JPH1196359A - Ruggedness of finger information input device and device and method for personal certification - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable stable personal certification while being hardly affected by a state change on the surface of a finger caused by sweat or the like or external noises in a ruggedness information input device for finger and a device for personal certification. SOLUTION: Plural linear output electrodes 23 are arranged at prescribed intervals along with the lengthwise direction of a finger 22 and at the terminal part of these plural output electrodes 23 along with the lengthwise direction of the finger 22, a single input electrode 24 is arranged. Then, the output of an oscillator 27 to output the signals of plural frequencies is connected while being successively switched to the plural output electrodes 23, an electric signal provided from the input electrode 24 is detected by a detection circuit 29, and that output is converted to a digital signal by an A/D converter 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finger unevenness information input device for inputting unevenness information as characteristic information of an individual finger, and a person or another person using the finger unevenness information input device. The present invention relates to a personal authentication device for performing personal authentication of a certain person.

[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.

[0003] There are various methods for personal authentication. As a method of performing personal authentication using a pattern of the entire finger, for example, as disclosed in Japanese Patent Laid-Open No. 2-178777, an optical system of the entire finger is used. There is a method in which an image is fetched and collation is performed by using an addition signal obtained by adding pixel values of the image in a direction orthogonal to the longitudinal direction of the finger as characteristic information of the finger. However, in this method, since an optical system is required, there is a limit in downsizing the device.

In order to solve such a problem, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-168930, instead of using an optical system, a plurality of lines long in a direction orthogonal to the longitudinal direction of a finger are used. Using a linear electrode array in which linear electrodes are arranged at predetermined intervals along the longitudinal direction of the finger, the resistance value between adjacent linear electrodes when a finger is pressed on this linear electrode array is determined by the length of the finger. A method has been proposed in which signals sequentially read and synthesized in directions are used as characteristic information of a finger.

[0005]

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. In addition, there is a problem that the characteristic information of the obtained finger is affected by the state of the surface of the finger, and the personal authentication ability is reduced.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a finger unevenness information input device and a personal authentication device that are less susceptible to changes in the state of the finger surface such as sweating and that can improve the personal authentication capability.

[0007]

SUMMARY OF THE INVENTION The present invention has been made based on the above-described problems, and is arranged at predetermined intervals along the longitudinal direction of a finger of a person to be measured. A plurality of output electrodes to be touched by a finger to be input, an oscillator for selectively outputting a signal of an arbitrary range or a predetermined number of frequencies, and an output of the oscillator sequentially output to the plurality of output electrodes. A connection means for switching connection, a single input electrode disposed at a longitudinal end of the plurality of output electrodes, the finger being in contact with the output electrode, and a single input electrode obtained from the input electrode A detection means for detecting an electric signal for each frequency oscillated by the oscillator, and a finger unevenness information input device.

The present invention also provides a plurality of input electrodes which are arranged at predetermined intervals along the longitudinal direction of a finger of a person to be measured and which are in contact with a finger to which irregularity information is to be input along the arrangement direction; A single output electrode, which is disposed at the end of the plurality of input electrodes along the longitudinal direction of the finger, and the finger is brought into contact with the input electrode, an output is connected to the output electrode, and an arbitrary range or An oscillator for selectively outputting signals of several preset frequencies, reading means for sequentially reading electric signals obtained from the plurality of input electrodes, and the oscillator oscillating the electric signals read by the reading means And a detecting means for detecting for each frequency to be detected.

Further, the present invention provides a plurality of output electrodes which are arranged at predetermined intervals along a longitudinal direction of a finger of a person to be measured and which are in contact with a finger to which irregularity information is to be input 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; and a part of the body of the subject A single input electrode arranged so as to be able to contact, and an electric signal obtained from this input electrode,
Detection means for detecting each frequency at which the oscillator oscillates,
The present invention provides a finger unevenness information input device characterized by comprising:

Still further, according to the present invention, there are provided a plurality of input electrodes which are arranged at predetermined intervals along the longitudinal direction of a finger of a person to be measured, and which are in contact with a finger to be input with unevenness information along the arrangement direction. A single output electrode arranged so that a part of the body of the subject can be contacted, and the output is connected to this output electrode,
An oscillator for selectively outputting signals of an arbitrary range or a preset number of 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. And a detecting means for detecting each frequency at which the oscillator oscillates.

Still further, according to the present invention, a plurality of output electrodes 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 oscillator for selectively outputting a signal of an arbitrary range or a preset number of frequencies, connection means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes, A single input electrode disposed at an end of the finger along the longitudinal direction, wherein 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. Detecting means for obtaining characteristic information of a finger to be verified of the person to be verified, storage means for storing characteristic information for verification in advance, and characteristic information obtained by the detecting means and the storage means Remembered in By collating the characteristic information,
And a determination means for determining whether the person to be authenticated is a person or another person.

Still further, according to the present invention, a plurality of input electrodes are arranged at predetermined intervals along a longitudinal direction of a finger of a person to be authenticated, and a finger to be verified of the person to be authenticated is contacted along the arrangement direction. A single output electrode disposed at an end of the plurality of input electrodes along the longitudinal direction of the finger, the finger being in contact with the input electrode, and an output connected to the output electrode; An oscillator for selectively outputting signals of a range or a number of preset frequencies, reading means for sequentially reading electric signals obtained from the plurality of input electrodes, and an oscillator for reading the electric signals read by the reading means. Detecting means for detecting the characteristic information of the finger to be verified of the person to be verified by detecting each frequency at which oscillation occurs, storage means for preliminarily storing characteristic information for verification, and the detecting means. Feature information and Determining means for determining whether the person to be authenticated is an individual or another person by comparing characteristic information stored in the storage means with a personal identification device. It is.

Still further, the present invention provides a plurality of output electrodes which are arranged at predetermined intervals along the longitudinal direction of the finger of the person to be measured, and which are in contact with a finger to which unevenness information is to be input along the arrangement direction. An oscillator for selectively outputting a signal of an arbitrary range or a preset number of frequencies, connection means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes, and a finger for the plurality of output electrodes A single input electrode disposed at an end along the longitudinal direction of the oscillator, the finger being in contact with the output electrode, and an electric signal obtained from the input electrode detected at each frequency at which the oscillator oscillates. Finger irregularities comprising: a detecting means; and a noise component removing means for removing a noise component contained in a signal obtained by detecting each frequency from the oscillator detected by the detecting means. Emotion There is provided an input device.

Still further, according to the present invention, there are provided a plurality of input electrodes which are arranged at predetermined intervals along the longitudinal direction of a finger of a person to be measured and which are in contact with a finger to be input with unevenness information along the arrangement direction. A single output electrode disposed at an end of the plurality of input electrodes along the length of the finger, the finger being in contact with the input electrode, and an output connected to the output electrode; 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. Detecting means for detecting each oscillation frequency; and noise component removing means for removing a noise component contained in a signal detected and detected for each frequency from the oscillator detected by the detecting means. There is provided an unevenness information input apparatus of a finger, characterized.

Still further, according to the present invention, a plurality of output electrodes 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 oscillator for selectively outputting a signal of an arbitrary range or a preset number of frequencies, connection means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes, A single input electrode disposed at an end of the finger along the longitudinal direction, wherein 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. Detecting means for obtaining characteristic information of a finger to be verified of the person to be authenticated, and removing a noise component included in a signal detected and detected for each frequency from the oscillator detected by the detecting means. Noise Removing means, storing means for storing feature information for comparison in advance, and comparing the feature information obtained by the noise component removing means with the feature information stored in the storage means, thereby obtaining the target information. And a determination unit for determining whether the person is an authenticator or another person.

Still further, according to the present invention, a plurality of input electrodes 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. A single output electrode disposed at an end of the plurality of input electrodes along the longitudinal direction of the finger, the finger being in contact with the input electrode, and an output connected to the output electrode; An oscillator for selectively outputting signals of a range or a number of preset frequencies, reading means for sequentially reading electric signals obtained from the plurality of input electrodes, and an oscillator for reading the electric signals read by the reading means. By detecting at each frequency at which oscillation occurs, a detecting means for obtaining characteristic information of a finger to be verified of the person to be authenticated, and a signal obtained by detecting at each frequency from the oscillator detected by the detecting means, Miscellaneous included Noise component removing means for removing components, storage means for storing feature information to be compared in advance, and matching of feature information obtained by the noise component removing means with feature information stored in the storage means. By doing so, there is provided a personal authentication device, comprising: a determination unit for determining whether the person to be authenticated is the person himself or another person.

[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 the finger of each person to be authenticated, that is, characteristic information for collation is written and registered in the card 4 or,
It comprises a read / write device 3 for reading the characteristic information for verification registered in the C card 4.

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 in detail later with reference to FIG. 18, 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 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 the individual output electrodes 23.

Hereinafter, the output of the output electrode 23 is
The 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.

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 above-described oscillator 2 is connected to the output electrode 23.
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.

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, step S3
, The projection signal V of the finger 22 using the pattern input unit 1
Import (i).

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,

[0054]

(Equation 1) and

[0055]

(Equation 2) Is used, the dictionary information Vd (i) read from the data memory 12 of the IC card 4 is aligned with 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,

[0059]

(Equation 3) and

[0060]

(Equation 4) Is used to calculate the dissimilarity E. Note that N in equations (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 the 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 determined by 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, in step S5, the degree of difference E obtained as described above is determined 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 schematic diagram schematically showing a configuration of a personal authentication device according to the second embodiment of the present invention. In FIG. 8, since 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 of the first embodiment shown in FIGS. 1 to 7, the description is omitted, and the pattern input is omitted. The characteristic part of the configuration of the unit 1 will be described.

In the personal authentication device shown in FIG. 8, the output electrode 23 and the input electrode 24 of the linear electrode array 21 are arranged at a predetermined distance. 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.

FIG. 9 is a schematic diagram schematically showing the configuration of a personal authentication device according to the third embodiment of the present invention. In FIG. 9 as well, 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 of the first embodiment shown in FIGS. The features of the configuration of the input unit 1 will be described.

In the third embodiment, the personal authentication device shown in FIG. 9 has oscillators 27-1 and 27-2 connected to output electrodes 23, respectively.
7-2,..., And each of the oscillators 27-1, 27-
,... Are turned on and off by the timing pulse from the timing pulse generator 26. Even in this case, the same operation and effect as those of the first embodiment can be obtained.

FIG. 10 is a schematic diagram schematically showing a configuration of a personal authentication device according to the fourth embodiment of the present invention.
In FIG. 10, 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 of 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. 10 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, and in parallel with the input electrodes 24. 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.
At intervals of 10 mm, about 250 pieces (that is, about 50 m
m) are arranged. The number of the input electrodes 24, that is, the length of the finger 22 of the linear electrode array 21 in the longitudinal direction is usually set to a length completely including the second joint from the tip of the finger 22.

Each input electrode 24 is connected to one end of an analog switch group 25.

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

Each input electrode 24 is connected to the analog switch group 2
5 are connected together to a terminating resistor 28, and a potential difference generated at both ends of the terminating resistor 28 is detected by a detection circuit 29. The output of the detection circuit 29 is A / D
It is converted into a digital signal by the converter 30.

In this manner, similarly to the first embodiment of the pattern input section 1 shown in FIG. 3, a stable projection signal which is not affected by the state of the surface of the finger 22 (such as the presence or absence of perspiration) can be obtained. Obtainable.

FIG. 11 is a schematic diagram schematically showing a configuration of a personal authentication device according to the fifth embodiment of the present invention.
In FIG. 11 as well, 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 of the first embodiment shown in FIGS. The features of the configuration of the input unit 1 will be described.

As shown in FIG. 11, the pattern input unit 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 parallel to 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.

FIG. 12 is a schematic diagram showing a modification of the first embodiment of the pattern input section shown in FIG. In addition,
12, 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. 12, 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 is connected to one end of an analog switch group 25.

The analog switch group 25 is driven by the timing pulse output from the timing pulse generator 26 to, for example, 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 the 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 terminal resistor 28 via a power supply unit or a device body (not shown), and is connected to an input terminal of a detection circuit 29 via a BPF (bandpass filter unit) 31. ing. Note that the BPF 31 uses a single bandpass filter having a fixed passband characteristic, as will be described in detail later with reference to FIG. 19, but can handle a plurality of frequencies.

The output of the detection circuit 29 is supplied to the A / D converter 30
Is input to

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 (bandpass filter unit) 31 allows only a signal in a predetermined band to pass therethrough, so that unwanted noise from the outside can be more effectively removed. , A more stable projection signal can be obtained.

FIG. 13 is a schematic diagram showing a modification of the third embodiment of the pattern input section shown in FIG. In addition,
13, the same elements as those shown in FIG. 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 13, 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 a number of predetermined frequencies.

The input electrode 24 is grounded via 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 (bandpass filter unit) 31. ing. Note that the BPF 31 uses a single bandpass filter having a fixed passband characteristic, as will be described in detail later with reference to FIG. 19, but can handle a plurality of frequencies.

FIG. 14 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. 14, the same elements as those shown in FIG. 10 are denoted by the same reference numerals, and detailed description will be omitted.

The personal authentication device shown in FIG. 14 has a linear electrode array 21 composed of a plurality of strip 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.

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 terminating resistor 28 via a power supply unit or a device body (not shown), and input to a detection circuit 29 via a BPF (bandpass filter unit) 31. Connected to the end. The output of the detection circuit 29 is converted into a digital signal by the A / D converter 30. In addition, BPF31
Uses a single bandpass filter having a fixed passband characteristic, as will be described in detail later with reference to FIG. 19, but can handle a plurality of frequencies.

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

In the pattern input section shown in FIGS. 3, 8 to 14, 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. For this reason, finger 2
When 2 and 22a are wet or sweaty, the output of projection signal V (i) tends to fluctuate greatly.

FIG. 15 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).

As shown in FIG. 15, 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. 15 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 unit will be described. The pattern input unit shown in FIG. 16 includes a plurality of output electrodes 23 arranged at regular intervals in, for example, a matrix of 3 rows × 5 columns, and each output electrode 2.
At intervals substantially equal to the intervals at which 3 are arranged, for example, 1 row × 5
It has input electrodes 24 arranged in a matrix of columns. Note that each output electrode 23 is connected to the analog switch group 25 shown in FIG.

In FIG. 16, 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. 17 shows a configuration in which the input electrodes and the output electrodes in the pattern input section shown in FIG. 16 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. An oscillator 27 shown in FIG. 18 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.

FIG. 18 is a schematic block diagram showing an example of a variable oscillation frequency type oscillator that can be used in each of the pattern input sections shown in FIGS. 3, 8, and 14.

As shown in FIG. 18, 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 and a frequency divider 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. 19 is a schematic block diagram showing an example of a BPF unit usable for each of the pattern input units shown in FIGS.

As shown in FIG. 19, 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 a signal for outputting a signal oscillated by the fundamental frequency oscillator 63 as a frequency signal having a difference between the input frequencies. The frequency oscillated by the fundamental frequency generator 63 is set to an arbitrary range or to some predetermined frequency. 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. 20 is a flowchart showing an example of a flow for specifying a person to be authenticated by the pattern input unit shown in FIG. 3 and the authentication device shown in FIG.

As shown in FIG. 20, first, the frequency of the signal oscillated by the oscillator 27 is set. Subsequently, the signal V (i) of the finger of the person to be authenticated is sequentially measured in accordance with the signal processing timing described with reference to FIG.

Next, only the noise component is measured, for example, by measuring the projection signal when the finger touches only the input electrode. Further, by calculating the average level of the projection signal, it is possible to determine the magnitude of noise mixed in from the finger. In addition, the finger is brought into contact with the output electrode and the input electrode in the same manner as when measuring the projection signal of a normal finger, and the projection signal is measured with the output of the oscillator 27 turned off.
Only noise can be measured.

Subsequently, the above-described detection of the projection signal and measurement of the noise are repeated for all frequencies that can be provided by the oscillator 27.

Hereinafter, a frequency at which the measured noise is determined to be minimum is obtained, and a V (i) output, that is, a projection signal as shown in FIG. 5 is obtained from the signal V (i) measured at that frequency. .

Next, the difference E described with reference to FIG. 7 and the equations (2) to (5) is obtained, and a predetermined threshold level TH is compared with the difference E, as described above. , “E ≦ TH” is satisfied, the person to be authenticated is authenticated as the principal.

FIG. 21 is a flowchart showing an example of authentication different from the flow for specifying a person to be authenticated shown in FIG.

As shown in FIG. 21, first, the frequency of the signal oscillated by the oscillator 27 is set. Subsequently, the signal V (i) of the finger of the person to be authenticated is sequentially measured.

Next, the difference E described with reference to FIG. 7 and the equations (2) to (5) is obtained, and the above-described detection of the projection signal for all frequencies that can be provided by the oscillator 27 and the difference The calculation of E is repeated.

In the following, the frequency at which the calculated difference E is determined to be the minimum is obtained, and the difference E measured at that frequency is compared with a predetermined threshold level TH. If “E ≦ TH” is satisfied, the person to be authenticated is authenticated as the principal.

FIG. 22 is a flowchart showing an example of a flow for specifying a measurable condition used when specifying a person to be authenticated.

In FIG. 22, first, the frequency of the signal oscillated by the oscillator 27 is set, and the signal V (i) of the finger of the person to be authenticated is measured in order.

Next, only a noise component is measured, for example, by measuring a projection signal when a finger touches only the input electrode.

Subsequently, the above-described detection of the projection signal and measurement of the noise are repeated for all the frequencies that can be provided by the oscillator 27.

Hereinafter, it is determined whether or not the magnitude of the noise exceeds a predetermined threshold level TH2 at all frequencies. If “measured noise level ≧ TH2”, the measurement is temporarily stopped, All the steps are repeated again.

In the step shown in FIG. 22, in order to reduce the influence of extraneous noise existing in the daily life, when the noise level exceeds a predetermined value, the projection signal V
It is useful to temporarily stop the measurement of (i) to increase the authentication accuracy. Since the magnitude of the external noise (noise level) changes every moment, in many cases, the projection signal V (i) is obtained by repeating all the steps again.

FIG. 23 is a flowchart showing an example of another authentication different from the flow for specifying the person to be authenticated shown in FIG.

In the flow shown in FIG. 20, first,
The frequency of the signal oscillated by the oscillator 27 is set. Subsequently, the signal V (i) of the finger of the person to be authenticated is sequentially measured in accordance with the signal processing timing described with reference to FIG.

Next, only the noise component is measured, for example, by measuring the projection signal when the finger touches only the input electrode.

Subsequently, the above-described detection of the projection signal and measurement of the noise are repeated for all frequencies that can be provided by the oscillator 27.

Hereinafter, it is determined whether or not the magnitude of the noise exceeds a predetermined threshold level TH2 at all the frequencies. If “measured noise level ≧ TH2”, the measurement is temporarily stopped or All the steps are repeated again.

“Measured noise level ≦ TH2”
When a measurement result that satisfies is satisfied, a frequency at which the measured noise is determined to be minimum is obtained, and V as shown in FIG. 5 is obtained from the signal V (i) measured at that frequency.
(I) An output, that is, a projection signal is obtained.

Next, the difference E described with reference to FIG. 7 and the equations (2) to (5) is obtained, and a predetermined threshold level TH is compared with the difference E, as described above. , “E ≦ TH” is satisfied, the person to be authenticated is authenticated as the principal.

[0134]

As described in detail above, according to the present invention,
It is possible to provide a finger unevenness information input device and a personal authentication device that are hardly affected by a change in the state of the finger surface such as sweating and that can improve the personal authentication ability.

Further, when detecting the unevenness information of the finger, a plurality of different frequencies are used, and the degree of difference is obtained from the output signal having the lowest noise level, so that it is determined whether or not the person to be authenticated is the person. Thus, highly accurate personal authentication becomes possible.

[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;

FIG. 8 is a block diagram showing a configuration of a pattern input unit of a personal authentication device according to a second embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a pattern input unit of a personal authentication device according to a third embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a pattern input unit of a personal authentication device according to a fourth embodiment of the present invention.

FIG. 11 is a schematic diagram showing a modification of the second embodiment of the pattern input unit of the present invention shown in FIG. 8;

FIG. 12 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. 13 is a schematic diagram showing a modification of the third embodiment of the pattern input unit of the present invention shown in FIG. 9;

FIG. 14 is a schematic diagram showing a modification of the fourth embodiment of the pattern input unit of the present invention shown in FIG. 10;

FIG. 15 is a schematic diagram showing a side view of a pattern input unit capable of reducing fluctuation of an output signal output from the pattern input unit shown in FIGS. 3, 8 to 14;

FIG. 16 is a schematic diagram illustrating another embodiment of the output electrode and the input electrode of the pattern input unit shown in FIGS. 3, 8 to 14.

FIG. 17 is a schematic diagram illustrating another embodiment of the output electrode and the input electrode of the pattern input unit shown in FIGS. 3, 8 to 14.

FIG. 18 is a schematic block diagram showing an example of a variable oscillation frequency oscillator that can be used for each pattern input unit shown in FIGS. 3, 8, and 14;

FIG. 19 is a schematic block diagram showing an example of a BPF unit that can be used for each pattern input unit shown in FIGS. 12 to 14;

20 is a flowchart showing an example of a flow for specifying a person to be authenticated by the pattern input unit shown in FIG. 3 and the authentication device shown in FIG. 1;

FIG. 21 is a flowchart illustrating an example of authentication different from the flow of specifying a person to be authenticated illustrated in FIG. 20;

FIG. 22 is a flowchart illustrating an example of a flow for specifying a measurable condition used when specifying a person to be authenticated.

FIG. 23 is a flowchart illustrating an example of still another authentication different from the flow of specifying a person to be authenticated illustrated in FIG. 20; [Brief description of drawings]

[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)

Claims (17)

[Claims] 1. A plurality of output electrodes arranged along a longitudinal direction of a finger of a person to be measured at predetermined intervals, and a plurality of output electrodes to be contacted with a finger to be input with unevenness information along the arrangement direction; An oscillator for selectively outputting signals of several preset frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; and a longitudinal direction of the fingers of the plurality of output electrodes A single input electrode disposed at the end, the finger being in contact with the output electrode, and a detecting means for detecting an electric signal obtained from the input electrode for each frequency at which the oscillator oscillates. An unevenness information input device for a finger, comprising: 2. A plurality of input electrodes which are arranged at predetermined intervals along the longitudinal direction of the finger of the subject, and which are in contact with a finger to which irregularity information is to be input along the arrangement direction; A single output electrode disposed at a longitudinal end of a finger of the electrode, wherein the finger is brought into contact with the input electrode; and an output connected to the output electrode, an arbitrary range or a preset range. 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 finger irregularity information input device, comprising: a detection means for detecting. 3. The apparatus according to claim 1, further comprising band limiting means provided on an input side of said detecting means, having an oscillation frequency of said oscillator in a pass band, and limiting a band of an input electric signal. 3. The finger unevenness information input device according to 1 or 2. 4. An output electrode or an input electrode arranged at a predetermined interval along a longitudinal direction of a finger of a subject is divided into a plurality of electrodes in a direction orthogonal to a longitudinal direction of the finger of the subject. The finger unevenness information input device according to any one of claims 1 to 3, wherein the finger unevenness information input device is arranged. 5. A plurality of output electrodes which are arranged at predetermined intervals along the longitudinal direction of the finger of the subject and are contacted by a finger to which irregularity information is to be input along the arrangement direction; An oscillator for selectively outputting signals of several predetermined frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; and a part of the body of the subject to be contacted. A finger unevenness information input device, comprising: a single input electrode provided; and a detecting means for detecting an electric signal obtained from the input electrode for each frequency oscillated by the oscillator. 6. A plurality of input electrodes which are arranged at predetermined intervals along the longitudinal direction of the finger of the person to be measured and which are in contact with a finger to input unevenness information along the arrangement direction, A single output electrode in which a part of the body is disposed so as to be contactable; an oscillator having an output connected to the output electrode, for selectively outputting a signal of an arbitrary range or several frequencies set in advance; A reading unit for sequentially reading each electric signal obtained from the plurality of input electrodes; and a detecting unit for detecting the electric signal read by the reading unit for each frequency oscillated by the oscillator. Finger unevenness information input device. 7. 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; Or an oscillator for selectively outputting signals of several preset frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; and a longitudinal direction of the fingers of the plurality of output electrodes. A single input electrode, which is disposed at an end portion along which the finger is in contact with the output electrode, and detects an electric signal obtained from the input electrode for each frequency of oscillation of the oscillator, so that Detection means for obtaining characteristic information of a finger to be verified by a verifier; storage means for storing characteristic information for verification in advance; characteristic information obtained by the detection means and characteristics stored in the storage means Match information It allows the personal authentication apparatus characterized by comprising a determining means for determining said a stranger or a person to be authenticated himself. 8. 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 which are in contact with the finger to be verified of the person to be authenticated along the arrangement direction; A single output electrode disposed at a longitudinal end of a finger of the input electrode, wherein the finger is brought into contact with the input electrode; and an output connected to the output electrode, an arbitrary range or a preset range. An oscillator for selectively outputting signals of several frequencies, reading means for sequentially reading electric signals obtained from the plurality of input electrodes, and an electric signal read by the reading means for each frequency at which the oscillator oscillates. Detecting means for obtaining characteristic information of the finger to be verified by the detection target; storage means for storing characteristic information for verification in advance; and the characteristic information obtained by the detection means Stored in storage means Was by collating the feature information, the personal authentication apparatus characterized by comprising a determining means for determining said a stranger or a person to be authenticated himself. 9. The apparatus according to claim 1, further comprising a band limiting means provided on an input side of said detecting means, having an oscillation frequency of said oscillator in a pass band, and limiting a band of an input electric signal. 9. The personal authentication device according to 7 or 8. 10. An output electrode or an input electrode arranged at a predetermined interval along the longitudinal direction of a finger of a person to be authenticated is divided into a plurality of electrodes in a direction orthogonal to the longitudinal direction of the finger of the person to be authenticated. The personal authentication device according to claim 7, wherein the personal authentication device is arranged in a row. 11. A plurality of output electrodes which are arranged at predetermined intervals along the longitudinal direction of the finger of the person to be measured and which are in contact with a finger to which irregularity information is to be input along the arrangement direction; An oscillator for selectively outputting signals of several preset frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; and a longitudinal direction of the fingers of the plurality of output electrodes A single input electrode disposed at the end of the input electrode, the finger being in contact with the output electrode, and a detecting means for detecting an electric signal obtained from the input electrode for each frequency at which the oscillator oscillates. A finger unevenness information input device, comprising: noise component removing means for removing a noise component included in a signal obtained by detecting each frequency from the oscillator detected by a detecting means. 12. A plurality of input electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the subject to be measured, and a plurality of input electrodes to be contacted by a finger to input unevenness information along the arrangement direction; A single output electrode disposed at a longitudinal end of a finger of the electrode, wherein the finger is brought into contact with the input electrode; and an output connected to the output electrode, an arbitrary range or a preset range. 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 finger comprising: detecting means for detecting; and noise component removing means for removing a noise component contained in a signal obtained by detecting each frequency from the oscillator detected by the detecting means. Concave Information input device. 13. 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; Or an oscillator for selectively outputting signals of several preset frequencies; connecting means for sequentially switching and connecting the output of the oscillator to the plurality of output electrodes; and a longitudinal direction of the fingers of the plurality of output electrodes. A single input electrode, which is disposed at an end portion along which the finger is in contact with the output electrode, and detects an electric signal obtained from the input electrode for each frequency of oscillation of the oscillator, so that Detecting means for obtaining characteristic information of a finger to be verified by a verifier; noise component removing means for removing a noise component included in a signal detected and detected for each frequency from the oscillator detected by the detecting means; , Oh A storage unit for storing characteristic information for first-time verification, and comparing the characteristic information obtained by the noise component removing unit with the characteristic information stored in the storage unit, whereby the person to be authenticated is identified. And a determination unit for determining whether the user is another person. 14. A plurality of input electrodes arranged at predetermined intervals along the longitudinal direction of the finger of the 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 disposed at a longitudinal end of a finger of the input electrode, wherein the finger is brought into contact with the input electrode; and an output connected to the output electrode, an arbitrary range or a preset range. An oscillator for selectively outputting signals of several frequencies, reading means for sequentially reading electric signals obtained from the plurality of input electrodes, and an electric signal read by the reading means for each frequency at which the oscillator oscillates. Detecting means for obtaining characteristic information of the finger to be verified by the authenticated person, and a noise component included in a signal obtained by detecting each frequency from the oscillator detected by the detecting means. Miscellaneous to remove A component removing unit, a storage unit for storing feature information to be compared in advance, and comparing feature information obtained by the noise component removing unit with feature information stored in the storage unit, thereby A personal identification device comprising: a determination unit configured to determine whether the user is the authenticated person or another person. 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 electrical signal is detected for each of the frequencies, the magnitude of the noise component included in the detected signal for each of the frequencies is measured, and the magnitude of the noise component among the detection outputs of the signals of all the frequencies is measured. An authentication method characterized in that a finger projection signal is obtained from a signal of a small frequency and compared with a finger projection signal registered in advance. 16. 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 for each frequency, a projection signal of a finger is obtained from each of the detected signals for each frequency, a signal having a frequency with the smallest difference is extracted, and a finger registered in advance is extracted. An authentication method characterized by comparing with a projection signal. 17. A signal of an arbitrary range or several preset 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 electrical signal is detected for each frequency, and the magnitude of a noise component included in the detected signal for each frequency is measured. When the magnitude of the measured noise component is larger than a predetermined level, The measurement is temporarily stopped, and at a predetermined timing, signals of an arbitrary range or several frequencies set in advance are supplied to the output electrode again in a predetermined order and selectively, and the signals of each frequency are Each of the subject The signal is taken in using the input electrode in a state where the signal is interposed and detected for each frequency, and the magnitude of the noise component included in the detected signal for each frequency is measured. An authentication method comprising: obtaining a finger projection signal from a signal having a frequency of the smallest noise component among the signals; and comparing the finger projection signal with a finger projection signal registered in advance.