JPS6239380B2 - - Google Patents
Info
- Publication number
- JPS6239380B2 JPS6239380B2 JP54015314A JP1531479A JPS6239380B2 JP S6239380 B2 JPS6239380 B2 JP S6239380B2 JP 54015314 A JP54015314 A JP 54015314A JP 1531479 A JP1531479 A JP 1531479A JP S6239380 B2 JPS6239380 B2 JP S6239380B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- scanning beam
- mirror
- plywood board
- plywood
- 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
Links
- 239000011120 plywood Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000015067 sauces Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Description
【発明の詳細な説明】
〔技術分野〕
本発明はベニヤ板の色むらや傷を光学的に検査
する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for optically inspecting a plywood board for color unevenness and flaws.
従来のこの種の検査方法は、第１図に示すよう
に、コンベア１で移送されるベニヤ板２に斜め上
方より回転ミラー３によつて走査ビームを照射す
るものであつた。図において、４はガスレーザな
どのビーム投光器、５はフオトセルアレイなどの
受光器である。しかしこの従来方法にあつては、
第２図に示すように、被査体の中央部と側端部と
で走査ビームの入射角が異なるため、受光量に差
を生じ、特に正反射光を利用する傷の検出に支障
があつた。また第１図のように、ベニヤ板を定尺
切断した後に検査を行うと、欠陥が発見された際
に無駄が大きいので、定尺切断前に検査を行つて
欠陥部分のみを切断した方が歩留まりがよいので
あるが、第３図に示すように、ベニヤレースから
巻き取られたベニヤ板２をコンベアで連続移送す
るには、木材の繊維方向と直角に移送する必要が
あるために、走査ビームの入射方向が繊維の向き
と直交することになり、その結果第４図に示すよ
うに、ビームが導管溝６に入り込んで正反射光量
が減少し、欠陥検出のＳ／Ｎ比を低下させるとい
う欠点があつた。すなわち、導管溝は欠陥ではな
いので、それによる反射光量の変化はノイズ成分
となつて、傷などの欠陥の検出精度を低下させる
のである。
In the conventional inspection method of this kind, as shown in FIG. 1, a scanning beam is irradiated onto a plywood board 2 transported by a conveyor 1 from diagonally above using a rotating mirror 3. In the figure, 4 is a beam projector such as a gas laser, and 5 is a light receiver such as a photocell array. However, in this conventional method,
As shown in Figure 2, the angle of incidence of the scanning beam differs between the center and side edges of the object, resulting in a difference in the amount of light received, which particularly hinders the detection of flaws using specularly reflected light. Ta. Also, as shown in Figure 1, if you inspect the plywood after cutting it to a standard length, there will be a lot of waste if a defect is discovered, so it is better to inspect it before cutting it to a standard length and cut only the defective parts, which will increase the yield. However, as shown in Fig. 3, in order to continuously transport the plywood board 2 wound up from the veneer lace by a conveyor, it is necessary to transport it at right angles to the direction of the fibers of the wood. The incident direction is perpendicular to the direction of the fibers, and as a result, as shown in FIG. 4, the beam enters the conduit groove 6, reducing the amount of specularly reflected light and reducing the S/N ratio for defect detection. It was hot. That is, since the conduit groove is not a defect, a change in the amount of reflected light due to the conduit groove becomes a noise component and reduces the detection accuracy of defects such as scratches.
本発明は上記の問題点に鑑み為されたものであ
り、ベニヤ板の傷や色むらを光ビームで検査する
際に、導管溝が反射光量を変化させてＳ／Ｎ比を
低下させるという従来の欠点を解消することを目
的とするものである。
The present invention has been developed in view of the above-mentioned problems, and when inspecting plywood for scratches and color irregularities with a light beam, the conventional method in which the conduit groove changes the amount of reflected light and reduces the S/N ratio is a problem. The purpose is to eliminate shortcomings.
しかして本発明によるベニヤ板の検査方法は、
光ビームを放物面鏡の焦点位置に設けた回転ミラ
ーに照射して形成した水平な走査ビームを、コン
ベア移送方向に走査せしめると共に、該移送方向
と直角な方向に走行する細長形の斜面鏡により、
移送中のベニヤ板の表面に上記走査ビームを照射
せしめ、適宜の受光器によりベニヤ板からの反射
光あるいは透過光の光量の変化を検出せしめるも
のであり、走査ビームの入射方向が導管溝と平行
であるために、導管溝によつて反射光量が変化し
ない点に特徴を有するものである。
However, the method for inspecting a plywood board according to the present invention is as follows:
A horizontal scanning beam formed by irradiating a light beam onto a rotating mirror provided at the focal point of a parabolic mirror is scanned in the conveyor transport direction, and an elongated oblique mirror that travels in a direction perpendicular to the transport direction. According to
The scanning beam is irradiated onto the surface of the plywood board being transported, and a change in the amount of light reflected or transmitted from the plywood board is detected by an appropriate receiver, and the direction of incidence of the scanning beam is parallel to the conduit groove. Therefore, the feature is that the amount of reflected light does not change depending on the conduit groove.
第５図は本発明方法の実施例を示したもので、
ビーム投光器４から光ビームを放物面鏡７の焦点
位置に設けた回転ミラー３に照射して、水平面内
を平行移動する走査ビームＬを形成し、ベニヤ板
２の表面に近接して走行する細長形の斜面鏡８に
よつて、走査ビームＬをベニヤ板２の表面に照射
せしめ、適当な受光器５によりベニヤ板２からの
反射光あるいは透過光の光量の変化を検出せしめ
るものである。斜面鏡８はベニヤ板２の移送方向
（矢印ａ）と直角な方向（矢印ｂ）にスライドす
る可動枠９に取り付けられており、斜面鏡８の長
手方向がベニヤ板２の移送方向に一致している。
可動枠９は下方に開口したチヤネル状に形成され
て外来光を遮蔽するカバーを兼ねており、その側
板に走査ビームＬの入射するスリツト１０が設け
られ、天板の下面にフオトセルアレイよりなる受
光器５が取り付けられている。また天板の上面か
らは検出信号を欠陥判別装置に送るケーブル１１
が導出されている。
FIG. 5 shows an embodiment of the method of the present invention,
A light beam from the beam projector 4 is irradiated onto the rotating mirror 3 provided at the focal point of the parabolic mirror 7 to form a scanning beam L that moves in parallel in a horizontal plane, and a slender scanning beam L that travels close to the surface of the plywood board 2. A scanning beam L is irradiated onto the surface of the plywood board 2 by a shaped beveled mirror 8, and a change in the amount of reflected light or transmitted light from the plywood board 2 is detected by a suitable light receiver 5. The beveled mirror 8 is attached to a movable frame 9 that slides in a direction (arrow b) perpendicular to the direction of transport of the plywood board 2 (arrow a), and the longitudinal direction of the beveled mirror 8 corresponds to the direction of transport of the plywood board 2. .
The movable frame 9 is formed in the shape of a channel opening downward and also serves as a cover for shielding external light.A slit 10 through which the scanning beam L enters is provided on the side plate of the movable frame 9, and a light receiving device consisting of a photocell array is provided on the bottom surface of the top plate. A device 5 is attached. A cable 11 is also connected from the top of the top plate to send the detection signal to the defect identification device.
has been derived.
第６図の実施例は、受光器５を可動枠９に取り
付けずに固定式にしたもので、反射光用の受光器
５及び透過光用の受光器５′の受光面を半透明の
光散乱板１２で形成することにより、光電変換素
子１３への入射光量を走査ビームＬの照射位置に
関係なくほぼ一定になるようにし、それによつて
光電変換素子１３の所要個数を節減したものであ
る。 In the embodiment shown in FIG. 6, the light receiver 5 is fixed without being attached to the movable frame 9, and the light receiving surfaces of the light receiver 5 for reflected light and the light receiver 5' for transmitted light are translucent. By forming the scattering plate 12, the amount of light incident on the photoelectric conversion element 13 is made almost constant regardless of the irradiation position of the scanning beam L, thereby reducing the number of photoelectric conversion elements 13 required. .
上述のように本発明方法は、回転ミラーによつ
て放射状に投射された走査ビームを放物面鏡によ
り平行なビームに変えるものであるから、被査体
表面への入射角は常に一定に保たれ、従つて第２
図の従来例のように被査体の端部において受光レ
ベルが低下することがなく、またベニヤレースか
ら削出されたベニヤ板を連続移送しながら検査す
る際に、第５図に示したように、走査ビームのベ
ニヤ板への入射方向を導管溝の長手方向と一致さ
せることができ、従つて導管溝により反射光量が
変化して欠陥検出信号のＳ／Ｎ比を低下させると
いう従来方法の欠点を解消し得るものであり、ま
たそれにより、ベニヤ板を定尺切断する前に検査
することができるので、製品の歩留まりを向上し
得るという利点がある。
As mentioned above, in the method of the present invention, a scanning beam projected radially by a rotating mirror is converted into a parallel beam by a parabolic mirror, so the angle of incidence on the surface of the object to be scanned is always kept constant. Sauce, therefore the second
Unlike the conventional example shown in the figure, the received light level does not decrease at the end of the object to be inspected, and when inspecting the plywood board cut from the veneer lace while continuously transporting it, it is possible to , the direction of incidence of the scanning beam on the plywood board can be made to match the longitudinal direction of the conduit groove, which eliminates the drawback of the conventional method that the amount of reflected light changes due to the conduit groove, reducing the S/N ratio of the defect detection signal. This has the advantage of improving the yield of the product since the plywood board can be inspected before it is cut to length.
第１図は従来例の概略斜視図、第２図は第１図
におけるＡ―Ａ矢視図、第３図は同上の他の使用
例を示す概略斜視図、第４図は第３図のＡ―Ａ矢
視図、第５図は本発明の実施例を示す概略斜視
図、第６図は同上の他の実施例の要部断面図であ
る。
１…コンベア、２…ベニヤ板、３…回転ミラ
ー、４…ビーム投光器、５…受光器、６…導管
溝、７…放物面鏡、８…斜面鏡、９…可動枠、１
０…スリツト、１１…ケーブル、１２…光散乱
板、１３…光電変換素子、Ｌ…走査ビーム。
Fig. 1 is a schematic perspective view of a conventional example, Fig. 2 is a view taken along arrow A-A in Fig. 1, Fig. 3 is a schematic perspective view showing another usage example of the same as above, and Fig. 4 is the same as Fig. 3. FIG. 5 is a schematic perspective view showing an embodiment of the present invention, and FIG. 6 is a sectional view of a main part of another embodiment of the same. 1... Conveyor, 2... Plywood board, 3... Rotating mirror, 4... Beam projector, 5... Light receiver, 6... Conduit groove, 7... Parabolic mirror, 8... Slanted mirror, 9... Movable frame, 1
0...Slit, 11...Cable, 12...Light scattering plate, 13...Photoelectric conversion element, L...Scanning beam.
Claims (1)
ミラーに照射して形成した水平な走査ビームを、
コンベア移送方向に走査せしめると共に、該移送
方向と直角な方向に走行する細長形の斜面鏡によ
り、上記走査ビームを移送中のベニヤ板の表面に
照射せしめ、適宜の受光器によりベニヤ板からの
反射光あるいは透過光の光量の変化を検出せしめ
ることを特徴とするベニヤ板の検査方法。1 A horizontal scanning beam formed by irradiating a light beam onto a rotating mirror placed at the focal point of a parabolic mirror,
The scanning beam is scanned in the conveyor transport direction and is irradiated onto the surface of the plywood board being transported by an oblong mirror running in a direction perpendicular to the transport direction. A plywood inspection method characterized by detecting changes in the amount of transmitted light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1531479A JPS55107941A (en) | 1979-02-13 | 1979-02-13 | Inspecting method of sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1531479A JPS55107941A (en) | 1979-02-13 | 1979-02-13 | Inspecting method of sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55107941A JPS55107941A (en) | 1980-08-19 |
| JPS6239380B2 true JPS6239380B2 (en) | 1987-08-22 |
Family
ID=11885314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1531479A Granted JPS55107941A (en) | 1979-02-13 | 1979-02-13 | Inspecting method of sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55107941A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50151189A (en) * | 1974-05-24 | 1975-12-04 |
-
1979
- 1979-02-13 JP JP1531479A patent/JPS55107941A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50151189A (en) * | 1974-05-24 | 1975-12-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55107941A (en) | 1980-08-19 |
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