JP2002123822A - Fingerprint image input device - Google Patents
Fingerprint image input deviceInfo
- Publication number
- JP2002123822A JP2002123822A JP2000315561A JP2000315561A JP2002123822A JP 2002123822 A JP2002123822 A JP 2002123822A JP 2000315561 A JP2000315561 A JP 2000315561A JP 2000315561 A JP2000315561 A JP 2000315561A JP 2002123822 A JP2002123822 A JP 2002123822A
- Authority
- JP
- Japan
- Prior art keywords
- fingerprint
- guide plate
- light guide
- fingerprint image
- input device
- 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
Links
Landscapes
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば指紋による
本人認証などに用いられ指紋画像の入力を行う指紋画像
入力装置に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a fingerprint image input device for inputting a fingerprint image used for, for example, personal identification using a fingerprint.
【０００２】[0002]
【従来の技術】近年、指紋画像を用いて本人の認証を行
う、指紋認証装置が考えられている。2. Description of the Related Art In recent years, a fingerprint authentication device that authenticates a person using a fingerprint image has been proposed.
【０００３】この指紋認証装置は、登録対象者の指紋の
画像を光学的に読み取って登録し、この登録された指紋
画像と、その後に読み取り入力された認証対象者の指紋
画像とを照合比較してその同一性を判断し、本人かどう
かの認証を行うものである。This fingerprint authentication apparatus optically reads and registers a fingerprint image of a person to be registered, and compares and compares the registered fingerprint image with a fingerprint image of the person to be authenticated which is read and input thereafter. In this case, the identity of the person is determined, and the identity of the person is verified.
【０００４】このような指紋認証装置において認証すべ
き人物の指紋画像は、指紋画像入力装置により光学画像
として読み取られるが、従来ある指紋画像入力装置は、
例えば次のように構成されている。A fingerprint image of a person to be authenticated by such a fingerprint authentication device is read as an optical image by a fingerprint image input device.
For example, it is configured as follows.
【０００５】すなわち、従来の指紋画像入力装置は、例
えば特開平１０−２８９３０４号公報に開示されるよう
に、上面に指を押圧接触させる導光板と、この導光板の
端部に配置し照明光を入射するＬＥＤと、前記導光板の
下面側に前記指に対向して配置した２次元イメージセン
サと、前記導光板と２次元イメージセンサとの中間に配
置したセルフォックレンズプレートと、これらの構成要
素を支持固定する筐体遮光体とを備えて構成されるもの
で、前記ＬＥＤからの照明光が導光板の内部を全反射を
繰り返して伝搬する状態において、当該導光板の上面に
指を押圧接触させると、この導光板との接触面における
指からの散乱光がセルフォックレンズプレートを通して
２次元イメージセンサに結像され、指紋の画像が得られ
るものである。[0005] That is, a conventional fingerprint image input device includes, as disclosed in, for example, Japanese Patent Application Laid-Open No. 10-289304, a light guide plate for pressing a finger on an upper surface thereof, and an illumination light disposed at an end of the light guide plate. LED, a two-dimensional image sensor arranged on the lower surface side of the light guide plate so as to face the finger, a selfoc lens plate arranged between the light guide plate and the two-dimensional image sensor, and configurations thereof. And a housing light-shielding body for supporting and fixing the element.In a state where the illumination light from the LED propagates inside the light guide plate by repeating total reflection, a finger is pressed on the upper surface of the light guide plate. Upon contact, the scattered light from the finger on the contact surface with the light guide plate forms an image on the two-dimensional image sensor through the SELFOC lens plate, and a fingerprint image is obtained.
【０００６】[0006]
【発明が解決しようとする課題】このように、従来の指
紋画像入力装置では、導光板において、その端面からの
照明光が理想的な全反射を繰り返し伝達される状態で、
指紋の凹凸部における凸部が導光板と接触した部分で全
反射しなくなり、この指紋凸部に対応した光が下面側に
配置した撮像系に導かれて撮影されるものであるが、前
記指紋凸部の導光板との接触部に生じる乱反射が指紋凹
部にも当たって撮像系へ導かれたり、外部から指の周辺
を回り込んだ光や指そのものを透過した光が撮像系へ導
かれる欠点があり、良好な指紋画像が得られない問題が
ある。As described above, in the conventional fingerprint image input device, in the light guide plate, the illumination light from the end face is repeatedly transmitted with ideal total reflection.
The convex portion of the concave and convex portion of the fingerprint is not totally reflected at a portion in contact with the light guide plate, and light corresponding to the fingerprint convex portion is guided to an image pickup system arranged on the lower surface side to be photographed. The drawback is that irregular reflection generated at the contact of the convex part with the light guide plate hits the fingerprint concave part and is guided to the imaging system, or light that has wrapped around the finger from outside or transmitted through the finger itself is guided to the imaging system. There is a problem that a good fingerprint image cannot be obtained.
【０００７】また、導光板において、その端面からの照
明光を理想的に全反射させるには、当該導光板を透明平
行平板の剛体とする必要があるため、指の曲面に馴染み
難く該指の指紋を広範囲に良好な指紋画像として得るこ
とができない問題がある。Further, in order to ideally totally reflect the illumination light from the end face of the light guide plate, it is necessary to make the light guide plate a transparent parallel plate rigid body, so that the light guide plate is hardly adapted to the curved surface of the finger. There is a problem that a fingerprint cannot be obtained as a good fingerprint image over a wide range.
【０００８】本発明は、前記のような問題に鑑みなされ
たもので、その第１の目的は、導光板と接触する指紋凸
部からの乱反射が指紋凹部にも影響するなどの問題が生
じることなく、良好な指紋画像を得ることが可能になる
指紋画像入力装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first object of the present invention is to cause a problem that irregular reflection from a fingerprint convex portion in contact with a light guide plate affects a fingerprint concave portion. It is another object of the present invention to provide a fingerprint image input device capable of obtaining a good fingerprint image.
【０００９】また、本発明の第２の目的は、指紋を広範
囲に良好な指紋画像として得ることが可能になる指紋画
像入力装置を提供することにある。It is a second object of the present invention to provide a fingerprint image input device capable of obtaining a fingerprint as a good fingerprint image over a wide range.
【００１０】[0010]
【課題を解決するための手段】すなわち、本発明の請求
項１に係る指紋画像入力装置は、平板状の導光板と、こ
の導光板の端面に対応して配置され、当該導光板の内部
に光を入射する光源と、前記導光板の上面に形成され、
当該導光板の内部に伝搬された光を拡散する拡散層と、
前記導光板の下面に対向して配置された撮像素子と、こ
の撮像素子と前記導光板の下面との間に配置され、当該
導光板上面の前記拡散層により拡散された光を前記撮像
素子に結像させる撮像レンズとを備え、前記拡散層の上
面に指を接触した際に、その接触面内の指紋凸部に対応
する部分を暗部、非接触となる指紋凹部に対応する部分
を明部として指紋画像を撮像することを特徴とする。That is, a fingerprint image input device according to a first aspect of the present invention is provided with a flat light guide plate, and is disposed corresponding to an end face of the light guide plate, and is provided inside the light guide plate. A light source for incident light, formed on the upper surface of the light guide plate,
A diffusion layer for diffusing light propagated inside the light guide plate,
An image sensor arranged opposite to the lower surface of the light guide plate, disposed between the image sensor and the lower surface of the light guide plate, and light diffused by the diffusion layer on the upper surface of the light guide plate to the image sensor. An imaging lens for forming an image, when a finger contacts the upper surface of the diffusion layer, a portion corresponding to a fingerprint convex portion in the contact surface is a dark portion, and a portion corresponding to a non-contact fingerprint concave portion is a bright portion. And capturing a fingerprint image.
【００１１】このような本発明の請求項１に係る指紋画
像入力装置では、指の接触面となる導光板の上面に拡散
層を形成し、この拡散層に対して指の指紋面を接触させ
ることにより、その接触面内の指紋凸部に対応する部分
が拡散率の低下による暗部、非接触の指紋凹部に対応す
る部分が明部となる指紋画像を、前記導光板の下面側に
対向配置した撮像素子に撮像させるので、指紋凸部によ
る乱反射の問題はなくなることになる。[0011] In the fingerprint image input device according to the first aspect of the present invention, a diffusion layer is formed on the upper surface of the light guide plate serving as a contact surface of the finger, and the fingerprint surface of the finger is brought into contact with the diffusion layer. Thereby, a fingerprint image in which a portion corresponding to a fingerprint convex portion in the contact surface is a dark portion due to a decrease in diffusion rate, and a portion corresponding to a non-contact fingerprint concave portion is a bright portion is opposed to the lower surface side of the light guide plate. In this case, the problem of irregular reflection due to the fingerprint projection is eliminated.
【００１２】また、本発明の請求項２に係る指紋画像入
力装置は、前記請求項１に係る指紋画像入力装置にあっ
て、前記拡散層は、前記導光板の上面に指の押圧により
変形する透明弾性体を介在し、この透明弾性体の上面に
形成されることを特徴とする。According to a second aspect of the present invention, there is provided the fingerprint image input device according to the first aspect, wherein the diffusion layer is deformed on the upper surface of the light guide plate by pressing a finger. A transparent elastic body is interposed and formed on the upper surface of the transparent elastic body.
【００１３】このような本発明の請求項２に係る指紋画
像入力装置では、指紋画像の読み取り面となる拡散層面
が、前記拡散層に対する指の押圧接触によってその指の
曲面に合わせて変形するので、前記指紋画像の読み取り
面となる拡散層面に対し、より広範囲な指紋面を歪み無
く密着できることになる。[0013] In the fingerprint image input device according to the second aspect of the present invention, the surface of the diffusion layer, which is the reading surface of the fingerprint image, is deformed in accordance with the curved surface of the finger when the finger presses the diffusion layer. Thus, a wider range of the fingerprint surface can be adhered to the diffusion layer surface serving as the fingerprint image reading surface without distortion.
【００１４】また、本発明の請求項３に係る指紋画像入
力装置は、前記請求項１に係る指紋画像入力装置にあっ
て、前記導光板の上面は、指の指紋面に合わせた曲面形
状に形成され、この曲面部の上面に前記拡散層が形成さ
れることを特徴とする。According to a third aspect of the present invention, there is provided the fingerprint image input device according to the first aspect, wherein the upper surface of the light guide plate has a curved surface shape corresponding to the fingerprint surface of the finger. And the diffusion layer is formed on the upper surface of the curved surface portion.
【００１５】このような本発明の請求項３に係る指紋画
像入力装置では、指紋画像の読み取り面となる導光板上
の拡散層面が、指の指紋面に合わせて曲面形成された導
光板の上面に対応する曲面として設定されるので、前記
指紋画像の読み取り面となる拡散層面に対し、さらに広
範囲な指紋面を歪み無く密着できることになる。In the fingerprint image input device according to the third aspect of the present invention, the diffusion layer surface on the light guide plate serving as a fingerprint image reading surface has a curved surface formed in accordance with the fingerprint surface of the finger. Is set as a curved surface corresponding to the above, so that a wider range of the fingerprint surface can be adhered without distortion to the diffusion layer surface serving as the fingerprint image reading surface.
【００１６】[0016]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態について説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１７】（第１実施形態）図１は本発明の第１実施
形態に係る指紋画像入力装置の構成を示す図である。(First Embodiment) FIG. 1 is a diagram showing a configuration of a fingerprint image input device according to a first embodiment of the present invention.
【００１８】この指紋画像入力装置１０は、導光板１１
を備えている。The fingerprint image input device 10 includes a light guide plate 11
It has.
【００１９】この導光板１１は、アクリル製の透明平行
平板からなるもので、この導光板１１の一端面には、蛍
光管１２が配置される。This light guide plate 11 is made of a transparent parallel flat plate made of acryl, and a fluorescent tube 12 is disposed on one end surface of the light guide plate 11.
【００２０】この蛍光管１２は、前記導光板１１の端面
から当該導光板１１の内部に向けて照明光を入射するも
ので、この蛍光管１２からの照明光が入射される導光板
１１の上面（指Ｈの押圧面）には、拡散フィルム１３が
接着される。The fluorescent tube 12 receives illumination light from the end face of the light guide plate 11 toward the inside of the light guide plate 11, and the upper surface of the light guide plate 11 on which the illumination light from the fluorescent tube 12 is incident. The diffusion film 13 is bonded to the (pressing surface of the finger H).
【００２１】この拡散フィルム１３は、透過型の有機拡
散剤が塗布されたＰＥＴ（ポリエチレンテレフタレー
ト）からなるもので、この拡散フィルム１３は、指Ｈが
当該拡散フィルム１３に押圧接触されてない状態では、
導光板１１の内部にその端面から入射された照明光を一
様に拡散させてその拡散光を導光板１１の下面から放射
させ、また、指Ｈが当該拡散フィルム１３に押圧接触さ
れている状態では、該指Ｈと接触している指紋凸部Ｈａ
に対応する部分における拡散反射率が低下することで、
この指紋凸部Ｈａに対応する部分のみ暗部となる拡散光
を導光板１１の下面から放射させる。The diffusion film 13 is made of PET (polyethylene terephthalate) coated with a transmission type organic diffusion agent. The diffusion film 13 is in a state where the finger H is not pressed against the diffusion film 13. ,
A state in which the illumination light incident from the end face of the light guide plate 11 is uniformly diffused into the light guide plate 11 to emit the diffused light from the lower surface of the light guide plate 11, and the finger H is pressed against the diffusion film 13. Then, the fingerprint convex portion Ha in contact with the finger H
By reducing the diffuse reflectance at the part corresponding to,
Diffusion light, which becomes a dark portion only at a portion corresponding to the fingerprint convex portion Ha, is emitted from the lower surface of the light guide plate 11.
【００２２】前記導光板１１の下面に対向する下方に
は、２次元イメージセンサである固体撮像素子（ＣＣ
Ｄ）１４が配置され、この固体撮像素子（ＣＣＤ）１４
と導光板１１との間には、該導光板１１の上面、つまり
前記拡散フィルム１３の接着面において拡散され導光板
１１の下面から放射された光を当該拡散フィルム１３の
接着面を焦点として固体撮像素子（ＣＣＤ）１４の撮像
面に結像させるための撮像レンズ１５が配置される。Below the light guide plate 11, a solid-state image sensor (CC), which is a two-dimensional image sensor, is provided below.
D) 14 is arranged, and the solid-state imaging device (CCD) 14
Between the light guide plate 11 and the upper surface of the light guide plate 11, that is, light that is diffused on the bonding surface of the diffusion film 13 and emitted from the lower surface of the light guide plate 11 is focused on the bonding surface of the diffusion film 13 as a focal point. An imaging lens 15 for forming an image on an imaging surface of an imaging device (CCD) 14 is arranged.
【００２３】そして、前記導光板１１、蛍光管１２、拡
散フィルム１３、撮像素子（ＣＣＤ）１４、撮像レンズ
１５からなる指紋撮像光学系の各部品は、遮光性の筐体
１６によりそれぞれ支持固定されて指紋画像入力装置１
０が構成される。Each part of the fingerprint image pickup optical system including the light guide plate 11, the fluorescent tube 12, the diffusion film 13, the image pickup device (CCD) 14, and the image pickup lens 15 is supported and fixed by a light-shielding casing 16. Fingerprint image input device 1
0 is configured.
【００２４】すなわち、このように構成された本発明の
第１実施形態に係る指紋画像入力装置１０において、指
Ｈを導光板１１の上面に接着した拡散フィルム１３に押
圧接触しない状態では、導光板１１の内部にその端面の
蛍光管１２から入射された照明光は、拡散フィルム１３
との接着面において一様に拡散され、その全体が明部と
して撮像素子（ＣＣＤ）１４に撮像される。That is, in the thus configured fingerprint image input device 10 according to the first embodiment of the present invention, when the finger H is not pressed against the diffusion film 13 adhered to the upper surface of the light guide plate 11, the light guide plate Illumination light incident from the fluorescent tube 12 on the end face into the inside of the
The light is uniformly diffused on the bonding surface, and the entire image is picked up by the image pickup device (CCD) 14 as a bright portion.
【００２５】また、指Ｈを導光板１１の上面に接着した
拡散フィルム１３に押圧接触した状態では、導光板１１
において前記指Ｈと接触した指紋凸部Ｈａに対応する部
分の拡散反射率が低下するので、この指紋凸部Ｈａに対
応する部分のみ暗部となる光学像が撮像素子（ＣＣＤ）
１４に撮像される。When the finger H is in pressure contact with the diffusion film 13 adhered to the upper surface of the light guide plate 11, the light guide plate 11
In the above, the diffuse reflectance of the portion corresponding to the fingerprint convex portion Ha that has come into contact with the finger H decreases, so that an optical image in which only the portion corresponding to the fingerprint convex portion Ha becomes a dark portion is taken by an image pickup device (CCD).
14 is taken.
【００２６】これにより、指Ｈの指紋は、その拡散フィ
ルム１３との接触面である指紋凸部Ｈａが暗部、非接触
面である指紋凹部Ｈｂが明部となる指紋画像として撮像
素子（ＣＣＤ）１４に撮像される。As a result, the fingerprint of the finger H is formed as an image sensor (CCD) as a fingerprint image in which the fingerprint projection Ha which is the contact surface with the diffusion film 13 is a dark portion, and the fingerprint depression Hb which is the non-contact surface is a bright portion. 14 is taken.
【００２７】この場合、指Ｈの周辺から回り込む外光や
指Ｈそのものを透過した外光は、拡散フィルム１３によ
り大幅に減衰されるので、導光板１１及び撮像レンズ１
５を通して撮像素子（ＣＣＤ）１４に撮像される光学指
紋画像に影響を及ぼすことはない。In this case, the external light circulating from the periphery of the finger H and the external light transmitted through the finger H itself are greatly attenuated by the diffusion film 13, so that the light guide plate 11 and the imaging lens 1
5 does not affect the optical fingerprint image picked up by the image pickup device (CCD) 14.
【００２８】したがって、前記構成の本発明の第１実施
形態に係る指紋画像入力装置１０によれば、指Ｈを押圧
接触させる導光板１１の上面に拡散フィルム１３を接着
配置し、この拡散フィルム１３に押圧接触された指紋凸
部Ｈａに対応する部分のみ拡散率の低下により暗部とな
り、それ以外の非接触の指紋凹部Ｈｂに対応する部分が
明部となる指紋画像が、前記導光板１１の下方に撮像レ
ンズ１５を介して前記拡散フイルム１３との接着面を焦
点として配置した撮像素子（ＣＣＤ）１４により撮像さ
れるので、従来の指紋画像入力装置にあるような導光板
に直接接触した指紋凸部の反射を明部とした指紋画像を
撮像する場合の乱反射による悪影響や外光による悪影響
が生じることなく、良好な指紋画像を得ることができ
る。Therefore, according to the fingerprint image input device 10 according to the first embodiment of the present invention, the diffusion film 13 is bonded and arranged on the upper surface of the light guide plate 11 with which the finger H is pressed and brought into contact. The fingerprint image in which only the portion corresponding to the fingerprint convex portion Ha that has been pressed into contact becomes a dark portion due to a decrease in the diffusion rate, and the other portion corresponding to the non-contact fingerprint concave portion Hb becomes a bright portion is below the light guide plate 11. The image is picked up by an image pickup device (CCD) 14 having a focal point at the bonding surface with the diffusion film 13 via an image pickup lens 15, so that a fingerprint convex directly in contact with a light guide plate as in a conventional fingerprint image input device is used. A good fingerprint image can be obtained without adverse effects due to irregular reflection and external light when capturing a fingerprint image in which the reflection of the part is a bright part.
【００２９】なお、前記第１実施形態では、指Ｈの押圧
接触面となる拡散フィルム１３が接着された導光板１１
の上面は、当該導光板１１が平行平板であるために平面
形状に構成されているが、次の第２実施形態（図２参
照）において説明するように、導光板１１の上面に透明
弾性体１７を介在させて拡散フィルム１３を接着配置
し、指Ｈを押圧接触させた際に、当該指Ｈの曲面形状に
その光学画像の取り込み面が変形して馴染む構成として
もよい。In the first embodiment, the light guide plate 11 to which the diffusion film 13 serving as the pressing contact surface of the finger H is adhered is used.
The upper surface of the light guide plate 11 is formed in a planar shape because the light guide plate 11 is a parallel plate, but as described in the next second embodiment (see FIG. 2), a transparent elastic body is formed on the upper surface of the light guide plate 11. When the finger H is pressed and contacted with the diffusion film 13 interposed therebetween with the intermediary of 17, the capturing surface of the optical image may be deformed into the curved shape of the finger H and adapted.
【００３０】（第２実施形態）図２は本発明の第２実施
形態に係る指紋画像入力装置の構成を示す図である。(Second Embodiment) FIG. 2 is a diagram showing a configuration of a fingerprint image input device according to a second embodiment of the present invention.
【００３１】この本発明の第２実施形態に係る指紋画像
入力装置１０では、透明平行平板である導光板１１の上
面に、シリコンなどの光硬化性樹脂からなる透明弾性体
１７を接着し、さらにこの透明弾性体１７の上面に拡散
フィルム１３を接着して配置する構成とする。In the fingerprint image input device 10 according to the second embodiment of the present invention, a transparent elastic body 17 made of a photocurable resin such as silicon is adhered to the upper surface of the light guide plate 11 which is a transparent parallel flat plate. The structure is such that the diffusion film 13 is adhered and arranged on the upper surface of the transparent elastic body 17.
【００３２】すなわち、このような本発明の第２実施形
態に係る指紋画像入力装置１０では、指Ｈの指紋面を透
明弾性体１７上の拡散フィルム１３に押圧接触させる
と、この接触面に対応するところの透明弾性体１７及び
拡散フィルム１３が指Ｈの曲面形状に馴染んで変形し、
指紋面の広範囲が光学画像の取り込み面に密着するよう
になるので、前記第１実施形態に係る指紋画像入力装置
に比べて、単に良好な指紋画像が得られるだけでなく、
指紋をより広範囲に良好な指紋画像として得ることがで
きる。That is, in the fingerprint image input device 10 according to the second embodiment of the present invention, when the fingerprint surface of the finger H is brought into pressure contact with the diffusion film 13 on the transparent elastic body 17, the fingerprint surface corresponds to the contact surface. Where the transparent elastic body 17 and the diffusion film 13 are adapted to the curved shape of the finger H and deformed,
Since a wide area of the fingerprint surface comes into close contact with the capturing surface of the optical image, not only a good fingerprint image is obtained, but also a better fingerprint image as compared with the fingerprint image input device according to the first embodiment,
A fingerprint can be obtained as a good fingerprint image over a wider range.
【００３３】なお、前記第２実施形態では、指Ｈの押圧
接触によりその指紋面の曲面に馴染んで変形する透明弾
性体１７を導光板１１の上面に配置し、この透明弾性体
１７の上面に拡散フィルム１３を接着配置することで、
より広範囲で良好な指紋画像を得る構成としたが、次の
第３実施形態（図３参照）において説明するように、導
光板１１の上面を予め指Ｈの形状に合わせた曲面部１１
ａとして形成し、前記同様にその上面に拡散フィルム１
３を接着配置してより広範囲で良好な指紋画像を得る構
成としてもよい。In the second embodiment, the transparent elastic body 17 which is adapted to the curved surface of the fingerprint surface by the pressing contact of the finger H is arranged on the upper surface of the light guide plate 11, and the transparent elastic body 17 is provided on the upper surface of the transparent elastic body 17. By bonding and disposing the diffusion film 13,
Although a good fingerprint image is obtained over a wider range, the curved surface portion 11 in which the upper surface of the light guide plate 11 is previously adjusted to the shape of the finger H as described in the following third embodiment (see FIG. 3).
a, and a diffusion film 1
3 may be adhered and arranged to obtain a good fingerprint image over a wider range.
【００３４】（第３実施形態）図３は本発明の第３実施
形態に係る指紋画像入力装置の構成を示す図である。(Third Embodiment) FIG. 3 is a diagram showing a configuration of a fingerprint image input device according to a third embodiment of the present invention.
【００３５】この本発明の第３実施形態に係る指紋画像
入力装置１０では、導光板１１の上面を、予め指Ｈの指
紋面の曲面に合わせたゆるやかな曲面部１１ａとして形
成し、さらにこの導光板１１の曲面部１１ａに拡散フィ
ルム１３を接着して配置する構成とする。In the fingerprint image input device 10 according to the third embodiment of the present invention, the upper surface of the light guide plate 11 is formed in advance as a gentle curved surface portion 11a conforming to the curved surface of the fingerprint surface of the finger H. The configuration is such that the diffusion film 13 is adhered to the curved surface portion 11a of the light plate 11 and disposed.
【００３６】すなわち、このような本発明の第３実施形
態に係る指紋画像入力装置１０では、指Ｈの指紋面の広
範囲が予め指Ｈの曲面形状に合わせて形成された導光板
１１上面の曲面部１１ａに対応する光学画像の取り込み
面に密着するようになるので、前記第１実施形態に係る
指紋画像入力装置に比べて、単に良好な指紋画像が得ら
れるだけでなく、また、前記第２実施形態に係る指紋画
像入力装置のように透明弾性体１７を用いる必要もな
く、簡単な構成で指紋をより広範囲に良好な指紋画像と
して得ることができる。That is, in the fingerprint image input device 10 according to the third embodiment of the present invention, a wide range of the fingerprint surface of the finger H is formed on the curved surface of the upper surface of the light guide plate 11 formed in advance in accordance with the curved shape of the finger H. Since it comes into close contact with the capturing surface of the optical image corresponding to the portion 11a, not only a good fingerprint image can be obtained but also the second image as compared with the fingerprint image input device according to the first embodiment. It is not necessary to use the transparent elastic body 17 unlike the fingerprint image input device according to the embodiment, and a fingerprint can be obtained as a good fingerprint image over a wider area with a simple configuration.
【００３７】なお、前記各実施形態では、導光板１１の
上面を照明光の拡散面とするために、該導光板１１の
（あるいは透明弾性体１７を介在した）上面に拡散フィ
ルム１３を接着して配置する構成としたが、導光板１１
（あるいは透明弾性体１７）の上表面を直接拡散剤を塗
布した拡散層として構成してもよく、さらには同表面を
拡散効果を有するマット加工面として構成してもよい。In each of the above embodiments, the diffusion film 13 is bonded to the upper surface of the light guide plate 11 (or the transparent elastic body 17 interposed) in order to make the upper surface of the light guide plate 11 a diffusion surface of illumination light. The light guide plate 11
The upper surface of the transparent elastic body 17 (or the transparent elastic body 17) may be formed as a diffusion layer directly coated with a diffusing agent, or the surface may be formed as a matte surface having a diffusion effect.
【００３８】また、前記各実施形態の指紋画像入力装置
１０における撮像レンズ１５は、屈折率分散型レンズで
あるセルフォックレンズ群によって構成してもよい。Further, the imaging lens 15 in the fingerprint image input device 10 of each of the above embodiments may be constituted by a selfoc lens group which is a refractive index dispersive lens.
【００３９】また、前記撮像素子１４は、ＣＣＤ以外に
ＣＭＯＳの２次元イメージセンサとしてもよく、さらに
は、平行移動機構を備えたＣＣＤやＣＭＯＳの１次元イ
メージセンサとして構成してもよい。The image pickup device 14 may be a CMOS two-dimensional image sensor other than the CCD, or may be a CCD or CMOS one-dimensional image sensor having a parallel moving mechanism.
【００４０】また、前記各実施形態の指紋画像入力装置
１０において、その光源として用いる蛍光管１２は、導
光板１１の一端面の斜め下方に配置してその照明光を入
射する構成としてもよく、さらに、蛍光管１２に代え
て、ＬＥＤを配置構成してもよい。In the fingerprint image input device 10 of each of the above embodiments, the fluorescent tube 12 used as the light source may be arranged diagonally below one end face of the light guide plate 11 to receive the illumination light. Further, instead of the fluorescent tube 12, an LED may be arranged.
【００４１】[0041]
【発明の効果】以上のように、本発明の請求項１に係る
指紋画像入力装置によれば、指の接触面となる導光板の
上面に拡散層を形成し、この拡散層に対して指の指紋面
を接触させることにより、その接触面内の指紋凸部に対
応する部分が拡散率の低下による暗部、非接触の指紋凹
部に対応する部分が明部となる指紋画像を、前記導光板
の下面側に対向配置した撮像素子に撮像させるので、指
紋凸部による乱反射の問題はなくなるようになる。As described above, according to the fingerprint image input device of the first aspect of the present invention, the diffusion layer is formed on the upper surface of the light guide plate which is the contact surface of the finger. By contacting the fingerprint surface of the light guide plate, a fingerprint image in which a portion corresponding to a fingerprint convex portion in the contact surface becomes a dark portion due to a decrease in diffusivity and a portion corresponding to a non-contact fingerprint concave portion becomes a bright portion, Since the image is picked up by the image pickup device arranged opposite to the lower surface side of the device, the problem of irregular reflection due to the fingerprint convex portion is eliminated.
【００４２】よって、導光板と接触する指紋凸部からの
乱反射が指紋凹部にも影響するなどの問題が生じること
なく、良好な指紋画像を得ることが可能になる。Therefore, it is possible to obtain a good fingerprint image without causing a problem that irregular reflection from a fingerprint convex portion in contact with the light guide plate affects a fingerprint concave portion.
【００４３】また、本発明の請求項２に係る指紋画像入
力装置によれば、指紋画像の読み取り面となる拡散層面
が、前記拡散層に対する指の押圧接触によってその指の
曲面に合わせて変形するので、前記指紋画像の読み取り
面となる拡散層面に対し、より広範囲な指紋面を歪み無
く密着できるようになる。According to the fingerprint image input device of the second aspect of the present invention, the surface of the diffusion layer serving as the reading surface of the fingerprint image is deformed to conform to the curved surface of the finger when the finger presses the diffusion layer. Therefore, a wider range of the fingerprint surface can be adhered to the diffusion layer surface serving as the fingerprint image reading surface without distortion.
【００４４】また、本発明の請求項３に係る指紋画像入
力装置によれば、指紋画像の読み取り面となる導光板上
の拡散層面が、指の指紋面に合わせて曲面形成された導
光板の上面に対応する曲面として設定されるので、前記
指紋画像の読み取り面となる拡散層面に対し、さらに広
範囲な指紋面を歪み無く密着できるようになる。Further, according to the fingerprint image input device of the third aspect of the present invention, the diffusion layer surface on the light guide plate serving as the fingerprint image reading surface has a curved surface formed in accordance with the fingerprint surface of the finger. Since the surface is set as a curved surface corresponding to the upper surface, a wider range of the fingerprint surface can be adhered to the diffusion layer surface serving as the fingerprint image reading surface without distortion.
【００４５】よって、指紋を広範囲に良好な指紋画像と
して得ることが可能になる。Therefore, it is possible to obtain a good fingerprint image over a wide range.
【図１】本発明の第１実施形態に係る指紋画像入力装置
の構成を示す図。FIG. 1 is a diagram showing a configuration of a fingerprint image input device according to a first embodiment of the present invention.
【図２】本発明の第２実施形態に係る指紋画像入力装置
の構成を示す図。FIG. 2 is a diagram showing a configuration of a fingerprint image input device according to a second embodiment of the present invention.
【図３】本発明の第３実施形態に係る指紋画像入力装置
の構成を示す図。FIG. 3 is a diagram showing a configuration of a fingerprint image input device according to a third embodiment of the present invention.
１０ …指紋画像入力装置 １１ …導光板 １１ａ…曲面部 １２ …蛍光管 １３ …拡散フィルム １４ …２次元イメージセンサ（ＣＣＤ） １５ …撮像レンズ １６ …遮光性筐体 １７ …透明弾性体 Ｈａ …指紋凸部 Ｈｂ …指紋凹部 DESCRIPTION OF SYMBOLS 10 ... Fingerprint image input device 11 ... Light guide plate 11a ... Curved surface part 12 ... Fluorescent tube 13 ... Diffusion film 14 ... Two-dimensional image sensor (CCD) 15 ... Imaging lens 16 ... Light shielding housing 17 ... Transparent elastic body Ha ... Fingerprint convex Part Hb: Fingerprint recess
Claims (3)
部に光を入射する光源と、 前記導光板の上面に形成され、当該導光板の内部に伝搬
された光を拡散する拡散層と、 前記導光板の下面に対向して配置された撮像素子と、 この撮像素子と前記導光板の下面との間に配置され、当
該導光板上面の前記拡散層により拡散された光を前記撮
像素子に結像させる撮像レンズとを備え、 前記拡散層の上面に指を接触した際に、その接触面内の
指紋凸部に対応する部分を暗部、非接触となる指紋凹部
に対応する部分を明部として指紋画像を撮像することを
特徴とする指紋画像入力装置。1. A light guide plate having a flat plate shape, a light source arranged corresponding to an end face of the light guide plate, and for entering light into the light guide plate; and a light source formed on an upper surface of the light guide plate, A diffusion layer for diffusing the light propagated therein; and an image sensor arranged opposite to the lower surface of the light guide plate; and an image sensor arranged between the image sensor and the lower surface of the light guide plate; An imaging lens that forms an image of the light diffused by the diffusion layer on the imaging device; and when a finger contacts the upper surface of the diffusion layer, a portion corresponding to a fingerprint convex portion in the contact surface is a dark portion. A fingerprint image input device, wherein a fingerprint image is picked up with a portion corresponding to a non-contact fingerprint concave portion as a bright portion.
押圧により変形する透明弾性体を介在し、この透明弾性
体の上面に形成されることを特徴とする請求項１に記載
の指紋画像入力装置。2. The light-emitting device according to claim 1, wherein the diffusion layer is formed on the upper surface of the light guide plate with a transparent elastic body that is deformed by pressing a finger, and formed on the upper surface of the transparent elastic body. Fingerprint image input device.
せた曲面形状に形成され、この曲面部の上面に前記拡散
層が形成されることを特徴とする請求項１に記載の指紋
画像入力装置。3. The fingerprint according to claim 1, wherein an upper surface of the light guide plate is formed in a curved shape corresponding to a fingerprint surface of the finger, and the diffusion layer is formed on an upper surface of the curved portion. Image input device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000315561A JP2002123822A (en) | 2000-10-16 | 2000-10-16 | Fingerprint image input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000315561A JP2002123822A (en) | 2000-10-16 | 2000-10-16 | Fingerprint image input device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002123822A true JP2002123822A (en) | 2002-04-26 |
Family
ID=18794647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000315561A Abandoned JP2002123822A (en) | 2000-10-16 | 2000-10-16 | Fingerprint image input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002123822A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004223263A (en) * | 2003-01-22 | 2004-08-12 | Nokia Corp | Sensor body and mobile terminal device including the sensor body |
| JP2007072942A (en) * | 2005-09-09 | 2007-03-22 | Chuan-Liang Industrial Co Ltd | Fingerprint recognition assembly using reflection for recognizing fingerprint pattern |
| WO2012102000A1 (en) * | 2011-01-27 | 2012-08-02 | Ｎｅｃエンジニアリング株式会社 | Image reading device |
| JP2012525614A (en) * | 2009-04-27 | 2012-10-22 | モルフォ | A device that identifies a person by their finger / palmprint |
| WO2014101003A1 (en) * | 2012-12-26 | 2014-07-03 | 大连恒锐科技股份有限公司 | Pressure-sensing light and shadow imaging system and method for processing footprint image formed by the system |
| WO2021132605A1 (en) * | 2019-12-27 | 2021-07-01 | 国立大学法人 東京大学 | Optical sensor |
| WO2022224916A1 (en) * | 2021-04-19 | 2022-10-27 | 合同会社画像技術研究所 | Biological information acquisition device |
-
2000
- 2000-10-16 JP JP2000315561A patent/JP2002123822A/en not_active Abandoned
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004223263A (en) * | 2003-01-22 | 2004-08-12 | Nokia Corp | Sensor body and mobile terminal device including the sensor body |
| JP2007072942A (en) * | 2005-09-09 | 2007-03-22 | Chuan-Liang Industrial Co Ltd | Fingerprint recognition assembly using reflection for recognizing fingerprint pattern |
| JP2012525614A (en) * | 2009-04-27 | 2012-10-22 | モルフォ | A device that identifies a person by their finger / palmprint |
| CN103348378B (en) * | 2011-01-27 | 2016-06-29 | 日本电气工程株式会社 | Image-reading device |
| WO2012102000A1 (en) * | 2011-01-27 | 2012-08-02 | Ｎｅｃエンジニアリング株式会社 | Image reading device |
| CN103348378A (en) * | 2011-01-27 | 2013-10-09 | 日本电气工程株式会社 | Image reading device |
| US20130300852A1 (en) * | 2011-01-27 | 2013-11-14 | Tetsuichiro Yamamoto | Image reading device |
| EP2669863A4 (en) * | 2011-01-27 | 2016-12-07 | Nippon Electric Eng | Image reading device |
| WO2014101003A1 (en) * | 2012-12-26 | 2014-07-03 | 大连恒锐科技股份有限公司 | Pressure-sensing light and shadow imaging system and method for processing footprint image formed by the system |
| US9390483B2 (en) * | 2012-12-26 | 2016-07-12 | Dalian Everspry Sci & Tech Co., Ltd. | Processing method of pressure-sensitive light and shadow imaging system and formed footprint image |
| US20150254821A1 (en) * | 2012-12-26 | 2015-09-10 | Dailian Everspry Sci & Tech Co., Ltd. | Processing method of pressure-sensitive light and shadow imaging system and formed footprint image |
| WO2021132605A1 (en) * | 2019-12-27 | 2021-07-01 | 国立大学法人 東京大学 | Optical sensor |
| WO2022224916A1 (en) * | 2021-04-19 | 2022-10-27 | 合同会社画像技術研究所 | Biological information acquisition device |
| JPWO2022224916A1 (en) * | 2021-04-19 | 2022-10-27 | ||
| JP7253298B2 (en) | 2021-04-19 | 2023-04-06 | 合同会社画像技術研究所 | Biometric information acquisition device |
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