JPH04143639A - Illumination apparatus for optical inspection apparatus - Google Patents

Illumination apparatus for optical inspection apparatus

Info

Publication number
JPH04143639A
JPH04143639A JP2266486A JP26648690A JPH04143639A JP H04143639 A JPH04143639 A JP H04143639A JP 2266486 A JP2266486 A JP 2266486A JP 26648690 A JP26648690 A JP 26648690A JP H04143639 A JPH04143639 A JP H04143639A
Authority
JP
Japan
Prior art keywords
light
half mirror
medium
reflected
inspection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2266486A
Other languages
Japanese (ja)
Inventor
Shiyuukaato Dagurasu
ダグラス・シューカート
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP2266486A priority Critical patent/JPH04143639A/en
Publication of JPH04143639A publication Critical patent/JPH04143639A/en
Pending legal-status Critical Current

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  • Character Input (AREA)
  • Image Input (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

PURPOSE:To accurately discriminate the character/figure on the surface of an inspection medium subjected to mirror surface finishing by mounting the half mirror provided on the light path between the inspection medium and an imaging means a predetermined angle and a light source emitting uniform irregular light to the half mirror. CONSTITUTION:The parallel light emitted from an illumination apparatus 3 constituted of long fluorescent lamps 31 - 36 is irregularly reflected by a white screen 4 and uniform irregular light is reflected to a half mirror 5 which is turn reflects the reflected light to a lower inspection medium 2 and permits the reflected light from the medium 2 and the character printed on the medium to transmit toward upper lenses 7, 8. This reflected light enters cameras 11, 12 to be processed by an image processor. The irregular reflected light transmitted through the mirror 5 from the screen 4 is absorbed by a black screen 6 and the invasion of external light is prevented by said screen 6. By this method, the character printed on the surface of the medium 2 can be accurately discriminated.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はコンパクトディスク(CD)などの鏡面仕上げ
された検査媒体に記された文字5図形などを検査する光
学検査装置に用いる照明装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an illumination device used in an optical inspection device for inspecting characters, figures, etc. written on a mirror-finished inspection medium such as a compact disc (CD).

〔従来の技術2および 発明が解決しようとする課題〕 CDには記録内容などを表示するためその表面にメーカ
ー名2曲名、演奏者名などを印刷したラヘルが貼付され
ている。このような印刷文字2図形などを出荷前に自動
的に検査することが望まれている。
[Prior Art 2 and Problems to be Solved by the Invention] A label on which the manufacturer's name, two song titles, and the performer's name are printed is pasted on the surface of the CD to display the recorded contents. It is desired to automatically inspect such printed characters, figures, etc. before shipping.

CDの印刷文字1図形などの自動検査を行う場合、CD
の表面は通常、アルミ蒸着により鏡面仕上げされている
ため鏡に対して照明すると同様の条件で印刷文字などを
識別することになるので照明が難しい。
When performing automatic inspection of printed characters, figures, etc. on CDs,
The surface of the mirror is usually mirror-finished by vapor deposition of aluminum, so illumination is difficult because if you illuminate the mirror, you will be able to identify printed characters under the same conditions.

従来、CD面の印刷文字を検査するための照明方法の1
つとしては9種々の蛍光灯、たとえば。
Conventionally, one of the illumination methods for inspecting printed characters on the CD surface
For example, there are 9 types of fluorescent lamps.

丸い形の蛍光灯、真っ直ぐの形の蛍光灯などを適宜配設
して一様平面光を作りCD面を直接照明する方法がある
There is a method of creating uniform plane light by arranging round fluorescent lamps, straight fluorescent lamps, etc. as appropriate to directly illuminate the CD surface.

この直接照明方法は、しかしながら、照明光がCD面で
全反射し、蛍光灯をどのように配設してもCD面の明る
さが一様にならないという問題がある。その結果、CD
面のある部分は蛍光灯の光がCD面から直接反射してそ
の反射光がカメラに入射されるため明るくなりすぎ、ま
た場合によっては影がでる。影の発生には2つの原因が
考えられる。第1の原因は蛍光灯の暗い部分が影を作る
ことである。第2の原因は蛍光灯からの光線が大きな入
射角(水平面に対して低い面からのCDへの入射角)で
CD面に入射することによる。CD面から全反射した照
明光を欠陥として誤判断する可能性が高い。そして、影
の存在が本当の印刷文字などの欠陥を覆い隠すという問
題もある。
However, this direct illumination method has a problem in that the illumination light is totally reflected on the CD surface and the brightness of the CD surface is not uniform no matter how the fluorescent lamps are arranged. As a result, CD
Some parts of the surface become too bright because the light from the fluorescent lamp is directly reflected from the CD surface and the reflected light enters the camera, and in some cases shadows may appear. There are two possible causes for the occurrence of shadows. The first cause is that the dark areas of fluorescent lights create shadows. The second cause is that the light rays from the fluorescent lamp are incident on the CD surface at a large angle of incidence (angle of incidence on the CD from a surface lower than the horizontal plane). There is a high possibility that illumination light totally reflected from the CD surface will be mistakenly judged as a defect. There is also the problem that the presence of shadows masks defects such as real printed characters.

また、従来、CD面の映像をスクリーンに投影する方法
が知られている。この方法によれば、影、全反射照明光
がないCD面の画像を得ることができる。しかしながら
、この方法においては、細かい部分の画像を鮮明に見る
ことができず、小さな印刷文字などの欠陥を検出できな
いという問題に遭遇する。
Furthermore, a method of projecting an image on a CD onto a screen is conventionally known. According to this method, it is possible to obtain an image of the CD surface without shadows or totally internally reflected illumination light. However, this method encounters the problem that it is not possible to clearly see images of fine parts, and defects such as small printed characters cannot be detected.

CD面印刷文字の自動検査においてはさらに外部からの
映像がCD面に反射するという問題に遭遇している。鏡
面仕上げされたCD面は鏡と同様であるから、CD面の
真上に何かが存在するとその真上にある物、たとえば撮
像用のカメラの映像がCD面からカメラに反射する。す
なわち、CD面の上部に設置されたカメラの映像もCD
面で反射されてしまい検査用の画像を撮影するカメラ自
身が検査誤りの原因となる。
In automatic inspection of characters printed on the CD surface, a further problem has been encountered in that external images are reflected on the CD surface. A mirror-finished CD surface is similar to a mirror, so if something is present directly above the CD surface, the object directly above it, such as an image from an imaging camera, will be reflected from the CD surface to the camera. In other words, the image from the camera installed above the CD surface is also
The camera itself that takes images for inspection may be the cause of inspection errors as it is reflected by surfaces.

このような反射は2反射しない黒い生地または黒い囲い
でカメラを包囲することによっである程度減少させるこ
とができるが、完全に無くすことはできず、依然として
周囲からの反射の問題を回避できない。
Although such reflections can be reduced to some extent by surrounding the camera with non-reflective black fabric or a black enclosure, it cannot be completely eliminated and the problem of reflections from the surroundings cannot be avoided.

以上、CD面の印刷文字1図形などの自動検査における
問題について述べたが、上記問題はCDに限らず、CD
同様に鏡面仕上げされた検査媒体に付された文字1図形
などを自動検査する場合も同様に問題となっている。
Above, we have discussed the problems in automatic inspection of printed characters, figures, etc. on the CD surface, but the above problems are not limited to CDs.
Similarly, a similar problem arises when automatically inspecting characters, figures, etc. attached to a mirror-finished inspection medium.

したがって9本発明は、鏡面仕上げされた検査媒体面の
文字9図形などを正確に識別可能な照明装置を提供する
ことを目的とする。
Therefore, it is an object of the present invention to provide an illumination device that can accurately identify characters and figures on the surface of a mirror-finished inspection medium.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は上記問題を解決するため、光学検査装置の照明
装置を、検査媒体と撮像手段との間の光路上に所定の角
度を保って設けられたハーフミラおよび、該ハーフミラ
−に一様乱光線を放射する光源手段を具備する構成とす
る。
In order to solve the above problems, the present invention provides an illumination device for an optical inspection device including a half mirror provided at a predetermined angle on the optical path between the inspection medium and the imaging means, and a uniformly scattered light beam directed to the half mirror. The structure includes a light source means for emitting .

好適には、乱光線放射光源を2面光線を発する光源と該
光源からの光を乱反射させ該反射光をハーフミラ−に投
射する反射板で構成する。
Preferably, the diffused light emitting light source is constituted by a light source that emits bifacial light and a reflecting plate that diffusely reflects the light from the light source and projects the reflected light onto a half mirror.

さらに好適には、ハーフミラ−を挟んで反射板と対向す
る位置に光遮蔽板を備える。
More preferably, a light shielding plate is provided at a position facing the reflecting plate with the half mirror in between.

〔作用〕[Effect]

平面的法がりを持つ一様乱光線を放射する光源手段から
の光がハーフミラ−に投射されその反射光が該検査媒体
に投射され、検査媒体からの反射光がハーフミラ−を介
してその上部に配設されたカメラなどを含む撮像手段に
入射される。
Light from a light source that emits a uniformly scattered light beam with a planar slope is projected onto a half mirror, and its reflected light is projected onto the inspection medium, and the reflected light from the inspection medium passes through the half mirror onto the top of the inspection medium. The light is incident on an imaging means including a camera and the like provided therein.

平面的法がりを持つ乱光線をハーフミラ−を介して、C
Dなどの検査媒体に投射させるので。
Scattered rays with a planar slope are passed through a half mirror to C
Because it is projected onto a test medium such as D.

様な光線が検査媒体に投射され、影が発生しない。また
、ハーフミラ−を用いることにより、その上部に配設さ
れた撮像手段自体が検査媒体面で反射されて検査誤りを
惹起させることがない。
A similar beam of light is projected onto the test medium and no shadows are created. Further, by using a half mirror, the imaging means itself disposed above the half mirror is not reflected on the surface of the inspection medium, thereby preventing inspection errors from occurring.

さらに、光遮蔽板を配設することにより2周囲の映像が
検査領域に入り込むことがない。
Furthermore, by providing a light shielding plate, two surrounding images will not enter the inspection area.

〔実施例〕〔Example〕

図面に本発明の光学検査装置用照明装置の1実施例とし
て、検査媒体として印刷文字2図形が付されたCDを自
動検査する装置に用いられる照明装置の断面を示す。
The drawings show a cross section of an illumination device used in an apparatus for automatically inspecting a CD with two printed characters as an inspection medium, as an embodiment of the illumination device for an optical inspection device according to the present invention.

図面に示す照明装置は、CD2を載置する検査台1.蛍
光照明装置3.ホワイトスクリーン4ハーフミラ−5,
ブランクスクリーン6からなる検査媒体であるCD2に
は印刷文字1図形など(以下1印刷文字と略す)が付さ
れている。CD2およびハーフミラ−5の上方には、撮
像手段としてのカメラ支持板10に固定されたレンズ7
8およびカメラ11.12が配設されている。
The illumination device shown in the drawing includes an inspection table 1 on which the CD2 is placed. Fluorescent lighting device 3. White screen 4 half mirror 5,
A CD 2, which is an inspection medium made of a blank screen 6, has a printed character 1 figure (hereinafter abbreviated as 1 printed character) attached thereto. Above the CD 2 and the half mirror 5, a lens 7 is fixed to a camera support plate 10 as an imaging means.
8 and cameras 11.12 are arranged.

検査台1はハーフミラ−5からの光線を反射しないよう
に無反射部材、たとえば、黒い布で覆われている。蛍光
照明装置3は図面に垂直に配設された長尺の6本の蛍光
灯31〜36で構成され平面平行光線をホワイトスクリ
ーン4に向けて放射する。ホワイトスクリーン4は乱反
射面を有しており、蛍光照明装置3からの平面平行光線
を乱反射して一様乱光線をハーフミラ−5に向けて反射
する。
The examination table 1 is covered with a non-reflective material, for example, black cloth, so as not to reflect the light from the half mirror 5. The fluorescent lighting device 3 is composed of six long fluorescent lamps 31 to 36 arranged perpendicular to the drawing, and emits plane parallel light beams toward the white screen 4. The white screen 4 has a diffused reflection surface, and diffuses the plane parallel light rays from the fluorescent lighting device 3 and reflects the uniformly diffused light rays toward the half mirror 5.

CD2とカメラ11.12との間に形成される光路の間
に配設されたハーフミラ−5は、ホワイトスクリーン4
からの乱光線を、下方のCD2に向けて反射する。また
、ハーフミラ−5はCD2およびCD2に付された印刷
文字からの反射光を上方のレンズ7.8に向けて透過さ
せる。
A half mirror 5 disposed between the optical path formed between the CD 2 and the camera 11.12 is a white screen 4.
Scattered light rays are reflected downward toward CD2. Further, the half mirror 5 transmits reflected light from the CD 2 and the printed characters attached to the CD 2 toward an upper lens 7.8.

ここで7ハーフミラー5は光路と角度θ1好適には14
5°の角度を保って配設され、さらにホワイトスクリー
ン4はハーフミラ−5に対して角度α、好適には90°
保って配設されている。
Here, the 7 half mirror 5 has an optical path and an angle θ1 preferably 14
The white screen 4 is arranged at an angle of 5 degrees, and the white screen 4 is also arranged at an angle α, preferably 90 degrees, with respect to the half mirror 5.
It is maintained and arranged.

ハーフミラ−5を透過したCD2からの反射光はレンズ
7.8を介してカメラ11.12!こ映像として読み取
られる。カメラ11.12は好適には CCDカメラで
ある。カメラ11.12の後段には画像処理装置(図示
せず)が設けられている。
The reflected light from the CD 2 that has passed through the half mirror 5 is transmitted through the lens 7.8 to the camera 11.12! This can be read as an image. Cameras 11.12 are preferably CCD cameras. An image processing device (not shown) is provided downstream of the camera 11.12.

レンズ7.8およびカメラ11.12は図面においては
2個として示しているが、実際はそれぞれ4個設けられ
ており、各々がCD2を4分割した映像として検出する
ように配設されている。勿論、4個のカメラ11.12
はそれぞれ部分的に重複したCD2の映像を読み取る。
Although two lenses 7.8 and cameras 11.12 are shown in the drawing, in reality four of each are provided, and each is arranged so as to detect an image obtained by dividing the CD 2 into four. Of course, 4 cameras11.12
read the partially overlapping images of CD2.

また、ハーフミラ−5を挟んで、ホワイトスクリーン4
と対向する位置にブラックスクリーン6が設けられてい
る。ブラックスクリーン6は黒い膜で形成されており、
ホワイトスクリーン4からのハーフミラ−5を透過した
乱反射光を吸収すると同時に外部からの光線をこの装置
内に入り込まないようにしている。
In addition, with the half mirror 5 in between, the white screen 4
A black screen 6 is provided at a position facing the. The black screen 6 is formed of a black film,
It absorbs the diffusely reflected light transmitted through the half mirror 5 from the white screen 4, and at the same time prevents external light from entering the device.

なお1図示していないが、蛍光照明装置3.ハーフミラ
−5およびブランクスクリーン6から検査台1の面まで
の照明空間は、黒い布で包囲されており、外部の光がこ
の照明装置内に入り込まないようにしている。
Note that 1. Although not shown, a fluorescent lighting device 3. The illumination space from the half mirror 5 and the blank screen 6 to the surface of the examination table 1 is surrounded by black cloth to prevent outside light from entering the illumination device.

以、上に述べた構成によれば、まず、この照明装置内に
は外部光線が入り込まない。また、乱光線放射手段を構
成する蛍光照明装置3およびホワイトスクリーン4から
の光線は、ハーフミラ−5を介して一様にCD2面に投
射されるので、CD2面に影が発生しない。したがって
、影の影響を受けない。さらに、上述したように、ハー
フミラ−5の配役により、レンズ7.8およびカメラ1
112の影響が排除されている。
According to the configuration described above, first, no external light rays enter the lighting device. Further, since the light beams from the fluorescent illumination device 3 and the white screen 4 constituting the scattering light emitting means are uniformly projected onto the CD 2 surface via the half mirror 5, no shadow is generated on the CD 2 surface. Therefore, it is not affected by shadows. Furthermore, as mentioned above, due to the casting of the half mirror 5, the lens 7.8 and the camera 1
112 influence has been eliminated.

以上述べたように、この照明装置によれば、従来問題と
なっている種々の問題が解決されている。したがって、
この照明装置を用いて検査媒体の文字2図形などをカメ
ラ11.12を介して画像処理装置(図示せず)におい
て正確に識別することができる。
As described above, this lighting device solves various conventional problems. therefore,
Using this illumination device, letters, figures, etc. on the inspection medium can be accurately identified in an image processing device (not shown) via the camera 11, 12.

以上、CD2に付された文字9図形を自動検査する例に
ついて例示したが2本発明はCD面の検査に限らず、他
の種々の同様な検査媒体の自動検査に用いることができ
る。
Although the example of automatically inspecting nine characters and figures attached to a CD 2 has been described above, the present invention is not limited to inspecting a CD surface, but can be used for automatically inspecting various other similar inspection media.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明の照明装置によれば外部光線の
影響を受けず、また、影が発生しないから正確な文字7
図形などの自動検査を行うことが可能となる。
As described above, the illumination device of the present invention is not affected by external light and does not generate shadows, so it is possible to accurately
It becomes possible to perform automatic inspection of figures, etc.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明の光学検査装置用照明装置の1実施例を示
す断面構成図である。 (符号の説明) 1・・・検査台 2・・・CD。 3・・・蛍光照明装置 4・・・ホワイトスクリーン 5・・・ハーフミラー 6・・・ブラックスクリーン 78・・・レンズ 10・・・カメラ支持板 11.12・・・カメラ。 31〜36・・・蛍光灯。
The drawing is a cross-sectional configuration diagram showing one embodiment of the illumination device for optical inspection equipment of the present invention. (Explanation of symbols) 1... Examination table 2... CD. 3...Fluorescent lighting device 4...White screen 5...Half mirror 6...Black screen 78...Lens 10...Camera support plate 11.12...Camera. 31-36...Fluorescent lights.

Claims (1)

【特許請求の範囲】 1、検査媒体と撮像手段との間の光路上に所定の角度を
保って設けられたハーフミラー、および、該ハーフミラ
ーに一様乱光線を放射する光源手段を具備し、該光源手
段からの光が該ハーフミラーに投射されその反射光が該
検査媒体に投射され、該検査媒体からの反射光が該ハー
フミラーを介して該撮像手段に入射されるように構成し
たことを特徴とする光学検査装置の照明装置。 2、該乱光線放射光源が、面光線を発する光源と該光源
からの光を乱反射させ該反射光を該ハーフミラーに投射
する反射板からなる請求項1記載の光学検査装置の照明
装置。 3、該ハーフミラーを挟んで該反射板と対向する位置に
光遮蔽板を備えた請求項2記載の光学検査装置の照明装
置。
[Claims] 1. A half mirror provided at a predetermined angle on the optical path between the inspection medium and the imaging means, and a light source means for emitting uniformly scattered light rays to the half mirror. , the light from the light source means is projected onto the half mirror, the reflected light thereof is projected onto the inspection medium, and the reflected light from the inspection medium is incident on the imaging means via the half mirror. An illumination device for an optical inspection device, characterized in that: 2. The illumination device for an optical inspection apparatus according to claim 1, wherein the diffused light emitting light source comprises a light source that emits a surface light beam and a reflector that diffusely reflects the light from the light source and projects the reflected light onto the half mirror. 3. The illumination device for an optical inspection apparatus according to claim 2, further comprising a light shielding plate at a position facing the reflecting plate with the half mirror in between.
JP2266486A 1990-10-05 1990-10-05 Illumination apparatus for optical inspection apparatus Pending JPH04143639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2266486A JPH04143639A (en) 1990-10-05 1990-10-05 Illumination apparatus for optical inspection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2266486A JPH04143639A (en) 1990-10-05 1990-10-05 Illumination apparatus for optical inspection apparatus

Publications (1)

Publication Number Publication Date
JPH04143639A true JPH04143639A (en) 1992-05-18

Family

ID=17431606

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2266486A Pending JPH04143639A (en) 1990-10-05 1990-10-05 Illumination apparatus for optical inspection apparatus

Country Status (1)

Country Link
JP (1) JPH04143639A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06229927A (en) * 1993-02-03 1994-08-19 Nireco Corp Reflector for inspection
US5956080A (en) * 1996-04-25 1999-09-21 Sanyo Electric Co., Ltd. Printing face inspecting apparatus
WO2018034051A1 (en) * 2016-08-18 2018-02-22 株式会社Screenホールディングス Inspection apparatus and inspection method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06229927A (en) * 1993-02-03 1994-08-19 Nireco Corp Reflector for inspection
US5956080A (en) * 1996-04-25 1999-09-21 Sanyo Electric Co., Ltd. Printing face inspecting apparatus
WO2018034051A1 (en) * 2016-08-18 2018-02-22 株式会社Screenホールディングス Inspection apparatus and inspection method
JP2018028476A (en) * 2016-08-18 2018-02-22 株式会社Screenホールディングス Inspection device and inspection method
US10942131B2 (en) 2016-08-18 2021-03-09 SCREEN Holdings Co., Ltd. Inspection apparatus and inspection method

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