JPH08305832A - Fingerprint input device - Google Patents
Fingerprint input deviceInfo
- Publication number
- JPH08305832A JPH08305832A JP7112728A JP11272895A JPH08305832A JP H08305832 A JPH08305832 A JP H08305832A JP 7112728 A JP7112728 A JP 7112728A JP 11272895 A JP11272895 A JP 11272895A JP H08305832 A JPH08305832 A JP H08305832A
- Authority
- JP
- Japan
- Prior art keywords
- fingerprint
- input device
- electrode
- fingerprint input
- capacitance
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Collating Specific Patterns (AREA)
- Image Input (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は指紋入力装置に関し、さ
らに詳しくは指紋の凹凸に関わる静電容量の違いを検出
することによって、電気的に指紋画像パターンを得る指
紋入力装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fingerprint input device, and more particularly to a fingerprint input device which electrically obtains a fingerprint image pattern by detecting a difference in electrostatic capacitance related to unevenness of a fingerprint.
【０００２】[0002]
【従来の技術】指紋照合による個人識別は、犯罪走査の
手段のみならず、犯罪防止や安全性向上のために簡便で
信頼性の高いセキュリティチェックの手段として重要な
位置を占めている。例えば、各種ゲートの入退室チェッ
クや、バンキングシステム、コンピュータシステム、大
型のセーフティボックス等のＩＤとして、比較的大きな
システムでは既に適用され始めている。一方、携帯電話
やＰＤＡ等のパーソナル機器が発達するにつれ、盗用防
止の目的で指紋照合利用の期待が高まってきている。2. Description of the Related Art Personal identification by fingerprint collation occupies an important position not only as a means for crime scanning but also as a simple and highly reliable security check means for crime prevention and safety improvement. For example, it has already begun to be applied to relatively large systems as IDs for checking entrance / exit of various gates, banking systems, computer systems, large safety boxes, and the like. On the other hand, with the development of personal devices such as mobile phones and PDAs, there is an increasing expectation of using fingerprint collation for the purpose of preventing theft.
【０００３】図４は従来から広く利用されている指紋入
力装置の基本構成であって、カメラ１０２によって光学
的に指紋１１０を撮像する。一般に指紋自体のコントラ
ストは小さいので、プリズム１０１を用い、光源１０３
とカメラ１０２を光路分離法と呼ばれる位置に配置し、
指紋の谷線部分の全反射光と指紋の隆線部分からの散乱
光のＳ／Ｎが強調されるようにする。これらの構成は例
えば特開昭５５−１３４４６号公報に詳述されている。FIG. 4 shows a basic structure of a fingerprint input device which has been widely used in the past. The camera 102 optically picks up a fingerprint 110. Generally, the contrast of the fingerprint itself is small, so the prism 101 is used and the light source 103
And the camera 102 at a position called the optical path separation method,
The S / N ratio of the total reflection light at the valley portion of the fingerprint and the scattered light from the ridge portion of the fingerprint is emphasized. These structures are described in detail, for example, in JP-A-55-13446.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、照合用
指紋を入力するための従来の指紋入力装置は、体積、重
量とも大きく、また、経済的にも高価であって、パーソ
ナル機器の一機能として付加することは現実には困難で
あった。However, the conventional fingerprint input device for inputting the collation fingerprint is large in volume and weight, is economically expensive, and is added as a function of the personal device. It was difficult to do in reality.
【０００５】すなわち、図４で示した従来から広く利用
されている指紋入力装置の構成から解るように、光学的
に撮像する手法では、比較的大きなプリズムやカメラレ
ンズが必要で、かつそれらと光源とを３次元的に配置す
る必要があり、必然的に装置は大きく重くなる。これま
で、小型化の狙いとした種々の工夫もこらされてきた
が、それでもパーソナル機器に適合した寸法を実現する
ことは困難であった。また、精密な光学的位置合わせな
どの高度な組立工数も多く、部品点数も多いことから経
済化にも限界があった。That is, as can be seen from the structure of the fingerprint input device which has been widely used in the past, as shown in FIG. 4, the optical image pickup method requires a relatively large prism and a camera lens, and those and the light source. And 3 need to be arranged three-dimensionally, which inevitably makes the device large and heavy. Up to now, various efforts have been made to reduce the size, but it is still difficult to realize a size suitable for a personal device. In addition, since there are many advanced assembling steps such as precise optical alignment and the number of parts is large, there is a limit to economical efficiency.
【０００６】本発明は以上の問題点を解決するためにな
されたもので、その目的は、小型、薄形、軽量で経済化
しやすい指紋入力装置を提供することにある。The present invention has been made to solve the above problems, and an object of the present invention is to provide a fingerprint input device which is small in size, thin in shape, light in weight, and easy to be economical.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の指紋入力装置においては、指紋を接触ない
し近接させるべき主平面の表面上に配列された電極と、
該電極の各々に接続され該電極の静電容量を検出する回
路とを具備し、前記主平面に指紋を接触ないし近接され
たときに検出された前記電極毎の静電容量の大小によっ
て指紋の隆線と谷線の画像パターンを得ることを特徴と
する。In order to achieve the above object, in a fingerprint input device of the present invention, electrodes arranged on the surface of a main plane on which a fingerprint is brought into contact with or in proximity to,
A circuit connected to each of the electrodes for detecting the electrostatic capacitance of the electrode, wherein the fingerprint is detected according to the magnitude of the electrostatic capacitance of each electrode detected when the fingerprint is brought into contact with or brought close to the main plane. The feature is that an image pattern of ridges and valleys is obtained.
【０００８】上記の指紋入力装置においては、主平面に
接触ないし近接させる指紋を予め所定の電位に設定する
手段を有する構成とするのが、好適である。In the above fingerprint input device, it is preferable that the fingerprint input device has a means for setting a fingerprint to be brought into contact with or close to the principal plane to a predetermined potential in advance.
【０００９】また、上記の指紋入力装置における主平面
の表面上に配列された電極の各々は、格子状に互いに交
差する選択用の配線群と信号読み出し用の配線群、およ
び、それらの各交差点に配置された選択手段を有し、前
記電極の静電容量を検出する回路は前記信号読み出し用
の配線群に接続され、前記選択用の配線群による選択手
段の時分割駆動により前記電極を時分割で選択して前記
信号読み出し用の配線群に接続する構成とするのが、好
適である。Further, each of the electrodes arranged on the surface of the main plane in the above fingerprint input device has a wiring group for selection and a wiring group for signal reading which intersect each other in a grid pattern, and their respective intersections. A circuit for detecting the electrostatic capacitance of the electrode is connected to the signal read wiring group, and the electrode is timed by the time division drive of the selection means by the selection wiring group. It is preferable to adopt a configuration in which it is selected by division and is connected to the signal read wiring group.
【００１０】さらに、上記の指紋入力装置においては、
少なくとも前記主平面の表面上に配列された電極の上に
保護膜を形成するのが、好適である。Further, in the above fingerprint input device,
It is preferable to form a protective film on at least the electrodes arranged on the surface of the main plane.
【００１１】[0011]
【作用】本発明の指紋入力装置では、指紋を接触ないし
近接させるべき主平面に対し、指紋パターンの凹凸に応
じて静電容量が異なることを利用して、その凹凸に応じ
た静電容量を、主平面上に細かく配列された電極を用い
て電気的に検出することにより、大型で、高価になる光
学的な指紋パターンの入力手段をなくして、小型、薄
型、軽量で低価格に構成可能とする。In the fingerprint input device of the present invention, the electrostatic capacitance corresponding to the unevenness is utilized by utilizing that the electrostatic capacitance is different depending on the unevenness of the fingerprint pattern with respect to the main plane on which the fingerprint is brought into contact or approach. , By electrically detecting using finely arranged electrodes on the main plane, large and expensive optical fingerprint pattern input means can be eliminated, and small, thin, lightweight and low cost configuration is possible. And
【００１２】[0012]
【実施例】以下、本発明の一実施例を、図面を用いて詳
細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.
【００１３】まず、本発明の原理を説明する。図１は本
発明の指紋入力の原理を示す図であって、１１は指紋を
接触ないし近接させるべき平面（主平面と呼ぶ）であ
り、１２はその表面上に多数配列、形成された電極であ
る。各電極１２の寸法はすべて同じで、指紋パターンの
線幅よりも小さく形成する。各電極１２には、電極１２
に関わる静電容量を計測するための静電容量検出回路１
３を接続する。本図の例では、静電容量検出回路１３を
各電極に１個づつ接続し、全電極の容量を同時に検出す
ることとしているが、少数の静電容量検出回路１３を設
置し、Ｘ、Ｙ配線やスイッチ回路を用いて電極を順次走
査する等により時分割で使用することも可能である。こ
の構成と作用についての詳細は図２の実施例で説明す
る。First, the principle of the present invention will be described. FIG. 1 is a diagram showing the principle of fingerprint input according to the present invention. Reference numeral 11 is a plane (referred to as a main plane) on which a fingerprint is brought into contact with or brought close to, and 12 is an electrode formed in a large number on the surface thereof. is there. All the electrodes 12 have the same dimensions and are formed smaller than the line width of the fingerprint pattern. Each electrode 12 has an electrode 12
Capacitance detection circuit 1 for measuring the capacitance related to
Connect 3. In the example of this figure, one capacitance detection circuit 13 is connected to each electrode and the capacitances of all the electrodes are detected at the same time. However, a small number of capacitance detection circuits 13 are installed and X, Y It is also possible to use them in a time-sharing manner by sequentially scanning the electrodes using wiring or a switch circuit. Details of this structure and operation will be described in the embodiment of FIG.
【００１４】始めに、指紋を近づけない場合には、電極
１２に関わる静電容量はほとんど零であり、静電容量検
出回路１３は配線などに関わる小さな寄生コンデンサ１
４の容量Ｃ１４を検出するのみである。次に、前記主平
面１１に指紋を接触ないし近接させると、前記電極１２
と指紋の皮膚との距離１７を間隙とする空気コンデンサ
１５が形成され、静電容量検出回路１３はその静電容量
Ｃ１５を検出する。静電容量Ｃ１５の大きさは距離１７
に反比例するので、各電極１２の静電容量の分布は、皮
膚の凹凸を反映する。指紋の谷線１８は隆線１９に比べ
１０〜５０μｍ凹んでいるので、隆線１９部分では静電
容量は大きく、谷線１８部分では小さくなる。各電極１
２のピッチを指紋の線幅、即ち１００〜５００μｍより
充分小さくすれば、隆線１９部分と谷線１８部分の静電
容量が分離されて計測できるので、閾値静電容量との大
小比較によって指紋の隆線１９と谷線１８を識別するこ
とが可能となる。なお、電極１２と皮膚が接触し電気的
に導通した場合は、無限大の静電容量と見なすことが出
来る。First, when fingerprints are not brought close to each other, the electrostatic capacitance related to the electrode 12 is almost zero, and the electrostatic capacitance detection circuit 13 has a small parasitic capacitor 1 related to wiring or the like.
Only the capacitance C14 of 4 is detected. Next, when a fingerprint is brought into contact with or brought close to the main plane 11, the electrode 12
An air capacitor 15 having a distance 17 between the fingerprint and the skin of the fingerprint is formed, and the capacitance detection circuit 13 detects the capacitance C15. The capacitance C15 has a distance of 17
Since it is inversely proportional to, the distribution of the capacitance of each electrode 12 reflects the unevenness of the skin. Since the valley line 18 of the fingerprint is recessed by 10 to 50 μm as compared with the ridge line 19, the capacitance is large in the ridge line 19 portion and is small in the valley line 18 portion. Each electrode 1
If the pitch of 2 is made sufficiently smaller than the line width of the fingerprint, that is, 100 to 500 μm, the capacitances of the ridge line 19 and the valley line 18 can be separated and measured. It is possible to distinguish the ridge line 19 and the valley line 18 of the. It should be noted that when the electrode 12 and the skin come into contact with each other and become electrically conductive, it can be regarded as an infinite capacitance.
【００１５】以上の静電容量の分布測定を正確に行うた
めには、指紋の皮膚の電位が場所によらず同電位である
ことが必要である。また、毎回の指紋入力時に再現性よ
い結果を得るには、皮膚の電位が毎回同電位であること
も必要である。また、万が一高電位の指紋が接触するこ
とによって、静電容量検出回路１３が破損することも避
けねばならない。そのため、指紋を電極１２に近づける
前に充放電して一定電位とすることは、実用上重要な要
件である。その方法としては、例えば、予め一定電位の
別電極２０に接触してから、計測用の電極１２に近づけ
ることとすればよい。In order to accurately measure the distribution of electrostatic capacitance described above, it is necessary that the skin potential of the fingerprint is the same regardless of the location. Further, in order to obtain reproducible results at each fingerprint input, it is necessary that the skin potential is the same each time. It is also necessary to avoid damage to the capacitance detection circuit 13 due to contact with a fingerprint having a high potential. Therefore, it is a practically important requirement to charge and discharge the fingerprint to bring it to a constant potential before approaching the electrode 12. As a method thereof, for example, another electrode 20 having a constant potential may be contacted in advance and then brought closer to the measurement electrode 12.
【００１６】図２は本発明の一実施例を示す基本構成
図、図３はその具体的断面構成図である。FIG. 2 is a basic block diagram showing an embodiment of the present invention, and FIG. 3 is a specific sectional block diagram thereof.
【００１７】図２によれば、指紋を接触させる平面基板
２０１の表面上にＸ配線２０２、Ｙ配線２０３が格子状
に配線され、それぞれの交差点には選択用トランジスタ
２０４と静電容量生成用の電極２０５とが接続される。
Ｙ配線２０３は、選択用トランジスタ２０４のゲートに
接続され高電位のときに当該選択用トランジスタ２０４
を導通させる選択線であり、駆動回路２０８によって１
本ずつ順次高電位とすることによって全面を走査する。
Ｘ配線２０２は選択されたＹ配線２０３上の電極２０５
と、静電容量検出回路２０９とを電気的に接続する信号
読み出し線である。静電容量検出回路２０９の機能は例
えば次の様にすれば実現できる。始めに、すべてのＹ配
線２０３を低電位としてＸ配線２０２を高電位にプリチ
ャージする。次に、Ｙ配線２０３の１本を高電位とし選
択用トランジスタ２０４を導通すると、指紋と電極２０
５の静電容量２０６によってＸ配線２０２の電位は低下
する。この電圧変化量は電極２０５の静電容量とＸ配線
２０２の静電容量２０７との結合容量で決まるので、セ
ンス回路で増幅すれば電極２０５の静電容量として求め
ることができる。According to FIG. 2, X wirings 202 and Y wirings 203 are arranged in a grid pattern on the surface of a flat substrate 201 with which a fingerprint is brought into contact, and a selection transistor 204 and a capacitance generation capacitor are provided at respective intersections. The electrode 205 is connected.
The Y wiring 203 is connected to the gate of the selecting transistor 204, and when the potential is high, the selecting transistor 204 is connected.
Is a selection line for conducting
The entire surface is scanned by sequentially increasing the potential of each line.
The X wiring 202 is an electrode 205 on the selected Y wiring 203.
And a capacitance read circuit 209 is a signal read line for electrically connecting. The function of the electrostatic capacitance detection circuit 209 can be realized, for example, as follows. First, all the Y wirings 203 are set to low potential and the X wirings 202 are precharged to high potential. Next, when one of the Y wirings 203 is set to a high potential to make the selection transistor 204 conductive, the fingerprint and the electrode 20 are
The electrostatic capacitance 206 of 5 reduces the potential of the X wiring 202. This voltage change amount is determined by the coupling capacitance between the electrostatic capacitance of the electrode 205 and the electrostatic capacitance 207 of the X wiring 202, and thus can be obtained as the electrostatic capacitance of the electrode 205 by amplifying it in the sense circuit.
【００１８】次に、指紋の凹凸の検出について説明す
る。始めに、すべてのＹ配線２０３を高電位にして選択
用トランジスタ２０４を導通し、すべての電極２０５を
放電する。次に、指紋を平面基板２０１に接触ないし近
接させると、各電極２０５と指紋の皮膚の間には空気コ
ンデンサ２０６が生じた状態となる。このとき、指紋の
皮膚が入力面全体で同電位であり、かつ毎回の入力毎に
も同電位となるように、予め一定電圧の電極等（図示省
略）に接触して放電してから接触ないし近接させる。次
に、Ｘ配線２０２を高電位にプリチャージし、続いて１
番目のＹ配線２０３を高電位にして、Ｘ配線２０２の電
圧低下を静電容量検出回路２０９で検出・増幅する。も
し電極２０５上が指紋の隆線２１０部分であれば、静電
容量Ｃ２１０は大きく、Ｘ配線２０２の電圧低下も大き
い。あるいは電極２０５上が指紋の谷線２１１部分や指
の外周部であれば、静電容量Ｃ２１１は小さく、Ｘ配線
２０２の電圧低下も小さい。それらの結果は、端子２１
５より外部に読み出され、１番目のＹ配線２０３に沿っ
た凹凸パターンとして画像メモリに蓄えられる。続い
て、再びＸ配線２０２をプリチャージし、２番目のＹ配
線２０３を高電位にして、静電容量を検出する。これら
の動作を全Ｙ配線２０３に対して行うことによって、指
紋全面の凹凸に対応した静電容量の分布パターンを画像
メモリに蓄えることができる。Next, the detection of the unevenness of the fingerprint will be described. First, all the Y wirings 203 are set to a high potential, the selection transistors 204 are made conductive, and all the electrodes 205 are discharged. Next, when the fingerprint is brought into contact with or brought close to the flat substrate 201, an air condenser 206 is formed between each electrode 205 and the skin of the fingerprint. At this time, in order that the skin of the fingerprint has the same electric potential on the entire input surface and also the same electric potential at every input, the electrode or the like (not shown) having a constant voltage is contacted in advance and then discharged. Bring them close together. Next, the X wiring 202 is precharged to a high potential, and then 1
The second Y wiring 203 is set to a high potential, and the voltage drop of the X wiring 202 is detected and amplified by the electrostatic capacitance detection circuit 209. If the electrode 205 is on the ridge 210 of the fingerprint, the capacitance C210 is large and the voltage drop of the X wiring 202 is also large. Alternatively, when the electrode 205 is on the valley portion 211 of the fingerprint or the outer peripheral portion of the finger, the capacitance C211 is small and the voltage drop of the X wiring 202 is also small. The results are terminal 21
5 is read out to the outside and is stored in the image memory as an uneven pattern along the first Y wiring 203. Subsequently, the X wiring 202 is precharged again, the second Y wiring 203 is set to a high potential, and the capacitance is detected. By performing these operations for all the Y wirings 203, it is possible to store the capacitance distribution pattern corresponding to the unevenness of the entire fingerprint surface in the image memory.
【００１９】次に、本実施例の具体的構成例を図３を用
いて説明する。図３は、シリコン基板上に形成した指紋
入力装置の断面構造図であり、３１０はシリコン基板、
３０２は金属薄膜で形成された凹凸検出用電極、３０３
はＭＯＳＦＥＴからなる選択用トランジスタで、そのゲ
ート３０４には上記Ｙ配線が、ソース３０５にはＸ配線
が、ドレイン３０６には電極３０２が接続される。３１
０は選択用トランジスタ３０２や電極３０３を傷やよご
れから保護するための保護膜で厚さ数μｍ以下の酸化シ
リコン膜で形成する。３１１は保護膜上に露出し接地さ
れたメッシュ電極で、指が接触することにより皮膚の電
位をアースレベルに固定する役目を果たす。このよう
に、電極３０２上に別の放電用電極を設置することによ
り、指の電荷を放電する操作と凹凸検出を同じ指紋入力
装置で同時に実現できる。Next, a specific example of the structure of this embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional structural view of a fingerprint input device formed on a silicon substrate, where 310 is a silicon substrate,
Reference numeral 302 denotes an unevenness detection electrode formed of a metal thin film, 303
Is a selection transistor including a MOSFET, the gate 304 of which is connected to the Y wiring, the source 305 of which is connected to the X wiring, and the drain 306 of which is connected to the electrode 302. 31
Reference numeral 0 is a protective film for protecting the selection transistor 302 and the electrode 303 from scratches and dirt, and is formed of a silicon oxide film having a thickness of several μm or less. Reference numeral 311 denotes a mesh electrode which is exposed on the protective film and is grounded, and plays the role of fixing the electric potential of the skin to the ground level when the finger comes into contact therewith. In this way, by disposing another discharge electrode on the electrode 302, the operation of discharging the electric charge of the finger and the detection of the unevenness can be simultaneously realized by the same fingerprint input device.
【００２０】本指紋入力装置は、図３から解るように現
行のシリコン集積回路技術を用いて容易に形成できる特
徴がある。また、本図には示していないがＹ配線の駆動
回路や静電容量検出回路等の周辺回路も、さらには画像
メモリや信号処理回路も同じシリコン集積回路技術を用
いて同一基板上に形成することができる。The fingerprint input device is characterized in that it can be easily formed by using the current silicon integrated circuit technology, as can be seen from FIG. Although not shown in the drawing, peripheral circuits such as a Y wiring drive circuit and a capacitance detection circuit, and also an image memory and a signal processing circuit are formed on the same substrate by using the same silicon integrated circuit technology. be able to.
【００２１】なお、本実施例ではシリコン基板とＭＯＳ
ＦＥＴを用いたが、スイッチング機能をもつ素子を形成
できる他の基板、アクティブ素子も利用可能である。た
とえば、ガラス等セラミック基板を用い、選択用トラン
ジスタとして薄膜トランジスタを用いること、あるい
は、トランジスタの代りにバリスタ、バック−バックダ
イオード等の非線形素子を用いて構成することも可能で
ある。In this embodiment, the silicon substrate and the MOS are
Although the FET is used, other substrates and active elements capable of forming an element having a switching function can also be used. For example, a ceramic substrate such as glass may be used, and a thin film transistor may be used as the selection transistor, or a non-linear element such as a varistor or a back-back diode may be used instead of the transistor.
【００２２】本発明の改良として、保護膜としてゴム状
の材料を用いたり、異方性導電膜を用いることも有効で
ある。ゴム状の材料は指紋の凹凸に追従して厚さが変形
するため、指を押し付けたときの指紋の歪み量が一定と
なり、再現性のよい凹凸測定を可能となる。また、誘電
率は空気よりも大きいので検出する静電容量が大きくな
り、精度の良い測定が可能となる。一方、保護膜として
厚さ方向に導電性のある異方性導電膜を用いると、電極
３０２と皮膚の間隔を接近できるので静電容量を大きく
でき、精度の良い測定が可能となる。As an improvement of the present invention, it is effective to use a rubber-like material as the protective film or an anisotropic conductive film. Since the thickness of the rubber-like material is deformed following the unevenness of the fingerprint, the amount of distortion of the fingerprint when the finger is pressed becomes constant, and the unevenness measurement with good reproducibility becomes possible. Moreover, since the dielectric constant is larger than that of air, the capacitance to be detected becomes large, which enables accurate measurement. On the other hand, when an anisotropic conductive film having a conductive property in the thickness direction is used as the protective film, the distance between the electrode 302 and the skin can be close, so that the capacitance can be increased and accurate measurement can be performed.
【００２３】[0023]
【発明の効果】以上述べたように、本発明の指紋入力装
置は、従来の指紋入力装置に用いられていた光学的撮像
技術を用いず、指紋の凹凸を静電容量の差で検出する原
理を用いてるので、原理的に平面状の装置として実現で
きるため、従来の指紋入力装置に比べて厚さ、体積、重
量とも大幅に削減できる利点がある。また、その製造方
法は集積回路形成技術で容易に一括して形成できるの
で、従来の指紋入力装置に比べ部品点数や、組立工程を
大幅に削減でき、経済化、高信頼化が達成できる利点が
ある。本発明によってパーソナル機器等の小型、経済化
が必須なシステムにも、指紋照合によるセキュリティ機
能を付加することが可能になる。As described above, the fingerprint input device of the present invention does not use the optical imaging technique used in the conventional fingerprint input device, but detects the unevenness of the fingerprint by the difference in capacitance. Since it can be realized as a planar device in principle, there is an advantage that thickness, volume, and weight can be significantly reduced as compared with a conventional fingerprint input device. Further, since the manufacturing method thereof can be easily collectively formed by the integrated circuit forming technique, the number of parts and the assembling process can be significantly reduced as compared with the conventional fingerprint input device, and there are advantages that economic efficiency and high reliability can be achieved. is there. According to the present invention, it is possible to add a security function by fingerprint collation to a system such as a personal device, which is essential to be small and economical.
【００２４】上記の指紋入力装置において、主平面に接
触ないし近接させる指紋を予め所定の電位に設定する手
段を設けた場合には、特に、指紋の皮膚の電位が毎回、
かつ皮膚の場所によらず一定の電位になるので、再現性
が良く、正確な指紋測定が可能になるとともに、高電位
の指紋による回路破壊等を防止できる。In the above fingerprint input device, when a means for setting a fingerprint to be brought into contact with or in proximity to the main plane to a predetermined potential in advance is provided, in particular, the potential of the skin of the fingerprint is
In addition, since the potential is constant regardless of the location on the skin, reproducibility is good, accurate fingerprint measurement is possible, and circuit breakage due to high potential fingerprint can be prevented.
【００２５】また、上記の指紋入力装置において、主平
面の表面上に配列された電極の各々を、格子状に配列し
た選択用の配線群と信号読み出し用の配線群、および、
それらの各交差点に配置した選択手段で、時分割で使用
するようにした場合には、特に、静電容量検出回路や配
線量が少なくなるなど、小型化に寄与できる。Further, in the above fingerprint input device, each of the electrodes arranged on the surface of the main plane is arranged in a grid pattern for selection and a wiring group for signal reading, and
When the selection means arranged at each of these intersections is used in a time-division manner, the capacitance detection circuit and the amount of wiring can be reduced, which can contribute to downsizing.
【００２６】さらに、前記主平面表面上に配列された電
極の上に保護膜を形成した場合には、特に、静電容量が
大きくなり、再現性の良い、あるいは精度の良い指紋測
定が可能になる。Further, when the protective film is formed on the electrodes arranged on the surface of the main plane, the electrostatic capacitance becomes particularly large, which enables fingerprint measurement with good reproducibility or accuracy. Become.
【図１】本発明の指紋入力装置の原理図である。FIG. 1 is a principle diagram of a fingerprint input device of the present invention.
【図２】本発明の実施例の基本構成図である。FIG. 2 is a basic configuration diagram of an embodiment of the present invention.
【図３】上記実施例の具体的構造図である。FIG. 3 is a specific structural diagram of the above embodiment.
【図４】従来の指紋入力装置の原理図である。FIG. 4 is a principle diagram of a conventional fingerprint input device.
１１…主平面 １２，２０５，３０２…電極 １３，２０９…静電容量検出回路 ２０４，３０３…選択用トランジスタ ２０２…Ｘ配線 ２０３…Ｙ配線 １８，２１１…谷線 １９，２１０…隆線 ２０…一定電位の電極 11 ... Main plane 12, 205, 302 ... Electrode 13, 209 ... Capacitance detection circuit 204, 303 ... Selection transistor 202 ... X wiring 203 ... Y wiring 18, 211 ... Valley line 19, 210 ... Ridge line 20 ... Constant Potential electrode
Claims (4)
の表面上に配列された電極と、 該電極の各々に接続され該電極の静電容量を検出する回
路とを具備し、 前記主平面に指紋を接触ないし近接されたときに検出さ
れた前記電極毎の静電容量の大小によって指紋の隆線と
谷線の画像パターンを得ることを特徴とする指紋入力装
置。1. A main surface is provided with electrodes arranged on the surface of a main plane on which a fingerprint is brought into contact with or in proximity to each other, and a circuit connected to each of the electrodes to detect capacitance of the electrodes. A fingerprint input device, wherein an image pattern of a ridge line and a valley line of a fingerprint is obtained according to the magnitude of the capacitance of each electrode detected when the fingerprint is brought into contact with or brought into proximity.
め所定の電位に設定する手段を有することを特徴とする
請求項１記載の指紋入力装置。2. The fingerprint input device according to claim 1, further comprising means for setting a fingerprint, which comes into contact with or comes close to the main plane, to a predetermined potential in advance.
は、格子状に互いに交差する選択用の配線群と信号読み
出し用の配線群、および、それらの各交差点に配置され
た選択手段を有し、 前記電極の静電容量を検出する回路は前記信号読み出し
用の配線群に接続され、 前記選択用の配線群による選択手段の時分割駆動により
前記電極を時分割で選択して前記信号読み出し用の配線
群に接続することを特徴とする請求項１または請求項２
記載の指紋入力装置。3. Each of the electrodes arranged on the surface of the main plane has a wiring group for selection and a wiring group for signal readout which intersect each other in a grid pattern, and a selection means arranged at each intersection thereof. A circuit for detecting the electrostatic capacitance of the electrode is connected to the signal read wiring group, and the electrode is time-divisionally selected by time-division driving of the selection means by the selection wiring group. 3. A signal reading wiring group is connected to the wiring group.
The fingerprint input device described.
れた電極の上に保護膜が形成されていることを特徴とす
る請求項１または請求項２または請求項３記載の指紋入
力装置。4. The fingerprint input device according to claim 1, wherein a protective film is formed on at least electrodes arranged on the surface of the main plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11272895A JP3418479B2 (en) | 1995-05-11 | 1995-05-11 | Fingerprint input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11272895A JP3418479B2 (en) | 1995-05-11 | 1995-05-11 | Fingerprint input device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08305832A true JPH08305832A (en) | 1996-11-22 |
| JP3418479B2 JP3418479B2 (en) | 2003-06-23 |
Family
ID=14594061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11272895A Expired - Fee Related JP3418479B2 (en) | 1995-05-11 | 1995-05-11 | Fingerprint input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3418479B2 (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0779497A3 (en) * | 1995-12-15 | 1998-03-04 | Lucent Technologies Inc. | Fingerprint acquisition sensor |
| JPH1119069A (en) * | 1997-07-02 | 1999-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Finger print recognition integrated circuit |
| JPH11513516A (en) * | 1995-10-06 | 1999-11-16 | カロ，ペテル | A detector for recognizing the pristine nature of a finger in a fingerprint recognizer |
| US6055324A (en) * | 1997-06-30 | 2000-04-25 | Nec Corporation | Fingerprint image entry device of electrostatic capacitance sensing type |
| US6234031B1 (en) | 1997-11-27 | 2001-05-22 | Nec Corporaion | Fingerprint detection apparatus |
| US6246566B1 (en) | 1999-02-08 | 2001-06-12 | Amkor Technology, Inc. | Electrostatic discharge protection package and method |
| WO2002065394A1 (en) * | 2001-02-15 | 2002-08-22 | Nec Corporation | Fingerpirnt image input device having display function |
| US6448790B1 (en) | 1999-10-26 | 2002-09-10 | Citizen Watch Co., Ltd. | Electrostatic capacitance detecting device |
| DE10110724A1 (en) * | 2001-03-06 | 2002-09-26 | Infineon Technologies Ag | Fingerprint sensor with potential modulation of the ESD protective grid |
| US6518560B1 (en) | 2000-04-27 | 2003-02-11 | Veridicom, Inc. | Automatic gain amplifier for biometric sensor device |
| US6538456B1 (en) | 1995-12-15 | 2003-03-25 | Veridicom, Inc. | Capacitive fingerprint sensor with adjustable gain |
| KR100378994B1 (en) * | 2000-11-07 | 2003-04-07 | 테스텍 주식회사 | Fingerprint Recognizing Device Having Patterned Floating Electrodes and Fabricating Method therefore |
| JP2004528572A (en) * | 2001-05-22 | 2004-09-16 | アトルア テクノロジーズ インコーポレイテッド | Surface capacitance sensor system using implantable stimulation electrodes |
| US7301744B2 (en) | 2002-04-23 | 2007-11-27 | Seiko Epson Corporation | Electronic equipment, driving method thereof and method of driving electronic circuit |
| JP2008539444A (en) * | 2005-04-27 | 2008-11-13 | ローホー，インコーポレイテッド | Proximity sensor |
| JP4828757B2 (en) * | 1999-11-26 | 2011-11-30 | プラッツ、カール−オットー | Capacitive sensor on transparent carrier |
| JP2012060175A (en) * | 2011-12-19 | 2012-03-22 | Fujitsu Semiconductor Ltd | Device and method for detecting substrate |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11513516A (en) * | 1995-10-06 | 1999-11-16 | カロ，ペテル | A detector for recognizing the pristine nature of a finger in a fingerprint recognizer |
| US6538456B1 (en) | 1995-12-15 | 2003-03-25 | Veridicom, Inc. | Capacitive fingerprint sensor with adjustable gain |
| EP0779497A3 (en) * | 1995-12-15 | 1998-03-04 | Lucent Technologies Inc. | Fingerprint acquisition sensor |
| US6055324A (en) * | 1997-06-30 | 2000-04-25 | Nec Corporation | Fingerprint image entry device of electrostatic capacitance sensing type |
| JPH1119069A (en) * | 1997-07-02 | 1999-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Finger print recognition integrated circuit |
| US6234031B1 (en) | 1997-11-27 | 2001-05-22 | Nec Corporaion | Fingerprint detection apparatus |
| US6246566B1 (en) | 1999-02-08 | 2001-06-12 | Amkor Technology, Inc. | Electrostatic discharge protection package and method |
| US6448790B1 (en) | 1999-10-26 | 2002-09-10 | Citizen Watch Co., Ltd. | Electrostatic capacitance detecting device |
| JP4828757B2 (en) * | 1999-11-26 | 2011-11-30 | プラッツ、カール−オットー | Capacitive sensor on transparent carrier |
| US6518560B1 (en) | 2000-04-27 | 2003-02-11 | Veridicom, Inc. | Automatic gain amplifier for biometric sensor device |
| KR100378994B1 (en) * | 2000-11-07 | 2003-04-07 | 테스텍 주식회사 | Fingerprint Recognizing Device Having Patterned Floating Electrodes and Fabricating Method therefore |
| WO2002065394A1 (en) * | 2001-02-15 | 2002-08-22 | Nec Corporation | Fingerpirnt image input device having display function |
| US7027625B2 (en) | 2001-03-06 | 2006-04-11 | Infineon Technologies Ag | Fingerprint sensor with potential modulation of the ESD protective grating |
| DE10110724A1 (en) * | 2001-03-06 | 2002-09-26 | Infineon Technologies Ag | Fingerprint sensor with potential modulation of the ESD protective grid |
| JP2004528572A (en) * | 2001-05-22 | 2004-09-16 | アトルア テクノロジーズ インコーポレイテッド | Surface capacitance sensor system using implantable stimulation electrodes |
| US7301744B2 (en) | 2002-04-23 | 2007-11-27 | Seiko Epson Corporation | Electronic equipment, driving method thereof and method of driving electronic circuit |
| US7616423B2 (en) | 2002-04-23 | 2009-11-10 | Seiko Epson Corporation | Electronic equipment, driving method thereof and method of driving electronic circuit |
| US8823610B2 (en) | 2003-08-29 | 2014-09-02 | Seiko Espon Corporation | Electronic circuit, method of driving the same, electronic device, electro-optical device, electronic apparatus, and method of driving the electronic device |
| JP2008539444A (en) * | 2005-04-27 | 2008-11-13 | ローホー，インコーポレイテッド | Proximity sensor |
| JP2012060175A (en) * | 2011-12-19 | 2012-03-22 | Fujitsu Semiconductor Ltd | Device and method for detecting substrate |
| WO2019033350A1 (en) * | 2017-08-17 | 2019-02-21 | 深圳信炜科技有限公司 | Display module and electronic device |
| WO2019033351A1 (en) * | 2017-08-17 | 2019-02-21 | 深圳信炜科技有限公司 | Photosensitive module, display module and electronic device |
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