WO2022195766A1 - 検査治具、検査装置、及び検査方法 - Google Patents
検査治具、検査装置、及び検査方法 Download PDFInfo
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- WO2022195766A1 WO2022195766A1 PCT/JP2021/010837 JP2021010837W WO2022195766A1 WO 2022195766 A1 WO2022195766 A1 WO 2022195766A1 JP 2021010837 W JP2021010837 W JP 2021010837W WO 2022195766 A1 WO2022195766 A1 WO 2022195766A1
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- input device
- contact surface
- inspection
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- test chart
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Definitions
- This disclosure relates to an inspection jig, an inspection apparatus, and an inspection method.
- Patent Document 1 discloses an imaging device that images a fingerprint via a prism.
- the imaging device disclosed in Patent Document 1 captures an image of a fingerprint using two imaging units via a prism.
- An imaging device for imaging skin patterns as disclosed in Patent Document 1 inspects the optical characteristics of the optical axis and angle of view in the imaging range in order to confirm that the optical characteristics of the product performance are appropriate during the manufacturing process.
- the imaging range is the prism surface with which a fingerprint contacts.
- test charts for measuring optical properties rather than actual human skin.
- the imaging device disclosed in Patent Document 1 is a prism type that utilizes the difference between the refractive index of human skin (approximately 1.4) and the refractive index of air (approximately 1.0). For this reason, when using a test chart printed on photographic paper or film, which is commonly used for optical inspection, it is necessary to remove the air between the prism and the test chart, making stable optical inspection difficult. .
- the purpose of this disclosure is to provide an inspection jig, an inspection apparatus, and an inspection method that enable stable optical inspection in view of the above-described problems.
- An inspection jig which is one aspect of this disclosure, has a contact surface that comes into contact with an imaging surface of a skin pattern input device, and has grooves provided on the contact surface and connected to an outer edge of the contact surface.
- An inspection apparatus which is one aspect of the present disclosure, includes image acquisition means for acquiring an image of the contact surface imaged by the skin pattern input device using the inspection jig, which is one aspect of the disclosure, and the image acquisition means.
- optical characteristic calculation means for calculating optical characteristics of the skin pattern input device based on the acquired image; and determination of the state of the skin pattern input device based on the optical characteristics calculated by the optical characteristic calculation means. and determination means.
- An inspection method which is one aspect of the present disclosure, includes an inspection jig having a contact surface that contacts an imaging surface of a skin pattern input device, and a groove provided on the contact surface and connected to an outer edge of the contact surface. obtaining an image of the contact surface captured by the skin pattern input device using the inspection jig, calculating optical characteristics of the skin pattern input device based on the image, and based on the optical characteristics to determine the state of the skin pattern input device.
- FIG. 1 is a perspective view of a test chart in the first embodiment of this disclosure
- FIG. 4 is a front view of the contact surface of the test chart in the first embodiment of this disclosure
- FIG. 1 is a cross-sectional view showing a schematic configuration of a fingerprint input device to be tested using a test chart
- FIG. 1 is a schematic configuration diagram of an inspection system according to a second embodiment of this disclosure
- FIG. 7 is a flow chart describing a method for inspecting optical characteristics of a fingerprint input device using a test chart and an inspection device in a second embodiment of the present disclosure
- 1 is a photograph of an image captured with a fingerprint imaging camera
- 1 is a photograph of an image captured with a natural imaging camera
- FIG. 12 is a front view of the contact surface of the test chart of the third embodiment of this disclosure
- FIG. 11 is a schematic configuration diagram of an inspection system according to a fourth embodiment of this disclosure
- FIG. 11 is a flow chart describing a method for inspecting optical characteristics of a fingerprint input device using a test chart and an inspection device in a fourth embodiment of the present disclosure
- FIG. FIG. 12 is a front view of the contact surface of the test chart in the fifth embodiment of this disclosure
- FIG. 1 is a perspective view of a test chart 1 (inspection jig) according to the first embodiment of this disclosure.
- the test chart 1 includes a contact surface 1a that is brought into contact with an imaging surface 103a of a fingerprint input device 100 (skin pattern input device) to be tested, and a peripheral surface 1b provided along an outer edge 1a1 of the contact surface 1a. It is formed in a block shape with The test chart 1 of this embodiment is made of silicon resin having a refractive index (approximately 1.4) close to that of human skin.
- FIG. 2 is a front view of the contact surface 1a of the test chart 1.
- FIG. 1a of the test chart 1 is provided with grooves 2.
- the groove portion 2 discharges the air present between the contact surface 1a and the imaging surface to the outside from the interface between the contact surface 1a and the imaging surface. It is a guide road.
- groove 2 is used as a test pattern for inspecting the optical characteristics of fingerprint input device 100 .
- the groove portion 2 is formed so as to be recessed from the contact surface 1a with a constant depth dimension, and has one frame-shaped portion 3 and a plurality of (four in this embodiment) connection portions 4 .
- the frame-shaped portion 3 is formed in a rectangular shape when viewed from the normal direction of the contact surface 1a. That is, the frame-shaped portion 3 is provided in an annular shape.
- the frame-shaped portion 3 includes a pair of long side portions (first long side portion 3a and second long side portion 3b) and a pair of short side portions (first short side portion 3c and second short side portion 3d). have.
- One end of the first long side portion 3a is connected to one end of the first short side portion 3c
- the other end of the first long side portion 3a is connected to one end of the second short side portion 3d
- the second long side portion 3b is connected to one end of the second short side portion 3d.
- the frame-shaped portion 3 is formed in a rectangular shape as described above. A region surrounded by such a frame-shaped portion 3 is used as a central region R used when inspecting optical characteristics of the fingerprint input device 100 . In other words, the ring-shaped frame-shaped portion 3 forms the central region R used when inspecting the optical characteristics of the fingerprint input device 100 .
- the connecting portion 4 is a portion that connects the frame-shaped portion 3 and the outer edge 1a1 of the contact surface 1a.
- four connecting portions 4 are provided. As shown in FIGS. 1 and 2, one connecting portion 4 is formed linearly to connect the center of the first long side portion 3a and the outer edge 1a1. One connecting portion 4 is formed linearly to connect the center of the second long side portion 3b and the outer edge 1a1. One connecting portion 4 is formed linearly to connect the center of the first short side portion 3c and the outer edge 1a1. One connection portion 4 is formed linearly to connect the center of the second short side portion 3d and the outer edge 1a1. Since the peripheral surface 1b is formed along the outer edge 1a1 of the contact surface 1a as described above, each connecting portion 4 connects the frame-shaped portion 3 and the peripheral surface 1b.
- the horizontal direction of the optical characteristics of the natural image camera, which will be described later, provided in the fingerprint input device 100 is the length of the frame-shaped portion 3.
- the direction is along the edge.
- the vertical direction in the optical characteristics of the natural image camera is the direction along the short side of the frame-shaped portion 3 . Therefore, as shown in FIG. 2, an imaginary line segment extending parallel to the long side and arranged in the center of the short side in the length direction is referred to as a horizontal center line L1.
- An imaginary line segment extending parallel to the short side and arranged in the center of the long side in the length direction is referred to as a vertical center line L2.
- the groove portion 2 serves as a flow path through which air flows when the contact surface 1 a is pressed against the imaging surface of the fingerprint input device 100 . Since the connecting portion 4 of the groove portion 2 is connected to the outer edge 1a1 (peripheral surface 1b) of the contact surface 1a, the air flowing through the groove portion 2 is discharged to the outside of the test chart 1.
- FIG. As described above, the test chart 1 of the present embodiment has a structure in which the silicon resin surface (contact surface 1a) in contact with the imaging surface of the fingerprint input device 100 allows air to easily escape to the periphery. Further, the groove portion 2 also serves as a pattern (guide) for inspecting the optical axis and the angle of view in the optical inspection of the fingerprint input device 100 .
- the contact surface 1a is preferably mirror-finished so that excess air does not enter between the contact surface 1a and the imaging surface 103a of the fingerprint input device 100.
- test chart 1 uses a material (silicon resin) with a refractive index close to that of human skin, the contact surface 1a can be clearly imaged.
- the portion of the groove 2 that does not contact the imaging surface becomes an air layer. Therefore, the contrast in the portion where the groove 2 is provided becomes a very low value.
- the optical axis and the angle of view can be calculated from the position of the groove 2 in the captured image, and the optical characteristics can be inspected. A method for inspecting the optical characteristics will be described in detail in a later embodiment.
- FIG. 3 is a cross-sectional view showing a schematic configuration of the fingerprint input device 100 tested using the test chart 1.
- the fingerprint input device 100 is a device that captures an image of a fingerprint on the end of a finger (end of a human finger) and outputs the captured image. Note that the device to be tested using the test chart 1 is not limited to the fingerprint input device 100 .
- a skin pattern input device that captures a skin pattern such as a palm print input device that captures a palm print, is to be inspected.
- the skin pattern input devices to be inspected have substantially the same configuration except for the size of the imaging surface. Therefore, here, the fingerprint input device 100 will be described as a representative.
- the fingerprint input device 100 includes a white light LED board 101, a near-infrared light LED board 102, a prism 103, a fingerprint imaging camera 104, a natural image imaging camera 105, and a control board 106. It has
- the white light LED substrate 101 is provided below the prism 103, has visible light LEDs such as white LEDs (light emitting diodes), and outputs white light upward in FIG.
- White light includes visible light components with wavelengths of approximately 380 to 800 nm.
- White light enters the interior of the prism 103 from the opposing surface 103b side of the prism 103, and irradiates the fingertip placed on the imaging surface 103a of the prism 103 (the contact surface 1a of the test chart 1 during inspection). be.
- the near-infrared light LED substrate 102 is provided so as to surround the prism 103 from the sides, has a plurality of near-infrared light LEDs, and outputs near-infrared light having a longer wavelength than white light.
- Near-infrared light includes an infrared light component with a wavelength of approximately 800 nm to 1000 nm.
- a light guide 107 for guiding near-infrared light is arranged between the near-infrared light LED substrate 102 and the side of the imaging surface 103a of the prism 103 . By being guided by the light guide 107, the near-infrared light is irradiated along the imaging surface 103a to the finger end (the contact surface 1a of the test chart 1 during inspection).
- the light guide 107 is arranged so as to surround the imaging surface 103a.
- the test chart 1 of this embodiment is formed in a shape that fits within the range surrounded by the light guide 107 . That is, the test chart 1 is formed so that the peripheral surface 1b of the test chart 1 contacts the light guide 107 when the contact surface 1a of the test chart 1 contacts the imaging surface 103a.
- the prism 103 has an imaging surface 103a on which a finger end to be imaged is placed, and a facing surface 103b facing the imaging surface 103a.
- This prism 103 is a polyhedron (for example, a hexahedron) having a refractive index different from that of air, and can be formed of, for example, glass, crystal, or the like.
- the facing surface 103b may or may not be parallel to the imaging surface 103a.
- the surface on which the fingerprint imaging camera 104 is arranged to face is an intersecting surface 103c that intersects with the imaging surface 103a at a predetermined angle.
- a surface 103d located on the opposite side of the intersecting surface 103c is coated with black paint or the like in order to increase the contrast of the image.
- a blackboard may be pasted instead of applying black paint.
- the fingerprint imaging camera 104 captures an image of the finger end, which is the object (the contact surface 1a of the test chart 1 during inspection) from the intersection surface 103c side.
- the fingerprint imaging camera 104 has an imaging device such as a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor, and converts the input visible light component and infrared light component into an image signal. Output.
- CMOS Complementary Metal Oxide Semiconductor
- CCD Charge Coupled Device
- the natural image capturing camera 105 captures an image of the finger end (the contact surface 1a of the test chart 1 during inspection), which is an object, from the facing surface 103b side.
- the natural image pickup camera 105 has an image pickup device such as a CMOS image sensor or a CCD image sensor and an infrared light cut filter, converts the input visible light component into an image signal, and outputs the image signal.
- the natural image capturing camera 105 has low sensitivity to near-infrared light.
- the natural image capturing camera 105 does not have an infrared light cut filter, and for example, image processing or the like may be used to obtain the same effect as when an infrared light cut filter is provided.
- the control board 106 is a board on which arithmetic circuit chips for arithmetic processing and memory chips for storage are mounted.
- the control board 106 controls the fingerprint imaging camera 104 and the natural image imaging camera 105 . That is, the control board 106 causes the fingerprint imaging camera 104 to image the fingerprint (the contact surface 1a of the test chart 1 during inspection). Further, the control board 106 causes the natural image capturing camera 105 to capture the fingerprint (the contact surface 1a of the test chart 1 during inspection).
- the control board 106 also controls the white light LED board 101 and the near infrared light LED board 102;
- the fingertip When imaging a fingerprint with such a fingerprint input device 100 , the fingertip is placed on the imaging surface 103 a of the prism 103 .
- the white light output from the white light LED substrate 101 is reflected by the ridges and valleys of the fingerprint and enters the prism 103 .
- the near-infrared light output by the near-infrared light LED substrate 102 is transmitted through the finger end, emitted from the ridges and valleys of the fingerprint placed on the imaging surface 103a, and emitted from the imaging surface 103a. Incident into the prism 103 .
- the ridges of the fingerprint are in contact with the imaging surface 103a. Therefore, the refractive index of light incident from or reflected by the ridge is substantially the same as the refractive index of the prism 103 (glass or the like). Therefore, the light emitted from or reflected by the ridge can be considered in the same way as the light reflected by the imaging surface 103a, and is emitted substantially uniformly in almost all directions within the prism 103. All areas below 103a are reached.
- the valley line portion of the fingerprint is not in contact with the imaging surface 103a, and there is an air layer between the valley line portion and the imaging surface 103a. Therefore, the emitted light from the valley line portion or the reflected light from the valley line portion enters the imaging surface 103a through the air layer.
- the refractive index of air is 1.0.
- the refractive index of glass is generally around 1.5 and in the range of 1.3 to 2.0.
- the refractive index of water and skin is 1.3-1.4. Since there is a difference in refractive index between them, the emitted light and reflected light from the troughs undergo a refraction phenomenon different from that of the emitted light and reflected light from the ridges.
- emitted light and reflected light from the valley line portion are not radiated in all directions. Also, since the angle of refraction is smaller than the angle of incidence, the emitted light from the valley line and the reflected light from the valley line are polarized downward within the prism 103 .
- the light from the ridges is emitted from the imaging surface 103a substantially uniformly in all directions, and the light from the valleys is biasedly emitted downward from the imaging surface 103a.
- the angle of incidence on the intersecting surface 103c is greater than that of the light from the ridges. Therefore, compared with the light from the ridge, the incidence angle of the light from the trough is more likely to exceed the critical angle, and the light is totally reflected by the intersecting surface 103c. Therefore, more light from the ridges than from the valleys reaches the fingerprint imaging camera 104 that images the finger ends from the intersecting surface 103c side. Therefore, the image captured by the fingerprint imaging camera 104 is an image in which the ridges are bright and the valleys are dark, resulting in a high-contrast fingerprint image (hereinafter referred to as a high-contrast image).
- the finger end is illuminated with white light from the facing surface 103b side, and is illuminated with near-infrared light from the peripheral portion of the imaging surface 103a.
- the near-infrared light can brighten the periphery of the fingertip where white light cannot easily reach.
- the fingerprint imaging camera 104 can image the fingerprint with the entire fingerprint properly illuminated. Therefore, according to the fingerprint input device 100, the contrast can be increased over the entire fingerprint image.
- the natural image capturing camera 105 that captures an image of the fingertip from the facing surface 103b side
- the light from the ridge and the light from the valley line reach the fingerprint capturing camera 104 at roughly reach in equal proportions.
- the image captured by the natural image capturing camera 105 is the same image as when the fingertip placed on the image capturing surface 103a is viewed directly from the opposing surface 103b.
- the image captured by the natural image capturing camera 105 is an image in which the infrared light component is suppressed. Therefore, the image captured by the natural image capturing camera 105 is a natural image of the fingertip (hereinafter referred to as a natural image).
- a high-contrast image captured by the fingerprint imaging camera 104 is used for fingerprint collation, for example.
- the fingerprint imaging camera 104 can capture a high-contrast fingerprint image over the entire area, so that the accuracy of fingerprint collation can be easily improved.
- the natural image captured by the natural image capturing camera 105 is used, for example, to determine whether it is a fake or genuine.
- the test chart 1 of the present embodiment is used for a pass/fail test of optical characteristics that is performed when the fingerprint input device 100 is manufactured.
- the fingerprint input device 100 may be inspected using the test chart 1 not only during manufacturing but also during maintenance or the like.
- the contact surface 1 a of the test chart 1 is directed downward, and the contact surface 1 a is brought into contact with the imaging surface 103 a of the fingerprint input device 100 .
- the contact surface 1a is imaged.
- the white light output from the white light LED substrate 101 is reflected by the contact surface 1 a of the test chart 1 and enters the prism 103 .
- Near-infrared light output from the near-infrared light LED substrate 102 passes through the peripheral surface 1b of the test chart 1, is emitted from the contact surface 1a of the test chart 1, and enters the prism 103 from the imaging surface 103a.
- a portion of the contact surface 1a excluding the groove portion 2 (hereinafter referred to as a contact portion) is in contact with the imaging surface 103a. Therefore, the refractive index of light incident from the contact portion or reflected from the contact portion is substantially the same as the refractive index of the prism 103 (glass or the like). Therefore, the light emitted from the contact site or reflected by the contact site can be considered in the same way as the light reflected by the imaging surface 103a. Reaches all areas of the underside.
- the groove 2 is not in contact with the imaging surface 103a, and there is an air layer between the inner wall surface of the groove 2 and the imaging surface 103a. Therefore, the light emitted from the groove 2 or the light reflected by the groove 2 enters the imaging surface 103a through the air layer.
- the refractive index of air is 1.0.
- the refractive index of glass is generally around 1.5 and in the range of 1.3 to 2.0.
- the refractive index of the test chart 1 is close to the refractive index of human skin (about 1.4). Since there is a difference in refractive index between them, the emitted light and the reflected light from the groove 2 undergo a refraction phenomenon different from that of the emitted light and the reflected light from the contact portion.
- the emitted light and the reflected light from the groove 2 are not radiated in all directions. Also, since the angle of refraction is smaller than the angle of incidence, the outgoing light from the groove 2 and the reflected light from the groove 2 are polarized downward in the prism 103 .
- the light from the contact portion is emitted from the imaging surface 103a almost uniformly in all directions, and the light from the groove portion 2 is biased downward from the imaging surface 103a.
- the angle of incidence on the intersecting surface 103c is larger than that of the light from the contact portion. Therefore, compared with the light from the contact portion, the incidence angle of the light from the groove portion 2 exceeds the critical angle at a higher rate, and the light is totally reflected at the intersecting surface 103c at a higher rate. Therefore, more light from the contact portion than from the groove portion 2 reaches the fingerprint imaging camera 104 from the intersecting surface 103c side. Therefore, the image captured by the fingerprint imaging camera 104 is a high-contrast image in which the contact area is bright and the groove 2 is dark.
- the test chart 1 when taking an image, the test chart 1 is illuminated with white light from the opposing surface 103b side, and is illuminated with near-infrared light from the peripheral portion of the imaging surface 103a.
- near-infrared light can brighten the vicinity of the outer edge 1a1 of the test chart 1, which is difficult for white light to reach. Therefore, the fingerprint imaging camera 104 can image the contact surface 1a while the entire contact surface 1a is appropriately illuminated. Therefore, according to the fingerprint input device 100, the contrast can be increased over the entire image of the contact surface 1a.
- the light from the contact portion and the light from the groove portion 2 reach the natural image capturing camera 105 that captures the contact surface 1a from the facing surface 103b side, and the light from the groove portion 2 reaches the fingerprint capturing camera 104 at a substantially equal rate. reach a percentage.
- the image captured by the natural image capturing camera 105 is the same image as when the fingertip placed on the image capturing surface 103a is viewed directly from the opposing surface 103b.
- the image captured by the natural image capturing camera 105 is an image in which the infrared light component is suppressed. Therefore, the image captured by the natural image capturing camera 105 is a natural image of the contact surface 1a.
- the pass/fail inspection of the optical characteristics of the fingerprint input device 100 is performed. Specifically, the optical characteristics of the fingerprint imaging camera 104 are inspected based on the high-contrast image of the contact surface 1a captured by the fingerprint imaging camera 104 described above. Also, the optical characteristics of the natural image capturing camera 105 are inspected based on the natural image of the contact surface 1a captured by the natural image capturing camera 105 described above. The details of the optical characteristic inspection based on such an image will be described in a later embodiment.
- the test chart 1 of this embodiment as described above has a contact surface 1a that is brought into contact with the imaging surface 103a of the fingerprint input device 100 .
- the test chart 1 also has a groove 2 provided on the contact surface 1a and connected to the outer edge 1a1 of the contact surface 1a. Therefore, when the contact surface 1a is pressed against the imaging surface 103a of the fingerprint input device 100, the air between the contact surface 1a and the imaging surface 103a flows through the groove 2 and is discharged to the outside of the test chart 1. . Therefore, the use of the test chart 1 of this embodiment enables stable optical inspection.
- the groove portion 2 has an annular frame-shaped portion 3 and a connection portion 4 that connects the frame-shaped portion 3 and the outer edge 1a1 of the contact surface 1a. For this reason, air between the contact surface 1a and the imaging surface 103a can be discharged, and the shape of the frame-shaped portion 3 can be used, for example, as an optical characteristic inspection pattern. An inspection method using the shape of the frame-shaped portion 3 will be described in detail in a later embodiment.
- connection portions 4 are provided with respect to the frame-shaped portion 3 . Therefore, air can be discharged from the interface between the contact surface 1 a and the imaging surface 103 a of the fingerprint input device 100 via each connecting portion 4 . Therefore, it becomes possible to discharge air more efficiently and reliably.
- test chart 1 of this embodiment is formed using silicone resin having a refractive index close to that of human skin. That is, the contact surface 1a is made of silicon resin. Therefore, the contact surface 1a can be clearly imaged.
- FIG. 4 is a schematic configuration diagram of the inspection system 10 of this embodiment. As shown in this figure, an inspection system 10 of this embodiment includes the test chart 1 of the first embodiment and an inspection device 20 .
- the inspection device 20 is a device that detects the optical characteristics of the fingerprint input device 100 to be inspected and performs pass/fail reversal as to whether the optical characteristics have performance within a predetermined range.
- the inspection apparatus 20 includes an installation base 21 (fixing means), a pressure base 22, a weight 23, an actuator 24, and a control calculation section 25. As shown in FIG.
- the installation table 21 is a table on which the fingerprint input device 100 to be inspected is installed, and fixes the fingerprint input device 100 at the inspection position.
- the pressure table 22 is a table that abuts from above the test chart 1 whose contact surface 1a is in contact with the imaging surface 103a of the fingerprint input device 100, and is supported so as to be able to move up and down.
- the weight 23 is placed on the pressure table 22 and supported by the pressure table 22 . Incidentally, as shown in FIG. 4, the number of weights 23 can be changed.
- the actuator 24 is a device that lifts and lowers the pressure table 22 by vertically extending and contracting a rod under the control of the control calculation unit 25 , and is fixed to the installation table 21 . Further, the actuator 24 can adjust the supporting force of the pressure table 22, and is configured to be able to adjust the load acting on the test chart 1 from the pressure table 22 by adjusting the supporting force.
- the contact surface 1a of the test chart 1 is pressed against the imaging surface 103a of the fingerprint input device 100 by interlocking the pressure table 22, the weight 23, and the actuator 24.
- the pressure base 22 , the weight 23 , and the actuator 24 constitute the pressing portion 26 that presses the contact surface 1 a of the test chart 1 against the imaging surface 103 a of the fingerprint input device 100 .
- the inspection apparatus 20 including the control calculation unit 25 without the installation table 21 , the pressure table 22 , the weight 23 and the actuator 24 .
- the control calculation unit 25 is, for example, a computer having hardware such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a communication module. As shown in FIG. 4, the control calculation unit 25 includes an actuator control unit 30, a fingerprint input device control unit 31, an image acquisition unit 32 (image acquisition means), and a It has an optical characteristic calculation section 33 (optical characteristic calculation means), a storage section 34, and a determination section 35 (determination means).
- a CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the control calculation unit 25 includes an actuator control unit 30, a fingerprint input device control unit 31, an image acquisition unit 32 (image acquisition means), and a It has an optical characteristic calculation section 33 (optical characteristic calculation means), a storage section 34, and a determination section 35 (determination means).
- the actuator control unit 30 controls the actuator 24 and causes the actuator 24 to raise and lower the pressure table 22 . Further, the actuator control unit 30 controls the actuator 24 to adjust the supporting force of the pressure table 22 and the pressing force acting on the test chart 1 .
- the fingerprint input device control unit 31 is connected to the fingerprint input device 100 fixed to the installation base 21 and controls the entire fingerprint input device 100 through the control board 106 of the fingerprint input device 100 . That is, the fingerprint input device control section 31 causes the fingerprint imaging camera 104 and the natural image imaging camera 105 of the fingerprint input device 100 to image the contact surface 1 a of the test chart 1 .
- the image acquisition unit 32 captures the image of the contact surface 1a of the test chart 1 captured by the fingerprint imaging camera 104 and the natural image imaging camera 105 of the fingerprint input device 100. In other words, the image acquisition unit 32 acquires an image of the contact surface 1 a captured by the fingerprint input device 100 using the test chart 1 .
- the optical characteristic calculation unit 33 calculates optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquisition unit 32 .
- the optical characteristic calculator 33 calculates the optical axes of the fingerprint imaging camera 104 and the natural image imaging camera 105 and the angles of view of the fingerprint imaging camera 104 and the natural image imaging camera 105 as the optical characteristics of the fingerprint input device 100 .
- the optical characteristic calculator 33 When calculating the optical axis, the optical characteristic calculator 33 first uses the position of the groove portion 2 included in the image as a reference to calculate the above-described horizontal center line L1 (first reference line along the contact surface 1a) and the above-described defines a vertical center line L2 (a second reference line along the contact surface 1a and perpendicular to the first reference line). Subsequently, the optical characteristic calculator 33 calculates the optical axis position based on the intersection position between the horizontal center line L1 and the vertical center line L2.
- the optical characteristic calculator 33 when calculating the optical axis of the fingerprint imaging camera 104, the optical characteristic calculator 33 first uses the position of the groove 2 included in the image captured by the fingerprint imaging camera 104 as a reference, and calculates the horizontal center line. Define L1 and a vertical centerline L2. Subsequently, the optical characteristic calculator 33 calculates the optical axis position of the fingerprint imaging camera 104 based on the intersection position of the horizontal center line L1 and the vertical center line L2.
- the optical characteristic calculating unit 33 first uses the position of the groove portion 2 included in the image captured by the natural image capturing camera 105 as a reference, and the horizontal center line L1 and the define a vertical centerline L2. Subsequently, the optical characteristic calculator 33 calculates the optical axis position of the natural image capturing camera 105 based on the position of intersection between the horizontal center line L1 and the vertical center line L2.
- the optical characteristic calculator 33 determines the length of the fingerprint imaging camera 104 and the natural image imaging camera 105 based on the length of the horizontal center line L1 and the length of the vertical center line L2. Calculate the angle of view. More specifically, when calculating the angle of view of the fingerprint imaging camera 104, the optical characteristic calculator 33 calculates the length of the horizontal center line L1 and the vertical center line L2 from the image captured by the fingerprint imaging camera 104. , and the angle of view of the fingerprint imaging camera 104 is calculated from these length dimensions.
- the optical characteristic calculating unit 33 calculates the length of the horizontal center line L1 and the length of the vertical center line L2 from the image captured by the natural image capturing camera 105. , and the angle of view of the natural image capturing camera 105 is calculated from these length dimensions.
- the storage unit 34 stores various data, for example, the judgment reference value for judging the pass/fail of the optical characteristics by the judging unit 35 .
- the design value of the optical axis position of the fingerprint imaging camera 104, the design value of the angle of view of the fingerprint imaging camera 104, the design value of the optical axis position of the natural image imaging camera 105, and the natural image imaging is stored.
- the determination unit 35 determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristics calculation unit 33 .
- the state of the fingerprint input device 100 referred to here means whether or not the various optical characteristics calculated by the optical characteristic calculation unit 33 fall within a predetermined range with respect to the design values of the various optical characteristics stored in the storage unit 34. or When the various optical characteristics calculated by the optical characteristic calculation unit 33 are within a predetermined range with respect to the design values of the various optical characteristics stored in the storage unit 34, the determination is normal. On the other hand, when the various optical characteristics calculated by the optical characteristic calculation unit 33 are out of the predetermined range with respect to the design values of the various optical characteristics stored in the storage unit 34, it is judged to be abnormal.
- step S101 the dimensions of the horizontal center line L1 and vertical center line L2 of the test chart 1 actually used for inspection are measured (step S101).
- the dimensions measured in step S101 are used when calculating the optical axis and angle of view in steps S207 and S212 described later in the inspection of the optical characteristics of the fingerprint input device 100 .
- the measurement in step S101 does not have to be performed every time the fingerprint input device 100 is tested. Since the objective is to reflect individual differences in the dimensions of the test chart 1 , this is performed for each individual test chart 1 that is actually used to inspect the fingerprint input device 100 .
- Step S201 the actuator 24 is operated, and the pressure table 22 and the pressure adjustment weight 23 are moved to a position where the fingerprint input device 100 can be installed.
- the actuator 24 is controlled by the actuator control section 30 of the control calculation section 25 .
- the fingerprint input device 100 is installed in accordance with the inspection position on the installation table 21 (step S202).
- the test chart 1 is installed so as to be in contact with the light guide 107 and the prism 103 and in such a manner that the contact surface 1a is in contact with the imaging surface 103a. Installation of the fingerprint input device 100 and the test chart 1 is performed by an operator or a working robot.
- the actuator 24 is operated to move the pressing table 22 and the weight 23 in the direction (downward in this embodiment) in which the test chart 1 is pressed against the imaging surface 103a of the fingerprint input device 100 (step S204).
- the amount of pressurization (pressing force) can be adjusted by the dead weight of the weight 23 for pressurization adjustment. Further, by adjusting the supporting force of the weight 23 (pressing table 22) of the actuator 24, the amount of pressurization (pressing force) can be further adjusted. In this embodiment, as an example, the amount of pressure (pressing force) is adjusted to about 10N.
- the actuator 24 is controlled by the actuator control section 30 of the control calculation section 25 .
- step S204 By moving the pressure table 22 in step S204, the test chart 1 is pressed toward the imaging surface 103a of the fingerprint input device 100. At this time, the air layer between the contact surface 1a of the test chart 1 and the imaging surface 103a of the fingerprint input device 100 is removed by the grooves 2 of the test chart 1. FIG. As a result, the fingerprint imaging camera 104 is ready for imaging the test chart 1 .
- the fingerprint imaging camera 104 is optically inspected (steps S205 to S209).
- the fingerprint input device control section 31 of the control calculation section 25 outputs a command to the control board 106 of the fingerprint input device 100 .
- the control board 106 controls the LEDs of the near-infrared light LED board 102 to emit near-infrared light.
- the command to the control board 106 does not necessarily have to be output by the control calculation unit 25 . For example, an operator may directly operate the control board 106 of the fingerprint input device 100 .
- the test chart 1 is imaged by the fingerprint imaging camera 104 (step S205).
- a light guide 107 guides near-infrared light, which serves as a light source, to irradiate the peripheral surface 1 b of the test chart 1 . Part of the near-infrared light incident on the test chart 1 is irradiated onto the imaging surface 103 a of the prism 103 .
- a portion (contact portion) of the contact surface 1a of the test chart 1 other than the groove portion 2 contacts the prism 103 without air. Since the refractive index of silicone resin (approximately 1.4) and the refractive index of optical glass prisms (approximately 1.5) are substantially the same, the near-infrared light travels substantially straight at the contact portion. Therefore, the fingerprint imaging camera 104 can capture a high-contrast image of the contact site.
- the portion of the groove 2 comes into contact with the prism 103 through air. Due to the difference between the refractive index of silicone resin (approximately 1.4) and the refractive index of air (approximately 1.0), near-infrared light cannot travel straight and is diffusely reflected between the contact surface 1a and the contact surface of air. Therefore, the fingerprint imaging camera 104 captures an image of the groove 2 as a low-contrast image.
- the fingerprint imaging camera 104 When the contact surface 1a of the test chart 1 is imaged by the fingerprint imaging camera 104 in this manner, the fingerprint imaging camera 104 outputs image data.
- the image acquisition unit 32 of the control calculation unit 25 acquires the image of the contact surface 1a of the test chart 1 captured by the fingerprint imaging camera 104 by acquiring image data output from the fingerprint imaging camera 104 .
- step S206 image analysis is performed to obtain information necessary for calculating the optical axis and angle of view of the fingerprint imaging camera 104 (step S206).
- This image analysis will be described using an image actually captured by the fingerprint imaging camera 104 .
- FIG. 6 is a photograph of an image captured by fingerprint imaging camera 104 .
- dashed arrows, lead lines and symbols in FIG. 6 are added for explanation and are not included in the actual image.
- image analysis a central region R surrounded by the frame-shaped portion 3 of the groove portion 2 is extracted from the image captured by the fingerprint imaging camera 104 .
- the number of pixels on the horizontal center line L1 and the number of pixels on the vertical center line L2 of the extracted central region R are measured.
- the optical axis and angle of view of the fingerprint imaging camera 104 are calculated (step S207).
- the optical axis position of the fingerprint imaging camera 104 is calculated from the difference between the intersection of the horizontal center line L1 and the vertical center line L2 obtained by image analysis and the optical axis design value of the fingerprint input device 100.
- FIG. For the angle of view of the fingerprint imaging camera 104, the actual dimensions corresponding to one pixel were found from the design values of the imaging surface 103a of the fingerprint input device 100, and the actual dimensions of the horizontal center line L1 and the vertical center line L2 were calculated. and the design value of the distance from the principal point of the fingerprint imaging camera 104 of the fingerprint input device 100 to the imaging surface 103a.
- step S206 and the calculation of the optical axis and the angle of view in step S207 are performed by the optical characteristic calculation unit 33 of the control calculation unit 25. That is, the optical characteristic calculation unit 33 calculates the optical axis and the angle of view of the fingerprint imaging camera 104 as optical characteristics based on the captured image of the fingerprint imaging camera 104 acquired by the image acquiring unit 32 in step S205.
- optical axis determination is performed depending on whether the optical axis position of the fingerprint imaging camera 104 obtained by the calculation is within the design allowable range (step S208).
- the determination section 35 of the control calculation section 25 compares the optical axis position calculated in step S207 with the design value stored in the storage section 34 . If the calculated optical axis position does not exceed the allowable range with respect to the design value, it is determined that the optical axis position is within the allowable design range. On the other hand, if the calculated optical axis position is outside the allowable range for the design value, it is determined that the optical axis position is outside the allowable design range.
- Step S216 to end the inspection.
- the angle of view of the fingerprint imaging camera 104 obtained by calculation is determined by whether it is within the design allowable range. (step S209).
- the determination unit 35 of the control calculation unit 25 compares the angle of view calculated in step S ⁇ b>207 with the design value stored in the storage unit 34 . If the calculated angle of view does not exceed the allowable range for the design value, it is determined that the angle of view is within the allowable design range. On the other hand, if the calculated angle of view exceeds the allowable range for the design value, it is determined that the angle of view is outside the allowable design range.
- the pressure table 22 is moved so that the fingerprint input device 100 can be removed from the inspection device 20 (step S216) to end the inspection.
- the fingerprint input device control section 31 of the control calculation section 25 outputs a command to the control board 106 of the fingerprint input device 100 .
- the control board 106 controls the LEDs of the white light LED board 101 to emit white light under the control of the fingerprint input device control section 31 .
- the command to the control board 106 does not necessarily have to be output by the control calculation unit 25 .
- an operator may directly operate the control board 106 of the fingerprint input device 100 .
- the natural image capturing camera 105 captures an image of the test chart 1 (step S210).
- White light which serves as a light source, enters the interior of the prism 103 from the opposing surface 103b of the prism 103, and illuminates the imaging surface 103a of the prism 103.
- the natural image capturing camera 105 When the natural image capturing camera 105 captures an image of the contact surface 1a of the test chart 1, the natural image capturing camera 105 outputs image data.
- the image acquisition unit 32 of the control calculation unit 25 acquires the image of the contact surface 1a of the test chart 1 captured by the natural image capturing camera 105 by acquiring image data output from the natural image capturing camera 105. .
- FIG. 7 is a photograph of an image captured by the natural image capture camera 105.
- dashed arrows, leader lines and symbols in FIG. 7 are added for explanation and are not included in the actual image.
- the image in FIG. 7 is an image obtained by rotating the actual image captured by the natural image capturing camera 105 clockwise by 90 degrees.
- the horizontal direction is the vertical center line L2 in FIG.
- a central region R surrounded by the frame-shaped portion 3 of the groove portion 2 is extracted from the image captured by the natural image capturing camera 105 .
- the number of pixels on the horizontal center line L1 and the number of pixels on the vertical center line L2 of the extracted central region R are measured.
- the optical axis and angle of view of the natural image capturing camera 105 are calculated (step S212).
- the optical axis position of the natural image capturing camera 105 is calculated from the difference between the intersection of the horizontal center line L1 and the vertical center line L2 obtained by image analysis and the optical axis design value of the fingerprint input device 100.
- FIG. For the angle of view of the natural image capturing camera 105, the actual dimensions corresponding to one pixel are obtained from the design values of the imaging surface 103a of the fingerprint input device 100, and the actual dimensions of the horizontal center line L1 and the vertical center line L2 are calculated. and the design value of the distance from the principal point of the natural image capturing camera 105 of the fingerprint input device 100 to the image capturing surface 103a.
- the image analysis in step S211 and the calculation of the optical axis and the angle of view in step S212 are performed by the optical characteristic calculation unit 33 of the control calculation unit 25. That is, the optical characteristic calculation unit 33 calculates the optical axis and the angle of view of the natural image capturing camera 105 as optical characteristics based on the captured image of the natural image capturing camera 105 acquired by the image acquiring unit 32 in step S210.
- optical axis determination is performed depending on whether the optical axis position of the natural image capturing camera 105 obtained by the calculation is within the design allowable range (step S213).
- the determination unit 35 of the control calculation unit 25 compares the optical axis position calculated in step S ⁇ b>212 with the design value stored in the storage unit 34 . If the calculated optical axis position does not exceed the allowable range with respect to the design value, it is determined that the optical axis position is within the allowable design range. On the other hand, if the calculated optical axis position is outside the allowable range for the design value, it is determined that the optical axis position is outside the allowable design range.
- the pressure table 22 is moved so that the fingerprint input device 100 can be removed from the inspection device 20. It is moved (step S216) to end the inspection.
- the angle of view of the natural image capturing camera 105 obtained by calculation is within the design allowable range.
- Angle determination is performed (step S214).
- the determination unit 35 of the control calculation unit 25 compares the angle of view calculated in step S ⁇ b>212 with the design value stored in the storage unit 34 . If the calculated angle of view does not exceed the allowable range for the design value, it is determined that the angle of view is within the allowable design range. On the other hand, if the calculated angle of view exceeds the allowable range for the design value, it is determined that the angle of view is outside the allowable design range.
- Step S216 to end the inspection.
- the pressing table 22 is moved so that the fingerprint input device 100 can be removed from the inspection device 20 (step S215), and the fingerprint is captured. It is determined that the camera 104 and the natural image capturing camera 105 have no manufacturing defects related to the optical characteristics of the optical axis and angle of view, and the inspection is terminated.
- the inspection device 20 of the present embodiment includes an image acquisition section 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1.
- the inspection device 20 also includes an optical characteristic calculator 33 that calculates the optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquirer 32 .
- the inspection device 20 includes a determination unit 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristics calculation unit 33 .
- the inspection apparatus 20 enables stable optical inspection.
- the optical characteristic calculator 33 calculates the horizontal center line L1 along the contact surface 1a and the horizontal center line L1 along the contact surface 1a with reference to the position of the groove portion 2 included in the image.
- a vertical centerline L2 that is orthogonal to L1 is set.
- the optical characteristic calculator 33 calculates the optical axis position of the fingerprint input device 100 (fingerprint imaging camera 104 and natural image imaging camera 105) based on the position of the intersection of the horizontal center line L1 and the vertical center line L2 as the optical characteristic. calculate. Therefore, according to the inspection apparatus 20 of the present embodiment, it is possible to calculate the optical axis position by simple image processing.
- the optical characteristic calculator 33 calculates the optical characteristic based on the length dimension of the horizontal center line L1 and the length dimension of the vertical center line L2. 104 and the angle of view of the natural image capturing camera 105). Therefore, according to the inspection apparatus 20 of the present embodiment, it is possible to calculate the angle of view by simple image processing.
- the inspection device 20 of the present embodiment also includes an installation table 21 for fixing the fingerprint input device 100 and a pressing portion 26 for pressing the contact surface 1a of the test chart 1 against the imaging surface 103a of the fingerprint input device 100. Therefore, according to the inspection device 20 of the present embodiment, air can be reliably discharged from between the imaging surface 103 a of the fingerprint input device 100 and the contact portion of the contact surface 1 a of the test chart 1 .
- the pressing unit 26 includes a pressure table 22 that abuts the test chart 1 from above, a weight 23 that is supported by the pressure table 22, and can move up and down the pressure table 22. and an actuator 24 that supports the Therefore, it is possible to easily move the pressure table 22 up and down using the power of the actuator 24 . Further, by adjusting the supporting force of the pressure base 22 of the actuator 24, it is possible to easily adjust the amount of pressure applied to the test chart 1 (pressing force).
- the test chart 1 is used.
- the test chart 1 has a contact surface 1a that contacts the imaging surface 103a of the fingerprint input device 100, and has a groove portion 2 that is provided on the contact surface 1a and connected to the outer edge 1a1 of the contact surface 1a.
- an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1 is acquired.
- the optical characteristics of the fingerprint input device 100 are calculated based on the acquired image, and the state of the fingerprint input device 100 is determined based on the calculated optical characteristics.
- the air between the contact surface 1a and the imaging surface 103a flows through the grooves 2 and is discharged to the outside. Therefore, according to the inspection method of the present embodiment, stable optical inspection is possible.
- FIG. 8 is a front view of the contact surface 1aA of the test chart 1A of this embodiment.
- the groove portion 2A has, in addition to the frame-shaped portion 3 and the connecting portion 4 described above, a resolving power inspection portion 5 formed in a pattern capable of inspecting the resolving power.
- the resolving power inspection unit 5 is a part for inspecting the resolving power, which is one of the optical characteristics of the fingerprint input device 100 .
- the resolution test unit 5 is formed of a plurality of parallel line grooves with a pitch that can be separated and reproduced when the fingerprint input device 100 has performance as designed.
- the resolving power inspection unit 5 is arranged in the central region R surrounded by the frame-shaped portion 3 .
- the resolving power inspection unit 5 may be arranged outside the central region R surrounded by the frame-shaped portion 3 .
- the line grooves forming the resolution test portion 5 are linear grooves each having a width smaller than that of the frame-shaped portion 3 and the connection portion 4 . One end of each of these line grooves is connected to the frame-shaped portion 3, as shown in FIG. Since each of the line grooves forming the resolution test portion 5 is connected to the frame-shaped portion 3 in this manner, each of the line grooves, like the frame-shaped portion 3 and the connection portion 4, allows air to pass through the contact surface 1aA to the outside of the contact surface 1aA. It becomes possible to use it as a flow path to discharge to.
- one resolution inspection unit 5 is provided.
- a plurality of resolution inspection units 5 may be provided. In such a case, by changing the pitch of the line grooves forming each resolving power test portion 5, it is possible to classify the resolving power of the fingerprint input device 100 into different levels for determination.
- the groove 2A has the resolving power inspection part 5 formed in a pattern capable of inspecting the resolving power.
- the resolution of the fingerprint input device 100 can be determined. For example, when the shape of the resolving power inspection unit 5 included in the image captured by the fingerprint input device 100 is a shape that can reproduce each line groove, the resolving power of the fingerprint input device 100 satisfies the design value and is normal. It is possible to determine that there is
- FIG. 9 is a schematic configuration diagram of the inspection system 10A of this embodiment. As shown in this figure, an inspection system 10A of this embodiment includes the test chart 1A of the second embodiment and an inspection device 20A.
- the optical characteristic calculator 33 in the control calculator 25A of the inspection device 20A calculates the resolving power of the fingerprint input device 100, which is one of the optical characteristics, in addition to the optical axis and angle of view described above.
- the optical characteristic calculating section 33 first extracts the resolving power inspecting section 5 included in the image. Subsequently, the optical characteristic calculator 33 quantifies the reproducibility and roughness of the shape of the resolving power inspection part 5 extracted from the image, for example, and calculates the resolving power.
- the optical characteristic calculator 33 when calculating the resolving power of the fingerprint imaging camera 104 , the optical characteristic calculator 33 first extracts the resolving power inspection part 5 included in the image captured by the fingerprint imaging camera 104 . Subsequently, the optical characteristic calculator 33 quantifies the reproducibility and roughness of the shape of the resolving power inspection part 5 extracted from the image captured by the fingerprint imaging camera 104 and calculates the resolving power.
- the optical characteristic calculating section 33 When calculating the resolving power of the natural image capturing camera 105, the optical characteristic calculating section 33 first extracts the resolving power inspection section 5 included in the image captured by the natural image capturing camera 105. Subsequently, the optical characteristic calculation unit 33 quantifies the reproducibility and roughness of the shape of the resolving power inspection unit 5 extracted from the image captured by the natural image capturing camera 105 and calculates the resolving power.
- the storage unit 34 stores the design value of the optical axis position of the fingerprint imaging camera 104, the design value of the angle of view of the fingerprint imaging camera 104, the design value of the angle of view of the fingerprint imaging camera 104, and the natural image as determination reference values for determining whether the optical characteristics are normal or abnormal in the determination unit 35.
- the design value of the optical axis position of the imaging camera 105 and the design value of the angle of view of the natural image imaging camera 105 the design value of the resolution of the fingerprint imaging camera 104 and the design value of the resolution of the natural image imaging camera 105 are stored. is doing.
- the determination unit 35 determines whether the optical axis and the angle of view are normal or abnormal, and also determines whether the resolving power is normal or abnormal. Specifically, the determination unit 35 determines whether the resolution of the fingerprint imaging camera 104 is normal or abnormal. The determination unit 35 also determines whether the resolving power of the natural image capturing camera 105 is normal or abnormal.
- FIG. 10 is a flowchart showing a method for inspecting the optical characteristics of the fingerprint input device 100 using the test chart 1A and the inspection device 20A.
- the optical characteristic calculation unit 33 extracts the resolution inspection unit 5 in addition to the central region R from the image captured by the fingerprint imaging camera 104. Then, in step S207, the optical characteristic calculator 33 calculates the resolving power in addition to calculating the optical axis and the angle of view.
- the angle of view obtained in step S207 is calculated.
- the resolving power of the fingerprint imaging camera 104 thus obtained is determined based on whether or not it is within the design allowable range (step S220).
- the determination unit 35 of the control calculation unit 25A compares the resolution calculated in step S207 with the design value stored in the storage unit 34. FIG. If the calculated resolving power does not exceed the design tolerance, it is determined that the resolving power is within the design tolerance.
- the calculated resolving power exceeds the allowable range for the design value, it is determined that the resolving power is outside the design allowable range. If the calculated resolution of the fingerprint imaging camera 104 is out of the allowable design range, it is determined as defective (abnormal), and the pressure table 22 is moved so that the fingerprint input device 100 can be removed from the inspection device 20A (step S216) to end the inspection. If the calculated resolution of the fingerprint imaging camera 104 is within the allowable design range, then the natural image imaging camera 105 is optically inspected.
- the optical characteristic calculation unit 33 extracts the resolving power inspection unit 5 in addition to the central region R from the image captured by the natural image capturing camera 105. Then, in step S212, the optical characteristic calculator 33 calculates the resolving power in addition to calculating the optical axis and the angle of view.
- step S212 when the angle of view of the natural image capturing camera 105 is within the allowable design range in step S214, before moving the pressure table 22 (step S215), the calculation in step S212 is performed.
- the resolving power of the natural image capturing camera 105 obtained by the above is within the design allowable range, and the resolving power is determined (step S221).
- the determination unit 35 of the control calculation unit 25A compares the resolution calculated in step S212 with the design value stored in the storage unit 34. FIG. If the calculated resolving power does not exceed the design tolerance, it is determined that the resolving power is within the design tolerance.
- the pressure table 22 is moved (step S216) to end the inspection.
- the inspection device 20A of this embodiment inspects the optical characteristics of the fingerprint input device 100 using the test chart 1A.
- the test chart 1A has a resolving power test portion 5 in which the grooves 2 are formed in a pattern that enables resolving power to be tested.
- the optical characteristic calculation section 33 calculates the resolving power of the fingerprint input device 100 based on the shape of the resolving power inspection section 5 included in the image. Therefore, according to the inspection device 20A of the present embodiment, it is possible to determine that the resolving power of the fingerprint input device 100 satisfies the design value and is normal.
- FIG. 11 is a front view of the contact surface 1aB of the test chart 1B of this embodiment.
- a groove portion 2B is provided on the contact surface 1aB of the test chart 1B.
- the contact surface 1aB is a surface that comes into contact with the imaging surface 103a of the fingerprint input device 100.
- FIG. The groove portion 2B is provided on the contact surface 103a and connected to the outer edge 1a1B of the contact surface 1aB.
- test chart 1B of this embodiment when the contact surface 1aB is pressed against the imaging surface 103a of the fingerprint input device 100, the air between the contact surface 1aB and the imaging surface 103a causes the grooves 2B to move. flow, and is discharged to the outside of the test chart 1B. Therefore, the use of the test chart 1B of this embodiment enables stable optical inspection.
- the test chart of this embodiment has a contact surface 1a that contacts the imaging surface 103a of the fingerprint input device 100 described above. Further, the test chart of the present embodiment has a groove portion 2 provided on the contact surface 1a and connected to the outer edge 1a1 of the contact surface 1a, like the test chart 1 of the first embodiment. Therefore, according to the test chart of the present embodiment, when the contact surface 1a is pressed against the imaging surface 103a of the fingerprint input device 100, the air between the contact surface 1a and the imaging surface 103a flows through the groove 2. , is discharged outside the test chart. Therefore, the use of the test chart of this embodiment enables stable optical inspection.
- test chart of this embodiment includes grooves 2 in the same manner as the test chart 1 of the first embodiment.
- the groove portion 2 has a frame-shaped portion 3 provided in an annular shape, and a connecting portion 4 that connects the frame-shaped portion 3 and the outer edge 1a1 of the contact surface 1a. For this reason, air between the contact surface 1a and the imaging surface 103a can be discharged, and the shape of the frame-shaped portion 3 can be used, for example, as an optical characteristic inspection pattern.
- the test chart of this embodiment has a contact surface 1a that contacts the imaging surface 103a of the fingerprint input device 100 described above. Further, the test chart of the present embodiment has a groove portion 2 provided on the contact surface 1a and connected to the outer edge 1a1 of the contact surface 1a, like the test chart 1 of the first embodiment. Therefore, according to the test chart of the present embodiment, when the contact surface 1a is pressed against the imaging surface 103a of the fingerprint input device 100, the air between the contact surface 1a and the imaging surface 103a flows through the groove 2. , is discharged outside the test chart. Therefore, the use of the test chart of this embodiment enables stable optical inspection.
- test chart of this embodiment includes grooves 2 in the same manner as the test chart 1 of the first embodiment.
- the groove portion 2 has a frame-shaped portion 3 provided in an annular shape, and a connecting portion 4 that connects the frame-shaped portion 3 and the outer edge 1a1 of the contact surface 1a. For this reason, air between the contact surface 1a and the imaging surface 103a can be discharged, and the shape of the frame-shaped portion 3 can be used, for example, as an optical characteristic inspection pattern.
- test chart of this embodiment includes a connecting portion 4, like the test chart 1 of the first embodiment.
- a plurality of connecting portions 4 are provided for the frame-shaped portion 3 . Therefore, air can be discharged from the interface between the contact surface 1 a and the imaging surface 103 a of the fingerprint input device 100 via each connecting portion 4 . Therefore, it becomes possible to discharge air more efficiently and reliably.
- the test chart of this embodiment has grooves 2A, like the test chart 1A of this embodiment.
- the groove 2A has a resolving power test portion 5 formed in a pattern that enables resolving power to be tested.
- the resolution of the fingerprint input device 100 can be determined. For example, when the shape of the resolving power inspection unit 5 included in the image captured by the fingerprint input device 100 is a shape that can reproduce each line groove, the resolving power of the fingerprint input device 100 satisfies the design value and is normal. It is possible to determine that there is
- the groove portion 2 includes the frame-shaped portion 3 provided in an annular shape and the outer edge 1a1 of the contact surface 1a between the frame-shaped portion 3 and the contact surface 1a, similarly to the test chart 1 of the first embodiment. You may have the connection part 4 which connects with.
- a plurality of connecting portions 4 may be provided with respect to the frame-shaped portion 3 as in the test chart 1 of the first embodiment.
- the test chart of this embodiment has a contact surface 1a that contacts the imaging surface 103a of the fingerprint input device 100 described above. Further, the test chart of the present embodiment has a groove portion 2 provided on the contact surface 1a and connected to the outer edge 1a1 of the contact surface 1a, like the test chart 1 of the first embodiment. Therefore, according to the test chart of the present embodiment, when the contact surface 1a is pressed against the imaging surface 103a of the fingerprint input device 100, the air between the contact surface 1a and the imaging surface 103a flows through the groove 2. , is discharged outside the test chart. Therefore, the use of the test chart of this embodiment enables stable optical inspection.
- test chart of this embodiment is formed using silicon resin whose refractive index is close to that of human skin. That is, the contact surface 1a is made of silicon resin. Therefore, the contact surface 1a can be clearly imaged.
- the groove portion 2 connects the annular frame-shaped portion 3 and the outer edge 1a1 of the contact surface 1a to the frame-shaped portion 3. You may have the part 4 and.
- connection portions 4 may be provided for the frame-shaped portion 3, as in the first embodiment.
- test chart of the present embodiment may have a resolving power inspection section 5 formed in a pattern that enables resolving power to be inspected, as in the second embodiment.
- the inspection device of the present embodiment like the inspection device 20 of the second embodiment, includes an image acquisition unit 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1. Prepare. Further, in the inspection apparatus of this embodiment, similarly to the inspection apparatus 20 of the second embodiment, the optical characteristic calculation unit 33 calculates the optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquisition unit 32. Prepare. Further, the inspection apparatus of the present embodiment, like the inspection apparatus 20 of the second embodiment, includes a determination section 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristic calculation section 33. Prepare. As described in the above embodiment, according to the test chart 1, the air between the contact surface 1a and the imaging surface 103a flows through the grooves 2 and is discharged to the outside. Therefore, the inspection apparatus of this embodiment enables stable optical inspection.
- test charts of other embodiments such as the second embodiment may be used.
- the inspection device of the present embodiment like the inspection device 20 of the second embodiment, includes an image acquisition unit 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1. Prepare. Further, in the inspection apparatus of this embodiment, similarly to the inspection apparatus 20 of the second embodiment, the optical characteristic calculation unit 33 calculates the optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquisition unit 32. Prepare. Further, the inspection apparatus of the present embodiment, like the inspection apparatus 20 of the second embodiment, includes a determination section 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristic calculation section 33. Prepare. As described in the above embodiment, according to the test chart 1, the air between the contact surface 1a and the imaging surface 103a flows through the grooves 2 and is discharged to the outside. Therefore, the inspection apparatus of this embodiment enables stable optical inspection.
- the optical characteristic calculator 33 calculates the horizontal center along the contact surface 1a with the position of the groove 2 included in the image as a reference.
- a line L1 and a vertical center line L2 along the contact surface 1a and orthogonal to the horizontal center line L1 are set.
- the optical characteristic calculator 33 calculates the optical axis position of the fingerprint input device 100 (fingerprint imaging camera 104 and natural image imaging camera 105) based on the position of the intersection of the horizontal center line L1 and the vertical center line L2 as the optical characteristic. calculate. Therefore, according to the inspection apparatus of the present embodiment, it is possible to calculate the optical axis position by simple image processing.
- test charts of other embodiments such as the second embodiment may be used.
- the inspection device of the present embodiment like the inspection device 20 of the second embodiment, includes an image acquisition unit 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1. Prepare. Further, in the inspection apparatus of this embodiment, similarly to the inspection apparatus 20 of the second embodiment, the optical characteristic calculation unit 33 calculates the optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquisition unit 32. Prepare. Further, the inspection apparatus of the present embodiment, like the inspection apparatus 20 of the second embodiment, includes a determination section 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristic calculation section 33. Prepare. As described in the above embodiment, according to the test chart 1, the air between the contact surface 1a and the imaging surface 103a flows through the grooves 2 and is discharged to the outside. Therefore, the inspection apparatus of this embodiment enables stable optical inspection.
- the optical characteristic calculator 33 calculates the length of the horizontal center line L1 and the length of the vertical center line L2 as optical characteristics.
- the angle of view of the fingerprint input device 100 is calculated based on the height dimension. Therefore, according to the inspection apparatus 20 of the present embodiment, it is possible to calculate the angle of view by simple image processing.
- the optical characteristic calculator 33 calculates the horizontal position along the contact surface 1a with the position of the groove portion 2 included in the image as a reference.
- a center line L1 and a vertical center line L2 along the contact surface 1a and orthogonal to the horizontal center line L1 may be set.
- the optical characteristic calculator 33 calculates the optical axis position of the fingerprint input device 100 (fingerprint imaging camera 104 and natural image imaging camera 105) based on the position of the intersection of the horizontal center line L1 and the vertical center line L2 as the optical characteristic. You can calculate.
- test charts of other embodiments such as the second embodiment may be used.
- the inspection device of the present embodiment like the inspection device 20A of the fourth embodiment, includes an image acquisition unit 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1A. Prepare. Further, in the inspection apparatus of this embodiment, similarly to the inspection apparatus 20A of the fourth embodiment, the optical characteristic calculation section 33 calculates the optical characteristic of the fingerprint input device 100 based on the image acquired by the image acquisition section 32. Prepare. Further, the inspection apparatus of this embodiment, like the inspection apparatus 20A of the fourth embodiment, includes a determination unit 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristics calculation unit 33. Prepare. As described in the above embodiment, according to the test chart 1A, the air between the contact surface 1aA and the imaging surface 103a flows through the groove 2A and is discharged to the outside. Therefore, the inspection apparatus of this embodiment enables stable optical inspection.
- the inspection device of the present embodiment inspects the optical characteristics of the fingerprint input device 100 using the test chart 1A.
- the test chart 1A has a resolving power test portion 5 in which the groove 2A is formed in a pattern that enables resolving power to be tested.
- the optical characteristic calculator 33 calculates the resolving power of the fingerprint input device 100 based on the shape of the resolving power inspector 5 included in the image. Therefore, according to the inspection device of the present embodiment, it is possible to determine that the resolving power of the fingerprint input device 100 satisfies the design value and is normal.
- the optical characteristic calculator 33 calculates the horizontal center line L1 along the contact surface 1aA and the horizontal center line L1 along the contact surface 1aA with reference to the position of the groove portion 2A included in the image.
- a perpendicular center line L2 may be set.
- the optical characteristic calculator 33 calculates the optical characteristic based on the length dimension of the horizontal center line L1 and the length dimension of the vertical center line L2.
- the angle of view of the natural image capturing camera 105) may be calculated.
- the inspection device of the present embodiment like the inspection device 20 of the second embodiment, includes an image acquisition unit 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1. Prepare. Further, in the inspection apparatus of this embodiment, similarly to the inspection apparatus 20 of the second embodiment, the optical characteristic calculation unit 33 calculates the optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquisition unit 32. Prepare. Further, the inspection apparatus of the present embodiment, like the inspection apparatus 20 of the second embodiment, includes a determination section 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristic calculation section 33. Prepare. As described in the above embodiment, according to the test chart 1, the air between the contact surface 1a and the imaging surface 103a flows through the grooves 2 and is discharged to the outside. Therefore, the inspection apparatus of this embodiment enables stable optical inspection.
- the inspection device of this embodiment has a mounting base 21 for fixing the fingerprint input device 100 and a contact surface of the test chart 1 on the imaging surface 103a of the fingerprint input device 100, similarly to the inspection device 20 of the second embodiment. and a pressing portion 26 for pressing 1a. Therefore, according to the inspection device of the present embodiment, air can be reliably discharged from between the imaging surface 103 a of the fingerprint input device 100 and the contact portion of the contact surface 1 a of the test chart 1 .
- the optical characteristic calculator 33 calculates the horizontal center line L1 along the contact surface 1a and the horizontal center line L1 along the contact surface 1a with reference to the position of the groove portion 2 included in the image.
- An orthogonal vertical center line L2 may be set.
- the optical characteristic calculator 33 calculates the optical characteristic based on the length dimension of the horizontal center line L1 and the length dimension of the vertical center line L2.
- the angle of view of the natural image capturing camera 105) may be calculated.
- test charts of other embodiments such as the second embodiment may be used.
- the inspection device of the present embodiment like the inspection device 20 of the second embodiment, includes an image acquisition unit 32 that acquires an image of the contact surface 1a captured by the fingerprint input device 100 using the test chart 1. Prepare. Further, in the inspection apparatus of this embodiment, similarly to the inspection apparatus 20 of the second embodiment, the optical characteristic calculation unit 33 calculates the optical characteristics of the fingerprint input device 100 based on the image acquired by the image acquisition unit 32. Prepare. Further, the inspection apparatus of the present embodiment, like the inspection apparatus 20 of the second embodiment, includes a determination section 35 that determines the state of the fingerprint input device 100 based on the optical characteristics calculated by the optical characteristic calculation section 33. Prepare. As described in the above embodiment, according to the test chart 1, the air between the contact surface 1a and the imaging surface 103a flows through the grooves 2 and is discharged to the outside. Therefore, the inspection apparatus of this embodiment enables stable optical inspection.
- the inspection device of this embodiment has a mounting base 21 for fixing the fingerprint input device 100 and a contact surface of the test chart 1 on the imaging surface 103a of the fingerprint input device 100, similarly to the inspection device 20 of the second embodiment. and a pressing portion 26 for pressing 1a. Therefore, according to the inspection device of the present embodiment, air can be reliably discharged from between the imaging surface 103 a of the fingerprint input device 100 and the contact portion of the contact surface 1 a of the test chart 1 .
- the pressing portion 26 includes a pressure table 22 that contacts the test chart 1 from above, a weight 23 that is supported by the pressure table 22, and an actuator that supports the pressure table 22 so that it can move up and down. 24. Therefore, it is possible to easily move the pressure table 22 up and down using the power of the actuator 24 . Further, by adjusting the supporting force of the pressure base 22 of the actuator 24, it is possible to easily adjust the amount of pressure applied to the test chart 1 (pressing force).
- test charts of other embodiments such as the second embodiment may be used.
- An inspection jig comprising: a contact surface that contacts an imaging surface of a skin pattern input device; and a groove provided on the contact surface and connected to an outer edge of the contact surface.
- Appendix 2 The inspection jig according to appendix 1, wherein the groove portion has an annular portion and a connection portion that connects the annular portion and the outer edge of the contact surface.
- Appendix 4 The inspection jig according to any one of Appendices 1 to 3, wherein the groove portion has a resolution test portion formed in a pattern capable of inspecting the resolution.
- Appendix 5 The inspection jig according to any one of Appendices 1 to 4, wherein at least the contact surface is formed using silicone resin.
- An inspection device comprising:
- the optical characteristic calculation means uses the position of the groove portion included in the image as a reference, a first reference line along the contact surface, and a first reference line along the contact surface and perpendicular to the first reference line. defining a second reference line, and calculating the optical axis position of the skin pattern input device based on the intersection position of the first reference line and the second reference line as at least one of the optical characteristics.
- the optical characteristic calculation means uses the position of the groove portion included in the image as a reference, a first reference line along the contact surface, and a first reference line along the contact surface and perpendicular to the first reference line. and a second reference line, and as at least one of the optical characteristics, the angle of view of the skin pattern input device is determined based on the length dimension of the first reference line and the length dimension of the second reference line. 8. The inspection device according to appendix 6 or 7, wherein the calculation is performed.
- the groove portion of the inspection jig has a resolution inspection portion formed in a pattern capable of inspecting resolution, and the optical characteristic calculation means is based on the shape of the resolution inspection portion included in the image.
- the inspection apparatus according to any one of Appendices 6 to 8, wherein the resolving power of the skin pattern input device is calculated as at least one of the optical characteristics.
- Appendix 10 Appendices 6 to 9, characterized by comprising fixing means for fixing the skin pattern input device, and pressing means for pressing the contact surface of the inspection jig against the imaging surface of the skin pattern input device.
- An inspection device according to any one of the preceding paragraphs.
- the pressing means includes a pressing table that abuts against the inspection jig from above, a weight supported by the pressing table, and an actuator that supports the pressing table so that it can move up and down.
- the inspection apparatus according to appendix 10, characterized in that:
- the inspection jig has a contact surface that comes into contact with the imaging surface of the skin pattern input device, has a groove portion that is provided on the contact surface and is connected to the outer edge of the contact surface, and acquires an image of the contact surface captured by the skin pattern input device using a tool, calculates the optical characteristics of the skin pattern input device based on the image, and calculates the optical characteristics of the skin pattern input device based on the optical characteristics.
- An inspection method characterized by determining a state.
- stable optical inspection can be performed on the skin pattern input device.
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Abstract
Description
図1は、この開示の第1実施形態におけるテストチャート1(検査治具)の斜視図である。テストチャート1は、検査対象である後述する指紋入力装置100(皮膚紋様入力装置)の撮像面103aに接触される接触面1aと、接触面1aの外縁1a1に沿って設けられた周面1bとを有するブロック形状に形成されている。本実施形態のテストチャート1は、人間の皮膚の屈折率に近い屈折率(約1.4)を持つシリコン樹脂を材料として形成されている。
次に、この開示の第2実施形態について説明する。なお、本実施形態の説明において、上記第1実施形態と同様の部分については、その説明を省略あるいは簡略化する。
次に、この開示の第3実施形態について図8を参照して説明する。なお、本実施形態の説明において、上記第1実施形態と同様の部分については、その説明を省略あるいは簡略化する。
次に、この開示の第4実施形態について図9及び図10を参照して説明する。なお、本実施形態の説明において、上記第2実施形態と同様の部分については、その説明を省略あるいは簡略化する。
次に、この開示の第5実施形態について図11を参照して説明する。なお、本実施形態の説明において、上記第1実施形態と同様の部分については、その説明を省略あるいは簡略化する。
次に、この開示の第6実施形態について説明する。本実施形態のテストチャートは、上記第1実施形態のテストチャート1と同様に、上述の指紋入力装置100の撮像面103aに接触される接触面1aを有している。また、本実施形態のテストチャートは、上記第1実施形態のテストチャート1と同様に、接触面1aに設けられると共に接触面1aの外縁1a1に接続された溝部2を有する。このため、本実施形態のテストチャートによれば、接触面1aを指紋入力装置100の撮像面103aに対して押圧した場合に、接触面1aと撮像面103aとの間の空気が溝部2を流れ、テストチャートの外部に排出される。したがって、本実施形態のテストチャートを用いることで、安定した光学検査が可能となる。
次に、この開示の第7実施形態について説明する。本実施形態のテストチャートは、上記第1実施形態のテストチャート1と同様に、上述の指紋入力装置100の撮像面103aに接触される接触面1aを有している。また、本実施形態のテストチャートは、上記第1実施形態のテストチャート1と同様に、接触面1aに設けられると共に接触面1aの外縁1a1に接続された溝部2を有する。このため、本実施形態のテストチャートによれば、接触面1aを指紋入力装置100の撮像面103aに対して押圧した場合に、接触面1aと撮像面103aとの間の空気が溝部2を流れ、テストチャートの外部に排出される。したがって、本実施形態のテストチャートを用いることで、安定した光学検査が可能となる。
次に、この開示の第8実施形態について説明する。本実施形態のテストチャートは、本実施形態のテストチャート1Aと同様に、溝部2Aを有している。溝部2Aは、解像力を検査可能なパターンに形成された解像力検査部5を有している。このようなテストチャートを用いて上述の指紋入力装置100の光学特性を検査することで、指紋入力装置100の解像力を判定することが可能となる。例えば、指紋入力装置100で撮像した画像に含まれる解像力検査部5の形状が、各々の線溝を再現可能な形状である場合には、指紋入力装置100の解像力は設計値を満たして正常であると判断することが可能である。
次に、この開示の第9実施形態について説明する。本実施形態のテストチャートは、上記第1実施形態のテストチャート1と同様に、上述の指紋入力装置100の撮像面103aに接触される接触面1aを有している。また、本実施形態のテストチャートは、上記第1実施形態のテストチャート1と同様に、接触面1aに設けられると共に接触面1aの外縁1a1に接続された溝部2を有する。このため、本実施形態のテストチャートによれば、接触面1aを指紋入力装置100の撮像面103aに対して押圧した場合に、接触面1aと撮像面103aとの間の空気が溝部2を流れ、テストチャートの外部に排出される。したがって、本実施形態のテストチャートを用いることで、安定した光学検査が可能となる。
次に、この開示の第10実施形態について説明する。本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、テストチャート1を用いて上述の指紋入力装置100で撮像された接触面1aの画像を取得する画像取得部32を備える。また、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、画像取得部32で取得された画像に基づいて指紋入力装置100の光学特性を算出する光学特性算出部33を備える。さらに、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、光学特性算出部33で算出された光学特性に基づいて指紋入力装置100の状態を判定する判定部35を備える。上記実施形態で説明したように、テストチャート1によれば、接触面1aと撮像面103aとの間の空気が溝部2を流れて外部に排出される。このため、本実施形態の検査装置によれば、安定した光学検査が可能となる。
次に、この開示の第11実施形態について説明する。本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、テストチャート1を用いて上述の指紋入力装置100で撮像された接触面1aの画像を取得する画像取得部32を備える。また、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、画像取得部32で取得された画像に基づいて指紋入力装置100の光学特性を算出する光学特性算出部33を備える。さらに、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、光学特性算出部33で算出された光学特性に基づいて指紋入力装置100の状態を判定する判定部35を備える。上記実施形態で説明したように、テストチャート1によれば、接触面1aと撮像面103aとの間の空気が溝部2を流れて外部に排出される。このため、本実施形態の検査装置によれば、安定した光学検査が可能となる。
次に、この開示の第12実施形態について説明する。本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、テストチャート1を用いて上述の指紋入力装置100で撮像された接触面1aの画像を取得する画像取得部32を備える。また、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、画像取得部32で取得された画像に基づいて指紋入力装置100の光学特性を算出する光学特性算出部33を備える。さらに、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、光学特性算出部33で算出された光学特性に基づいて指紋入力装置100の状態を判定する判定部35を備える。上記実施形態で説明したように、テストチャート1によれば、接触面1aと撮像面103aとの間の空気が溝部2を流れて外部に排出される。このため、本実施形態の検査装置によれば、安定した光学検査が可能となる。
次に、この開示の第13実施形態について説明する。本実施形態の検査装置は、上記第4実施形態の検査装置20Aと同様に、テストチャート1Aを用いて上述の指紋入力装置100で撮像された接触面1aの画像を取得する画像取得部32を備える。また、本実施形態の検査装置は、上記第4実施形態の検査装置20Aと同様に、画像取得部32で取得された画像に基づいて指紋入力装置100の光学特性を算出する光学特性算出部33を備える。さらに、本実施形態の検査装置は、上記第4実施形態の検査装置20Aと同様に、光学特性算出部33で算出された光学特性に基づいて指紋入力装置100の状態を判定する判定部35を備える。上記実施形態で説明したように、テストチャート1Aによれば、接触面1aAと撮像面103aとの間の空気が溝部2Aを流れて外部に排出される。このため、本実施形態の検査装置によれば、安定した光学検査が可能となる。
次に、この開示の第14実施形態について説明する。本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、テストチャート1を用いて上述の指紋入力装置100で撮像された接触面1aの画像を取得する画像取得部32を備える。また、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、画像取得部32で取得された画像に基づいて指紋入力装置100の光学特性を算出する光学特性算出部33を備える。さらに、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、光学特性算出部33で算出された光学特性に基づいて指紋入力装置100の状態を判定する判定部35を備える。上記実施形態で説明したように、テストチャート1によれば、接触面1aと撮像面103aとの間の空気が溝部2を流れて外部に排出される。このため、本実施形態の検査装置によれば、安定した光学検査が可能となる。
次に、この開示の第15実施形態について説明する。本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、テストチャート1を用いて上述の指紋入力装置100で撮像された接触面1aの画像を取得する画像取得部32を備える。また、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、画像取得部32で取得された画像に基づいて指紋入力装置100の光学特性を算出する光学特性算出部33を備える。さらに、本実施形態の検査装置は、上記第2実施形態の検査装置20と同様に、光学特性算出部33で算出された光学特性に基づいて指紋入力装置100の状態を判定する判定部35を備える。上記実施形態で説明したように、テストチャート1によれば、接触面1aと撮像面103aとの間の空気が溝部2を流れて外部に排出される。このため、本実施形態の検査装置によれば、安定した光学検査が可能となる。
1a 接触面
1A テストチャート(検査治具)
1a1 外縁
1a1B 外縁
1aA 接触面
1aB 接触面
1b 周面
1B テストチャート(検査治具)
2 溝部
2A 溝部
2B 溝部
3 枠状部(環状部)
3a 第1長辺部
3b 第2長辺部
3c 第1短辺部
3d 第2短辺部
4 接続部
5 解像力検査部
10 検査システム
10A 検査システム
20 検査装置
20A 検査装置
21 設置台(固定手段)
22 加圧台
23 重り
24 アクチュエータ
25 制御演算部
25A 制御演算部
26 押圧部(押圧手段)
30 アクチュエータ制御部
31 指紋入力装置制御部
32 画像取得部(画像取得手段)
33 光学特性算出部(光学特性算出手段)
34 記憶部
35 判定部(判定手段)
100 指紋入力装置(皮膚紋様入力装置)
101 白色光LED基板
102 近赤外光LED基板
103 プリズム
103a 撮像面
103b 対向面
103c 交わり面
103d 面
104 指紋撮像カメラ
105 自然画像撮像カメラ
106 制御基板
107 ライトガイド
L1 水平中心線(第1基準線)
L2 垂直中心線(第2基準線)
R 中央領域
Claims (12)
- 皮膚紋様入力装置の撮像面に接触される接触面を有し、
前記接触面に設けられると共に前記接触面の外縁に接続された溝部を有する
ことを特徴とする検査治具。 - 前記溝部は、
環状に設けられた環状部と、
前記環状部と前記接触面の外縁とを接続する接続部と
を有することを特徴とする請求項1記載の検査治具。 - 前記接続部は、前記環状部に対して複数設けられていることを特徴とする請求項2記載の検査治具。
- 前記溝部は、解像力を検査可能なパターンに形成された解像力検査部を有することを特徴とする請求項1~3いずれか一項に記載の検査治具。
- 少なくとも前記接触面は、シリコン樹脂を用いて形成されていることを特徴とする請求項1~4いずれか一項に記載の検査治具。
- 請求項1~5いずれか一項に記載の検査治具を用いて皮膚紋様入力装置で撮像された前記接触面の画像を取得する画像取得手段と、
前記画像取得手段で取得された前記画像に基づいて前記皮膚紋様入力装置の光学特性を算出する光学特性算出手段と、
前記光学特性算出手段で算出された前記光学特性に基づいて前記皮膚紋様入力装置の状態を判定する判定手段と
を備えることを特徴とする検査装置。 - 前記光学特性算出手段は、
前記画像に含まれる前記溝部の位置を基準として、前記接触面に沿った第1基準線と、前記接触面に沿うと共に前記第1基準線と直交する第2基準線とを規定し、
前記光学特性の少なくとも1つとして、前記第1基準線と前記第2基準線との交点位置に基づいて前記皮膚紋様入力装置の光軸位置を算出する
ことを特徴とする請求項6記載の検査装置。 - 前記光学特性算出手段は、
前記画像に含まれる前記溝部の位置を基準として、前記接触面に沿った第1基準線と、前記接触面に沿うと共に前記第1基準線と直交する第2基準線とを規定し、
前記光学特性の少なくとも1つとして、前記第1基準線の長さ寸法と前記第2基準線の長さ寸法とに基づいて前記皮膚紋様入力装置の画角を算出する
ことを特徴とする請求項6または7記載の検査装置。 - 前記検査治具の前記溝部が、解像力を検査可能なパターンに形成された解像力検査部を有し、
前記光学特性算出手段は、前記画像に含まれる前記解像力検査部の形状に基づいて、前記光学特性の少なくとも1つとして前記皮膚紋様入力装置の解像力を算出する
ことを特徴とする請求項6~8いずれか一項に記載の検査装置。 - 前記皮膚紋様入力装置を固定する固定手段と、
前記皮膚紋様入力装置の前記撮像面に前記検査治具の接触面を押圧する押圧手段と
を備えることを特徴とする請求項6~9いずれか一項に記載の検査装置。 - 前記押圧手段は、
前記検査治具に上方から当接される加圧台と、
前記加圧台により支持される重りと、
前記加圧台を昇降可能に支持するアクチュエータと
を備えることを特徴とする請求項10記載の検査装置。 - 検査治具が、皮膚紋様入力装置の撮像面に接触される接触面を有し、前記接触面に設けられると共に前記接触面の外縁に接続された溝部を有し、
前記検査治具を用いて皮膚紋様入力装置で撮像された前記接触面の画像を取得し、
前記画像に基づいて前記皮膚紋様入力装置の光学特性を算出し、
前記光学特性に基づいて前記皮膚紋様入力装置の状態を判定する
ことを特徴とする検査方法。
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JP2005292090A (ja) * | 2004-04-05 | 2005-10-20 | Sony Corp | 検査装置、検査治具および検査方法 |
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JP2003060186A (ja) * | 2001-05-10 | 2003-02-28 | Canon Inc | 画像入力装置及びその製造方法並びに画像入力装置を用いた放射線撮像システム |
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