JP2000093410A - Personal authentication apparatus and personal authentication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the stable authentication of persons with substantially no influence of a state, such as sweating of the fingers, or the influence of noise with a person authentication apparatus using the ruggedness information of the fingers. SOLUTION: A characteristic information signal is obtained by arraying a plurality of wire-shaped output electrodes 23 apart prescribed intervals along the longitudinal direction of the finger 22, disposing a single input electrode 24 at the ends of these plural output electrodes 23 along the longitudinal direction of the finger 22, successively changing over and connecting the outputs of an oscillator 27 which outputs signals of plural frequencies to the plural output electrodes 23 by an analog switch group 26, imparting an optimum gain by a gain controller 129 to the output which detects the electric signal obtained from the input electrode 24 in a detecting circuit 29 and supplying this output to an A/D converter 30. The state of the measured characteristic information is evaluated by using a characteristic information evaluating means and when the characteristic information is embedded in the noise, a fresh frequency and gain are applied thereto, by which the good characteristic information may be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a personal authentication apparatus for authenticating a person or another person using characteristic information of a finger to authenticate a specific individual, and a method of authenticating the same.

[0002]

2. Description of the Related Art In recent years, there has been an increasing interest in a personal authentication apparatus for identifying and authenticating a person to be authenticated as an individual registered in advance for the purpose of entry / exit control of important facilities.

There are various methods for personal authentication. Japanese Unexamined Patent Publication No. Hei 7-168930 discloses that a plurality of linear electrodes long in a direction perpendicular to the longitudinal direction of a finger are arranged at predetermined intervals along the longitudinal direction of the finger. Using a linear electrode array that is arranged, a signal obtained by sequentially reading the resistance values between adjacent linear electrodes when a finger is pressed on this linear electrode array in the longitudinal direction of the finger and combining the signals is used as the finger characteristic information. The method used is disclosed.

[0004]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. 7-1
The personal authentication device disclosed in Japanese Patent No. 68930 is a method of extracting the characteristic information of a finger by measuring the surface electric resistance value (DC impedance) of a human finger and performing identity verification. There is a problem that the characteristic information of the finger obtained by the state of the surface of the finger typified by the above is affected, and the personal authentication ability is reduced.

Further, since a finger, that is, a human body functions as an antenna, there is a problem that noise (noise) is superimposed on characteristic information due to the influence of electromagnetic waves radiated from a surrounding oscillation source. For this reason, a method has been already proposed in which a plurality of frequencies are used as signal source frequencies used for obtaining characteristic information, and characteristic information obtained from a frequency with less noise is adopted.

[0006] However, even when a plurality of signal source frequencies are used, it is difficult to remove noise including frequencies near the signal source frequency, and there is a problem that characteristic information is easily buried in the noise.

[0007] It is an object of the present invention to provide a personal authentication apparatus and an authentication method that can obtain only a characteristic signal with a high gain.

[0008]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned problems, and is arranged at predetermined intervals along the longitudinal direction of a finger of a person to be authenticated. A plurality of output electrodes to be contacted with a finger to be verified by a certifier, measurement condition selection means for selecting an appropriate selection condition group for measuring characteristics of a finger of a person to be authenticated, and selection by the measurement condition selection means An oscillator for selectively outputting the selected several frequencies, connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes, and a position where a part of the finger of the person to be authenticated can contact. A single input electrode with which the finger is brought into contact with the output electrode, and an electric signal obtained from the input electrode is detected for each frequency at which the oscillator oscillates, under conditions selected by the measurement condition selection means. By doing so, Detecting means for obtaining information of a finger to be matched, storing means for storing characteristic information to be verified in advance, and comparing characteristic information obtained by the detecting means with characteristic information stored in the storing means. Determining means for determining whether the user is the authenticated person or another person,
The present invention provides a personal authentication device characterized by comprising:

Further, the present invention provides a plurality of input electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and contacting the finger to be verified of the person to be authenticated along the arrangement direction. And a measurement condition selecting means for selecting an appropriate measurement condition group for measuring characteristics of the finger of the person to be authenticated, and arranged at a position where a part of the finger of the person to be authenticated can contact, and the finger is A single output electrode contacted with the input electrode, an output connected to the output electrode, an oscillator for selectively outputting signals of several frequencies set by the measurement condition selection means, and the plurality of inputs Reading means for sequentially reading each electric signal obtained from the electrode; and detecting the electric signal read by the reading means under the conditions set by the measurement condition selecting means for each frequency at which the oscillator oscillates. Characteristic information of fingers to be compared Detecting means for obtaining the characteristic information for comparison, and storage means for storing characteristic information to be compared in advance, and comparing the characteristic information obtained by the detecting means with the characteristic information stored in the storage means to obtain the target information. And a determination unit for determining whether the user is the authenticator or another person.

Further, the present invention provides a plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and the fingers to be collated by the person to be authenticated are contacted along the arrangement direction. An oscillator for selectively outputting a signal of an arbitrary range or a preset number of frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; A single input electrode that is disposed at a position where a part thereof can be touched, and the finger is brought into contact with the output electrode, and an electric signal obtained from the input electrode is preset for each frequency at which the oscillator oscillates. Detecting means for obtaining the characteristic information of the finger to be collated by the authenticated person by detecting the characteristic information, and evaluating the quality of the characteristic information obtained by the detecting means and selecting the best characteristic information. Selection means and A storage unit for storing the combined characteristic information, and comparing the characteristic information selected by the characteristic information selection unit with the characteristic information stored in the storage unit to determine whether the person to be authenticated is an individual or another person. And a determination means for determining whether or not the personal authentication device is a personal authentication device.

Still further, according to the present invention, a plurality of inputs are arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and the finger to be verified of the person to be authenticated is contacted along the arrangement direction. An electrode and a single output electrode that is arranged at a position where a part of the finger of the person to be contacted can come into contact with the finger and the input electrode, and an output is connected to this output electrode, and an arbitrary range Or, an oscillator that selectively outputs signals of several preset frequencies, reading means for sequentially reading each electric signal obtained from the plurality of input electrodes, and the oscillator reads the electric signal read by the reading means. By performing detection under conditions set in advance for each oscillation frequency, a detection unit that obtains characteristic information of a finger to be verified of a person to be authenticated, and the quality of the characteristic information obtained by the detection unit are evaluated. Feature for selecting feature information Report selection means, storage means for storing feature information for comparison in advance, and comparing the feature information selected by the feature information selection means with the feature information stored in the storage means, And a determination means for determining whether the person to be authenticated is an individual or another person.

Still further, according to the present invention, there are provided a plurality of output terminals which are arranged at predetermined intervals along the longitudinal direction of a finger of a person to be authenticated, and which a finger to be verified of the person to be authenticated contacts along the arrangement direction. An electrode, an oscillator for selectively outputting a signal of an arbitrary range or several frequencies set in advance, connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes, and a finger of the person to be authenticated. A single input electrode that is disposed at a position where a part of the finger can touch, and the finger is brought into contact with the output electrode, and an electric signal obtained from the input electrode.
By detecting under predetermined conditions for each frequency at which the oscillator oscillates, a detecting means for obtaining the characteristic information of the finger to be verified of the person to be authenticated, and evaluating the quality of the characteristic information obtained by the detecting means. A characteristic information evaluation means for determining whether the cause of the quality is in the measurement condition, a characteristic information selection means for selecting the best characteristic information, and the characteristic information evaluation means When it is determined that the information has not been obtained, a measurement condition selecting means for selecting a new appropriate measurement condition group, a storage means for storing feature information to be compared in advance, and a selection by the feature information selecting means Determining means for comparing the authenticated person with the authenticated person or another person by comparing the obtained characteristic information with the characteristic information stored in the storage means. There is provided an authentication device.

Still further, according to the present invention, a plurality of inputs are arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and the finger to be collated by the person to be authenticated is contacted along the arrangement direction. An electrode and a single output electrode that is arranged at a position where a part of the finger of the person to be contacted can come into contact with the finger and the input electrode, and an output is connected to this output electrode, and an arbitrary range Or, an oscillator that selectively outputs signals of several preset frequencies, reading means for sequentially reading each electric signal obtained from the plurality of input electrodes, and the oscillator reads the electric signal read by the reading means. By detecting under predetermined conditions for each oscillating frequency, a detecting means for obtaining characteristic information of the finger to be verified of the person to be authenticated, and evaluating whether the characteristic information obtained by the detecting means is good or bad. Is the cause in the measurement conditions? A characteristic information evaluating means for determining whether,
When the feature information selecting means for selecting the best feature information and the feature information evaluating means determine that good feature information has not been obtained due to inappropriate measurement conditions, a new appropriate measurement condition group is selected. Measurement information condition means, storage means for storing in advance characteristic information for comparison,
Judging means for comparing the characteristic information selected by the characteristic information selecting means with the characteristic information stored in the storage means to judge whether the person to be authenticated is an individual or another person. A personal authentication device is provided.

Still further, according to the present invention, an appropriate measurement condition group for measuring a projection signal of a finger of a subject is selected,
To a plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the subject, signals of the selected several frequencies are supplied in a predetermined order and selectively, and Each of the signals of the frequency supplied to the electrode in a predetermined order, using the input electrode in a state where the finger of the subject is interposed, the electric signal obtained using the input electrode,
It is an object of the present invention to provide a personal authentication method characterized by detecting a finger projection signal by detecting under conditions selected for each frequency, and comparing it with a previously registered finger projection signal.

Still further, according to the present invention, a plurality of output electrodes arranged at a predetermined interval along the longitudinal direction of a finger of a subject to be measured are supplied with signals of an arbitrary range or several frequencies set in advance. In a predetermined order, and selectively supplied, each of the signals of the frequency supplied to the plurality of electrodes in a predetermined order, using the input electrode in the state of intervening the finger of the subject, using the input electrode, The electric signal obtained by using the above is detected under the condition set in advance for each frequency, the quality of the detected signal is evaluated, and the best finger projection signal is obtained and registered in advance. The present invention provides a personal authentication method characterized by comparing with a projection signal of a finger.

Still further, according to the present invention, a plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the subject are provided with signals of an arbitrary range or several frequencies set in advance. In a predetermined order, and selectively supplied, each of the signals of the frequency supplied to the plurality of electrodes in a predetermined order, using the input electrode in the state of intervening the finger of the subject, using the input electrode, The electric signal obtained by using is detected under the condition set in advance for each frequency, and the quality of the detected signal is evaluated with respect to the detected signal. If it is determined that no proper signal was obtained, a new appropriate measurement condition is selected, and in the subsequent measurement, the measurement condition is updated to the newly selected measurement condition, and again, the measurer's Measure finger characteristic information and Seek signal and provides a personal authentication method characterized by comparing the projection signal of the finger that is registered in advance.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a configuration of a personal authentication device according to a first embodiment of the present invention.

As shown in FIG. 1, the personal authentication device inputs a one-dimensional pattern of the entire finger, ie, a projection signal V (i) generated by a difference in distance between a finger and an output electrode, which will be described in detail later. Unit 1, a control unit 2 for performing authentication processing for registering or collating a pattern input by the input unit 1 and controlling the entire apparatus, and an IC as storage means
A projection signal of each finger of the person to be authenticated, that is, characteristic information for collation is written and registered in the card 4 or, conversely, I
It comprises a read / write device 3 for reading the characteristic information for verification registered in the C card 4. The control unit 2 includes a feature information evaluation unit 6 for evaluating feature information obtained by a pattern input unit described below with reference to FIG.
Is connected.

The host machine 5 controls opening and closing of doors of important facilities, sounding of an alarm buzzer, and the like in accordance with a control signal from the control unit 2. The control target of the host machine 5 differs depending on the security system to which the personal authentication device is applied.

As shown in FIG. 2, for example, the IC card 4 includes a control element 11 composed of a CPU (central processing unit) as a control device, a nonvolatile data memory 12 whose storage contents can be erased, a working memory 13, a program It comprises a memory 14 and a contact portion 15 for obtaining electrical contact with the read / write device 3. Of these, the portions within the broken lines (control element 11, data memory 12, working memory 13, program memory 14)
Is composed of one or more IC chips and is embedded in the IC card body.

The data memory 12 is used for storing various data, and is composed of, for example, an EEPROM.
In this example, the data memory 12 stores feature information for verification, which is a projection signal of a finger of each person to be authenticated, and the like.

The working memory 13 is a memory for temporarily storing processing data and the like when the control element 11 performs processing, and is composed of, for example, a RAM (random access memory).

The program memory 14 includes, for example, a mask R
It is composed of an OM (read only memory) or the like, and stores a processing program of the control element 11 and the like.

FIG. 3 is a schematic diagram showing an example of the pattern input section 1.

As shown in FIG. 3, the pattern input unit 1
Is composed of a linear electrode array 21 composed of a plurality of strip electrodes (output electrodes) 23 arranged at predetermined intervals in the first direction and parallel to each other, and one input electrode 24 arranged in parallel with the output electrodes 23. Have. The output electrode 23 and the input electrode 2
4, the finger 22 to be verified of the subject is contacted.

The output electrode 23 extends in a direction perpendicular to the longitudinal direction of the finger 22 of the person to be authenticated.
At intervals of 10 mm, about 250 pieces (that is, about 50 m
m) are arranged. Note that the number of the output electrodes 23, that is, the length of the finger 22 of the linear electrode array 21 in the longitudinal direction is generally a length including the second joint completely from the tip of the finger 22.

The input electrode 24 is provided at an end of the linear electrode array 21 along the longitudinal direction of the finger 22 in a direction orthogonal to the longitudinal direction of the finger 22, and the width of the finger 22 in the longitudinal direction is equal to the output electrode 2.
It is formed so as to be equal to or slightly longer than the length of 3.

One end of each analog switch group 25 is connected to each of the plurality of output electrodes 23.

The analog switch group 25 is driven by the timing pulse output from the timing pulse generator 26, for example, to the output electrode 23 on the side where the tip of the finger 22 is located.
Are controlled to be turned on at a predetermined timing in order from a predetermined time.

The other ends of the analog switch group 25 are commonly connected, and this common connection point is connected to the output of the oscillator 27.

The oscillator 27 is of an oscillation frequency variable type which will be described later in detail with reference to FIG. 11, for example, and is formed so that the oscillation frequency can be selected from an arbitrary range or a predetermined number of frequencies. ing.

The input electrode 24 is grounded via a power supply unit or a device body (not shown) through a terminating resistor 28 and connected to an input terminal of a detection circuit 29.

The output of the detection circuit 29 is supplied to an A / D converter 30
Is input to The output of the detection circuit 29 is supplied to a gain controller (amplifier) 1 provided before the input terminal of the A / D converter 30, as will be described later in detail with reference to FIG.
The output value of the 29 feedback resistor (multi-tap type) 129a is switched to an appropriate resistance value under the control of the control unit 2, whereby the gain is adjusted to an arbitrary value.
The signal is input to the A / D converter 30.

The A / D converter 30 converts the characteristic signal of a specific frequency detected by the detection circuit 29 based on the timing pulse output from the timing pulse generator 26 into an A / D signal.
/ D conversion and output to the control unit 2.

In such a configuration, when the characteristic information is measured, when the finger 22 to be collated on the linear electrode array 21 is pressed in a direction orthogonal to the electrode arrangement direction, The analog switch group 25 is controlled by the finger 2
2 are sequentially switched along the length direction of the electrode array 21.
The output of the oscillator 27 is sequentially supplied to each of the output electrodes 23, the output of the output electrode 23 is detected by the input electrode 24, the potential difference generated at both ends of the terminating resistor 28 is detected by the detection circuit 29, and the gain controller 129 The gain is adjusted so that the characteristic information of the signal output from the detection circuit 29 has an optimum gain, and is converted into a digital signal by the A / D converter 30.

The timing pulse generator 26 generates a signal (pulse) for controlling the switching of the analog switch group 25 in a predetermined order and for controlling the sampling timing of the A / D converter 30. For example, as shown in FIG. The analog switch group 25 is switched at the falling part of the signal, and A is switched at the rising part.
A trigger for conversion into a digital signal by the / D converter 30 is provided.

Note that the oscillator 2 to the output electrode 23 is
The supply of a signal of a predetermined frequency from 7 and the extraction of the output at the input electrode 24 are repeated for each oscillation frequency based on a predetermined routine described later in detail with reference to FIGS.

Here, it is important to select conditions for measurement in order to accurately measure characteristic information of the finger. First, as shown in FIG. Second, as shown in FIG. 9, when feature information is measured under a plurality of measurement conditions, the best feature information is selected. Third, as shown in FIG. When the characteristic information is measured by a plurality of measurement conditions, when the best characteristic information is not obtained, a new measurement condition is selected, and a predetermined condition is updated by the selected measurement condition. The feature information of the finger can be prevented from being buried in noise.

The one-dimensional pattern of the entire finger thus obtained, that is, the projection signal V (i) obtained when a signal is supplied to an arbitrary output electrode 23 is as follows: V (i) = R × Vo / (Z (I) + Zf + Zc + R)

In the above equation, R is the impedance of the terminating resistor 28, Vo is the amplitude of the output voltage of the oscillator 27, Z
(I) shows the i-th output electrode 23 and the finger 2 by capacitive coupling.
2, Zf is the impedance of the finger 22 itself, and Zc is the impedance between the finger 22 and the input electrode 24 due to capacitive coupling.

FIG. 5 is a side view when the finger 22 is placed on the linear electrode array 21 and the projection signal V obtained at that time.
(I) is shown.

In FIG. 5, when the finger 22 and the output electrode 23 are in close contact with each other, as in the region (a), the capacitive coupling between the finger 22 and the output electrode 23 becomes strong,
Since the impedance Z (i) becomes smaller, the output signal V
(I) is a large value.

Conversely, the finger 22 and the output electrode 23 are located like the horizontal wrinkles near the first joint in the area (b) and the horizontal wrinkles near the second joint in the areas (c1) and (c2) in FIG. In a portion where is not in close contact, the capacitive coupling between the finger 22 and the output electrode 23 is weakened, and the impedance Z (i) is increased. Therefore, the output signal V (i) of the joint or wrinkle portion has a small value. Take.

Therefore, when a one-dimensional output obtained when a signal is supplied to each output electrode 23 is plotted in the longitudinal direction of the finger 22, the output signal V (i) shows a steep dip at a joint or a wrinkle portion. Have. That is, the output signal V (i)
Has the irregularity information of the finger 22. Less than,
This output signal V (i) is called a projection signal (feature information).

In such an input method, when the finger 22 and the output electrode 23 are in contact with each other, the impedance Z (i)
In addition, since the influence of the contact electric resistance between the finger 22 and the output electrode 23 appears, the influence of the state of the surface of the finger 22 cannot be completely removed, but the output frequency of the oscillator 27 is selected from several frequencies. By using it, not only the impedance due to capacitive coupling can be made sufficiently lower than the contact electric resistance, but also the influence of external noise components can be eliminated. Therefore, the fluctuation of the projection signal V (i) due to the change in the state of the finger 22 can be suppressed low, and a stable signal can always be obtained.

Next, the flow of processing in the above configuration will be described. The processing is roughly classified into two types, “registration” and “collation”. First, the registration process will be described with reference to the flowchart shown in FIG.

First, in step S1, the pattern input unit 1 fetches the projection signal V (i) of the finger 22.

Next, in step S2, the projection signal V (i) fetched in step S1 is stored (registered) in the data memory 12 of the IC card 4 as dictionary information, that is, characteristic information Vd (i) for comparison. ). This completes the registration process.

Next, the matching process will be described with reference to the flowchart shown in FIG.

First, in step S3, the projection signal V (i) of the finger 22 is fetched using the pattern input section 1.

Next, in step S4, a collation calculation is performed between the projection signal V (i) fetched in step S3 and the dictionary information Vd (i) stored in the data memory 12 of the IC card 4.

This collation calculation is realized by calculating the difference E according to the following procedure.

First, as prerequisite processing for obtaining the degree of difference E,

(Equation 1)

And

(Equation 2)

Using the data memory 1 of the IC card 4
2 is aligned with the dictionary information Vd (i) read out from No. 2 and the projection signal V (i) obtained from the input finger image.

In this case, Vd (i) and V shifted by m
The sum of the square error with (i + m) over a certain range is defined as S (m). In the above equations (2) and (3), N is the number of elements of V (i).

S (m) thus obtained is V (i + m)
Is a parameter representing the degree of coincidence between Vd (i) and
The smaller the value of (m), the higher the match. In the alignment, m is changed within a certain range.
M when the value of (m) becomes smaller is referred to as a displacement amount,
It is assumed that the alignment has been completed at the position of M.

Next,

(Equation 3)

And

(Equation 4)

Is used to calculate the degree of difference E. In addition,
N in the expressions (4) and (5) is the number of elements of V (i).

The difference E obtained by the equations (4) and (5) is obtained by adding a square error between the aligned input signal V (i + M) and the dictionary information Vd (i) over a certain range. To the 2nd of the dictionary information Vd (i) in the same range.
It is normalized by the sum of squares.

The degree of difference E is the input signal V
This represents the difference between (i + M) and the dictionary information Vd (i). The larger the value of the difference E is, the larger the difference between the two is.
A smaller value indicates that both are more similar.

Next, at step S5, the degree of difference E obtained as described above is calculated by using a predetermined threshold TH.
If [E ≦ TH], the process proceeds to step S6, where the person to be authenticated is determined to be the person himself, and the process ends.

If it is not [E ≦ TH] in step S5, it is determined that they do not match, and step S7
To determine that the person to be authenticated is another person and end the process.

When the collation processing is completed, the control unit 2
Sends the determination result to the host machine 5.

The host machine 5 performs processing in accordance with the result of the determination, such as opening the door when the person is determined to be an individual, and sounding an alarm buzzer when the person is determined to be another person.

FIG. 8 is a flowchart showing an example of the operation for obtaining the characteristic signal of the finger of the subject using the pattern input unit 1 shown in FIGS.

As shown in FIG. 8, the output frequency of the oscillator 27 applied to the strip electrode (output electrode) 23 of the pattern input unit 1 and the output output from the detection circuit 29 are used for the authentication operation by the authentication device. An adjustment value of the gain controller 129 for adjusting the gain of the signal is selected from several conditions stored in advance in the data memory 12 and stored in a predetermined area of the working memory 13 (S01). .

Next, the output frequency output from the oscillator 27 and the adjustment value of the gain controller 129 are set based on the selected measurement condition, and the characteristic information is measured (S02).

According to this method, the characteristic information is measured under predetermined measurement conditions that are hardly affected by the state of the finger of the subject or the temperature and humidity surrounding the measurement environment. Data is unavailable and retakes are reduced.

FIG. 9 is a flowchart showing another example of the operation for obtaining the characteristic information shown in FIG.

As shown in FIG. 9, the output frequency of the oscillator 27 applied to the strip electrode (output electrode) 23 of the pattern input unit 1 and the output output from the detection circuit 29 are used for the authentication operation by the authentication device. The adjustment value of the gain controller 129 for adjusting the gain of the signal is stored in a predetermined area of the working memory 13 when a plurality of conditions are selected from several conditions stored in the data memory 12 in advance. (S11).

Next, based on the selected plurality of measurement conditions, the output frequency output from the oscillator 27 and the adjustment value of the gain controller 129 are set, and the characteristic information is measured (S12).

Thereafter, it is determined whether or not the measurement of the characteristic information under all of the plurality of measurement conditions selected in step S11 has been completed (S13-Yes), and the most finger of the measured characteristic information is determined. The feature information in which the feature is reflected (the feature information is not buried in noise or cannot be determined due to input over) is selected, and the process proceeds to a personal authentication routine (S14).

According to this method, the influence of the temperature and humidity surrounding the state of the finger of the subject or the measurement environment and the influence of noise components or the like which may be input to the pattern input unit using the finger as an antenna are determined in advance. The characteristic information is measured according to the plurality of specified measurement conditions, and the data reflecting the characteristic of the finger is selected from the data obtained by the measurement, so that good characteristic information can be obtained.

FIG. 10 is a flowchart showing still another example of the operation for obtaining the characteristic information shown in FIGS. 8 and 9.

As shown in FIG. 10, the output frequency of the oscillator 27 applied to the strip electrode (output electrode) 23 of the pattern input unit 1 and the output output from the detection circuit 29 are used for the authentication operation by the authentication device. The adjustment value of the gain controller 129 for adjusting the gain of the signal is stored in a predetermined area of the working memory 13 when a plurality of conditions are selected from several conditions stored in the data memory 12 in advance. (S21).

Next, based on the selected plurality of measurement conditions, the output frequency output from the oscillator 27 and the adjustment value of the gain controller 129 are set, and the characteristic information is measured (S22).

Thereafter, it is determined whether or not the measurement of the characteristic information under all of the plurality of measurement conditions selected in step S11 has been completed (S23-Yes), and the most finger of the measured characteristic information is determined. The feature information evaluating means 6 evaluates whether or not the feature information in which the feature is reflected (the feature information is not buried in noise or cannot be determined due to over input) is obtained (S24), and the finger feature is evaluated. Is obtained (S24-Ye)
s) The process proceeds to a personal authentication routine (S25).

On the other hand, when the characteristic information measured under the influence of external noise (noise) or the like input to the input unit using the finger as an antenna is buried in the noise, or when the characteristic information cannot be detected due to gain over or the like (S24- No), a new measurement condition different from the measurement condition already selected in step S21 is selected, and the measurement condition stored in the working memory 13 is updated (S26).

According to this method, the influence of the temperature and humidity surrounding the state of the finger of the subject or the measurement environment and the influence of noise components or the like which may be input to the pattern input unit using the finger as an antenna are determined in advance. The characteristic information is measured under the specified plurality of measurement conditions, and the data obtained by the measurement is characterized by the fact that the characteristic information measured by the influence of the external noise (noise) or the like which is input using a finger as an antenna is buried in noise or gain over If the feature information cannot be detected due to, for example, another measurement condition is selected,
Characteristic information in which the characteristics of the finger are reflected is reliably obtained.
When the measurement conditions are updated, the data memory 1
Since the measurement conditions in 2 are also updated, the time required for subsequent measurements is reduced.

FIG. 11 is a schematic block diagram showing an example of a variable oscillation frequency oscillator that can be used in the pattern input section shown in FIG.

As shown in FIG. 11, the oscillator 27
A fundamental frequency generator 51 that oscillates signals of any frequency or a preset number of frequencies, and a frequency of a signal oscillated from the fundamental frequency generator 51 is divided at a predetermined ratio to generate a fundamental frequency. A frequency divider 52 that generates a signal having a lower frequency than the frequency of the signal of the frequency of the signal from the fundamental frequency generator 51, and multiplies the frequency of the signal oscillated from the fundamental frequency generator 51 by a predetermined ratio. A multiplier 53 for generating a high-frequency signal, a variable unit 54 for setting a frequency to be oscillated from the oscillator 27, and a fundamental frequency generator 51 for outputting a signal of the frequency set by the variable unit 54; 52 and the multiplier 53, the signals of various frequencies provided by the variable unit 54 are arbitrarily combined. It consists frequency synthesizer (synthesizer) 55 that generates and outputs an arbitrary frequency of the signal set by the variable unit 54. When the fundamental frequency generator 51 can output signals of a plurality of frequencies,
The frequency of the signal that can be output from the oscillator 27 can be set in a wide range. Note that this type of oscillator can be easily configured using an FPGA or the like.

FIG. 12 is a schematic block diagram showing an example of a gain controller usable for the pattern input section shown in FIG.

As shown in FIG. 12, the gain controller 129 switches the output value of the feedback resistor (multi-tap type) 129 a of the gain controller (amplifier) 129 to an appropriate resistance value under the control of the control unit 2. The gain is adjusted to an arbitrary size.
This is useful for selectively extracting the characteristic information that reflects the characteristic of the finger most among the measured characteristic information (the characteristic information is not buried in noise or cannot be distinguished due to excessive input).

FIG. 13 is a schematic block diagram showing an example of a band pass filter (BPF) unit that can be used in the pattern input section shown in FIG. An example in which a BPF unit is incorporated in the pattern input unit shown in FIG. 3 will be described later in detail with reference to FIG.

As shown in FIG. 13, the BPF 31
A band-pass filter 61 for passing only a signal of a predetermined frequency band, a fundamental frequency generator 63 for oscillating a signal of an arbitrary or predetermined frequency, and a frequency of a signal oscillated by the fundamental frequency generator 63 , A variable unit 62 for setting an arbitrary or predetermined frequency, and a frequency mixer 64. Frequency mixer 6
Numeral 4 is for outputting a frequency signal having a difference between the signal oscillated by the fundamental frequency oscillator 63 and the input frequency. The frequency oscillated by the fundamental frequency generator 63 is set to an arbitrary range or to some predetermined frequencies. By setting, it acts as a bandpass filter for a plurality of frequencies. Therefore, only a signal of a predetermined band is passed, and unwanted noise from the outside can be more effectively removed, and a more stable projection signal can be obtained.

FIG. 14 is a schematic diagram schematically showing the configuration of the personal authentication device according to the second embodiment of the pattern input section shown in FIG. In FIG. 14, regarding the configuration of the personal authentication device, the flow of the registration process, and the flow of the collation process,
Since the configuration is the same as that of the first embodiment shown in FIGS. 1 to 10, the description thereof will be omitted, and the features of the configuration of the pattern input unit 1 will be described.

In the personal authentication device shown in FIG. 14, the output electrode 23 and the input electrode 24 of the linear electrode array 21 are arranged at a predetermined distance from each other. According to this configuration, the finger 22a located on the input electrode 24 may be a different finger from the finger 22 to be verified located on the output electrode 23. Even in this case, the same operation and effect as those of the first embodiment can be obtained. The gain controller 1 shown in FIG. 12 is provided between the detection circuit 29 and the A / D converter 30.
29 is connected, the characteristic information that reflects the most characteristic of the finger among the measured characteristic information (the characteristic information is not buried in noise or cannot be distinguished due to excessive input) is selectively selected. Can be taken out.

FIG. 15 is a schematic diagram schematically showing a configuration of a personal authentication apparatus according to the third embodiment, which is different from the pattern input section shown in FIGS. 3 and 14. In FIG. 15, the configuration of the personal authentication device, the flow of the registration process and the flow of the collation process are the same as those in the first embodiment shown in FIGS. The features of the configuration of the input unit 1 will be described.

In the personal authentication apparatus shown in FIG. 15, in the third embodiment, each of the output electrodes 23 has an oscillator 27-1,
, 27-2,...
The outputs of −2,.
ON / OFF control is performed by a timing pulse from the controller. Even in this case, the same operation and effect as those of the first embodiment can be obtained. Since the gain controller 129 shown in FIG. 12 is connected between the detection circuit 29 and the A / D converter 30, the most characteristic of the finger among the measured characteristic information is reflected. (Characteristic information is not buried in noise or cannot be determined due to input over). Characteristic information can be selectively extracted.

FIG. 16 is a schematic diagram schematically showing a configuration of a personal authentication apparatus according to still another fourth embodiment of the pattern input section shown in FIGS. 3, 14 and 15. Also in FIG. 16, the configuration of the personal authentication device, the flow of the registration process and the flow of the collation process are the same as those in the first embodiment shown in FIGS. The features of the configuration of the input unit 1 will be described.

The personal authentication device shown in FIG. 16 has a linear electrode array 21 composed of a plurality of strip-shaped electrodes (input electrodes) 24 arranged at predetermined intervals in the first direction and parallel to each other. It has one output electrode 23 arranged. The finger 22 to be verified of the person to be authenticated is in contact with both the output electrode 23 and the input electrode 24.

The input electrode 24 extends in a direction perpendicular to the longitudinal direction of the finger 22 of the person to be authenticated.
Approximately 250 are arranged at intervals of 10 mm. In addition,
Number of input electrodes 24, ie, fingers 22 of linear electrode array 21
Is generally a length that completely includes the second joint from the tip of the finger 22. In addition, each input electrode 24 has
Each end of the analog switch group 25 is connected.

The output of the oscillator 27 is connected to the output electrode 23. As described with reference to FIG. 11, the oscillator 27 is formed so that the oscillation frequency can be selected from an arbitrary range or a predetermined number of frequencies.

Each input electrode 24 is connected to the analog switch group 2
5 are connected to the terminating resistor 28 and connected to the terminating resistor 28. The potential difference generated at both ends of the terminating resistor 28 is detected by the detecting circuit 29, and adjusted to the optimum gain (gain) by the gain controller 129. , A / D converter 30 converts the signal into a digital signal.

In this case, the gain controller 1
By the operation of 29, it is possible to selectively take out the feature information in which the feature of the finger among the measured feature information is reflected (the feature information is not buried in noise or cannot be determined due to input over). it can.

FIG. 17 is a schematic diagram schematically showing the configuration of a personal authentication apparatus according to still another fifth embodiment of the pattern input section shown in FIGS. 3, 14, 15, and 16. . In FIG. 17, the configuration of the personal authentication device,
Since the flow of the registration processing and the collation processing is the same as that of the first embodiment shown in FIGS. 1 to 10, the description thereof is omitted, and the characteristic part of the configuration of the pattern input unit 1 will be described.

As shown in FIG. 17, the pattern input section comprises a linear electrode array 21 composed of a plurality of strip electrodes (input electrodes) 24 arranged at predetermined intervals in the first direction and in parallel with each other. 24 has one output electrode 23 arranged in parallel. The output electrodes 23 and the input electrodes 24 of the linear electrode array 21 are arranged with a predetermined distance therebetween. According to this configuration, the finger 22a located on the input electrode 24 may be a different finger from the finger 22 to be verified located on the output electrode 23. Even in this case, the same operation and effect as those of the first embodiment can be obtained. Further, the output electrode 23 is not limited to being in contact with the finger 22a, but only needs to be in contact with a part of the body of the person to be authenticated. Since the gain controller 129 shown in FIG. 12 is connected between the detection circuit 29 and the A / D converter 30, the most characteristic of the finger among the measured characteristic information is reflected. (Characteristic information is not buried in noise or cannot be determined due to input over). Characteristic information can be selectively extracted.

FIG. 18 is a schematic diagram showing a modification of the first embodiment of the pattern input section shown in FIG. In addition,
In FIG. 18, the same elements as those shown in FIG. 3 are denoted by the same reference numerals, and detailed description will be omitted.

As shown in FIG. 18, the pattern input section 1 has a plurality of strip-shaped output electrodes 2 arranged at predetermined intervals.
3 and a single input electrode 24 arranged in parallel with the output electrode 23. In addition,
The finger 22 to be verified of the person to be authenticated is in contact with both the output electrode 23 and the input electrode 24. Also, the input electrode 2
Reference numeral 4 denotes an end of the linear electrode array 21 along the longitudinal direction of the finger 22, which is long in a direction orthogonal to the longitudinal direction of the finger 22,
2 is formed so that the width in the longitudinal direction is equal to or slightly longer than the length of the output electrode 23. Each output electrode 23
Are connected to one end of the analog switch group 25, respectively.

The analog switch group 25 is driven by the timing pulse output from the timing pulse generator 26, for example, to the output electrode 23 on the side where the tip of the finger 22 is located.
Are controlled to be turned on at a predetermined timing in order from a predetermined time.

The other ends of the analog switch group 25 are commonly connected, and this common connection point is connected to the output of the oscillator 27. The oscillation frequency of the oscillator 27 is selected from an arbitrary range or some predetermined frequencies as in the other embodiments described above.

The input electrode 24 is grounded through a terminating resistor 28 via a power supply unit or a device main body (not shown), and is connected to an input terminal of a detection circuit 29 via a BPF unit 31 shown in FIG. ing.

The output of the detection circuit 29 is given a predetermined gain by the gain controller 129 and input to the A / D converter 30.

The A / D converter 30 controls the A / D conversion in accordance with the timing pulse output from the timing pulse generator 26.
Perform D conversion.

In such a configuration, a finger 22 to be collated is pressed on the linear electrode array 21 in a direction perpendicular to the electrode arrangement direction. At this time, the analog switch group 25 is sequentially switched along the length direction of the finger 22, and the output of the oscillator 27 is sequentially connected to each output electrode 23.

Hereinafter, the output of the output electrode 23 is
, And a potential difference generated at both ends of the terminating resistor 28 is detected by a detection circuit 29 and converted into a digital signal by an A / D converter 30.

As is well known, the BPF unit 31 passes only a signal in a predetermined band.
Unwanted external noise can be more effectively removed, and a more stable projection signal can be obtained. 1 is provided between the detection circuit 29 and the A / D converter 30.
Since the gain controller 129 shown in FIG. 2 is connected, the most characteristic of the finger among the measured characteristic information is reflected (the characteristic information is not buried in noise or cannot be determined due to input over). Feature information can be selectively extracted.

FIG. 19 is a schematic diagram showing a modification of the third embodiment of the pattern input section shown in FIG. In FIG. 19, the same elements as those shown in FIG. 15 are denoted by the same reference numerals, and detailed description will be omitted.

As shown in FIG. 19, the pattern input section includes oscillators 27-1 and 27-
,... Are connected, and each of the oscillators 27-1, 27-2,.
,... Are turned on and off by the timing pulse from the timing pulse generator 26.

The oscillation frequency of each of the oscillators 27-1, 27-2,... Is selected from several predetermined frequencies.

The input electrode 24 is grounded through a power supply unit or a device main body (not shown) through a terminating resistor 28, and is connected to an input terminal of a detection circuit 29 through a BPF unit 31. The detection circuit 29 and the A / D
Since the gain controller 129 shown in FIG. 12 is connected between the converter 30 and the converter 30, the most characteristic of the finger among the measured characteristic information is reflected (the characteristic information is buried in noise, (It is not in a state where it cannot be determined due to input over.) Feature information can be selectively extracted.

FIG. 20 is a schematic diagram schematically showing a modification of the fourth embodiment of the pattern input section of the present invention shown in FIG. In FIG. 20, the same elements as those shown in FIG. 16 are denoted by the same reference numerals, and detailed description will be omitted.

The personal authentication device shown in FIG. 20 has a linear electrode array 21 composed of a plurality of strip-shaped electrodes (input electrodes) 24 arranged in parallel in a first direction at predetermined intervals and in parallel with each other. It has one output electrode 23 arranged. The finger 22 to be verified of the person to be authenticated is in contact with both the output electrode 23 and the input electrode 24.

More specifically, the input electrode 24 extends in a direction perpendicular to the longitudinal direction of the finger 22 of the person to be authenticated.
In the longitudinal direction, the distal end of the finger 22 to the second joint are formed so as to be in contact with each other.

Each input electrode 24 is connected to the analog switch group 2
5, and are grounded via a power supply unit or a device body (not shown) via a terminating resistor 28 and connected to an input terminal of a detection circuit 29 via a BPF unit 31. I have. The output of the detection circuit 29 is converted into a digital signal by the A / D converter 30. Since the gain controller 129 shown in FIG. 12 is connected between the detection circuit 29 and the A / D converter 30, the most characteristic of the finger among the measured characteristic information is reflected. (Characteristic information is not buried in noise or cannot be determined due to input over). Characteristic information can be selectively extracted.

Next, a pattern input unit having a structure different from that of the pattern input unit shown in FIG. 3 will be described.

In the pattern input section shown in FIGS. 3, 14 to 20, the output electrode 23 and the input electrode 24 on which the finger 22 or the finger 22a is located and the finger 22 or the finger 22a are in direct contact. is there. Therefore, when the fingers 22 and 22a are wet or sweaty,
The fluctuation of the output of the projection signal V (i) tends to increase.

FIG. 21 is a schematic diagram showing a side surface of the pattern input unit capable of reducing the fluctuation of the output of the projection signal V (i) described above.

As shown in FIG. 21, the pattern input section covers the entire area of the output electrode 23 and the input electrode 24 where the finger 22 or 22a is located with an insulator 32 formed of, for example, a resin material. , Features.

FIG. 21 shows an output signal V (i) obtained by pressing the finger 22 against the linear electrode array 21 from above the insulator 32. The output signal V (i) is displayed as the projection signal V (i), as described above. In addition, by covering the output electrode 23 and the input electrode 24 with the insulator 32, the output electrode 23 and the input electrode
2 is connected only by electrostatic coupling (capacitive coupling), so that the contact resistance between the finger 22 and the electrodes 23 and 24 becomes infinite, and has no effect on changes in the state of the surface of the finger 22 such as sweating. Without being performed, a stable projection signal V (i) can be obtained.

Next, modified examples of the output electrode and the input electrode of the pattern input section described with reference to FIGS. 3, 14 to 20 will be described.

The pattern input section shown in FIG. 22 has a plurality of output electrodes 23 arranged at regular intervals, for example, in a matrix of 3 rows × 5 columns, and at intervals substantially equal to the intervals at which the output electrodes 23 are arranged. It has input electrodes 24 arranged in a matrix of 1 row × 5 columns. Note that each output electrode 23 is connected to the analog switch group 25 shown in FIG.

In FIG. 22, an output electrode 23 located at an arbitrary position is connected to an oscillator 27 by a corresponding switch of an analog switch group 25, and an input electrode 24
, The output is input.

According to the electrode arrangement shown in FIG.
Two-dimensional unevenness information such as a fingerprint can be captured as an image.

FIG. 23 shows a configuration in which the input electrodes and the output electrodes in the pattern input section shown in FIG. 22 are exchanged, and a plurality of input electrodes 24 arranged at equal intervals, for example, in a matrix of 3 rows × 5 columns. And the output electrodes 23 arranged in a matrix of, for example, 1 row × 5 columns at intervals substantially equal to the intervals at which the input electrodes 24 are arranged. Note that an oscillator 27 shown in FIG. 11 is connected to each output electrode 23, and a signal input to the input electrode 24 is output to a detection circuit 29 via an analog switch group 25.

[0129]

As described in detail above, according to the present invention,
It is possible to provide a personal authentication device that is less susceptible to a change in the state of the finger surface such as sweating and can improve the personal authentication ability.

Further, since a plurality of different frequencies are used in detecting the unevenness information of the finger and are detected with an arbitrary gain, the degree of difference is obtained from the output signal having the lowest noise level, and Since the user is identified as the user, highly accurate personal authentication can be performed.

Further, if good characteristic information cannot be obtained even when a plurality of frequencies and arbitrary gains are used due to the influence of external noise or the like, new measurement conditions of different frequencies and gains are selected, and Since the information is measured, characteristic information that reflects the characteristics of the finger can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a configuration of a personal authentication device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of an IC card used in the personal authentication device shown in FIG.

FIG. 3 is an exemplary diagram showing an example of the configuration of a pattern input unit that can be used in the personal authentication device shown in FIG. 1;

FIG. 4 is a timing chart showing an example of control timing by a timing pulse in the pattern input unit shown in FIG. 3;

FIG. 5 is a schematic diagram showing a relationship between a state in which a finger is placed on the pattern input unit shown in FIG. 3 when viewed from the side, and a magnitude of an output signal output depending on unevenness of the side of the finger;

FIG. 6 is a flowchart for explaining a registration process in the personal authentication device shown in FIG. 1;

FIG. 7 is a flowchart illustrating a matching process in the personal authentication device shown in FIG. 1;

8 is a flowchart showing an example of an operation for measuring feature information using the pattern input unit shown in FIG.

FIG. 9 is a flowchart showing another example of the operation for measuring feature information using the pattern input unit shown in FIG. 8;

FIG. 10 is a flowchart illustrating an example of an operation of measuring characteristic information that is different from the operation for measuring characteristic information using the pattern input unit illustrated in FIG. 3;

FIG. 11 is a schematic diagram showing an example of an oscillation frequency variable oscillator that can be used for each pattern input unit.

FIG. 12 is a schematic diagram showing an example of a gain controller that can be used for each pattern input unit.

FIG. 13 is a schematic diagram showing an example of a BPF unit that can be used for each pattern input unit.

FIG. 14 is a schematic diagram showing a configuration of a pattern input unit of the personal authentication device according to the second embodiment of the present invention.

FIG. 15 is a schematic diagram showing a configuration of a pattern input unit of a personal authentication device according to a third embodiment of the present invention.

FIG. 16 is a schematic diagram showing a configuration of a pattern input unit of a personal authentication device according to a fourth embodiment of the present invention.

FIG. 17 is a schematic diagram showing a configuration of a personal authentication device according to a fifth embodiment of the present invention in which no pattern is input;

FIG. 18 is a schematic diagram showing a modification of the first embodiment of the pattern input unit of the present invention shown in FIG. 3;

FIG. 19 is a schematic diagram showing a modification of the third embodiment of the pattern input unit of the present invention shown in FIG. 15;

FIG. 20 is a schematic diagram showing a modification of the fourth embodiment of the pattern input unit of the present invention shown in FIG. 16;

FIG. 21 is a schematic diagram showing a side view of a pattern input unit capable of reducing a variation in an output signal output from the pattern input unit shown in FIGS. 3, 14 to 20;

FIG. 22 is a schematic diagram illustrating another embodiment of the output electrode and the input electrode of the pattern input unit shown in FIGS. 3, 14 to 20;

FIG. 23 is a schematic diagram illustrating another embodiment of the output electrode and the input electrode of the pattern input unit shown in FIGS. 3, 14 to 20;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pattern input part, 2 ... Control part, 3 ... Read / write part, 4 ... IC card (storage means), 5 ... Host machine, 11 ... Control element, 12 ... data memory 13 ... working memory 14 ... program memory 15 ... contact part 21 ... linear electrode array 22 ... finger 23 ... output electrode 24 ... Input electrode, 25 ... Analog switch group, 26 ... Timing pulse generator, 27 ... Oscillator, 28 ... Terminal resistor, 29 ... Detector circuit, 30 ... A / D Converter 31 band-pass filter (band limiting means) 32 insulator thin film (electric insulator) 129 gain controller

Claims (15)

[Claims] A plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of a finger of a person to be authenticated, and a plurality of output electrodes contacted with a finger to be verified of the person to be authenticated along the arrangement direction; Measurement condition selection means for selecting an appropriate selection condition group for measuring the characteristics of the finger of the person, an oscillator for selectively outputting some frequencies selected by the measurement condition selection means, and an output of the oscillator A connection means for sequentially switching connection to the plurality of output electrodes, and a single input electrode disposed at a position where a part of the finger of the person to be authenticated can be contacted, and the finger is brought into contact with the output electrode, By detecting the electric signal obtained from the input electrode under the condition selected by the measurement condition selecting unit for each frequency at which the oscillator oscillates, a detecting unit that obtains information of a finger to be verified of the person to be authenticated, Write feature information for verification in advance. Storage means for storing, and comparing the characteristic information obtained by the detection means with the characteristic information stored in the storage means to determine whether the user is the authenticated person or another person. And a personal authentication device comprising: 2. A plurality of input electrodes arranged at predetermined intervals along a longitudinal direction of a finger of a person to be authenticated, and a plurality of input electrodes contacted with a finger to be verified of the person to be authenticated along the arrangement direction; Measurement condition selecting means for selecting an appropriate measurement condition group for measuring the characteristics of the finger of the person to be authenticated, provided at a position where a part of the finger of the person to be authenticated can come into contact, and the finger comes into contact with the input electrode. A single output electrode, an oscillator connected to the output electrode and selectively outputting signals of several frequencies set by the measurement condition selection means, and the plurality of input electrodes. Reading means for sequentially reading each electric signal; and detecting the electric signal read by the reading means under the condition set by the measurement condition selecting means for each frequency at which the oscillator oscillates. Detecting hand that obtains finger characteristic information And storage means for storing in advance the characteristic information for verification, by comparing the characteristic information obtained by the detection means with the characteristic information stored in the storage means, A personal identification device comprising: a determination unit configured to determine whether there is a person or another person. 3. A plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and a plurality of output electrodes to be contacted with the finger to be verified of the person to be authenticated along the arrangement direction; An oscillator for selectively outputting a signal of a range or a predetermined number of frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; A single input electrode disposed at a possible position, wherein the finger is brought into contact with the output electrode, and an electric signal obtained from the input electrode is detected under predetermined conditions for each frequency at which the oscillator oscillates. Detecting means for obtaining the characteristic information of the finger to be verified of the person to be verified, and characteristic information selecting means for evaluating the quality of the characteristic information obtained by the detecting means and selecting the best characteristic information, Feature information for collation in advance A storage unit for storing, and comparing the feature information selected by the feature information selection unit with the feature information stored in the storage unit to determine whether the user is the authenticated person or another person A personal identification device, comprising: 4. A plurality of input electrodes which are arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and are contacted with a finger to be verified of the person to be authenticated along the arrangement direction; A single output electrode which is disposed at a position where a part of the user's finger can be contacted, the finger is brought into contact with the input electrode, and an output is connected to this output electrode, and an arbitrary range or a preset value is set. An oscillator for selectively outputting signals of several frequencies; reading means for sequentially reading each electric signal obtained from the plurality of input electrodes; and an electric signal read by the reading means for each frequency at which the oscillator oscillates. A detection unit that obtains characteristic information of a finger to be collated by a person to be authenticated by performing detection under a preset condition; and evaluating the quality of the characteristic information obtained by the detection unit and selecting the best characteristic information. Feature information selection means, A storage unit for storing characteristic information for comparison, and comparing the characteristic information selected by the characteristic information selection unit with the characteristic information stored in the storage unit to determine whether the user is the authenticated person. A personal identification device comprising: a determination unit configured to determine whether the user is another person. 5. A plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the person to be authenticated, and a plurality of output electrodes with which a finger to be verified of the person to be authenticated contacts along the arrangement direction; An oscillator for selectively outputting a signal of a range or a predetermined number of frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; A single input electrode disposed at a possible position, wherein the finger is brought into contact with the output electrode, and an electric signal obtained from the input electrode is detected under predetermined conditions for each frequency at which the oscillator oscillates. And a detecting unit that obtains characteristic information of the finger to be verified by the authentication target, and evaluates whether the characteristic information obtained by the detecting unit is good or not, and determines whether the cause of the good or bad is in the measurement condition. Feature information evaluation means and best features A feature information selecting means for selecting information in said characteristic information evaluating means, when a good characteristic information is determined to not be obtained by improper measurement conditions,
A measurement condition selection unit for selecting a new appropriate measurement condition group; a storage unit for storing feature information to be compared in advance; and feature information selected by the feature information selection unit and stored in the storage unit. A personal identification device comprising: a determination unit that determines whether the person to be authenticated is an individual or another person by comparing the characteristic information with the authenticated person. 6. A plurality of input electrodes arranged at predetermined intervals along the longitudinal direction of a finger of a person to be authenticated, and a plurality of input electrodes contacted with a finger to be verified of the person to be authenticated along the arrangement direction; A single output electrode which is disposed at a position where a part of the user's finger can be contacted, the finger is brought into contact with the input electrode, and an output is connected to this output electrode, and an arbitrary range or a preset value is set. An oscillator for selectively outputting signals of several frequencies; reading means for sequentially reading each electric signal obtained from the plurality of input electrodes; and an electric signal read by the reading means for each frequency at which the oscillator oscillates. A detection unit that obtains characteristic information of a finger to be verified by a detection target by performing detection under a preset condition, and evaluates whether or not the characteristic information obtained by the detection unit is good or bad. Characteristic information to determine whether there is And evaluation means, and wherein the information selecting means for selecting the best feature information in the feature information evaluating means, when a good characteristic information is determined to not be obtained by improper measurement conditions,
Measurement information condition means for selecting a new appropriate measurement condition group; storage means for storing feature information to be compared in advance; feature information selected by the feature information selection means and stored in the storage means Determining means for determining whether the person to be authenticated is an individual or another person by comparing the characteristic information with the authenticated person. 7. The personal authentication apparatus according to claim 1, wherein said characteristic information selecting means selects characteristic information which is less affected by noise. 8. The personal authentication apparatus according to claim 1, wherein said characteristic information selecting means selects characteristic information whose characteristic information has an optimum signal intensity. 9. The characteristic information selecting means according to claim 7, wherein said characteristic information selecting means selects a detection gain so that a signal intensity of characteristic information obtained by detection by said detecting means has an optimum intensity. Personal authentication device. 10. The personal authentication apparatus according to claim 5, wherein said characteristic information evaluation means evaluates the degree of influence of noise on characteristic information obtained by detection by said detection means. 11. The personal authentication apparatus according to claim 5, wherein said characteristic information evaluation means evaluates a signal strength of characteristic information obtained by detection by said detection means. 12. An output electrode or an input electrode arranged at predetermined intervals along the longitudinal direction of the subject's finger is divided into a plurality of parts in a direction perpendicular to the longitudinal direction of the subject's finger. The finger irregularity information input device according to any one of claims 1 to 6, wherein the finger irregularity information input device is arranged. 13. A plurality of output electrodes arranged at predetermined intervals along a longitudinal direction of a finger of a person to be measured by selecting an appropriate group of measurement conditions for measuring a projection signal of the finger of the person to be measured. The signals of the selected several frequencies are supplied in a predetermined order and selectively, and each of the signals of the frequencies supplied to the plurality of electrodes in a predetermined order is interposed with a finger of a subject. In this state, the input signal is captured using an input electrode, and an electric signal obtained using the input electrode is detected under conditions selected for each of the frequencies to obtain a finger projection signal. A personal authentication method characterized by comparing with a signal. 14. A plurality of output electrodes arranged at predetermined intervals along a longitudinal direction of a finger of a subject to be measured, by applying signals of an arbitrary range or several frequencies set in advance in a predetermined order, and Selectively supplying, capturing each of the signals of the frequency supplied to the plurality of electrodes in a predetermined order using an input electrode in a state where a finger of a subject is interposed, and obtained using the input electrode. The detected electric signal is detected under the condition set in advance for each frequency, the quality of the detected signal is evaluated, and the best finger projection signal is obtained. A personal authentication method characterized by comparing with a signal. 15. A signal of an arbitrary range or a predetermined number of frequencies is applied to a plurality of output electrodes arranged at predetermined intervals along the longitudinal direction of a finger of a subject in a predetermined order, and Selectively supplying, capturing each of the signals of the frequency supplied to the plurality of electrodes in a predetermined order using an input electrode in a state where a finger of a subject is interposed, and obtained using the input electrode. The detected electric signal is detected under conditions set in advance for each frequency, and the quality of the detected signal is evaluated. As a result of the evaluation, a good signal is obtained due to inappropriate measurement conditions. If it is determined that the measurement condition has not been selected, a new appropriate measurement condition is selected, and in the subsequent measurement, the measurement condition is updated to the newly selected measurement condition, and the characteristic information of the finger of the measurer is updated again. Measure to obtain the finger projection signal, and Personal authentication method characterized by comparing the projection signal of the finger being recorded.