【０００１】[0001]
【発明の属する技術分野】本発明は例えばコピー、ファ
クシミリ、イメージスキャナー等に利用される画像入力
光学系、或いは紙に書かれている文字等を電子手帳やパ
ソコンに入力するための画像入力光学系、更にはこれら
画像入力光学系を組込んだ画像入力装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input optical system used for, for example, copying, facsimile, image scanner, etc., or an image input optical system for inputting characters written on paper into an electronic notebook or a personal computer. Furthermore, the present invention relates to an image input device incorporating these image input optical systems.
【０００２】[0002]
【従来の技術】多数のレンズを集合したレンズアレイ、
ピンホールアレイ或いは光センサを構成要素とする画像
入力光学系として、特開平３−２７６１２０号公報及び
特開平６−３００６３３号公報に開示されるものが知ら
れている。2. Description of the Related Art A lens array in which a large number of lenses are assembled,
As an image input optical system having a pinhole array or an optical sensor as a constituent element, those disclosed in JP-A-3-276120 and JP-A-6-300633 are known.
【０００３】特開平３−２７６１２０号公報に開示され
る光学系は、ロッドレンズアレイ或いは平板型マイクロ
レンズの後方にピンホールアレイを配設し、生体組織を
透過してくる光のうち、ピンホールアレイにて光軸に平
行な平面波のみを取り出すようにしたものである。In the optical system disclosed in Japanese Patent Laid-Open No. 3-276120, a pinhole array is arranged behind a rod lens array or a flat plate type microlens, and pinholes of light transmitted through living tissues are pinholes. In the array, only plane waves parallel to the optical axis are taken out.
【０００４】特開平６−３００６３３号公報に開示され
る光学系は、試料からの光を２次元結像アレイ、ピンホ
ール板、コリメートレンズアレイ、ビームスプリッタ及
び２次元光検出器等を介して、試料の２次元分光画像を
表示するようにしたものである。The optical system disclosed in Japanese Unexamined Patent Publication No. 6-300633 discloses a method in which light from a sample is passed through a two-dimensional imaging array, a pinhole plate, a collimating lens array, a beam splitter, a two-dimensional photodetector, and the like. The two-dimensional spectroscopic image of the sample is displayed.
【０００５】[0005]
【発明が解決しようとする課題】上述した光学系、即
ち、レンズアレイを構成する個々のレンズに、光センサ
アレイを構成する個々の光センサを対応させた光学系
を、文字等を認識する画像入力装置に適用した場合、各
センサへの入力画像が重なり合う不利が生じる。また、
上述した光学系ではレンズを斜めに通った光が他のセン
サに入射（クロストーク）する不利がある。The above-mentioned optical system, that is, the optical system in which the individual optical sensors forming the optical sensor array correspond to the individual lenses forming the lens array, is used to recognize characters and the like. When applied to the input device, there is a disadvantage that the input images to each sensor overlap. Also,
The above-mentioned optical system has a disadvantage that light obliquely passing through the lens is incident (crosstalk) on another sensor.
【０００６】また、特開平３−２７６１２０号公報に開
示される光学系は光軸に平行な平面波のみを取り出すた
めに、ピンホールアレイの開口径を極めて小さくする必
要があり、画像情報を読み取ろうとすると、検出信号が
微弱になって、Ｓ／Ｎが悪くなる。Further, in the optical system disclosed in Japanese Patent Laid-Open No. 3-276120, it is necessary to make the aperture diameter of the pinhole array extremely small in order to extract only plane waves parallel to the optical axis. Then, the detection signal becomes weak and the S / N becomes worse.
【０００７】また、画像入力光学系を組み込んだ従来の
画像入力装置にあっては、画像情報に対して装置本体を
垂直に立てて使用しなければならず、使い勝手が悪い。Further, in the conventional image input apparatus incorporating the image input optical system, the main body of the apparatus must be set upright with respect to the image information and used, which is inconvenient.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
本願は、請求項１乃至請求項４に、コピー、ファクシミ
リ、イメージスキャナー等の密着タイプの画像入力光学
系に適する画像入力光学系を、請求項５乃至請求項８に
文字等を認識するハンディタイプの画像入力装置に適す
る画像入力光学系を、更に請求項９乃至請求項１１にこ
れら画像入力光学系を組み込んだ画像入力装置を規定し
た。In order to solve the above problems, the present application provides an image input optical system suitable for a contact type image input optical system such as a copying machine, a facsimile machine, an image scanner, etc. An image input optical system suitable for a handy type image input device for recognizing characters and the like is defined in claims 5 to 8, and an image input device incorporating these image input optical systems is defined in claims 9 to 11. .
【０００９】即ち、請求項１に記載の画像入力光学系
は、画像情報と一定距離離間して設けられるとともに多
数のレンズを一次元又は二次元状に配列したレンズアレ
イと、このレンズアレイの画像情報と反対側になる後側
に配置されるとともに画像情報を光信号として検出する
多数のセンサを前記レンズに対応して一次元又は二次元
状に配列した光センサアレイとで構成され、更に、前記
画像情報とレンズアレイとの距離をａ、レンズアレイと
光センサアレイとの距離をｂ、レンズの配列ピッチを
ｐ、センサの受光幅をｗとした場合、これらは以下の
（式１）を満足するようにした。 ｂ／ａ≧ｗ／ｐ・・・・・・・・・・・・・・・・・・（式１）That is, the image input optical system according to claim 1 is provided with a lens array in which a large number of lenses are arranged one-dimensionally or two-dimensionally, and is provided with a certain distance from the image information, and an image of this lens array. It is composed of an optical sensor array in which a number of sensors for detecting image information as an optical signal are arranged on the rear side opposite to the information and arranged in a one-dimensional or two-dimensional manner corresponding to the lens. When the distance between the image information and the lens array is a, the distance between the lens array and the optical sensor array is b, the arrangement pitch of the lenses is p, and the light receiving width of the sensor is w, these are expressed by the following (formula 1). I was satisfied. b / a ≧ w / p (Equation 1)
【００１０】上記の構成により、入力画像の重なりを防
止できる。尚、画像情報のうちセンサに入力されない部
分の割合を少なくし、検出信号レベルを大きくするた
め、請求項２に記載したように以下の式（２）を満足す
ることが好ましい。 ｗ／ｐ≧ｂ／（１０ａ）・・・・・・・・・・・・・・（式２）With the above configuration, it is possible to prevent overlapping of input images. In order to reduce the proportion of the image information that is not input to the sensor and increase the detection signal level, it is preferable to satisfy the following expression (2) as described in claim 2. w / p ≧ b / (10a) ... (Equation 2)
【００１１】また請求項３に記載の画像入力光学系は、
画像情報と一定距離離間して設けられるとともに多数の
レンズを一次元又は二次元状に配列したレンズアレイ
と、このレンズアレイの画像情報と反対側になる後側に
配置されるとともに画像情報を光信号として検出する多
数のセンサを前記レンズに対応して一次元又は二次元状
に配列した光センサアレイと、前記レンズアレイと光セ
ンサアレイとの間に設けられるピンホールアレイとで構
成され、更に、前記画像情報とレンズアレイとの距離を
ａ、レンズアレイとピンホールアレイとの距離をｂ1、
ピンホールアレイと光センサアレイとの距離をｂ2、レ
ンズの配列ピッチをｐ、センサの受光幅をｗ1、ピンホ
ールアレイのホール幅をｗ2とした場合、これらは以下
の（式３）及び（式４）を満足するようにした。 ｂ1／ａ≧ｗ2／ｐ・・・・・・・・・・・・・・・・（式３） ｐ−ｗ1／２ｐ≧ｂ2／ｂ1≧ｗ1／２ｐ・・・・・・・（式４）Further, the image input optical system according to claim 3 is
A lens array in which a large number of lenses are arranged in a one-dimensional or two-dimensional manner and is provided at a certain distance from the image information, and is arranged on the rear side opposite to the image information of this lens array and the image information is optically transmitted. A plurality of sensors that detect as signals are arranged in a one-dimensional or two-dimensional array corresponding to the lens, and a pinhole array provided between the lens array and the optical sensor array. , The distance between the image information and the lens array is a, the distance between the lens array and the pinhole array is b1 ,
When the distance between the pinhole array and the optical sensor array is b2 , the array pitch of the lenses is p, the light receiving width of the sensor is w1 , and the hole width of the pinhole array is w2 , these are given by the following (formula 3). And (formula 4) are satisfied. b1 / a ≧ w2 / p (Equation 3) p-w1 / 2p ≥b2 / b1 ≥w1 / 2p ..... (Formula 4)
【００１２】上記の構成により、ピンホールアレイを構
成要素とした場合の入力画像の重なりを防止できる。ま
たピンホールとセンサの間隔を（式４）を満足するよう
に設定することで、ピンホールを斜めに通った光が、他
のセンサに入射しないようにすることができ、密着セン
サ光学系に有効となる。With the above structure, it is possible to prevent overlapping of input images when the pinhole array is used as a constituent element. Further, by setting the distance between the pinhole and the sensor so as to satisfy (Equation 4), it is possible to prevent the light obliquely passing through the pinhole from entering the other sensors, and the contact sensor optical system can be provided. It becomes effective.
【００１３】尚、画像情報のうちセンサに入力されない
部分の割合を少なくし、検出信号レベルを大きくするた
め、請求項４に記載したように以下の式（５）を満足す
ることが好ましい。 ｗ2／ｐ≧ｂ1／（１０ａ）・・・・・・・・・・・・・（式５）In order to reduce the proportion of the image information that is not input to the sensor and increase the detection signal level, it is preferable to satisfy the following expression (5) as described in claim 4. w2 / p ≧ b1 / (10a) ... (Equation 5)
【００１４】また請求項５に記載の画像入力光学系は、
画像情報と一定距離離間して設けられるとともに多数の
レンズを一次元又は二次元状に配列したレンズアレイ
と、このレンズアレイの画像情報と反対側になる後側に
配置されるとともに画像情報を光信号として検出する多
数のセンサを前記レンズに対応して一次元又は二次元状
に配列した光センサアレイとで構成され、更に、前記画
像情報の有効幅をｗ3、画像情報とレンズアレイとの距
離をａ、レンズアレイと光センサアレイとの距離をｂ、
レンズの配列ピッチをｐ、センサの受光幅をｗとした場
合、これらは以下の（式１）、（式６）を満足するよう
にした。 ｂ／ａ≧ｗ／ｐ・・・・・・・・・・・・・・・・・・（式１） ｐ−（ｗ／２）≧（ｗ3−ｐ）ｂ／ａ・・・・・・・・（式６）The image input optical system according to claim 5 is
A lens array in which a large number of lenses are arranged in a one-dimensional or two-dimensional manner and is provided at a certain distance from the image information, and is arranged on the rear side opposite to the image information of this lens array and the image information is optically transmitted. constructed a number of sensors for detecting a signal in a photosensor array arranged in one-dimensional or two-dimensional shape corresponding to the lens, further, the effective width of the image information w3, image information and the lens array The distance is a, the distance between the lens array and the optical sensor array is b,
When the array pitch of the lenses is p and the light receiving width of the sensor is w, these satisfy the following (Equation 1) and (Equation 6). b / a ≧ w / p (Equation 1) p− (w / 2) ≧ (w3 −p) b / a ... (Equation 6)
【００１５】上記の構成により、入力画像の重なり防止
の他に、画像情報の有効幅を（式６）を満足するように
狭くすることで、斜め光線の最大傾斜角度を制限し、そ
の光線が隣のセンサに入射しないようにすることができ
る。With the above structure, in addition to preventing the overlapping of the input images, the effective width of the image information is narrowed so as to satisfy (Equation 6), thereby limiting the maximum inclination angle of the oblique rays and the rays. It is possible to prevent the incident on the adjacent sensor.
【００１６】尚、画像情報のうちセンサに入力されない
部分の割合を少なくし、検出信号レベルを大きくするた
め、請求項６に記載したように以下の式（２）を満足す
ることが好ましい。 ｗ／ｐ≧ｂ／（１０ａ）・・・・・・・・・・・・・・（式２）In order to reduce the proportion of the image information that is not input to the sensor and increase the detection signal level, it is preferable to satisfy the following expression (2) as described in claim 6. w / p ≧ b / (10a) ... (Equation 2)
【００１７】また請求項７に記載の画像入力光学系は、
画像情報と一定距離離間して設けられるとともに多数の
レンズを一次元又は二次元状に配列したレンズアレイ
と、このレンズアレイの画像情報と反対側になる後側に
配置されるとともに画像情報を光信号として検出する多
数のセンサを前記レンズに対応して一次元又は二次元状
に配列した光センサアレイと、前記レンズアレイと光セ
ンサアレイとの間に設けられるピンホールアレイとで構
成され、更に、前記画像情報の有効幅をｗ3、画像情報
とレンズアレイとの距離をａ、レンズアレイとピンホー
ルアレイとの距離をｂ1、ピンホールアレイと光センサ
アレイとの距離をｂ2、レンズの配列ピッチをｐ、セン
サの受光幅をｗ1、ピンホールアレイのホール幅をｗ2と
した場合、これらは以下の（式３）、（式４）及び（式
７）を満足するようにした。 ｂ1／ａ≧ｗ2／ｐ・・・・・・・・・・・・・・・・（式３） ｐ−ｗ1／２ｐ≧ｂ2／ｂ1≧ｗ1／２ｐ・・・・・・・（式４） ｐ−（ｗ2／２）≧（ｗ3−ｐ）ｂ1／ａ・・・・・・・（式７）The image input optical system according to claim 7 is
A lens array in which a large number of lenses are arranged in a one-dimensional or two-dimensional manner and is provided at a certain distance from the image information, and is arranged on the rear side opposite to the image information of this lens array and the image information is optically transmitted. A plurality of sensors that detect as signals are arranged in a one-dimensional or two-dimensional array corresponding to the lens, and a pinhole array provided between the lens array and the optical sensor array. , The effective width of the image information is w3 , the distance between the image information and the lens array is a, the distance between the lens array and the pinhole array is b1 , the distance between the pinhole array and the optical sensor array is b2 , the lens w1 the light receiving width of the arrangement pitch p, of the sensor, if the hole width of the pinhole array and the w2, these are the following (equation 3), satisfies the equation (4) and (formula 7) It was. b1 / a ≧ w2 / p (Equation 3) p-w1 / 2p ≥b2 / b1 ≥w1 / 2p ......... (Equation4) p- (w 2/2 ) ≧ (w 3 -p) b 1 / a ······· ( Equation 7)
【００１８】請求項７は前記（式４）と（式７）（請求
項５の式６）とを同時に満足するようにしたものであ
る。上記したように、（式４）と（式７）は何れも、レ
ンズを斜めに通った光が他のセンサに入射（クロストー
ク）しないための条件であり、（式７）だけで、基本的
にはクロストークなしとなり、（式４）の条件は理論的
にはなくともよいことになる。ただし、（式７）の条件
を満たしていても実際にはレンズの回析や収差で、ある
程度クロストークが発生する。これを更に低減するため
に（式４）が有効になる。A seventh aspect of the present invention satisfies the above-mentioned (formula 4) and (formula 7) (formula 6 of claim 5) at the same time. As described above, both (Equation 4) and (Equation 7) are conditions for preventing the light obliquely passing through the lens from entering (crosstalking) the other sensor. Since there is no crosstalk, the condition of (Equation 4) does not have to be theoretically necessary. However, even if the condition of (Equation 7) is satisfied, crosstalk occurs to some extent due to diffraction and aberration of the lens. (Equation 4) is effective to further reduce this.
【００１９】尚、画像情報のうちセンサに入力されない
部分の割合を少なくし、検出信号レベルを大きくするた
め、請求項８に記載したように以下の式（５）を満足す
ることが好ましい。 ｗ2／ｐ≧ｂ1／（１０ａ）・・・・・・・・・・・・・（式５）In order to reduce the proportion of the image information that is not input to the sensor and increase the detection signal level, it is preferable to satisfy the following expression (5) as described in claim 8. w2 / p ≧ b1 / (10a) ... (Equation 5)
【００２０】また、本発明に係る画像入力装置は、密着
センサの他に他の有効な形態として傾斜した状態の画像
入力装置（請求項９〜１１）も考えられ、この場合、画
像情報と画像入力光学系のレンズとの距離を一定にする
ケース内に画像入力光学系が収められ、更にケースの先
端面を画像情報に傾斜した状態で摺接すべく光軸に対し
て角度をもって形成した。ここで、前記画像入力光学系
としては、前記請求項１乃至請求項８に記載した画像入
力光学系を適用する。In addition to the contact sensor, the image input device according to the present invention may be an image input device in a tilted state (claims 9 to 11) as another effective form. In this case, the image information and the image are displayed. The image input optical system is housed in a case that keeps the distance from the lens of the input optical system constant, and is further formed at an angle to the optical axis so that the front end surface of the case is slidably contacted with the image information in a slanted state. Here, the image input optical system according to any one of claims 1 to 8 is applied as the image input optical system.
【００２１】また、前記ケースの先端面のうち、読み取
り部分をその周辺よりも凹んだ構造にすることで、画像
情報を傷つけることなく、またケースの一部を透明また
は窓部にすることで、画像情報を確認しながら画像入力
装置を走査することが可能となる。尚、画像入力装置は
レンズアレイ及びセンサアレイが二次元マトリックス状
に配列されているものを含む。Further, by making the reading portion of the front end surface of the case recessed from the periphery thereof, the image information is not damaged and a part of the case is made transparent or a window. It is possible to scan the image input device while checking the image information. The image input device includes a lens array and a sensor array arranged in a two-dimensional matrix.
【００２２】[0022]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。ここで、図１は本願の画像入
力光学系（ピンホールアレイを構成要素としない）を示
す図であり、図中１は画像情報であり、例えば新聞や本
等に書かれた文字や図形を含む。Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a diagram showing an image input optical system of the present application (a pinhole array is not a constituent element). In FIG. 1, 1 is image information, for example, characters and figures written in newspapers and books. Including.
【００２３】画像情報１の後側（図１において下方）に
はレンズアレイ２を配置しており、このレンズアレイ２
と画像情報１との距離ａが一定となるようにしている。
このレンズアレイ２は多数のレンズ２１を一次元又は二
次元状に配列して構成され、例えば平板型マイクロレン
ズアレイを用いる。A lens array 2 is arranged on the rear side of image information 1 (downward in FIG. 1).
The distance a between the image information 1 and the image information 1 is set to be constant.
The lens array 2 is configured by arranging a large number of lenses 21 in a one-dimensional or two-dimensional manner, and for example, a flat plate type microlens array is used.
【００２４】更に、レンズアレイ２の後側には光センサ
アレイ３を配置している。この光センサアレイ３とレン
ズアレイ２との距離ｂは、光センサアレイ３上に画像情
報１を縮小結像するようにレンズアレイ２の焦点距離に
等しいか若干大きくしている。また、光センサアレイ３
は多数の光センサ３１を備え、これら光センサ３１は前
記レンズ２１に対応して一次元又は二次元状に配列して
いる。Further, an optical sensor array 3 is arranged on the rear side of the lens array 2. The distance b between the photosensor array 3 and the lens array 2 is equal to or slightly larger than the focal length of the lens array 2 so that the image information 1 is reduced and image-formed on the photosensor array 3. Also, the optical sensor array 3
Is provided with a large number of optical sensors 31, and these optical sensors 31 are arranged in a one-dimensional or two-dimensional manner corresponding to the lens 21.
【００２５】ここで、画像入力装置に用いる光学系とし
ては、個々のセンサ３１への入力画像が互いに重なり合
わないようにすることが必要である。この為の条件とし
ては、画像情報１とレンズアレイ２との距離をａ、レン
ズアレイ２と光センサアレイ３との距離をｂ、レンズ２
１の配列ピッチをｐ、センサ３１の受光幅をｗとした場
合、これらが以下の（式１）を満足するようにすればよ
い。 ｂ／ａ≧ｗ／ｐ・・・・・・・・・・・・・・・・・・（式１） 尚、（式１）は入力画像が互いに重なり合わない為の条
件であって、斜め光を他のセンサに入力させない条件で
はない。このための条件は後述する（式４）及び（式
６）である。Here, it is necessary for the optical system used in the image input device to prevent the input images to the individual sensors 31 from overlapping each other. The conditions for this are as follows: the distance between the image information 1 and the lens array 2 is a, the distance between the lens array 2 and the optical sensor array 3 is b, the lens 2
When the arrangement pitch of 1 is p and the light receiving width of the sensor 31 is w, these may satisfy the following (formula 1). b / a ≧ w / p (Equation 1) Note that (Equation 1) is a condition for preventing the input images from overlapping each other. It is not a condition that the oblique light is not input to other sensors. The conditions for this are (Expression 4) and (Expression 6) described later.
【００２６】図２を参照して、（式１）の導入を説明す
る。図２において、画像情報１をａより遠ざけると、個
々のセンサへの入力画像が重なり合い、画像情報１をａ
より近づけると、画像の一部がセンサに入力しなくな
る。そこで、個々のセンサへの入力画像の過不足がない
状態、即ち、レンズアレイ２と画像情報１との距離がａ
の場合に着目すると、△Ｏ1Ｏ2Ｏ3と△Ｏ1Ｏ4Ｏ5は相似
形であるから、ｂ／ａ＝ｗ／ｐとなる。そして、入力画
像の重なりは好ましくないが、入力画像のある程度の不
足は画像読み取りに支障を来さないので、ｂ／ａ≧ｗ／
ｐ（式１）が導き出される。（式１）については、ａを
可変とし、ｂ，ｗについては固定して導き出したが、ｂ
またはｗを可変とし、他の要素を固定しても導き出すこ
とができる。The introduction of (Equation 1) will be described with reference to FIG. In FIG. 2, when the image information 1 is moved away from a, the input images to the individual sensors overlap each other, and the image information 1 becomes a
When brought closer, part of the image does not enter the sensor. Therefore, there is no excess or deficiency of the input image to each sensor, that is, the distance between the lens array 2 and the image information 1 is a.
Focusing on this case, since ΔO1 O2 O3 and ΔO1 O4 O5 are similar figures, b / a = w / p. Although overlapping of input images is not preferable, a certain lack of input images does not hinder image reading, so b / a ≧ w /
p (equation 1) is derived. For (Equation 1), a was made variable and b and w were fixed and derived,
Alternatively, it can be derived by making w variable and fixing other elements.
【００２７】尚、個々のセンサへの入力画像の不足があ
まり大きくなると、画像の読み取りに支障を来すので、
ｗ／ｐ≧ｂ／（１０ａ）とすることが好ましい。If the input images to the individual sensors are too short, the image reading will be hindered.
It is preferable that w / p ≧ b / (10a).
【００２８】ところで、コピー、ファクシミリ、イメー
ジスキャナー等の密着タイプの画像入力装置に対しては
前記した条件（式１）及び（式２）で充分であるが、密
着タイプでない場合、例えば入力ペンのような画像の大
きさを小さい領域に限定可能な場合には、レンズを斜め
に通った光が他のセンサに入射しないようにすることが
好ましい。その為には以下の（式６）を満足するように
すればよい。 ｐ−（ｗ／２）≧（ｗ3−ｐ）ｂ／ａ・・・・・・・・（式６）By the way, the conditions (Equation 1) and (Equation 2) described above are sufficient for a contact type image input device such as a copy machine, a facsimile machine or an image scanner. When it is possible to limit the size of the image to a small area, it is preferable that the light obliquely passing through the lens does not enter another sensor. For that purpose, the following (formula 6) may be satisfied. p- (w / 2) ≧ (w3 −p) b / a ... (Equation 6)
【００２９】図３を参照して、（式６）の導入を説明す
る。レンズを斜めに通った光が他のセンサに入射しない
ようにするには図３において、右端の画像からの光線が
左端のセンサの右端で結像しないようにすればよい。と
ころで、左端のセンサの右端から当該センサの右隣のセ
ンサの中心部間での距離はｐ−（ｗ／２）である。一
方、右端の画像からの光線が左端のセンサの右端で結像
している状態において、△Ｏ1Ｏ2Ｏ3と△Ｏ1Ｏ4Ｏ5は相
似形であるから、ｐ−（ｗ／２）＝（ｗ3−ｐ）ｂ／ａ
である。そして、図３においては結像する位置が左端の
センサの右端よりも右側であればよいのであるから、ｐ
−（ｗ／２）≧（ｗ3−ｐ）ｂ／ａ（式６）が導き出さ
れる。The introduction of (Equation 6) will be described with reference to FIG. In order to prevent the light obliquely passing through the lens from entering the other sensor, in FIG. 3, light rays from the image at the right end may not be imaged at the right end of the left end sensor. By the way, the distance from the right end of the sensor on the left end to the center of the sensor on the right of the sensor is p- (w / 2). On the other hand, in the state where the light beam from the image at the right end is imaged at the right end of the sensor at the left end, ΔO1 O2 O3 and ΔO1 O4 O5 are similar shapes, so p− (w / 2) = (w3 −p) b / a
It is. Then, in FIG. 3, it suffices that the image forming position is on the right side of the right end of the sensor at the left end, so p
− (W / 2) ≧ (w3 −p) b / a (Equation 6) is derived.
【００３０】図４はピンホールアレイを構成要素とした
本願の画像入力光学系を示す図であり、この画像入力光
学系にあっては、レンズアレイ２と光センサアレイ３と
の間にピンホールアレイ４を配置している。FIG. 4 is a diagram showing an image input optical system of the present application having a pinhole array as a constituent element. In this image input optical system, a pinhole is provided between the lens array 2 and the optical sensor array 3. The array 4 is arranged.
【００３１】ピンホールアレイ４はレンズ２１及びセン
サ３１に対応してピンホール４１が形成され、この構成
において、個々のセンサ３１への入力画像が互いに重な
り合わないようにする為の条件は、画像情報１とレンズ
アレイ２との距離をａ、レンズアレイ２とピンホールア
レイ４との距離をｂ1、ピンホールアレイ４と光センサ
アレイ３との距離をｂ2、レンズ２１の配列ピッチを
ｐ、センサ３１の受光幅をｗ1、ピンホールアレイのホ
ール幅をｗ2とした場合、これらが以下の（式３）及び
（式４）を満足するようにすればよい。 ｂ1／ａ≧ｗ2／ｐ・・・・・・・・・・・・・・・・（式３） ｐ−ｗ1／２ｐ≧ｂ2／ｂ1≧ｗ1／２ｐ・・・・・・・（式４）In the pinhole array 4, a pinhole 41 is formed corresponding to the lens 21 and the sensor 31, and in this structure, the conditions for preventing the input images to the individual sensors 31 from overlapping each other are: The distance between the information 1 and the lens array 2 is a, the distance between the lens array 2 and the pinhole array 4 is b1 , the distance between the pinhole array 4 and the optical sensor array 3 is b2 , and the arrangement pitch of the lenses 21 is p. , W1 is the light receiving width of the sensor 31 and w2 is the hole width of the pinhole array, these may satisfy the following (formula 3) and (formula 4). b1 / a ≧ w2 / p (Equation 3) p-w1 / 2p ≥b2 / b1 ≥w1 / 2p ..... (Formula 4)
【００３２】ピンホールアレイ４を用いた場合には、ピ
ンホールの箇所にセンサ３１があるのと同じことである
から、（式３）については、図２に示した実施例におい
てのレンズアレイ２と光センサアレイ３との距離（ｂ）
を、図５に示すようにレンズアレイ２とピンホールアレ
イ４との距離（ｂ1）に、センサの受光幅（ｗ）をピン
ホールアレイのホール幅（ｗ2）に置き換えることがで
き、したがって、ｂ1／ａ≧ｗ2／ｐ（式３）が導き出さ
れる。When the pinhole array 4 is used, this is the same as the presence of the sensor 31 at the location of the pinhole. Therefore, regarding (Equation 3), the lens array 2 in the embodiment shown in FIG. (B) between the photosensor array 3 and
Can be replaced by the distance (b1 ) between the lens array 2 and the pinhole array 4 as shown in FIG. 5, and the light receiving width (w) of the sensor can be replaced by the hole width (w2 ) of the pinhole array, and , B1 / a ≧ w2 / p (formula 3) is derived.
【００３３】また、尚、個々のセンサへの入力画像の不
足があまり大きくなると、画像の読み取りに支障を来す
ので、ｗ2／ｐ≧ｂ1／（１０ａ）（式５）とすることが
好ましいのは前記した実施例と同じである。If the input images to the individual sensors become too short, the reading of the images will be hindered. Therefore, w2 / p ≧ b1 / (10a) (Equation 5) can be set. Preferred is the same as the above-mentioned embodiment.
【００３４】更に、ピンホールアレイ４を用いた場合に
は、図６及び図６の要部拡大図である図７に示すよう
に、ピンホールアレイ４と光センサアレイ３との距離
（ｂ2）が所定の範囲でないと、レンズ２１ａの隣のレ
ンズ２１ｂの中心を通った光線が、レンズ２１ａに対応
するピンホール４１ａを通り、更にこの光線がセンサ３
１ａまたはセンサ３１ｂの端部にかかることになる。セ
ンサ３１ａに光線がかかる場合には、△Ｏ1Ｏ2Ｏ3と△
Ｏ1Ｏ4Ｏ5は相似形であるから、ｂ2／ｂ1＝ｗ1／２ｐと
なる。そして、これよりもｂ2が大きいことが条件とな
るので、ｂ2／ｂ1≧ｗ1／２ｐが成立する。一方、セン
サ３１ｂに光線がかかる場合には、△Ｏ1Ｏ2Ｏ3と△Ｏ1
Ｏ6Ｏ7は相似形であるから、ｐ−ｗ1／２ｐ＝ｂ2／ｂ1
となる。そして、これよりもｂ2が大きいことが条件と
なるので、ｐ−ｗ1／２ｐ≧ｂ2／ｂ1が成立する。した
がって、ｐ−ｗ1／２ｐ≧ｂ2／ｂ1≧ｗ1／２ｐ（式４）
が導入される。Further, when the pinhole array 4 is used, as shown in FIG. 6 and FIG. 7 which is an enlarged view of the main part of FIG. 6, the distance (b2 ) Is not within a predetermined range, a light ray that has passed through the center of the lens 21b adjacent to the lens 21a passes through the pinhole 41a corresponding to the lens 21a, and this light ray is further detected by the sensor 3
1a or the end of the sensor 31b. If the sensor 31a is exposed to a light beam, ΔO1 O2 O3 and Δ
Since O1 O4 O5 has a similar shape, b2 / b1 = w1 / 2p. Then, the condition is that b2 is larger than this, so that b2 / b1 ≧ w1 / 2p holds. On the other hand, when the sensor 31b is exposed to light, ΔO1 O2 O3 and ΔO1
Since O6 O7 has a similar shape, p−w1 / 2p = b2 / b1
Becomes Then, the condition is that b2 is larger than this, so that p−w1 / 2p ≧ b2 / b1 is established. Therefore, p−w1 / 2p ≧ b2 / b1 ≧ w1 / 2p (Equation 4)
Is introduced.
【００３５】また、ピンホールアレイ４を用いた場合
で、特に密着タイプでないものについては、レンズを斜
めに通った光が他のセンサに入射しないようにすべきで
あり、この為には以下の（式７）を満足するようにすれ
ばよい。 ｐ−（ｗ2／２）≧（ｗ3−ｐ）ｂ1／ａ・・・・・・・（式７）Further, when the pinhole array 4 is used and the non-contact type is not particularly used, light obliquely passing through the lens should be prevented from entering other sensors. It suffices to satisfy (Equation 7).p- (w 2/2) ≧ (w 3 -p) b 1 / a ······· ( Equation 7)
【００３６】図８を参照して、（式７）の導入を説明す
る。レンズを斜めに通った光が他のセンサに入射しない
ようにするには、前記実施例の考え方を適用すれば、図
８において、右端の画像から出て、レンズ２１の中心を
通る光線が当該レンズの隣のレンズ２１に対応するピン
ホール４１に入らないようにすればよい。今、当該対応
するセンサの左端に右端の画像から出た光線が入射する
状態を想定すると、図８において、△Ｏ1Ｏ2Ｏ3と△Ｏ1
Ｏ4Ｏ5が相似形になっている。この状態ではｐ−（ｗ2
／２）＝（ｗ3−ｐ）ｂ1／ａであり、この状態よりもｂ
1が小さいかａが大きければよいのであるから、ｐ−
（ｗ2／２）≧（ｗ3−ｐ）ｂ1／ａが成立する。The introduction of (Equation 7) will be described with reference to FIG. In order to prevent the light that obliquely passes through the lens from entering the other sensors, applying the concept of the above-described embodiment, in FIG. 8, the light ray that exits from the image at the right end and passes through the center of the lens 21 is concerned. It may be arranged so that it does not enter the pinhole 41 corresponding to the lens 21 next to the lens. Assuming now that the light beam emitted from the image on the right end is incident on the left end of the corresponding sensor, in FIG. 8, ΔO1 O2 O3 and ΔO1
O4 O5 has a similar shape. In this state, p- (w2
/ 2) = (w3 −p) b1 / a, and b is better than this state.
Since it suffices if1 is small or a is large, p−
(W 2/2) ≧ ( w 3 -p) b 1 / a is satisfied.
【００３７】次に、本発明に係る画像入力光学系を適用
した画像入力装置の一例を図９乃至図１３に基づいて説
明する。ここで、図９は本願の画像入力光学系を組み込
んだ密着型画像入力装置の断面図、図１０は同画像入力
装置の分解斜視図、図１１はペン型画像入力装置の全体
図、図１２は図１１のＡ方向から見た拡大図、図１３
（ａ）及び（ｂ）は単レンズを組み込んだ場合と本願の
マイクロレンズアレイを組み込んだ場合の読み取り画像
の違いを示す図である。Next, an example of an image input device to which the image input optical system according to the present invention is applied will be described with reference to FIGS. 9 to 13. Here, FIG. 9 is a cross-sectional view of a contact image input device incorporating the image input optical system of the present application, FIG. 10 is an exploded perspective view of the image input device, FIG. 11 is an overall view of the pen image input device, and FIG. 13 is an enlarged view seen from the direction A in FIG.
(A) And (b) is a figure which shows the difference of the read image when a single lens is incorporated and when the microlens array of this application is incorporated.
【００３８】図１乃至図８で説明した部材と同一の部材
については同一の符号を付し、詳細な説明を省略して画
像入力光学系を説明すると、画像入力光学系はカバーガ
ラスＧ１、スペーサＳ１、レンズアレイ２、ガラスＧ
２、スペーサＳ２及び光センサアレイ３を積層して構成
されている。尚、ピンホールアレイをガラスＧ２の表面
に設ける構成としてもよい。The same members as those described with reference to FIGS. 1 to 8 are designated by the same reference numerals, and a detailed description thereof will be omitted. The image input optical system will be described. The image input optical system includes a cover glass G1 and a spacer. S1, lens array 2, glass G
2, the spacer S2 and the optical sensor array 3 are laminated. The pinhole array may be provided on the surface of the glass G2.
【００３９】また、図１１及び図１２に示すペン型画像
入力装置は、円筒状本体６の一端にタッチパネル入力用
の突部７を設け、他端に角筒状のケース８を取り付け、
このケース８内に画像入力光学系を組み込むことで、レ
ンズアレイ２と画像情報との距離（ａ）が一定になるよ
うにしている。In the pen-type image input device shown in FIGS. 11 and 12, a projection 7 for inputting a touch panel is provided at one end of the cylindrical body 6, and a rectangular tube-shaped case 8 is attached at the other end.
By incorporating an image input optical system in the case 8, the distance (a) between the lens array 2 and the image information is made constant.
【００４０】更に、ケース８の画像情報と摺接する先端
面８１は画像情報に傾斜した状態で摺接すべく光軸に対
して角度をもって形成し、且つケース８の一部を透明窓
８ａとすることで上から見えるようにして、読み取るべ
き文書をペンで走査しようとする人が、斜めにしたペン
の透明窓８ａから自分の目で読み取る部分を確認しなが
ら、ペンを走査できるようにした。Further, the front end surface 81 of the case 8 which is in sliding contact with the image information is formed at an angle with respect to the optical axis so as to slidably contact the image information, and a part of the case 8 is used as a transparent window 8a. This allows a person who wants to scan the document to be read with the pen so that the user can scan the pen while checking the portion to be read with his / her own eye through the transparent window 8a of the slanted pen.
【００４１】また、ケース先端面８１のうち、読み取り
部分の中央部に周辺よりも凹んだ凹部８２を形成し、画
像情報を傷つけることなく、また画像情報を確認しなが
ら画像入力装置を走査できるようにしている。Further, a concave portion 82 which is recessed from the periphery is formed in the central portion of the reading portion of the front end surface 81 of the case so that the image input device can be scanned without damaging the image information and while confirming the image information. I have to.
【００４２】更に本発明にあっては、単レンズではなく
多数のレンズが二次元マトリックス状に配列されたレン
ズアレイ２を組み込んでいる。単レンズを用いた場合に
は、例えば「田」という字を傾斜した状態で読み取ると
図１３（ａ）に示すように一端側が狭まり他端側が広が
った形状に読み取ってしまうが、レンズアレイ２を用い
ると、各レンズ２１の光軸がすべて平行であるため、画
像入力装置を斜めにしても、図１３（ｂ）に示すような
正しい形状に読み取ることができる。尚、この場合で
も、隣接画素の画像が重なり合わないために前記（式
１）の条件を満足する必要がある。Further, in the present invention, a lens array 2 in which a large number of lenses are arranged in a two-dimensional matrix form is incorporated instead of a single lens. In the case of using a single lens, for example, when the character “T” is read in a tilted state, one end side is narrowed and the other end side is widened as shown in FIG. When used, since the optical axes of the lenses 21 are all parallel to each other, even if the image input device is tilted, the image can be read in a correct shape as shown in FIG. 13B. Even in this case, it is necessary to satisfy the condition of the above (formula 1) because the images of the adjacent pixels do not overlap each other.
【００４３】また、ペンの先端部を斜めのまま少し丸味
をもたせることで、ペンの傾きを各人が好みに合せて調
節でき使い勝手がよくなる。この場合にも、レンズアレ
イ２を用いた本構成であれば、「田」が歪むことなく、
正しい文字読み取りが可能である。Also, by making the tip of the pen slightly rounded while keeping the tip of the pen slanted, each person can adjust the inclination of the pen to his or her preference, which improves usability. Also in this case, with this configuration using the lens array 2, the "field" is not distorted,
Correct character reading is possible.
【００４４】[0044]
【発明の効果】以上に説明したように本発明によれば、
画像情報と一定距離離間して設けられるとともに多数の
レンズを一次元又は二次元状に配列したレンズアレイ
と、このレンズアレイの画像情報と反対側になる後側に
配置されるとともに画像情報を光信号として検出する多
数のセンサを前記レンズに対応して一次元又は二次元状
に配列した光センサアレイとからなる画像入力光学系、
若しくはこれにレンズアレイと光センサアレイとの間に
設けられるピンホールアレイを加えた画像入力光学系に
おいて、画像情報とレンズアレイとの距離、レンズアレ
イと光センサアレイとの距離、レンズの配列ピッチ、セ
ンサの受光幅に関し、これらが一定の関係を有するよう
にしたので、個々のセンサへの入力画像が互いに重なり
合わないようにすることができる。According to the present invention as described above,
A lens array in which a large number of lenses are arranged in a one-dimensional or two-dimensional manner and is provided at a certain distance from the image information, and is arranged on the rear side opposite to the image information of this lens array and the image information is optically transmitted. An image input optical system including an optical sensor array in which a large number of sensors for detecting as signals are arranged in a one-dimensional or two-dimensional manner corresponding to the lens,
Alternatively, in an image input optical system in which a pinhole array provided between the lens array and the optical sensor array is added, the distance between the image information and the lens array, the distance between the lens array and the optical sensor array, and the arrangement pitch of the lenses Since the light receiving widths of the sensors have a constant relationship, it is possible to prevent the input images to the individual sensors from overlapping each other.
【００４５】また上記において、画像情報の有効幅と他
の寸法、例えば画像情報とレンズアレイとの距離等との
関係を一定にすることで、レンズを斜めに通った光が隣
のセンサに入射（クロストーク）しないようにすること
ができる。このように、入力画像の重なりとクロストー
クを防止することで、コントラストの高い低ノイズの画
像を検出することが可能となる。Further, in the above, by keeping the relationship between the effective width of the image information and other dimensions, for example, the distance between the image information and the lens array, the light obliquely passing through the lens is incident on the adjacent sensor. You can prevent it from (crosstalk). By thus preventing the overlap and crosstalk of the input images, it is possible to detect an image with high contrast and low noise.
【００４６】また本発明に係る画像入力光学系、あるい
はそれ以外の画像入力光学系を用いた画像入力装置にあ
っては、極めて偏平なレンズアレイを用いているので、
画像入力装置全体の薄型化が可能になり、コピー、ファ
クシミリ、イメージセンサ等に組み込み易い。Further, in the image input apparatus using the image input optical system according to the present invention or the image input optical system other than that, since an extremely flat lens array is used,
The image input device as a whole can be made thin, and can be easily incorporated in a copy machine, a facsimile machine, an image sensor, or the like.
【００４７】更に、画像入力装置として例えばペン型と
し、前記画像入力光学系を画像情報と画像入力光学系の
レンズとの距離を一定にするケースに収め、このケース
の先端を画像情報に傾斜した状態で摺接すべく光軸に対
して角度をもって形成したので、自然な姿勢のまま画像
入力操作ができ使用しやすく、また、ケース先端の読み
取り部に凹部を形成することで、画像情報を傷つけるこ
となく、更にケースの一部を透明とすることで、読み取
り走査が楽になり、且つ単レンズではなく、マイクロレ
ンズアレイを用いることで、読み取り画像に歪がなくな
る。Further, the image input device is, for example, a pen type, and the image input optical system is housed in a case where the distance between the image information and the lens of the image input optical system is constant, and the tip of this case is inclined to the image information. Since it is formed at an angle with respect to the optical axis so that it can be slidably contacted in a state, the image input operation can be performed in a natural posture and it is easy to use, and the concave portion is formed in the reading part at the tip of the case to damage the image information. In addition, by making a part of the case transparent, reading scanning becomes easier, and by using a microlens array instead of a single lens, there is no distortion in the read image.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本願の画像入力光学系を示す図FIG. 1 is a diagram showing an image input optical system of the present application.
【図２】（式１）及び（式２）の導入の説明に用いる図FIG. 2 is a diagram used to explain the introduction of (Equation 1) and (Equation 2).
【図３】（式６）の導入の説明に用いる図FIG. 3 is a diagram used to explain the introduction of (Equation 6).
【図４】ピンホールアレイを構成要素とした本願の画像
入力光学系を示す図FIG. 4 is a diagram showing an image input optical system of the present application having a pinhole array as a component.
【図５】（式３）の導入の説明に用いる図FIG. 5 is a diagram used to explain the introduction of (Equation 3).
【図６】（式４）の導入の説明に用いる図FIG. 6 is a diagram used to explain the introduction of (Equation 4).
【図７】図６の要部拡大図FIG. 7 is an enlarged view of a main part of FIG. 6;
【図８】（式７）の導入の説明に用いる図FIG. 8 is a diagram used to explain the introduction of (Equation 7).
【図９】本願の画像入力光学系を組み込んだ密着型画像
入力装置の断面図FIG. 9 is a sectional view of a contact-type image input device incorporating the image input optical system of the present application.
【図１０】同画像入力装置の分解斜視図FIG. 10 is an exploded perspective view of the image input device.
【図１１】本願の画像入力光学系を組み込んだペン型画
像入力装置の全体図FIG. 11 is an overall view of a pen-type image input device incorporating the image input optical system of the present application.
【図１２】図９のＡ方向から見た拡大図FIG. 12 is an enlarged view seen from the direction A in FIG.
【図１３】（ａ）及び（ｂ）は単レンズを組み込んだ場
合と本願のマイクロレンズアレイを組み込んだ場合の読
み取り画像の違いを示す図13 (a) and 13 (b) are views showing a difference in read image when a single lens is incorporated and when a microlens array of the present application is incorporated.
１…画像情報、２…レンズアレイ、３…光センサアレ
イ、４…ピンホールアレイ、８…ケース、２１…レン
ズ、３１…光センサ、４１…ピンホール、８１…ケース
先端面、８２…ケース先端面の凹部、ａ…レンズアレイ
と画像情報との距離、ｂ…光センサアレイとレンズアレ
イとの距離、ｐ…レンズの配列ピッチ、ｗ…センサの受
光幅、ｂ1…レンズアレイとピンホールアレイとの距
離、ｂ2…ピンホールアレイと光センサアレイとの距
離、ｗ1…センサ３１の受光幅、ｗ2…ピンホールアレイ
のピンホール幅、ｗ3…画像情報の有効幅1 ... Image information, 2 ... Lens array, 3 ... Photosensor array, 4 ... Pinhole array, 8 ... Case, 21 ... Lens, 31 ... Photosensor, 41 ... Pinhole, 81 ... Case tip surface, 82 ... Case tip Recesses on the surface, a ... Distance between lens array and image information, b ... Distance between optical sensor array and lens array, p ... Lens array pitch, w ... Sensor light receiving width, b1 ... Lens array and pinhole array Distance, b2 ... distance between pinhole array and optical sensor array, w1 ... light receiving width of sensor 31, w2 ... pinhole width of pinhole array, w3 ... effective width of image information
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7330022AJPH09171154A (en) | 1995-12-19 | 1995-12-19 | Image input optical system and image input device using the same |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7330022AJPH09171154A (en) | 1995-12-19 | 1995-12-19 | Image input optical system and image input device using the same |
| Publication Number | Publication Date |
|---|---|
| JPH09171154Atrue JPH09171154A (en) | 1997-06-30 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7330022APendingJPH09171154A (en) | 1995-12-19 | 1995-12-19 | Image input optical system and image input device using the same |
| Country | Link |
|---|---|
| JP (1) | JPH09171154A (en) |
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