JPH0827239B2 - Lighting equipment - Google Patents
Lighting equipmentInfo
- Publication number
- JPH0827239B2 JPH0827239B2 JP61269568A JP26956886A JPH0827239B2 JP H0827239 B2 JPH0827239 B2 JP H0827239B2 JP 61269568 A JP61269568 A JP 61269568A JP 26956886 A JP26956886 A JP 26956886A JP H0827239 B2 JPH0827239 B2 JP H0827239B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- illumination
- light receiving
- emission amount
- illumination body
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 《産業上の利用分野》 本発明は、実装基板検査装置等において用いられる照
明装置に関する。TECHNICAL FIELD The present invention relates to a lighting device used in a mounting board inspection device or the like.
《従来の技術》 プリント基板（実装基板）上に部品が正しくマウント
されているかどうかを検査する実装基板検査装置などの
ように、TVカメラによって被写体を撮像し、これによっ
て得られた画像を処理して被写体の状態を検査するもの
においては、照明装置などによって被写体の明るさを一
定にする必要がある。<Prior art> Like a mounting board inspection device that inspects whether a component is mounted correctly on a printed circuit board (mounting board), a TV camera captures the subject and processes the resulting image. In the case of inspecting the condition of a subject by using an illumination device or the like, it is necessary to make the brightness of the subject constant.
第３図はこのような照明装置の一例を示す断面図であ
る。FIG. 3 is a sectional view showing an example of such a lighting device.
この図に示す装置は、TVカメラ１の下部側に配置され
るシェード２と、このシェード２内に設けられるランプ
３とを備えており、ランプ３を点灯して得られる光によ
って被写体（被検査対象物）４を照明する。The apparatus shown in this figure includes a shade 2 arranged on the lower side of the TV camera 1 and a lamp 3 provided in the shade 2, and an object (inspected Object) 4 is illuminated.
《発明が解決しようとする問題点》 ところでこのよう照明装置において用いられるランプ
３は、第４図に示すように、周囲温度が変化したり、点
灯総時間が長くなったりしたときに、ランプ輝度が変わ
ってしまう。このため、実装基板検査装置などのよう
に、TVカメラ１によって得られた被写体の画像の明度レ
ベルまで判定するものにおいては、画像処理装置（図示
略）側で被写体４の画像を処理できなくなってしまうこ
とがある。<< Problems to be Solved by the Invention >> By the way, as shown in FIG. 4, the lamp 3 used in such a lighting device has a lamp brightness when the ambient temperature changes or the total lighting time becomes long. Will change. Therefore, in a device such as a mounting board inspection device that determines the brightness level of the image of the subject obtained by the TV camera 1, the image processing device (not shown) cannot process the image of the subject 4. It may end up.
そこで、第５図に示す如くTVカメラ１の下方に照度セ
ンサ５を設けてランプ３の明るさを測定し、この測定結
果に基づいてランプ３の輝度をコントロールすることも
考えられるが、このような方法では照度センサ５の受光
面にゴミやホコリが溜り易く、これらゴミ等によって照
度センサ５の受光量が落ちて測定誤差が生じ易い。Therefore, as shown in FIG. 5, an illuminance sensor 5 may be provided below the TV camera 1 to measure the brightness of the lamp 3, and the brightness of the lamp 3 may be controlled based on the measurement result. In such a method, dust or dust is likely to be accumulated on the light receiving surface of the illuminance sensor 5, and the amount of light received by the illuminance sensor 5 is reduced by the dust or the like, and a measurement error is likely to occur.
そこでこのような不都合を除くために、第６図に示す
如くシェード２の内面に照度センサ５を設けることも考
えられるが、このような方法では、ランプ３からの直接
光だけでなく、被写体４からの反射光も照度センサ５に
入射するので、被写体の色（反射率）が変わると、測定
値自体も変動してしまう。Therefore, in order to eliminate such inconvenience, it is conceivable to provide an illuminance sensor 5 on the inner surface of the shade 2 as shown in FIG. 6, but in such a method, not only the direct light from the lamp 3 but also the subject 4 Since the reflected light from the light also enters the illuminance sensor 5, if the color (reflectance) of the subject changes, the measured value itself also changes.
また、このように、TVカメラ１の下方や、ランプ３の
側面に照度センサ５を配置する方法では、ランプ３を多
灯化したとき、各ランプ３の明るさを個々に、測定する
ことができないので、各ランプ３を個別に制御すること
ができないという問題がある。Further, in this way, in the method of disposing the illuminance sensor 5 below the TV camera 1 or on the side surface of the lamp 3, when the number of lamps 3 is increased, the brightness of each lamp 3 can be individually measured. Therefore, there is a problem that each lamp 3 cannot be controlled individually.
本発明は上記の問題点に鑑みてなされたものであっ
て、その目的とするところは、照明光量を制御するのに
不具合がないように照射光量の受光部を出射範囲及び撮
像範囲を遮らない位置に配設して、被検査対象物からの
反射光を撮像して検査する際に影響がないようにすると
共に、フォトセンサの温度特性変化による受光信号の変
動をなくして、照明体の発光量が誤差の少ない制御を可
能とし、且つ照明体の交換時期を作業者に明示するよう
にした照明装置を提供するものである。The present invention has been made in view of the above problems, and an object of the present invention is not to block the emission range and the imaging range of the light receiving unit for the irradiation light amount so that there is no problem in controlling the illumination light amount. It is arranged at a position so that it does not affect the inspection when the reflected light from the inspection object is imaged, and the fluctuation of the received light signal due to the temperature characteristic change of the photo sensor is eliminated, and the illumination body emits light. (EN) Provided is a lighting device which enables control with a small amount of error and which makes it possible to clearly indicate to a worker the replacement timing of a lighting body.
《問題点を解決するための手段》 上記の目的を達成するために、本発明の照明装置は、
第１に、被検査対象物に光を照射する照明体と、受光部
と、この受光部によって得られた前記照明体の明るさに
基づいて前記照明体の発光量を制御する制御部と、被検
査対象物に照明光を照射してその反射光を撮像する撮像
部とを備えた照明装置において、前記受光部が、受光面
が前記照明体と対向するように配置されたフォトセンサ
と、前記照明体の表面から発せられた光のみを前記フォ
トセンサの受光面に集光させる光学系と、前記光学系に
入射する光から赤外線領域を除去する赤外線遮光手段と
を備え、前記受光部を、前記照明体から前記被検査対象
物に出射する出射光を遮らず且つ前記被検査対象物を撮
像する前記撮像部の撮像視野を遮らない位置に配置して
構成している。<< Means for Solving the Problems >> In order to achieve the above object, the lighting device of the present invention comprises:
First, an illumination body that irradiates an object to be inspected with light, a light receiving section, and a control section that controls the light emission amount of the illumination body based on the brightness of the illumination body obtained by the light receiving section, In an illumination device including an imaging unit that illuminates an object to be inspected with illumination light and images the reflected light thereof, the light receiving unit has a photosensor arranged such that a light receiving surface faces the illumination body, An optical system for condensing only the light emitted from the surface of the illuminating body on the light receiving surface of the photosensor, and an infrared light shielding means for removing an infrared region from the light incident on the optical system are provided, and the light receiving unit is provided. The light is emitted from the illuminating body to the object to be inspected, and the imaging field of view of the imaging unit for imaging the object to be inspected is not obstructed.
第２に、本発明の照明装置は、被検査対象物に光を照
射する照明と、受光部と、この受光部によって得られた
前記照明体の明るさに基づいて前記照明体の発光量を制
御する制御部と、被検査対象物に照明光を照射してその
反射光を撮像する撮像部とを備えた照明装置において、
前記受光部が、受光面が前記照明体と対向するように配
置されたフォトセンサと、前記照明体の表面から発せら
れた光のみを前記フォトセンサの受光面に集光させる光
学系とを備え、前記受光部を、前記照明体から前記被検
査対象物に出射する出射光を遮らず且つ前記被検査対象
物を撮像する前記撮像部の撮像視野を遮らない位置に配
置し、且つ、前記制御部が前記照明体の発光量を所定の
発光量に制御すると共に所定の発光量に制御できなくな
ったときに警報を報知する報知手段を備えて構成してい
る。Secondly, the illumination device of the present invention determines the amount of light emitted from the illumination body based on the illumination for irradiating the object to be inspected with light, the light receiving section, and the brightness of the illumination body obtained by the light receiving section. In a lighting device including a control unit for controlling and an imaging unit for illuminating an object to be inspected with illumination light and imaging the reflected light,
The light receiving unit includes a photo sensor arranged such that a light receiving surface faces the illuminating body, and an optical system for condensing only light emitted from the surface of the illuminating body on the light receiving surface of the photo sensor. Arranging the light receiving unit at a position that does not block the emitted light emitted from the illumination body to the inspection target and does not block the imaging field of view of the imaging unit that images the inspection target, and The unit is configured to include a notification unit that controls the light emission amount of the illuminating body to a predetermined light emission amount and issues an alarm when the light emission amount cannot be controlled to the predetermined light emission amount.
《作用》 かかる構成により、照明装置の照明光量を制御するの
に不具合がないように照明光量の受光部を出射範囲及び
撮像範囲を遮らない位置に配置されるので、被検査対象
物からの反射光を撮像して検査する際に影響を及ぼさな
い。<< Operation >> With such a configuration, the light receiving unit for the illumination light amount is arranged in a position that does not block the emission range and the imaging range so that there is no problem in controlling the illumination light amount of the illumination device, and thus the reflection from the inspection object is performed. It has no effect when imaging and inspecting light.
また、第１の発明においては、光学系に入射する光か
ら赤外線領域を除去する赤外線遮光手段を備えている結
果、受光部内の温度上昇を抑え、フォトセンサの温度特
性変化による受光信号の変動をなくして、照明体の発光
量が誤差の少ない制御を可能とする。Further, in the first aspect of the invention, as a result of including the infrared ray shielding means for removing the infrared ray region from the light incident on the optical system, the temperature rise in the light receiving portion is suppressed, and the fluctuation of the light receiving signal due to the temperature characteristic change of the photo sensor is suppressed. Without this, it is possible to control the light emission amount of the illumination body with a small error.
更に、第２の発明においては、制御部は、照明体の発
光量を所定の発光量に制御できなくなったときに警報を
報知する報知手段を備えているために、この警報によっ
て照明体の交換時期が作業者に明示され、タイミング良
く交換することによって、最適な条件の下に、被検査対
象物を撮像して、画像処理装置側の画像処理を常に正確
なものとする。Further, in the second aspect of the invention, since the control unit is provided with the notification means for issuing an alarm when the light emission amount of the illumination body cannot be controlled to the predetermined light emission amount, the illumination body is replaced by this alarm. The time is clearly indicated to the operator, and by exchanging at the right time, the object to be inspected is imaged under the optimum conditions, and the image processing on the image processing apparatus side is always accurate.
《実施例》 第１図は本発明による照明装置の一実施例を示す概略
構成図である。<< Embodiment >> FIG. 1 is a schematic configuration diagram showing an embodiment of a lighting device according to the present invention.
この図に示す照明装置10は実装基板検査装置９に組み
込んで使用されるものであり、撮像部であるTVカメラ11
の下部に設けられるカップ状のシェード12と、このシェ
ード12内に配置される照明体であるランプ13と、前記シ
ェード12の側面に形成された透孔23部分に取り付けられ
る受光部14と、この受光部14の出力に基づいて前記ラン
プ13の明るさを制御する制御部15とを備えている。The illumination device 10 shown in this figure is used by incorporating it in the mounting board inspection device 9, and is a TV camera 11 which is an imaging unit.
A cup-shaped shade 12 provided at the bottom of the shade 12, a lamp 13 as an illuminating body arranged in the shade 12, a light receiving portion 14 attached to a through hole 23 portion formed on the side surface of the shade 12, and a The control unit 15 controls the brightness of the lamp 13 based on the output of the light receiving unit 14.
この場合、受光部14は第２図に示す如く前記シェード
12の側部外面に取り付けられる通気孔付きのセンサハウ
ジング16と、受光面が前記ランプ13と対向するような向
きで前記センサハウジング16内に配置されるフォトセン
サ17と、ランプ13の表面から発せられた光のみを前記フ
ォトセンサ17の受光面に集光させる光学系であるレンズ
18と、このレンズ18に入射する光から赤外光を除去して
前記フォトセンサ17の温度が上がらないようにする赤外
線遮光手段である赤外線カットフィルタ19とを備えてお
り、前記ランプ13が点灯したとき、フォトセンサ17がこ
れを検知して前記ランプ13の表面から発せられる光の量
に応じた値の電気信号（光量検知信号）を発生し、これ
を制御部15に供給する。In this case, the light receiving portion 14 is arranged in the shade as shown in FIG.
A sensor housing 16 with a ventilation hole attached to the outer surface of the side of 12, a photo sensor 17 arranged in the sensor housing 16 with the light receiving surface facing the lamp 13, and a light emitted from the surface of the lamp 13. A lens that is an optical system that focuses only the received light on the light receiving surface of the photosensor 17.
18 and an infrared cut filter 19 which is an infrared light shielding means for removing infrared light from the light incident on the lens 18 to prevent the temperature of the photosensor 17 from rising, and the lamp 13 is turned on. At this time, the photo sensor 17 detects this and generates an electric signal (light amount detection signal) having a value corresponding to the amount of light emitted from the surface of the lamp 13, and supplies this to the control unit 15.
制御部15は、前記光量検知信号の値と、光量設定器20
によって設定された値とを比較してその差を算出すると
ともに、この差を増幅して出力するアンプ21と、このア
ンプ21から出力される差信号の値に応じて前記ランプ13
の明るさを制御するとともに、ランプ13の管電流がラン
プ寿命による発光効率低下により増大し、予め決められ
た管電流値を越えたときにランプ13が劣化したことを示
すランプ異常信号を発生する照明電源回路22とを備えて
おり、前記受光部14の出力に基づいて前記ランプ13の発
光量が一定となるようにランプ13の電圧（または、電
流）を制御する。The control unit 15 controls the value of the light amount detection signal and the light amount setting device 20.
The amplifier 13 that amplifies and outputs the difference, and the lamp 13 that outputs the difference signal according to the value of the difference signal output from the amplifier 21.
In addition to controlling the brightness of the lamp, the tube current of the lamp 13 increases due to a decrease in luminous efficiency due to the life of the lamp, and when the tube current value exceeds a predetermined value, a lamp abnormality signal indicating that the lamp 13 has deteriorated is generated. An illumination power supply circuit 22 is provided, and the voltage (or current) of the lamp 13 is controlled based on the output of the light receiving unit 14 so that the light emission amount of the lamp 13 becomes constant.
このように、この実施例においては、受光部14に指向
性を持たせてランプ13自体の輝度だけを測定するので、
実装基板検査装置のＸ−Ｙテーブル部25にセットされる
実装基板26の色もしくは明度が変わってもランプ13の発
光量を一定にすることができる。Thus, in this embodiment, since the light receiving section 14 is provided with directivity and only the brightness of the lamp 13 itself is measured,
Even if the color or the brightness of the mounting substrate 26 set on the XY table 25 of the mounting substrate inspecting device changes, the light emission amount of the lamp 13 can be made constant.
また、センサハウジング16と、レンズ18とによってフ
ォトセンサ17を密閉しているので、フォトセンサ17の受
光面にゴミや、ホコリ等が付着しないようにすることが
できる。Further, since the photo sensor 17 is hermetically sealed by the sensor housing 16 and the lens 18, it is possible to prevent dust, dust and the like from adhering to the light receiving surface of the photo sensor 17.
また、ランプ13の輝度を直接、測定することができる
ので、ランプ13の多灯化しても各ランプ13の横に、受光
部14を各々配置することにより、各ランプ13の明るさを
個々に制御することができる。Further, since the brightness of the lamps 13 can be directly measured, even if the number of the lamps 13 is increased, by arranging the light receiving portions 14 beside each lamp 13, the brightness of each lamp 13 can be individually measured. Can be controlled.
《発明の効果》 以上説明したように本発明によれば、照明装置の照明
光量を制御するのに不具合がないように照射光量の受光
部を出射範囲及び撮像範囲を遮らない位置に配設される
ので、被検査対象物からの反射光を撮像して検査する際
に影響がないという効果がある。<< Effects of the Invention >> As described above, according to the present invention, the light-receiving unit for the irradiation light amount is arranged at a position that does not block the emission range and the imaging range so that there is no problem in controlling the illumination light amount of the lighting device. Therefore, there is an effect that there is no influence when the reflected light from the inspection object is imaged and inspected.
また、第１の発明においては、光学系に入射する光か
ら赤外線領域を除去する赤外線遮光手段を備えている結
果、受光部内の温度上昇を抑え、フォトセンサの温度特
性変化による受光信号の変動をなくして、照明体の発光
量が誤差の少ない制御を可能とする。Further, in the first aspect of the invention, as a result of including the infrared ray shielding means for removing the infrared ray region from the light incident on the optical system, the temperature rise in the light receiving portion is suppressed, and the fluctuation of the light receiving signal due to the temperature characteristic change of the photo sensor is suppressed. Without this, it is possible to control the light emission amount of the illumination body with a small error.
更に、第２の発明においては、制御部は、照明体の発
光量を所定の発光量に制御できなくなったときに警報を
報知する報知手段を備えているために、この警報によっ
て、照明体の交換時期が作業者に明示され、タイミング
良く交換することによって、最適な条件の下に、被検査
対象物を撮像して、画像処理装置側の画像処理を常に正
確なものとする。Further, in the second aspect of the invention, since the control unit is provided with the notification means for issuing an alarm when the light emission amount of the illumination body cannot be controlled to a predetermined light emission amount, the alarm causes the illumination body When the replacement time is clearly indicated to the operator and the replacement is performed at a proper timing, the object to be inspected is imaged under the optimum conditions, and the image processing on the image processing apparatus side is always accurate.
第１図は本発明による照明装置の一実施例を示す概略構
成図、第２図は同実施例の詳細な構成図、第３図は従来
の照明装置の一例を示す断面図、第４図はこのような照
明装置で用いられるランプの特性を示す模式図、第５図
は従来の照明装置を改良するために考えられた照明装置
の一例を示す断面図、第６図は従来の照明装置を改良す
るために考えられた照明装置の他の例を示す断面図であ
る。 12……シェード、13……ランプ、14……受光部、15……
制御部。FIG. 1 is a schematic configuration diagram showing an embodiment of a lighting device according to the present invention, FIG. 2 is a detailed configuration diagram of the same embodiment, FIG. 3 is a sectional view showing an example of a conventional lighting device, and FIG. Is a schematic diagram showing the characteristics of a lamp used in such a lighting device, FIG. 5 is a cross-sectional view showing an example of a lighting device conceived to improve the conventional lighting device, and FIG. 6 is a conventional lighting device. It is sectional drawing which shows the other example of the illuminating device considered in order to improve. 12 …… Shade, 13 …… Lamp, 14 …… Light receiving part, 15 ……
Control unit.
Claims (2)
光部と、この受光部によって得られた前記照明体の明る
さに基づいて前記照明体の発光量を制御する制御部と、
被検査対象物に照明光を照射してその反射光を撮像する
撮像部とを備えた照明装置において、前記受光部が、受
光面が前記照明体と対向するように配置されたフォトセ
ンサと、前記照明体の表面から発せられた光のみを前記
フォトセンサの受光面に集光させる光学系と、前記光学
系に入射する光から赤外線領域を除去する赤外線遮光手
段とを備え、前記受光部を、前記照明体から前記被検査
対象物に出射する出射光を遮らず且つ前記被検査対象物
を撮像する前記撮像部の撮像視野を遮らない位置に配置
したことを特徴とする照明装置。1. An illumination body for irradiating an object to be inspected with light, a light receiving section, and a control section for controlling the light emission amount of the illumination body based on the brightness of the illumination body obtained by the light receiving section. ,
In an illumination device including an imaging unit that illuminates an object to be inspected with illumination light and images the reflected light thereof, the light receiving unit has a photosensor arranged such that a light receiving surface faces the illumination body, An optical system for condensing only the light emitted from the surface of the illuminating body on the light receiving surface of the photosensor, and an infrared light shielding means for removing an infrared region from the light incident on the optical system are provided, and the light receiving unit is provided. The illumination device is arranged at a position that does not block outgoing light emitted from the illuminating body to the inspection target and does not block an imaging field of view of the imaging unit that images the inspection target.
光部と、この受光部によって得られた前記照明体の明る
さに基づいて前記照明体の発光量を制御する制御部と、
被検査対象物に照明光を照射してその反射光を撮像する
撮像部とを備えた照明装置において、前記受光部が、受
光面が前記照明体と対向するように配置されたフォトセ
ンサと、前記照明体の表面から発せられた光のみを前記
フォトセンサの受光面に集光させる光学系とを備え、前
記受光部を、前記照明体から前記被検査対象物に出射す
る出射光を遮らず且つ前記被検査対象物を撮像する前記
撮像部の撮像視野を遮らない位置に配置し、且つ、前記
制御部が前記照明体の発光量を所定の発光量に制御する
と共に所定の発光量に制御できなくなったときに警報を
報知する報知手段を備えていることを特徴とする照明装
置。2. An illumination body for irradiating an object to be inspected with light, a light receiving section, and a control section for controlling the light emission amount of the illumination body based on the brightness of the illumination body obtained by the light receiving section. ,
In an illumination device including an imaging unit that illuminates an object to be inspected with illumination light and images the reflected light thereof, the light receiving unit has a photosensor arranged such that a light receiving surface faces the illumination body, An optical system for condensing only the light emitted from the surface of the illuminating body on the light receiving surface of the photosensor, and the light receiving section does not block the emitted light emitted from the illuminating body to the inspection object. The control unit controls the light emission amount of the illumination body to a predetermined light emission amount, and the light emission amount of the illumination body is controlled to a predetermined light emission amount. An illuminating device characterized by comprising an informing means for informing an alarm when it is no longer possible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61269568A JPH0827239B2 (en) | 1986-11-14 | 1986-11-14 | Lighting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61269568A JPH0827239B2 (en) | 1986-11-14 | 1986-11-14 | Lighting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63124938A JPS63124938A (en) | 1988-05-28 |
| JPH0827239B2 true JPH0827239B2 (en) | 1996-03-21 |
Family
ID=17474172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61269568A Expired - Lifetime JPH0827239B2 (en) | 1986-11-14 | 1986-11-14 | Lighting equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0827239B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06138040A (en) * | 1992-10-26 | 1994-05-20 | Ishikawajima Harima Heavy Ind Co Ltd | Illumination controller of light source in inspection device |
| JP3222982B2 (en) * | 1993-05-18 | 2001-10-29 | 三洋電機株式会社 | Component recognition device |
| JP3769089B2 (en) * | 1997-01-20 | 2006-04-19 | ヤマハ発動機株式会社 | Component recognition device for mounting machine |
| JP3761313B2 (en) * | 1997-12-19 | 2006-03-29 | シーケーディ株式会社 | Tablet appearance inspection method, tablet appearance inspection device and blister sheet packaging machine |
| US6236044B1 (en) * | 1998-08-21 | 2001-05-22 | Trw Inc. | Method and apparatus for inspection of a substrate by use of a ring illuminator |
| JP2006140519A (en) * | 2005-12-28 | 2006-06-01 | Yamaha Motor Co Ltd | Component-recognizing device for mounting machine |
| JP6889572B2 (en) * | 2017-02-24 | 2021-06-18 | 株式会社キーエンス | Visual inspection equipment and lighting equipment for visual inspection |
| WO2020184695A1 (en) * | 2019-03-14 | 2020-09-17 | 株式会社アイテックシステム | Light irradiation system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4028728A (en) | 1976-04-02 | 1977-06-07 | Western Electric Company, Inc. | Method of and video system for identifying different light-reflective surface areas on articles |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5431834A (en) * | 1977-08-16 | 1979-03-08 | Nippon Carbureter | Feeder of liquefied gas fuel of internal combustion engine |
| JPH0143635Y2 (en) * | 1980-02-06 | 1989-12-18 | ||
| JPS56116654A (en) * | 1980-02-20 | 1981-09-12 | Nec Corp | Manufacturing of lead frame for semiconductor device |
| JPS60195405A (en) * | 1984-03-19 | 1985-10-03 | Hitachi Tokyo Electronics Co Ltd | Recognizing device |
-
1986
- 1986-11-14 JP JP61269568A patent/JPH0827239B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4028728A (en) | 1976-04-02 | 1977-06-07 | Western Electric Company, Inc. | Method of and video system for identifying different light-reflective surface areas on articles |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63124938A (en) | 1988-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |