【発明の詳細な説明】〔概要〕指紋を登録したり、すでに登録されている指紋と照合す
るために、指紋像を入力する装置に関し、結像レンズを
導光体と一体化した指紋像入力装置において、導光体と
結像レンズとの一体成型が容易でかつコストダウンが可
能な装置を実現することを目的とし、指紋像入力部を有する導光体の端部に結像レンズを一体
形成すると共に、該指紋像入力部と結像レンズ部との間の光路中において
、指紋像入力部から到来した光を該結像レンズ側に反射
させる全反射面を有し、該全反射面は、前記結像レンズ
の曲面の曲率中心部に配設されている構成とする。[Detailed Description of the Invention] [Summary] This invention relates to a device for inputting a fingerprint image in order to register a fingerprint or to compare it with an already registered fingerprint. In order to realize a device in which the light guide and the imaging lens can be easily integrally molded and the cost can be reduced, the imaging lens is integrated into the end of the light guide that has the fingerprint image input section. a total reflection surface that reflects light arriving from the fingerprint image input section toward the imaging lens in an optical path between the fingerprint image input section and the imaging lens section; is arranged at the center of curvature of the curved surface of the imaging lens.
本発明は、指紋を登録したり、すでに登録されている指
紋と照合するために、指紋像を入力する装置に関する。The present invention relates to a device for inputting a fingerprint image in order to register a fingerprint or compare it with an already registered fingerprint.
近年、電子計算機が社会全般に普及するのに伴い、安全
性（セキュリティ）を如何に確保するかという点に世間
の関心が集まっている。例えば、電算機室への入室や端
末機利用の際の本人確認の手段として、ＩＤカードや暗
証番号が用いられてきたが、安全確保の面から多くの疑
問が提起されている。これに対して指紋は、「万人不同
」「終生不変」という三大特徴を持つため、本人確認の
最も有力な手段と考えられ、指紋を用いた簡便な個人照
合システムに関連して、多くの研究開発が行われている
。In recent years, as electronic computers have become widespread throughout society, public interest has been focused on how to ensure safety (security). For example, ID cards and PIN numbers have been used to verify identity when entering a computer room or using a terminal, but many questions have been raised from the perspective of ensuring safety. Fingerprints, on the other hand, are considered the most powerful means of identity verification because they have the three main characteristics of being ``unique for all people'' and ``unchanging throughout life.'' Research and development is underway.
このように個人の識別法として、指紋の照合を行うシス
テムにおいては、指紋を画像として取り扱うのが通常で
、指紋を画像データに変換する入力装置が必要となる。As described above, in a system that performs fingerprint verification as a personal identification method, the fingerprint is usually treated as an image, and an input device for converting the fingerprint into image data is required.
指紋は凹凸パターンであり、この凹凸パターンの検出、
認識は、第４図に示すような原理で行なわれる。１は透
明平板から成る導光体であり、指先２の指紋部分を、導
光体１の指紋像入力部９に押し当てると、指紋の凸部（
隆線部）は接触するが凹部（谷線）は接触しない。Fingerprints have a concave-convex pattern, and detection of this concave-convex pattern
Recognition is performed on the principle shown in FIG. Reference numeral 1 denotes a light guide made of a transparent flat plate, and when the fingerprint part of the fingertip 2 is pressed against the fingerprint image input section 9 of the light guide 1, the convex part of the fingerprint (
The ridges (ridges) touch, but the depressions (valleys) do not.
光源３によって、導光体ｌ中に光を入射して、指紋を押
し当てた平面に対し光を照射すると、光は指表面・内部
で反射散乱される。指の凹部からの散乱光は、−度空気
中を通り導光体１に入射するため、導光体１中を全反射
し伝播する成分は存在しない。ところが、凸部からの反
射・散乱光は、指から直接導光体１中に球面波として入
射し、その一部は導光体１中での全反射条件を満足し、
導光体１中を全反射を繰り返し伝播してゆく。この全反
射成分を、適当な光学系４で結像させ、イメージセンサ
５で検出すると、凸部（隆線）パターンの像を得ること
が出来る。When the light source 3 enters light into the light guide l and irradiates the plane against which the fingerprint is pressed, the light is reflected and scattered on the finger surface and inside. Since the scattered light from the concave part of the finger passes through the air by -degrees and enters the light guide 1, there is no component that is totally reflected and propagated in the light guide 1. However, the reflected and scattered light from the convex portion directly enters the light guide 1 from the finger as a spherical wave, and a part of it satisfies the condition for total reflection in the light guide 1.
The light propagates through the light guide 1 through repeated total reflection. When this total reflection component is imaged by a suitable optical system 4 and detected by an image sensor 5, an image of a convex part (ridge) pattern can be obtained.
この装置では、各光学素子が分離しているため、光学系
が大形になると共に、光路中において空気とガラス間の
界面のように屈折率の異なる面が多く、収差が大きい。In this device, since each optical element is separated, the optical system becomes large and there are many surfaces with different refractive indexes in the optical path, such as the interface between air and glass, resulting in large aberrations.
第５図は指紋像入力装置の構成を小型化かつ簡素化する
と共に収差を少なくするために、導光体１の端部に単一
球面レンズ６を貼り合わせた構造に成っている。FIG. 5 shows a structure in which a single spherical lens 6 is bonded to the end of the light guide 1 in order to downsize and simplify the configuration of the fingerprint image input device and to reduce aberrations.
指紋の凸部からの反射・散乱光は球面波であるため、単
一の球面レンズを用いて収差の少ない結像をさせるには
、第５図のように凸レンズ６の曲率中心に、開口絞り７
を配設することが有効であり、本発明の出願人から特願
昭６３−１５５６７０号として提案されている。なお８
は、指紋像入力部９がら到来した光を、単一球面レンズ
６側に導くミラーである。Since the reflected and scattered light from the convex part of a fingerprint is a spherical wave, in order to form an image with little aberration using a single spherical lens, an aperture stop is placed at the center of curvature of the convex lens 6 as shown in Figure 5. 7
It is effective to provide the following, and this was proposed by the applicant of the present invention in Japanese Patent Application No. 155670/1983. Note 8
is a mirror that guides the light coming from the fingerprint image input unit 9 to the single spherical lens 6 side.
しかしながら、この光学系では、導光体１の内部に開口
絞り７が有るため、導光体１に対して、開口絞り７、単
一球面レンズ６の順に貼り合わせることで製造せざるを
えず、導光体１と単一球面レンズ６との一体成型が難し
く、製造コストも高くなる。However, in this optical system, since the aperture stop 7 is located inside the light guide 1, the aperture stop 7 and the single spherical lens 6 must be bonded to the light guide 1 in this order. However, it is difficult to integrally mold the light guide 1 and the single spherical lens 6, and the manufacturing cost is also high.
本発明の技術的課題は、このように結像レンズを導光体
と一体化した指紋像入力装置において、導光体と結像レ
ンズとの一体成型が容易でかつコストダウンが可能な装
置を実現することにある。The technical problem of the present invention is to provide a fingerprint image input device in which an imaging lens is integrated with a light guide as described above, in which the light guide and the imaging lens can be easily integrally molded and the cost can be reduced. It's about making it happen.
第１図は本発明による指紋像入力装置の基本原理を説明
する図である。１は導光体であり、指紋像入力部９を有
し、かつ端部に結像レンズ１０が一体形成されている。FIG. 1 is a diagram illustrating the basic principle of a fingerprint image input device according to the present invention. Reference numeral 1 denotes a light guide, which has a fingerprint image input section 9 and an imaging lens 10 integrally formed at its end.
指紋像入力部９と結像レンズ部１０との間の光路中にお
いて、指紋像入力部９から到来した光を該結像レンズ１
０側に反射させる全反射面１１を有している。この全反
射面１１は、前記結像レンズ１０の曲面の曲率中心部に
配設されている。In the optical path between the fingerprint image input section 9 and the imaging lens section 10, the light coming from the fingerprint image input section 9 is transferred to the imaging lens 1.
It has a total reflection surface 11 that reflects the light toward the 0 side. This total reflection surface 11 is arranged at the center of curvature of the curved surface of the imaging lens 10.
〔作用］指紋像入力部９において指紋の凸部から反射した光は、
全反射を繰り返して、全反射面１１に到達し、かつ結像
レンズｌＯによって、イメージセンサ５などの検出面に
結像する。[Function] The light reflected from the convex part of the fingerprint in the fingerprint image input section 9 is
Through repeated total reflection, the light reaches the total reflection surface 11, and is imaged on the detection surface of the image sensor 5 or the like by the imaging lens IO.
全反射面１１は、結像レンズ１０の曲面の曲率中心部に
配設されているため、指紋像入力部９から到来し、全反
射面１１で結像レンズｌｏ側に全反射されて、検出面に
到達する光は、結像の際の収差が少ない。Since the total reflection surface 11 is disposed at the center of curvature of the curved surface of the imaging lens 10, the fingerprint image comes from the fingerprint image input section 9, is totally reflected by the total reflection surface 11 toward the imaging lens lo side, and is detected. The light that reaches the surface has less aberration during imaging.
指紋像入力部９と結像レンズ１０との間の光路は、導光
体１によって一体となっており、空間は存在しないため
、屈折率の変化する箇所は存在せず、この点からも収差
が減少する。The optical path between the fingerprint image input section 9 and the imaging lens 10 is unified by the light guide 1, and there is no space, so there is no place where the refractive index changes, and from this point of view, there is no aberration. decreases.
また導光体１の外面に指紋像入力部９、結像レンズ１０
および全反射面１１が配設されているため、すべて一体
成型が可能となる。Furthermore, a fingerprint image input section 9 and an imaging lens 10 are provided on the outer surface of the light guide 1.
and a total reflection surface 11, all of which can be integrally molded.
〔実施例］次に本発明による指紋像入力装置が実際上どのように具
体化されるかを実施例で説明する。第２図は本発明の第
一実施例を示す側面図である。導光体１の外面には、指
紋像入力部９と結像レンズ１０を有しており、かつ指紋
像入力部９から結像レンズ１０に到る光路の途中に、全
反射面１１を有している。[Example] Next, how the fingerprint image input device according to the present invention is actually implemented will be explained using an example. FIG. 2 is a side view showing a first embodiment of the present invention. The light guide 1 has a fingerprint image input section 9 and an imaging lens 10 on its outer surface, and has a total reflection surface 11 along the optical path from the fingerprint image input section 9 to the imaging lens 10. are doing.
全反射面１１は、結像レンズ１０の曲面の曲率中心部に
配設されているが、この全反射面１１の周囲の領域１２
は、導光体表面を粗して粗面化しである。そのため、指
紋像入力部９から到来した光のうち、粗面部１２に到来
した光は散乱され、結像レンズ１０に入射しない。した
がって、結像レンズ１０の曲面の曲率中心部に到来した
光のみが全反射面１１で反射されて、結像レンズ１０を
透過し、検出面に結像する。The total reflection surface 11 is arranged at the center of curvature of the curved surface of the imaging lens 10, and the area 12 around this total reflection surface 11
The surface of the light guide is roughened. Therefore, of the light that has arrived from the fingerprint image input section 9, the light that has arrived at the rough surface section 12 is scattered and does not enter the imaging lens 10. Therefore, only the light that reaches the center of curvature of the curved surface of the imaging lens 10 is reflected by the total reflection surface 11, passes through the imaging lens 10, and forms an image on the detection surface.
第３図は本発明の第二実施例を示す側面図である。この
実施例における導光体１は、２か所で光路が９０°屈曲
している。そして、指紋像入力部９と結像レンズｌＯと
の間において、指紋像入力部９、全反射ミラー１３、全
反射面１１、結像レンズ１０の順に配設されている。指
紋像入力部９から結像レンズ１０までが一体成型され、
全反射面１１の周囲は、粗面部１２と成っている。なお
、全反射面１１は、粗面部１２のうち、結像レンズ１（
１０曲面の曲率中心部のみ粗面を設けないで、開口とす
ることで形成されている。FIG. 3 is a side view showing a second embodiment of the present invention. In the light guide 1 in this embodiment, the optical path is bent at 90 degrees at two places. The fingerprint image input section 9, the total reflection mirror 13, the total reflection surface 11, and the imaging lens 10 are arranged in this order between the fingerprint image input section 9 and the imaging lens 1O. Everything from the fingerprint image input section 9 to the imaging lens 10 is integrally molded,
The periphery of the total reflection surface 11 is a rough surface portion 12 . In addition, the total reflection surface 11 includes the imaging lens 1 (of the rough surface portion 12).
Only the center of curvature of the ten curved surfaces is formed by forming an opening without providing a rough surface.
この装置において、指先２を指紋像入力部９に押し当て
ると、指紋の凸部は導光体１に接触するが凹部は接触し
ない。In this device, when the fingertip 2 is pressed against the fingerprint image input section 9, the convex portions of the fingerprint come into contact with the light guide 1, but the concave portions do not.
そのため、導光体１を通して、指先２を押し当てた指紋
像入力部９に対し光を照射すると、光は指表面・内部で
反射散乱される。指の凹部からの散乱光は、−度空気中
を通り導光体１に入射するため、導光体１中を全反射し
、伝播する成分は存在しない。ところが、凸部からの反
射・散乱光は、指から直接導光体ｌ中に球面波として入
射し、その一部は導光体１中での全反射条件を満足し、
導光体１中を全反射を繰り返し伝播していく。Therefore, when light is irradiated through the light guide 1 to the fingerprint image input section 9 against which the fingertip 2 is pressed, the light is reflected and scattered on the surface and inside of the finger. Since the scattered light from the concave part of the finger passes through the air at -degrees and enters the light guide 1, it is totally reflected in the light guide 1, and there is no component that propagates. However, the reflected and scattered light from the convex portion directly enters the light guide l from the finger as a spherical wave, and a part of it satisfies the condition for total reflection in the light guide l.
The light propagates through the light guide 1 through repeated total reflection.
そして、粗面部１２の中央に形成された全反射面１１に
達すると、凸レンズ１０の曲面の曲率中心部を通る光線
のみが全反射され、残りの光は粗面１２が有るために散
乱される。When reaching the total reflection surface 11 formed at the center of the rough surface portion 12, only the light rays passing through the center of curvature of the curved surface of the convex lens 10 are totally reflected, and the remaining light is scattered due to the presence of the rough surface 12. .
なお、全反射面１１を結像レンズ１０の曲率中心部のみ
に形成するには、周囲の領域１２を粗面化することのほ
か、光の吸収性に富んだ塗料などを塗布してもよい。Note that in order to form the total reflection surface 11 only at the center of curvature of the imaging lens 10, in addition to roughening the surrounding area 12, a paint with high light absorption may be applied. .
〔発明の効果］以上のように本発明によれば、収差を解消するために、
結像レンズの曲率中心部に到来した光のみを結像レンズ
側に導く手段として、曲率中心部に全反射面１１を設け
、かつ導光体１の外面に配設している。そのため、指紋
像入力部９から結像レンズ１０に到るまで全てを導光体
１と一体成型でき、その結果、製造が容易で、製造コス
トの低廉化が可能となる。[Effects of the Invention] As described above, according to the present invention, in order to eliminate aberrations,
As a means for guiding only the light that has arrived at the center of curvature of the imaging lens toward the imaging lens, a total reflection surface 11 is provided at the center of curvature and is disposed on the outer surface of the light guide 1. Therefore, everything from the fingerprint image input section 9 to the imaging lens 10 can be integrally molded with the light guide 1, and as a result, manufacturing is easy and manufacturing costs can be reduced.
第１図は本発明による指紋像人力装置の基本原理を説明
する図、第２図は本発明の第一実施例を示す側面図、第
３図は本発明の第二実施例を示す側面図、第４図は従来
の指紋像入力装置を示す側面図、第５図は従来の一体型
の指紋像入力装置を示す断面図である。図において、１は導光体、２は指先、６は単一球面レン
ズ、７は開口絞り、９は指紋像入力部、１０は結像レン
ズ、Ｒは結像レンズの曲率半径、１１は全反射面、１２
は粗面部、Ｉ３はミラー面をそれぞれ示す。特許出願人 冨士通株式会社復代理人 弁理士 福 島 康 文４＼発旦日１７）ｆｃ、オｑ弊工甲素１図ζ案ｇ −ｘし与を匠イを坤」Fig. 1 is a diagram explaining the basic principle of the fingerprint image human power device according to the present invention, Fig. 2 is a side view showing the first embodiment of the invention, and Fig. 3 is a side view showing the second embodiment of the invention. 4 is a side view showing a conventional fingerprint image input device, and FIG. 5 is a sectional view showing a conventional integrated fingerprint image input device. In the figure, 1 is a light guide, 2 is a fingertip, 6 is a single spherical lens, 7 is an aperture stop, 9 is a fingerprint image input section, 10 is an imaging lens, R is the radius of curvature of the imaging lens, and 11 is a total reflective surface, 12
indicates a rough surface portion, and I3 indicates a mirror surface. Patent applicant Fujitsu Co., Ltd. sub-agent Patent attorney Yasushi Fukushima 4\Issuance date 17)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63317747AJP2602082B2 (en) | 1988-12-16 | 1988-12-16 | Fingerprint image input device |
| FI893028AFI893028A7 (en) | 1988-06-23 | 1989-06-20 | Device for detecting data from an uneven surface |
| CA000603337ACA1319433C (en) | 1988-06-23 | 1989-06-20 | Uneven-surface data detection apparatus |
| EP89306276AEP0348182B1 (en) | 1988-06-23 | 1989-06-22 | Uneven-surface data detection apparatus |
| DE68924929TDE68924929T2 (en) | 1988-06-23 | 1989-06-22 | Device for data acquisition from uneven surfaces. |
| KR1019890008709AKR920010481B1 (en) | 1988-06-23 | 1989-06-23 | Uneven surface data detecting apparatus |
| US07/370,768US4924085A (en) | 1988-06-23 | 1989-06-23 | Uneven-surface data detection apparatus |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63317747AJP2602082B2 (en) | 1988-12-16 | 1988-12-16 | Fingerprint image input device |
| Publication Number | Publication Date |
|---|---|
| JPH02161931Atrue JPH02161931A (en) | 1990-06-21 |
| JP2602082B2 JP2602082B2 (en) | 1997-04-23 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63317747AExpired - Fee RelatedJP2602082B2 (en) | 1988-06-23 | 1988-12-16 | Fingerprint image input device |
| Country | Link |
|---|---|
| JP (1) | JP2602082B2 (en) |
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| US6870946B1 (en) | 1998-08-06 | 2005-03-22 | Secugen Corporation | Compact optical fingerprint capturing and recognition system |
| US6917695B2 (en) | 1998-11-12 | 2005-07-12 | Secugen Corporation | High contrast, low distortion optical acquisition system for image capturing |
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| US8675660B2 (en) | 2010-12-16 | 2014-03-18 | International Business Machines Corporation | Selection of receive-queue based on packet attributes |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6870946B1 (en) | 1998-08-06 | 2005-03-22 | Secugen Corporation | Compact optical fingerprint capturing and recognition system |
| US6917695B2 (en) | 1998-11-12 | 2005-07-12 | Secugen Corporation | High contrast, low distortion optical acquisition system for image capturing |
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| US8675660B2 (en) | 2010-12-16 | 2014-03-18 | International Business Machines Corporation | Selection of receive-queue based on packet attributes |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |