JPH1115949A - Fingerprint input device - Google Patents
Fingerprint input deviceInfo
- Publication number
- JPH1115949A JPH1115949A JP9164018A JP16401897A JPH1115949A JP H1115949 A JPH1115949 A JP H1115949A JP 9164018 A JP9164018 A JP 9164018A JP 16401897 A JP16401897 A JP 16401897A JP H1115949 A JPH1115949 A JP H1115949A
- Authority
- JP
- Japan
- Prior art keywords
- light
- substrate
- film
- fingerprint
- prism
- 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.)
- Pending
Links
Landscapes
- Collating Specific Patterns (AREA)
- Image Input (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、指紋を登録した
り、既に登録されている指紋像との照合のために指紋像
を入力する指紋入力装置に関するものである。[0001] 1. Field of the Invention [0002] The present invention relates to a fingerprint input device for registering a fingerprint or inputting a fingerprint image for collation with a fingerprint image already registered.
【０００２】[0002]
【従来の技術】指紋は「万人不同」、「終生不変」とい
う特徴を持つため、指紋照合システムは特に高いセキュ
リティ性を求められる分野の個人照合システムとしても
用いられる。この指紋照合システムにおいて指紋像を入
力する装置は必須の構成要素である。この指紋入力装置
は、光学系で構成され、設置場所や使い勝手などの理由
により小型化が求められる。そこで、この指紋入力装置
の小型化を実現するために、光源として表面実装型ＬＥ
Ｄが採用される場合が多い。2. Description of the Related Art Since fingerprints have the characteristics of "everyone is unidentified" and "lifelong invariant", a fingerprint collation system is also used as a personal collation system particularly in a field where high security is required. In this fingerprint collation system, a device for inputting a fingerprint image is an essential component. This fingerprint input device is constituted by an optical system, and is required to be downsized for reasons such as installation location and usability. In order to reduce the size of the fingerprint input device, a surface mount type LE is used as a light source.
D is often adopted.
【０００３】図６は従来の指紋入力装置の要部を示す図
である。同図において、１はＬＥＤ（発光ダイオー
ド）、２はＬＥＤ１がその表面２Ｆに実装された基板、
３はプリズム、４は受光器である。この例では、光路分
離法を採用しており、ＬＥＤ１を実装してなる基板２を
プリズム３の下面側右側方に配置し、またプリズム３の
左側方面に黒色塗装（或いは遮光板）３−１を施し、Ｌ
ＥＤ１からの光をプリズム３の内部を通してその指紋採
取面Ａ−Ｂに照射する構成としている。この構成におい
て、指紋採取面Ａ−Ｂに置かれる指の紋様面にて反射し
たプリズム３からの出射光は、受光器４のレンズ４−１
を通して結像面（ＣＣＤ）４−２上に結像される。FIG. 6 is a diagram showing a main part of a conventional fingerprint input device. In the figure, 1 is an LED (light emitting diode), 2 is a substrate on which LED 1 is mounted on its surface 2F,
3 is a prism and 4 is a light receiver. In this example, the optical path separation method is adopted, the substrate 2 on which the LEDs 1 are mounted is disposed on the right side on the lower surface side of the prism 3, and the left side surface of the prism 3 is painted black (or a light shielding plate) 3-1. And L
Light from the ED 1 passes through the inside of the prism 3 and irradiates the fingerprint collecting surface AB. In this configuration, the light emitted from the prism 3 reflected by the pattern of the finger placed on the fingerprint collection surface AB is transmitted to the lens 4-1 of the light receiver 4.
The image is formed on an imaging plane (CCD) 4-2 through
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の指紋入力装置によると、ＬＥＤ１の側面や背
面での光の漏れが大きく、すなわちＬＥＤ１の側面や背
面からの光がプリズム３への入射光とならず、指紋採取
面Ａ−Ｂへの照明効率が悪い。指紋照合システムの照合
精度の良し悪しは指紋像が正しく入力できるか否かに大
きく依存する。このため、指紋採取面Ａ−Ｂへの照明効
率が悪くなると、照合精度が落ちる。また、ＬＥＤ１の
側面や基板２を透過してその裏面２Ｒから漏れ出た光が
迷光となり、ＣＣＤ４−２上に結像される指紋像にノイ
ズとして入り込む。これにより、指紋像の品質が損ねら
れ、照合精度が落ちる。なお、基板２の裏面側に図示点
線で示すような反射鏡５を設けて、ＬＥＤ１の側面や基
板２を透過してその裏面２Ｒから漏れ出た光をプリズム
３へ入射させるようにすることが考えられる。しかし、
このような方法では、部品点数が増え、コストアップと
なるばかりでなく、折角の小型化が阻害されてしまう。
また、この場合、基板２を透過してその裏面２Ｒから漏
れた出た光は、再度基板２を透過してプリズム３へ入射
されることになるため、すなわち基板２を２回通過する
ことになるため、光強度が落ちる。However, according to such a conventional fingerprint input device, light leakage from the side and the back of the LED 1 is large, that is, light from the side and the back of the LED 1 enters the prism 3. It does not become light, and the illumination efficiency on the fingerprint collection surface AB is poor. The quality of the verification accuracy of the fingerprint verification system largely depends on whether or not a fingerprint image can be input correctly. For this reason, if the illumination efficiency on the fingerprint collection plane AB is reduced, the matching accuracy is reduced. In addition, light that has passed through the side surface of the LED 1 or the substrate 2 and leaked from the rear surface 2R thereof becomes stray light, and enters the fingerprint image formed on the CCD 4-2 as noise. As a result, the quality of the fingerprint image is impaired, and the matching accuracy is reduced. A reflecting mirror 5 as shown by a dotted line in the drawing may be provided on the back surface of the substrate 2 so that light transmitted through the side surface of the LED 1 or the substrate 2 and leaking from the back surface 2R is incident on the prism 3. Conceivable. But,
Such a method not only increases the number of parts and increases the cost, but also hinders miniaturization of the angle.
Further, in this case, the light that has passed through the substrate 2 and leaked from the back surface 2R will again pass through the substrate 2 and be incident on the prism 3, that is, will pass through the substrate 2 twice. As a result, the light intensity decreases.
【０００５】本発明はこのような課題を解決するために
なされたもので、その目的とするところは、小型化を損
ねることなく、低コストで、照合精度を向上させること
のできる指紋入力装置を提供することにあるSUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a fingerprint input device capable of improving collation accuracy at low cost without impairing miniaturization. In providing
【０００６】[0006]
【課題を解決するための手段】このような目的を達成す
るために、第１発明（請求項１に係る発明）は、その一
方向面を指紋採取面として配置されたプリズムと、基板
の表面に実装されプリズムの内部を通してその指紋採取
面に光を照射する光源とを備えた指紋入力装置におい
て、光源が実装されている基板の表面に光反射率の高い
膜（反射膜）を形成したものである。この発明によれ
ば、光源の側面や背面から漏れた光が基板表面の反射膜
で反射され、プリズムへ入射される。In order to achieve such an object, a first invention (an invention according to claim 1) comprises a prism having a one-way surface as a fingerprint collection surface and a prism surface. Fingerprint input device having a light source mounted on a substrate and irradiating the fingerprint collecting surface with light through the interior of the prism, wherein a film having a high light reflectance (reflection film) is formed on the surface of the substrate on which the light source is mounted It is. According to the present invention, light leaked from the side surface or the back surface of the light source is reflected by the reflection film on the substrate surface and is incident on the prism.
【０００７】第２発明（請求項２に係る発明）は、その
一方向面を指紋採取面として配置されたプリズムと、基
板の表面に実装されプリズムの内部を通してその指紋採
取面に光を照射する光源とを備えた指紋入力装置におい
て、光源が実装されている基板の表面に光を遮光する膜
（遮光膜）を形成したものである。この発明によれば、
光源の側面や背面から漏れた光が基板表面の遮光膜で遮
光され、基板を透過してその裏面から漏れ出ることが防
がれる。According to a second invention (an invention according to claim 2), the prism is disposed on one side as a fingerprint collecting surface, and the fingerprint collecting surface is mounted on the surface of the substrate and irradiated with light through the inside of the prism. In a fingerprint input device including a light source, a film (light shielding film) for shielding light is formed on a surface of a substrate on which the light source is mounted. According to the invention,
Light leaking from the side surface or the back surface of the light source is shielded by the light-shielding film on the substrate surface, and is prevented from passing through the substrate and leaking from the back surface.
【０００８】第３発明（請求項３に係る発明）は、その
一方向面を指紋採取面として配置されたプリズムと、基
板の表面に実装されプリズムの内部を通してその指紋採
取面に光を照射する光源とを備えた指紋入力装置におい
て、光源が実装されている基板の表面に光反射率が高く
且つ光を遮光する膜（反射／遮光膜）を形成したもので
ある。この発明によれば、光源の側面や背面から漏れた
光が基板表面の反射／遮光膜で反射され、プリズムへ入
射される。また、光源の側面や背面から漏れた光が基板
表面の反射／遮光膜で遮光され、基板を透過してその裏
面から漏れ出ることが防がれる。According to a third invention (an invention according to claim 3), the prism is arranged on one side as a fingerprint collecting surface, and light is applied to the fingerprint collecting surface through the inside of the prism mounted on the surface of the substrate. In a fingerprint input device provided with a light source, a film (reflection / light shielding film) having a high light reflectance and shielding light is formed on a surface of a substrate on which the light source is mounted. According to the present invention, light leaking from the side surface or the back surface of the light source is reflected by the reflection / light-shielding film on the substrate surface and is incident on the prism. Further, light leaked from the side surface or the back surface of the light source is shielded by the reflection / light shielding film on the surface of the substrate, and is prevented from passing through the substrate and leaking from the back surface.
【０００９】[0009]
【発明の実施の形態】以下、本発明を実施の形態に基づ
き詳細に説明する。図１はこの発明の一実施の形態の要
部を示す図である。同図において、図６と同一符号は同
一或いは同等構成要素を示し、その説明は省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a diagram showing a main part of an embodiment of the present invention. 6, the same reference numerals as those in FIG. 6 denote the same or equivalent components, and a description thereof will be omitted.
【００１０】〔実施の形態１：第１発明〕この実施の形
態１では、基板２の表面２Ｆに、すなわちＬＥＤ１が実
装されている基板２の表面２Ｆに、光反射率の高い膜
（反射膜）２−１を形成する。[Embodiment 1: First Invention] In the first embodiment, a film having a high light reflectance (reflection film) is formed on the surface 2F of the substrate 2, that is, on the surface 2F of the substrate 2 on which the LED 1 is mounted. ) Form 2-1.
【００１１】図２は基板２への反射膜２−１の形成状況
を示し、同図（ａ）は平面図、同図（ｂ）は同図（ａ）
におけるＩ−Ｉ線断面図である。基板２の表面２Ｆに
は、金属膜をエッチングして電源用の電極パッドＰＡ，
ＰＢ、ＬＥＤ用の電極パッドＰ１1 ，Ｐ１2 、Ｐ２1 ，
Ｐ２2 、Ｐ３1 ，Ｐ３2 、Ｐ４1 ，Ｐ４2 、Ｐ５1 ，Ｐ
５2 、Ｐ６1 ，Ｐ６2 が形成されている。反射膜２−１
はこれらの電極パッドＰの形成部分を避けた全領域に形
成されている。FIG. 2 shows the state of formation of the reflection film 2-1 on the substrate 2, wherein FIG. 2 (a) is a plan view and FIG. 2 (b) is FIG.
FIG. 2 is a sectional view taken along line II in FIG. On the surface 2F of the substrate 2, a metal film is etched to form power supply electrode pads PA,
PB, LED electrode pads P11, P12, P21,
P22, P31, P32, P41, P42, P51, P
52, P61 and P62 are formed. Reflective film 2-1
Are formed in the entire region except for the portions where the electrode pads P are formed.
【００１２】反射膜２−１の形成方法としては塗布や印
刷などによる方法が考えられる。この実施の形態では、
塗料を白色としたスクリーン印刷で、反射膜２−１を基
板２の表面２Ｆに形成している。スクリーン印刷用白色
塗料の反射率はおよそ８０％であるため効率よく光を反
射することができる。また、白色塗料は拡散反射するた
め、指向性の少ない均一な光強度分布とすることが可能
である。また、基板２への素子記号等の印刷もスクリー
ン印刷で行っており、この印刷と同工程で反射膜２−１
を形成することができるため、コスト的に有利である。As a method of forming the reflection film 2-1, a method such as coating or printing can be considered. In this embodiment,
The reflection film 2-1 is formed on the surface 2F of the substrate 2 by screen printing using a white paint. Since the reflectance of the white paint for screen printing is about 80%, light can be efficiently reflected. Further, since the white paint diffusely reflects, it is possible to obtain a uniform light intensity distribution with less directivity. Also, the printing of element symbols and the like on the substrate 2 is performed by screen printing, and the reflection film 2-1 is formed in the same process as this printing.
Can be formed, which is advantageous in cost.
【００１３】基板２への反射膜２−１の形成後、図３に
示すように、ＬＥＤパッドＰ１1 ，Ｐ１2 に対してＬＥ
Ｄ１−１を、ＬＥＤパッドＰ２1 ，Ｐ２2 に対してＬＥ
Ｄ１−２を、ＬＥＤパッドＰ３1 ，Ｐ３2 に対してＬＥ
Ｄ１−３を、ＬＥＤパッドＰ４1 ，Ｐ４2 に対してＬＥ
Ｄ１−４を、ＬＥＤパッドＰ５1 ，Ｐ５2 に対してＬＥ
Ｄ１−５を、ＬＥＤパッドＰ６1 ，Ｐ６2 に対してＬＥ
Ｄ１−６を半田Ｆにより接続する。After forming the reflection film 2-1 on the substrate 2, as shown in FIG. 3, the LED pads P11 and P12 are LE
D1-1 is connected LE to LED pads P21 and P22.
D1-2 is connected to the LED pads P31 and P32 by LE.
D1-3 is connected LE to LED pads P41 and P42.
D1-4 is connected LE to LED pads P51 and P52.
D1-5 is connected LE to LED pads P61 and P62.
D1-6 is connected by solder F.
【００１４】これにより、ＬＥＤ１−１〜１−６の側面
や背面から漏れた光が基板２の表面２Ｆの反射膜２−１
で反射され、プリズム３へ入射されるものとなり、指紋
採取面Ａ−Ｂへの照明効率がよくなり、小型化を損ねる
ことなく、低コストで、照合精度が向上する。As a result, the light leaking from the side surfaces and the back surface of the LEDs 1-1 to 1-6 is reflected by the reflection film 2-1 on the front surface 2F of the substrate 2.
Then, the light is reflected by the prism 3 and is incident on the prism 3, so that the illumination efficiency on the fingerprint collecting surface AB is improved, and the collation accuracy is improved at a low cost without impairing the miniaturization.
【００１５】〔実施の形態２：第２発明〕この実施の形
態２では、ＬＥＤ１が実装されている基板２の表面２Ｆ
に、光を遮光する膜（遮光膜）２−１’を形成する。[Embodiment 2: Second Invention] In Embodiment 2, the surface 2F of the substrate 2 on which the LED 1 is mounted
Next, a film (light-shielding film) 2-1 ′ for shielding light is formed.
【００１６】この場合にも、実施の形態１と同様、遮光
膜２−１’はスクリーン印刷によって形成する。但し、
遮光膜２−１’としては、スクリーン印刷用黒色塗料を
用いる。遮光膜２−１’を黒色とすることにより、塗料
内部で光を吸収し、基板２の裏面２Ｒへの透過を防ぐこ
とができる。In this case, as in the first embodiment, the light-shielding film 2-1 'is formed by screen printing. However,
As the light shielding film 2-1 ′, a black paint for screen printing is used. By making the light-shielding film 2-1 ′ black, it is possible to absorb light inside the paint and prevent transmission to the back surface 2R of the substrate 2.
【００１７】これにより、ＬＥＤ１−１〜１−６の側面
や背面から漏れた光が基板２の表面２Ｆの遮光膜２−
１’で遮光され、基板２を透過してその裏面２Ｒから漏
れ出ることが防がれ、ＣＣＤ４−２上に結像される指紋
像にノイズとして入り込む迷光が少なくなり、指紋像の
品質が高められ、小型化を損ねることなく、低コスト
で、照合精度が向上する。As a result, light leaking from the side and back surfaces of the LEDs 1-1 to 1-6 is transmitted to the light-shielding film 2 on the front surface 2F of the substrate 2.
1 'prevents light from passing through the substrate 2 and leaking from the rear surface 2R thereof, and reduces the amount of stray light entering the fingerprint image formed on the CCD 4-2 as noise, thereby improving the quality of the fingerprint image. Thus, the matching accuracy is improved at a low cost without impairing the miniaturization.
【００１８】なお、遮光膜２−１’も反射膜２−１と同
様、電極パッドＰの形成部分を避けた全領域に形成する
が、ＬＥＤ１−１〜１−６の接着に影響のない程度に、
印刷部とパッド部とをオーバラップさせた方が光の漏れ
を除去でき、遮光性が高くなる。The light-shielding film 2-1 'is also formed in the entire region except for the portion where the electrode pad P is formed, similarly to the reflection film 2-1. However, the light-shielding film 2-1' does not affect the adhesion of the LEDs 1-1 to 1-6. To
When the printing section and the pad section overlap each other, light leakage can be removed, and light-shielding properties are enhanced.
【００１９】〔実施の形態３：第３発明〕この実施の形
態３では、ＬＥＤ１が実装されている基板２の表面２Ｆ
に、光反射率が高く且つ光を遮光する膜（反射／遮光
膜）２−１”を形成する。[Embodiment 3: Third invention] In Embodiment 3, the surface 2F of the substrate 2 on which the LED 1 is mounted is provided.
Then, a film (reflection / light-shielding film) 2-1 ″ having a high light reflectance and shielding light is formed.
【００２０】この場合にも、実施の形態１と同様、反射
／遮光膜２−１”はスクリーン印刷によって形成する。
但し、反射／遮光膜２−１”としては、スクリーン印刷
用白色塗料を用い、その膜厚を厚くする。白色塗料を厚
く印刷することにより、基板２の表面２Ｆでは、光が拡
散反射する。白色塗料内部での光の吸収率は低いが、厚
くすることにより光の吸収を大きくすることができるた
め、白色の塗料でも膜厚によって遮光を施すことが可能
となる。In this case, as in the first embodiment, the reflection / shielding film 2-1 "is formed by screen printing.
However, a white paint for screen printing is used as the reflection / light-shielding film 2-1 ″, and the thickness thereof is increased. By printing the white paint thickly, light is diffusely reflected on the surface 2F of the substrate 2. Although the light absorptance inside the white paint is low, the light absorption can be increased by increasing the thickness, so that even a white paint can be shaded by the film thickness.
【００２１】これにより、ＬＥＤ１−１〜１−６の側面
や背面から漏れた光が基板２の表面２Ｆの反射／遮光膜
２−１”で反射され、プリズム３へ入射されるものとな
り、指紋採取面Ａ−Ｂへの照明効率がよくなり、照合精
度が向上する。また、ＬＥＤ１−１〜１−６の側面や背
面から漏れた光が基板２の表面２Ｆの反射／遮光膜２−
１”で遮光され、基板２を透過してその裏面２Ｒから漏
れ出ることが防がれ、ＣＣＤ４−２上に結像される指紋
像にノイズとして入り込む迷光が少なくなり、指紋像の
品質が高められ、照合精度が向上する。As a result, the light leaking from the side and back surfaces of the LEDs 1-1 to 1-6 is reflected by the reflection / light-shielding film 2-1 ″ on the front surface 2F of the substrate 2 and is incident on the prism 3, so that the fingerprint is obtained. The efficiency of the illumination on the sampling plane AB is improved, and the collation accuracy is improved, and the light leaking from the side surfaces and the back surface of the LEDs 1-1 to 1-6 is reflected / shielded on the surface 2F of the substrate 2 by the light-shielding film 2-
1 "is shielded from light, and is prevented from passing through the substrate 2 and leaking from the back surface 2R thereof, thereby reducing the amount of stray light entering the fingerprint image formed on the CCD 4-2 as noise and improving the quality of the fingerprint image. And the matching accuracy is improved.
【００２２】なお、この実施の形態３でも実施の形態２
と同様、ＬＥＤ１−１〜１−６の接着に影響のない程度
に、印刷部とパッド部とをオーバラップさせた方が光の
漏れを除去でき、遮光性が高くなる。In the third embodiment, the second embodiment is also used.
Similarly to the case described above, when the printed portion and the pad portion overlap each other so as not to affect the adhesion of the LEDs 1-1 to 1-6, the leakage of light can be removed, and the light-shielding property increases.
【００２３】〔実施の形態４：第３発明〕実施の形態３
では反射／遮光膜２−１”をスクリーン印刷によって形
成するようにした。これに対してこの実施の形態４では
反射／遮光膜２−１”を金属膜で形成する。[Embodiment 4: Third invention] Embodiment 3
In this embodiment, the reflection / light-shielding film 2-1 "is formed by screen printing. On the other hand, in the fourth embodiment, the reflection / light-shielding film 2-1" is formed of a metal film.
【００２４】この場合、基板２の表面２Ｆへ電極パッド
ＰＡ，ＰＢ、Ｐ１1 ，Ｐ１2 〜Ｐ６1 ，Ｐ６2 をエッチ
ングによって形成する時に、各電極パッドＰの周囲に間
隙を設けてその外部に金属膜を残す（図４（ａ）参
照）。この残した金属膜を反射／遮光膜２−１”とす
る。In this case, when the electrode pads PA, PB, P11, P12 to P61, P62 are formed on the surface 2F of the substrate 2 by etching, a gap is provided around each electrode pad P to leave a metal film on the outside. (See FIG. 4A). The remaining metal film is referred to as a reflection / light-shielding film 2-1 ″.
【００２５】金属膜はその表面で光を効率よく反射す
る。また、光の透過がないので、遮光性を保つことがで
きる。したがって、反射／遮光膜２−１”を金属膜とし
たこの実施の形態４でも、実施の形態３と同様の効果を
得ることができる。The metal film reflects light efficiently on its surface. In addition, since there is no light transmission, light shielding properties can be maintained. Therefore, in the fourth embodiment in which the reflection / shielding film 2-1 ″ is a metal film, the same effect as in the third embodiment can be obtained.
【００２６】なお、図４（ａ）において、各パッドＰの
周囲に設けた間隙Ｇ（ＧＡ，ＧＢ，Ｇ１1 ，Ｇ１2 〜Ｇ
６1 ，Ｇ６2 ）には、白色塗料による厚めのスクリーン
印刷を施す。これにより、各パッドＰ間の絶縁を確実に
することができると共に遮光性を上げることができる。In FIG. 4A, gaps G (GA, GB, G11, G12 to G12) provided around each pad P are provided.
61, G62) is subjected to thick screen printing using white paint. Thereby, the insulation between the pads P can be ensured, and the light shielding property can be improved.
【００２７】〔実施の形態５：第１〜第３発明〕上述し
た実施の形態１〜４では光路分離法を採用した指紋入力
装置への適用例とし説明した。本発明は全反射法を採用
した指紋入力装置へも同様にして適用できる。全反射法
を採用した指紋入力装置では、図５に示すように、ＬＥ
Ｄ１を実装してなる基板２をプリズム３の下面側左側方
に配置し、ＬＥＤ１からの光を拡散板６を介しプリズム
３の内部を通して指紋採取面Ａ−Ｂに照射する構成とす
る。このような構成において、ＬＥＤ１が実装されてい
る基板２の表面２Ｆに、光路分離法を採用した指紋入力
装置の場合と同様にして、反射膜２−１や遮光膜２−
１’，反射／遮光膜２−１”を形成する。[Fifth Embodiment: First to Third Inventions] The first to fourth embodiments have been described as examples of application to a fingerprint input device employing an optical path separation method. The present invention can be similarly applied to a fingerprint input device employing the total reflection method. In a fingerprint input device employing the total reflection method, as shown in FIG.
The substrate 2 on which D1 is mounted is disposed on the lower left side of the lower surface of the prism 3, and the light from the LED 1 is applied to the fingerprint collecting surface AB through the inside of the prism 3 via the diffusion plate 6. In such a configuration, on the surface 2F of the substrate 2 on which the LED 1 is mounted, the reflection film 2-1 and the light-shielding film 2-
1 ′, a reflection / light-shielding film 2-1 ″ is formed.
【００２８】全反射法と光路分離法の原理については、
文献１（電子通信学会論文誌’８５／３ Ｖｏｌ．Ｊ６
８−Ｄ Ｎｏ３ ４１４〜４１５頁）に説明されている
ので、ここでの詳しい説明は省略する。全反射法では、
指紋の非接触部において全反射を生じさせ、かつ接触部
において全反射を生じさせないものとし、非接触部と接
触部からの光の差を検出する。光路分離法では、指紋の
非接触部からの光が全くない状態で、接触部からの光の
みを検出する。Regarding the principle of the total reflection method and the optical path separation method,
Reference 1 (Transactions of the Institute of Electronics and Communication Engineers '85 / 3 Vol. J6
8-D No. 3 pages 414 to 415), and a detailed description is omitted here. In the total reflection method,
It is assumed that total reflection occurs at the non-contact portion of the fingerprint and no total reflection occurs at the contact portion, and a difference between light from the non-contact portion and light from the contact portion is detected. In the optical path separation method, only light from a contact portion is detected without any light from a non-contact portion of the fingerprint.
【００２９】[0029]
【発明の効果】以上説明したことから明らかなように本
発明によれば、第１発明では、光源の側面や背面から漏
れた光が基板表面の反射膜で反射されプリズムへ入射さ
れるものとなり、指紋採取面への照明効率がよくなり、
小型化を損ねることなく、低コストで、照合精度が向上
する。第２発明では、光源の側面や背面から漏れた光が
基板表面の遮光膜で遮光され、基板を透過してその裏面
から漏れ出ることが防がれ、結像面上に結像される指紋
像にノイズとして入り込む迷光が少なくなり、指紋像の
品質が高められ、小型化を損ねることなく、低コスト
で、照合精度が向上する。第３発明では、光源の側面や
背面から漏れた光が基板表面の反射／遮光膜で反射され
プリズムへ入射されるものとなり、また、光源の側面や
背面から漏れた光が基板表面の反射／遮光膜で遮光さ
れ、基板を透過してその裏面から漏れ出ることが防が
れ、第１発明と第２発明の効果をあわせ持つことにな
る。As is apparent from the above description, according to the present invention, in the first invention, light leaked from the side surface or the back surface of the light source is reflected by the reflection film on the substrate surface and is incident on the prism. , Lighting efficiency on the fingerprint collection surface is improved,
The matching accuracy is improved at low cost without impairing the miniaturization. In the second invention, the light leaked from the side surface or the back surface of the light source is shielded by the light-shielding film on the substrate surface, is prevented from passing through the substrate and leaking from the back surface, and the fingerprint imaged on the imaging surface is formed. The amount of stray light entering the image as noise is reduced, the quality of the fingerprint image is improved, and the collation accuracy is improved at low cost without impairing miniaturization. In the third invention, light leaked from the side and back surfaces of the light source is reflected by the reflection / light-shielding film on the substrate surface and enters the prism, and light leaked from the side surface and back surface of the light source is reflected / reflected on the substrate surface. Light is shielded by the light-shielding film, and it is possible to prevent the light from passing through the substrate and leaking from the back surface thereof, thereby having the effects of the first invention and the second invention.
【図１】 本発明の一実施の形態の要部を示す図であ
る。FIG. 1 is a diagram showing a main part of an embodiment of the present invention.
【図２】 基板表面への反射膜（遮光膜，反射／遮光
膜）の形成状況を示す図である。FIG. 2 is a diagram showing a state of formation of a reflection film (light-shielding film, reflection / light-shielding film) on a substrate surface.
【図３】 反射膜（遮光膜，反射／遮光膜）が形成され
た基板表面へのＬＥＤの実装状況を示す図である。FIG. 3 is a diagram showing a mounting state of an LED on a substrate surface on which a reflection film (light-shielding film, reflection / light-shielding film) is formed.
【図４】 基板表面への反射／遮光膜を金属膜とした場
合の形成状況を示す図である。FIG. 4 is a diagram showing a state of formation in the case where a metal film is used as a reflection / light-shielding film on the substrate surface.
【図５】 全反射法を採用した指紋入力装置への適用例
を示す図である。FIG. 5 is a diagram showing an example of application to a fingerprint input device employing a total reflection method.
【図６】 従来の指紋入力装置の要部を示す図である。FIG. 6 is a diagram showing a main part of a conventional fingerprint input device.
１（１−１〜１−６）…ＬＥＤ、２…基板、２Ｆ…表
面、２Ｒ…裏面、Ｐ（ＰＡ，ＰＢ，Ｐ１1 ，Ｐ１2 〜Ｐ
６1 ，Ｐ６2 ）…電極パッド、２−１…反射膜、２−
１’…遮光膜、２−１”…反射／遮光膜、３…プリズ
ム、４…受光器、４−１…レンズ、４−２…結像面（Ｃ
ＣＤ）。1 (1-1 to 1-6) LED, 2 substrate, 2F front surface, 2R back surface, P (PA, PB, P11, P12 to P)
61, P62) ... electrode pad, 2-1 ... reflective film, 2-
1 ': light shielding film, 2-1 ": reflection / light shielding film, 3: prism, 4: light receiver, 4-1: lens, 4-2: imaging surface (C
CD).
Claims (3)
れたプリズムと、基板の表面に実装され前記プリズムの
内部を通してその指紋採取面に光を照射する光源とを備
えた指紋入力装置において、 前記光源が実装されている基板の表面に光反射率の高い
膜が形成されていることを特徴とする指紋入力装置。1. A fingerprint input device comprising: a prism arranged on one side thereof as a fingerprint collecting surface; and a light source mounted on a surface of a substrate and radiating light to the fingerprint collecting surface through the inside of the prism. A fingerprint input device, wherein a film having a high light reflectance is formed on a surface of the substrate on which the light source is mounted.
れたプリズムと、基板の表面に実装され前記プリズムの
内部を通してその指紋採取面に光を照射する光源とを備
えた指紋入力装置において、 前記光源が実装されている基板の表面に光を遮光する膜
が形成されていることを特徴とする指紋入力装置。2. A fingerprint input device comprising: a prism arranged on one side thereof as a fingerprint collecting surface; and a light source mounted on a surface of a substrate and irradiating the fingerprint collecting surface with light through the inside of the prism. A fingerprint input device, wherein a film for blocking light is formed on a surface of the substrate on which the light source is mounted.
れたプリズムと、基板の表面に実装され前記プリズムの
内部を通してその指紋採取面に光を照射する光源とを備
えた指紋入力装置において、 前記光源が実装されている基板の表面に光反射率が高く
且つ光を遮光する膜が形成されていることを特徴とする
指紋入力装置。3. A fingerprint input device comprising: a prism arranged on one side thereof as a fingerprint collecting surface; and a light source mounted on a surface of a substrate and illuminating the fingerprint collecting surface with light through the interior of the prism. A fingerprint input device, wherein a film having high light reflectance and blocking light is formed on a surface of a substrate on which the light source is mounted.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9164018A JPH1115949A (en) | 1997-06-20 | 1997-06-20 | Fingerprint input device |
| US08/985,112 US6185319B1 (en) | 1996-12-06 | 1997-12-04 | Fingerprint input apparatus |
| KR1019970066457A KR100295773B1 (en) | 1996-12-06 | 1997-12-05 | Fingerprint input device |
| CN97125449A CN1111821C (en) | 1996-12-06 | 1997-12-05 | Finger print input device |
| EP97121472A EP0847024A3 (en) | 1996-12-06 | 1997-12-05 | Fingerprint input apparatus |
| US09/655,155 US6463166B1 (en) | 1996-12-06 | 2000-09-05 | Fingerprint input apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9164018A JPH1115949A (en) | 1997-06-20 | 1997-06-20 | Fingerprint input device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1115949A true JPH1115949A (en) | 1999-01-22 |
Family
ID=15785232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9164018A Pending JPH1115949A (en) | 1996-12-06 | 1997-06-20 | Fingerprint input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1115949A (en) |
-
1997
- 1997-06-20 JP JP9164018A patent/JPH1115949A/en active Pending
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