JP2021117208A - Printing plate inspection device and inspection method - Google Patents

Printing plate inspection device and inspection method Download PDF

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JP2021117208A
JP2021117208A JP2020012955A JP2020012955A JP2021117208A JP 2021117208 A JP2021117208 A JP 2021117208A JP 2020012955 A JP2020012955 A JP 2020012955A JP 2020012955 A JP2020012955 A JP 2020012955A JP 2021117208 A JP2021117208 A JP 2021117208A
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printing plate
dimensional information
shape
printing
convex portion
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JP6762444B1 (en
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隆 八島
Takashi Yashima
隆 八島
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Sakata Inx Corp
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Sakata Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination

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Abstract

To provide an inspection device and inspection method that require only a simple device, and allow for an analysis by a smaller data volume, reduction in amount of memory, and more quicker processing.SOLUTION: A printing plate surface shape inspection device has: a processing device that detects a convex part 2 of a printing plate 1 surface by a camera 4, obtains a position of a printing plate surface having the convex part higher than a certain height as a line segment serving as primary-order information along a width direction; a processing device that juxtaposes a plurality line segments obtained through a measurement every time the printing plate and/or measurement device are/is moved vertically with respect to the width direction of the printing plate surface by a movement device in a direction where the measurement device relatively moves, and forms a surface shape of the convex part higher than the certain height of the printing plate surface as two-dimensional information; and a determination device that compares the two-dimensional information with two-dimensional information serving as an intended printing pattern, and determines propriety of a convex part shape of the printing plate.SELECTED DRAWING: Figure 3

Description

本発明は、印刷版表面の検査装置及びその方法に関する。 The present invention relates to an inspection device for the surface of a printing plate and a method thereof.

印刷版を用いて印刷を行う場合、新たに作成した印刷版と原稿との間に齟齬がないか、文字や絵に欠け等がないか、また印刷版に傷等がないかを確認する必要がある。また、印刷版を使用するにつれて、凸部の一部が磨耗等により欠けたり、除去が困難な汚れが付着することがある。
特許文献１には、平面状の印刷版の表面状態を検査する表面検査装置であって、検査対象物で正反射された正反射光、拡散反射された拡散光を利用するものが開示されている。
特許文献２には、スリーブ印刷版の検査装置であって、回転ドラムの円筒面に装着されたスリーブ印刷版の径方向位置情報と、回転ドラムの回転方向位置情報と、軸線方向位置情報を得て、演算部において凸版の形状を再現するものが開示されている。 When printing using a printing plate, it is necessary to check that there is no discrepancy between the newly created printing plate and the manuscript, that there are no defects in characters or pictures, and that there are no scratches on the printing plate. There is. Further, as the printing plate is used, a part of the convex portion may be chipped due to wear or the like, or stains that are difficult to remove may adhere.
Patent Document 1 discloses a surface inspection device for inspecting the surface state of a flat printing plate, which utilizes specularly reflected specular light and diffusely reflected diffused light on the inspection object. There is.
Patent Document 2 is an inspection device for a sleeve printing plate, and obtains radial position information of a sleeve printing plate mounted on a cylindrical surface of a rotating drum, rotational position information of a rotating drum, and axial position information. Therefore, a calculation unit that reproduces the shape of the letterpress is disclosed.

また特許文献３に記載のように、印刷版の凸部を３Ｄスキャン装置等の立体形状を検知する手段により検知して、その印刷版により、目的とする印刷面が得られるか否かを求める方法及び装置が知られている。
しかし、作成した印刷版による印刷が、原稿に沿って、意図した通りであるかを確認するための３Ｄスキャンによる印刷版の解析には、大掛かりなスキャン装置を必要とすると共に、完全な３Ｄスキャンが完了していることを前提として演算をするので、扱うデータ量が膨大となるため、必要なメモリー量も多くなり、かつ処理に長時間を要する。
そして３Ｄスキャンを行うための、一般的な３Ｄスキャン装置は高精度な装置であって、印刷版上に観測点を複数持って観測結果を重畳することがあり、その精度担保にはより高価な装置を要する。仮に観測点が１つであると、十分な精度が得られない。
そこで、より簡易及び安価な装置を使用でき、より少ないデータ量での解析、メモリー量の削減、より迅速な処理が可能となる検査装置及び検査方法を提供することが求められている。 Further, as described in Patent Document 3, the convex portion of the printing plate is detected by a means for detecting a three-dimensional shape such as a 3D scanning device, and it is determined whether or not the desired printing surface can be obtained by the printing plate. Methods and devices are known.
However, the analysis of the printing plate by 3D scanning to confirm whether the printing by the created printing plate is as intended along the original requires a large-scale scanning device and a complete 3D scanning. Since the calculation is performed on the premise that the above is completed, the amount of data to be handled becomes enormous, the amount of memory required also increases, and the processing takes a long time.
A general 3D scanning device for performing 3D scanning is a high-precision device, which may have a plurality of observation points on a printing plate and superimpose observation results, which is more expensive to guarantee the accuracy. Requires equipment. If there is only one observation point, sufficient accuracy cannot be obtained.
Therefore, it is required to provide an inspection device and an inspection method capable of using a simpler and cheaper device, analyzing with a smaller amount of data, reducing the amount of memory, and performing faster processing.

特開２００６−４６９４１号公報Japanese Unexamined Patent Publication No. 2006-46941 特開２０１０−２１４９４４号公報Japanese Unexamined Patent Publication No. 2010-214944 特許第６２５８６９９号公報Japanese Patent No. 6258699

本発明の課題は、より簡易及び安価な装置を使用でき、より少ないデータ量での解析、メモリー量の削減、線分のスキャンと同時に演算して、より迅速な処理が可能となる検査装置及び検査方法を提供することである。 The subject of the present invention is an inspection device capable of using a simpler and cheaper device, analyzing with a smaller amount of data, reducing the amount of memory, and calculating at the same time as scanning a line segment to enable faster processing. To provide an inspection method.

本発明者等は、上記の課題を解決するために鋭意検討した結果、大掛かりな装置を必要とし、膨大なデータ量、メモリー量、長時間の処理時間を必要とする３Ｄスキャンを必要としない、二次元情報のみに基づく以下の検査装置及び検査方法によって、上記課題を解決しうることを見出した。
１．印刷版表面形状の検査装置であって、
凸部を有する印刷版表面の凸部を検知し、
得られた検知結果から、印刷版表面の一定高さの凸部の位置情報を得て、
その位置情報に基づき、一定高さ以上の凸部を有する印刷版表面の位置を幅方向に沿った一次元の情報である線分として得る処理装置１と、
計測装置を、印刷版表面の幅方向に対して垂直方向に相対的に移動させる移動装置と、
移動装置により、印刷版及び／又は計測装置を、印刷版表面の幅方向に対して垂直に移動する毎に計測して得た複数の線分を、計測装置が相対的に移動する方向に並べて、印刷版表面の該一定高さ以上の凸部の表面形状を二次元の情報として形成する処理装置２と、
該二次元の情報と、目的とする印刷パターンである二次元の情報を対比して、印刷版の凸部形状の適否を判断する判断装置を有する、印刷版表面形状の検査装置。
２．印刷版表面形状の検査方法であって、
凸部を有する印刷版表面の凸部を検知し、
得られた検知結果から、印刷版表面の一定高さの凸部の位置情報を得て、
その位置情報に基づき、一定高さ以上の凸部を有する印刷版表面の位置を幅方向に沿った一次元の情報である線分として得る処理工程１と、
計測装置を、印刷版表面の幅方向に対して垂直方向に相対的に移動させる移動装置と、
移動装置により、印刷版及び／又は計測装置を、印刷版表面の幅方向に対して垂直に移動する毎に計測して得た複数の線分を、計測装置が相対的に移動する方向に並べて、印刷版表面の該一定高さ以上の凸部の表面形状を二次元の情報として形成する処理工程２と、
該二次元の情報と、目的とする印刷パターンである二次元の情報を対比して、印刷版の凸部形状の適否を判断する判断工程を有する、印刷版表面形状の検査方法。 As a result of diligent studies to solve the above problems, the present inventors require a large-scale device, do not require a huge amount of data, a large amount of memory, and a 3D scan that requires a long processing time. It has been found that the above problems can be solved by the following inspection devices and inspection methods based only on two-dimensional information.
1. 1. It is an inspection device for the surface shape of the printing plate.
Detects the convex part on the surface of the printing plate with the convex part,
From the obtained detection results, the position information of the convex portion of a certain height on the surface of the printing plate is obtained.
Based on the position information, the processing device 1 that obtains the position of the surface of the printing plate having a convex portion having a certain height or more as a line segment that is one-dimensional information along the width direction.
A moving device that moves the measuring device in the direction perpendicular to the width direction of the printing plate surface, and
A plurality of line segments obtained by measuring each time the printing plate and / or the measuring device is moved perpendicularly to the width direction of the printing plate surface by the moving device are arranged in the direction in which the measuring device moves relatively. , A processing device 2 that forms the surface shape of a convex portion having a certain height or more on the surface of the printing plate as two-dimensional information.
A printing plate surface shape inspection device having a determination device for determining the suitability of the convex shape of the printing plate by comparing the two-dimensional information with the two-dimensional information which is a target printing pattern.
2. This is a method for inspecting the surface shape of the printing plate.
Detects the convex part on the surface of the printing plate with the convex part,
From the obtained detection results, the position information of the convex portion of a certain height on the surface of the printing plate is obtained.
Based on the position information, the processing step 1 of obtaining the position of the surface of the printing plate having a convex portion having a certain height or more as a line segment which is one-dimensional information along the width direction.
A moving device that moves the measuring device in the direction perpendicular to the width direction of the printing plate surface, and
A plurality of line segments obtained by measuring each time the printing plate and / or the measuring device is moved perpendicularly to the width direction of the printing plate surface by the moving device are arranged in the direction in which the measuring device moves relatively. The processing step 2 of forming the surface shape of the convex portion having a certain height or more on the surface of the printing plate as two-dimensional information.
A method for inspecting the surface shape of a printing plate, which comprises a determination step of comparing the two-dimensional information with the two-dimensional information which is a target printing pattern to determine the suitability of the convex shape of the printing plate.

本発明の印刷版検査装置及び方法によれば、より簡易な装置で、より少ないデータ量での解析、メモリー量の削減、より迅速な処理が可能となり、かつ十分に高い検査精度とすることができる。 According to the printing plate inspection apparatus and method of the present invention, it is possible to perform analysis with a smaller amount of data, reduce the amount of memory, perform faster processing, and achieve sufficiently high inspection accuracy with a simpler apparatus. can.

本発明の検査原理を示す図The figure which shows the inspection principle of this invention ３次元形状をスキャンする従来技術の検査原理を示す図The figure which shows the inspection principle of the prior art for scanning a three-dimensional shape. 本発明により、植物の印刷版１の検査を行う状態を示した図The figure which showed the state which inspected the printing plate 1 of a plant by this invention. 検知結果からｚ値の求め方を示す図The figure which shows the method of obtaining the z value from the detection result 第４図の変形例を示す図The figure which shows the modification of FIG.

［本発明による検査原理］
図１に示すように、印刷版表面を測定対象面とし、これを被写体として光を照射し、その反射光を検知する。その検知によりｘ−ｚ軸での断面形状をスキャンする。その断面形状の中で、凸部の一定の高さ（敷居高さ）以上の部分を測定対象面の線分として検知する。
ついでｙ軸方向に移動した箇所に対しても同様にスキャンして測定対象面の線分を検知する。この処理を繰り返し行なうことにより、一定の高さ以上で、かつｘ―ｙ平面に平行な面を測定面積分として検出する。
このようにしてｙ軸方向に積分することにより、印刷版の一定高さ以上の凸部の形状を検知する。
その形状と、予め保存した望ましい形状を比較して、印刷版の適否を判断する。またはその形状を基にしてインクジェット印刷することにより、校正用原稿を作成する。 [Inspection Principle According to the Present Invention]
As shown in FIG. 1, the surface of the printing plate is set as the measurement target surface, light is irradiated with this as the subject, and the reflected light is detected. The detection scans the cross-sectional shape on the x-z axis. In the cross-sectional shape, a portion above a certain height (threshold height) of the convex portion is detected as a line segment of the measurement target surface.
Then, the line segment of the measurement target surface is detected by scanning the portion moved in the y-axis direction in the same manner. By repeating this process, a plane having a certain height or higher and parallel to the xy plane is detected as a measurement area.
By integrating in the y-axis direction in this way, the shape of the convex portion having a certain height or more of the printing plate is detected.
The suitability of the printing plate is determined by comparing the shape with the desired shape stored in advance. Alternatively, a proofreading manuscript is created by inkjet printing based on the shape.

［従来の３次元データに基づく検査原理］
図２に示すように、測定対象面を有する印刷版を被写体として、３次元で解析することにより、その印刷版の３次元データを得る。その３次元データの中のｚ軸方向の高さが一定以上の部分を取り出し、それを平面化することによりｘ−ｙ面データを得る。 [Inspection principle based on conventional 3D data]
As shown in FIG. 2, a three-dimensional data of the print plate is obtained by analyzing the print plate having the measurement target surface as a subject in three dimensions. A portion of the three-dimensional data having a height above a certain level in the z-axis direction is taken out and flattened to obtain xy plane data.

［印刷版］
本発明の検査装置及び検査方法により検査の対象となる印刷版は、フレキソ印刷等を行うための印刷版である。
そのような印刷版の材質、形状、大きさ等は、従来から公知のものであれば良い。 [Print version]
The printing plate to be inspected by the inspection apparatus and inspection method of the present invention is a printing plate for performing flexographic printing or the like.
The material, shape, size, etc. of such a printing plate may be any conventionally known material.

本発明の検査装置は、処理装置１、移動装置、処理装置２、判断装置を含むものである。
また本発明の検査方法は、上記の各装置による各処理工程を含むものである。 The inspection device of the present invention includes a processing device 1, a mobile device, a processing device 2, and a determination device.
Further, the inspection method of the present invention includes each processing step by each of the above-mentioned devices.

［処理装置１］
処理装置１は、平面上又は曲面上に形成された印刷版の凸部の位置を計測・検知できる、公知の非接触の計測装置を採用できる。中でも三次元レーザー表面測定法、アクティブステレオ法、スリット光投影法（光切断法）、スポット光投影法、空間コード化パターン光投影法を採用する計測装置が好ましく、さらに三次元レーザー表面測定法を採用する装置が好ましい。 [Processing device 1]
As the processing device 1, a known non-contact measuring device capable of measuring and detecting the position of a convex portion of a printing plate formed on a flat surface or a curved surface can be adopted. Among them, a measuring device that employs a three-dimensional laser surface measurement method, an active stereo method, a slit light projection method (light cutting method), a spot light projection method, and a spatially coded pattern light projection method is preferable, and a three-dimensional laser surface measurement method is further used. The device to be adopted is preferable.

また、そのような非接触の計測法では、例えば平面の印刷版を水平な基台に載置し、この印刷版表面の上方から印刷版表面に対して垂直に光を照射する。このとき、真空引き装置等を使用して、印刷版を基台に吸着させても良い。この反射光を別に設けたカメラで検出する。さらに印刷版の複数の幅方向（ｘ方向）に、一定の長さ方向（ｙ方向）毎に平行にスキャンする。これによって、ｘ（幅）−ｚ（高さ）面の二次元の形状がスキャンの測定結果として得られる。
光源としてレーザー光を使用しても良く、白色等のＬＥＤを光源とし、光源の前にスリットを設けることにより、ｘ軸に平行な線状の光として、これを印刷版に照射しても良い。
必要に応じて、カメラのみ、又は光源とカメラの両方を印刷版の端からｙ方向に移動させて、印刷版の端からスキャンを開始する。
また、印刷版表面の形状が曲面であり、印刷版がローラ表面に固定して印刷を行なうためのものであるときには、上記の平面の印刷版の例において、ｙ軸を直線ではなく円弧状とした状態のものとなる。
このような曲面の印刷版であっても、上記の平面の場合と同じであり、基台に固定した印刷版表面に対して、印刷版の複数の幅方向（ｘ方向）に、一定の円弧方向（ｙ方向）毎に平行にスキャンする。これによって、ｘ（幅）−ｚ（高さ）面の二次元の形状がスキャンの測定結果として得られる。 Further, in such a non-contact measurement method, for example, a flat printing plate is placed on a horizontal base, and light is irradiated perpendicularly to the printing plate surface from above the printing plate surface. At this time, the printing plate may be adsorbed on the base by using a vacuuming device or the like. This reflected light is detected by a camera provided separately. Further, scanning is performed in parallel to a plurality of width directions (x directions) of the printing plate in certain length directions (y directions). As a result, the two-dimensional shape of the x (width) -z (height) plane is obtained as the measurement result of the scan.
Laser light may be used as the light source, or a white LED may be used as the light source, and a slit may be provided in front of the light source to irradiate the printing plate with linear light parallel to the x-axis. ..
If necessary, the camera alone or both the light source and the camera are moved in the y direction from the edge of the printing plate to start scanning from the edge of the printing plate.
Further, when the shape of the printing plate surface is a curved surface and the printing plate is fixed to the roller surface for printing, in the above-mentioned flat printing plate example, the y-axis is not a straight line but an arc shape. It will be in the state of being printed.
Even in the case of a printing plate having such a curved surface, it is the same as in the case of the above-mentioned flat surface, and a constant arc is formed in a plurality of width directions (x directions) of the printing plate with respect to the surface of the printing plate fixed to the base. Scan in parallel for each direction (y direction). As a result, the two-dimensional shape of the x (width) -z (height) plane is obtained as the measurement result of the scan.

処理装置１は、上記の計測装置により得た一つの幅方向毎の測定結果から、予め設定された高さ（ｚ方向）以上を、一次元の情報である測定面線分として検知し抽出する（処理工程１）。
本発明において一次元の情報を得るためには、まず、印刷版をｘ−ｚ面で切断した断面図に相当する実質的に二次元の情報を得ることが必要となる。但し、印刷版を立体的に再現する三次元の情報までは必要としない。
上記の非接触の計測装置により計測された結果は、印刷版表面の凹凸形状であり、印刷版の底面をあわせて、実質的に印刷版の凸部の位置を含む上記断面図である。
その情報における印刷版の長さ方向に伸びた線状のスキャン部分のうち、印刷版の表面が一定高さ以上となる箇所を線分として検知する。
なお、印刷版の全面を対象としてスキャンしてもよく、また印刷版における凸部が形成された箇所のみを対象としてスキャンすることにより、処理装置１による処理時間を短縮してもよい。
また多色刷り用の印刷版であれば、色毎に必要な印刷版を順次検査できる。 The processing device 1 detects and extracts a preset height (z direction) or higher as a measurement surface line segment which is one-dimensional information from the measurement results for each width direction obtained by the above measuring device. (Processing step 1).
In order to obtain one-dimensional information in the present invention, it is first necessary to obtain substantially two-dimensional information corresponding to a cross-sectional view obtained by cutting a printing plate on an xz plane. However, it does not require three-dimensional information that reproduces the printing plate in three dimensions.
The result measured by the non-contact measuring device is the uneven shape of the surface of the printing plate, and is the cross-sectional view including the position of the convex portion of the printing plate substantially including the bottom surface of the printing plate.
Among the linear scan portions extending in the length direction of the printing plate in the information, the portion where the surface of the printing plate is at least a certain height is detected as a line segment.
The entire surface of the printing plate may be scanned, or the processing time by the processing apparatus 1 may be shortened by scanning only the portion of the printing plate on which the convex portion is formed.
Further, if it is a printing plate for multicolor printing, the required printing plate can be inspected sequentially for each color.

［移動装置］
続けて、移動装置によって、計測装置を長さ方向（ｙ方向）に、又は印刷版が曲面の場合には円弧方向に、一定距離移動させ、同じように印刷版のスキャンを行う。印刷版が曲面の場合には、印刷版を固定した基台ごと回転させて、固定した計測装置に対して相対的に印刷版表面を移動させることができる。
その後、再び処理装置１によって測定面における一定高さ以上の線分を抽出する。これらの工程を、計測装置が印刷版の反対端に達するまで繰り返して行う。
この場合の一定距離とは、目的とする凸部の表面形状を十分に再現できる程度に僅かに離れた距離であり、０．３ｍｍ以下である。例えば一定距離が大きい場合には、最終的に検知して得られる凸部の表面形状は、各線分からなる縞模様が目立つ形状となり、印刷版の凸部が予定通りに形成されたかどうかを確実に判断することが困難になる。 [Mobile device]
Subsequently, the moving device moves the measuring device in the length direction (y direction), or in the arc direction when the printing plate is a curved surface, by a certain distance, and scans the printing plate in the same manner. When the printing plate is a curved surface, the printing plate surface can be moved relative to the fixed measuring device by rotating the printing plate together with the fixed base.
After that, the processing device 1 again extracts a line segment having a height above a certain level on the measurement surface. These steps are repeated until the measuring device reaches the opposite end of the printing plate.
The constant distance in this case is a distance slightly separated so that the surface shape of the target convex portion can be sufficiently reproduced, and is 0.3 mm or less. For example, when a certain distance is large, the surface shape of the convex portion finally detected becomes a shape in which the striped pattern consisting of each line segment is conspicuous, and it is surely whether or not the convex portion of the printing plate is formed as planned. It becomes difficult to judge.

［処理装置２］
処理装置２は、得られた複数の線分を計測装置が相対的に移動する方向に並べて、印刷版表面の該一定高さ以上の凸部の表面形状を二次元の情報として形成する（処理工程２）装置である。
処理装置１により得られた各線分を上記移動装置による一定距離毎に並べることによって、印刷版１表面の凸部２の形状を再現することができる。
つまり、印刷版の表面における一定高さ以上の線分が、印刷版の幅方向に向けて平行に並ぶことになる。多数回のスキャンが小さい幅で印刷版の幅方向に移動する毎に行われる場合には、それにより得られた多くの上記の線分が集合して、あたかも平面形状のような図が形成されることになる。
その平面形状が本発明でいう二次元の情報となる。 [Processing device 2]
The processing device 2 arranges the obtained plurality of line segments in the direction in which the measuring device relatively moves, and forms the surface shape of the convex portion of the printing plate surface having a certain height or more as two-dimensional information (processing). Step 2) This is an apparatus.
By arranging the line segments obtained by the processing device 1 at regular intervals by the moving device, the shape of the convex portion 2 on the surface of the printing plate 1 can be reproduced.
That is, line segments having a certain height or more on the surface of the printing plate are lined up in parallel in the width direction of the printing plate. When a large number of scans are performed each time a small width is moved in the width direction of the printing plate, many of the above-mentioned line segments obtained thereby are aggregated to form a diagram as if it were a plane shape. Will be.
The planar shape becomes the two-dimensional information referred to in the present invention.

［判断装置］
判断装置は、処理装置２で得られた二次元の情報と、目的とする印刷パターンである二次元の情報を対比して、印刷版の凸部形状の適否を判断する。
判断装置には、予め、得ようとする印刷パターンが保存されている。その判断装置にて、この印刷パターンと上記処理装置２により得られた二次元の情報である凸部の平面形状とを対比する。その結果として、上記印刷パターンと上記平面形状が完全に一致して、その印刷版により印刷されて得た印刷パターンが、上記の予め保存された印刷パターンと一致すると判断される場合は印刷版の凸部形状を適と判断する。また両者が一致せず、印刷版上の凸部の形状が、上記印刷パターンに対して部分的にでも欠けていたり、膨出していたりする場合には、不適と判断する。
また、上記処理装置２により得られた二次元の情報である凸部の平面形状に基づいて、別に接続したインクジェット印刷装置により印刷を行って校正用等の原稿等とすることもできる。多色刷り用の印刷版であれば、各色の印刷版全てについて上記の二次元の情報を得た上で、これらの情報を元にインクジェット印刷装置により多色刷りしても良い。
このようにインクジェット印刷する場合には、判断装置による自動的な判断に加えて、又は自動的な判断とは別に、印刷面を目視にて確認することにより印刷版の適否を確認することもできる。 [Judgment device]
The determination device compares the two-dimensional information obtained by the processing apparatus 2 with the two-dimensional information which is the target printing pattern, and determines the suitability of the convex portion shape of the printing plate.
The printing pattern to be obtained is stored in the determination device in advance. The determination device compares this print pattern with the planar shape of the convex portion, which is the two-dimensional information obtained by the processing device 2. As a result, when the print pattern and the plane shape completely match, and it is determined that the print pattern obtained by printing by the printing plate matches the pre-stored print pattern, the printing plate is used. Judge that the convex shape is appropriate. Further, if the two do not match and the shape of the convex portion on the printing plate is partially missing or bulging with respect to the printing pattern, it is judged to be unsuitable.
Further, based on the planar shape of the convex portion, which is the two-dimensional information obtained by the processing device 2, printing can be performed by a separately connected inkjet printing device to obtain a document for proofreading or the like. If it is a printing plate for multicolor printing, the above two-dimensional information may be obtained for all the printing plates of each color, and then multicolor printing may be performed by an inkjet printing apparatus based on this information.
In the case of inkjet printing in this way, the suitability of the printing plate can be confirmed by visually checking the printed surface in addition to the automatic judgment by the judgment device or separately from the automatic judgment. ..

このように、三次元の形状を測定できる計測装置を使用しても、毎回のスキャンによる計測のデータから取り出す情報は、印刷版を輪切りにしたような二次元の情報を基礎とする。
仮に、毎回のスキャンにより得た印刷版を輪切りにしたようなデータを、毎回のスキャン毎に重ねると、印刷版自体を再現する情報となり、三次元の情報となる。
計測データをこのように処理して三次元のデータを得ると、印刷版を俯瞰するように、立体形状を得ることができるが、計測、演算、三次元の形状の復元に至るまで膨大な情報を処理することになり、各段階全てに過剰に時間を費やしたり、処理する装置が大掛かりなものになったりする。
そのため本発明では、三次元の情報ではなく、敢えて二次元の情報を利用することで、より簡易な装置による、より少ないデータ量での解析、メモリー量の削減、より迅速な処理を可能とした。 In this way, even if a measuring device capable of measuring a three-dimensional shape is used, the information extracted from the measurement data by each scan is based on the two-dimensional information as if the printing plate was sliced.
If the data obtained by slicing the print plate obtained by each scan is superimposed on each scan, the information reproduces the print plate itself and becomes three-dimensional information.
By processing the measurement data in this way to obtain three-dimensional data, it is possible to obtain a three-dimensional shape as if looking down at the printing plate, but there is a huge amount of information from measurement, calculation, and restoration of the three-dimensional shape. Will be processed, and excessive time will be spent on each stage, and the processing equipment will be large-scale.
Therefore, in the present invention, by intentionally using two-dimensional information instead of three-dimensional information, it is possible to analyze with a smaller amount of data, reduce the amount of memory, and perform faster processing by a simpler device. ..

図３は、植物模様の印刷版１の検査を行う状態を示した図である。
印刷版１表面には、植物模様を印刷するための凸部２が設けられている。印刷時には、この凸部２表面に付着したインキ組成物が、紙等の被印刷物表面に転写される。
この印刷版１を、非接触の計測装置の図示しない基台上に載置し、印刷版１の表面に対して垂直に光軸を有する光源３から照射された光が印刷版１表面で反射した光をカメラ４により検知する。光源３及びカメラ４の、ｘ方向の位置を固定するか、又はｘ方向に移動させて検知することができる。
その検知結果から一定のｚの値（凸部高さ）を有する印刷版１面の凸部２を求める。
Ｍは場合により設置しても良い鏡であって、照射された光や印刷版からの反射光を反射して、凸部２の側面も検知するために使用できるものである。
印刷版が曲面である場合、印刷版が円筒形の少なくとも一部を形成する形状であるときには、そのような印刷版を固定したシリンダー等の基板を、シリンダー軸を僅かに回転させる毎に、ｘ方向に表面の凸部を計測して、印刷版表面の二次元の情報を取得する。なお、このシリンダー表面に印刷版を固定する場合には、シリンダーの回転軸はｘ軸に平行となる。 FIG. 3 is a diagram showing a state in which the printing plate 1 of the plant pattern is inspected.
A convex portion 2 for printing a plant pattern is provided on the surface of the printing plate 1. At the time of printing, the ink composition adhering to the surface of the convex portion 2 is transferred to the surface of a printed matter such as paper.
The printing plate 1 is placed on a base (not shown) of a non-contact measuring device, and the light emitted from the light source 3 having an optical axis perpendicular to the surface of the printing plate 1 is reflected on the surface of the printing plate 1. The light is detected by the camera 4. The positions of the light source 3 and the camera 4 in the x direction can be fixed or moved in the x direction for detection.
From the detection result, the convex portion 2 of the printing plate 1 surface having a constant z value (convex portion height) is obtained.
M is a mirror that may be installed depending on the case, and can be used to reflect the irradiated light and the reflected light from the printing plate and to detect the side surface of the convex portion 2.
When the printing plate is a curved plate, when the printing plate has a shape forming at least a part of a cylinder, a substrate such as a cylinder to which such a printing plate is fixed is x. Two-dimensional information on the surface of the printing plate is acquired by measuring the convex portion of the surface in the direction. When the printing plate is fixed to the surface of the cylinder, the rotation axis of the cylinder is parallel to the x-axis.

図４は、検知結果からｚ値の求め方を示す図である。
印刷版１表面に対して光源３から光を照射し、印刷版１表面で反射された光をカメラ４にて検知する。凸部２表面に照射された照射部ａと、凸部２以外の印刷版表面に照射された照射部ｂがある。これらの照射部について、印刷版に対して垂直ではない方向、中でも光源３に対してｙ方向に移動した位置から、照射部ａとｂを斜め方向（角度θ）から検知することが好ましい。
このように検知すると、カメラ４からみて、照射部ａとｂは互いに異なる位置にあるものとして捉えられ、印刷版１表面に対するカメラ４の向きの角度を考慮することにより、凸部２の高さが一定値よりも高い場所を求めることができる。 FIG. 4 is a diagram showing how to obtain the z value from the detection result.
The surface of the printing plate 1 is irradiated with light from the light source 3, and the light reflected by the surface of the printing plate 1 is detected by the camera 4. There is an irradiation portion a that irradiates the surface of the convex portion 2 and an irradiation portion b that irradiates the surface of the printing plate other than the convex portion 2. With respect to these irradiation units, it is preferable to detect the irradiation units a and b from an oblique direction (angle θ) from a direction not perpendicular to the printing plate, particularly from a position moved in the y direction with respect to the light source 3.
When detected in this way, the irradiation portions a and b are regarded as being at different positions from the viewpoint of the camera 4, and the height of the convex portion 2 is increased by considering the angle of orientation of the camera 4 with respect to the surface of the printing plate 1. Can be found where is higher than a certain value.

図４において、光源３とカメラ４を一体化し、ｘ方向に移動可能とした場合を変形例として図５で示す。
例えば光源３からレーザー光を印刷版１に対して点状に照射する場合、印刷版の必要なｘ方向の範囲を対象にして検査するには、光源３を移動させる必要があり、同時にカメラ４も移動させる必要がある。図５は光源３とカメラ４を１つのベース５に設けることにより同時にｘ方向に移動させるものである。
そして印刷版１のｘ方向の必要な範囲のデータを得た後は、ベース５をｙ方向に移動させて、印刷版１上のデータを得た箇所に隣接する箇所を順次検査することによって、印刷版１の検査対象の全範囲を検査することができる。 In FIG. 4, a case where the light source 3 and the camera 4 are integrated and made movable in the x direction is shown in FIG. 5 as a modified example.
For example, when irradiating the printing plate 1 with laser light in a dot shape from the light source 3, it is necessary to move the light source 3 in order to inspect the required range of the printing plate in the x direction, and at the same time, the camera 4 Also need to be moved. FIG. 5 shows that the light source 3 and the camera 4 are provided on one base 5 and simultaneously moved in the x direction.
Then, after obtaining the data in the required range in the x direction of the printing plate 1, the base 5 is moved in the y direction, and the parts adjacent to the parts obtained with the data on the printing plate 1 are sequentially inspected. The entire range of the inspection target of the print plate 1 can be inspected.

Claims (2)

印刷版表面形状の検査装置であって、
凸部を有する印刷版表面の凸部を検知し、
得られた検知結果から、印刷版表面の一定高さの凸部の位置情報を得て、
その位置情報に基づき、一定高さ以上の凸部を有する印刷版表面の位置を幅方向に沿った一次元の情報である線分として得る処理装置１と、
計測装置を、印刷版表面の幅方向に対して垂直方向に相対的に移動させる移動装置と、
移動装置により、印刷版及び／又は計測装置を、印刷版表面の幅方向に対して垂直に移動する毎に計測して得た複数の線分を、計測装置が相対的に移動する方向に並べて、印刷版表面の該一定高さ以上の凸部の表面形状を二次元の情報として形成する処理装置２と、
該二次元の情報と、目的とする印刷パターンである二次元の情報を対比して、印刷版の凸部形状の適否を判断する判断装置を有する、印刷版表面形状の検査装置。 It is an inspection device for the surface shape of the printing plate.
Detects the convex part on the surface of the printing plate with the convex part,
From the obtained detection results, the position information of the convex portion of a certain height on the surface of the printing plate is obtained.
Based on the position information, the processing device 1 that obtains the position of the surface of the printing plate having a convex portion having a certain height or more as a line segment that is one-dimensional information along the width direction.
A moving device that moves the measuring device in the direction perpendicular to the width direction of the printing plate surface, and
A plurality of line segments obtained by measuring each time the printing plate and / or the measuring device is moved perpendicularly to the width direction of the printing plate surface by the moving device are arranged in the direction in which the measuring device moves relatively. , A processing device 2 that forms the surface shape of a convex portion having a certain height or more on the surface of the printing plate as two-dimensional information.
A printing plate surface shape inspection device having a determination device for determining the suitability of the convex shape of the printing plate by comparing the two-dimensional information with the two-dimensional information which is a target printing pattern. 印刷版表面形状の検査方法であって、
凸部を有する印刷版表面の凸部を検知し、
得られた検知結果から、印刷版表面の一定高さの凸部の位置情報を得て、
その位置情報に基づき、一定高さ以上の凸部を有する印刷版表面の位置を幅方向に沿った一次元の情報である線分として得る処理工程１と、
計測装置を、印刷版表面の幅方向に対して垂直方向に相対的に移動させる移動装置と、
移動装置により、印刷版及び／又は計測装置を、印刷版表面の幅方向に対して垂直に移動する毎に計測して得た複数の線分を、計測装置が相対的に移動する方向に並べて、印刷版表面の該一定高さ以上の凸部の表面形状を二次元の情報として形成する処理工程２と、
該二次元の情報と、目的とする印刷パターンである二次元の情報を対比して、印刷版の凸部形状の適否を判断する判断工程を有する、印刷版表面形状の検査方法。 This is a method for inspecting the surface shape of the printing plate.
Detects the convex part on the surface of the printing plate with the convex part,
From the obtained detection results, the position information of the convex portion of a certain height on the surface of the printing plate is obtained.
Based on the position information, the processing step 1 of obtaining the position of the surface of the printing plate having a convex portion having a certain height or more as a line segment which is one-dimensional information along the width direction.
A moving device that moves the measuring device in the direction perpendicular to the width direction of the printing plate surface, and
A plurality of line segments obtained by measuring each time the printing plate and / or the measuring device is moved perpendicularly to the width direction of the printing plate surface by the moving device are arranged in the direction in which the measuring device moves relatively. The processing step 2 of forming the surface shape of the convex portion having a certain height or more on the surface of the printing plate as two-dimensional information.
A method for inspecting the surface shape of a printing plate, which comprises a determination step of comparing the two-dimensional information with the two-dimensional information which is a target printing pattern to determine the suitability of the convex shape of the printing plate.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598086A (en) * 1982-07-07 1984-01-17 Hitachi Ltd Form detector
JPH11311509A (en) * 1998-04-27 1999-11-09 Hashimoto Denshi Kogyo Kk Impression inspecting device
JP2002287322A (en) * 2001-03-28 2002-10-03 Dainippon Screen Mfg Co Ltd Plate inspection method and plate inspection apparatus as well as plate making method
US20090157215A1 (en) * 2006-06-20 2009-06-18 Benecke-Kaliko Ag Method for Producing Three-Dimensionally Structured Surfaces
JP2010237298A (en) * 2009-03-30 2010-10-21 Fujifilm Corp Engraving monitoring method and device, plate making apparatus, and method for manufacturing printing plate
JP2015128822A (en) * 2013-12-31 2015-07-16 日本電子精機株式会社 Printing plate inspection method and device, and method using printing plate inspection method and device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598086A (en) * 1982-07-07 1984-01-17 Hitachi Ltd Form detector
JPH11311509A (en) * 1998-04-27 1999-11-09 Hashimoto Denshi Kogyo Kk Impression inspecting device
JP2002287322A (en) * 2001-03-28 2002-10-03 Dainippon Screen Mfg Co Ltd Plate inspection method and plate inspection apparatus as well as plate making method
US20090157215A1 (en) * 2006-06-20 2009-06-18 Benecke-Kaliko Ag Method for Producing Three-Dimensionally Structured Surfaces
JP2010237298A (en) * 2009-03-30 2010-10-21 Fujifilm Corp Engraving monitoring method and device, plate making apparatus, and method for manufacturing printing plate
JP2015128822A (en) * 2013-12-31 2015-07-16 日本電子精機株式会社 Printing plate inspection method and device, and method using printing plate inspection method and device

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