JP2007325793A - Vein pattern sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, a conventional authentication device exhibits great loss of light intensity, provides no high-quality blood vessel pattern, has a complicated and enlarged structure to cause a cost increase, has a fixed disposition relation between a light source section and an imaging section and, for example, is not foreseen to be assembled in an opening/closing section of a laptop PC. <P>SOLUTION: This vein pattern sensor is provided with a near-infrared light source 2, a rotational light source casing 1 having a touch panel 3 which a finger 4 comes into contact with and is mounted on, and an imaging casing 11 having an imaging device 10. The light source casing 1 and the imaging casing are rotationally turned to dispose the near-infrared light source 2 facing the imaging device 10 on a line to highly precisely authenticate the vein pattern without loosing the light intensity despite a compact size. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an authentication apparatus for identifying an individual using biological information, and more particularly to a vein pattern sensor that performs authentication using a blood vessel pattern, particularly a finger vein pattern (vein shape).

  In recent years, authentication devices authenticate eligibility using user biometric information. The biometric information used for user authentication is difficult to forge. Therefore, the authentication device using biometric information can prevent illegal exercising due to loss or theft as compared with, for example, a cash card or key using a personal identification number or magnetic tape. The biological information includes, for example, a vein pattern. Patent Documents 1 and 2 disclose an authentication device that authenticates the vein pattern.

  FIG. 18 is a schematic perspective view of the authentication device disclosed in Patent Document 1. As shown in FIG. FIG. 19 is a schematic diagram of the authentication apparatus shown in FIG.

  As shown in FIGS. 18 and 19, a guide groove 108 having a shape that makes it easy to intuitively understand the place where the finger 102 is brought into contact is provided on the upper surface of the authentication device casing 100. The guide groove 108 has a function as a side wall that is low enough to hide the lower half surface of the finger (palm side or projection side).

  The guide groove 108 is provided with a button switch 118 that comes into contact when a finger is placed. Further, light source portions 104 are provided on the left and right sides of the guide groove 108. A near-infrared light source 114 is provided inside the light source unit 104, and a light source opening 106 is provided on the surface of the light source unit 104. The light source unit 104 covers the upper surface of the near infrared light source 114.

  The light emitted from the near-infrared light source 114 illuminates the side surface of the finger 102 that is in contact with the guide groove 108 through the light source opening 106. At that time, the light source unit 104 covers and prevents the light diffused in the direction other than the irradiation direction from being reflected by a finger or palm other than the finger 102 and affecting photographing as disturbance light.

  A photographing opening 110 is provided in the guide groove 108. The front and rear portions of the first and second joints of the finger 102 are placed in the imaging opening 110. The photographing opening 110 is covered with a transparent glass or an acrylic plate together with the light source opening 106. The photographing opening 110 prevents foreign matter such as dust from entering the authentication device casing 100 while allowing light to pass therethrough.

  A camera (shooting unit) 112 is provided below the shooting opening 110. The camera 112 captures a clear image of the blood vessel pattern of the irradiated finger 102. Further, the camera (imaging unit) 112 is equipped with a filter that passes only wavelengths in the near infrared region. This filter suppresses the incidence of light other than the wavelength in the near infrared region (for example, light in the visible light region).

  FIG. 20 is a schematic perspective view of an authentication device disclosed in Patent Document 2.

  As shown in FIG. 20, the authentication device casing 200 is roughly provided with a light source unit 202 and an imaging unit 204. A space is provided between the light source unit 202 and the imaging unit 204. A finger (not shown) is inserted into this space during authentication.

  The light source unit 202 covers the upper part of the space into which the finger is inserted so that the eaves protrude. Therefore, the light source unit 202 is shielded so that, for example, light emitted from illumination provided on the ceiling or the like does not directly enter the imaging unit 204. The light source unit 202 is provided with a side wall. This side wall blocks light entering from the side, for example. Further, a coating material such as an antireflection agent is applied to the side wall in order to improve authentication accuracy and prevent irregular reflection of near infrared rays. Alternatively, an antireflection material is provided on the side wall.

  The light source unit 202 is provided with a light source 206 that emits near-infrared light having a wavelength of about 810 nm. The light source 206 irradiates light toward the camera 214 provided in the imaging unit 204.

  A guide groove 212 is provided in the imaging unit 204. The guide groove 212 has a shape that makes it easy to intuitively understand the correct insertion position and orientation of the finger. The guide groove 212 is provided with an opening 210. The opening 210 is covered with transparent glass or an acrylic plate. The opening 210 prevents foreign matter such as dust from entering the authentication device housing 200 while allowing light to pass therethrough.

When the user inserts a finger into the space between the light source unit 202 and the imaging unit 204, the light source 206 irradiates the finger with near infrared light. At that time, the camera 214 obtains a finger blood vessel pattern image by photographing a finger image.
JP 2004-265269 A Japanese Patent No. 3630675

  However, in Patent Document 1 described above, light incident from the side surface of the finger 102 is scattered inside the finger 102. Therefore, only a part of the light emitted from the near-infrared light source 114 goes to the imaging unit 112 provided below the finger 102. The remaining light diffuses without going to the photographing unit 112.

  For this reason, the photographing unit 112 greatly loses the amount of light to be detected. If the amount of light to be detected is small, the S / N of the detection signal is lowered, and a high-quality blood vessel pattern may not be obtained.

  The authentication device disclosed in Patent Document 2 described above is a transmissive type. Therefore, it is necessary for the authentication device to capture an image of a finger inserted at an arbitrary position of the opening 210 without being injured.

  When the shooting angle of view of the camera 214 is constant, it is necessary to increase the relative distance (object distance) between the opening 210 and the camera 214.

  Alternatively, when the distance between the opening 210 and the camera 214 is constant, the shooting angle of view of the camera 214 needs to be increased. As a result, the structure of the authentication device becomes complicated, leading to an increase in cost and a further increase in size.

  Both of the authentication devices disclosed in Patent Document 1 and Patent Document 2 are fixed so that the mutual arrangement relationship between the light source unit and the imaging unit does not change. These devices are not supposed to be incorporated into devices whose arrangement relationship changes.

  In other words, what is the optimal authentication method when it is incorporated into a device that changes the positional relationship between the light source unit and the imaging unit, or when it is incorporated into a device that changes the optical axis relationship between each other? It is not disclosed or suggested.

  Therefore, an object of the present invention is to provide a vein pattern sensor that is compact and can accurately perform vein pattern authentication processing even if the mutual arrangement relationship between the light source unit and the imaging unit changes.

  In order to solve the above problem, a light source that emits light that passes through a subject, a first holding unit that holds the light source, an imaging unit that images light, and a second holding unit that holds the imaging unit, The connecting portion of the first holding portion and the connecting portion of the second holding portion are connected, and the relative distance between the light source and the imaging portion is changed by changing the relative distance between the light source and the imaging portion, and the relative distance is detected. And a light source control unit that controls light emission when the relative distance is detected by the first detection unit.

  The present invention can provide a vein pattern sensor that is compact and can perform vein pattern authentication processing with high accuracy even if the positional relationship between the light source unit and the imaging unit changes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the following embodiments, the X direction is the width direction of a keyboard provided in a PC (personal computer), the Y direction is the depth direction of the keyboard, and the Z direction is a direction orthogonal to the X direction and the Y direction. To do. The laptop PC 7 described in the present specification is opened and closed as shown in FIG.

  The first embodiment will be described in detail with reference to FIGS.

FIG. 1 is an external configuration diagram of a vein pattern sensor used in the present embodiment. FIG. 2 is a diagram illustrating the configuration of the rotating unit.
In the PC 7, one end that is a connecting portion of the keyboard 14 that is a first holding member and one end that is a connecting portion of the display 15 that is the second holding member are connected by a hinge 44 that is a variable portion. At least one of the hinges 44 can be relatively rotated around one end of the keyboard 14 and one end of the display 15 connected to each other. Thereby, the keyboard 14 and the display 15 are configured to be openable and closable. In FIG. 1, the display 15 indicated by a solid line indicates an open state, and the display 15 ′ indicated by a two-dot chain line indicates a closed state. The light source casing 1 is held on the surface of the keyboard 14 of the PC 7. Further, an imaging housing 11 is held above the display 15 of the PC 7. The light source casing 1 and the imaging casing 11 rotate with respect to the keyboard 14 and the display 15 so as to face each other. The hinge 44 connects one end of the keyboard 14 and one end of the display 15 to change the relative distance (object distance) between the light source casing 1 and the imaging casing 11, and the light source casing 1 (light source unit 2) and the imaging casing. 11 (image sensor 10) is configured to face the variable portion.

  The light source housing 1 includes a plurality of light source units (hereinafter, near-infrared light sources) 2 that emit light that passes through the finger 4, a touch panel 3 on which the finger 4 is placed in contact, and a rotation that is a light source tilt adjustment mechanism. A central portion 5 is provided.

  In the present embodiment, in order to detect the vein pattern of the finger 4, it is necessary to match the wavelength range of the near infrared light source 2 with the light absorption wavelength range of the fingertip vein. Therefore, the near-infrared light source 2 uses, for example, an LED that emits near-infrared light having a wavelength range of about 750 nm to 800 nm. As a result, the black portion absorbed by the finger 4 can be detected as the shape of the vein pattern.

  The near infrared light sources 2 are arranged in a number corresponding to the required light quantity in a planar shape. The arranged near-infrared light sources 2 are mounted on a substrate (not shown) disposed below the touch panel 3. The emission of the near-infrared light source 2 is controlled by the light source control unit 16. The light source control unit 16 controls this control so that light is emitted when the first detection unit 17 detects an object distance described later.

  When the finger 4 comes into contact with the upper surface of the touch panel 3, the touch panel 3 is pushed by the finger, whereby the light source housing 1 rotates around the rotation center portion 5. Thereby, the light source housing 1 can adjust the relative inclination (angle) with respect to the keyboard 14, and the near-infrared light source 2 can adjust the relative inclination so as to be in a positional relationship facing the imaging unit 10.

  The imaging housing 11 includes a band-pass filter 8, an imaging lens 9, an imaging unit (hereinafter referred to as an imaging device) 10 that captures light transmitted through the finger 4, and a rotation center unit 12 that is an imaging tilt adjustment mechanism. , Is provided.

  The band pass filter 8 is set so as to transmit near infrared light emitted from the near infrared light source 2 and not transmit other light. This improves the S / N of the detected vein pattern.

  The imaging lens 9 is made of a transparent material such as glass or plastic. The imaging lens 9 uses about one or two of these materials. The imaging lens 9 forms an image of the finger 4 (vein pattern) within the shooting angle of view 6 on the imaging surface of the imaging element 10. The angle of the shooting angle of view 6 may be an angle that projects a range (20 to 30 mm) near the second joint from the first joint of the finger 4.

  As the image sensor 10, for example, an inexpensive CCD or CMOS having about several hundred thousand pixels may be used. However, the image pickup device 10 is preferably of a type in which an IR cut filter or a color filter is removed and light is directly received by a Si photodiode in order to receive near infrared light emitted from the near infrared light source 2. Since the spectral sensitivity of Si has a peak in the vicinity of a wavelength of 900 nm, the image sensor 10 can receive near-infrared light in the vicinity of a wavelength of 800 nm with high sensitivity.

  The imaging housing 11 rotates around the rotation center portion 12. Thereby, the imaging housing 11 can adjust the relative inclination with respect to the display 15, and the imaging element 10 can adjust the relative inclination so as to be in a positional relationship facing the near infrared light source 2.

  Note that the imaging housing 11 may also be used as a WEB camera generally used for a PC. At that time, if an IR cut filter for removing near-infrared wavelengths can be inserted and removed, the functions of the WEB camera and the vein pattern detection can be accurately maintained.

  Next, the rotation mechanism of the light source casing 1 and the imaging casing 11 will be described in detail with reference to FIG. In FIG. 2, the light source casing 1 is illustrated as an example.

  The rotation mechanism includes a rotation center shaft 41, a leaf spring 42 fixed to the rotation center shaft 41, and the light source housing 1 when the light source housing 1 rotates in the direction of the arrow shown in the figure. A gear 43 that fixes the leaf spring 42 according to the amount of rotation is provided.

  When the touch panel 3 is pushed by a finger, the light source housing 1 rotates around the rotation center axis 41 passing through the rotation center portion 5. When rotating, the leaf spring 42 is sequentially engaged between the teeth of the gear 43, and the light source housing 1 is fixed. As a result, the angle of the light source casing 1 can be adjusted with respect to the keyboard 14, and the light source casing 1 is fixed at a predetermined position.

  The configuration of the imaging housing 11 has the same structure, and the imaging housing 11 can adjust the angle with respect to the display 15 and is fixed at a predetermined position.

  Next, the distance (object distance) from the light source casing (finger) to the imaging casing (lens) when the vein pattern is authenticated will be described with reference to FIGS.

  3 and 4 are diagrams for explaining the distance (object distance) from the light source casing (finger) to the imaging casing (lens).

In the present embodiment, the size (thickness) of the finger 4 to be imaged is the real field of view: FOV, the distance between the finger 4 and the imaging lens 9 is the object distance: L (L1, L2), and the imaging area of the image sensor 10 is d. When (d1, d2) and the focal length of the imaging lens 9 are f (f1, f2),
L × d = f × FOV (1)
The following formula is generally established.
From this equation, when the real field of view FOV and the focal length f are constant, the imaging area d can be reduced by increasing the object distance L.

From the above equation (1), for example, if the size (thickness) of the finger 4 to be imaged is 30 mm for the real field of view FOV and the focal lengths f1 and f2 of the imaging lens 9 are 10 mm,
For example, when the object distance L is L1 = 20 mm as shown in FIG.
The imaging area d1 = f1 × FOV / L1 = 10 × 30/20 = 15 mm.

For example, when L is L2 = 200 mm as shown in FIG.
The imaging area d2 = f2 × FOV / L2 = 10 × 30/200 = 1.5 mm.

  When the object distance L1 = 20 mm, since the imaging area d1 is 15 mm, the 3/2 inch (19.1 mm) size imaging element 10 having a horizontal size larger than 1 inch (12.8 mm) is used. Become. As a result, the imaging system becomes very large.

  When the object distance L2 is 200 mm, the imaging area d2 is 1.5 mm. Therefore, the imaging element 10 having a light receiving size of 2.1 mm and a 1 / 7-inch size, or 110,000 pixels having a light receiving size of 1.8 mm. The 1/9 inch size image sensor 10 is suitable. In addition, the inch size of the image sensor 10 quoted here is a nominal size and is different from the actual size.

  By increasing the object distance L in this way, the imaging system can be made compact (small).

Further, when considering the most off-axis chief ray determined by the end of the imaging lens 9 obtained by the equation (1), the incident angle θ of the lens incident light at this time is
θ = 2 × tan ⁻¹ (d / 2 / f) (2)
It is calculated by the following formula.

From this formula
When the object distance L1 = 20 mm,
θ1 = 2 × tan ⁻¹ (15/2/10) = ≈74 degrees,
When the object distance L2 = 200 mm,
θ2 = 2 × tan ⁻¹ (1.5 / 2/10) = ≈8.6 degrees.

  Therefore, when the object distance L is short (for example, L1 = 20 mm), an optical system that satisfies a wide angle of view of 8 times or more is required as compared with the case where the object distance L is long (for example, L2 = 200 mm). Accordingly, since a Gaussian type using two imaging lenses 9 is insufficient, it is necessary to suppress peripheral aberrations using about three to four imaging lenses 9. If three or four imaging lenses 9 are used, the optical system becomes large and an expensive lens is required.

  When the object distance L is increased (when L2 = 200 mm), the angle of view is as small as 8.6 degrees, so that a double Gauss type combining two imaging lenses 9 having the same curvature can be used. Thereby, the distortion becomes 0 in principle, and a compact optical system with small aberration can be obtained.

  As described above, the imaging system and the optical system can be made compact even when the object distance L changes and becomes longer as in the present embodiment.

  Next, the touch panel 3 will be described in detail with reference to FIG. FIG. 5 is a schematic side view showing the shape of the touch panel 3.

  The touch panel 3 in this embodiment employs a general analog resistance film method. The analog resistance film type touch panel 3 is an upper film 20 made of PET material or the like, a lower glass 22, and a transparent conductive material formed on the opposing surfaces of the upper film 20 and the lower glass 22. ITO (Indium Tin Oxide) 21 is provided. The thickness of the touch panel 3 is 1 mm or less.

  Usually, the upper film 20 and the lower glass 22 are separated from each other. When the finger 4 comes into contact with the touch panel 3, the upper film 20 is pushed down in the direction of the arrow 24 and comes into contact with the lower glass 22 to energize it. The lower glass 22 is provided with a dot spacer 23 facing the upper film 20. The dot spacer 23 prevents erroneous contact due to the deflection of the upper film 20 caused by an external factor.

  Next, a general operation principle of the touch panel 3 (coordinate detection of the pressing point of the finger 4) will be described.

First, a method for detecting the X coordinate of the pressing point of the finger 4 that contacts the touch panel 3 will be described.
The upper film 20 is provided with an electrode (not shown). When a voltage is applied to this electrode, a potential gradient is generated in the X direction due to the resistance of the ITO 21. This potential passes to the lower glass 22 side through a contact point 25 between the upper film 20 and the lower glass 22 generated by the finger 4. When this potential is detected by the lower glass 22, the X coordinate of the pressed point is detected by the partial pressure.

Next, a method for detecting the Y coordinate of the pressing point of the finger 4 that contacts the touch panel 3 will be described.
The lower glass 22 is provided with an electrode (not shown). When a voltage is applied to this electrode, a potential gradient is generated in the Y direction due to the resistance of the ITO 21. This electric potential is transmitted to the upper film 20 side through a contact point 25 between the upper film 20 and the lower glass 22 generated by the finger 4. When this potential is detected by the upper film 20, the Y coordinate of the pressed point is detected by the partial pressure.

  Since the touch panel transmits 80% or more of the transmitted light, the transmittance from the visible region to the near infrared region of 800 nm or more is 80% or more.

  Next, a general incident angle characteristic of the bandpass filter will be described with reference to FIG.

  The band-pass filter 8 selects only a specific wavelength (in the present embodiment, near-infrared light emitted from the near-infrared light source 2) and transmits the selected wavelength to the imaging lens 9. The band pass filter 8 uses a so-called interference filter that generates a dielectric multilayer thin film on a glass substrate by vapor deposition or the like.

In the band-pass filter 8, when the incident angle is large, the band-pass wavelength band has a characteristic that, in principle, the band-pass wavelength band shifts from A to B to the short wavelength (left) side as shown in FIG. On the other hand, from the formulas (1) and (2), the following formula (3) is obtained.
L = FOV / 2 / tan (θ / 2) (3)
From this, for example, the object distance L when the real field of view FOV (shooting range) is 20 mm and the total angle of view θ is 90 degrees or 70 degrees is obtained as follows.
L = 20/2 / tan (90/2) = 10 mm
L = 20/2 / tan (70/2) = ≈14.3 mm
Therefore, for example, when imaging is performed with a configuration where the shooting range is 20 mm and the object distance is 10 mm and the total angle of view is 90 degrees, compared with the case where the object distance is approximately 14.3 mm and the total angle of view is 70 degrees. The maximum incident angle is increased by 10 degrees. The transmission wavelength band of the bandpass filter for the light incident on the bandpass filter is, for example, a refractive index of 1.5 and a wavelength of 760 nm, and 5 nm when the incident angle changes from 0 degrees to 10 degrees. When it changes from 35 degrees to 45 degrees, it shifts to the short wavelength side by about 32 nm.

  As an example, when a commercially available LED having a wavelength of 760 nm and a wavelength width of 30 nm is used, the highest S / N can be obtained if the transmission wavelength width of the bandpass filter is also set to 30 nm. This is because when the amount of received light per wavelength band is larger than that of external light (light other than light emitted from the near-infrared light source 2), the band-pass filter is larger than the wavelength width of the light source. When the transmission wavelength width is larger, the signal light is constant and the extraneous light noise increases. Conversely, when the transmission wavelength width is smaller, the ratio between the signal light and the extraneous light is constant, but the fixed noise is reduced as the amount of received light decreases. This is because the S / N ratio decreases in both cases because the ratio of electrical noise that affects the component increases.

  However, the object distance L may change as the PC 7 opens and closes as in this embodiment. The smaller the object distance L1, the larger the incident angle θ in the band-pass filter 8 when the light transmitted through the finger 4 passes through the imaging lens 9 and forms an image on the imaging element 10.

  When the incident angle θ increases, the bandpass wavelength band shifts to the left as described above. Therefore, it is necessary to set a wide transmission wavelength width of the bandpass filter 8 in advance as indicated by a dotted line C shown in FIG.

The transmission wavelength width Δλ at that time is
Transmission wavelength width Δλ (nm) = θ1 × shift amount / increased angle increase
Can be obtained from

  In the above case, Δλ = θ1 × 7/10. As a result, the transmission wavelength width Δλ (nm) that is set wider can be covered even if it is shifted from A to B to the left.

When the transmission wavelength width is wide, extraneous light (light other than light emitted from the near-infrared light source 2) that becomes noise for the read signal also enters the image sensor 10. As a result, the S / N is lowered, and an error in reading the vein pattern is likely to occur. That is, in the configuration in which the angle of view is large because the object distance between the finger and the lens is small as in the conventional examples shown in FIGS. 19 and 20, the incident angle range to the bandpass filter is large, and thus the transmission wavelength width of the bandpass filter is large. Needs to be set wider, and the S / N is reduced by external light noise.
However, in the present embodiment, as shown in FIG. 4, it is possible to set the object distance L2 shown in FIG. 4 which is larger than the object distance L1 shown in FIG. 3 while maintaining the photographing range FOV shown in FIG. Become. Therefore, the incident angle θ2 with respect to the band-pass filter 8 can be made much smaller than the incident angle θ1 shown in FIG. Accordingly, Δλ can be set narrow (can be narrowed down), external light can be blocked, high S / N can be obtained, that is, high reading accuracy can be obtained.

  Next, a method for calculating the optical magnification α necessary for detecting the size of the finger 4 with high accuracy will be described with reference to FIGS.

  FIG. 7 is a schematic diagram of an optical system in the vein pattern sensor in the present embodiment. 8 and 9 are top views showing examples of arrangement of near-infrared light sources.

  In FIG. 7, the light sources to be turned on (light source 2A and light source 2C) are arranged in a straight line in the length direction of the finger 4 (the depth direction of the keyboard, that is, the Y direction). However, in order not to be affected by the tilt of the light source housing 1, the light source 2A and the light source 2C are rotated by 90 degrees about the optical axis as shown in FIGS. 8 and 9 (the light source 2A in the width direction of the keyboard). And the light source 2C are preferably arranged in a straight line.

  In FIGS. 8 and 9, the light sources are arranged in the same plane. The vertical and horizontal lengths of the plane are determined according to the aspect ratio of the imaging area detected by the imaging device 10.

  In this embodiment, the object distance L between the light source casing 1 and the imaging casing 11 is not necessarily constant depending on the opening / closing angle between the keyboard and the display and the rotation of the light source casing 1 and the imaging casing 11. Therefore, in the present embodiment, in order for the image sensor 10 to more accurately authenticate the vein pattern of the finger 4, an optical magnification α that is a ratio of the object distance L and the focal distance f is calculated. Thereby, the information on the size of the finger 4 can be grasped more accurately.

  In FIG. 7, the distance D between the light source 2A and the light source 2C (the light source 2B is turned off), which is a part of the near-infrared light source 2 to be turned on, and the focal length f of the imaging lens 9 are known. The distance h between the images of the light sources 2A and 2C can be measured on the image sensor 10 by turning on (operating) the light sources 2A and 2C before the finger 4 is brought into contact with the touch panel 3.

Therefore, the object distance L in the present embodiment is obtained from the above-described equation (1).
L = f × D / h (4)
Can be obtained from

Therefore, since the optical magnification α in the present embodiment is the ratio of the object distance L and the focal distance f as described above,
α = f / L (5)
Can be calculated.

  Next, a correction method when the light source unit and the imaging housing are relatively inclined will be described using the optical magnification α described above with reference to FIG.

  FIG. 10 shows an image captured by the image sensor when the light source casing and the imaging casing are relatively inclined.

  Usually, when the light source casing 1 and the imaging casing 11 are inclined, the image captured by the imaging element 10 has a trapezoidal shape as shown in FIG. The on / off state of the near infrared light source 2 shown in FIG. 10 indicates a state of the near infrared light source 2 at the time of imaging, and indicates a state in which the near infrared light sources 2 at the four corners are lit. Thus, when at least four near-infrared light sources 2 emit the light, the image sensor 10 captures an image having four light sources (light spots).

  As is apparent from FIG. 10, when the image is taken, the relationship between the distances X1 and X2 between the two light sources in the X direction is X1 <X2. This indicates that the near-infrared light source 2 on the X2 side is closer to the imaging system from the relationship of the optical magnification α in the above-described equations (4) and (5).

Based on this idea, in consideration of the Y direction and the center distance between the light source housing 1 and the imaging housing 11, in order to detect whether the relative inclination is 0, the following equation may be used.
(X1-X2) / (Z1 + Z2) = 0 (6)
(Y1-Y2) / (Z1 + Z2) = 0 (7)
Since the above expression monotonously increases or decreases with respect to the slope, the target value of 0 is uniquely determined. Therefore, when the image sensor 10 captures a trapezoidal image as shown in FIG. 10, the control unit detects the values of the distances X1, X2, Y1, Y2, Z1, and Z2 between the light sources, and uses this detection information. The relative inclination between the light source casing 1 and the imaging casing 11 is detected by substituting into the above formulas (6) and (7).

  Next, an inclination correction method will be described.

  In the present embodiment, as described above, when the light source unit and the imaging housing are rotated so as to face each other and tilt correction is performed and when the vein pattern of the finger 4 is imaged, the image of the vein pattern captured is captured. At least one of the inclination corrections for correcting the inclination (by correcting distortion) is performed by image processing.

  First, a correction operation for correcting the tilt by rotating the light source casing 1 and the imaging casing 11 will be described.

  After the operator opens the PC 7, the control unit places the light source housing 1 and the imaging housing 11 so as to face each other (for example, “please make the light source housing 1 and the imaging housing 11 face each other”). A message is displayed on the display 15.

  The operator manually rotates the light source housing 1 and the imaging housing 11 around the rotation center portion 5 and the rotation center portion 12. Further, every time it is rotated, the near-infrared light source 2 emits light slightly as shown in FIG. 10, and the image sensor 10 captures an image.

  In this captured image, the control unit detects the relative inclination between the light source casing 1 and the imaging casing 11 from the equations (6) and (7).

  When detected, the residual deviation and the direction of deviation are displayed on the display 15. When the residual deviation is displayed, a threshold for the residual deviation is also displayed.

  The operator compares the threshold value with the residual deviation and determines whether to rotate.

  When the value of the residual deviation is higher than the threshold value, the operator further rotates.

  If the value of the residual deviation is lower than the threshold value, the operator inputs that the rotation is finished with the keyboard, and ends the tilt correction by the rotation.

  Next, tilt correction for correcting tilt by correcting distortion in image processing will be described. Specifically, a tilt (trapezoid) correction for correcting a trapezoidal image captured by the image sensor 10 into a square image will be described.

  The operator places the finger 4 on the touch panel 3, the light source control unit 16 emits light from the near-infrared light source 2 to the finger 4, and the image sensor 10 captures an image of the finger 4. This image has a trapezoidal shape when the light source housing 1 and the imaging housing 11 do not face each other accurately. At that time, the control unit calculates X1, X2, Y1, Y2 and the optical magnification α so that the difference between trapezoidal shapes X1 and X2 and the difference between Y1 and Y2 are zero. As a result, image processing for converting a trapezoidal image into a square image is performed. After the image processing, the inclination correction is finished.

  Next, the position sensor provided in the light source casing will be described with reference to FIG.

  On the surface of the touch panel 3, a position sensor 13 is provided as a second detection unit that detects the outer shape range of the finger 4 in contact with the touch panel 3. For example, the position sensor 13 divides the position sensor 13 arranged on the touch panel 3 surface into a plurality of areas by dividing the dot sensor into a plurality of areas, for example, so as to coincide with the array of the near infrared light source 2 in the Z direction. The light sources are arranged so as to correspond to each other.

  Next, an operation when a specific light source is selectively turned on based on information detected by the position sensor will be described.

  For example, after the above-described tilt correction is completed, when a message (for example, “Place your finger on the touch panel”) is displayed on a monitor (not shown), the operator places the finger 4 on the touch panel 3. To do. Then, the position sensor 13 detects the above-described potential gradient output from the touch panel 3. A control unit (not shown) recognizes the outline range of the finger 4 placed on the basis of the detection result, and outputs the outline range information to the light source control unit 16. Based on this information, the light source control unit 16 turns on the near-infrared light source 2 located inside the outer range within a range that does not protrude from the outer range of the finger 4 as shown in FIG. A series of operations from the detection of the outer shape range of the finger 4 that is in contact with the near-infrared light source 2 being turned on is more effective when performed in real time during the authentication operation.

  Next, the operation procedure of the authentication operation in this embodiment will be described with reference to FIGS.

  FIG. 12 is a flowchart of a basic operation procedure in authentication according to the present embodiment.

  First, the operation procedure of the authentication operation will be described with reference to FIG.

  The operator opens the PC 7 (STEP 1).

  Next, the control unit displays a message indicating that the light source casing 1 and the imaging casing 11 are arranged opposite to each other (for example, “Please make the light source casing 1 and the imaging casing 11 face each other”) on the display 15. To display.

  Therefore, the operator manually turns the light source housing 1 and the imaging housing 11 around the rotation center portion 5 and the rotation center portion 12 so as to face each other (STEP 2).

  Each time the operator rotates the light source casing 1 and the imaging casing 11, as shown in FIG. 10, the light source control unit 16 causes the near-infrared light source 2 to emit light slightly, and the image sensor 10 captures an image. To do. (STEP3).

  In this captured image, the control unit detects the relative inclination between the light source casing 1 and the imaging casing 11 from the equations (6) and (7) (STEP 4).

  When the control unit detects the relative inclination, the residual deviation and the shift direction are displayed on the display 15. (STEP5).

  When the residual deviation is displayed, a threshold for the residual deviation is also displayed.

  The operator compares the threshold value with the residual deviation and determines whether to rotate (STEP 6).

  In STEP6, when the value of the residual deviation is higher than the threshold (STEP6: YES), the operator returns to STEP2 and further rotates.

  In STEP 6, when the value of the residual deviation is lower than the threshold value (STEP 6: NO), the operator inputs that the rotation is finished with the keyboard, and ends the tilt correction by the rotation (STEP 7).

  Next, the 1st detection part 17 detects the distance (object distance L) of the light source housing | casing 1 and the imaging housing | casing 11 from Formula (4). Based on this detection result, as described above, the control unit calculates the optical magnification α from the equation (5) (STEP 8).

  Next, the operator places the finger 4 on the touch panel 3, the light source control unit 16 emits light from the near-infrared light source 2 to the finger 4, and the image sensor 10 captures an image of the finger 4 (STEP 9). This image has a trapezoidal shape when the value of the residual deviation is lower than the threshold value in STEP 7 but the residual deviation is not 0 (the light source housing 1 and the imaging housing 11 are not accurately opposed to each other).

  When taking an image, the control unit calculates X1, X2, Y1, Y2 and the optical magnification α so that the difference between the trapezoidal shape X1 and X2 and the difference between Y1 and Y2 are zero. As a result, image processing for converting a trapezoidal image into a square image is performed. After image processing, the tilt (trapezoid) correction is completed. (STEP 10).

  After the correction, the vein pattern is authenticated by comparing the vein pattern captured by the control unit (not shown) with the vein pattern registered in advance (STEP 11).

  In this flowchart, after the light source housing 1 and the imaging housing 11 are rotated in STEP 2 to STEP 7 to perform tilt correction, image processing is also performed in STEP 9 and STEP 10 to correct the tilt.

  However, as described above, if either the correction operation for rotating the light source housing 1 and the imaging housing 11 to correct the tilt or the correction operation for correcting the tilt by performing image processing on the captured image is performed. Good. Therefore, the procedure and processing time can be shortened by omitting the other.

  When the distance between the light source casing 1 and the imaging casing 11 is constant during finger authentication, the optical magnification α can be set in advance and used as a fixed value. Therefore, after turning the light source housing 1 and the imaging housing 11 to face each other, STEP 2 to STEP 8 can be omitted, image processing can be performed using a fixed value, and the vein pattern can be authenticated.

  Further, when STEP 2 to STEP 8 are omitted, in STEP 9, it is necessary to detect the relative magnification between the light source housing 1 and the imaging housing 11 from the optical magnification α obtained in STEP 8 and the equations (6) and (7). Thereby, two types of data (optical magnification α and relative inclination) can be obtained by one imaging operation.

Next, the flowchart shown in FIG. 13 will be described.
FIG. 13 is a flowchart in which the tilt / distance detection operation and the imaging operation in FIG. 12 are interchanged, the tilt / distance detection operation is performed after imaging, and then the image is corrected and authenticated.
Similar to STEP 1 shown in FIG. 12, the operator opens the PC 7 (Step 21).

Next, the control unit displays a message indicating that the light source casing 1 and the imaging casing 11 are arranged opposite to each other (for example, “Please make the light source casing 1 and the imaging casing 11 face each other”) on the display 15. To display.

  Therefore, the operator manually rotates the light source housing 1 and the imaging housing 11 around the rotation center portion 5 and the rotation center portion 12 (STEP 22).

  Next, the operator places the finger 4 on the touch panel 3, the light source control unit 16 causes the first detection unit 17 to emit light from the near-infrared light source 2 to the finger 4, and the image sensor 10 moves the finger 4. Are captured (STEP 23). This image has a trapezoidal shape.

  Next, a relative inclination is detected from the equations (6) and (7) in the trapezoidal captured image (STEP 24).

  Next, the 1st detection part 17 detects the distance (object distance L) of the light source housing | casing 1 and the imaging housing | casing 11 from Formula (4). Based on the detection result, the control unit calculates the optical magnification α from Expression (5) (STEP 25).

  The control unit calculates X1, X2, Y1, Y2 and the optical magnification α so that the difference between trapezoidal shapes X1 and X2 and the difference between Y1 and Y2 are zero. Thereby, image processing for converting the trapezoidal shape into a square shape is performed. After the image processing, the inclination correction is finished. (STEP 26).

  After correction, authentication of the vein pattern is performed by comparing the vein pattern captured by the control unit (not shown) with the vein pattern registered in advance (STEP 27).

  According to the procedure of the flowchart shown in FIG. 13, after the finger 4 is imaged, since the apparatus side continuously performs the authentication, the authentication can be quickly performed. Therefore, this flowchart can reduce the standby time.

  As described above, when the distance between the light source housing 1 and the imaging housing 11 is constant, the optical magnification α can be set in advance and used as a fixed value. Therefore, STEP24 to STEP25 can be omitted.

  Next, the flowchart shown in FIG. 14 will be described.

  The flowchart shown in FIG. 14 shows the procedure in more detail than the flowchart shown in FIG.

  The operator opens the PC 7 (Step 31).

  Next, the control unit displays a message indicating that the light source casing 1 and the imaging casing 11 are arranged opposite to each other (for example, “please make the light source casing 1 and the imaging casing 11 face each other”) on the display 15. To display.

  Next, the light source control unit 16 controls the near-infrared light source 2 to emit light slightly (STEP 32).

  Next, the operator manually turns the light source casing 1 and the imaging casing 11 around the rotation center portions 5 and 12 while observing the light that emits slight light so as to face each other (STEP 33, STEP 34). .

  Each time the operator rotates the light source housing 1 and the imaging housing 11, the light source control unit 16 slightly emits the near-infrared light source 2 and the image sensor 10 captures an image as shown in FIG. 10. (STEP 35).

  At the time of this imaging, the light source control unit 16 causes the near-infrared light source 2 with two sides to slightly emit light (flash) alternately in the X direction and the Y direction. An image is taken according to the light emission timing. Simultaneously with the imaging, the distances between the luminance peaks (X1, X2, Y1, Y2, Z1, Z2) are obtained.

  In this captured image, the control unit substitutes this value into equations (6) and (7) to detect the relative inclination between the light source casing 1 and the imaging casing 11 (STEP 36).

  When the control unit detects the relative inclination, the residual deviation and the shift direction are displayed on the display 15. (STEP 37).

  When the residual deviation is displayed, a threshold for the residual deviation is also displayed.

  The operator compares the threshold value with the residual deviation and determines whether to rotate (STEP 38).

  In STEP38, when the value of the residual deviation is higher than the threshold value (STEP38: YES), the operator returns to STEP33 and further rotates.

  In STEP 38, when the value of the residual deviation is lower than the threshold value (STEP 38: NO), the operator inputs that the rotation is finished with the keyboard, and ends the tilt correction by the rotation (STEP 39).

  Next, the 1st detection part 17 detects the distance (object distance L) of the light source housing | casing 1 and the imaging housing | casing 11 from Formula (4). Based on the detection result, as described above, the control unit calculates the optical magnification α from the equation (5) (STEP 40). STEP 40 is necessary when the opening / closing position of the opening / closing part changes every use in the PC 7.

  Next, the operator places the finger 4 on the touch panel 3 (STEP 41).

  When the finger 4 is placed on the touch panel, the light source control unit 16 selectively emits light from the near-infrared light source 2 within the outer range of the finger 4 (STEP 42).

  Then, the image sensor 10 captures an image of the finger 4 (STEP 43). This image has a trapezoidal shape when the value of the residual deviation is lower than the threshold value in STEP 38, but the residual deviation is not 0 (the light source casing 1 and the imaging casing 11 are not accurately opposed to each other).

  When taking an image, the control unit calculates X1, X2, Y1, Y2 and the optical magnification α so that the difference between the trapezoidal shape X1 and X2 and the difference between Y1 and Y2 are zero. As a result, image processing for converting a trapezoidal image into a square image is performed. After image processing, the tilt (trapezoid) correction is completed. (STEP 44).

  After correction, the vein pattern is authenticated by comparing the vein pattern captured by the control unit (not shown) with a vein pattern registered in advance (STEP 45).

  In the present embodiment, since the object distance L from the finger 4 to the imaging lens 9 can be set large, a large real field of view can be obtained even with a small shooting angle of view or a small imaging element 10. Therefore, the imaging system can be reduced in size. Further, by mounting on a device such as the PC 7 that can be folded (FIG. 15) when stored, downsizing can be realized even when stored.

  In this embodiment, the hinge 44 can be opened and closed by relatively rotating at least one of the keyboard 14 and the display 15. When the keyboard 14 and the display 15 are opened, the light source casing 1 (light source unit 2) and the imaging casing 11 (imaging element 10) face each other. Accordingly, since the finger 4, the light source casing 1 (light source section 2), and the imaging casing 11 (imaging element 10) are arranged in a straight line, the vein pattern can be authenticated with high accuracy.

  Specifically, when the keyboard 14 and the display 15 are opened, the light source housing 1 can be rotated with respect to the keyboard 14 and the relative inclination (angle) with respect to the keyboard 14 can be adjusted. It can be rotated relative to the display 15 to adjust the relative inclination. Thereby, the light source casing 1 (light source unit 2) and the imaging casing 11 (imaging element 10) are rotated and adjusted so as to face each other more precisely. Therefore, since the finger 4, the light source casing 1 (light source section 2), and the imaging casing 11 (imaging element 10) are arranged in a straight line, the vein pattern can be authenticated with high accuracy.

  Even if the angle at the hinge 44 is different each time the keyboard 14 and the display 15 are opened, the vein pattern can be authenticated with high accuracy by adjusting as described above.

  Further, when the light source casing 1 and the imaging casing 11 are rotated, the angle can be adjusted by the gear 43, and the light source casing 1 and the imaging casing 11 can be fixed at fixed positions. Thereby, when the light source housing 1 and the imaging housing 11 face each other, a shift is prevented. Further, the operator can prevent the mistake of bringing the front and back of the finger 4 into contact with each other by pushing the light source housing 1 with the finger 4.

  The optical magnification α is calculated before or after imaging based on the object distance L that changes for each authentication. Therefore, during image processing, image distortion can be accurately corrected (a trapezoidal image is converted to a square image), and the accuracy of the arrangement relationship between the light source housing 1 and the imaging housing 11 is high. The vein pattern can be authenticated well.

  In the present embodiment, since the light source casing 1, the finger 4, and the imaging casing 11 can be arranged in a straight line with respect to the light traveling direction, the light emitted from the near-infrared light source 2 can be used in the imaging system without waste. Therefore, the S / N of the detection signal can be increased.

  In addition, since the incident angle range to the band-pass filter disposed in the imaging unit can be narrowed, the transmission wavelength of the band-pass filter can be narrowed, and external light other than the light source wavelength that causes noise can be effectively removed. . Thereby, the S / N of the detection signal can be increased.

  As the optical magnification α, the near-infrared light source 2 to be used may be any two of the near-infrared light sources 2 at the four corners used when obtaining the inclination shown in FIG. In this case, since two types of correction data of tilt and optical magnification α can be acquired by one imaging operation, the authentication time can be shortened. However, as a correction procedure in image processing, it is necessary to perform optical magnification calculation after tilt correction.

  Further, when a large number of near-infrared light sources 2 are arranged, the near-infrared light source 2 may be turned on as guide light for telling the operator where to make the finger 4 contact as shown in FIGS. The near infrared light source 2 to be lit is selected by use.

  For example, the near-infrared light source 2 may be lit in a shape corresponding to the outer shape of the finger 4 or the near-infrared light source 2 may be lit in a straight line. By lighting up in this way, it is possible to indicate a place where the finger 4 is to be placed. Thereby, the detection error can be prevented without the finger 4 being out of the detection visual field of the near-infrared light source 2.

  When an LED that emits near-infrared light is used for the near-infrared light source 2 that is lit, the operator cannot visually check because the wavelength is outside the relative luminous sensitivity. Therefore, in consideration of eye safety (eye protection), the LED emits light with sufficiently weak power (light quantity) and the image pickup device 10 images the light. The control unit may display the captured image on the display 15 or the like and transmit it to the operator. Alternatively, LEDs that emit low-power visible wavelength light used for display in the vicinity of each near-infrared light source 2 may be mounted on a substrate, and the LEDs may be used as guide light.

  In the present embodiment, a position sensor 13 is provided. The position sensor 13 detects the contact position of the finger 4 and selectively turns on the near-infrared light source 2 according to the contact position of the finger 4. As a result, unnecessary light (disturbance light) other than the transmitted light that passes through the finger 4 can be prevented from directly entering the image sensor 10 and detection errors can be prevented.

  Since no light is emitted from the near-infrared light source 2 that does not correspond to the touched finger 4, ambient light can be prevented from directly entering the eyes of the operator, which is also effective from the viewpoint of eye safety.

  Further, when the position sensor 13 detects the placement of the finger 4 on the touch panel 3, it can also be used as a switch for starting an authentication operation. Furthermore, this detection can also be applied to detecting whether the contact posture is appropriate, such as whether the finger 4 in contact is rotating or not tilting.

Next, a second embodiment according to the present invention will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component equivalent to 1st Embodiment mentioned above, and the detailed description is abbreviate | omitted.

  The PC 7 includes an optical path length (object distance L) between the surface of the keyboard 14 and the display 15, or a setting unit 62 that presets an opening / closing angle of the PC 7, and an optical path length (object) between the surface of the keyboard 14 and the display 15. Distance L), or the position sensor 61 (third detection unit) that detects the angle, the optical path length or angle detected by the position sensor 61, and the optical path length or angle set by the setting unit 62 are close to each other A light source control unit 63 that controls the near-infrared light source 2 is provided.

  In the first embodiment described above, the object distance L between the light source casing 1 and the imaging casing 11 is obtained from Expression (4). However, when the operator adjusts the angle by opening and closing the PC 7 in this embodiment, the position sensor 61 detects the angle or the object distance L. The detected angle or object distance L is output to the light source control unit 63. The light source control unit 63 compares the angle or object distance L detected by the position sensor 61 with the angle or object distance L preset by the setting unit 62, and when the angle or object distance L is close to each other Then, light is emitted from the near-infrared light source 2 to inform the operator that the angle is sufficient to authenticate the vein pattern.

  As a result, the operator can authenticate the vein pattern simply by touching the touch panel 3 with the finger 4.

  In the present embodiment, the position sensor 61 detects the object distance L or the angle. The vein pattern is authenticated by determining whether or not the detected object distance L or angle is close to the preset object distance L or angle.

  Accordingly, the lighting operation of the light source for measuring the object distance L in the first embodiment and the measurement of the object distance L using the equation (4) are not required. Therefore, STEP8, STEP25, and STEP40 in FIGS. 12 to 14 can be omitted.

  Further, by appropriately setting the relationship between the opening angle of the PC 7 and the position sensor 61, the optical axis of the imaging housing 11 coincides with the light source housing 1 even when embedded in the PC 7 (without rotating). be able to. Therefore, the operator does not need to perform tilt correction by rotating the light source casing 1 and the imaging casing 11, and can quickly perform vein pattern authentication.

  As the position sensor 61, an angle sensor such as a rotary encoder that measures the angle between the keyboard 14 and the display 15 can be used. The object distance L is calculated from the detected angle. Further, as the position sensor 61, for example, a distance sensor configured to measure the distance between a predetermined portion of the keyboard 14 and a predetermined portion of the display 15 and configured by an LED and a photodetector can be used. The object distance L is calculated from the detected distance of the predetermined portion.

  Thus, this embodiment can adjust the angle by using the position sensor 61, and can make the distance between both housings constant with good reproducibility. Therefore, as described above, STEP8, STEP25, and STEP40 can be omitted. Thereby, this embodiment can shorten a procedure and processing time more.

Next, a third embodiment according to the present invention will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component equivalent to 1st, 2nd embodiment mentioned above, and the detailed description is abbreviate | omitted.

  In the present embodiment, in addition to the configuration of the second embodiment described above, the light source housing 1 is disposed above the display 15 and the imaging housing 11 is disposed near the surface of the keyboard 14, so that the light source housing in the second embodiment is arranged. In this configuration, the arrangement of the body 1 and the imaging housing 11 is switched.

  With this configuration, the present embodiment is effective from the viewpoint of eye safety because light is emitted downward from the near-infrared light source 2 so that it does not easily enter the eyes of the operator.

  In each of the embodiments described above, the light source casing 1 and the imaging casing 11 constituting the vein pattern sensor are provided in the PC 7 that can be folded as an example. However, the object distance between the light source and the imaging unit can be varied without being limited to the PC 7. The configuration is not limited to the configuration described above. For example, instead of the PC 7, a light source may be disposed on the keyboard side and the display side of a foldable mobile phone. In addition, a light source can be arranged on the body of the PDA that can be opened and closed, and an imaging unit can be arranged on the lid. Further, as a vein authentication unit other than the information terminal device, it may be provided in another device such as an open / close type vein authentication unit having only a light source and an imaging unit, or a cash dispenser.

It is an external appearance block diagram of the vein pattern sensor in 1st Embodiment which concerns on this invention. It is a figure explaining the rotation mechanism which made the light source housing | casing an example. It is a figure explaining the distance (object distance) from a light source housing (finger) to an imaging housing (lens). It is a figure explaining the distance (object distance) from a light source housing (finger) to an imaging housing (lens). It is the schematic side view which showed the shape of the general touch panel. It is a figure regarding the incident angle characteristic of a band pass filter. It is the schematic of the optical system in the vein pattern sensor in this embodiment. It is the top view which showed the example of an arrangement | sequence of a near-infrared light source. It is the top view which showed the example of an arrangement | sequence of a near-infrared light source. The positions of the light source housing and the imaging housing are relatively tilted around the X axis, and the four near infrared light sources are turned on. It is a figure shown about the structure of the position sensor provided in the light source housing. It is a flowchart of the basic operation | movement procedure in this embodiment. It is an example of the flowchart which replaces the order of an inclination and distance detection operation and an imaging operation, performs an inclination and distance detection operation after imaging, and then performs image correction and vein pattern authentication. It is a flowchart for demonstrating in detail the procedure shown in FIG. It is a side view of PC in the folded state. It is an external appearance block diagram of the vein pattern sensor in 2nd Embodiment which concerns on this invention. It is an external appearance block diagram of the vein pattern sensor in 3rd Embodiment which concerns on this invention. It is a schematic perspective view of the conventional authentication apparatus. It is the schematic of the authentication apparatus shown in FIG. It is the schematic of the conventional authentication apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light source housing, 2 ... Light source part (near-infrared light source), 2A ... Light source, 2B ... Light source, 2C ... Light source, 3 ... Touch panel, 4 ... Finger, 5 ... Turning center part, 6 ... Shooting angle of view, DESCRIPTION OF SYMBOLS 7 ... PC, 8 ... Band pass filter, 9 ... Imaging lens, 10 ... Imaging part (imaging element), 11 ... Imaging housing, 12 ... Center of rotation, 13 ... Position sensor, 14 ... Keyboard, 15 ... Display, DESCRIPTION OF SYMBOLS 20 ... Upper film, 21 ... ITO, 22 ... Lower glass, 23 ... Dot spacer, 24 ... Arrow, 41 ... Turning center axis, 42 ... Leaf spring, 43 ... Gear, 61 ... Position sensor, 62 ... Setting part, 63 ... light source control unit.

Claims (13)

A light source that emits light that passes through the subject;
A first holding unit for holding the light source;
An imaging unit for imaging the light;
A second holding unit for holding the imaging unit;
A variable unit that connects the connection unit of the first holding unit and the connection unit of the second holding unit, and makes the light source and the imaging unit face each other by changing a relative distance between the light source and the imaging unit. ,
A first detector for detecting the relative distance;
A light source controller that controls emission of the light when the first detector detects the relative distance;
A vein pattern sensor characterized by comprising:   The variable portion is rotated relative to each other around the connecting portion of the first holding portion and the connecting portion of the second holding portion, and the first holding portion and the second holding portion are connected to each other. The vein pattern sensor according to claim 1, wherein the holding portion is configured to be openable and closable.   The vein pattern sensor according to claim 1, wherein the imaging unit is held by an imaging housing, and the imaging housing has an imaging tilt adjustment mechanism that adjusts a relative tilt with respect to the second holding member. .   The vein pattern sensor according to claim 3, wherein the imaging tilt adjustment mechanism adjusts the relative tilt of the light source and the imaging unit.   The vein pattern sensor according to claim 1, wherein the light source is held by a light source casing, and the light source casing has a light source tilt adjustment mechanism that adjusts a relative tilt with respect to the first holding member.   The vein pattern sensor according to claim 5, wherein the light source tilt adjusting mechanism adjusts the relative tilt between the light source and the imaging unit.   The vein pattern sensor according to claim 5, wherein the light source casing includes a placement portion on which the subject is placed.   The vein pattern sensor according to claim 7, wherein when the subject is placed on the placement section, the light source is turned on as guide light. The placement section is
A contact portion in contact with the subject;
A second detection unit that detects an external range of the subject based on contact information output from the contact unit when the subject is brought into contact with the contact unit;
Comprising
The vein pattern according to claim 7, wherein the light source irradiates the light toward the subject within an outline range of the subject based on detection information output from the second detection unit. Sensor.   The first detection unit includes a distance between the light sources, and a distance between the light projected on the imaging unit when the light emitted from the plurality of light source units is captured by the imaging unit. The vein pattern sensor according to claim 1, wherein the relative distance is detected based on a ratio of.   When at least four of the light sources emit the light, the imaging unit captures an image having four light spots, and the first detection unit is configured based on the distance between the light spots. The vein pattern sensor according to claim 1, wherein a relative inclination between the housing and the imaging housing is detected. A setting unit for setting the relative distance between the light source unit and the imaging unit;
Further comprising
When the relative distance detected by the first detection unit is close to the relative distance set by the setting unit, the light source control unit controls the light source to emit the light. The vein pattern sensor according to claim 1. A light source that emits light that passes through the subject;
A first holding unit for holding the light source;
An imaging unit for imaging the light;
A second holding unit for holding the imaging unit;
The connection part of the first holding part and the connection part of the second holding part are connected, and at least one of the connection part of the first holding part and the connection part of the second holding part is relatively centered. The relative distance between the light source and the imaging unit is varied by rotating it, and a variable unit that makes the light source and the imaging unit face each other,
A first detector for detecting the relative distance;
A light source controller that controls emission of the light when the first detector detects the relative distance;
A vein pattern sensor characterized by comprising:

Images