JP4929023B2 - Communication terminal device provided with finger vein authentication device - Google Patents

Description

  The present invention relates to a communication terminal device including a finger vein authentication device that acquires a finger vein image and uses it for personal authentication.

  Expectations for personal authentication technology are increasing from the viewpoint of the safe management of property and information. In particular, authentication methods using finger vein patterns that do not change personal information in the lifetime of a person are difficult and convenient to counterfeit. It is attracting attention in terms of sex and security. On the other hand, communication terminal devices such as mobile phones have not only communication but also high added functions such as a camera function and a payment function. Therefore, strengthening security is an important issue. In view of this point, it is important to add a finger vein authentication function to a communication terminal device, and to make the communication terminal device easy to use and have high authentication accuracy.

  With regard to the camera-equipped portable information terminal device having such an operator authentication function, in particular, when authenticating the operator with the authentication device mounted on the mobile phone, the operator's biometric information is photographed and authenticated. A camera-equipped portable information terminal device has been proposed (see, for example, Patent Document 1).

As another example, Patent Document 2 discloses a technique in which a non-contact sensor is disposed on the side surface of a portable information terminal and a hand approach is detected (see, for example, Patent Document 2).
JP 2006-311358 A JP 2004-259107 A

  However, the above-mentioned Patent Document 1 does not describe a finger placement method that is important for ease of use at the time of living body imaging and authentication accuracy, and has a problem of authentication accuracy in practice.

  Also in Patent Document 2, as in Patent Document 1, the portable information terminal described does not have a shape that takes into account the finger placement.

  As described above, neither of these Patent Documents 1 and 2 considers finger placement at the time of finger authentication and positional accuracy between the finger and the information terminal device, and clearly displays the vein pattern and finger placement accuracy. There was a problem.

  An object of the present invention is to provide a communication terminal device having a finger vein authentication device that solves such problems, improves finger installation accuracy during finger authentication, and can acquire clear finger vein image information. There is.

In order to achieve the above object, the present invention provides a communication terminal device including a vein authentication device including an imaging unit that converts a finger vein into a video signal and a light source unit that irradiates light to the finger vein. The authentication device has a configuration in which the imaging unit and the light source unit are arranged to face each other in a recess for inserting a finger provided in a housing of the communication terminal device, and the imaging unit is the recess. Placed on the abdomen side of the finger inserted into the part, the light source part is placed on the back side of the finger to acquire an authentication image of the finger, and the inside of the hollow part is more than the light source part in the hollow part. Protruding pieces are provided on the fingertip side of the finger when the finger is inserted into the nail, and the boundary between the nail and the skin of the back of the finger inserted into the recess is in contact with the finger. .

  Further, the present invention is characterized in that the recess is provided on a side surface of the housing.

  Further, the present invention is characterized in that an angle θ formed by the light beam of the imaging unit and the center line in the minor axis direction of the casing is 10 ° ≦ θ ≦ 70 °.

Further, the present invention provides a predetermined gap between the abdomen side of the finger and the imaging unit when the finger is inserted into the recess with the back side of the finger in contact with the inner surface of the recess. The interval between the light source unit and the imaging unit is set so that the above occurs.

  Further, the present invention is characterized in that a gap L between the abdomen side of the finger and the imaging unit is 2 mm ≦ L ≦ 7 mm.

Further, the present invention is characterized in that the mounting position of the protruding piece is a position of 1 mm to 5 mm from the base of the fingernail .

  According to the present invention, since the finger can be installed in a natural place without difficulty in the communication terminal device when the authentication video is captured, the communication terminal device having a structure that is smooth and easy to use. Can be provided.

  Further, since the finger position is fixed to the vein authentication device or the communication terminal device, the finger position error between the registration of the authentication video and the authentication can be reduced, and high authentication accuracy can be realized.

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

  FIG. 1 is an overall perspective view showing a first embodiment of a communication terminal device provided with a finger vein authentication device according to the present invention. 1 is a communication terminal device provided with the finger vein authentication device of this embodiment (hereinafter referred to as the following). 1a is an upper side surface part, 2 is a hollow part, and 3 is an index finger.

  In the figure, a recess 3 is provided in the upper side surface 1a of the housing of the communication terminal device 1, and a finger vein authentication device described later is provided in the recess 1a. For example, as shown in the figure, when the operator of the communication terminal device 1 holds the hollow part 3 with the left hand, one of the fingers of the left hand, here, the index finger 3 does not take an unreasonable posture, And it is formed so that it can enter with a margin.

  FIG. 2 is a partial perspective view showing an essential part of the embodiment shown in FIG. 1 in an exploded manner. Reference numeral 4 denotes an image pickup unit, 5 denotes a light source unit, and 6 denotes a finger fixing projection piece. Are given the same reference numerals and redundant description is omitted.

  In the same figure, the imaging part 4 and the light source part 5 are arrange | positioned so that it may mutually oppose on the inner surface of the hollow part 2. FIG. The imaging unit 4 includes a sensor unit and a lens unit that include solid-state imaging unit elements such as a CMOS sensor and a CCD sensor. The lens unit has a single lens configuration or a multi-lens configuration in which single lenses are arranged in an array. Either may be present. Moreover, the light source part 4 should just be a light source which light-emits the wavelength range of 600 nm-900 nm most suitable for projecting a vein, LED or semiconductor leather etc. are used. Although not shown, a wavelength selection filter may be provided for the purpose of blocking unnecessary light.

  Here, the imaging unit 4 and the light source unit 5 are arranged so that their optical axes coincide.

  Also, a finger fixing projection piece 6 is provided in the vicinity of the light source part 5 on the inner surface of the recess part 2. This finger fixing projection piece 6 will be described with reference to FIG.

  FIG. 3 is a cross-sectional view showing a state in which the index finger 3 is inserted into the indented portion 2, wherein 3a is a nail, 3b is skin, and portions corresponding to the previous drawings are denoted by the same reference numerals and overlapped. Description to be omitted is omitted.

  In the figure, the finger fixing projection piece 6 is provided with the finger fixing projection piece 6 on the fingertip side of the index finger 3 when the index finger 3 is inserted into the recess 2 rather than the light source part 5. The shape of the finger fixing projection piece 6 is a shape that substantially matches the step between the nail 3a of the index finger 3 and the boundary line between the skin 3b on the same side as the nail 3a. The index finger 3 is inserted into the recess 2 so that the back side (nail 3a side) faces the light source unit 5 and the abdomen side faces the imaging unit 4 side. The index finger 3 can be positioned so that the boundary line portion with the skin 3 b hits the finger fixing projection piece 6. Thereby, the precision of the installation position and direction of the index finger 3 in the hollow part 2 will improve significantly.

  4 is a cross-sectional view showing the positional relationship between the imaging unit 4 and the light source unit 5 in the hollow part 2 shown in FIG. 1, wherein 3c is an abdomen, 7 is an optical axis of the imaging unit 4, and 8 is a communication terminal device. 1 is a center line in the minor axis direction, and the same reference numerals are given to portions corresponding to the above-mentioned drawings, and redundant description is omitted.

  In the same figure, when a predetermined operation is performed with the index finger 3 positioned by the finger fixing projection piece 6 in the recess 2, light is irradiated from the light source unit 5 to the back surface of the index finger 3, and the irradiated light beam Is reflected by the vein in the index finger 3, and light passing through the other part is emitted from the abdomen 3 c side of the index finger 3. Thereby, an image of a finger vein unique to the human body is obtained, and this vein image is photographed by the imaging unit 4 and converted into a video signal. Based on the obtained video signal, veins are patterned and recognized as personal information.

  Here, the back portion of the index finger 6 may directly contact the light source unit 5, or a gap may be provided between the index finger 3 and the light source unit 5. As a method of providing such a gap, a recess is provided on the inner surface of the recess 2 and the light source 5 is installed in the recess so that the surface of the light source 6 does not protrude from the inner surface of the recess 2. Alternatively, a gap may be provided between the index finger 3 and the light source unit 5 depending on the shape, size, height, and the like of the finger fixing projection piece 6.

  In addition, the imaging unit 4 is disposed on the inner periphery of the depression 2 and has a predetermined gap between the abdomen 3c of the index finger 3 and the imaging unit 4 so that the index finger 3 is not compressed and the finger vein is clearly projected. L is provided. The value of the gap L was found to be 2 mm ≦ L ≦ 7 mm from experiments, considering the convenience of the index finger 3 and the best image of finger veins. In particular, in order to allow the finger to be smoothly inserted into the indented portion 2, it is clear using the subject that L ≧ 2 mm. To obtain a clear finger vein image, the F number of the imaging unit 4 is used. And the focal length, it was found that L ≦ 7 mm.

  Further, the orientation of the imaging unit 4 is set so that the optical axis 7 passes through the central part of the abdomen 3c of the index finger 6 inserted into the recess 2. On the other hand, when the angle between the optical axis 7 of the imaging unit 4 and the center line 8 in the short axis direction of the communication terminal device 1 (that is, the width direction perpendicular to the height and thickness as viewed in FIG. 1) is θ. When 10 ° ≦ θ ≦ 70 ° is set, as shown in FIG. 1, when the communication terminal device 1 is grasped with a hand, the position of the index finger 3 is natural, and the index finger 3 is placed in the communication terminal without causing pain. It can be placed in the indentation 2 of the device 1 and an optimal finger vein image can be obtained.

  Here, the angle θ formed by the optical axis 7 of the imaging unit 4 and the central axis 8 in the short axis direction of the communication terminal device 1 may be fixed, or a variable method that can be changed as appropriate. In this variable method, the light source unit 5 and the finger fixing projection piece 6 are integrally displaceable in the vertical direction (on the drawing) along the inner surface of the hollow portion 2 indicated by the arrow P in FIG. Similarly, the portion 4 can be displaced in the vertical direction (on the drawing) along the inner surface of the hollow portion 2 indicated by the arrow Q. In this case, these position adjustments can be performed by operating, for example, an adjustment screw (not shown). Further, even after adjusting these positions, the optical axis 7 of the imaging unit 4 needs to coincide with the optical axis of the light source unit 5. For example, this is caused by emitting a light beam from the light source unit 5. The solid-state imaging device of the imaging unit 4 captures an image so that the image is received, and the captured image is displayed on a display screen (not shown) provided in the communication terminal device 1. Therefore, it is only necessary to confirm whether or not the optical axis 7 of the imaging unit 4 coincides with the optical axis of the light source unit 5.

  As described above, in the first embodiment, the depression 2 is provided at a position where the index finger on the side surface of the communication terminal device can be inserted without difficulty, so that the communication terminal device can be gripped smoothly. The index finger 3 for acquiring the finger vein image can always have the same state and position, and the installation accuracy of the index finger 3 can be improved. In addition, the imaging unit 4 and the light source unit 5 Since the light source unit 5 irradiates the index finger 3 with light so that the optical axes of the light source unit 5 are coincident with each other, the use efficiency of the light amount of the light source unit 4 is increased and a clear finger vein image is obtained. For this reason, even when a finger vein image is registered, and even at the time of authentication, the position error of the index finger 3 can be reduced and high authentication accuracy can be realized.

  Further, the provision of the finger fixing projection piece 6 increases the setting accuracy of the position and orientation of the index finger 3 in the recess 2 and a clearer finger vein image can be obtained.

  In the first embodiment, the index finger is used to acquire the finger vein image. However, any other finger such as the thumb, middle finger, ring finger, and little finger may be used. Although the position 2 is the upper side surface 1a of the communication terminal device 1, depending on the finger or the like from which the finger vein image is to be acquired, the hollow portion 2 is replaced with the left side surface portion, the right side surface portion of the housing of the communication terminal device 1, You may make it provide in any side surface of a lower side surface part or a diagonal side surface part.

  FIG. 5 is an overall perspective view showing a second embodiment of a communication terminal device provided with a finger vein authentication device according to the present invention, wherein 9 is an upper housing, 9a is an inner surface, 10 is a lower housing, and 10a is an inner surface. , 11 is a hinge, 12 is a finger fixing projection, 13 is an inclined surface, and 14 is a groove. The same reference numerals are given to portions corresponding to the above-mentioned drawings, and overlapping description is omitted.

  In this figure, the communication terminal device 1 has a configuration in which an upper casing 9 and a lower casing 10 are connected by hinges 11 at their ends, and the upper casing 9 is lowered by the hinge 11. It can rotate with respect to the housing 10. Thereby, the surface of the upper housing 9 on the lower housing 10 side (ie, the inner surface 9a of the upper housing 9) and the surface of the lower housing 10 on the upper housing 9 side (ie, the inner surface of the lower housing 10). 10a) can be changed from a state where the upper housing 9 is closed (a state where the upper housing 9 is closed) to a state where the upper housing 9 is rotated with respect to the lower housing 10 (a state where the upper housing 9 is opened). it can.

  Here, a display unit (not shown) or the like is provided on the inner surface 9a of the upper casing 9, and a key input unit (not shown) or the like is provided on the inner surface 10a of the lower casing 10. Yes.

  A finger fixing projection 12 is provided along the side of the tip of the upper housing 9 opposite to the hinge 11 side. The finger fixing projection 12 has a configuration in which the surface protrudes from the inner surface 9 a of the upper housing 9 at an angle ψ, and the upper housing 9 is opened and the inner surface 9 a is the inner surface of the upper housing 10. In the state inclined by an angle ψ, the surface of the finger fixing projection 12 is parallel to the inner surface 10 a of the lower housing 10. Here, the click point is provided on the hinge 11, the upper housing 9 is opened from the closed state, and the inner surface 9 a of the upper housing 9 is inclined by an angle ψ with respect to the inner surface 10 a of the upper housing 10. When the state is reached, a click is generated to prevent the upper housing 9 from being opened by the click point of the hinge 11 (this state is hereinafter referred to as a click state), and the operator perceives that the click state has been reached. be able to. Of course, the upper housing 9 can be further opened from this clicked state.

  A light source unit 5 is provided at the boundary between the inner surface 9 a of the upper housing 9 and the finger fixing projection 12, and a finger fixing projection piece 6 is provided in the vicinity of the light source unit 5 on the finger fixing projection 12. Further, on the inner surface 10a side of the lower housing 10, an inclined surface 13 is provided along the side at the tip portion opposite to the hinge 11 side. The inclined surface 13 is inclined at an angle ψ from the inner surface 10a so as to be recessed from the inner surface 10a. Further, the inclined surface 13 has a groove portion into which the finger fixing projection piece 6 of the upper housing 9 is fitted when the upper housing 9 is closed (that is, when the upper housing 9 is overlapped with the lower housing 10). 14 is provided. Therefore, when the upper housing 9 is closed, the finger fixing protrusions 6 are fitted into the grooves 14, and the surface of the finger fixing protrusion 12 on the upper housing 9 side overlaps the inclined surface 13 of the lower housing 10. As a result, the upper housing 9 and the lower housing 10 overlap (close) as a whole.

  On the inner surface 10 a of the lower housing 10, the imaging unit 4 is provided in the vicinity of the boundary with the inclined surface 13. Here, when the upper housing 9 is in a clicked state, the light source unit 5 and the imaging unit 4 are arranged so that the optical axis of the light source unit 5 on the upper housing 9 side matches the optical axis of the imaging unit 4. The positional relationship is set. The imaging unit 4 may be protruded from the inclined surface 13 or may be installed by being dented.

  When acquiring an image of a finger vein of a finger, the upper housing 9 is clicked, and the index finger 3 is placed on (contacts) the finger fixing protrusion 12 of the upper housing 9. Here, as in the first embodiment, the finger fixing protrusion 6 in the upper housing 9 is on the fingertip side of the index finger 3 applied to the light source unit 5.

  FIG. 6 is a side view showing a state when the finger vein image of the second embodiment shown in FIG. 5 is acquired. The parts corresponding to those in FIG. .

  FIG. 7 is a front view seen from the arrow J side in FIG. 6, and parts corresponding to those in FIG.

  In this figure, in this case, the upper housing 9 is in a clicked state inclined by an angle ψ with respect to the lower housing 10, and in this state, the index finger 3 moves its claw 3 a toward the upper housing 9. The abdomen 3c side is applied to the upper housing 9 with the imaging unit 4 facing. In this case, as shown in FIG. 7, the index finger 3 is positioned at the boundary between the inner surface 9a of the upper housing 9 and the finger fixing projection 12, and the boundary between the nail 3a of the index finger and the skin is further provided. Is placed on the finger-fixing protrusion piece 6 provided on the finger-fixing protrusion 12. Thus, by positioning the index finger 3, the optical axis 7 of the imaging unit 4 passes through the approximate center of the index finger 3.

  Here, the index finger 3 is inserted between the upper casing 9 and the lower casing 10 while the upper casing 9 is clicked, and the index finger 3 is applied to the upper casing 9 side as described above. A predetermined gap L is formed between the abdominal part 3 c of the index finger 3 and the imaging unit 4. This gap L is provided for the same reason as the gap L in FIG. 4 of the first embodiment, and the experiment is performed in consideration of the best use of the index finger 3 and the image of the finger vein. Thus, it was found that 2 mm ≦ L ≦ 7 mm. The click point of the hinge 11 is determined so that the gap L is obtained in this way.

  In the second embodiment, the same effect as that of the first embodiment can be obtained. However, the upper housing 9 serves as a light shielding member for the imaging unit 4, and external light It has a strong merit against disturbance.

  In the second embodiment, as in the first embodiment, the finger for acquiring the finger vein image is not limited to the index finger, and any one of the thumb, middle finger, ring finger, and little finger is used. It may be.

  In the second embodiment, the light source unit 5 and the finger fixing projection 6 are arranged on the upper case 9 side where the display unit is provided, and the imaging unit 4 is provided on the lower case provided with a key input unit. Although the arrangement relationship provided on the 10 side is not limited to this, for example, the arrangement relationship may be reversed, and the light source unit 5 or the light source unit 5 may be arranged so that the finger is inserted toward the hinge 11 side. The finger fixing protrusion 6 and the imaging unit 4 may be arranged.

It is a whole perspective view showing a 1st embodiment of a communication terminal device provided with a finger vein authentication device by the present invention. It is a fragmentary perspective view which expands and shows the principal part of embodiment shown in FIG. It is sectional drawing which shows a state when an index finger is inserted in the hollow part in FIG. It is sectional drawing which shows the arrangement | positioning relationship between the imaging part and light source part in the hollow part shown in FIG. It is a whole perspective view which shows 2nd Embodiment of the communication terminal device provided with the finger vein authentication apparatus by this invention. It is a side view which shows a state when acquiring the image | video of the finger vein of 2nd Embodiment shown in FIG. It is the front view seen from the arrow J side of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication terminal device 1a Upper side surface part 2 Indentation part 3 Index finger 3a Nail | claw 3b Skin 3c Abdomen 4 Imaging part 5 Light source part 6 Finger fixing protrusion part 7 Optical axis of the imaging part 4 8 Centerline of the short axis direction of the communication terminal apparatus 1 9 Upper housing 9a inner surface 10 lower housing 10a inner surface 11 hinge 12 finger fixing projection 13 inclined surface 14 groove

Claims (6)

A communication terminal device including a vein authentication device composed of an imaging unit that converts a finger vein into a video signal and a light source unit that irradiates light to the finger vein,
The vein authentication device
In the hollow portion for inserting a finger provided in the casing of the communication terminal device, the imaging unit and the light source unit are arranged to face each other,
The imaging unit is arranged on the abdomen side of the finger inserted into the hollow part, the light source unit is arranged on the back side of the finger, and obtains an authentication video of the finger ,
The boundary between the nail and the skin of the back part of the finger inserted into the recess comes into contact with the fingertip side of the finger when the finger is inserted into the recess than the light source in the recess. Protruding piece provided,
A communication terminal device comprising a finger vein authentication device. In claim 1,
The communication terminal device provided with a finger vein authentication device, wherein the hollow portion is provided on a side surface portion of the housing. In claim 1,
A communication terminal device provided with a finger vein authentication device, characterized in that an angle θ formed between a light beam of the imaging unit and a short-axis direction center line of the housing satisfies 10 ° ≦ θ ≦ 70 °. In claim 1,
In the recess, when the finger is inserted with the back side of the finger in contact with the inner surface of the recess, a predetermined gap is generated between the abdomen side of the finger and the imaging unit. A communication terminal device comprising a finger vein authentication device, wherein an interval between a light source unit and the imaging unit is set. In claim 4,
A communication terminal device provided with a finger vein authentication device, wherein a gap L between the abdomen side of the finger and the imaging unit is 2 mm ≦ L ≦ 7 mm. In claim 1 ,
The communication terminal device provided with the finger vein authentication device, wherein the protrusion is attached at a position of 1 mm to 5 mm from the base of the fingernail .

Images