Source: http://www.google.com/patents/US8208691?dq=6125447
Timestamp: 2017-11-23 15:25:10
Document Index: 578887866

Matched Legal Cases: ['art 110', 'art 110', 'art 110', 'art 110', 'art 110', 'art 110', 'art 110']

Patent US8208691 - Personal authentication device - Google Patents
A compact authentication device that prevents user from feeling pressure and is strong against external light, when capturing an image of a finger blood vessel pattern with transmitted light. The device includes a guidance part for determining the finger position, a light source disposed on at least...http://www.google.com/patents/US8208691?utm_source=gb-gplus-sharePatent US8208691 - Personal authentication device
Publication number US8208691 B2
Application number US 11/907,735
Also published as CN1527247A, CN1527247B, CN101030249A, CN101030249B, CN101030250A, CN101030250B, CN102682285A, CN102682285B, CN102722693A, CN102722693B, CN102722694A, CN102722694B, CN102737229A, CN102737229B, DE10332106A1, DE10332106B4, DE10362243B4, US7245745, US7706582, US8121354, US9141843, US20040184641, US20050254690, US20080049981, US20080049982, US20080152195
Publication number 11907735, 907735, US 8208691 B2, US 8208691B2, US-B2-8208691, US8208691 B2, US8208691B2
Inventors Akio Nagasaka, Takafumi Miyatake, Naoto Miura, Yuichi Kashimura
Patent Citations (36), Classifications (16), Legal Events (1)
Personal authentication device
US 8208691 B2
a light source for irradiating a light to a hand of a user;
an imaging unit for creating an image of transmitted light from the hand of the user;
a shading element for preventing entering of light other than the transmitted light;
a memory unit for storing condition of light to the hand of the user; and
a processing unit for extracting a feature of a vein pattern from the image and comparing the feature of the vein pattern with stored feature in the memory unit;
wherein the processing unit calculates an irradiation condition which prevents saturation of the image of hand of the user according to a thickness of hand or a thickness of finger of the user and stores the irradiation condition in the memory unit as the irradiation condition of light to the hand of the user.
2. The personal authentication apparatus according to claim 1, wherein the irradiation condition of light comprises a light amount of the light source and an irradiating angle of light of the light source.
3. The personal authentication apparatus according to claim 1, wherein the memory unit stores the thickness of a finger of the user.
4. The personal authentication apparatus according to claim 1, wherein the memory unit stores the thickness of a hand of the user.
5. The personal authentication apparatus according to claim 1, further comprising a sensor for measuring a thickness of finger of the user.
Herein, transmitted light means light that is transmitted through the inside of a finger, and the term “transmitted light” is used in meaning as distinguished from light reflected by the surface of the skin or the epidermis.
Specifically, within each of the light source parts shown in FIG. 1, a light source 114 for emitting infrared light is mounted on a shading plate 116. The shading plate prevents light from traveling to the lower side of the finger, and serves as a yardstick of the position in which the finger is placed. The shading plate serves as a part of the guide groove as well. By making the plane of the shading plate nearly coincide with an optical axis of the light source and turn the optical axis toward the upper side of the finger, it becomes possible to shade light from the lower side of the finger while efficiently using the strongest light portion of the light source. If the slant of the shading plate is made sufficient and the light source is placed on the bottom end side, then the light source is housed in a position lower than that of the guide groove, and the device can be made thin. At this time, the guide groove including parts of the shield plates is subjected to surface treatment using a lusterless paint, material or pattern in order to prevent light reflected by the back side, i.e., the upper side of the finger from being reflected by the guide groove again and applied to the side face of the finger. If the range in which the irradiation of light is restrained is approximately ½ to ⅔ from the image capture part face as compared with the width of the finger seen from the side face of the finger, then an experimentally clear blood vessel pattern is obtained.
It will be appreciated from this graph that there are slight variations due to individual difference. In the case where the finger side face region of approximately ⅔ from the image capture part face is shaded, however, the saturated regions disappear. It will be appreciated that the saturated regions can be restrained to approximately 10% when the finger side face region of approximately ½ is shaded. If the light sources are disposed so as to apply light to the upper side of the finger side face as if the upper side is looked up from below, then the strength of light that reaches the lower side of the finger is restrained, resulting in a higher efficient. The elevation angle at that time can be obtained easily from a direction angle peculiar to the light source that indicates the degree of spread of light in the travel direction, and the above described ideal shading ratio of the finger side face.
FIG. 4 is an enlarged view obtained by watching the guide groove 108, on which the finger is placed, from the side face in a variation of the authentication device 100. On the bottom of the guide groove, there is the image capture opening part 110. Under the image capture opening part 110, there is a camera 112. The guide groove 108, on which the finger is placed, may be flat. As shown in FIG. 4, however, the guide groove 108, on which the finger is placed, may be designed to draw an are from the image capture opening part 110 to a finger tip portion so that the finger will be naturally bent. If it is attempted to stretch the finger straightly, then resultant strain of the skin of the finger presses the blood vessel and obstructs flow of blood, and consequently the blood vessel pattern is not obtained in some cases. If the shape draws an arc as shown in FIG. 4, however, the finger is naturally bent, and consequently the blood vessel is not pressed. Furthermore, in the naturally bent state, the finger does not touch the surface of the transparent plate in the opening part 110. Since there is no contact with the surface of the transparent plate, neither the pressure of the blood vessel nor adhesion of stains is caused. Furthermore, by disposing the transparent plate included in the opening part 110 in a lower position, or forming a finger rest 400 in order to lift the root of the finger out of the opening part 110, it is also possible to more certainly prevent the blood vessel from being pressed by contact between the opening part 110 and the finger. Furthermore, by limiting the height of the guide groove in the finger tip portion so as to just house the belly portion of the finger tip therein, and opening the top part, even a person wearing fingernails long or wearing attached fingernails can place the finger in a predetermined position without inconvenience.
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JP2001000422A Title not available
JP2001242952A Title not available
JP2002083298A Title not available
JP2002345953A Title not available
JP2003030632A Title not available
JPH01223576A Title not available
JPH11203478A Title not available
U.S. Classification 382/115, 382/116, 382/118, 382/119, 382/124, 382/117
International Classification G06K9/00, G07C9/00, A61B5/117, G06T1/00
Cooperative Classification G06K2009/00932, G06K9/00013, G07C9/00158, G06K9/00
European Classification G06K9/00A1, G06K9/00