Classifications

• • A—HUMAN NECESSITIES
  • A44—HABERDASHERY; JEWELLERY
  • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
  • A44C9/00—Finger-rings
  • A44C9/0053—Finger-rings having special functions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
  • A61B5/0077—Devices for viewing the surface of the body, e.g. camera, magnifying lens
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
  • A61B5/02007—Evaluating blood vessel condition, e.g. elasticity, compliance
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
  • A61B5/024—Measuring pulse rate or heart rate
  • A61B5/02416—Measuring pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
  • A61B5/02427—Details of sensor
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
  • A61B5/024—Measuring pulse rate or heart rate
  • A61B5/02416—Measuring pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
  • A61B5/02427—Details of sensor
  • A61B5/02433—Details of sensor for infrared radiation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
  • A61B5/024—Measuring pulse rate or heart rate
  • A61B5/02438—Measuring pulse rate or heart rate with portable devices, e.g. worn by the patient
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
  • A61B5/026—Measuring blood flow
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
  • A61B5/026—Measuring blood flow
  • A61B5/0261—Measuring blood flow using optical means, e.g. infrared light
• • 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
• • 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue
  • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
  • A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration or pH-value ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid or cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
  • A61B5/14552—Details of sensors specially adapted therefor
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/6802—Sensor mounted on worn items
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/6813—Specially adapted to be attached to a specific body part
  • A61B5/6825—Hand
  • A61B5/6826—Finger
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/683—Means for maintaining contact with the body
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
  • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
  • G06F21/31—User authentication
  • G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
  • G06V10/00—Arrangements for image or video recognition or understanding
  • G06V10/10—Image acquisition
  • G06V10/12—Details of acquisition arrangements; Constructional details thereof
  • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
  • G06V10/143—Sensing or illuminating at different wavelengths
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
  • G06V10/00—Arrangements for image or video recognition or understanding
  • G06V10/10—Image acquisition
  • G06V10/12—Details of acquisition arrangements; Constructional details thereof
  • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
  • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; 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
  • G06V40/15—Biometric patterns based on physiological signals, e.g. heartbeat, blood flow
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
  • A61B2560/02—Operational features
  • A61B2560/0204—Operational features of power management
  • A61B2560/0214—Operational features of power management of power generation or supply

Definitions

• This invention relates to a blood flow authentication ring that incorporates a blood flow imaging function in a ring-shaped component and performs blood flow imaging and identity authentication while worn on a finger.
• a method that has been proposed to authenticate individuals using biometric information is to use a blood flow reading ring to read blood flow.
• JP 2003-093368 A Japanese Patent No. 4432539
• Patent Documents 1 and 2 have the disadvantage that the distance from the imaging surface to the subject (the finger surface on which the blood flow is projected) varies depending on the size of the finger, resulting in an image that is out of focus.
• Patent Documents 1 and 2 also use a method of irradiating infrared light or the like and capturing an image of the reflected light, but this method has the disadvantage that the infrared irradiation light is reflected on the inner circumference of the ring, and stray light from external light is reflected on the inner circumference of the ring, making the image background brighter and reducing the contrast of the blood flow.
• the owner of the blood flow reading ring must register himself/herself in advance before blood flow authentication is performed. To register himself/herself, for example, a button mounted on the blood flow reading ring must be pressed to perform a series of registration operations, but there are problems such as the registration operation being complicated and the ring size being restricted by the placement of the button for registration.
• the object of the present invention is to provide a blood flow authentication ring that can focus a captured image regardless of the size of the finger, can prevent a decrease in contrast due to external light, and allows for easy personal registration.
• the blood flow authentication ring of the first aspect of the present invention has a ring-shaped cover member that is worn on a finger and performs authentication based on the blood flow in the finger.
• the cover member is provided with at least an irradiation device that irradiates light onto the finger and an imaging device that images the light that has passed through the finger.
• An adjustment member is provided between the inner circumference of the cover member and the finger, and the adjustment member has at least one of the functions of a size correction member and a low-reflection member, and is characterized in that the adjustment member is disposed at least between the inner circumference side of the cover member and the back side of the finger.
• the second aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the dynamic friction coefficient of the surface of the adjustment member is less than 0.2.
• the third aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the cover member is provided with a solar panel.
• the fourth aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the light emitted by the irradiation device is at least one of near-infrared light and red light.
• the fifth aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the adjustment member has the function of a low reflection member, and the low reflection member has a reflectance of less than 10%.
• the blood flow authentication ring of the sixth aspect of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the adjustment member is disposed at least between the inner circumference of the cover member and the back side of the finger and both sides of the finger.
• the seventh aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the adjustment member is an elastic member.
• the eighth aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, the adjustment member is provided with a light passing portion that passes the light irradiated from the irradiation device.
• the ninth aspect of the blood flow authentication ring of the present invention is characterized in that in the blood flow authentication ring of the first aspect, at least one of the irradiation device and the imaging device is provided in multiple units.
• the blood flow authentication ring of the tenth aspect of the present invention has a ring-shaped cover member that is worn on a finger and performs authentication based on the blood flow in the finger.
• the cover member is provided with at least an irradiation device that irradiates the finger with light and an imaging device that captures the light that has passed through the finger.
• the cover member is further provided with finger detection means that detects that the cover member is worn on the finger, and has a registration function that automatically performs personal authentication registration corresponding to the finger when the finger detection means detects that the cover member is worn on the finger for the first time.
• an adjustment member is provided between the inner circumference of the cover member and the finger, and the adjustment member has at least one of the functions of a size correction member and a low reflection member.
• the adjustment member is disposed at least between the inner circumference side of the cover member and the back side of the finger, so that the size correction member acts as a spacer in the space between the cover member and the finger, making it possible to focus the captured image regardless of the size of the finger, and preventing a decrease in contrast due to external light.
• the function of the low reflection member reliably solves the problem that stray light due to external light is reflected toward the inner circumference side of the ring, making the image background bright and reducing the contrast of the blood flow.
• the dynamic friction coefficient of the surface of the adjustment member is less than 0.2, and this surface treatment reduces the risk of the finger getting caught when inserted, allowing for smooth insertion and removal. Furthermore, by increasing the sliding properties of the surface member, durability against repeated insertion and removal can be improved.
• a solar panel is provided on the cover member, and the power generated by the solar panel can be used to charge a capacitor, a storage battery, etc., making it possible to provide a blood flow authentication ring that does not require a power source. Note that if power is supplied from an external source to charge the storage battery, it is also possible to configure the ring without the solar panel.
• near-infrared light and red light are used, and since red wavelengths, along with near-infrared wavelengths, have the characteristic of being easily absorbed by blood flow, near-infrared light or red light is not detected only in the portion of the captured image where blood flow is present, so it is possible to capture the blood flow with high accuracy.
• the near-infrared light and red light can be irradiated by LEDs, As the irradiation device, a near-infrared LED or a red LED can be used.
• the adjustment member functions as a low reflection member, and the low reflection member has a reflectance of less than 10%.
• a sheet-like material with a reflectance of less than 10% from 850 nm to 950 nm can be used as the surface member for the low reflection member.
• the surface of the adjustment member low reflectance, reflections on the inner circumference side of the ring caused by near-infrared light irradiation or stray light from external light are also suppressed, resulting in an effect of obtaining a high-contrast blood flow image.
• the same effect can be obtained by applying the same low reflection treatment to the inside of the cover member.
• the adjustment member acts as a spacer in the space between the cover member and the finger, at least between the inner circumference of the cover member and the back and both sides of the finger, making it possible to focus the captured image regardless of the size of the finger and preventing a decrease in contrast due to external light.
• the function of the low-reflection member reliably solves the problem that stray light from external light is reflected toward the inner circumference of the ring, brightening the image background and reducing the contrast of the blood flow.
• the adjustment member is an elastic member, and the amount of deflection of the elastic member changes depending on the thickness of the finger.
• the elasticity of the size correction member allows the finger to be fitted without gaps while absorbing differences in finger thickness, and the finger is biased in the direction from the dorsal side to the ventral side (the direction from the irradiation device to the imaging device, downward). This keeps the distance X from the imaging position of the camera module to the surface of the finger constant, regardless of the size of the finger.
• the adjustment member is provided with a light passing section that passes the light irradiated from the irradiation device, and therefore by providing a through hole in the adjustment member, for example, in a portion of the size correction member corresponding to the LED arrangement position, the light (irradiation light flux) irradiated from the LED passes through the through hole and is appropriately irradiated to the inner circumference side of the size correction member.
• the adjustment member by providing the adjustment member with a light passing section that passes the light irradiated from the irradiation device, it is possible to achieve the effect of the adjustment member of the first aspect, and further reliably prevent the light (irradiation light flux) irradiated from the LED from being blocked.
• At least one of the irradiation device and the imaging device is provided in multiple units.
• the amount of light can be increased and the irradiation range can be expanded.
• multiple camera modules it becomes possible to capture images over a wide range.
• LEDs of multiple specifications for example, by combining at least one red LED and a near-infrared LED, a clearer blood flow image can be obtained.
• the cover member is further provided with finger detection means for detecting the ring being worn on the finger, and has a registration function for automatically performing personal authentication registration corresponding to the finger when the finger detection means detects the ring being worn on the finger for the first time, so that the first time the ring is worn on the finger, the ring can be detected and the personal information can be automatically registered. Furthermore, it is possible to obtain a blood flow authentication ring that can be easily operated without any special operations and that does not impose restrictions on ring size. This makes it possible to provide a blood flow authentication ring that allows for easy personal registration.
• FIG. 2 is a perspective view of the blood flow authentication ring of the first embodiment.
• FIG. 2 is an exploded perspective view of the blood flow authentication ring of the first embodiment.
• 1 is a vertical cross-sectional view of an example in which one near-infrared LED (or one red LED) and one camera module of the first embodiment are mounted.
• FIG. 1 is a vertical cross-sectional view of a first modified example in which a plurality of near-infrared LEDs (or red LEDs) and a plurality of camera modules are mounted according to the first embodiment.
• FIG. FIG. 2 is another vertical cross-sectional view showing the first embodiment of the invention according to this application.
• 1A and 1B are diagrams showing the structure of a size correction member according to the present invention.
• FIG. 1 is a diagram showing a direction in which a force is applied due to bending of a size correction member of the invention related to this application.
• FIG. 1 is a diagram showing, in vertical section, the relative positions of a finger and the blood flow authentication ring of the present application when a person with a relatively thick finger of embodiment 1 wears the blood flow authentication ring.
• FIG. 1 is a diagram showing, in vertical section, the relative positions of a finger and the blood flow authentication ring of the present application when the blood flow authentication ring of embodiment 1 is worn by a person with relatively thin fingers.
• FIG. FIG. 4 is a diagram illustrating an authentication decision according to the first embodiment.
• FIG. 2 is a perspective view showing unlocking and locking of the door in the first embodiment.
• FIG. 4 is a flowchart showing the process of locking and unlocking a door in the first embodiment.
• FIG. 11 is a vertical cross-sectional view of a second embodiment with a vital sensor and NFC added.
• FIG. 2 is an enlarged view of the arrangement of the NFC antenna flex and the solar panel according to the invention of this application.
• 1 is a flowchart showing the process from inserting a finger into the blood flow authentication ring of the invention related to this application to processing of payment.
• a blood flow authentication ring according to an embodiment of the present invention will be described in detail with reference to the drawings.
• the embodiments shown below are examples of blood flow authentication rings to embody the technical ideas of the present invention, and are not intended to limit the present invention to these, but may be equally applicable to other embodiments included in the scope of the claims.
• a blood flow authentication ring worn on a finger is shown as a specific example, but this is merely one example, and the blood flow authentication ring of this embodiment is not limited to being worn on a finger, but may be applied to any part of the body as long as blood flow can be recognized.
• FIGS. Fig. 1 is a perspective view showing this embodiment. This figure shows a person who owns a blood flow authentication ring 2 wearing the blood flow authentication ring on his or her finger.
• Fig. 2 is an exploded perspective view showing this embodiment.
• Fig. 3 is a vertical cross-sectional view showing this embodiment.
• Fig. 4 is a vertical cross-sectional view showing this embodiment.
• the exterior of the blood flow authentication ring 2 is made up of two cases, a front and a back, which are a first case 3 and a second case 4.
• the first case 3 and the second case 4 are fixed to each other, for example, by adhesive, laser welding, or screw fastening.
• 5 is an LED as a "near-infrared light irradiation means", and is, for example, a near-infrared LED that irradiates near-infrared light of 850 nm to 950 nm, or a red LED that irradiates red light of 600 nm to 700 nm.
• FIG. 3A is a vertical cross-sectional view of an embodiment of the present invention that is equipped with one LED 5 (near-infrared LED or red LED) and one camera module 12.
• the blood flow authentication ring 22 of this embodiment is an embodiment in which one LED 5 (near-infrared LED or red LED) is arranged.
• FIG. 3B is a vertical cross-sectional view of an example of Variation 1 of this embodiment, in which multiple LEDs 5 (near-infrared LEDs or red LEDs) and camera modules 12 are installed.
• Variation 1 is an example in which multiple LEDs 5 (near-infrared LEDs or red LEDs) are arranged to increase the amount of light and expand the irradiation range.
• red LEDs When red LEDs are used, red wavelengths, along with near-infrared wavelengths, have the characteristic of being easily absorbed by blood flow. It is possible to capture blood flow images using transmitted light from LEDs 5 of either near-infrared or red wavelengths.
• the multiple LEDs 5 may have the same specifications, but may also have different specifications. For example, only one LED 5 may have a different wavelength, or two or more types of LEDs 5 with different wavelengths may be used. For example, by changing at least one of the LEDs 5a to 5e to a red LED and combining a near-infrared LED with a red LED, a clearer blood flow image may be obtained.
• 6a to 6e are cover glasses that seal the openings in the cover and allow the light emitted by the LED 5 (hereinafter sometimes referred to as "near-infrared light") to pass through.
• 7 indicates the luminous flux of the near-infrared light, which indicates that it is irradiated over an area that covers the width of the finger from the back side of the finger.
• 8 is an FPC (flexible printed circuit board) on which the circuit components of the blood flow authentication ring 2 are mounted.
• 9 indicates a microcomputer that performs various calculation processes from the obtained image.
• 10 is a flexible solar panel that stores power in a capacitor (not shown) while supplying power to the circuit, thereby providing a blood flow authentication ring that does not require a battery.
• 11 is a communication module, for example a BLE (Bluetooth Low Energy) module, which has the function of pairing with an external device and communicating information with low power consumption.
• BLE Bluetooth Low Energy
• FIG. 12A shows an embodiment in which one camera module is arranged.
• a plurality of LEDs 5 near-infrared LEDs or red LEDs
• FIG. 3B a plurality of LEDs 5 (near-infrared LEDs or red LEDs) are arranged to increase the amount of light and expand the range of illumination, and multiple camera modules 12 are provided.
• FIG. 5 near-infrared LEDs or red LEDs
• 3B shows an example in which five LEDs 5 and three camera modules 12 are provided, but this modification is not limited to this.
• the camera module 12 is arranged to capture the light emitted by the LED 5
• the number of LEDs 5 and the number of camera modules 12 can be any number greater than one, and the arrangement is also arbitrary.
• Reference numeral 13 denotes the light flux in the imaging range (angle of view) of this camera module.
• Reference numeral 14 denotes an optical filter, which can be, for example, a visible light cut filter that blocks 90% or more of light with wavelengths less than 850 nm to 950 nm. Using a visible light cut filter as the optical filter can improve the accuracy of blood flow authentication by preventing images that are not necessary for blood flow authentication, such as wrinkles or scratches on the surface of the finger, from being captured.
• Reference numeral 15 denotes a size correction member that is placed between the finger and the ring.
• the LED 5, communication module 11, and microcomputer 9 are mounted on the FPC 8.
• the first case 3 has a circumferential groove
• the FPC 8 is fixed between the first case 3 and the second case 4 in an arc-shaped state that follows the groove.
• the second case 4 has a circumferential groove like the first case 3.
• the second case 4 has an opening on the inner side of the LED 5 at the position where the LED 5 is arranged so that the light emitted by the LED 5 can pass through.
• the camera module 12 is accommodated in a camera module housing section in the groove of the second case 4.
• An optical filter 14 is provided on the inner side of the camera module housing section, so that the light emitted from the LED 5 (illumination light beam 7) is captured by the camera module 12 as a camera light beam 13 via the optical filter 14.
• the size correction member 15 is a roughly U-shaped member that follows an arc shape, and is arranged on the inner circumference of the first case 3 and the second case 4, and functions as a spacer between the inner circumference of the first case 3 and the second case 4 and the outer circumference of the finger.
• a through hole is provided in the part of the size correction member 15 that corresponds to the position where the LED 5 is arranged, and the light (irradiation light beam 7) emitted from the LED 5 passes through the through hole and is irradiated to the inner circumference side of the size correction member 15.
• FIG. 5 is a diagram showing the structure of the size correction member 15 of the invention related to this application.
• the size correction member 15 consists of an elastic member 15a and a surface member 15b.
• the elastic member 15a is an elastic member
• the surface member 15b is a sheet-like material whose reflectance from 850 nm to 950 nm is suppressed to less than 10%, and is formed integrally with the elastic portion.
• the surface member 15b is made of a material with a dynamic friction coefficient of less than 0.2 and has been surface-treated, which reduces the risk of catching when inserting a finger and allows for smooth insertion and removal. Furthermore, by improving the sliding properties of the surface of the surface member 15b, durability is increased when repeatedly inserted and removed.
• Figure 6 is a diagram showing the direction of force exerted by the deflection of size correction member 15 of the invention of this application.
• Size correction member 15 supports at least the upper direction (back side) of the finger and both sides of the finger, and when worn, elastic forces act in the directions shown by arrows 16a, 16b, and 16c in Figure 6, urging the finger toward the center of the ring in the left-right direction and downward (toward the camera module) in the up-down direction.
• FIG. 7A is a vertical cross-sectional view of the relative positions of finger 1 and blood flow authentication ring 2 when a person with relatively thick fingers wears blood flow authentication ring 2 of the present application, according to the invention of this application.
• FIG. 7B is a vertical cross-sectional view of the relative positions of finger 1 and blood flow authentication ring 2 when a person with relatively thin fingers wears blood flow authentication ring 2 of the present application, according to the invention of this application.
• FIG. 7A a relatively thick finger is inserted into the blood flow authentication ring 2, so the size correction member 15 bends from the inner circumference side toward the outer circumference by a deflection amount 17a.
• FIG. 7B a relatively thin finger is inserted into the blood flow authentication ring 2, so the size correction member 15 bends from the inner circumference side toward the outer circumference by a deflection amount 17b.
• the deflection amount 17a is larger than the deflection amount 17b depending on the thickness of the finger.
• the deflection amounts 17a and 17b of the size correction member 15 change depending on the thickness of the finger, so that as shown in FIG. 7A and FIG.
• the elasticity of the size correction member 15 allows it to be attached without gaps while absorbing the difference in finger thickness, and it is biased downward (toward the camera module).
• the distance X from the imaging position of the camera module 12 (the focal plane, the imaging position in FIG. 7A and FIG. 7B) to the surface of the finger 1 is kept constant regardless of the size of the finger.
• the distance X from the imaging position (the focal plane, the imaging position in Figures 7A and 7B) to the surface of the finger is constant has the advantage that a stable focused image can be obtained regardless of the thickness of a person's finger.
• the surface member 15b is a sheet-like material with a reflectance of less than 10% from 850 nm to 950 nm, and by making the surface of the size correction member 15 low reflectance, reflections on the inner circumference side of the ring caused by near-infrared light irradiation and stray light from external light are also suppressed, resulting in a high-contrast blood flow image.
• the same effect can be obtained by applying the same low-reflection treatment to the inside of the housing.
• FIG. 8 is a diagram explaining the authentication judgment of the invention related to this application.
• the owner of the blood flow authentication ring 2 registers his/her identity in advance before blood flow authentication is performed (registered image: 18).
• 19a, 19b, 19c, 19d, and 19e are blood flow images of different people's fingers.
• the blood flow authentication ring of this application compares the registered image 18 acquired in advance with the blood flow authentication image, and judges whether the person wearing the ring is the owner or not by checking that 19a to 19d are different from the owner's blood flow and only 19e is the same as the registered image.
• FIG. 9 is a perspective view showing the unlocking and locking of a door using the blood flow authentication ring 2 of this embodiment.
• 20 is a receiving device that can receive a BLE signal as a communication signal
• 21 is a device that unlocks and locks the door
• 22 is a doorknob that opens and closes the door.
• 23 indicates communication, for example, BLE communication.
• FIG 10 is a flowchart showing the locking and unlocking of a door using the blood flow authentication ring of the invention of this application.
• flowchart 24 When the captured image matches the registered image described above and is in an authenticated state (authentication possible) (flowchart 24), pairing and information communication are performed between the blood flow authentication ring 2 of this application and the receiving device 20 installed in the door (flowchart 25).
• the receiving device 20 of the door receives an authentication signal
• the door is unlocked by sending an unlocking signal to the locking and unlocking device 21 (flowchart 26). After that, the door is automatically locked a predetermined time after the door to the room is closed.
• the blood flow authentication result from the blood flow authentication ring 2 is transmitted to the receiving device 20 by communication 23, for example, BLE communication, via the communication module 11.
• communication 23 for example, BLE communication
• the door lock 21 can be unlocked and locked.
• the door lock 21 cannot be unlocked or locked.
• the door lock 21 cannot be unlocked or locked contactlessly by communication 23, even when a mechanical key is not used.
• the blood flow authentication ring 2 is lost or stolen, even if another person attempts to use the blood flow authentication ring 2 to unlock or lock the door lock 21, the blood flow authentication results will be inauthentic for the other person's finger, so it will be impossible for another person to use the blood flow authentication ring 2 to unlock or lock the door lock 21 in a non-contact manner.
• FIG. 11 is a vertical cross-sectional view of the second embodiment with a vital sensor and NFC added.
• the blood flow authentication ring 2 of this embodiment is equipped with a small reflective sensor (hereinafter referred to as a vital sensor) 29 that has a red LED, an infrared LED, and a highly sensitive photodiode that receives the reflected light mounted in one package, a near field communication device (hereinafter referred to as NFC) 27, and an antenna flex (flexible circuit board with an antenna) 28.
• This vital sensor 29 can measure blood oxygen saturation (hereinafter referred to as SpO2 value) from the ratio (R/IR) of the fluctuating components of the transmitted light amount of red light (R) and infrared light (IR).
• the pulse rate can be obtained at the same time.
• the intervals between each pulse wave fluctuate slightly, and the degree of fluctuation of this pulse rate is the "stress level".
• the accelerated pulse wave which is calculated by taking the second derivative of the pulse rate, and blood pressure, making it possible to estimate blood pressure. In this way, this vital sensor can measure SpO2 value, pulse rate, stress level, and estimated blood pressure.
• NFC Near Field Communication
• NFC-equipped credit cards and smart rings for payment have also appeared, simplifying payment.
• the NFC function is enabled only when the ring has authenticated the person in question, so there is a great advantage in preventing payments by anyone other than the person in question.
• the NFC antenna flex 28 is placed on a wide area on the inside surface of the ring, separate from the NFC 27, which is a contactless IC, to increase communication sensitivity and adopt a structure that is easy to respond to in various ways of holding the device over the phone.
• Figure 12 is an enlarged view of the relative positions of the NFC antenna flex 28 and the solar panel 10.
• the solar panel 10 is placed at the outermost part inside the first case 4, and the NFC antenna flex 28 is placed behind it. This makes it possible to maximize the light receiving efficiency without blocking the solar panel 10. Meanwhile, because the solar panel 10 is not magnetic, placing the NFC antenna flex 28 behind it does not impede the NFC communication sensitivity.
• FIG. 13 is a flowchart from the insertion of a finger to the settlement process using the blood flow authentication ring 2 of this embodiment.
• an identification number is printed and written on each blood flow authentication ring 2 during the manufacturing process, and the settlement system is finally activated (enabled) corresponding to the identification number of the blood flow authentication ring 2.
• the owner of the blood flow authentication ring 2 must register himself/herself before blood flow authentication is performed.
• the blood flow authentication ring 2 operates the vital sensor at regular intervals to detect whether the ring is worn or not (flowchart 30).
• the blood flow authentication ring 2 compares the blood flow authentication image with the previously acquired registered image, and if the image matches the registered image, determines whether the wearer is the owner (flowchart 33). If it is determined that the wearer is the owner, the NFC function is enabled, and if not, the NFC function is disabled (flowcharts 34 and 35). Then, with the NFC function enabled, the settlement process is performed (flowchart 36).
• the blood flow authentication ring 2 has been described above as an embodiment of the present invention, but the above embodiment is merely an example of the blood flow authentication ring 2 for embodying the technical concept of the present invention, and does not limit the present invention to these, but can be equally applied to other embodiments, such as modified versions of each embodiment or combinations of each embodiment.
• a blood flow authentication ring worn on a finger is given as a specific example, but this is merely one example, and the blood flow authentication ring of this embodiment is not limited to being worn on a finger, but can be applied to any part of the body as long as blood flow can be recognized. For example, it can be applied to the arms, legs, face (e.g. ears), etc.
• the structure and shape of the blood flow authentication ring 2 illustrated in the embodiment are merely examples, and the structure and shape of this embodiment are not limited to these, and there is a wide range of design freedom in terms of design, assembly, part selection, etc.
• the distance from the image sensor to the finger surface can be kept constant regardless of finger size, which has industrial applicability. Furthermore, as a ring with blood flow authentication function, payment function, and vital information acquisition function, it can easily perform everything from personal registration to authentication, making it easy for anyone to use and safe from a security perspective, which has industrial applicability.

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• 2023
  • 2023-09-28 CN CN202380069204.8A patent/CN119947642B/zh active Active
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