface of the fingerprint sensor,
In a state where the IC card is inserted into the IC card insertion slot, the shutter is arranged at an open position exposing the fingerprint sensor,
The power supply circuit,
When the detecting unit detects the open state of the shutter, a normal fingerprint collation mode is selected to supply power to all of the circuit units,
When the detecting means detects that the shutter is closed, a power saving mode is selected to prohibit power supply to a common circuit included in the circuit unit, and an IC card reader / writer with fingerprint authentication is provided. apparatus. The circuit unit includes a calibration circuit that generates a sensitivity adjustment signal for performing sensitivity correction between the cells of the fingerprint sensor,
The IC card reader / writer with fingerprint authentication according to claim 1, wherein the calibration circuit functions when the detection unit detects a closed state of the shutter. The circuit unit includes a first timer inserted between the detection unit and the calibration circuit,
The first timer includes:
Starting at the time when the detecting means detects the closed state of the shutter, generating a start signal to the calibration circuit at a first interval,
3. The IC card reader / writer device with fingerprint authentication according to claim 2, wherein the device is reset when the detecting unit detects the open state of the shutter to interrupt the operation of the calibration circuit. The circuit unit includes:
A background image acquisition circuit that acquires a background image based on the input image from the fingerprint sensor,
A finger placement detection circuit that detects that a finger has been placed on the fingerprint sensor by comparing the input image from the fingerprint sensor and the background image,
In response to a finger placement detection signal from the finger placement detection circuit, a fingerprint matching circuit that compares and matches the input image with predetermined fingerprint data,
Including
The IC card with fingerprint authentication according to any one of claims 1 to 3, wherein the background image acquisition circuit functions when the detection unit detects a closed state of the shutter. Reader / writer device. The circuit unit includes a second timer inserted between the detection unit and the background image acquisition circuit,
The second timer is
Starting when the detecting means detects the closed state of the shutter, generating a start signal to the background image acquisition circuit at a second interval;
5. The IC card reader / writer device with fingerprint authentication according to claim 4, wherein the device is reset when the detection unit detects the open state of the shutter, and interrupts the operation of the background image acquisition circuit.

Images