JP3378921B2 - Print inspection sensor - Google Patents
Print inspection sensorInfo
- Publication number
- JP3378921B2 JP3378921B2 JP35226393A JP35226393A JP3378921B2 JP 3378921 B2 JP3378921 B2 JP 3378921B2 JP 35226393 A JP35226393 A JP 35226393A JP 35226393 A JP35226393 A JP 35226393A JP 3378921 B2 JP3378921 B2 JP 3378921B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light receiving
- receiving element
- axis
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は印刷検査用センサに係
り、特に特定方向に送り移動される印刷紙面上に光を照
射し、紙面からの反射光を検出して印刷面の不良等を検
出するのに好適な構造とした印刷検査用センサに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print inspection sensor, and more particularly to irradiating light onto a printing paper surface which is fed and moved in a specific direction and detecting reflected light from the paper surface to detect a defect on the printing surface. The present invention relates to a print inspection sensor having a suitable structure.
【０００２】[0002]
【従来の技術】印刷面の良否判定を行うために、送り移
動されている印刷紙面上に送り方向と直交する紙面幅方
向に沿って帯状に光を照射し、印刷面からの反射される
光量を検出し、標準印刷面の反射光量と検査印刷面の反
射光量の比較判定を行う方法が知られている。この方法
の実現のために、印刷面への投光と受光をなすセンサが
用いられている。2. Description of the Related Art In order to determine the quality of a printing surface, the amount of light reflected from the printing surface is radiated in a strip shape on the printing paper surface that is being fed and moved along the paper width direction orthogonal to the feeding direction. There is known a method for detecting and detecting and comparing the amount of reflected light on the standard printing surface with the amount of reflected light on the inspection printing surface. In order to realize this method, a sensor that projects and receives light on a printing surface is used.
【０００３】従来、この種の印刷検査用センサとして、
特開平５−７９９９７号公報に開示されているものがあ
る。これは印刷面の幅方向に光を照射する発光部の両側
に複数の受光部を設けている。受光部は多数の受光素子
をプリント基板に列配置して構成され、この円筒状レン
ズアレイを介してプリント基板上の受光素子へ結像させ
るように構成されている。基板上の個々の受光素子は受
光面が平行四辺形形状とされたもので、斜辺が隣り合わ
せとなるように複数配列している。印刷面をこの受光素
子列と直交するように送り、印刷面からの反射光を受光
する際に、受光素子列の走査領域に隙間ができないよう
にし、検出不感帯の発生を防止している。Conventionally, as a print inspection sensor of this type,
There is one disclosed in JP-A-5-79997. This has a plurality of light receiving portions on both sides of a light emitting portion that emits light in the width direction of the printing surface. The light receiving section is configured by arranging a large number of light receiving elements in a row on a printed circuit board, and is configured to form an image on the light receiving elements on the printed circuit board via this cylindrical lens array. Each of the light receiving elements on the substrate has a light receiving surface of a parallelogram shape, and a plurality of light receiving elements are arranged so that their oblique sides are adjacent to each other. The print surface is sent so as to be orthogonal to the light receiving element array, and when the reflected light from the print surface is received, a gap is not formed in the scanning region of the light receiving element array to prevent the detection dead zone from occurring.
【０００４】[0004]
【発明が解決しようとする課題】ところが、従来のセン
サ構造では、受光素子を基板に直列配置した状態で、か
つ受光面が平行四辺形となる形状に形成する必要がある
ため、いわゆる特注の専用受光素子を用いる必要があ
り、したがって製造コストが非常に高くなる問題があっ
た。また、受光素子を実装する基板は直列配置された各
素子受光面を受光軸上に正確に設定する必要があり、基
板面の受光素子が受光軸に直交するよう配置しなければ
ならず、したがってセンサケーシング内で基板を受光軸
に直交配置するよう設置形態が限定されてしまい、セン
サのコンパクト化に限界があった。However, in the conventional sensor structure, it is necessary to form the light receiving surface in a parallelogram shape with the light receiving elements arranged in series on the substrate. Since it is necessary to use a light receiving element, there is a problem that the manufacturing cost becomes very high. Further, the substrate on which the light receiving element is mounted needs to be set accurately on the light receiving axis of each element arranged in series, and the light receiving element on the substrate surface must be placed so as to be orthogonal to the light receiving axis. The installation form is limited so that the substrate is arranged orthogonally to the light receiving axis in the sensor casing, and there is a limit to downsizing the sensor.
【０００５】本発明は、上記従来の問題点に着目して、
受光素子として汎用素子を用いて製造コストを大幅に軽
減し、また受光素子を実装する基板の配置を自由に設定
することによりコンパクト化を図ることができるセンサ
を提供する。 The present invention focuses on the above-mentioned conventional problems,
Manufacturing cost is significantly reduced by using a general-purpose element as a light receiving element
Also, the layout of the board on which the light receiving element is mounted can be freely set.
Sensor that can be made compact by
I will provide a.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る印刷検査用センサは、第１に印刷面の
送り方向を横断する方向に沿って複数の受光素子を配列
し印刷面からの反射光を光学レンズを介して受光する印
刷検査用センサにおいて、受光軸上の前記レンズの結像
面に光散乱器を設け、当該光散乱器を介して前記受光素
子の受光面に散乱反射光を照射可能としたものである。In order to achieve the above object, a printing inspection sensor according to the present invention firstly prints by arranging a plurality of light receiving elements along a direction transverse to a feeding direction of a printing surface. In a print inspection sensor that receives reflected light from a surface through an optical lens, a light scatterer is provided on the image forming surface of the lens on the light receiving axis, and the light receiving surface of the light receiving element is provided through the light scatterer. It is possible to irradiate scattered reflected light.
【０００７】この第１の構成において、前記受光素子を
受光軸から偏位配置し、この受光素子に対して前記光散
乱器からの散乱光を前記偏位配置された受光素子に入射
可能とし、前記受光素子が実装される基板面を受光軸と
平行もしくは鋭角に配置可能とすることができる。In the first structure, the light receiving element is offset from the light receiving axis, and scattered light from the light scatterer can be incident on the light receiving element which is offset with respect to the light receiving element. The surface of the substrate on which the light receiving element is mounted can be arranged parallel to the light receiving axis or at an acute angle.
【０００８】[0008]
【０００９】[0009]
【００１０】[0010]
【作用】上記構成によれば、まず光散乱器を受光軸上に
配置し、これを光学レンズの結像面に設置し、反射光を
散乱させた状態で受光素子の受光面に受光させる。これ
により受光素子の受光面には均一な散乱光が照射され、
受光面を特殊な形態とした専用受光素子を用いなくても
汎用の受光素子によって検出することができる。汎用素
子の使用が可能となるため、センサの主要部を占める受
光素子のコストを大幅に軽減することができ、センサ全
体のコスト低減が可能となる。According to the above construction, first, the light scatterer is arranged on the light receiving axis, this is placed on the image forming surface of the optical lens, and the reflected light is scattered and received by the light receiving surface of the light receiving element. As a result, the light receiving surface of the light receiving element is irradiated with uniform scattered light,
It is possible to detect with a general-purpose light receiving element without using a dedicated light receiving element having a special light receiving surface. Since a general-purpose element can be used, the cost of the light-receiving element that occupies the main part of the sensor can be significantly reduced, and the cost of the sensor as a whole can be reduced.
【００１１】また、散乱器からの散乱光を反射板により
反射させ、受光軸から偏位して配置された受光素子に照
射させると、受光素子の配置が自由にでき、素子を実装
している基板の板面を受光軸と平行若しくは鋭角に設定
することが可能となる。したがってセンサケーシングの
幅員が小さいコンパクト形状とすることができ、狭いス
ペースへのセンサ組込みが容易になるため、特に印刷装
置等への適用が非常に容易になる。Further, when the scattered light from the scatterer is reflected by the reflecting plate and is applied to the light receiving element which is arranged deviated from the light receiving axis, the light receiving element can be arranged freely and the element is mounted. It is possible to set the plate surface of the substrate parallel to the light receiving axis or at an acute angle. Therefore, the width of the sensor casing can be made compact and the sensor can be easily installed in a narrow space, so that the application to a printing device or the like becomes very easy.
【００１２】[0012]
【００１３】[0013]
【実施例】以下に、本発明に係る印刷検査用センサの具
体的実施例を図面を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the print inspection sensor according to the present invention will be described in detail below with reference to the drawings.
【００１４】図１は実施例に係る印刷検査用センサの概
略構成を示している。この図に示すように、当該センサ
は印刷紙１０等の印刷面に対向配置されるもので、印刷
紙１０の送り方向と直交する横断方向に沿うケーシング
１２を有し、その開口を印刷紙１０に向けて配置されて
いる。ケーシング１２には図示しない光源から光ファイ
バーを介して導かれた光を印刷紙１０に照射する投光部
１４が取り付けられている。この投光部１４はケーシン
グ１２のセンターであってその長手方向に光を分布させ
るようにファイバ群１６を配列し、先端の集光レンズ１
８により開口を通じて印刷紙１０の表面幅方向に沿った
照射ラインを形成させるようにしている。このような投
光部１４からの投光軸は印刷紙１０の幅方向に沿った垂
直面上に設定されている。FIG. 1 shows a schematic structure of a print inspection sensor according to an embodiment. As shown in this figure, the sensor is arranged so as to face the printing surface of the printing paper 10 or the like, has a casing 12 along a transverse direction orthogonal to the feeding direction of the printing paper 10, and has an opening formed in the printing paper 10. It is arranged toward. A light projecting unit 14 that irradiates the printing paper 10 with light guided from an unillustrated light source through an optical fiber is attached to the casing 12. The light projecting portion 14 is the center of the casing 12, and the fiber group 16 is arranged so as to distribute the light in the longitudinal direction of the casing 12.
The irradiation line 8 forms an irradiation line along the surface width direction of the printing paper 10 through the opening. The light projecting axis from the light projecting unit 14 is set on a vertical surface along the width direction of the printing paper 10.
【００１５】このような投光部１４の両側、すなわち印
刷紙１０の送り方向における上流側と下流側には、それ
ぞれ受光部２０（２０Ｒ、２０Ｌ）が設けられている。
受光部２０は、その受光軸が投光軸に対して数十度の傾
斜角で印刷紙１０上の光照射ラインに向けられるよう傾
斜されている。このためケーシング１２にはケーシング
開口を先細り形状にするサイドステー２２が設けられ、
その内面に受光部２０を取り付けるようにしている。両
サイドステー２２の先端部には投光軸と直交するように
配置され光を透過するセンサガラス２４が取り付けら
れ、開口を覆い内部を密閉している。したがって、投光
部１４から照射された光はセンサガラス２４を介して印
刷紙１０の印刷面に照射され、この照射ラインからの反
射光はやはりセンサガラス２４を介して受光部２０に入
射されるものとなっている。Light receiving portions 20 (20R, 20L) are provided on both sides of the light projecting portion 14, that is, on the upstream side and the downstream side in the feeding direction of the printing paper 10, respectively.
The light receiving section 20 is tilted so that its light receiving axis is directed to the light irradiation line on the printing paper 10 at an inclination angle of several tens of degrees with respect to the light projecting axis. For this reason, the casing 12 is provided with a side stay 22 that makes the casing opening tapered,
The light receiving section 20 is attached to the inner surface thereof. A sensor glass 24, which is arranged so as to be orthogonal to the light projecting axis and is transparent to light, is attached to the front ends of both side stays 22, and covers the opening to seal the inside. Therefore, the light emitted from the light projecting unit 14 is emitted to the printing surface of the printing paper 10 via the sensor glass 24, and the reflected light from this irradiation line is also incident on the light receiving unit 20 via the sensor glass 24. It has become a thing.
【００１６】受光部２０の具体的構成を図２を参照して
説明する。受光部２０は印刷紙１０からの反射光を最初
に入射する光学レンズ２６を備えている。この光学レン
ズ２６はＳＬＡと称されるセルホックレンズアレイによ
って構成すればよく、円柱レンズ群の光軸が受光軸に沿
うように設定されて、透過光を所定の焦点距離で結像さ
せるものとしている。そして、受光軸上であって前記光
学レンズ２６の結像面部分には光散乱器２８が設置され
ている。これは受光軸と直交配置される光散乱板３０と
これを取囲む散乱光反射板３２によって構成されたもの
で、積分球のごとき作用によって光が反射を繰り返すよ
うにしている。そして前記散乱板３０の入射口からオフ
セットされるとともに散乱光反射板３２に対面して受光
素子３４が配置され、散乱反射光が受光素子３４の受光
面に均一に当るようにしている。このような光散乱器２
８を介して受光させるようにしているため、受光素子３
４は汎用のフォトダイオードを使用することができ、ま
た散乱光反射板３２からの反射光を受光させるため受光
素子３４は受光軸から偏位配置されている。そして、受
光素子３４はプリント基板３６に実装されるものである
が、この基板３６は受光素子３４の配置の自由度のた
め、実施例では基板３６の板面が投光軸と平行になるよ
うにケーシング１２の内部に取り付けている。したがっ
て、プリント基板３６を受光軸と直交配置させる必要が
なく、これによりケーシング１２の幅寸法を大幅に小さ
くすることが可能となっている。プリント基板３６には
配線コネクタ３８が取り付けられ、これを介してケーシ
ング１２の上端面側から検出信号を出力させることがで
きる。A specific structure of the light receiving section 20 will be described with reference to FIG. The light receiving unit 20 includes an optical lens 26 that first enters the reflected light from the printing paper 10. The optical lens 26 may be formed of a self-hoc lens array called SLA, and the optical axis of the cylindrical lens group is set so as to be along the light receiving axis so that the transmitted light is imaged at a predetermined focal length. There is. A light scatterer 28 is installed on the light receiving axis and on the image plane of the optical lens 26. This is composed of a light-scattering plate 30 arranged orthogonal to the light-receiving axis and a scattered-light reflecting plate 32 surrounding the light-scattering plate 30. Light is repeatedly reflected by the action of an integrating sphere. The light receiving element 34 is arranged so as to be offset from the entrance of the scattering plate 30 and face the scattered light reflecting plate 32 so that the scattered reflected light uniformly strikes the light receiving surface of the light receiving element 34. Such a light scatterer 2
Since the light is received via 8, the light receiving element 3
4 can use a general-purpose photodiode, and the light-receiving element 34 is arranged deviated from the light-receiving axis in order to receive the reflected light from the scattered-light reflecting plate 32. The light receiving element 34 is mounted on the printed circuit board 36. Because of the degree of freedom of arrangement of the light receiving element 34, the board surface of the substrate 36 is parallel to the light projecting axis in the embodiment. It is attached inside the casing 12. Therefore, it is not necessary to dispose the printed circuit board 36 orthogonally to the light receiving axis, which allows the width dimension of the casing 12 to be significantly reduced. A wiring connector 38 is attached to the printed board 36, and a detection signal can be output from the upper end surface side of the casing 12 via the wiring connector 38.
【００１７】[0017]
【００１８】[0018]
【００１９】なお、受光部２０は図１（１）に示すよう
に、光学レンズ２６および光散乱器２８をユニットとし
て取り付けブラケット４６を介してサイドステー２２に
固定するようにし、かつブラケット４６位置をサイドス
テー２２の外面から調整できるように引きネジ４８、押
しネジ５０を設け、このネジ調整で受光軸の設定を可能
としている。As shown in FIG. 1 (1), the light receiving section 20 is configured such that the optical lens 26 and the light scatterer 28 are fixed as a unit to the side stay 22 via the mounting bracket 46, and the position of the bracket 46 is fixed. A pull screw 48 and a push screw 50 are provided so as to be adjustable from the outer surface of the side stay 22, and the light receiving axis can be set by adjusting these screws.
【００２０】このような実施例によれば、受光素子３４
に直接受光させるのではなく、光散乱器２８により結像
反射光を散乱処理してこれを反射入射させるようにした
ので、汎用受光素子を使用することができる。また、受
光素子３４を受光軸から偏位配置させることができるた
め、これが実装されるプリント基板３６の配置自由度が
高くなり、実施例では投光軸に平行に基板３６を設置
し、センサ自体のコンパクト化が図られている。According to such an embodiment, the light receiving element 34
Since the image-scattering reflected light is scattered by the light scatterer 28 so that it is reflected and made incident, the general-purpose light-receiving element can be used. Further, since the light receiving element 34 can be deviated from the light receiving axis, the degree of freedom of arrangement of the printed circuit board 36 on which the light receiving element 34 is mounted is increased. In the embodiment, the substrate 36 is installed in parallel with the light projecting axis, and the sensor itself. Is being made compact.
【００２１】[0021]
【発明の効果】以上説明したように、本発明によれば、
受光部に光散乱器を配置し、散乱させた光を受光素子に
入射させるようにしているため使用する受光素子は汎用
製品で足り、センサコストの低減を図ることができると
ともに、受光素子の配置が自由になりこれを実装するプ
リント基板の板面を受光軸と平行若しくは鋭角に配置す
ることができるので、センサのコンパクト化を図ること
ができる。As described above, according to the present invention,
Since a light scatterer is arranged in the light receiving part and the scattered light is made incident on the light receiving element, a general-purpose product is sufficient for the light receiving element to be used, which can reduce the sensor cost and the arrangement of the light receiving element. Since the plate surface of the printed circuit board on which the sensor is mounted can be freely arranged, the sensor can be made compact because the plate surface of the printed circuit board can be arranged parallel to the light receiving axis or at an acute angle.
【図１】 実施例に係るセンサの断面図および正面図で
ある。FIG. 1 is a sectional view and a front view of a sensor according to an embodiment.
【図２】 受光部の配置構成図である。FIG. 2 is a layout configuration diagram of a light receiving unit.
１０ 印刷紙、１２ ケーシング、１４ 投光部、１６ 光
ファイバ群、１８ 集光レンズ、２０ 受光部、２２ サ
イドステー、２４ センサガラス、２６ 光学レンズ、２
８ 光散乱器、３０ 光散乱板、３２ 散乱光反射板、３
４ 受光素子、３６プリント基板、３８ 配線コネクタ、
４６ 取り付けブラケット、４８ 引きネジ、５０ 押し
ネジ。 10 printing paper, 12 casing, 14 light projecting section, 16 optical fiber group, 18 condensing lens, 20 light receiving section, 22 side stays, 24 sensor glass, 26 optical lens, 2
8 light scatterer, 30 light scatterer, 32 scattered light reflector, 3
4 light receiving element, 36 printed circuit board, 38 wiring connector ,
46 mounting bracket, 48 draw screw, 50 push screw .
Claims (2)
って複数の受光素子を配列し印刷面からの反射光を光学
レンズを介して受光する印刷検査用センサにおいて、受
光軸上の前記レンズの結像面に光散乱器を設け、当該光
散乱器を介して前記受光素子の受光面に散乱反射光を照
射可能としたことを特徴とする印刷検査用センサ。 1. A printing inspection sensor in which a plurality of light receiving elements are arranged along a direction crossing a feeding direction of a printing surface, and the reflected light from the printing surface is received via an optical lens, wherein the lens on the light receiving axis is provided. A print inspection sensor, characterized in that a light scatterer is provided on the image forming surface, and the scattered light can be irradiated onto the light receiving surface of the light receiving element through the light scatterer.
し、この受光素子に対して前記光散乱器からの散乱光を
前記偏位配置された受光素子に入射可能とし、前記受光
素子が実装される基板面を受光軸と平行もしくは鋭角に
配置可能としたことを特徴とする請求項１に記載の印刷
検査用センサ。 2. The light receiving element is arranged offset from the light receiving axis, and the scattered light from the light scatterer can be incident on the light receiving element, and the light receiving element is mounted on the light receiving element. 2. The print inspection sensor according to claim 1, wherein the substrate surface to be formed can be arranged in parallel or at an acute angle with the light receiving axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35226393A JP3378921B2 (en) | 1993-12-29 | 1993-12-29 | Print inspection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35226393A JP3378921B2 (en) | 1993-12-29 | 1993-12-29 | Print inspection sensor |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002151292A Division JP2003050207A (en) | 2002-05-24 | 2002-05-24 | Sensor for print inspection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07198625A JPH07198625A (en) | 1995-08-01 |
| JP3378921B2 true JP3378921B2 (en) | 2003-02-17 |
Family
ID=18422868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35226393A Expired - Fee Related JP3378921B2 (en) | 1993-12-29 | 1993-12-29 | Print inspection sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3378921B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004021600A1 (en) * | 2004-05-03 | 2005-12-08 | Gretag-Macbeth Ag | Device for inline monitoring of print quality in sheetfed offset presses |
-
1993
- 1993-12-29 JP JP35226393A patent/JP3378921B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07198625A (en) | 1995-08-01 |
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