US20190183390A1 - Fingerprint reading device - Google Patents

Fingerprint reading device Download PDF

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Publication number
US20190183390A1
US20190183390A1 US16/322,194 US201816322194A US2019183390A1 US 20190183390 A1 US20190183390 A1 US 20190183390A1 US 201816322194 A US201816322194 A US 201816322194A US 2019183390 A1 US2019183390 A1 US 2019183390A1
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United States
Prior art keywords
sensor
fingerprint
finger
reading device
example embodiment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US16/322,194
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English (en)
Inventor
Yoshinori Koda
Teruyuki Higuchi
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NEC Corp
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NEC Corp
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Assigned to NEC CORPORATION reassignment NEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIGUCHI, TERUYUKI, KODA, YOSHINORI
Publication of US20190183390A1 publication Critical patent/US20190183390A1/en
Abandoned legal-status Critical Current

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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
    • G06K9/00013—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0007—Image acquisition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/20—Processor architectures; Processor configuration, e.g. pipelining
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/60—Static or dynamic means for assisting the user to position a body part for biometric acquisition
    • G06V40/63—Static or dynamic means for assisting the user to position a body part for biometric acquisition by static guides
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger

Definitions

  • the present invention relates to a fingerprint reading device.
  • Fingerprints have uniqueness and permanence because fingerprints are different among individuals and do not change in their lifetime. Thus, fingerprints have been widely used in the situations where recognition of an individual is required.
  • CMOS Complementary Metal Oxide Semiconductor
  • a transmission-type fingerprint input device has been focused on (see Patent Literatures 1 to 3).
  • a transmission-type fingerprint input device a light from a light source is caused to enter a finger and is scattered therein, and a light exiting from the surface of the finger is utilized to capture an image of a fingerprint.
  • a finger from which a fingerprint is read is placed on a reading face on a reading sensor supported by the scheme, such as an image sensor, and the fingerprint is then read.
  • a relatively soft finger such as a wet finger, a finger with a high water-retention capability, a finger of a newborn or an infant may cause a position shift with respect to a sensor face when a finger is placed on the reading face in a particular manner. Since it is difficult to appropriately read a fingerprint from a finger where a position shift with respect to the reading face occurs, it is difficult to acquire a high quality fingerprint image that can be utilized for recognition of an individual or the like.
  • the present invention intends to provide a fingerprint reading device that can suppress a position shift of a finger whose fingerprint is to be read with respect to a reading face.
  • a fingerprint reading device includes: a placement portion on which a finger is placed; a reading face with which the finger placed on the placement portion contacts; a pair of light sources that are provided on the placement portion and irradiate the finger placed on the placement portion with lights; and a reading unit that captures and reads a fingerprint of the finger in contact with the reading face in accordance with lights scattered in the finger and emitted from a surface of the finger, the pair of light sources are provided on both ends of the reading face that are opposed to each other in a width direction of the placement portion and have light guiding parts formed in a front-back direction of the placement portion, respectively, and the light guiding parts are formed so as to extend up to above the ends of the reading face.
  • FIG. 1 is a schematic diagram illustrating a fingerprint reading system according to a first example embodiment of the present invention.
  • FIG. 2 is a plan view illustrating a fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 3 is a longitudinal sectional view illustrating the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 4 is a transverse sectional view illustrating the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 5A is a schematic diagram illustrating an example of a sensor drive unit in the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 5B is a schematic diagram illustrating an example of the sensor drive unit in the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 6 is a schematic diagram illustrating a view in which a fingerprint of a finger of a subject is read by using the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 7 is a block diagram illustrating the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 8 is a block diagram illustrating an image processing apparatus according to the first example embodiment of the present invention.
  • FIG. 9A is a schematic diagram illustrating the operation of the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 9B is a schematic diagram illustrating the operation of the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 9C is a schematic diagram illustrating the operation of the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 10A is a schematic diagram illustrating the principle by which deformation of a fingerprint is reduced when the fingerprint is read by using the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 10B is a schematic diagram illustrating the principle by which deformation of a fingerprint is reduced when the fingerprint is read by using the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 10C is a schematic diagram illustrating the principle by which deformation of a fingerprint is reduced when the fingerprint is read by using the fingerprint reading device according to the first example embodiment of the present invention.
  • FIG. 11 is a plan view illustrating a fingerprint reading device according to a second example embodiment of the present invention.
  • FIG. 12 is a longitudinal sectional view illustrating the fingerprint reading device according to the second example embodiment of the present invention.
  • FIG. 13A is a schematic diagram illustrating the operation of the fingerprint reading device according to the second example embodiment of the present invention.
  • FIG. 13B is a schematic diagram illustrating the operation of the fingerprint reading device according to the second example embodiment of the present invention.
  • FIG. 13C is a schematic diagram illustrating the operation of the fingerprint reading device according to the second example embodiment of the present invention.
  • FIG. 14 is a plan view illustrating a fingerprint reading device according to a third example embodiment of the present invention.
  • FIG. 15 is a longitudinal sectional view illustrating the fingerprint reading device according to the third example embodiment of the present invention.
  • FIG. 16A is a schematic diagram illustrating an example of a sensor drive unit in the fingerprint reading device according to the third example embodiment of the present invention.
  • FIG. 16B is a schematic diagram illustrating an example of the sensor drive unit in the fingerprint reading device according to the third example embodiment of the present invention.
  • FIG. 17A is a schematic diagram illustrating the operation of the fingerprint reading device according to the third example embodiment of the present invention.
  • FIG. 17B is a schematic diagram illustrating the operation of the fingerprint reading device according to the third example embodiment of the present invention.
  • FIG. 17C is a schematic diagram illustrating the operation of the fingerprint reading device according to the third example embodiment of the present invention.
  • FIG. 18 is a plan view illustrating a fingerprint reading device according to a fourth example embodiment of the present invention.
  • FIG. 19 is a plan view illustrating a fingerprint reading device according to a fifth example embodiment of the present invention.
  • FIG. 20 is a transverse sectional view illustrating a fingerprint reading device according to a sixth example embodiment of the present invention.
  • FIG. 21 is a longitudinal sectional view illustrating a fingerprint reading device according to a seventh example embodiment of the present invention.
  • FIG. 22 is a flowchart illustrating the operation of a fingerprint reading device and an image processing apparatus according to an eighth example embodiment of the present invention.
  • FIG. 23 is a block diagram illustrating a function configuration of a fingerprint reading device according to another example embodiment of the present invention.
  • a fingerprint reading device and a fingerprint reading method according to a first example embodiment of the present invention will be described by using FIG. 1 to FIG. 10C .
  • FIG. 1 is a schematic diagram illustrating the general configuration of the fingerprint reading system according to the present example embodiment.
  • a fingerprint reading system 1 has a fingerprint reading device 10 that captures and reads a fingerprint of a subject and an image processing apparatus 20 that performs processes such as display, recording, or the like on a fingerprint image that is an image of a fingerprint read by the fingerprint reading device 10 .
  • the fingerprint reading device 10 has a placement portion 102 on which a finger of a subject is placed and a holding portion 104 that is held by a user when used. A sensor face 118 with which a finger placed on the placement portion 102 comes into contact is provided on the placement portion 102 .
  • the fingerprint reading device 10 is communicatively connected to the image processing apparatus 20 via the communication cable 30 . Note that the fingerprint reading device 10 may be communicatively connected to the image processing apparatus 20 by using a wireless scheme instead of a wired scheme through the communication cable 30 .
  • the fingerprint reading device 10 is targeted for a newborn, an infant, and a young child as a subject whose fingerprint is read, for example.
  • a finger of a newborn, an infant, and a young child, in particular, a finger of a newborn has a higher moisture percentage and thus is softer than a finger of an adult, and a finger of a newborn may be more easily subjected to significant elastic deformation than a finger of an adult.
  • the fingerprint reading device 10 according to the present example embodiment can appropriately read a fingerprint even in a case of a finger, such as a finger of a newborn, an infant, and a young child, which is relatively soft due to a high moisture percentage and may be easily subjected to significant elastic deformation, as described later.
  • the fingerprint reading device 10 is an optical fingerprint scanner that captures a fingerprint image by using a two-dimensional image sensor and reads a fingerprint.
  • the fingerprint reading device 10 can capture a fingerprint image of any one of respective thumbs, index fingers, middle fingers, ring fingers, and little fingers of the left hand and the right hand of a subject, namely, the ten fingers in total, for example. Further, the fingerprint reading device 10 can capture a fingerprint image of not only a finger of the hands but also any one of respective first toes, second toes, third toes, fourth toes, and fifth toes of the left foot and the right foot, namely, the ten fingers of feet (toes) in total.
  • the fingerprint reading device 10 can be used to capture fingerprints of a plurality of fingers or toes of a single subject and provide these fingerprint images of the plurality of fingers or toes for recognition of an individual.
  • fingerprints of the thumb of the left hand, the thumb of the right hand, the first toe of the left foot, and the first toe of the right foot can be sequentially captured.
  • FIG. 2 is a plan view illustrating the fingerprint reading device 10 according to the present example embodiment, which illustrates a plane viewed from a top face side out of the front face and the back face of the fingerprint reading device 10 .
  • FIG. 3 is a longitudinal sectional view illustrating the fingerprint reading device 10 according to the present example embodiment, which illustrates a vertical cross section taken along a line A-A of FIG. 2 .
  • FIG. 4 is a horizontal cross section illustrating the fingerprint reading device 10 according to the present example embodiment, which illustrates a horizontal cross section taken along a line B-B of FIG. 2 .
  • FIG. 5B are schematic diagrams illustrating an example of a sensor drive unit in the fingerprint reading device 10 according to the present example embodiment.
  • FIG. 6 is a schematic diagram illustrating a view in which a fingerprint of a finger of a subject is read by using the fingerprint reading device 10 according to the present example embodiment.
  • FIG. 7 is a block diagram illustrating the fingerprint reading device 10 according to the present example embodiment. Note that, in the first example embodiment and subsequent example embodiments, the scale of each member is not the same in each referenced drawing, and each member may be depicted with exaggeration for the purpose of illustration.
  • the fingerprint reading device 10 has a casing 106 , an image sensor 108 , a sensor cover 110 , a pair of side light sources 112 , a sensor drive unit 114 , and a control circuit 116 .
  • a casing 106 is a hollow member having an external shape of a vertically flat, thin, approximate rectangular parallelepiped, and the longitudinal direction thereof is a front-rear direction.
  • the casing 106 is made of a resin, for example.
  • the front-side part is the placement portion 102
  • the rear-side part is the holding portion 104 .
  • the front end part of the placement portion 102 has a tapered shape inclined from the backside face side to the top face side.
  • the external shape of the casing 106 is not limited to the external shape of a flat, approximate rectangular parallelepiped, but any shape may be employed.
  • the image sensor 108 is provided inside the casing 106 of the placement portion 102 .
  • the image sensor 108 is arranged such that the image capturing surface thereof faces the outside of the casing 106 .
  • a sensor cover 110 is provided on the image capturing surface of the image sensor 108 .
  • the surface of the sensor cover 110 forms the sensor face 118 that is a reading face on which a ball of a finger of a subject whose fingerprint is to be read is placed and with which the placed ball of the finger comes into contact.
  • the sensor cover 110 is formed of a plate-like member made of a material that transmits a near-infrared light, for example, formed of a protection glass. Thereby, as described later, a near-infrared light is emitted from the pair of side light sources 112 and enters the finger on the sensor cover 110 , and the near-infrared light emitted from the ball side of the finger enters the image sensor 108 after scattering inside the finger.
  • the image capturing face of the image sensor 108 has a rectangular planar shape having a larger area than the ball of a finger (toe) whose fingerprint is to be captured. At a capturing position described later, the image sensor 108 is arranged such that the longitudinal direction of the rectangular planar shape is in parallel to the front-rear direction of the casing 106 .
  • the planar shape of the image sensor 108 is not particularly limited, but various shapes may be employed.
  • a heatsink made of a metal or the like used for cooling the image sensor 108 may be provided on the backside face of the image sensor 108 .
  • the image sensor 108 functions as a reading unit that reads a fingerprint of a finger.
  • the image sensor 108 is configured to capture and read a fingerprint of a finger by receiving, on the image capturing face, a near-infrared light that has been emitted from the ball of the finger in contact with the sensor face 118 of the sensor cover 110 and has transmitted through the sensor cover 110 , as described later.
  • the image sensor 108 is a two-dimensional image sensor, for example, a CMOS image sensor. Further, as the image sensor 108 , a Charge Coupled Device (CCD) image sensor may be used other than the CMOS image sensor.
  • CCD Charge Coupled Device
  • the pixel density and the number of pixels of the image sensor 108 are not particularly limited, for example, a high density such as 1000 ppi or higher and a large number of pixels are preferable in taking into consideration of a case of capturing a fingerprint of a newborn, an infant, a young child, or the like.
  • a CMOS image sensor having a large size of a width of 20 mm and a length of 30 mm, a high pixel density of 1270 ppi, and a large number of pixels can be used as the image sensor 108 .
  • the front end part of the image sensor 108 is attached to a top plate at the front end of the placement portion 102 in the casing 106 via a hinge part 120 .
  • the hinge part 120 includes a rocking shaft extending in the width direction of the placement portion 102 in the casing 106 .
  • the front side or the front end part of the image sensor 108 refers to the end part of the fingerprint reading device 10 , that is, the end part, which is located opposite to the holding portion 104 , of the placement portion 102 .
  • the rear side or the rear end part of the image sensor 108 refers to the center part of the fingerprint reading device 10 , that is, the end part, which is located on the holding portion 104 side, of the placement portion 102 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are provided so as to be able to swing about a rocking shaft of the hinge part 120 located at the front side end of the placement portion 102 as a fulcrum. This enables the image sensor 108 and the sensor cover 110 including the sensor face 118 to move between a capturing position, which is a first position, and a recessed position, which is a second position located inside the casing 106 deeper than the capturing position.
  • the image sensor 108 and the sensor cover 110 are arranged such that the sensor face 118 of the sensor cover 110 is orthogonal to the perpendicular direction of the placement portion 102 . Further, the image sensor 108 and the sensor cover 110 positioned at the capturing position seal the inside of the placement portion 102 . On the other hand, at the recessed position, the image sensor 108 and the sensor cover 110 are arranged such that the sensor face 118 of the sensor cover 110 is inclined to face the rearward oblique upper direction relative to the placement portion 102 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are driven by the sensor drive unit 114 and move between the capturing position and the recessed position. At the capturing position, the sensor face 118 contacts with the ball of the finger placed on the placement portion 102 . In contrast, at the recessed position, the sensor face 118 separates from the ball of the finger placed on the placement portion 102 .
  • the image sensor 108 and the sensor cover 110 at the capturing position are illustrated by the solid line, and the image sensor 108 and the sensor cover 110 at the recessed position are illustrated by the one-dot-chain line.
  • the sensor face 118 of the sensor cover 110 at the capturing position is orthogonal to the perpendicular direction of the placement portion 102 and forms a flat face with the surface of the holding portion 104 with substantially no step.
  • the sensor face 118 of the sensor cover 110 at the recessed position is inclined so as to enter the inside of the casing 106 in the direction from the front side to the rear side of the placement portion 102 .
  • the pair of side light sources 112 are provided above regions on both sides of the sensor face 118 in the placement portion 102 of the casing 106 .
  • Each of the pair of the side light sources 112 forms a line light source provided so as to extend in the front-rear direction of the placement portion 102 that is the longitudinal direction of the casing 106 .
  • the pair of side light sources 112 are provided on both end portions of the sensor face 118 , which are opposed to each other in the width direction of the placement portion 102 , and face each other in the width direction of the placement portion 102 via the sensor face 118 .
  • Each of the pair of side light sources 112 is a light source that irradiates a finger placed on the sensor face 118 of the placement portion 102 with near-infrared light.
  • Each side light source 112 has a plurality of near-infrared LEDs 122 and light guiding parts 124 formed to cover the plurality of near-infrared LEDs 122 .
  • the plurality of near-infrared LEDs 122 are arranged so as to be aligned in a line in the front-rear direction of the placement portion 102 .
  • the plurality of near-infrared LEDs 122 arranged in each line are covered with the light guiding part 124 provided in the front-rear direction of the placement portion 102 .
  • Each of the plurality of near-infrared LEDs 122 forms a unit light source forming a line light source, respectively, and emits near-infrared light of a wavelength of 820 to 980 nm, for example.
  • Each near-infrared LED 122 is provided at the same height as the sensor face 118 in the capturing position or a height higher than the sensor face 118 at the capturing position in the perpendicular direction of the casing 106 . Further, each near-infrared LED 122 is arranged inclined such that the light axis thereof is oriented to the center upper space of the sensor face 118 at the capturing position. Each near-infrared LED 122 is arranged inclined such that the angle of the light axis relative to the sensor face 118 is greater than 0 degree and less than 90 degrees, for example.
  • each of the side light sources 112 which is a line light source, is configured such that the light axis thereof is inclined inward above the sensor face 118 positioned at the capturing position and oriented to the center upper space of the sensor face 118 .
  • Each side light source 112 is arranged such that the angle of the light axis relative to the sensor face 118 is greater than 0 degree and less than 90 degrees, for example.
  • each of the side light sources 112 is able to irradiate a finger placed on the sensor face 118 of the placement portion 102 with a sufficient light amount of near-infrared light.
  • the light guiding part 124 is formed of a light-transmitting resin such as a silicone, for example, or other light-transmitting materials.
  • the light-transmitting material forming the light guiding part 124 is not particularly limited as long as it has a transmittance to the near-infrared light emitted from the plurality of near-infrared LEDs 122 , and various light-transmitting materials may be used.
  • the light guiding parts 124 are formed in the front-rear direction of the placement portion 102 so as to cover the plurality of near-infrared LEDs 122 that form a plurality of unit light sources each aligned in a line in the front-rear direction of the placement portion 102 .
  • the light guiding part 124 covering the plurality of near-infrared LEDs 122 scatters and guides near-infrared lights emitted from the plurality of near-infrared LEDs 122 and emits the near-infrared lights to a finger placed on the sensor face 118 of the placement portion 102 .
  • Each of the light guiding parts 124 has a ridge-like protrusion part 126 and a skirt-like edge part 128 formed integrally with the protrusion part 126 .
  • the protrusion part 126 is formed in a ridge-like manner so as to cover the plurality of near-infrared LEDs 122 and protrude above the placement portion 102 .
  • the edge part 128 is formed in a skirt-like manner integrally with the protrusion part 126 so as to extend on the sensor face 118 side of the protrusion part 126 continuously from the protrusion part 126 on the sensor face 118 side.
  • the edge part 128 has a lower height in the perpendicular direction of the placement portion 102 than the protrusion part 126 , and the height thereof gradually decreases toward the sensor face 118 side.
  • the protrusion part 126 has a convex surface protruding to the upward side of the placement portion 102 that is the opposite side of the sensor face 118 , for example.
  • the edge part 128 has a convex surface protruding to the downward side of the placement portion 102 that is the sensor face 118 side, for example.
  • Each of the light guiding parts 124 is formed so as to partially protrude and extend up to above the end of the sensor face 118 . More specifically, in the light guiding part 124 , the edge part 128 and a part of the protrusion part 126 on the edge part 128 side protrude over the end of the sensor face 118 and are located on the end of the sensor face 118 .
  • the partially protruding light guiding part 124 as discussed above is configured such that the surface thereof on the sensor face 118 side comes into contact with the surface of a finger on the sensor face 118 side placed on the sensor face 118 . As discussed above, by being formed so as to partially protrude and extend up to above the end of the sensor face 118 , the light guiding part 124 is configured to be able to support a finger placed on the placement portion 102 .
  • the protrusion width which is a width formed of the edge part 128 and a part of the protrusion part 126 on the edge part 128 side protruding and located over the end of the sensor face 118 , is constant over the front-rear direction of the placement portion 102 .
  • the protrusion width of the edge part 128 and a part of the protrusion part 126 on the edge part 128 side is not particularly limited and can be appropriately set in accordance with the size of a finger of the age group of a subject or the like.
  • each of the light guiding parts 124 on both sides may be configured such that the protrusion width of the edge part 128 and a part of the protrusion part 126 on the edge part 128 side is 5 mm, respectively, with respect to the image sensor 108 of a width of 20 mm.
  • the width of the sensor face 118 exposed between both the edge parts 128 is 10 mm.
  • Light shielding parts 130 are each provided on the under surface, which is on the sensor face 118 side, of the edge part 128 and a part of the protrusion part 126 , which is a part located protruding over the end of the sensor face 118 of the light guiding part 124 .
  • the under surface of the sensor face 118 side of the edge part 128 and a part of the protrusion part 126 provided with the light shielding part 130 is a flat surface parallel to the sensor face 118 at the capturing position.
  • the light shielding part 130 is provided for preventing the near-infrared light emitted from the near-infrared LEDs 122 from directly entering the image sensor 108 from the protrusion part 126 and the edge part 128 without passing through a finger.
  • the light shielding part 130 may be of a reflection type that blocks near-infrared light by reflecting near-infrared light entering the light shielding part 130 or may be of an absorption type that blocks near-infrared light by absorbing near-infrared light entering the light shielding part 130 .
  • a film, a foil, a sheet, or other light shielding member made of a light shielding material that blocks near-infrared light by reflecting or absorbing the near-infrared light as discussed above can be used.
  • a finger on the sensor face 118 can be irradiated with near-infrared lights not only from the protrusion part 126 but also from the edge part 128 that is closer to the sensor face 118 than the protrusion part 126 . Furthermore, the edge part 128 or the edge part 128 and the protrusion part 126 is in contact with the surface, which is on the sensor face 118 side, of a finger placed on the sensor face 118 .
  • the use of the edge part 128 described above can increase the light amount of near-infrared light entering the finger on the sensor face 118 . Therefore, according to the present example embodiment, a high quality fingerprint image with a high contrast can be acquired.
  • the light guiding part 124 in each side light source 112 not only guides the near-infrared lights emitted from the plurality of near-infrared LEDs 122 as described above but also functions as a support part configured to be able to support a finger placed on the sensor face 118 of the placement portion 102 . That is, in the light guiding part 124 , the edge part 128 and a part of the protrusion part 126 located protruding over the end of the sensor face 118 contact with the surface of a finger F on the sensor face 118 side placed on the sensor face 118 and support the finger F from the sensor face 118 side, as illustrated in FIG. 4 . With such the light guiding part 124 being provided, it is possible to stably support a finger whose fingerprint is to be captured and suppress or even prevent displacement of the finger from the sensor face 118 .
  • the fingerprint reading device 10 is configured such that the image sensor 108 and the sensor cover 110 including the sensor face 118 move between the capturing position and the recessed position as described above.
  • the edge part 128 and a part of the protrusion part 126 contact with the surface of the finger F on the sensor face 118 side and support the finger F from the sensor face 118 side.
  • This can suppress or even prevent displacement of the finger F due to motion of the image sensor 108 and the sensor cover 110 .
  • displacement of the finger F due to the motion can be suppressed or even prevented.
  • the image sensor 108 captures and reads a fingerprint of a finger placed on the sensor face 118 at the capturing position.
  • the sensor drive unit 114 causes the sensor face 118 in contact with the finger at the capturing position to move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position, as described later.
  • the image sensor 108 captures and reads a fingerprint of the finger in contact with the sensor face 118 that has returned from the recessed position to the capturing position.
  • the image sensor 108 captures and reads a fingerprint by using a near-infrared light scattered inside a finger and emitted from the surface of the finger.
  • the principle by which a fingerprint is captured by the image sensor 108 will be described below.
  • near-infrared lights are emitted from the pair of side light sources 112 with the ball of a finger being in contact with the sensor face 118 of the sensor cover 110 .
  • the near-infrared lights emitted from the pair of side light sources 112 that enter the finger on the sensor cover 110 .
  • the near-infrared lights that have entered the finger are scattered inside the finger and emitted outside the finger from the surface of the finger.
  • the near-infrared lights emitted outside the finger have different intensities in accordance with whether emitted from the ridge part of the fingerprint or emitted from the valley part of the fingerprint.
  • the near-infrared light emitted outside the finger from the ridge part of the fingerprint reaches and enters the image sensor 108 with a relatively high intensity without significant attenuation.
  • the valley part is not in contact with the sensor face 118 , the near-infrared light emitted outside the finger from the valley part of the fingerprint is scattered by the air layer present between the valley part and the sensor face 118 .
  • reflection and refraction occurs due to a refractive index difference at the interface between the skin and the air and between the air and the sensor cover 110 .
  • the near-infrared light emitted from the valley part significantly attenuates compared to the near-infrared light emitted from the ridge part and reaches and enters the image sensor 108 with a relatively low intensity or is unable to reach the image sensor 108 .
  • a fingerprint image in which a brightness difference is present between the ridge part and the valley part of the fingerprint is captured on the image sensor 108 . That is, in the captured fingerprint image, the ridge part of the fingerprint corresponds to a bright part, and the valley part of the fingerprint corresponds to a dark part.
  • the near-infrared lights scattered inside a finger and emitted outside the finger are received by the image sensor 108 in such a way, and thereby a fingerprint is captured.
  • the image sensor 108 that has captured a fingerprint of a finger outputs image data forming the fingerprint image. As described later, the image data output from the image sensor 108 is processed in the control circuit 116 and transferred to the image processing apparatus 20 via the communication cable 30 .
  • the image processing apparatus 20 to which the image data is transferred performs display, recording, or the like of the fingerprint image based on the transferred image data.
  • the sensor drive unit 114 is provided under the rear end part of the image sensor 108 inside the casing 106 of the placement portion 102 .
  • the sensor drive unit 114 is a drive unit that drives the rear end part of the image sensor 108 , which is attached to the casing 106 so as to be able to swing, to move up and down and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and move.
  • the sensor drive unit 114 causes the rear end part of the image sensor 108 positioned at the capturing position to move down and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and move from the capturing position to the recessed position. Further, the sensor drive unit 114 causes the rear end part of the image sensor 108 positioned at the recessed position to move up and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and move from the recessed position to the capturing position. In such a way, the sensor drive unit 114 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position.
  • the configuration of the sensor drive unit 114 is not limited to a particular configuration but may be any configuration that can move up and down the rear end part of the image sensor 108 .
  • the sensor drive unit 114 may have a solenoid-type configuration in which a solenoid is used as an actuator.
  • FIG. 5A and FIG. 5B illustrate an example having solenoid-type configuration as an example of the sensor drive unit 114 .
  • FIG. 5A is a side view illustrating a solenoid-type sensor drive unit 114 when the image sensor 108 is positioned at the capturing position.
  • FIG. 5B is a side view illustrating a solenoid-type sensor drive unit 114 when the image sensor 108 is positioned at the recessed position.
  • the solenoid-type sensor drive unit 114 has a solenoid 132 , a contact part 134 , and an elastic member 136 .
  • the solenoid 132 has a plunger 138 and a base part 140 including a coil, which is a pull-type solenoid in which the plunger 138 is pulled into the base part 140 in a conduction state.
  • the base part 140 of the solenoid 132 is provided on the bottom of the casing 106 so that the plunger 138 operates in the perpendicular direction of the casing 106 .
  • the contact part 134 is attached to the upper end of the plunger 138 .
  • the contact part 134 comes into contact with the underside of the rear end part of the image sensor 108 and supports the rear end part of the image sensor 108 .
  • the elastic member 136 such as a spring that actuates the contact part 134 to the image sensor 108 side is provided between the contact part 134 and the base part 140 .
  • the plunger 138 is not pulled into the base part 140 . Furthermore, the contact part 134 is actuated to the image sensor 108 side by the elastic member 136 . The contact part 134 actuated by the elastic member 136 comes into contact with the underside of the rear end part of the image sensor 108 and supports the rear end part of the image sensor 108 . In the non-conduction state, the image sensor 108 and the sensor cover 110 including the sensor face 118 are positioned at the capturing position.
  • the plunger 138 is pulled into the base part 140 .
  • the contact part 134 moves down against the actuation force applied by the elastic member 136 .
  • the rear end part of the image sensor 108 supported by the contact part 134 also moves down.
  • the contact part 134 comes into contact with the underside of the rear end part of the image sensor 108 at a position lower than the position in the non-conduction state and supports the image sensor 108 , as illustrated in FIG. 5B .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are positioned at the recessed position.
  • the solenoid-type sensor drive unit 114 moves down and up the rear end part of the image sensor 108 by using the contact part 134 attached to the plunger 138 .
  • the sensor drive unit 114 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to move between the capturing position and recessed position.
  • the solenoid-type one using the solenoid 132 can be used as the sensor drive unit 114 .
  • the drive mechanism of the sensor drive unit 114 that moves the image sensor 108 and the sensor cover 110 is not limited to the electric mechanism using the solenoid 132 described above.
  • the drive mechanism of the sensor drive unit 114 may be other electric mechanisms using a drive motor, a linear actuator, or the like that is driven electrically or may be a mechanical mechanism using a handle, a lever, a link, an arm, or the like that can be operated manually.
  • the holding portion 104 that is a rear side portion of the casing 106 is a portion held by the user who captures a finger of a subject whose fingerprint is to be captured when the fingerprint is captured.
  • a newborn, an infant, a young child, or the like is one who is unable to capture or has difficulty in capturing a fingerprint by himself/herself alone.
  • a user who is an adult or a minor who is able to operate the device by himself/herself alone operates the fingerprint reading device 10 to capture a fingerprint of a finger of a subject who is a newborn, an infant, a young child, or the like.
  • the user holds the holding portion 104 by one hand and moves the fingerprint reading device 10 from the front side thereof, namely, from the placement portion 102 toward the finger such as the thumb of the subject whose fingerprint is to be captured.
  • the user is able to hold the holding portion 104 from the side such that, among the fingers of the hand holding the holding portion 104 , the thumb is positioned on the top plate side of the casing 106 and the four fingers other than the thumb are positioned on the bottom plate side of the casing 106 , for example. Furthermore, as illustrated in FIG. 6 , the user is able to cause the ball of the finger of the subject to come into contact with the sensor face 118 of the sensor cover 110 while using the other hand if necessary. Note that, although not illustrated in FIG. 6 , the user is able to use the fingertip of the thumb or the like of his/her hand which holds the holding portion 104 to press the finger of the subject that is in contact with the sensor face 118 and fix the position thereof.
  • a push button-type motion switch 142 is provided on the bottom face of the holding portion 104 held by the user.
  • the motion switch 142 is configured to, when pressed, be able to drive the sensor drive unit 114 and move the image sensor 108 and the sensor cover 110 including the sensor face 118 . That is, the motion switch 142 is configured to, when pressed, be able to cause the image sensor 108 and the sensor cover 110 to move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position.
  • a push button-type capture switch 144 is provided on the bottom face of the holding portion 104 .
  • the capture switch 144 is configured to, when pressed, be able to instruct the side light sources 112 to be turned on or off, instruct the image sensor 108 to capture a fingerprint, or instruct the image processing apparatus 20 to record a fingerprint image.
  • the user holding the holding portion 104 is able to press the motion switch 142 and the capture switch 144 by any of four fingers positioned on the bottom plate side of the casing 106 out of the fingers of a hand holding the holding portion 104 while holding the holding portion 104 .
  • the motion switch 142 is formed so as to be embedded in the holding portion 104 such that the pressing face of the motion switch 142 and the bottom face of the holding portion 104 are substantially flat with each other.
  • the capture switch 144 is formed so as to be embedded in the holding portion 104 such that the pressing face of the capture switch 144 and the bottom face of the holding portion 104 are substantially flat with each other.
  • the control circuit 116 is accommodated inside the holding portion 104 of the casing 106 . Further, a connector unit 146 to which the communication cable 30 is connected is provided on the side end part on the rear side of the holding portion 104 .
  • FIG. 7 is a block diagram illustrating respective components of the fingerprint reading device 10 described above, which illustrates the image sensor 108 , the side light source 112 , the sensor drive unit 114 , and the control circuit 116 in detail.
  • the image sensor 108 has a pixel array 148 and a timing generator 150 . Further, the image sensor 108 has a vertical scanning circuit 152 , a column amplifier circuit 154 , an analog-to-digital (A/D) converter circuit 156 , a horizontal scanning circuit 158 , and a signal processing circuit 160 .
  • A/D analog-to-digital
  • a plurality of pixels are provided in a matrix in the pixel array 148 .
  • Each pixel has a photoelectric conversion element that generates a pixel signal by photoelectrically converting an incident near-infrared light.
  • the timing generator 150 generates and outputs a timing signal used for controlling the vertical scanning circuit 152 and the horizontal scanning circuit 158 .
  • the vertical scanning circuit 152 scans the pixels of the pixel array 148 on a pixel row basis.
  • the column amplifier circuit 154 amplifies pixel signals read by scans performed by the vertical scanning circuit 152 .
  • the A/D converter circuit 156 converts pixel signals amplified by the column amplifier circuit 154 from analog signals to digital signals.
  • the horizontal scanning circuit 158 performs scans on a pixel column basis to read pixel signals converted by the A/D converter circuit 156 to the outside.
  • the signal processing circuit 160 performs predetermined signal processing on the pixel signal read by the horizontal scanning circuit 158 and output from the A/D converter circuit 156 to output image data forming a fingerprint image.
  • the image data output from the signal processing circuit 160 is input to the control circuit 116 .
  • a current limiting resistor 162 that restricts a current flowing in the near-infrared LED 122 and a transistor 164 that serves as a switch are connected to each of the plurality of near-infrared LED 122 .
  • One of the terminals of the current limiting resistor 162 is connected to the anode side terminal of each near-infrared LED 122 .
  • the collector of each transistor 164 is connected to the cathode side terminal of each near-infrared LED 122 .
  • a positive power source voltage VDD is input to the other terminal of each current limiting resistor 162 .
  • the base of each transistor 164 is connected to the control circuit 116 , and the transistor 164 is switched to be turned on and off by a switch signal input to the base from the control circuit 116 .
  • the control circuit 116 has a central processing unit (CPU) 166 , a read only memory (ROM) 168 , and a random access memory (RAM) 170 . Further, the control circuit 116 has a video controller 172 , an interface (I/F) 174 , and a communication controller 176 . Furthermore, the control circuit 116 has a voltage regulator 178 .
  • the CPU 166 , the ROM 168 , the RAM 170 , the video controller 172 , the I/F 174 , and the communication controller 176 are connected to a common bus line 180 .
  • the CPU 166 executes a program for controlling the operation of the fingerprint reading device 10 to control the operation of each unit of the fingerprint reading device 10 .
  • the ROM 168 stores a program executed by the CPU 166 .
  • the RAM 170 is a working area when the CPU 166 executes a program.
  • the video controller 172 is connected to the signal processing circuit 160 of the image sensor 108 , and image data is input from the signal processing circuit 160 .
  • the video controller 172 transfers image data to the communication controller 176 via the bus line 180 .
  • the timing generator 150 of the image sensor 108 is connected to the I/F 174 . Thereby, the control signal by the CPU 166 is input to the timing generator 150 via the I/F 174 .
  • the timing generator 150 generates and outputs a timing signal based on a control signal input via the I/F 174 .
  • the bases of the plurality of transistors 164 in the side light source 112 are connected to the I/F 174 .
  • the switch signal from the CPU 166 is input to the base of the transistors 164 via the I/F 174 .
  • the transistor 164 is switched to be turned on and off based on a switch signal input via the I/F 174 .
  • the near-infrared LED 122 is switched to be turned on and off, and thereby the side light source 112 is switched to be turned on and off.
  • the sensor drive unit 114 has the solenoid 132 and a driver 182 that controls driving of the solenoid 132 .
  • the driver 182 is connected to the I/F 174 . Thereby, a control signal from the CPU 166 is input to the driver 182 via the I/F 174 .
  • the driver 182 controls driving of the solenoid 132 based on the control signal input via the I/F 174 .
  • the motion switch 142 is connected to the I/F 174 .
  • the output of a control signal of the driver 182 from the CPU 166 is triggered in response to press of the motion switch 142 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are positioned at the capturing position.
  • the solenoid 132 is driven by the driver 182 in the sensor drive unit 114 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position.
  • the motion switch 142 is not necessarily required to be provided. Instead, such a configuration is possible in which, in response to detection of contact of a finger with the sensor face 118 , output of the control signal of the driver 182 is triggered, and the image sensor 108 and the sensor cover 110 including the sensor face 118 are moved from the capturing position toward the recessed position by the sensor drive unit 114 , in the same manner as described above.
  • contact of the finger on the sensor face 118 can be detected based on a change in an image captured by the image sensor 108 , for example, or can be detected by a sensor that can detect contact thereon, such as a touch sensor provided on the sensor face 118 .
  • the operating time period in which the image sensor 108 and the sensor cover 110 return to the capturing position via the recessed position from the capturing position is not particularly limited but may be set as appropriate. However, it is preferable to set this operating time period to a time period during which elastic deformation of a finger that once comes into contact with the sensor face 118 is sufficiently reduced.
  • the capture switch 144 is connected to the I/F 174 . In response to the capture switch 144 being pressed, output of a control signal of the image sensor 108 and a switch signal of the side light source 112 from the CPU 166 are triggered.
  • the side light source 112 in a non-operating state of the image sensor 108 , the side light source 112 is also in a turn-off state, and when the capture switch 144 is pressed under this state, the side light source 112 is turned off and the image sensor 108 starts capturing a fingerprint.
  • the image sensor 108 that has captured a fingerprint outputs image data of the captured fingerprint image. After outputting the image data, the image sensor 108 is in a non-operating state, and the side light source 112 is in a turn-off state.
  • the image data of the fingerprint image output by the image sensor 108 is transferred to the image processing apparatus 20 .
  • the communication controller 176 functions as a transfer unit that transfers image data of the fingerprint image, which transfers image data transferred from the video controller 172 to the image processing apparatus 20 via the communication cable 30 connected to the connector unit 146 .
  • the communication controller 176 is configured to communicate with the image processing apparatus 20 via the communication cable 30 in accordance with a communication standard such as Universal Serial Bus (USB) or the like, for example.
  • USB Universal Serial Bus
  • the communication cable 30 is configured to have two differential signal lines for transmitting and receiving signals, a power source line for power supply, and a ground line.
  • the communication controller 176 transmits and receives signals through the two differential signal lines in the communication cable 30 .
  • the power source line of the communication cable 30 is connected to the voltage regulator 178 , and power is supplied via the power source line from a power source circuit 216 (see FIG. 8 ) in the image processing apparatus 20 .
  • the voltage regulator 178 adjusts the voltage of the supplied power and supplies it as a power source to each unit of the fingerprint reading device 10 .
  • the fingerprint reading device 10 is of a bus-power system so as to operate by power supplied via the communication cable 30 from the image processing apparatus 20 in such a way. Note that the fingerprint reading device 10 may be operated by power supplied from a built-in battery, for example, without limited to the bus-power system.
  • the image processing apparatus 20 functions as an image processing unit that performs processes such as display, recording, or the like on a fingerprint image transferred from the fingerprint reading device 10 that has captured a fingerprint.
  • the image processing apparatus 20 may be formed of a personal computer (PC) device of a laptop type, a tablet type, or the like, for example. Further, image processing apparatus 20 can control the operation of the fingerprint reading device 10 . Note that the image processing apparatus 20 is not necessarily required to include the display 214 described later, and the image processing unit can be configured as including no display unit.
  • FIG. 8 is a block diagram illustrating the image processing apparatus 20 .
  • the image processing apparatus 20 has a CPU 202 , a ROM 204 , a RAM 206 , a hard disk drive (HDD) 208 , and a communication controller 210 . Further, the image processing apparatus 20 has a display controller 212 and the display 214 . Further, the image processing apparatus 20 has the power source circuit 216 and an input device 218 .
  • the CPU 202 , the ROM 204 , the RAM 206 , the HDD 208 , the communication controller 210 , display controller 212 , the power source circuit 216 , and the input device 218 are connected to a common bus line 220 . Further, a connector unit 222 to which the communication cable 30 is connected is provided to the image processing apparatus 20 .
  • the CPU 202 controls the entire operation of the image processing apparatus 20 . Further, the CPU 202 executes an image processing program used for display, recording, or the like of a fingerprint image acquired by the fingerprint reading device 10 .
  • the image processing program performs image processing on image data transferred from the fingerprint reading device 10 and performs display, recording, or the like of a fingerprint image thereof.
  • the ROM 204 stores therein a program such as a boot program.
  • the RAM 206 is used as a working area when the CPU 202 executes a process. Further, the RAM 206 functions as an image memory in which image data of a fingerprint image transferred from the fingerprint reading device 10 is temporarily stored.
  • the HDD 208 stores a program such as an image processing program executed by the CPU 202 .
  • the HDD 208 functions as a recording unit that records a fingerprint image captured by the fingerprint reading device 10 .
  • the CPU 202 functions as a record control unit to record a fingerprint image in the HDD 208 .
  • the recording unit that records a fingerprint image is not limited to the HDD 208 and, instead of the HDD 208 , various recording devices may be used as the recording unit.
  • the recording unit that records a fingerprint image may be built in the image processing apparatus 20 similarly to the HDD 208 or may be an independent external recording device separate from the image processing apparatus 20 .
  • the communication controller 210 functions as a receiving unit that receives image data of a fingerprint image to receive image data transferred from the communication controller 176 of the fingerprint reading device 10 via the communication cable 30 connected to the connector unit 222 .
  • the image data received by the communication controller 210 is temporarily stored in the RAM 206 as an image memory.
  • the communication controller 210 is configured to communicate with the fingerprint reading device 10 via the communication cable 30 in accordance with a communication standard such as USB or the like, for example, in association with the communication controller 176 .
  • the communication controller 210 is configured to transmit and receive signals by two differential signal lines in the communication cable 30 in association with the communication controller 176 .
  • the display 214 that functions as a display unit that displays a fingerprint image is connected to the display controller 212 .
  • the display controller 212 cooperates with the CPU 202 to function as a display control unit and renders and displays a display window of an image processing program executed by the CPU 202 on the display 214 .
  • the display window of the image processing program displayed on the display 214 includes a preview window in which a captured fingerprint image is displayed.
  • the display 214 is a liquid crystal display, for example.
  • the display 214 may be built in the image processing apparatus 20 , which is a laptop PC, a tablet PC, or the like, or may be an external display provided separately from the image processing apparatus 20 .
  • the power source circuit 216 supplies power of a built-in power source of the image processing apparatus 20 or power of an external power source connected to the image processing apparatus 20 to the fingerprint reading device 10 .
  • the power source circuit 216 is connected to the power source line and the ground line of the communication cable 30 and supplies power to the voltage regulator 178 of the fingerprint reading device 10 via the power source line.
  • the input device 218 is a keyboard, a mouse, or the like, for example. Further, the input device 218 may be a touch panel embedded in the display 214 . An operator can input text information such as an identification number (ID), a name, or the like of a subject or select information regarding the type of a finger in the image processing program displayed on the display 214 via the input device 218 . Further, setting of capturing conditions or the like may be performed.
  • ID identification number
  • a name a name, or the like of a subject
  • setting of capturing conditions or the like may be performed.
  • the fingerprint reading system 1 is configured as described above.
  • FIG. 9A to FIG. 9C are schematic diagrams illustrating the operation of the fingerprint reading device 10 according to the present example embodiment.
  • FIG. 9A to FIG. 9C illustrate the positional relationship of the finger F with the image sensor 108 and the sensor cover 110 after the finger F comes into contact with the sensor face 118 and before a fingerprint is captured.
  • the side light sources 112 are omitted in FIG. 9A to FIG. 9C .
  • FIG. 10C are schematic diagrams illustrating the principle by which elastic deformation of a fingerprint is reduced when the fingerprint is read by the fingerprint reading device 10 according to the present example embodiment.
  • FIG. 10A is a schematic diagram schematically illustrating an ideal fingerprint to be read.
  • FIG. 10B is a schematic diagram schematically illustrating a fingerprint to be read from a finger which is subjected to significant elastic deformation.
  • FIG. 10C is a schematic diagram schematically illustrating a fingerprint to be read from a finger in which elastic deformation has been reduced.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are positioned at the capturing position.
  • the user causes the ball of the finger F of the subject to come into contact with the sensor face 118 of the fingerprint reading device 10 , as illustrated in FIG. 9A .
  • the sensor face 118 is slid onto the ball of the finger F from the front side of the placement portion 102 , which is the front side of the casing 106 , so that the finger F is directed in the longitudinal direction of the casing 106 , that is, the front-rear direction of the placement portion 102 , and thereby the ball of the finger F comes into contact with the sensor face 118 .
  • the edge part 128 and a part of the protrusion part 126 located protruding over the end of the sensor face 118 come into contact with the surface of the finger F on the sensor face 118 side placed on the sensor face 118 .
  • the edge part 128 and a part of the protrusion part 126 in contact with the surface on the sensor face 118 side of the finger F support the finger F in contact with the sensor face 118 from the sensor face 118 side.
  • a fingerprint read from the finger F where large elastic deformation occurs shrinks entirely in the sliding direction of the sensor face 118 , that is, the longitudinal direction of the finger F as illustrated in FIG. 10B .
  • a fingerprint may not only shrink but also deform in various manners such as expanding, bending, or the like in response to force applied to the finger F.
  • a fingerprint may be deformed entirely as illustrated in FIG. 10B , or a part thereof may be deformed locally.
  • the user may press the motion switch 142 .
  • a drive instruction signal is input to instruct the fingerprint reading device 10 to drive the image sensor 108 and the sensor cover 110 .
  • the CPU 166 of the fingerprint reading device 10 drives the sensor drive unit 114 in response to the drive instruction signal input by press of the motion switch 142 and drives the image sensor 108 and the sensor cover 110 including the sensor face 118 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 swing about a rocking shaft of the hinge part 120 attached to the casing 106 of the front end part of the image sensor 108 as a fulcrum.
  • the drive instruction signal is input, and the image sensor 108 and the sensor cover 110 including the sensor face 118 are driven by the sensor drive unit 114 in the same manner as described above.
  • the sensor face 118 separates from the ball of the finger F.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 move from the capturing position toward the recessed position with the rear end part thereof moving down.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 that have moved to the recessed position move and return from the recessed position to the capturing position with the rear end part moving up, as illustrated in FIG. 9C .
  • the sensor face 118 again comes into contact with the ball of the finger F.
  • the CPU 166 of the fingerprint reading device 10 can use various triggers as a trigger for the switching from moving down to moving up of the rear end part of the image sensor 108 and the sensor cover 110 .
  • the CPU 166 can use this as a trigger and drive the sensor drive unit 114 so as to move up the rear end part of the image sensor 108 and the sensor cover 110 . That is, in response to detection of separation of the finger F from the sensor face 118 moving from the capturing position toward the recessed position, the sensor drive unit 114 moves the image sensor 108 and the sensor cover 110 including the sensor face 118 toward the capturing position.
  • the separation of the finger F from the sensor face 118 can be detected based on a change in an image captured by the image sensor 108 , for example, or can be detected by a sensor that can detect contact such as a touch sensor provided on the sensor face 118 .
  • the motion switch 142 when the user uses the motion switch 142 to manually move the image sensor 108 and the sensor cover 110 , the following configuration is possible. That is, such a configuration is possible in which another press of the motion switch 142 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 moving from the capturing position toward the recessed position to change the moving direction and move from the recessed position toward the capturing position.
  • the CPU 166 of the fingerprint reading device 10 or the CPU 202 of the image processing apparatus 20 in response to detecting the separation of the sensor face 118 from the finger F, notifies the user that the sensor face 118 has separated from the finger F by using a notification light, a notification sound, a screen display, or the like, for example.
  • the user who has been notified of the separation of the sensor face 118 from the finger F again presses the motion switch 142 .
  • Another press of the motion switch 142 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to move from the recessed position, which is the position where the sensor face 118 that has separated from the finger F, toward the capturing position.
  • the sensor face 118 once separates from the ball of the finger F at the recessed position. Subsequently, the sensor face 118 again comes into contact with the ball of the finger F at the capturing position recovered from the recessed position. The sensor face 118 once separates from the ball of the finger F, which can reduce or even remove elastic deformation of the finger F generated at the first contact of the sensor face 118 . In the present example embodiment, after elastic deformation of the finger F is reduced or even removed in such a way, the fingerprint of the finger F is captured and read, and a fingerprint image is acquired as described below.
  • the read fingerprint as illustrated in FIG. 10C is substantially the same as the ideal fingerprint illustrated in FIG. 10A .
  • the light guiding parts 124 support the finger F. That is, meanwhile, the edge parts 128 and parts of the protrusion parts 126 , which correspond to portions of the light guiding parts 124 located extending over the ends of the sensor face 118 support the finger F from the sensor face 118 side. Therefore, according to the present example embodiment, although the sensor face 118 once separates from the ball of the finger F, displacement of the finger F can be suppressed or even prevented, and therefore the fingerprint of the finger F can be read more appropriately, and a higher quality fingerprint image can be acquired.
  • Japanese Patent Application Publication No. 2005-182474 discloses a configuration in which, in response to detection of a finger being placed on the placement portion, a fingerprint sensor is moved up to the placement portion by a motor.
  • a fingerprint sensor since the fingerprint sensor is located at a move-down position separated from the placement portion at time other than the time of reading a fingerprint, it is difficult to secure air tightness inside the casing, and thus there is a problem of dust resistance.
  • the image sensor 108 and the sensor cover 110 are normally positioned at the capturing position and seal the inside of the placement portion 102 and, at the time of reading a fingerprint, are caused to move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position.
  • the image sensor 108 and the sensor cover 110 since the image sensor 108 and the sensor cover 110 normally seal the inside of the placement portion 102 , good dust resistance can be secured.
  • the user may press the capture switch 144 .
  • a capture instruction signal is input to instruct the fingerprint reading device 10 of capturing.
  • the CPU 166 of the fingerprint reading device 10 drives the image sensor 108 and turns on the side light sources 112 .
  • the fingerprint reading device 10 captures and reads a fingerprint of the finger F by using the image sensor 108 and acquires a fingerprint image.
  • the CPU 166 of the fingerprint reading device 10 turns off the side light sources 112 .
  • the CPU 166 of the fingerprint reading device 10 transfers the image data of the acquired fingerprint image to the image processing apparatus 20 via the communication cable 30 .
  • the CPU 202 performs predetermined image processing on image data. Furthermore, the CPU 202 of the image processing apparatus 20 displays the fingerprint image on the display 214 . Further, the CPU 202 of the image processing apparatus 20 records the fingerprint image in the HDD 208 or the like in response to input of a recording instruction from the user or automatically.
  • FIG. 11 to FIG. 13 A fingerprint reading device and a fingerprint reading method according to a second example embodiment of the present invention will be described by using FIG. 11 to FIG. 13 . Note that the same components as those in the fingerprint reading device according to the first example embodiment described above are labeled with the same references, and the description thereof will be omitted or simplified.
  • the basic configuration of the fingerprint reading device according to the present example embodiment is substantially the same as the configuration of the fingerprint reading device 10 according to the first example embodiment described above.
  • the fingerprint reading device according to the present example embodiment is different from the fingerprint reading device 10 according to the first example embodiment in the position where the image sensor 108 is attached to the casing 106 and in a feature in which the image sensor 108 is supported and moved down and up by the sensor drive unit 114 .
  • FIG. 11 is a plan view illustrating the fingerprint reading device according to the present example embodiment, which illustrates a plane viewed from the front face side out of the front face and the back face of the fingerprint reading device.
  • FIG. 12 is a longitudinal sectional view illustrating the fingerprint reading device according to the present example embodiment, which illustrates a longitudinal sectional view taken along a line A-A of FIG. 11 .
  • the rear end part of the image sensor 108 is attached to a top plate front end of the holding portion 104 in the casing 106 via a hinge part 2120 .
  • the hinge part 2120 includes a rocking shaft extending in the width direction of the placement portion 102 in the casing 106 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are provided so as to be swing about a rocking shaft of the hinge part 2120 located at the rear side end of the placement portion 102 as a fulcrum. This enables the image sensor 108 and the sensor cover 110 including the sensor face 118 to move between a capturing position, which is the first position, and a recessed position, which is the second position, located inside the casing 106 deeper than the capturing position.
  • the image sensor 108 and the sensor cover 110 are arranged such that the sensor face 118 of the sensor cover 110 is orthogonal to the perpendicular direction of the placement portion 102 as with the first example embodiment.
  • the image sensor 108 and the sensor cover 110 positioned at the capturing position seal the inside of the placement portion 102 as with the first example embodiment.
  • the image sensor 108 and the sensor cover 110 are arranged such that the sensor face 118 of the sensor cover 110 is inclined to face the frontward oblique upper direction of the placement portion 102 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are driven by a sensor drive unit 2114 similar to the sensor drive unit 114 according to the first example embodiment and move between the capturing position and the recessed position.
  • the image sensor 108 and the sensor cover 110 at the capturing position are illustrated by the solid line, and the image sensor 108 and the sensor cover 110 at the recessed position are illustrated by the one-dot-chain line.
  • the sensor face 118 of the sensor cover 110 at the capturing position is orthogonal to the perpendicular direction of the placement portion 102 and forms a flat face with the surface of the holding portion 104 with substantially no step in a similar manner to the first example embodiment.
  • the sensor face 118 of the sensor cover 110 at the recessed position is inclined so as to enter the inside of the casing 106 in the direction from the rear side to the front side of the placement portion 102 .
  • the fingerprint reading device 2010 has the sensor drive unit 2114 instead of the sensor drive unit 114 according to the first example embodiment.
  • the sensor drive unit 2114 is provided under the front end part of the image sensor 108 inside the casing 106 of the placement portion 102 .
  • the sensor drive unit 2114 has the same drive mechanism as that of the sensor drive unit 114 according to the first example embodiment.
  • the sensor drive unit 2114 drives the front end part of the image sensor 108 , which is attached to the casing 106 so as to be able to swing, to move up and down and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and move.
  • the sensor drive unit 2114 causes the front end part of the image sensor 108 positioned at the capturing position to move down and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and move from the capturing position to the recessed position. Further, the sensor drive unit 2114 causes the front end part of the image sensor 108 positioned at the recessed position to move up and causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to swing and move from the recessed position to the capturing position. In such a way, the sensor drive unit 2114 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position.
  • the configuration of the sensor drive unit 2114 is not limited to a particular configuration as with the sensor drive unit 114 according to the first example embodiment as long as it can move down and up the front end part of the image sensor 108 .
  • the sensor drive unit 2114 may have a solenoid-type configuration in which a solenoid is used as an actuator as with the sensor drive unit 114 according to the first example embodiment.
  • FIG. 13A to FIG. 13C are schematic diagrams illustrating the operation of the fingerprint reading device 2010 according to the present example embodiment.
  • FIG. 13A to FIG. 13C illustrate the positional relationship of the finger F with the image sensor 108 and the sensor cover 110 while the finger F comes into contact with the sensor face 118 and then a fingerprint is captured.
  • the side light sources 112 are omitted in FIG. 13A to FIG. 13C .
  • the user causes the ball of the finger F of the subject to come into contact with the sensor face 118 of the fingerprint reading device 2010 , as illustrated in FIG. 13A .
  • the edge part 128 and a part of the protrusion part 126 in contact with the surface of the finger F on the sensor face 118 side support the finger F in contact with the sensor face 118 .
  • the user presses the motion switch 142 in a similar manner to the first example embodiment.
  • a drive instruction signal is input to instruct the fingerprint reading device 2010 to drive the image sensor 108 and the sensor cover 110 .
  • the CPU 166 of the fingerprint reading device 2010 drives the sensor drive unit 2114 in response to the drive instruction signal input by press of the motion switch 142 and drives the image sensor 108 and the sensor cover 110 including the sensor face 118 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 swing about a rocking shaft of the hinge part 2120 attached to the casing 106 of the rear end part of the image sensor 108 as a fulcrum.
  • the drive instruction signal is input, and the image sensor 108 and the sensor cover 110 are driven by the sensor drive unit 2114 in the same manner as described above.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 that start swinging first move from the capturing position to the recessed position with the front end part thereof moving down, as illustrated in FIG. 13B .
  • the sensor face 118 separates from the ball of the finger F.
  • the image sensor 108 and the sensor cover 110 move from the capturing position toward the recessed position with the front end part thereof moving down.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 that have moved to the recessed position move and return from the recessed position to the capturing position with the front end part moving up, as illustrated in FIG. 13C .
  • the sensor face 118 again comes into contact with the ball of the finger F.
  • the CPU 166 of the fingerprint reading device 2010 can use various triggers as a trigger for the switching from moving down to moving up of the front end part of the image sensor 108 and the sensor cover 110 .
  • the CPU 166 can use this as a trigger and drive the sensor drive unit 2114 to move up the front end part of the image sensor 108 and the sensor cover 110 . That is, in response to detection of separation of the finger F from the sensor face 118 moving from the capturing position toward the recessed position, the sensor drive unit 2114 moves the image sensor 108 and the sensor cover 110 including the sensor face 118 toward the capturing position.
  • the separation of the finger F from the sensor face 118 can be detected in a similar manner to the first example embodiment.
  • the present example embodiment may be configured such that, in a similar manner to the first example embodiment, another press of the motion switch 142 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 moving from the capturing position toward the recessed position to change the moving direction and move from the recessed position toward the capturing position.
  • the sensor face 118 once separates from the ball of the finger F at the recessed position. Subsequently, the sensor face 118 again comes into contact with the ball of the finger F at the capturing position recovered from the recessed position. Thereby, also in the present example embodiment, elastic deformation of the finger F generated at the first contact to the sensor face 118 can be reduced or even removed. Therefore, according to the present example embodiment, even when reading a fingerprint of the finger F which is relatively soft and may be easily elastically deformed, it is possible to appropriately read the fingerprint and acquire a high quality fingerprint image.
  • the edge parts 128 and parts of the protrusion parts 126 in the light guiding parts 124 support the finger F from the sensor face 118 side. Therefore, according to the present example embodiment, although the sensor face 118 once separates from the ball of the finger F, displacement of the finger F can be suppressed or even prevented, and therefore the fingerprint of the finger F can be read more appropriately, and a higher quality fingerprint image can be acquired.
  • the hinge part 2120 includes a rocking shaft extending in the front-rear direction of the placement portion 102 in the casing 106 , for example.
  • a sensor drive unit that drives the other side end part of the image sensor 108 to move up and down, which is similar to the sensor drive unit 114 , may be provided inside the placement portion 102 .
  • a fingerprint reading device and a fingerprint reading method according to a third example embodiment of the present invention will be described by using FIG. 14 to FIG. 17 .
  • the basic configuration of the fingerprint reading device according to the present example embodiment is substantially the same as the configuration of the fingerprint reading device 10 according to the first example embodiment described above.
  • the fingerprint reading device according to the present example embodiment is different from the fingerprint reading device 10 according to the first example embodiment in a manner of motion of the image sensor 108 and the sensor cover 110 .
  • FIG. 14 is a plan view illustrating the fingerprint reading device according to the present example embodiment, which illustrates a plane viewed from the front face side out of the front face and the back face of the fingerprint reading device.
  • FIG. 15 is a longitudinal sectional view illustrating the fingerprint reading device according to the present example embodiment, which illustrates a longitudinal sectional view taken along a line A-A of FIG. 14 .
  • FIG. 16A and FIG. 16B are schematic diagram illustrating an example of a sensor drive unit in the fingerprint reading device according to the present example embodiment.
  • the image sensor 108 is attached to the bottom inside the casing 106 of the placement portion 102 via a sensor drive unit 3114 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are able to parallelly shift in the perpendicular direction of the casing 106 via the sensor drive unit 3114 .
  • the direction in which the image sensor 108 and the sensor cover 110 are able to parallelly shift is the direction orthogonal to the sensor face 118 . This enables the image sensor 108 and the sensor cover 110 including the sensor face 118 to move between a capturing position, which is the first position, and a recessed position, which is the second position, located inside the casing 106 deeper than the capturing position.
  • the image sensor 108 and the sensor cover 110 are not inclined, and the sensor face 118 of the sensor cover 110 remains orthogonal to the perpendicular direction of the casing 106 . Note that the image sensor 108 and the sensor cover 110 positioned at the capturing position seal the inside of the placement portion 102 in a similar manner to the first example embodiment.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are driven by the sensor drive unit 3114 and move between the capturing position and the recessed position.
  • the image sensor 108 and the sensor cover 110 at the capturing position are illustrated by the solid line, and the image sensor 108 and the sensor cover 110 at the recessed position are illustrated by the one-dot-chain line.
  • the sensor face 118 of the sensor cover 110 at the capturing position is orthogonal to the perpendicular direction of the placement portion 102 and forms a flat face with the surface of the holding portion 104 with substantially no step in a similar manner to the first example embodiment.
  • the sensor face 118 of the sensor cover 110 at the recessed position is located inside the casing 106 deeper than when positioned at the capturing position and remains orthogonal to the perpendicular direction of the placement portion 102 .
  • the fingerprint reading device 3010 has the sensor drive unit 3114 instead of the sensor drive unit 114 according to the first example embodiment.
  • the sensor drive unit 3114 is provided under the center part of the image sensor 108 in the casing 106 of the placement portion 102 .
  • the image sensor 108 is attached on the top of the sensor drive unit 3114 .
  • the sensor drive unit 3114 drives the image sensor 18 attached on the top thereof to move down and up and parallelly shifts the image sensor 108 and the sensor cover 110 .
  • the sensor drive unit 3114 causes the entire image sensor 108 positioned at the capturing position to move down and thereby the image sensor 108 and the sensor cover 110 including the sensor face 118 to parallelly shift from the capturing position to the recessed position. Further, the sensor drive unit 3114 causes the entire image sensor 108 positioned at the recessed position to move up and thereby the image sensor 108 and the sensor cover 110 including the sensor face 118 to parallelly shift from the recessed position to the capturing position. In such a way, the sensor drive unit 3114 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 to move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position.
  • the configuration of the sensor drive unit 3114 is not limited to a particular configuration, and any configuration that can move down and up the entire image sensor 108 may be employed.
  • the sensor drive unit 3114 may have a pantograph-type configuration in which a pantograph mechanism is used.
  • FIG. 16A and FIG. 16B illustrate one having a pantograph-type configuration as an example of the sensor drive unit 3114 .
  • FIG. 16A is a side view illustrating the pantograph-type sensor drive unit 3114 when the image sensor 108 is positioned at the capturing position.
  • FIG. 16B is a side view illustrating the pantograph-type sensor drive unit 3114 when the image sensor 108 is positioned at the recessed position.
  • the pantograph-type sensor drive unit 3114 has a base 3116 , a pantograph mechanism including pantograph arms 3118 , and a support part 3120 . Note that two pantograph arms 3118 are provided adjacently in parallel, for example. Further, the pantograph-type sensor drive unit 3114 has a drive mechanism 3122 that drives the pantograph arms 3118 .
  • the base 3116 is provided on the bottom inside the casing 106 in the placement portion 102 .
  • the support part 3120 is provided above the base 3116 via the pantograph arms 3118 .
  • the drive mechanism 3122 is provided on the base 3116 .
  • One end and the other end on the lower side of the pantograph arms 3118 are pivotally supported on the base 3116 .
  • One of the one end and the other end on the lower side of the pantograph arm 3118 is slidable along the base 3116 .
  • One end and the other end on the upper side of the pantograph arms 3118 are pivotally supported on the support part 3120 .
  • One of the one end and the other end on the upper side of the pantograph arm 3118 is slidable along the support part 3120 .
  • the drive mechanism 3122 drives one end on the lower side of the pantograph arms 3118 to slide.
  • the drive mechanism 3122 is not limited to a particular mechanism, and may be a mechanism that performs electrical slide driving or may be a mechanism that performs mechanical slide driving.
  • an electrical drive mechanism that drives one end on the lower side of the pantograph arms 3118 to slide by using a ball screw rotated by a drive motor, a solenoid, or the like can be used.
  • a mechanical drive mechanism that drives one end on the lower side of the pantograph arms 3118 to slide by using a manually operated lever or the like can be used, for example.
  • the pantograph arms 3118 expand and contract in the perpendicular direction of the casing 106 by one end on the lower side thereof being driven by the drive mechanism 3122 and sliding. That is, the pantograph arms 3118 expand by one end on the lower side thereof being driven by the drive mechanism 3122 and sliding so that one end on the lower side thereof approaches the other end. Further, the pantograph arms 3118 contract by one end on the lower side thereof being driven by the drive mechanism 3122 and sliding so that one end on the lower side thereof separates from the other end.
  • the image sensor 108 is attached to the support part 3120 .
  • the image sensor 108 and the sensor cover 110 are supported so that the sensor face 118 is orthogonal to the perpendicular direction of the casing 106
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 supported by the support part 3120 are positioned at the capturing position.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 supported by the support part 3120 move down from the capturing position. Thereby, the image sensor 108 and the sensor cover 110 including the sensor face 118 move to the recessed position.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 supported by the support part 3120 move and return from the recessed position to the capturing position.
  • the pantograph-type sensor drive unit 3114 moves down and up the whole of the image sensor 108 and the sensor cover 110 by using the pantograph arms 3118 .
  • the sensor drive unit 3114 causes the image sensor 108 and the sensor cover 110 to parallelly shift and thereby the image sensor 108 and the sensor cover 110 including the sensor face 118 to move between the capturing position and the recessed position.
  • a pantograph-type one having a pantograph mechanism can be used as the sensor drive unit 3114 .
  • FIG. 17A to FIG. 17C are schematic diagrams illustrating the operation of the fingerprint reading device 3010 according to the present example embodiment.
  • FIG. 17A to FIG. 17C illustrate the positional relationship of the finger F with the image sensor 108 and the sensor cover 110 after the finger F comes into contact with the sensor face 118 and before a fingerprint is captured.
  • the side light sources 112 are omitted in FIG. 17A to FIG. 17C .
  • the user causes the ball of the finger F of a subject to come into contact with the sensor face 118 of the fingerprint reading device 3010 , as illustrated in FIG. 17A .
  • the edge parts 128 and parts of the protrusion parts 126 in contact with the surface of the finger F on the sensor face 118 side support the finger F in contact with the sensor face 118 from the sensor face 118 side.
  • the user presses the motion switch 142 in the similar manner to the first example embodiment.
  • a drive instruction signal is input to instruct the fingerprint reading device 3010 to drive the image sensor 108 and the sensor cover 110 .
  • the CPU 166 of the fingerprint reading device 3010 drives the sensor drive unit 3114 in response to the drive instruction signal input by press of the motion switch 142 and drives the image sensor 108 and the sensor cover 110 including the sensor face 118 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 parallelly shift in the perpendicular direction of the casing 106 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 that starts parallelly shifting first move down as a whole and move from the capturing position to the recessed position, as illustrated in FIG. 17B .
  • the sensor face 118 separates from the ball of the finger F.
  • the image sensor 108 and the sensor cover 110 move down as a whole and move from the capturing position toward the recessed position.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 that have moved to the recessed position move up as a whole and move and return from the recessed position to the capturing position, as illustrated in FIG. 17C .
  • the sensor face 118 again comes into contact with the ball of the finger F.
  • the CPU 166 of the fingerprint reading device 3010 can use various triggers as a trigger for the switching from moving down to moving up of the whole of the image sensor 108 and the sensor cover 110 .
  • the CPU 166 can use this detection as a trigger and drive the sensor drive unit 3114 so as to move up the whole of the image sensor 108 and the sensor cover 110 . That is, in response to detection of separation of the finger F from the sensor face 118 moving from the capturing position toward the recessed position, the sensor drive unit 3114 moves the image sensor 108 and the sensor cover 110 including the sensor face 118 toward the capturing position.
  • the separation of the finger F from the sensor face 118 can be detected in a similar manner to the first example embodiment.
  • the present example embodiment can be also configured such that, in a similar manner to the first example embodiment, another press of the motion switch 142 causes the image sensor 108 and the sensor cover 110 including the sensor face 118 moving from the capturing position toward the recessed position to change the moving direction and move from the recessed position toward the capturing position.
  • the sensor face 118 once separates from the ball of the finger F at the recessed position. Subsequently, the sensor face 118 again comes into contact with the ball of the finger F at the capturing position recovered from the recessed position. Thereby, also in the present example embodiment, elastic deformation of the finger F generated at the first contact to the sensor face 118 can be reduced or even removed. Therefore, according to the present example embodiment, even when reading a fingerprint of the finger F which is relatively soft and may be easily elastically deformed, it is possible to appropriately read the fingerprint and acquire a high quality fingerprint image.
  • the edge parts 128 and parts of the protrusion parts 126 in the light guiding parts 124 support the finger F from the sensor face 118 side. Therefore, according to the present example embodiment, although the sensor face 118 once separates from the ball of the finger F, displacement of the finger F can be suppressed, and therefore the fingerprint of the finger F can be read more appropriately, and a higher quality fingerprint image can be acquired.
  • a fingerprint reading device and a fingerprint reading method according to a fourth example embodiment of the present invention will be described by using FIG. 18 .
  • the basic configuration of the fingerprint reading device according to the present example embodiment is substantially the same as the configuration of the fingerprint reading device 10 according to the first example embodiment described above.
  • the fingerprint reading device according to the present example embodiment is different from the fingerprint reading device 10 according to the first example embodiment in the shape of light guiding parts in the side light sources 112 .
  • FIG. 18 is a plan view illustrating the fingerprint reading device according to the present example embodiment, which illustrates a plane corresponding to the plane of the fingerprint reading device 10 according to the first example embodiment illustrated in FIG. 2 .
  • each of the pair of side light sources 112 has a light guiding part 4124 instead of the light guiding part 124 according to the first example embodiment.
  • the light-transmitting material of the light guiding parts 4124 is the same as that of the light guiding parts 124 according to the first example embodiment.
  • the light guiding part 4124 in each side light source 112 is formed extending in the front-rear direction of the placement portion 102 in a similar manner to the light guiding part 124 according to the first example embodiment.
  • the light guiding part 4124 has a ridge-like protrusion part 4126 and a skirt-like edge part 4128 .
  • the protrusion part 4126 is the same as the protrusion part 126 according to the first example embodiment.
  • the edge part 4128 is formed in a skirt-like manner integrally with the protrusion part 4126 so as to extend on the sensor face 118 side of the protrusion part 4126 continuously from the protrusion part 4126 on the sensor face 118 side in a similar manner to the edge part 128 according to the first example embodiment.
  • the edge part 4128 has a lower height in the perpendicular direction of the placement portion 102 than the protrusion part 4126 , and the height thereof gradually decreases toward the sensor face 118 side.
  • a part of the protrusion part 4126 on the edge part 4128 side and the edge part 4128 are located protruding over the end of the sensor face 118 in the same manner as in the first example embodiment.
  • the edge part 4128 has a portion whose protruding width, which is a width located over the end of the sensor face 118 , is not constant. Specifically, in the front side part of the placement portion 102 , the edge part 4128 has an increasing protruding width thereof toward the front side of the placement portion 102 in the front-rear direction of the placement portion 102 . Thus, the spacing between the edge part 4128 of one of the side light sources 112 and the edge part 4128 of the other side light source 112 is narrower toward the front side of the placement portion 102 in the front-rear direction of the placement portion 102 .
  • the fingerprint reading device 4010 with a portion having wider protruding widths of the edge parts 4128 in the front side part of the placement portion 102 as described above, it is possible to more tightly support a finger whose fingerprint is to be read from the sensor face 118 side. Thus, according to the present example embodiment, it is possible to further ensure to suppress displacement of a finger whose fingerprint is to be read. Further, the portion having a wider protruding width of the edge part 4128 is located in the front side part of the placement portion 102 and thus does not prevent capturing of a fingerprint performed by the image sensor 108 . Therefore, according to the present example embodiment, the fingerprint can be read more appropriately, and a higher quality fingerprint image can be acquired.
  • the tip part of a finger has a more feature amount of a fingerprint than the root part of the finger.
  • the edge parts 4128 corresponding to the root part of a finger is present, since a part corresponding to the tip part of the finger is opened, the tip part of the finger is able to come into contact with the sensor face 118 , and a fingerprint image can be acquired.
  • the light guiding parts 4124 may be provided instead of the light guiding part 124 also in the second and third example embodiments.
  • a fingerprint reading device and a fingerprint reading method according to a fifth example embodiment of the present invention will be described by using FIG. 19 .
  • the basic configuration of the fingerprint reading device according to the present example embodiment is substantially the same as the configuration of the fingerprint reading device 10 according to the first example embodiment described above.
  • the fingerprint reading device according to the present example embodiment is different from the fingerprint reading device 10 according to the first example embodiment in the shape of light guiding parts in the side light sources 112 .
  • FIG. 19 is a plan view illustrating the fingerprint reading device according to the present example embodiment, which illustrates a plane corresponding to the plane of the fingerprint reading device 10 according to the first example embodiment illustrated in FIG. 2 .
  • each of the pair of side light sources 112 has a light guiding part 5124 instead of the light guiding part 124 according to the first example embodiment.
  • the light-transmitting material of the light guiding parts 5124 is the same as that of the light guiding parts 124 according to the first example embodiment.
  • the light guiding part 5124 in each side light source 112 is formed extending in the front-rear direction of the placement portion 102 in a similar manner to the light guiding part 124 according to the first example embodiment.
  • the light guiding part 5124 has a ridge-like protrusion part 5126 and a skirt-like edge part 5128 .
  • the protrusion part 5126 is the same as the protrusion part 126 according to the first example embodiment.
  • the edge part 5128 is formed in a skirt-like manner integrally with the protrusion part 5126 so as to extend on the sensor face 118 side of the protrusion part 5126 continuously from the protrusion part 5126 on the sensor face 118 side in a similar manner to the edge part 128 according to the first example embodiment.
  • the edge part 5128 has a lower height in the perpendicular direction of the placement portion 102 than the protrusion part 5126 , and the height thereof gradually decreases toward the sensor face 118 side.
  • a part of the protrusion part 5126 on the edge part 5128 side and the edge part 5128 are located protruding over the end of the sensor face 118 in the same manner as in the first example embodiment.
  • the edge part 5128 of one of the side light sources 112 and the edge part 5128 of the other side light source 112 are formed to extend across the sensor face 118 and be continuous to each other across the sensor face 118 .
  • the same light shielding parts 130 as those in the first example embodiment are formed on the underside of the edge parts 5128 extending over the sensor face 118 .
  • An opening 5130 that exposes the sensor face 118 is formed in the center part of the edge parts 5128 extending across the sensor face 118 .
  • the opening 5130 is formed such that a part of the sensor face 118 of the shape and the area by which a fingerprint can be read is exposed when the image sensor 108 and the sensor cover 110 are positioned at the capturing position.
  • the planar shape of the opening 5130 is not particularly limited but may be an ellipse or a shape of a fingertip, for example.
  • the fingerprint reading device 5010 with a portion other than the opening 5130 of the edge parts 5128 extending across the sensor face 118 as described above, it is possible to more tightly support a finger whose fingerprint is to be read from the sensor face 118 side. Thus, according to the present example embodiment, it is possible to further ensure to suppress displacement of a finger whose fingerprint is to be read. Further, since the image sensor 108 is able to capture a fingerprint through the opening 5130 , capturing of a fingerprint performed by the image sensor 108 is not prevented. Therefore, according to the present example embodiment, the fingerprint can be read more appropriately, and a higher quality fingerprint image can be acquired.
  • the edge parts 5128 corresponding to the root part of a finger is present, since a part corresponding to the tip part of a finger having a large feature amount of the fingerprint is opened, the tip part of the finger is able to come into contact with the sensor face 118 , and a fingerprint image can be acquired.
  • the light guiding parts 5124 may be provided instead of the light guiding part 124 also in the second and third example embodiments.
  • a fingerprint reading device and a fingerprint reading method according to a sixth example embodiment of the present invention will be described by using FIG. 20 .
  • a subject is not limited to a newborn, an infant, and a young child.
  • the fingerprint reading device can be applied to persons of any age group as a subject in addition to a newborn, an infant, and a young child.
  • the fingerprint reading device is applied not only to a newborn, an infant, and a young child but also to persons other than a newborn, an infant, and a young child as a subject.
  • persons other than a newborn, an infant, and a young child include an adult and a minor other than a newborn, an infant, and a young child.
  • a newborn, an infant, and a young child are denoted as “newborn or the like”, and persons other than a newborn, an infant, and a young child are denoted as “adult or the like”.
  • the basic configuration of the fingerprint reading device according to the present example embodiment that is applied to a newborn or the like and an adult or the like as a subject is substantially the same as the configuration of the fingerprint reading device 10 according to the first example embodiment. Since the fingerprint reading device according to the present example embodiment is different from the fingerprint reading device 10 according to the first example embodiment in the shape of light guiding parts in the side light sources 112 because an adult or the like may also be a subject.
  • FIG. 20 is a transverse sectional view illustrating a fingerprint reading device according to the present example embodiment, which illustrates a horizontal cross section corresponding to the horizontal cross section of the fingerprint reading device 10 according to the first example embodiment illustrated in FIG. 4 .
  • the light guiding parts 124 according to the first example embodiment are illustrated by one-dot-chain lines for the purpose of comparison.
  • each of the pair of side light sources 112 has a light guiding part 6124 instead of the light guiding part 124 according to the first example embodiment.
  • the light-transmitting material of the light guiding parts 6124 is the same as that of the light guiding parts 124 according to the first example embodiment.
  • the light guiding part 6124 in each of the side light sources 112 is formed extending in the front-rear direction of the placement portion 102 in a similar manner to the light guiding part 124 according to the first example embodiment.
  • the light guiding part 6124 has a ridge-like protrusion part 6126 and a skirt-like edge part 6128 .
  • the protrusion part 6126 is formed in a ridge-like manner so as to cover the plurality of near-infrared LEDs 122 and protrude above the top face of the casing 106 in a similar manner to the protrusion part 126 according to the first example embodiment. Unlike the protrusion part 126 according to the first example embodiment, however, the protrusion part 6126 is formed to neither protrude over the end of the sensor face 118 nor be located over the end of the sensor face 118 .
  • the edge part 6128 is formed in a skirt-like manner integrally with the protrusion part 6126 so as to extend on the sensor face 118 side of the protrusion part 6126 continuously from the protrusion part 6126 on the sensor face 118 side in a similar manner to the edge part 128 according to the first example embodiment.
  • the edge part 6128 has a lower height in the perpendicular direction of the placement portion 102 than the protrusion part 6126 , and the height thereof gradually decreases toward the sensor face 118 side.
  • a part of the edge part 6128 is located protruding over the end of the sensor face 118 .
  • Each light shielding part 130 is provided on the underside of the sensor face 118 of a part of the edge parts 6128 , which is a portion located protruding over the end of the sensor face 118 of the light guiding part 124 in a similar manner to the first example embodiment.
  • the protruding width which is a width located over the end of the sensor face 118 that is a protruding part of the edge part 6128 can be appropriately set to be able to read not only a finger of a newborn or the like but also a fingerprint of an adult or the like.
  • the protrusion part 6126 does not protrude over the end of the sensor face 118 , and only a part of the edge part 6128 of the light guiding part 6124 is protruded and located over the end of the sensor face 118 .
  • a finger of an adult or the like that is larger than a finger of a newborn or the like can come into contact with the sensor face 118 .
  • not only a fingerprint of a newborn or the like but also a fingerprint of an adult or the like can be read in a similar manner to the first example embodiment.
  • the subject of the adult or the like when a fingerprint of an adult or the like as a subject is read, the subject of the adult or the like is able to operate the fingerprint reading device 6010 by himself/herself to have the fingerprint of his/her own finger read. In such a case, the subject is able to cause the ball of a finger whose fingerprint is to be captured to come into contact with the sensor face 118 of the sensor cover 110 while holding the holding portion 104 by a hand opposite to the hand including a finger whose fingerprint is to be captured.
  • the subject is able to hold the holding portion 104 from the sides such that, out of fingers holding the holding portion 104 , the thumb is located on the top plate side of the casing 106 and four fingers of the hand other than the thumb are located on the bottom plate side of the casing 106 , for example.
  • the subject of an adult or the like holding the holding portion 104 is able to press the motion switch 142 and the capture switch 144 by using any of the four fingers located on the bottom plate side of the casing 106 out of the fingers of the hand holding the holding portion 104 while holding the holding portion 104 .
  • a fingerprint of the subject can be read in a similar manner to the first example embodiment.
  • the finger may be significantly elastically deformed due to influence of a moisture state, a high water-retention capability, a high moisture percentage, or the like, for example.
  • the fingerprint can be read more appropriately, and a higher quality fingerprint image can be acquired.
  • the fingerprint of the subject can be read in the same manner as the first example embodiment.
  • the light guiding parts 6124 may be provided instead of the light guiding part 124 also in the second and third example embodiments.
  • the light guiding parts 4124 or 5124 can be formed such that the protrusion parts 4126 or 5126 are not located over the end of the sensor face 118 in a similar manner to the present example embodiment.
  • a fingerprint reading device and a fingerprint reading method according to a seventh example embodiment of the present invention will be described by using FIG. 21 .
  • the same components as those in the fingerprint reading device and the fingerprint reading method according to the first to sixth example embodiments described above are labeled with the same references, and the description thereof will be omitted or simplified.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are provided so as to swing by using the hinge part 120 so as to swing by using the hinge part 120 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 may be fixed and provided to the placement portion 102 in the casing 106 so as to be positioned at the capturing position.
  • the basic configuration of the fingerprint reading device according to the present example embodiment is substantially the same as the fingerprint reading device 10 according to the first example embodiment.
  • the fingerprint reading device according to the present example embodiment is different from the fingerprint reading device 10 according to the first example embodiment in that the image sensor 108 and the sensor cover 110 including the sensor face 118 are fixed and that the sensor drive unit 114 is not provided accordingly.
  • FIG. 21 is a longitudinal sectional view illustrating the fingerprint reading device according to the present example embodiment and illustrates a vertical cross section corresponding to the vertical cross section of the fingerprint reading device 10 according to the first example embodiment illustrated in FIG. 3 .
  • the hinge part 120 is not used in a fingerprint reading device 7010 according to the present example embodiment, and the image sensor 108 is fixed to the placement portion 102 in the casing 106 via a fixing member 7116 , for example.
  • the fixing member 7116 fixes the image sensor 108 to the bottom inside the placement portion 102 .
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 fixed to the placement portion 102 are positioned at same the capturing position as that in the first example embodiment.
  • the scheme of fixing the image sensor 108 and the sensor cover 110 including the sensor face 118 is not particularly limited, various schemes may be used for fixing.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 are fixed and provided to the placement portion 102 so as to be positioned at the capturing position. Note that, since the image sensor 108 and the sensor cover 110 are fixed, the sensor drive unit 114 is not provided in the present example embodiment.
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 may be fixed and provided to the placement portion 102 so as to be positioned at the capturing position.
  • a fingerprint reading device and a fingerprint reading method according to an eighth example embodiment of the present invention will be described by using FIG. 22 .
  • reading of a fingerprint can be automatically performed.
  • a case where reading of a fingerprint is automatically performed will be described in the first example embodiment.
  • the image processing apparatus 20 in the fingerprint reading system 1 is configured to automate reading of a fingerprint performed by the fingerprint reading device 10 .
  • the image processing apparatus 20 and the fingerprint reading device 10 are formed as described below.
  • the CPU 202 functions as a control unit that controls the operation of the fingerprint reading device 10 including the sensor drive unit 114 and the image sensor 108 and automates reading of a fingerprint performed by the fingerprint reading device 10 .
  • the CPU 202 In response to a read instruction signal that is an instruction to read a fingerprint, the CPU 202 outputs a control signal used for controlling the fingerprint reading device 10 and inputs the control signal to the fingerprint reading device 10 via the communication cable 30 .
  • the control signal is a signal used for automating reading of a fingerprint performed by the fingerprint reading device 10 .
  • the control signal includes a drive instruction signal that is an instruction to drive the image sensor 108 and the sensor cover 110 and a capture instruction signal that is an instruction to capture a fingerprint after driving the image sensor 108 and the sensor cover 110
  • the fingerprint reading device 10 and the image processing apparatus 20 can be configured such that, in response to the user pressing the capture switch 144 , for example, the read instruction signal that is an instruction to read a fingerprint described above is input to the image processing apparatus 20 via the fingerprint reading device 10 . Further, the image processing apparatus 20 may be configured such that, in response to the user operating the input device 218 , the read instruction signal that is an instruction to read a fingerprint described above is input.
  • the CPU 202 functions as a determination unit that determines the quality of a fingerprint image transferred from the fingerprint reading device 10 .
  • the CPU 202 determines the quality of the fingerprint image transferred from the fingerprint reading device 10 based on a criterion regarding the fingerprint image quality.
  • the CPU 202 determines that the quality of the fingerprint image is good if the quality of the fingerprint image is higher than or equal to a predetermined quality and determines that the quality of the fingerprint image is not good if the quality of the fingerprint image is lower than the predetermined quality.
  • the CPU 202 determines that the quality of the fingerprint image is not good, the CPU 202 again outputs a control signal including a drive instruction signal and a capture instruction signal described above and inputs the control signal to the fingerprint reading device 10 .
  • the CPU 202 functions as a control unit that controls the operation of the sensor drive unit 114 in accordance with the drive instruction signal based on the determination result on the quality of the fingerprint image and controls the operation of the image sensor 108 in accordance with the capture instruction signal.
  • the CPU 166 drives the sensor drive unit 114 and the image sensor 108 based on the control signal input from the image processing apparatus 20 . Specifically, the CPU 166 drives the sensor drive unit 114 in accordance with the drive instruction signal that is an instruction to drive the image sensor 108 and the sensor cover 110 included in the control signal. Thereby, the image sensor 108 and the sensor cover 110 including the sensor face 118 move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position in the same manner as in the first example embodiment.
  • the CPU 166 causes the image sensor 108 to capture and read a fingerprint with the side light sources 112 being turned on in the same manner as in the first example embodiment in accordance with the capture instruction signal included in the control signal, which is an instruction to capture a fingerprint after driving the image sensor 108 and the sensor cover 110 .
  • FIG. 22 is a flowchart illustrating the operation of the fingerprint reading device and the image processing apparatus according to the present example embodiment.
  • the user causes the ball of a finger of a subject to come into contact with the sensor face 118 of the fingerprint reading device 10 in a state where the image sensor 108 and the sensor cover 110 including the sensor face 118 are positioned at the capturing position (step S 102 ).
  • the user inputs, to the image processing apparatus 20 , a read instruction signal that is an instruction to read a fingerprint by using the input device 218 , for example (step S 202 ).
  • the CPU 202 of the image processing apparatus 20 outputs a control signal that controls the fingerprint reading device 10 and inputs the control signal to the fingerprint reading device 10 in accordance with the fingerprint reading signal input by the user (step S 204 ).
  • the control signal includes a drive instruction signal that is an instruction to drive the image sensor 108 and the sensor cover 110 and a capture instruction signal that is an instruction to capture a fingerprint after driving the image sensor 108 and the sensor cover 110 .
  • the drive instruction signal and the capture instruction signal may be input to the fingerprint reading device 10 in the same manner as described above before the read instruction signal is input by the user in response to detection of contact the ball of the finger with the sensor face 118 .
  • the CPU 166 of the fingerprint reading device 10 drives the sensor drive unit 114 as described below based on the control signal input from the image processing apparatus 20 and then causes the image sensor 108 to capture a fingerprint (steps S 104 and S 106 ).
  • the CPU 166 drives the sensor drive unit 114 in accordance with the drive instruction signal included in the control signal input from the image processing apparatus 20 (step S 104 ).
  • the image sensor 108 and the sensor cover 110 including the sensor face 118 move from the capturing position to the recessed position and further move and return from the recessed position to the capturing position in the same manner as in the first example embodiment.
  • the same trigger as that in the first example embodiment can be used as a trigger by which the rear end part of the image sensor 108 and the sensor cover 110 is switched from moving down to moving up.
  • the CPU 166 causes the image sensor 108 to capture and read a fingerprint with the side light source 112 being turned on in the same manner as in the first example embodiment in accordance with the capture instruction signal included in the control signal input from the image processing apparatus 20 (step S 106 ).
  • image data of the fingerprint image captured by the image sensor 108 is transferred to the image processing apparatus 20 via the communication cable 30 (step S 108 ).
  • predetermined image processing is performed on the image data of the fingerprint image transferred to the image processing apparatus 20 .
  • the CPU 202 of the image processing apparatus 20 determines based on a criterion regarding the fingerprint image quality whether or not the quality of the fingerprint image transferred from the fingerprint reading device 10 is good (step S 206 ).
  • step S 206 determines that the quality of the fingerprint image is good (step S 206 , YES)
  • the CPU 202 performs display, recording, or the like of the fingerprint image in the same manner as in the first example embodiment (step S 208 ).
  • step S 206 determines that the quality of the fingerprint image is not good (step S 206 , NO)
  • the CPU 202 proceeds to step S 204 , again outputs a control signal including a drive instruction signal and a capture instruction signal described above, and again inputs the control signal to the fingerprint reading device 10 .
  • the CPU 202 may perform display or the like on the fingerprint image determined to be not good in the same manner as in the first example embodiment.
  • the CPU 166 of the fingerprint reading device 10 to which the control signal is again input from the image processing apparatus 20 again performs steps S 104 , S 106 , and S 108 . Thereby, the image data of the fingerprint image re-acquired in the fingerprint reading device 10 is again transferred to the image processing apparatus 20 .
  • step S 104 of driving the sensor drive unit 114 being executed again reduction or removal of elastic deformation of a finger that is a factor of reduction in quality of a fingerprint image is attempted.
  • the CPU 202 of the image processing apparatus 20 to which the image data of the fingerprint image is again transferred executes step S 206 again.
  • reading of the fingerprint performed by the fingerprint reading device 10 is repeated until a fingerprint image having a quality of a predetermined value or higher is acquired.
  • the image processing apparatus 20 controls the fingerprint reading device 10 to automatically read a fingerprint. Furthermore, in the present example embodiment, reading of a fingerprint performed by the fingerprint reading device 10 is repeated until a fingerprint image having a quality of a predetermined value or higher is acquired based on a result of the fingerprint image quality determined by the image processing apparatus 20 . Therefore, according to the present example embodiment, a high quality fingerprint image can be efficiently acquired.
  • the example embodiment is not limited thereto.
  • the CPU 166 of the control circuit 116 of the fingerprint reading device 10 may function as the whole or a part of the determination unit and the control unit that automate reading of a fingerprint performed by the fingerprint reading device 10 in a similar manner to the CPU 202 of the image processing apparatus 20 described above.
  • reading of a fingerprint can be automated in the second to seventh example embodiments in the same manner as described above.
  • FIG. 23 is a block diagram illustrating a function configuration of the fingerprint reading device according to another example embodiment.
  • a fingerprint reading device 8000 has a placement portion 8002 on which a finger is placed and a reading face 8004 with which the finger placed on the placement portion 8002 contacts. Further, the fingerprint reading device 8000 has a pair of light sources 8006 that are provided on the placement portion 8002 and irradiate a finger placed on the placement portion 8002 with lights. Furthermore, the fingerprint reading device 8000 has a reading unit 8008 that captures and reads a fingerprint of a finger in contact with the reading face 8004 in accordance with lights scattered in the finger and emitted from the surface of the finger. The pair of the light sources 8006 are provided on both ends of the sensor face 8004 that are opposed to each other in the width direction of the placement portion 8002 . Further, each of the pair of light sources 8006 has a light guiding part 8010 formed in the front-rear direction of the placement portion 8002 . The light guiding part 8010 is formed so as to extend up to above the end of the reading face 8004 .
  • the fingerprint reading device 8000 it is possible to suppress the position of a finger whose fingerprint is to be read from being shifted with respect to a reading face.
  • the reading unit is not limited thereto.
  • various types such as an electrostatic capacitor type, an electric filed intensity type, or the like other than the optical type can be used.
  • the invention is not limited thereto. Any configuration is possible as long as at least the sensor face 118 is driven as described in the example embodiments described above, and the image sensor 108 or other reading units that can read a fingerprint of a finger in contact with the sensor face 118 located in the capturing position may be fixed at a position separated from the sensor face 118 .
  • a fingerprint reading device comprising:
  • a reading unit that captures and reads a fingerprint of the finger in contact with the reading face in accordance with lights scattered in the finger and emitted from a surface of the finger
  • the pair of light sources are provided on both ends of the reading face that are opposed to each other in a width direction of the placement portion and
  • the light guiding parts are formed so as to extend up to above the ends of the reading face.
  • the fingerprint reading device according to supplementary note 1, wherein the light guiding parts are configured to be able to support the finger placed on the placement portion.
  • the fingerprint reading device according to supplementary note 1 or 2, wherein the pair of light sources are inclined inward above the reading face.
  • the fingerprint reading device according to any one of supplementary notes 1 to 3,
  • each of the pair of light sources has a plurality of unit light sources arranged extending in the front-rear direction of the placement portion, and
  • each of the light guiding parts is formed to cover the plurality of unit light sources.
  • the fingerprint reading device according to supplementary note 5, wherein the edge part and a part of the protrusion part are located over the end of the reading face.
  • the fingerprint reading device according to supplementary note 5, wherein a part of the edge part is located over the end of the reading face.
  • the fingerprint reading device according to any one of supplementary notes 5 to 7,
  • a width of the edge part located over the end of the reading face is wider toward a front side of the placement portion.
  • the fingerprint reading device according to any one of supplementary notes 5 to 7,
  • edge part of the light guiding part for one of the pair of light sources and the edge part of the light guiding part for the other of the pair of light sources are formed to be continuous to each other above the reading face
  • the fingerprint reading device according to any one of supplementary notes 1 to 9 further comprising a light shielding part formed on an underside of the light guiding parts in a portion located on the ends of the reading face.

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US20210145324A1 (en) 2021-05-20
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US11806132B2 (en) 2023-11-07
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JP2023181304A (ja) 2023-12-21
US20220409099A1 (en) 2022-12-29

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