JP2774313B2 - Biological identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] Regarding a biometric identification device, an object of the present invention is to provide a biometric identification device capable of realizing a thinner body in response to a stricter demand for a thinner device. Utilizing the fact that the color of the finger surface changes due to the pressing force when pressing the finger, light is emitted from the light source to the finger through the transparent body and reflected, and the finger is placed on the living body based on the change in the reflectance of the reflected light. In a biometric identification device having a biometric identification function for identifying whether or not a light source, a light source, a light receiving element, an imaging element, and a wavelength selection element are arranged above the lower surface of the transparent body opposite to the upper side on which a finger is pressed. The light guide means and the light deflecting means are arranged below the lower surface of the transparent body, or by utilizing the fact that the color of the finger surface changes due to the pressing force when the finger is pressed on the transparent body, from the light source. Irradiate the finger with light through the transparent body and reflect it, In a biometric identification device having a biometric identification function for identifying whether or not a finger is a living organism based on a change in reflectance of emitted light, a light source is provided above a lower surface of a transparent body opposite to an upper surface on which the finger is pressed. , A light receiving element and an imaging element are arranged, and a light guide means and a light deflecting means having wavelength selectivity are arranged below the lower surface of the transparent body, or a pressing force when a finger is pressed on the transparent body. Illuminates and reflects light from the light source through the transparent body to the finger using the change in the color of the finger surface, and identifies whether the finger is a living body based on the change in reflectance of the reflected light In a biometric identification device having a biometric identification function, a light source and a light receiving element are arranged above a lower surface of a transparent body opposite to an upper surface on which a finger is pressed, and an optical fiber, a magnifying lens, and a condenser lens are provided below a lower surface of the transparent body. Place the transparent body above and below the transparent body Configured to position the wavelength selection element on either side downward.

[Industrial applications]

The present invention relates to a biometric identification device, which can be applied to a biometric identification device used in a personal identification system using a fingerprint, and particularly relates to a biometric identification device capable of realizing a thin device.

In recent years, with the introduction of information systems into society,
There is an interest in how to secure system integrity (security). Until now, personal identification means when entering an information room such as a computer room or using an information system such as a terminal have generally been based on an ID card or a personal identification number. However, ID cards have the risk that counterfeit cards can be created by duplicating magnetic information, and PINs are usually easy to remember, such as the date of birth, etc. The problem has been pointed out.

Fingerprints, on the other hand, are considered to be the most powerful means of personal identification because they have two major characteristics: "everyone is unidentified" and "lifelong invariant". In recent years, simple personal verification systems using fingerprints have been widely used. R & D is underway.

The personal verification system using a fingerprint here usually generates a data for verification from a so-called fingerprint sensor (input device) which reads a fingerprint image as an image and converts it into an image signal, and an image signal read by the fingerprint sensor. And a processing device for registering the registered data and comparing the image signal read by the fingerprint sensor at the time of collation with the data for collation to determine whether or not the user is the principal.

[Conventional technology]

 Hereinafter, the related art will be described.

5 (a) and 5 (b) are schematic diagrams showing the configuration of a fingerprint sensor disclosed in Japanese Patent Application No. 63-155670 already filed by the present applicant.

In this figure, reference numeral 31 denotes a transparent body made of a translucent member such as glass, and the upper surface 31a and the lower surface 31b against which the finger 32 is pressed are formed in a parallel plate shape. 33 is a light source for irradiation, 32 is an aperture stop mounted on one side of a transparent body 31, 35 is a spherical lens mounted on an aperture stop 34, 36 is a transparent body 31
A mirror mounted on one side, 37 is a light receiver such as a CCD.

Here, a fingerprint unique to each person is formed on the finger 32 of the human body, and this fingerprint is formed by a convex ridge 32a and a concave valley 32b.
Consisting of

 Next, the inspection method will be described.

As shown in FIGS. 5A and 5B, a finger 32 is
When the finger 32 is irradiated from the light source 33 through the transparent body 31, the ridge 32a of the fingerprint (specifically, the part where the ridge 32a is in contact with the upper surface 31a of the transparent body 31) The component totally reflected by the lower surface 31b of the transparent body 31 as shown by the arrow A in the scattered light is further reflected by the mirror. Next, the light reflected by the mirror 36 and passing through the transparent body 31 is passed through the aperture stop 34 and is imaged on the light receiver 37 by the spherical lens 35. Here, among the ridges 32a and valleys 32b of the fingerprint, only the information of the ridges 32a is detected, and the information of the valleys 32b is not detected. In this case, since there is an air layer, the air passes through the transparent body 31 as shown by the arrow B and directly passes to the outside. Then, the image data of the obtained fingerprint image is compared with the data for collation to identify whether or not the image belongs to the person (person).

By the way, when a so-called replica (for example, a copy made of rubber or the like) obtained by copying a fingerprint of a specific individual who has already been registered is pressed against such a fingerprint sensor and the measurement is similarly performed, the person (human) is received from the light receiver 37. In this case, the same gray-scale image signal as that of the finger is output, and the replica is determined to be the person himself.

In order to solve the above-mentioned problem, it is known that a function of identifying a human finger, that is, a living body is solved by a living body identification device provided in a fingerprint sensor. Hereinafter, a specific description will be given with reference to the drawings.

6 and 7 are views for explaining the biometric identification device of Japanese Patent Application No. 63-298922, which has already been filed by the present applicant. FIG. 6 is a schematic diagram showing the configuration of the biometric identification device. The figure shows the relationship between the wavelength and the relative reflectance during ischemia and hyperemia.

In these figures, the same reference numerals as those in FIG. 5 denote the same or corresponding parts, 41 is a condenser lens, 42 is a filter that passes only green light, and 43 is a photodetector such as a phototransistor.

Here, a light source 33, a condenser lens 41, a filter 42, and a photodetector 43 are arranged below the lower surface 31b of the transparent body 31.

Next, a method of detecting whether the finger 32 is a human finger will be described.

The detection method here utilizes the fact that the color of the surface of the finger 32 changes from flesh color to white due to the pressing force when the finger 32 is pressed against the upper surface 31a of the transparent body 31, and from the light source 33 through the transparent body 31. Light is applied to the finger 32 to reflect the light, and a living body identification function is newly added so as to identify whether the finger 32 is a living body based on the distribution of the reflectance change of the reflected light.

Specifically, first, as shown in FIG.
Light including green light from a light source 33 disposed below 31b is applied to the finger 32 via the transparent body 31 to be reflected, and the reflected light is transmitted again through the transparent body 31. Next, the transparent body
The light that has passed through 31 is condensed by a condenser lens 41 and passed through a filter 42 that passes only light in the green range, and a light detector 43 detects a change in the amount of green light that has passed through the filter 42. Here, the change in the amount of green light from immediately before the finger 32 is pressed against the transparent body 31 until the finger 32 is completely pressed is measured.

If the change in the amount of green light measured in this way indicates a change in the green range (wavelength 500 to 550 mm) shown in FIG. 7, it can be determined that the finger is a real human finger, and is shown in FIG. If it does not show a change in the green range, it can be determined that the finger is not a real human finger.

[Problems to be solved by the invention]

However, in the conventional biometric identification device shown in FIG. 6, the light source 33 and the condenser lens 4 are provided below the lower surface 31b of the transparent body 31 opposite to the upper surface 31a on which the finger 32 is pressed.
1. Since the filter 42 and the photodetector 43 are arranged, there is a problem that the thickness of the device is hindered. Specifically, in the living body identification device having this configuration, there is a limit in reducing the distance (X1 shown in FIG. 6) from the lower surface 31b of the transparent body 31 to the lower surface of the photodetector 43, and about 2 cm is absolutely necessary. . For this reason, it was not possible to respond to the demand for even thinner thinning. The photodetector 43 is usually disposed at the lowest position from the lower surface 31b of the transparent body 31.

Therefore, an object of the present invention is to provide a biometric identification device capable of realizing a thinner device in response to a stricter demand for a thinner device.

[Means for solving the problem]

In order to achieve the above object, the biometric identification device according to the first aspect of the present invention utilizes the fact that the color of the surface of the finger changes due to the pressing force when the finger is pressed on the transparent body. Irradiate and reflect, in a biometric identification device with a biometric identification function to identify whether the finger is a living body based on the change in reflectance of the reflected light, the opposite side of the upper surface side against which the finger is pressed A light source, a light receiving element, an imaging element, and a wavelength selection element are arranged above the lower surface of the transparent body, and a light guide means and a light deflecting means are arranged below the lower surface of the transparent body.

In order to achieve the above object, the biometric identification device according to the second invention utilizes the fact that the color of the finger surface is changed by the pressing force when the finger is pressed on the transparent body, and the light is emitted from the light source to the finger through the transparent body. Irradiate and reflect, in a biometric identification device with a biometric identification function to identify whether the finger is a living body based on the change in reflectance of the reflected light, the opposite side of the upper surface side against which the finger is pressed A light source, a light receiving element and an imaging element are arranged above the lower surface of the transparent body, and a light guide means and a light deflecting means having wavelength selectivity are arranged below the lower surface of the transparent body.

In order to achieve the above object, the biometric identification device according to the third aspect of the present invention utilizes the fact that the color of the finger surface is changed by the pressing force when the finger is pressed on the transparent body, and the light is emitted from the light source to the finger through the transparent body. Irradiate and reflect, in a biometric identification device with a biometric identification function to identify whether the finger is a living body based on the change in reflectance of the reflected light, the opposite side of the upper surface side against which the finger is pressed A light source and a light receiving element are arranged above the lower surface of the transparent body, an optical fiber, a magnifying lens, and a condenser lens are arranged below the lower surface of the transparent body, and a wavelength selection element is arranged above or below the transparent body. Is what you do.

[Action]

In the first invention, as shown in FIG. 1, a light source 33, a condenser lens 41, a filter 42, and a semi-transparent mirror 3 (semi-transparent mirror 3) are provided above a lower surface 31b of a transparent body 31 opposite to an upper surface 31a on which a finger 32 is pressed. A transparent parallel plate 1 and mirrors 2a and 2b may be arranged below the lower surface 31b of the transparent body 31.
Are arranged.

Accordingly, in the conventional device shown in FIG. 6, the distance X1 from the lower surface 31b of the transparent body 31 to the lower surface of the photodetector 43 was about 2 cm, whereas the distance from the lower surface 31b of the transparent body 31 to the lower surface of the transparent parallel plate 1 was small. (X2 shown in FIG. 1) can be reduced to about 5 mm, and a thinner device can be realized in response to a stricter demand for a thinner device.

In the second invention, as shown in FIG. 2, a light source 33, a photodetector 43, and a condenser lens 41 are arranged above a lower surface 31b opposite to the upper surface 31a on which the finger 32 is pressed, and Lower surface 31
b, a transparent parallel plate 11 and reflection holograms 12a and 12b having wavelength selectivity are arranged below.

Therefore, in the conventional device shown in FIG.
While the distance X1 from the lower surface 31b to the lower surface of the photodetector 43 was about 2 cm, the reflection hologram 1
The distance to the lower surfaces 2a and 12b can be reduced to about 2 to 3 mm, and a thinner device can be realized in response to a more stringent demand for a thinner device.

In the third invention, as shown in FIG. 3, a light source 33, a photodetector 43, and a filter 42 are disposed above a lower surface 31b of a transparent body 31 opposite to an upper surface 31a on which a finger 32 is pressed. 31
The optical fibers 21a and 21b, the magnifying lens 22, and the condenser lens 41 are arranged below the lower surface 31b.

Therefore, in the conventional device shown in FIG. 6, the distance X1 from the lower surface 31b of the transparent body 31 to the lower surface of the photodetector 43 was about 2 cm, whereas the distance from the lower surface 31b of the transparent body 31 to the lower surface of the optical fiber 21b was reduced. The thickness can be reduced to about 5 mm, and the thickness can be reduced in response to a more stringent demand for a thinner device.

〔Example〕

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the biometric identification device according to the first invention.

5, the same reference numerals as those in FIGS. 5 and 6 denote the same or corresponding parts, and 1 denotes a transparent parallel flat plate, which corresponds to the light guide means of the first invention. 2a and 2b are mirrors corresponding to the light deflecting means of the first invention. 3 is a semi-transparent mirror.

The transparent parallel flat plate 1 has both ends cut obliquely, and mirrors 2a and 2b are deposited on the cut surface. light source
33, light detector 43 (corresponding to the light receiving element of the first invention),
A condenser lens 41 (corresponding to the imaging element of the first invention), a filter 42 (corresponding to the wavelength selection element of the first invention), and the semi-transparent mirror 3 are arranged above the lower surface 31b of the transparent body 31.

Next, a method of detecting whether the finger 32 is a human finger will be described.

Here also, as in the past, the color of the surface of the finger 32 is changed from flesh color to white by the pressing force when the finger 32 is pressed against the upper surface 31a of the transparent body 31, and from the light source 33 through the transparent body 31. Light is applied to the finger 32 to reflect it, and a living body identification function is added so as to identify whether the finger 32 is a living body based on the distribution of the change in the reflectance of the reflected light.

Specifically, first, as shown in FIG.
Light including green light from a light source 33 disposed above 31b is condensed by a condenser lens 41, is irradiated to a mirror 2a through a transparent parallel plate 1 and reflected, and the reflected light is reflected in the transparent parallel plate 1. And is reflected by the mirror 2b so as to irradiate in the direction of the finger 32. Next, the reflected light is applied to the finger 32 via the transparent body 31 to be reflected, and the reflected light is passed through the transparent body 31 again. Next, a mirror is passed through the transparent parallel plate 1.
2b to irradiate and reflect, and reflect the reflected light into a transparent parallel plate 1
The light passes through the inside and is reflected by the mirror 2a so as to irradiate in the semi-transparent mirror direction 3. Then, the light reflected by the semi-transparent mirror 3 is passed through a filter 42 that passes only the light in the green range, and a light detector 43 detects a change in the amount of green light passing through the filter 42. Here, similarly to the conventional case, the change in the amount of green light from immediately before the finger 32 is pressed against the transparent body 31 until the finger 32 is completely pressed is measured.

As described in the conventional example, the change in the amount of green light measured as described above is shown in FIG. 7 in the green region (wavelength 500 to 550 m).
If the change in m) is indicated, it can be determined that the finger is a real human finger, and if it does not indicate a change in the green area shown in FIG. 7, it can be determined that the finger is not a real human finger.

That is, in the above embodiment, as shown in FIG.
The light source 33, the filter 42, the condenser lens 41, the filter 42, and the semi-transparent mirror 3 (the semi-transparent mirror 3 may be omitted) above the lower surface 31b of the transparent body 31 opposite to the upper surface 31a on which the 32 is pressed. ) Is arranged to guide the light from the light source 33 to the finger 32 for irradiation, and to guide and irradiate the reflected light from the finger 32 to the light detector 43. Since the mirrors 2a and 2b are arranged, the distance X1 from the lower surface 31b of the transparent body 31 to the lower surface of the photodetector 43 in the conventional device shown in FIG.
The distance (X2 shown in FIG. 1) from the lower surface 31b to the lower surface of the transparent parallel flat plate 1 can be set to about 5 mm, and a thinner device can be realized in response to a stricter demand for a thinner device.

In the first invention, the most preferable mode for reducing the thickness of the apparatus is a light source 33, a filter 42, and a condenser lens 4.
1. The filter 42 and the semi-transparent mirror 3 may be arranged so as to be entirely contained within the thickness of the transparent body 31.

FIG. 2 is a schematic diagram showing the configuration of one embodiment of the living body identification device according to the second invention.

5, the same reference numerals as those in FIGS. 5 and 6 denote the same or corresponding parts, and 11 denotes a transparent parallel flat plate, which corresponds to the light guide means of the second invention. Reference numerals 12a and 12b denote reflection holograms having wavelength selectivity, which correspond to the light deflecting means having wavelength selectivity of the second invention.

The reflection holograms 12a and 12b are formed on the lower surfaces at both ends of the transparent parallel plate 11, and have wavelength selectivity, so that they can be configured without providing a filter as provided in the first invention. The light source 33, the light detector 43 (corresponding to the light receiving element of the second invention), and the condenser lens 41 (corresponding to the imaging element of the second invention) are arranged above the lower surface 31b of the transparent body 31.

Next, a method of detecting whether the finger 32 is a human finger will be described.

Here also, as in the past, the color of the surface of the finger 32 is changed from flesh color to white by the pressing force when the finger 32 is pressed against the upper surface 31a of the transparent body 31, and from the light source 33 through the transparent body 31. Light is applied to the finger 32 to reflect it, and a living body identification function is added so as to identify whether the finger 32 is a living body based on the distribution of the change in the reflectance of the reflected light.

Specifically, first, as shown in FIG.
Light including green light from a light source 33 disposed above 31b is condensed by a condenser lens 41, and is radiated to a reflection type hologram 12a through a transparent parallel plate 11 to emit only green light on the upper surface of the transparent parallel plate 11. Reflect as if it were totally reflected. At this time, since the reflection hologram 12a has wavelength selectivity that allows only the light in the green range, only the light in the green range is directed to the upper surface of the transparent parallel plate 11. Next, the light in the green region reflected by the reflection hologram 12a is totally reflected on the upper surface of the transparent parallel plate 11, irradiates the reflection hologram 12b, is reflected in the reflection hologram 12b in the vertical direction, and reflects the reflected light. The light is reflected by irradiating the finger 32 through the transparent body 31, and the light reflected from the finger 32 is again reflected on the transparent body 31.
Through. Next, the reflection type hologram 12b is irradiated through the transparent parallel plate 11 and reflected so as to be totally reflected on the upper surface of the transparent parallel plate 11, and the light totally reflected on the upper surface of the transparent parallel plate 11 is reflected on the reflection hologram 12a. Irradiate.
Then, the light is reflected in the vertical direction by the reflection hologram 12b, and the light detector 43 detects a change in the amount of green light.

Here, similarly to the conventional case, the change in the amount of green light from immediately before the finger 32 is pressed against the transparent body 31 until the finger 32 is completely pressed is measured.

As described in the conventional example, the change in the amount of green light measured as described above is shown in FIG. 7 in the green region (wavelength 500 to 550 m).
If the change in m) is indicated, it can be determined that the finger is a real human finger, and if it does not indicate a change in the green area shown in FIG. 7, it can be determined that the finger is not a real human finger.

That is, in the above embodiment, as shown in FIG.
A light source 33, a photodetector 43, and a condenser lens 41 are arranged above a lower surface 31b opposite to the upper surface 31a on which the 32 is pressed.
The lower surface 31 of the transparent body 31 in order to guide and irradiate light from the finger 33 to the finger 32 and guide and irradiate the reflected light from the finger 32 to the light detector 43
Since the transparent parallel plate 11 and the reflection type holograms 12a and 12b having wavelength selectivity are arranged below b, in the conventional device shown in FIG. 6, from the lower surface 31b of the transparent body 31 to the lower surface of the photodetector 43. While the distance X1 was about 2 cm, the distance from the lower surface 31 b of the transparent body 31 to the lower surface of the reflection holograms 12 a and 12 b can be set to about 2 to 3 mm. The thickness can be reduced.

In the second invention, the most preferable mode for making the device thinner is that the light source 33, the light detector 43, and the condenser lens
What is necessary is just to arrange so that 41 may entirely fit in the thickness of the transparent body 31.

FIG. 3 is a schematic diagram showing the configuration of one embodiment of the living body identification device according to the third invention.

In this figure, the same reference numerals as those in FIGS. 5 and 6 denote the same or corresponding parts, and reference numerals 12a and 12b denote optical fibers.
Of the invention of the invention. A magnifying lens 22 for magnifying light corresponds to the magnifying lens of the third invention.

The light source 33, the light detector 43, and the filter 42 are disposed above the lower surface 31b of the transparent body 31.

Next, a method of detecting whether the finger 32 is a human finger will be described.

Here also, as in the past, the color of the surface of the finger 32 is changed from flesh color to white by the pressing force when the finger 32 is pressed against the upper surface 31a of the transparent body 31, and from the light source 33 through the transparent body 31. Light is applied to the finger 32 to reflect it, and a living body identification function is added so as to identify whether the finger 32 is a living body based on the distribution of the change in the reflectance of the reflected light.

Specifically, first, as shown in FIG.
Light including green light from a light source 33 disposed above 31b is guided to a magnifying lens 22 via an optical fiber 21a, magnified by the magnifying lens 22, and irradiates a finger 32 via a transparent body 31 to be reflected.
Next, the light reflected by the finger 32 is condensed by the condensing lens 41 through the transparent body 31, guided to a filter 42 that allows only light in the green region to pass through the optical fiber 21b, and passed through the filter 42. The light detector 43 detects a change in the amount of green light that has been emitted.

Here, similarly to the related art, the amount of change in green light from immediately before the finger 32 is pressed against the transparent body 31 until the finger 32 is completely pressed is measured.

As described in the conventional example, the change in the amount of green light measured as described above is shown in FIG. 7 in the green region (wavelength 500 to 550 m).
If the change in m) is indicated, it can be determined that the finger is a real human finger, and if it does not indicate a change in the green area shown in FIG. 7, it can be determined that the finger is not a real human finger.

That is, in the above embodiment, as shown in FIG.
The light source 33, the photodetector 43, and the filter 42 are arranged above the lower surface 31b of the transparent body 31 on the side opposite to the upper surface 31a side on which the 32 is pressed, and the light from the light source 33 is guided to the finger 32 to irradiate it. Transparent body to guide the reflected light from
Since the optical fibers 21a and 21b, the magnifying lens 22 and the condenser lens 41 are arranged below the lower surface 31b of the transparent body 31, the light detector 43 is provided in the conventional device shown in FIG.
While the distance X1 to the lower surface was about 2 cm, the transparent body 3
(1) The distance from the lower surface 31b to the lower surface of the optical fiber 21b can be set to about 5 mm, and a thinner device can be realized in response to a more stringent demand for a thinner device.

In the third aspect, the light source 33, the photodetector 43, and the filter 42 may be arranged so as to fit all within the thickness of the transparent body 31 as the most preferable mode for reducing the thickness of the device.

In the above embodiment, as shown in FIG.
The case where the filter 42 is provided on the upper side and a preferred embodiment for thinning has been described. However, the third invention is not limited to this, and the filter 42 is provided between the transparent body 31 and the condenser lens 41. In this case, the device may be thinner, but inferior to the above-described embodiment, but can be thinner than the conventional device.

In the first to third inventions, as shown in FIG. 4, a gate sensor 25 for detecting that the finger 32 is about to be placed on the transparent body 31 may be provided. ON / OFF can be performed efficiently. In FIG. 4, reference numeral 26 denotes a light source, and 27 denotes a light receiving element.

In each embodiment of the first to third inventions described with reference to FIGS. 1 to 3, the light guide means and the light deflecting means are arranged directly below the lower surface of the transparent body. The light guide means and the light deflecting means may be formed obliquely and arranged in an oblique direction of the transparent body.

〔The invention's effect〕

According to the first to third aspects of the invention, there is an effect that the thickness can be reduced in response to a more stringent demand for a thinner device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an embodiment of a biometric identification device according to the first invention, FIG. 2 is a schematic diagram showing an embodiment of a biometric identification device according to the second invention, FIG. FIG. 4 is a schematic diagram illustrating an embodiment of the biometric identification device according to the third invention, FIG. 4 is a diagram illustrating another embodiment, FIG. 5 is a schematic diagram illustrating a configuration of a conventional fingerprint sensor, FIG. 6 is a schematic diagram showing the configuration of a conventional biometric identification device, and FIG. 7 is a diagram showing the relationship between the wavelength and the relative reflectance during ischemia and hyperemia. 1, 11 ... transparent parallel plate, 2a, 2b ... mirror, 12a, 12b ... reflection hologram, 21a, 21b ... optical fiber, 22 ... magnifying lens, 31 ... transparent body, 32 ... finger, 33 light source, 36 mirror, 41 condensing lens, 42 filter, 43 photodetector.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Ikeda 1015 Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-61-221883 (JP, A) JP-A-63-268074 (JP, A) JP-A-63-220372 (JP, A) JP-A-48-68535 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G06T 1/00 A61B 5 / Ten

Claims (4)

(57) [Claims] 1. A light source irradiates light to a finger through a transparent body and reflects the light by utilizing the fact that the color of the finger surface is changed by the pressing force when the finger is pressed on the transparent body. In a biometric identification device having a biometric identification function for identifying whether or not a finger is a living body based on a change in reflectance of a finger, a light source, a light-receiving element, A living body identification device, comprising: an imaging element and a wavelength selection element; and a light guide and a light deflecting unit below the lower surface of the transparent body. 2. The light guide means is constituted by a transparent parallel plate, and the light deflecting means is constituted by a mirror.
The biometric identification device according to claim 1. 3. A light source irradiates and reflects light on a finger from a light source through a transparent body by utilizing the fact that the color of the finger surface changes due to the pressing force when the finger is pressed onto the transparent body. In a biometric identification device having a biometric identification function for identifying whether or not a finger is a living body based on a change in reflectance of the finger, a light source, a light-receiving element, A living body identification device, comprising: an image forming element; and a light guide unit and a light deflecting unit having wavelength selectivity below the lower surface of the transparent body. 4. A light source irradiates light to a finger through a transparent body and reflects the light by utilizing the fact that the color of the finger surface changes due to the pressing force when the finger is pressed on the transparent body. A biometric identification device having a biometric identification function for identifying whether or not a finger is a living body based on a change in reflectance of the living body, wherein a light source and a light receiving element are provided above a lower surface of the transparent body opposite to an upper surface on which the finger is pressed. A biometric identification device, comprising: arranging an optical fiber, a magnifying lens, and a condensing lens below a lower surface of a transparent body; and arranging a wavelength selection element on one of an upper side of the lower side of the transparent body and a lower side of the lower side of the transparent body.