JPS6329303B2 - - Google Patents

Info

Publication number
JPS6329303B2
JPS6329303B2 JP59240638A JP24063884A JPS6329303B2 JP S6329303 B2 JPS6329303 B2 JP S6329303B2 JP 59240638 A JP59240638 A JP 59240638A JP 24063884 A JP24063884 A JP 24063884A JP S6329303 B2 JPS6329303 B2 JP S6329303B2
Authority
JP
Japan
Prior art keywords
transparent plate
finger
image
fingerprint image
fingerprint
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.)
Expired
Application number
JP59240638A
Other languages
Japanese (ja)
Other versions
JPS60114979A (en
Inventor
Akira Tsuboi
Fuminobu Furumura
Koichi Ihara
Shigeo Shiono
Takanari Hayashi
Koichi Pponma
Mitsutaka Kosaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP59240638A priority Critical patent/JPS60114979A/en
Publication of JPS60114979A publication Critical patent/JPS60114979A/en
Publication of JPS6329303B2 publication Critical patent/JPS6329303B2/ja
Granted legal-status Critical Current

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  • Image Input (AREA)
  • Collating Specific Patterns (AREA)

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、人間の指から、指紋像を直接入力し
電気信号に変換し出力する指紋入力装置に関す
る。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fingerprint input device that directly inputs a fingerprint image from a human finger, converts it into an electrical signal, and outputs it.

〔発明の背景〕[Background of the invention]

人間の指から、指紋像を直接入力するためには
第1図に示すごとく、指1と、指を支える透明板
2(プリズム等)と、これらを支える支持台3、
光源4、画像センサ5が必要である。
In order to directly input a fingerprint image from a human finger, as shown in FIG.
A light source 4 and an image sensor 5 are required.

ところで、第1図に示す従来技術には次の問題
点がある。
By the way, the conventional technique shown in FIG. 1 has the following problems.

透明板2が支持台3に固定されているため、無
意識の内に透明板の上に置かれた指に、透明板の
面内一次元方向ならびに面内回転方向の力が加わ
り、この結果、得られる指紋像は一次元方向や回
転方向の湾曲歪をもつたことである。
Since the transparent plate 2 is fixed to the support base 3, force is applied to the finger unconsciously placed on the transparent plate in one-dimensional direction and rotational direction within the plane of the transparent plate, and as a result, The obtained fingerprint image has curvature distortion in one-dimensional direction and rotational direction.

〔発明の目的〕[Purpose of the invention]

したがつて、本発明の目的は、上記した従来技
術の欠点をなくし、湾曲歪の少ない指紋像を正面
像として入力する指紋入力装置を提供することに
ある。
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a fingerprint input device that inputs a fingerprint image with little curvature distortion as a front image.

〔発明の概要〕 上記の目的を達成するため、第2図を原理とす
る指紋入力装置を発明した。1は指である。2は
透明板、3は、透明板を支える支持台、7は、透
明板に対し、支持台水平方向のなめらかな平行移
動が回転運動を許すための潤滑装置である。8
は、透明板に指を置かない状態の場合に、透明板
を本体に対し定位置に保つためのバネである。本
発明では、良好な潤滑装置7と必要最小限のバネ
定数を有するバネ8の採用により、透明板は、水
平方向に関して自由支持の状態となつている。こ
の結果、従来、透明板に指を押しつけると指が受
けていた何らかの水平方向ならびに水平回転方向
の力は解放され、指表皮の湾曲歪が大幅に軽減さ
れ、湾曲歪の少ない指紋像が得られる。
[Summary of the Invention] In order to achieve the above object, a fingerprint input device based on the principle shown in FIG. 2 was invented. 1 is a finger. 2 is a transparent plate; 3 is a support base for supporting the transparent plate; and 7 is a lubricating device for allowing smooth parallel movement of the support plate in the horizontal direction to rotate the transparent plate. 8
is a spring that keeps the transparent plate in a fixed position relative to the main body when no finger is placed on the transparent plate. In the present invention, by employing a good lubricating device 7 and a spring 8 having a necessary minimum spring constant, the transparent plate is freely supported in the horizontal direction. As a result, some horizontal and horizontal rotational forces that were previously applied to the finger when it was pressed against the transparent plate are released, and the curvature distortion of the finger skin is significantly reduced, making it possible to obtain a fingerprint image with less curvature distortion. .

また、透明板2の内側表面での光の反射は、指
紋像のコントラストを著しく低下させる。これを
防止し良好なコントラストを得るため、本発明で
は、透明板の光源側の面にコーテイング層(図示
せず)を設けることが不可欠である。
Furthermore, the reflection of light on the inner surface of the transparent plate 2 significantly reduces the contrast of the fingerprint image. In order to prevent this and obtain good contrast, it is essential in the present invention to provide a coating layer (not shown) on the light source side surface of the transparent plate.

なお、正面像を得るため、光源からの光は、透
明板に対し垂直に照射されるものとする。これは
以下の実施例で示すごとくハーフミラーを用いる
ことにより容易に実現できる。
Note that in order to obtain a front image, the light from the light source is irradiated perpendicularly to the transparent plate. This can be easily realized by using a half mirror as shown in the following embodiment.

〔発明の実施例〕[Embodiments of the invention]

第3図は本発明の一実施例である。4は、光源
であり、5は指紋像を電気信号に変換する画像セ
ンサである。7は、ハーフミラーである。
FIG. 3 shows an embodiment of the present invention. 4 is a light source, and 5 is an image sensor that converts a fingerprint image into an electrical signal. 7 is a half mirror.

光源4から発した光は、ハーフミラー7で反射
し、透明板2に至る。透明板2の内側にはコーテ
イング層(図示せず)があり、光の大部分はこの
面で反射することなく透過し、透明板1の外側表
面に至る。この光は、透明板と指が密着する隆線
部分では透明板の外部表面で反射することなく指
に至り吸収されてしまう。この結果、透明板の内
側から指をのぞくと隆線は暗く見える。一方、隆
線と隆線の間の谷の部分は、透明板と接触しな
い。このため光は、透明板の外側表面で、一部反
射する。この結果、この谷の部分は、明るく見え
る。このようにして、コントラストの高い指紋像
が得られる。この像は、ハーフミラーで光量の半
分を失うが、残りの半分は画像センサ5に至り、
電気信号に変換される。
The light emitted from the light source 4 is reflected by the half mirror 7 and reaches the transparent plate 2. There is a coating layer (not shown) on the inside of the transparent plate 2, and most of the light passes through this surface without being reflected and reaches the outer surface of the transparent plate 1. This light reaches the finger and is absorbed without being reflected by the external surface of the transparent plate at the ridge portion where the finger is in close contact with the transparent plate. As a result, when you look at your finger from inside the transparent plate, the ridges appear dark. On the other hand, the valley portion between the ridges does not contact the transparent plate. Therefore, some of the light is reflected from the outer surface of the transparent plate. As a result, this valley part appears bright. In this way, a fingerprint image with high contrast is obtained. This image loses half of its light intensity due to the half mirror, but the remaining half reaches the image sensor 5.
converted into an electrical signal.

指をのせた透明板が静止状態にあるときは、水
平方向と水平回転方向の力は指にかかつていない
という透明板と支持台の間に理想ころがりに近い
状態を実現するため、本実施例では、潤滑装置と
してボールベアリングを用いている。これを第3
−b,c図に示す。第3−b図は、第3−a図の
断面A−Aにおける断面図である。第3−c図は
第3−b図の断面B−Bにおける断面図である。
本ベアリングは、工作の容易さを考慮して第3−
b図のごとく円形となつている。透明板も同様に
円形である。バネ8は板バネである。以上の結
果、湾曲歪の少ない指紋像が得られる。また、得
られた指紋像は、正面像であることは明白であ
る。
In order to achieve a state close to the ideal rolling between the transparent plate and the support base, in which when the transparent plate on which the finger is placed is in a stationary state, no force is applied to the finger in the horizontal direction or the horizontal rotation direction, this embodiment In this case, a ball bearing is used as a lubricating device. This is the third
- Shown in figures b and c. Figure 3-b is a sectional view taken along section A-A in Figure 3-a. FIG. 3-c is a sectional view taken along section BB in FIG. 3-b.
This bearing is designed with a 3-
It is circular as shown in figure b. The transparent plate is also circular. Spring 8 is a leaf spring. As a result of the above, a fingerprint image with less curvature distortion can be obtained. Furthermore, it is clear that the obtained fingerprint image is a frontal image.

〔発明の効果〕〔Effect of the invention〕

以下に本発明の要点をまとめる。 The main points of the present invention are summarized below.

(1) 透明板のなめらかな水平、回転運動を許した
ことにより、透明板が静止しているときに透明
板から指が受ける力は、垂直方向のみとなり、
湾曲歪の少ない指紋像が得られる。
(1) By allowing smooth horizontal and rotational movement of the transparent plate, when the transparent plate is stationary, the force that the finger receives from the transparent plate is only in the vertical direction.
A fingerprint image with little curvature distortion can be obtained.

(2) 片面コーテイング平面透明板とハーフミラー
の組合せにより、高いコントラストの指紋像を
正面像として得られる。
(2) By combining a single-sided coated flat transparent plate and a half mirror, a high-contrast fingerprint image can be obtained as a frontal image.

なお、必らずしも正面像を必要としない場合に
は、第4図に示す実施例により、より一層、簡単
な構造かつ高いコントラストの画像を得ることが
できる。ここで、透明板2′には、直角プリズム
2″がその中央部に固定されている。
Incidentally, when a front image is not necessarily required, an image with an even simpler structure and higher contrast can be obtained by the embodiment shown in FIG. Here, a right angle prism 2'' is fixed to the transparent plate 2' at its center.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、従来例説明図、第2図は、本発明の
原理図、第3,4図は本発明の一実施例である。 2……透明板(片側コーテイング平面板)、3
……支持台、4……光源、5……画像センサ、9
……案内板、7……ハーフミラー、8……板バ
ネ、9……潤滑装置。
FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is a diagram of the principle of the present invention, and FIGS. 3 and 4 are an embodiment of the present invention. 2...Transparent plate (flat plate coated on one side), 3
...Support stand, 4...Light source, 5...Image sensor, 9
... Guide plate, 7 ... Half mirror, 8 ... Leaf spring, 9 ... Lubrication device.

Claims (1)

【特許請求の範囲】[Claims] 1 透明板と、該透明板をその面に平行に回転運
動可能に保持する手段と、該透明板に当てられた
指の指紋を撮像する装置とを有することを特徴と
する指紋入力装置。
1. A fingerprint input device comprising: a transparent plate; means for holding the transparent plate rotatably in parallel to its surface; and a device for capturing an image of a fingerprint of a finger placed on the transparent plate.
JP59240638A 1984-11-16 1984-11-16 Finger print input device Granted JPS60114979A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59240638A JPS60114979A (en) 1984-11-16 1984-11-16 Finger print input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59240638A JPS60114979A (en) 1984-11-16 1984-11-16 Finger print input device

Publications (2)

Publication Number Publication Date
JPS60114979A JPS60114979A (en) 1985-06-21
JPS6329303B2 true JPS6329303B2 (en) 1988-06-13

Family

ID=17062473

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59240638A Granted JPS60114979A (en) 1984-11-16 1984-11-16 Finger print input device

Country Status (1)

Country Link
JP (1) JPS60114979A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05101168A (en) * 1990-08-30 1993-04-23 Maurer Identifikationssyst Gmbh Fingerprint identification device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941696A1 (en) 1998-03-03 1999-09-15 Siemens Aktiengesellschaft Fingertipsensor with integrated bushbutton switch

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5477499A (en) * 1977-10-25 1979-06-20 Schiller Michael Device for treating finger print

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5477499A (en) * 1977-10-25 1979-06-20 Schiller Michael Device for treating finger print

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05101168A (en) * 1990-08-30 1993-04-23 Maurer Identifikationssyst Gmbh Fingerprint identification device

Also Published As

Publication number Publication date
JPS60114979A (en) 1985-06-21

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