JPH0575786A - Close contact type image sensor - Google Patents
Close contact type image sensorInfo
- Publication number
- JPH0575786A JPH0575786A JP26132091A JP26132091A JPH0575786A JP H0575786 A JPH0575786 A JP H0575786A JP 26132091 A JP26132091 A JP 26132091A JP 26132091 A JP26132091 A JP 26132091A JP H0575786 A JPH0575786 A JP H0575786A
- Authority
- JP
- Japan
- Prior art keywords
- receiving element
- light receiving
- image sensor
- transparent electrode
- liquid crystal
- 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
- Facsimile Heads (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、画像を読み取るため
の完全密着型読み取り装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perfect contact type reader for reading an image.
【０００２】[0002]
【従来の技術】従来、小型の画像読み取り装置として、
特公昭５５−４４４７０号公報、特開昭５８−３８０６
０号公報などに示されるような完全密着型イメージセン
サが知られている。図３に従来の完全密着型イメージセ
ンサに構造を示す。図３（ａ）は縦断面形状を、図３
（ｂ）は横からの断面形状を示す。ガラス基板１の上に
クロム（Ｃｒ）着膜層などからなる遮光性の下部電極２
１をイメージセンサ全面にわたって共通電極として設
け、その上に各画素単位でアモルファスシリコン（ａ−
Ｓｉ）などの光電変換層２２、酸化インジウム・錫（Ｉ
ＴＯ）などからなる上部透明電極２３を積層して受光素
子２が形成され、全ての受光素子２の上に透明な樹脂ま
たは接着剤層３’を設け、裏面に透明電極４を設けた保
護ガラス５を透明な層３’の上に重ねてイメージセンサ
としている。このイメージセンサは、各受光素子に対応
して下部電極に設けられた採光窓６から入射した照明光
９が原稿７の表面で原稿面の情報を担って反射され、受
光素子２に入射して、電気信号に換えられ画像情報を読
み取っている。2. Description of the Related Art Conventionally, as a small image reading device,
JP-B-55-44470, JP-A-58-3806
There is known a perfect contact type image sensor as disclosed in Japanese Patent Publication No. 0. FIG. 3 shows the structure of a conventional perfect contact type image sensor. FIG. 3A shows a vertical cross-sectional shape, and FIG.
(B) shows a cross-sectional shape from the side. A light-shielding lower electrode 2 made of a chromium (Cr) coating film layer or the like on a glass substrate 1.
1 is provided as a common electrode over the entire surface of the image sensor, and amorphous silicon (a-
Photoelectric conversion layer 22 such as Si), indium oxide / tin (I
A protective glass having a transparent resin or adhesive layer 3'provided on all the light-receiving elements 2 and a transparent electrode 4 on the back surface. 5 is laminated on the transparent layer 3'to form an image sensor. In this image sensor, the illumination light 9 that has entered from a lighting window 6 provided in the lower electrode corresponding to each light receiving element is reflected on the surface of the original 7 while carrying the information of the original surface, and enters the light receiving element 2. , The image information is read by being converted into an electric signal.
【０００３】しかしながら、入射光は原稿面で散乱反射
し、かつ、原稿と受光素子の間におよそ数１０μｍの距
離が存在するため、このような構成のイメージセンサ
は、一つの画素からの反射光がそれぞれ隣接する受光素
子にも入射するので、画像信号の解像度を低下させる要
因となっていた。However, since the incident light is scattered and reflected on the surface of the original and there is a distance of about several tens of μm between the original and the light receiving element, the image sensor having such a structure has a reflection light from one pixel. Incident on the adjacent light receiving elements, which is a factor of lowering the resolution of the image signal.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、周辺画素か
らの反射光が受光素子に入射することをさえぎることに
よって、完全密着型イメージセンサの解像度を向上させ
ることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to improve the resolution of a perfect contact type image sensor by blocking reflected light from peripheral pixels from entering a light receiving element.
【０００５】[0005]
【課題を解決するための手段】受光素子面上に液晶・高
分子複合体を設け、液晶の軸の方向を受光素子と原稿と
を結ぶ直線上に設定する。[Means for Solving the Problems] A liquid crystal / polymer composite is provided on the surface of a light receiving element, and the direction of the axis of the liquid crystal is set on a straight line connecting the light receiving element and the original.
【０００６】[0006]
【作用】本発明によれば、原稿上の所定の点からの反射
光の光路を、所定の点に対応した特定の受光素子に向け
て設定できるので、各画素と受光素子が１対１に対応
し、周辺画素からの反射光の影響をとりのぞける。According to the present invention, since the optical path of the reflected light from a predetermined point on the original can be set toward a specific light receiving element corresponding to the predetermined point, each pixel and the light receiving element have a one-to-one correspondence. Correspondingly, the influence of the reflected light from the peripheral pixels can be removed.
【０００７】[0007]
【実施例】以下、実施例に基づいて、本発明を具体的に
説明する。本実施例によるイメージセンサの構造上の特
徴は、受光素子と保護用ガラスとの間に液晶・高分子複
合体を設けた点にある。液晶を高分子媒体に分散させた
いわゆる液晶・高分子複合体（ＬＣＰＣ，（Ｌｉｑｕｉ
ｄ Ｃｒｙｓｔａｌ／Ｐｏｌｉｍｅｒ Ｃｏｍｐｏｓｉ
ｔｅ）に電界を加えることによって液晶の軸をそろえ屈
折率に方向性を与えて光の透過に方向性を持たせること
は、例えば、 Ｈ．Ｇ．Ｃｒａｉｇｈｅａｄ ｅｔａｌ，Ａｐｐｌ．Ｐ
ｈｙｓ．Ｌｅｔｔ．，Ｖｏｌ．４０，ｐ２２，１９８６ に示されるように既に知られている。EXAMPLES The present invention will be specifically described below based on examples. The structural feature of the image sensor according to this embodiment is that a liquid crystal / polymer composite is provided between the light receiving element and the protective glass. A so-called liquid crystal / polymer composite (LCPC, (Liqui) in which liquid crystal is dispersed in a polymer medium
d Crystal / Polymer Composi
te), an electric field is applied to align the axes of the liquid crystals to give directionality to the refractive index and give directionality to the transmission of light. G. Craighead et al, Appl. P
hys. Lett. , Vol. 40, p22, 1986 and already known.
【０００８】本実施例によるイメージセンサの構造を図
１によって説明する。図１（ａ）はイメージセンサの平
面図であり、図１（ｂ）は（ａ）におけるＢ−Ｂ’の断
面図であり、図１（ｃ）は（ａ）におけるＣ−Ｃ’の断
面図である。絶縁性基板１の上に導電材料からなる各画
素単位の個別の下部電極２１を設け、この上にアモルフ
ァスシリコンなどからなる光電変換層２２と上部透明電
極２３を積層して受光素子２からなる画素列をつくり、
さらにこの上に前記した液晶・高分子複合体（ＬＣＰ
Ｃ）層３を設け、下面に目的とする画素列に相当する部
分に各画素に共通な透明電極４を設けたガラス板５をＬ
ＣＰＣ層３の上に貼り付け、そして、基板１には、下面
から入射する原稿照射光９が受光素子２に直接入射しな
いようにする遮光手段がほどこされており、この遮光手
段の一部に原稿照射用窓６を設けるとともにこの窓には
各画素に共通の透明電極８を設けてイメージセンサが構
成されている。The structure of the image sensor according to this embodiment will be described with reference to FIG. 1A is a plan view of the image sensor, FIG. 1B is a sectional view taken along the line BB ′ in FIG. 1A, and FIG. 1C is a sectional view taken along the line CC ′ in FIG. It is a figure. A pixel including a light receiving element 2 is provided by providing an individual lower electrode 21 made of a conductive material for each pixel unit on the insulating substrate 1, and stacking a photoelectric conversion layer 22 made of amorphous silicon or the like and an upper transparent electrode 23 on the lower electrode 21. Make a line,
Furthermore, a liquid crystal / polymer composite (LCP
C) A glass plate 5 provided with a layer 3 and a transparent electrode 4 common to each pixel provided on the lower surface in a portion corresponding to a target pixel row
The substrate 1 is provided with a light-shielding means which is attached on the CPC layer 3 and prevents the original irradiation light 9 incident from the lower surface from directly entering the light-receiving element 2. A part of this light-shielding means is provided. An image sensor is configured by providing an original irradiation window 6 and a transparent electrode 8 common to each pixel in this window.
【０００９】このイメージセンサの受光素子２上面の透
明共通電極２３と原稿照射用窓６の透明電極８を同電位
にし、ガラス板５に設けた透明電極４にそれとは逆の電
位の電圧を印加して、透明共通電極２３および透明電極
４との間に電界を発生させると、液晶・高分子複合体３
の結晶の軸の方向が、透明電極８から透明電極４へ向か
う方向および透明電極４から受光素子の上部透明電極２
３へ向かう方向に揃えられる。このことによって光路
は、原稿照射用の窓からガラス板下面の透明電極４を透
過してほとんど散乱されることなく原稿９に向かう経路
と、原稿で反射され、再び透明電極４を透過して受光素
子２へ向かう経路とが形成される。さらに、上述のよう
に電界によって軸をあわせた上で、液晶・高分子複合体
を加熱し、高分子を固化させれば液晶の軸を固定するこ
とができる。The transparent common electrode 23 on the upper surface of the light receiving element 2 of this image sensor and the transparent electrode 8 of the document irradiation window 6 are made to have the same potential, and a voltage having an opposite potential is applied to the transparent electrode 4 provided on the glass plate 5. Then, when an electric field is generated between the transparent common electrode 23 and the transparent electrode 4, the liquid crystal / polymer composite 3
The direction of the crystal axis is from the transparent electrode 8 to the transparent electrode 4 and from the transparent electrode 4 to the upper transparent electrode 2 of the light receiving element.
Aligned in the direction of 3. As a result, the optical path passes from the window for irradiating the original document to the transparent electrode 4 on the lower surface of the glass plate and goes to the original document 9 with almost no scattering. A path to the element 2 is formed. Furthermore, as described above, the axis of the liquid crystal can be fixed by aligning the axis with the electric field and then heating the liquid crystal / polymer composite to solidify the polymer.
【００１０】第２の実施例を図２を用いて説明する。図
２（ａ）はイメージセンサの平面図であり、図２（ｂ）
は（ａ）におけるＢ−Ｂ’の断面図であり、図２（ｃ）
は（ａ）におけるＣ−Ｃ’の断面図である。本実施例の
第１の実施例との相違は、受光素子２下面の金属電極２
１が共通電極であり、受光素子上面の透明電極２３が画
素毎の個別電極となっている点で相違する。基板１の上
に導電材料からなる各画素に共通の下部電極２１を設
け、この上にアモルファスシリコンなどからなる光電変
換層２２と各画素単位の個別の上部透明電極２３を積層
して受光素子２からなる画素列をつくり、さらにこの上
に前記した液晶・高分子複合体（ＬＣＰＣ）層３を設
け、下面に目的とする画素列に相当する部分に各画素に
共通な透明電極４を設けたガラス板５をＬＣＰＣ層３の
上に貼り付け、そして、基板１には、下面から入射する
原稿照射光９が受光素子２に直接入射しないようにする
遮光手段がほどこされており、この遮光手段の一部に原
稿照射用窓６を設けるとともにこの窓には各画素に共通
の透明電極８を設けてイメージセンサが構成されてい
る。A second embodiment will be described with reference to FIG. FIG. 2A is a plan view of the image sensor, and FIG.
FIG. 2C is a sectional view taken along line BB ′ in FIG.
FIG. 7B is a cross-sectional view taken along the line CC ′ of FIG. This embodiment is different from the first embodiment in that the metal electrode 2 on the lower surface of the light receiving element 2 is
The difference is that 1 is a common electrode, and the transparent electrode 23 on the upper surface of the light receiving element is an individual electrode for each pixel. A lower electrode 21 made of a conductive material and common to each pixel is provided on the substrate 1, and a photoelectric conversion layer 22 made of amorphous silicon or the like and an individual upper transparent electrode 23 for each pixel are laminated on the lower electrode 21. And a liquid crystal / polymer composite (LCPC) layer 3 is provided on the pixel row, and a transparent electrode 4 common to each pixel is provided on the lower surface in a portion corresponding to the intended pixel row. The glass plate 5 is attached onto the LCPC layer 3, and the substrate 1 is provided with a light shielding means for preventing the original irradiation light 9 incident from the lower surface from directly entering the light receiving element 2. An image irradiating window 6 is provided in a part of the area, and a transparent electrode 8 common to each pixel is provided in this window to form an image sensor.
【００１１】このイメージセンサの受光素子２上面の個
別の透明電極２３と原稿照射用窓６の透明電極８を同電
位にして、ガラス板５に設けた透明電極４にそれとは逆
の電位の電圧を印加して、透明個別電極２３および透明
電極８と透明電極４との間に電界を発生させると、液晶
・高分子複合体３の結晶の軸の方向が、透明電極８から
透明電極４へ向かう方向および透明電極４から受光素子
の上部透明電極２３へ向かう方向に揃えられる。このこ
とによって光路は、原稿照射用の窓からガラス板下面の
透明電極４を透過してほとんど散乱されることなく原稿
９に向かう経路と、原稿で反射され、再び透明電極４を
透過して受光素子２へ向かう経路とが形成される。さら
に、このように電界によって軸をあわせた上で、液晶・
高分子複合体を加熱し、高分子を固化させれば液晶の軸
を固定することができる。The individual transparent electrode 23 on the upper surface of the light receiving element 2 of this image sensor and the transparent electrode 8 of the document irradiation window 6 are set to the same potential, and the transparent electrode 4 provided on the glass plate 5 is applied with a voltage of the opposite potential. Is applied to generate an electric field between the transparent individual electrode 23 and the transparent electrode 8 and the transparent electrode 4, the direction of the crystal axis of the liquid crystal / polymer composite 3 changes from the transparent electrode 8 to the transparent electrode 4. It is aligned in the direction toward and the direction from the transparent electrode 4 to the upper transparent electrode 23 of the light receiving element. As a result, the optical path passes from the window for irradiating the original document to the transparent electrode 4 on the lower surface of the glass plate and goes to the original document 9 with almost no scattering. A path to the element 2 is formed. Furthermore, after aligning the axes with the electric field in this way, the liquid crystal
The axis of the liquid crystal can be fixed by heating the polymer composite and solidifying the polymer.
【００１２】[0012]
【発明の効果】本発明においては、液晶・高分子複合体
を設け、この液晶の軸の方向を受光素子面と原稿面とを
結ぶ直線上に設定することによって、各画素と受光素子
を１対１に対応させることができ、隣接する受光素子を
光学的に分離することが可能となり、完全密着型イメー
ジセンサの解像度を向上させることができる。According to the present invention, a liquid crystal / polymer composite is provided, and the direction of the axis of the liquid crystal is set on the straight line connecting the light receiving element surface and the document surface, whereby each pixel and the light receiving element are set to one. It is possible to correspond to the pair 1 and it is possible to optically separate the adjacent light receiving elements, and it is possible to improve the resolution of the perfect contact type image sensor.
【図１】 液晶・高分子複合体を設けた完全密着型イメ
ージセンサの概略図。FIG. 1 is a schematic view of a perfect contact type image sensor provided with a liquid crystal / polymer composite.
【図１（ａ）】 本発明の第１の実施例の上面図。FIG. 1A is a top view of the first embodiment of the present invention.
【図１（ｂ）】 図１（ａ）のＢ−Ｂ’断面図。FIG. 1B is a sectional view taken along the line B-B ′ of FIG.
【図１（ｃ）】 図１（ａ）のＣ−Ｃ’断面図。FIG. 1C is a cross-sectional view taken along the line C-C ′ of FIG.
【図２（ａ）】 本発明の第２の実施例の上面図。FIG. 2 (a) is a top view of the second embodiment of the present invention.
【図２（ｂ）】 図２（ａ）のＢ−Ｂ’断面図。2B is a sectional view taken along the line B-B ′ of FIG.
【図２（ｃ）】 図２（ａ）のＣ−Ｃ’断面図。2C is a cross-sectional view taken along the line C-C ′ of FIG.
【図３】 従来例の断面図。FIG. 3 is a sectional view of a conventional example.
１ ガラス基板、 ２ 受光素子、 ２１ 受光素子の
下部電極、 ２２ 光電変換層、 ２３ 受光素子の上
部電極、 ３ 液晶・高分子複合体、 ４ 透明電極、
５ 保護ガラス、 ６ 原稿照射用窓、 ７ 原稿、
８ 透明電極、９ 照射光・反射光1 glass substrate, 2 light receiving element, 21 lower electrode of light receiving element, 22 photoelectric conversion layer, 23 upper electrode of light receiving element, 3 liquid crystal / polymer composite, 4 transparent electrode,
5 Protective glass, 6 Original irradiation window, 7 Original,
8 transparent electrodes, 9 irradiation light / reflected light
Claims (1)
光を受光する受光素子とを設けた完全密着型のイメージ
センサにおいて、 受光素子面上に液晶・高分子複合体（ＬＣＰＣ）を設け
るとともに、 下面に透明電極を設けた保護透明板を受光素子面と原稿
面との間に設けたことを特徴とする完全密着型イメージ
センサ。1. A perfect contact type image sensor in which a window for irradiating an original and a light receiving element for receiving reflected light from the original are provided on a substrate, and a liquid crystal / polymer composite (LCPC) is provided on the surface of the light receiving element. A perfect contact type image sensor characterized in that a protective transparent plate having a transparent electrode on the lower surface is provided between the light receiving element surface and the document surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26132091A JPH0575786A (en) | 1991-09-13 | 1991-09-13 | Close contact type image sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26132091A JPH0575786A (en) | 1991-09-13 | 1991-09-13 | Close contact type image sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0575786A true JPH0575786A (en) | 1993-03-26 |
Family
ID=17360174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26132091A Pending JPH0575786A (en) | 1991-09-13 | 1991-09-13 | Close contact type image sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0575786A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2101251A2 (en) * | 2008-03-14 | 2009-09-16 | Samsung Electronics Co., Ltd. | Liquid crystal display, display system including the liquid crystal display and method of recognizing an object using the liquid crystal display |
-
1991
- 1991-09-13 JP JP26132091A patent/JPH0575786A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2101251A2 (en) * | 2008-03-14 | 2009-09-16 | Samsung Electronics Co., Ltd. | Liquid crystal display, display system including the liquid crystal display and method of recognizing an object using the liquid crystal display |
| EP2101251A3 (en) * | 2008-03-14 | 2011-08-03 | Samsung Electronics Co., Ltd. | Liquid crystal display, display system including the liquid crystal display and method of recognizing an object using the liquid crystal display |
| US8189128B2 (en) | 2008-03-14 | 2012-05-29 | Samsung Electronics Co., Ltd. | Liquid crystal display having first and second diffusion members and a plurality of sensors that can detect a sensing signal reflected from an object |
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