JP6947494B2 - Lighting control power supply and inspection system - Google Patents

Lighting control power supply and inspection system Download PDF

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JP6947494B2
JP6947494B2 JP2016148857A JP2016148857A JP6947494B2 JP 6947494 B2 JP6947494 B2 JP 6947494B2 JP 2016148857 A JP2016148857 A JP 2016148857A JP 2016148857 A JP2016148857 A JP 2016148857A JP 6947494 B2 JP6947494 B2 JP 6947494B2
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strobe
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led illuminator
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JP2018017631A (en
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裕一郎 田中
裕一郎 田中
浩平 島田
浩平 島田
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CCS Inc
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    • 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
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components

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  • Engineering & Computer Science (AREA)
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  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Stroboscope Apparatuses (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
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Description

本発明は、ＬＥＤ照明器のストロボ発光状態を制御する照明制御電源、及び、それを用いた検査システムに関するものである。 The present invention relates to a lighting control power supply that controls a strobe light emitting state of an LED illuminator, and an inspection system using the same.

例えば製品の外観検査を行う場合、ＬＥＤ照明器をストロボ発光させてカメラにより製品を撮像することがある。この際、製品やＬＥＤ照明器の特性に合わせてストロボ発光の状態が前記ＬＥＤ照明に接続される照明制御電源によって制御されている（特許文献１参照）。 For example, when the appearance of a product is inspected, the LED illuminator may be made to emit a strobe light and the product may be imaged by a camera. At this time, the state of strobe light emission is controlled by the lighting control power supply connected to the LED lighting according to the characteristics of the product and the LED lighting device (see Patent Document 1).

ところで、ＬＥＤ照明器が別々に設けられた検査ラインが複数あり、各検査ラインに複数種類の製品が流されていることもある。このような場合には、各検査ラインでの検査精度を均一にするために各ＬＥＤ照明器の機差と、製品の種類ごとの違いという２種類のパラメータに合わせたストロボ発光を実現する必要がある。 By the way, there are a plurality of inspection lines in which LED illuminators are separately provided, and a plurality of types of products may be flown in each inspection line. In such a case, in order to make the inspection accuracy on each inspection line uniform, it is necessary to realize strobe light emission that matches two types of parameters: the difference of each LED illuminator and the difference of each product type. be.

このような要求を満たすため、照明制御電源にはストロボ発光幅と、定電圧制御によりＬＥＤ照明器に印加される電圧の目標電圧値と、を独立に設定可能に構成されたものがある。このようなものであれば、例えば各ＬＥＤ照明器の機差が吸収されるようにそれぞれストロボ発光幅を異ならせたうえで、製品の種類に応じて定電圧制御における目標電圧値を変化させることができる。したがって、ＬＥＤ照明器によらずある製品に対して各ＬＥＤ照明器に印加する目標電圧値を揃えることができ、ストロボ発光の状態を設定しやすい。 In order to satisfy such a requirement, some lighting control power supplies are configured so that the strobe emission width and the target voltage value of the voltage applied to the LED illuminator by constant voltage control can be set independently. If this is the case, for example, the strobe emission width should be different so that the difference between the LED illuminators can be absorbed, and then the target voltage value in constant voltage control should be changed according to the type of product. Can be done. Therefore, it is possible to make the target voltage value applied to each LED illuminator uniform for a certain product regardless of the LED illuminator, and it is easy to set the state of strobe light emission.

特開2009-162728号公報Japanese Unexamined Patent Publication No. 2009-162728

しかしながら、ストロボ発光ではＬＥＤ照明器が発光している時間が非常に短いため、定電圧制御の目標電圧値を製品に応じて変更すると、目標電圧値によっては大きな制御遅れが発生し、例えばカメラのシャッタ開放時間中に十分な光量が製品に対して照射されていないことが起こり得る。 However, in strobe light emission, the LED illuminator emits light for a very short time, so if the target voltage value for constant voltage control is changed according to the product, a large control delay will occur depending on the target voltage value, for example, in a camera. It is possible that the product is not exposed to a sufficient amount of light during the shutter opening time.

本発明は上述したような問題を鑑みてなされたものであり、２つの独立なパラメータでストロボ発光の状態を設定でき、かつ、パラメータの設定を変更しても制御遅れが発生しにくい照明制御電源、及び、それを用いた検査システムを提供することを目的とする。 The present invention has been made in view of the above-mentioned problems, and is a lighting control power supply that can set the strobe light emission state with two independent parameters and is less likely to cause a control delay even if the parameter settings are changed. , And an inspection system using the same.

すなわち、本発明に係る照明制御電源は、ストロボ発光可能に構成されたＬＥＤ照明器に電力を供給する照明制御電源であって、ストロボ発光幅と前記ストロボ発光幅内における前記ＬＥＤ照明器の点灯割合の設定値を受け付ける受付部と、前記ストロボ発光幅の設定値を連続したＯＮ期間として設定したＯＮ／ＯＦＦ信号を出力し、前記ＬＥＤ照明器がストロボ発光可能な期間の長さを制御するストロボ発光幅制御器と、前記ＬＥＤ照明器がストロボ発光可能な期間内においてＯＮ期間とＯＦＦ期間の割合が前記点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力し、点灯割合を制御する点灯割合制御器と、前記ストロボ発光幅制御器と前記点灯割合制御器のそれぞれからＯＮ／ＯＦＦ信号が入力され、各ＯＮ／ＯＦＦ信号を乗算した最終出力信号を前記ＬＥＤ照明器へ出力する乗算器と、を備えたことを特徴とする。 That is, the lighting control power supply according to the present invention is a lighting control power supply that supplies power to an LED illuminator configured to be capable of strobe light emission, and is a strobe light emission width and a lighting ratio of the LED illuminator within the strobe light emission width. A reception unit that accepts the set value of, and an ON / OFF signal that sets the set value of the strobe emission width as a continuous ON period are output, and the strobe light emission that controls the length of the period during which the LED illuminator can emit the strobe light. The width controller and the LED illuminator output an ON / OFF signal set so that the ratio of the ON period and the OFF period becomes the set value of the lighting ratio within the period in which the strobe can emit light, and control the lighting ratio. An ON / OFF signal is input from each of the lighting ratio controller, the strobe emission width controller, and the lighting ratio controller, and the final output signal obtained by multiplying each ON / OFF signal is output to the LED illuminator. It is characterized by having.

ここで、ストロボ発光とは所定時間よりも短い時間内においてＬＥＤ照明器を１又は複数回発光させることを言う。 Here, the strobe light emission means that the LED illuminator is made to emit light once or a plurality of times within a time shorter than a predetermined time.

このようなものであれば、前記ストロボ発光幅と、前記点灯割合の２つのパラメータにより独立に前記ＬＥＤ照明器のストロボ発光の状態を制御できるので、制御の自由度は従来と同等に保ちつつ、ストロボ発光時に前記ＬＥＤ照明器に印加する電圧は一定にすることができる。したがって、ストロボ発光の設定の自由度は高くしながら、制御遅れの発生は低減できる。 In such a case, the strobe light emission state of the LED illuminator can be controlled independently by the two parameters of the strobe light emission width and the lighting ratio, so that the degree of freedom of control can be maintained at the same level as before. The voltage applied to the LED illuminator at the time of strobe light emission can be made constant. Therefore, it is possible to reduce the occurrence of control delay while increasing the degree of freedom in setting the strobe light emission.

前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間中に前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の一部が外れた状態にならず、確実に全体が含まれるようにして前記点灯割合が実現されるようにするには、前記点灯割合制御器が、前記ストロボ発光幅の設定値の整数分の１を制御周期として算出する制御周期算出部と、前記制御周期算出部で算出された制御周期ごとにＯＮ期間又はＯＦＦ期間の長さが設定可能であり、前記ＬＥＤ照明器がストロボ発光可能な期間内におけるＯＮ期間の和とＯＦＦ期間の和の割合が前記点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力する点灯割合信号出力部と、を備えたものであればよい。 During the ON period of the ON / OFF signal output from the strobe light emission width controller, a part of the ON period of the ON / OFF signal output from the lighting ratio controller is not out of the state, and the whole is surely as a whole. In order to realize the lighting ratio so as to be included, the lighting ratio controller has a control cycle calculation unit that calculates a fraction of an integral part of the set value of the strobe light emission width as a control cycle, and the above. The length of the ON period or the OFF period can be set for each control cycle calculated by the control cycle calculation unit, and the ratio of the sum of the ON period and the sum of the OFF period within the period during which the LED illuminator can emit strobe light is Any device may be provided with a lighting ratio signal output unit that outputs an ON / OFF signal set to be the set value of the lighting ratio.

前記ストロボ発光幅内において前記ＬＥＤ照明器に点消灯を繰り返させて、時間的に均一なストロボ発光を実現できるようにするには、前記点灯割合信号出力部が、複数の制御周期においてＯＮ期間とＯＦＦ期間の割合が同じ値に設定されたＯＮ／ＯＦＦ信号を出力するように構成されていればよい。 In order to allow the LED illuminator to repeatedly turn on and off within the strobe light emission width to realize timely uniform strobe light emission, the lighting ratio signal output unit is set to an ON period in a plurality of control cycles. It may be configured to output an ON / OFF signal in which the ratio of the OFF period is set to the same value.

前記ストロボ発光幅内における光量についてＰＷＭ制御とほぼ同様の態様で簡便に制御できるようにするには、前記点灯割合信号出力部が、複数の制御周期においてＯＮ期間とＯＦＦ期間の割合が同じ値に設定されたＯＮ／ＯＦＦ信号を出力するように構成されていればよい。 In order to make it possible to easily control the amount of light within the strobe emission width in almost the same manner as PWM control, the lighting ratio signal output unit sets the ratio of the ON period and the OFF period to the same value in a plurality of control cycles. It may be configured to output the set ON / OFF signal.

前記ストロボ発光幅が短く設定されており、各制御周期において出力可能なパルス幅で同じ態様で出力を繰り返しても実現できない階調を実質的に実現できるようにし、前記点灯割合に対して実現できる階調数をより多くできるようにするには、前記ストロボ発光幅が所定値以下の場合には前記制御周期算出部が、当該ストロボ発光幅内に複数の制御周期が含まれるようにその時間長さを設定するとともに、前記点灯割合信号出力部が、少なくとも一部の制御周期について他の制御周期とはＯＮ期間とＯＦＦ期間の割合を異ならせるように構成されていればよい。 The strobe emission width is set short, and it is possible to substantially realize a gradation that cannot be realized even if the output is repeated in the same manner with the pulse width that can be output in each control cycle, and it can be realized with respect to the lighting ratio. In order to increase the number of gradations, when the strobe emission width is equal to or less than a predetermined value, the control cycle calculation unit determines the time length so that a plurality of control cycles are included in the strobe emission width. The lighting ratio signal output unit may be configured so that the ratio of the ON period and the OFF period is different from that of the other control cycles for at least a part of the control cycles.

前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号を構成する各パルスがほぼ制御遅れが発生しないようにして、前記ストロボ発光幅内で確実に前記ＬＥＤ照明器が点灯するようにするには、前記制御周期算出部が、前記点灯割合信号出力部から出力できる最小パルス幅よりも長い周期の制御周期を算出するように構成されていればよい。 In order to ensure that each pulse constituting the ON / OFF signal output from the lighting ratio controller does not cause a control delay and the LED illuminator is surely lit within the strobe emission width. The control cycle calculation unit may be configured to calculate a control cycle having a period longer than the minimum pulse width that can be output from the lighting ratio signal output unit.

前記ストロボ発光幅が短い場合でも、前記点灯割合による光量の制御が十分に行えるようにするには、前記制御周期算出部が、前記ストロボ発光幅に対して実質的に１／２の時間長さを前記制御周期として算出するように構成されていればよい。 Even when the strobe light emission width is short, in order to sufficiently control the amount of light by the lighting ratio, the control cycle calculation unit has a time length substantially 1/2 of the strobe light emission width. It may be configured to calculate as the control cycle.

前記ストロボ発光幅内に前記点灯割合信号出力部から出力されるＯＮ／ＯＦＦ信号のＯＮ期間が欠けることなく含まれるようにし、必要な光量が確保されるようにするには、前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号中におけるＯＮ期間の出力開始タイミングと、前記点灯割合信号出力部から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の出力開始タイミングとが同期するように構成されていればよい。 In order to ensure that the ON period of the ON / OFF signal output from the lighting ratio signal output unit is included in the strobe emission width without missing, and the required amount of light is secured, the strobe emission width control is performed. The output start timing of the ON period in the ON / OFF signal output from the device shall be synchronized with the output start timing of the ON period of the ON / OFF signal output from the lighting ratio signal output unit. Just do it.

検査対象からの反射光が十分にカメラに取り込まれるように、所望の照明態様での検査が実現できるようにするには、本発明に係る照明制御電源と、検査対象に光が照射されるように配置された前記ＬＥＤ照明器と、前記検査対象を撮像可能な位置に配置されたカメラと、前記カメラのシャッタの開閉を制御するシャッタ制御部と、を備え、前記シャッタ制御部が、前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の出力開始タイミングよりも前にシャッタを開放させ、前記ＯＮ期間の出力終了タイミングよりも後でシャッタを閉じるように構成されている検査システムであればよい。 In order to enable the inspection in a desired lighting mode so that the reflected light from the inspection target is sufficiently taken into the camera, the lighting control power supply according to the present invention and the inspection target are irradiated with the light. The LED illuminator arranged in the above, a camera arranged at a position where the inspection target can be imaged, and a shutter control unit for controlling the opening and closing of the shutter of the camera, and the shutter control unit is the strobe. An inspection system configured to open the shutter before the output start timing of the ON period of the ON / OFF signal output from the light emission width controller and close the shutter after the output end timing of the ON period. It should be.

このように本発明に係る照明制御電源であれば、２つの独立した自由度を持つパラメータでストロボ発光時の光量を制御することができ、しかも、電圧印加時には常に同じ目標電圧値の定電圧制御でパルスを制御できるのでストロボ発光制御における制御遅れが発生するのを防ぐことができる。 As described above, in the lighting control power supply according to the present invention, the amount of light at the time of strobe light emission can be controlled by parameters having two independent degrees of freedom, and the constant voltage control of the same target voltage value is always performed when a voltage is applied. Since the pulse can be controlled with, it is possible to prevent a control delay in strobe light emission control from occurring.

本発明の一実施形態に係る照明制御電源、及び、検査システムを示す模式図。The schematic diagram which shows the lighting control power source and inspection system which concerns on one Embodiment of this invention. 同実施形態における照明制御電源の構成を示す機能ブロック図。The functional block diagram which shows the structure of the lighting control power source in the same embodiment. 同実施形態における製品Ａの検査時の各照明制御電源での出力を示す模式的タイミングチャート。The schematic timing chart which shows the output of each lighting control power source at the time of inspection of the product A in the same embodiment. 同実施形態における製品Ｂの検査時の各照明制御電源での出力を示す模式的タイミングチャート。The schematic timing chart which shows the output of each lighting control power source at the time of inspection of the product B in the same embodiment. 本発明の別の実施形態に係る照明制御電源での出力を示す模式的タイミングチャート。Schematic timing chart showing the output of the lighting control power supply according to another embodiment of the present invention.

本発明の第１実施形態に係る照明制御電源２、及び、検査システム１００について図１乃至図４を参照しながら説明する。 The lighting control power supply 2 and the inspection system 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

第１実施形態の検査システム１００は、複数の検査ラインを有し、１つの検査ラインにおいて光に対する反射、透過、吸収特性の異なる検査対象が複数種類流されるものである。 The inspection system 100 of the first embodiment has a plurality of inspection lines, and a plurality of types of inspection targets having different reflection, transmission, and absorption characteristics for light are flown in one inspection line.

１つの検査システム１００について詳述すると、図１に示すようにリング状の照明であるＬＥＤ照明器１と、前記ＬＥＤ照明器１の発光態様を制御する照明制御電源２と、前記ＬＥＤ照明器１で光が照射された検査対象の画像を撮像するカメラ３と、前記カメラ３のシャッタを前記照明制御電源２と連動させて制御するシャッタ制御部４と、を備えている。この検査システム１００は、前記ＬＥＤ照明器１の直下に検査対象が運ばれてきた際に、当該ＬＥＤ照明器１をストロボ発光させる。前記検査対象からのストロボ光の反射光は前記ＬＥＤ照明器１の中央の開口を通って前記カメラ３内に入射するようにしてある。また、前記シャッタ制御部４は、ＣＰＵ、メモリ、入出力手段、Ａ／Ｃ・Ｄ／Ｃコンバータ等を備えた制御ボードであって、前記カメラ３のシャッタの開放時間、及び、そのタイミングを制御するものである。本実施形態では前記シャッタ制御部４は前記照明制御電源２の動作と連動するように構成してある。 The one inspection system 100 will be described in detail. As shown in FIG. 1, an LED illuminator 1 which is ring-shaped illumination, an illumination control power supply 2 which controls a light emitting mode of the LED illuminator 1, and the LED illuminator 1 It includes a camera 3 that captures an image of an inspection target irradiated with light, and a shutter control unit 4 that controls the shutter of the camera 3 in conjunction with the lighting control power supply 2. When the inspection target is brought directly under the LED illuminator 1, the inspection system 100 causes the LED illuminator 1 to emit a strobe light. The reflected light of the strobe light from the inspection target is made to enter the camera 3 through the central opening of the LED illuminator 1. Further, the shutter control unit 4 is a control board including a CPU, a memory, an input / output means, an A / C / D / C converter, and the like, and controls the opening time of the shutter of the camera 3 and its timing. Is what you do. In the present embodiment, the shutter control unit 4 is configured to be linked with the operation of the lighting control power supply 2.

前記ＬＥＤ照明器１は、概略リング状に構成してあり、中心軸方向へ向かって傾斜した内側周面を有している。この内側周面上には多数のＬＥＤが均一に配列してあり、各ＬＥＤの光軸が前記検査対象上に集まるようにしてある。 The LED illuminator 1 is formed in a substantially ring shape and has an inner peripheral surface inclined toward the central axis direction. A large number of LEDs are uniformly arranged on the inner peripheral surface so that the optical axes of the LEDs are gathered on the inspection target.

前記照明制御電源２は、前記ＬＥＤ照明器１の直下に前記検査対象が配置されたタイミングで前記ＬＥＤ照明器１をストロボ発光させるための電力を供給するとともに、そのストロボ発光の状態をユーザにより設定されたストロボ発光幅、及び、点灯割合となるように制御するものである。すなわち、この照明制御電源２は、前記ＬＥＤ照明器１が発光可能な期間であるストロボ発光幅と、前記ストロボ発光幅内において複数回点灯、消灯をさせた際における点灯割合の２つのパラメータによりストロボ発光の状態を２自由度で制御できるようにしてある。また、前記照明制御電源２は定電圧制御により前記ＬＥＤ照明器１に流れる電流は各パルスにおいて一定値となるようにしてあり、この定電圧制御時の目標電圧値については予め固定してある。 The lighting control power supply 2 supplies electric power for strobe light emission of the LED illuminator 1 at the timing when the inspection target is arranged directly under the LED illuminator 1, and the strobe light emission state is set by the user. It is controlled so that the strobe light emission width and the lighting ratio are set. That is, the lighting control power supply 2 has a strobe light according to two parameters: a strobe light emission width during which the LED illuminator 1 can emit light, and a lighting ratio when the LED illuminator 1 is turned on and off a plurality of times within the strobe light emission width. The state of light emission can be controlled with two degrees of freedom. Further, the lighting control power supply 2 is set so that the current flowing through the LED illuminator 1 becomes a constant value in each pulse by constant voltage control, and the target voltage value at the time of constant voltage control is fixed in advance.

前記照明制御電源２は、ハードウェアとしてＣＰＵ、メモリ、Ａ／Ｄ・Ｄ／Ａコンバータ等を有する制御ボードを備えたものである。そして、前記照明制御電源２は、図２の機能ブロック図に示すようにメモリに格納されている照明制御用プログラムが実行されて各種機器と協業することにより、少なくとも受付部２１、ストロボ発光幅制御器２４、点灯割合制御器２５、乗算器２８としての機能を発揮するものである。以下に各部の構成及びその動作の詳細について説明する。 The lighting control power supply 2 includes a control board having a CPU, a memory, an A / D / D / A converter, and the like as hardware. Then, as shown in the functional block diagram of FIG. 2, the lighting control power supply 2 controls at least the reception unit 21 and the strobe emission width by executing the lighting control program stored in the memory and collaborating with various devices. It exhibits the functions of the device 24, the lighting ratio controller 25, and the multiplier 28. The configuration of each part and the details of its operation will be described below.

前記受付部２１は、ストロボ発光の発光状態を設定するためのパラメータであるストロボ発光幅、及び、点灯割合の設定値について設定ダイヤル等の入出力手段を介してユーザから受け付けるものである。 The reception unit 21 receives from the user via an input / output means such as a setting dial about the strobe light emission width and the setting value of the lighting ratio, which are parameters for setting the light emission state of the strobe light emission.

本実施形態では、前記受付部２１はストロボ発光幅に関する設定値を受け付けるストロボ発光幅受付部２２と、点灯割合に関する設定値を受け付ける点灯割合受付部２３と、からなる。ここで、ストロボ発光幅とは前記ＬＥＤ照明器１の発光が許可される期間を設定するためのパラメータである。本実施形態ではストロボ発光幅は１μｓ以上１０００μｓ以下の期間に設定できるようにしてあり、この時間内での１又は複数回の発光をストロボ発光と定義できる。また、点灯割合はストロボ発光幅内において前記ＬＥＤ照明器１を点灯及び消灯させた場合において、ストロボ発光幅の時間長さに対して前記ＬＥＤ照明器１が点灯している時間の総和が占める割合を設定するためのパラメータである。 In the present embodiment, the reception unit 21 includes a strobe light emission width reception unit 22 that receives a set value related to the strobe light emission width, and a lighting ratio reception unit 23 that receives a set value related to the lighting ratio. Here, the strobe light emission width is a parameter for setting a period during which light emission of the LED illuminator 1 is permitted. In the present embodiment, the strobe emission width can be set in a period of 1 μs or more and 1000 μs or less, and one or more times of emission within this period can be defined as strobe emission. The lighting ratio is the ratio of the total time during which the LED illuminator 1 is lit to the time length of the strobe emission width when the LED illuminator 1 is turned on and off within the strobe emission width. It is a parameter for setting.

前記ストロボ発光幅制御器２４、及び、前記点灯割合制御器２５は、前記受付部２１で受け付けられたストロボ発光幅及び点灯割合の設定値に基づいてそれぞれ別々のＯＮ／ＯＦＦ信号を出力するものである。前記ストロボ発光幅制御器２４、及び、前記点灯割合制御器２５から出力された各ＯＮ／ＯＦＦ信号は前記乗算器２８において乗算演算され、最終出力信号として前記ＬＥＤ照明器１へ出力される。 The strobe emission width controller 24 and the lighting ratio controller 25 output separate ON / OFF signals based on the set values of the strobe emission width and the lighting ratio received by the reception unit 21. be. Each ON / OFF signal output from the strobe emission width controller 24 and the lighting ratio controller 25 is multiplied by the multiplier 28 and output to the LED illuminator 1 as a final output signal.

より具体的には前記ストロボ発光幅制御器２４は、前記ストロボ発光幅の設定値を連続したＯＮ期間として設定したＯＮ／ＯＦＦ信号を出力し、前記ＬＥＤ照明器１がストロボ発光可能な期間の長さを制御するものである。図３及び図４のタイミングチャートに示すように前記ストロボ発光幅制御器２４から出力されるＯＮ／ＯＦＦ信号のＯＮ期間は、前記シャッタ制御部４により前記カメラ３のシャッタが開放されている期間内に収まるようにしてある。すなわち、前記ストロボ発光幅制御器２４から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の開始タイミングはシャッタの開放タイミングよりも後に設定してあり、ＯＮ期間の終了タイミングはシャッタの閉鎖タイミングよりも前に設定してある。したがって、前記カメラ３のシャッタが開放されている間において任意のタイミングで前記ＬＥＤ照明器１を発光させることができる。 More specifically, the strobe light emission width controller 24 outputs an ON / OFF signal in which the set value of the strobe light emission width is set as a continuous ON period, and the length of the period during which the LED illuminator 1 can emit strobe light. It controls the power. As shown in the timing charts of FIGS. 3 and 4, the ON period of the ON / OFF signal output from the strobe emission width controller 24 is within the period during which the shutter of the camera 3 is opened by the shutter control unit 4. It is designed to fit in. That is, the start timing of the ON period of the ON / OFF signal output from the strobe emission width controller 24 is set after the shutter opening timing, and the end timing of the ON period is set before the shutter closing timing. It has been set. Therefore, the LED illuminator 1 can be made to emit light at an arbitrary timing while the shutter of the camera 3 is open.

前記点灯割合制御器２５は、前記ＬＥＤ照明器１がストロボ発光可能な期間内においてＯＮ期間とＯＦＦ期間の割合が前記受付部２１で受け付けられた点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力し、点灯割合を制御するものである。図３及び図４に示すように本実施形態では前記点灯割合制御器２５は、周期的なＯＮ／ＯＦＦ信号を出力するように構成してある。このＯＮ／ＯＦＦ信号の制御周期は前記受付部２１に受け付けられたストロボ発光幅の時間長さに応じて適宜設定されるようにしてある。 The lighting ratio controller 25 is set so that the ratio of the ON period and the OFF period becomes the set value of the lighting ratio received by the reception unit 21 within the period during which the LED illuminator 1 can emit a strobe light. It outputs an OFF signal and controls the lighting ratio. As shown in FIGS. 3 and 4, in the present embodiment, the lighting ratio controller 25 is configured to output a periodic ON / OFF signal. The control cycle of the ON / OFF signal is appropriately set according to the time length of the strobe emission width received by the reception unit 21.

より詳細に説明すると前記点灯割合制御器２５は、前記受付部２１で受け付けられた前記ストロボ発光幅の設定値の整数分の１を制御周期として算出する制御周期算出部２６と、前記制御周期算出部２６で算出された制御周期ごとにＯＮ期間又はＯＦＦ期間の長さが設定可能であり、前記ＬＥＤ照明器１がストロボ発光可能な期間内におけるＯＮ期間の和とＯＦＦ期間の和の割合が前記点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力する点灯割合信号出力部２７と、を備えている。すなわち、図３に示すように前記点灯割合信号出力部２７が出力するＯＮ／ＯＦＦ信号の周期の時間長さのＮ倍（Ｎ自然数）が、前記受付部２１で受け付けられたストロボ発光幅の設定値の時間長さと一致するようにしてある。本実施形態では、前記ストロボ発光幅制御器２４から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の開始タイミングと、前記点灯割合信号出力部２７から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の開始タイミングとが同時になるように前記点灯割合信号出力部２７を構成してある。また、本実施形態では各周期におけるＯＮ期間とＯＦＦ期間の割合は前記受付部２１で受け付けられた点灯割合の設定値を反映させてあり、各周期において同じパルスが出力されるようにしてある。また、ＯＮ期間の長さは前記点灯割合信号出力部２７から出力可能な最小分解能のパルス幅よりも長く設定してあるとともに前記ストロボ発光幅内において出力されるパルスの数が最も多くなるように前記制御周期算出部２６は制御周期を算出する。例えば前記制御周期算出部２６は、ストロボ発光幅と点灯割合の組み合わせごとに上述した条件を満たす制御周期について予め記憶した参照テーブル（図示しない）を有しており、前記受付部２１で受け付けられた各設定値に対応する制御周期を参照テーブルから取得するように構成してある。 More specifically, the lighting ratio controller 25 includes a control cycle calculation unit 26 that calculates a fraction of an integer of the set value of the strobe light emission width received by the reception unit 21 as a control cycle, and the control cycle calculation unit 26. The length of the ON period or the OFF period can be set for each control cycle calculated by the unit 26, and the ratio of the sum of the ON period and the sum of the OFF period within the period in which the LED illuminator 1 can emit a strobe is the ratio. It includes a lighting ratio signal output unit 27 that outputs an ON / OFF signal set to be a set value of the lighting ratio. That is, as shown in FIG. 3, N times (N natural number) of the time length of the cycle of the ON / OFF signal output by the lighting ratio signal output unit 27 is the setting of the strobe emission width received by the reception unit 21. It is designed to match the time length of the value. In the present embodiment, the start timing of the ON period of the ON / OFF signal output from the strobe emission width controller 24 and the start timing of the ON period of the ON / OFF signal output from the lighting ratio signal output unit 27 The lighting ratio signal output unit 27 is configured so that Further, in the present embodiment, the ratio of the ON period and the OFF period in each cycle reflects the set value of the lighting ratio received by the reception unit 21, so that the same pulse is output in each cycle. Further, the length of the ON period is set longer than the pulse width of the minimum resolution that can be output from the lighting ratio signal output unit 27, and the number of pulses output within the strobe emission width is maximized. The control cycle calculation unit 26 calculates the control cycle. For example, the control cycle calculation unit 26 has a reference table (not shown) that stores in advance a control cycle that satisfies the above-mentioned conditions for each combination of the strobe emission width and the lighting ratio, and is accepted by the reception unit 21. The control cycle corresponding to each set value is configured to be acquired from the reference table.

また、本実施形態では前記点灯割合信号出力部２７から出力されるＯＮ／ＯＦＦ信号は少なくとも２周期分はストロボ発光幅内に含まれるように構成してあり、前記ＬＥＤ照明器１がストロボ発光幅内において点灯している期間が均一に分散するようにしてある。 Further, in the present embodiment, the ON / OFF signal output from the lighting ratio signal output unit 27 is configured to be included in the strobe light emission width for at least two cycles, and the LED illuminator 1 has the strobe light emission width. The period of lighting within is evenly distributed.

前記乗算器２８は、図２に示すように前記ストロボ発光幅制御器２４と前記点灯割合制御器２５のそれぞれからＯＮ／ＯＦＦ信号が入力され、各ＯＮ／ＯＦＦ信号を乗算した最終出力信号を前記ＬＥＤ照明器１へ出力するものである。すなわち、図３及び図４のグラフに示されるように前記乗算器２８は、ユーザがストロボ発光させたい期間のみＯＮ／ＯＦＦ信号を繰り返し出力する。なお、本実施形態では前記乗算器２８は出力するパルスを定電圧制御するように構成してあり、その電圧値は例えば工場出荷時等に予め定められた値に固定してある。 As shown in FIG. 2, the multiplier 28 receives an ON / OFF signal from each of the strobe light emitting width controller 24 and the lighting ratio controller 25, and obtains a final output signal obtained by multiplying each ON / OFF signal. It outputs to the LED illuminator 1. That is, as shown in the graphs of FIGS. 3 and 4, the multiplier 28 repeatedly outputs the ON / OFF signal only during the period in which the user wants the strobe to emit light. In the present embodiment, the multiplier 28 is configured to control the output pulse by a constant voltage, and the voltage value is fixed to a predetermined value, for example, at the time of shipment from a factory.

このように構成された照明制御電源２、及び、検査システム１００における動作の一例について図３のタイミングチャートを参照しながら説明する。 An example of the operation of the lighting control power supply 2 and the inspection system 100 configured in this way will be described with reference to the timing chart of FIG.

なお、図３（ａ）は第１検査ラインに検査対象として製品Ａが前記ＬＥＤ照明器１の直下に流れて来た場合のストロボ発光の制御態様を示すものであり、図３（ｂ）は第２検査ラインに検査対象として製品Ａが前記ＬＥＤ照明器１の直下に流れてきた場合のストロボ発光の制御態様を示すものである。また、図４（ａ）は第１検査ラインに検査対象として製品Ｂが前記ＬＥＤ照明器１の直下に流れて来た場合のストロボ発光の制御態様を示すものであり、図４（ｂ）は第２検査ラインに検査対象として製品Ｂが前記ＬＥＤ照明器１の直下に流れてきた場合のストロボ発光の制御態様を示すものである。 Note that FIG. 3A shows a control mode of strobe light emission when the product A flows directly under the LED illuminator 1 as an inspection target on the first inspection line, and FIG. 3B shows a control mode. The second inspection line shows a control mode of strobe light emission when the product A flows directly under the LED illuminator 1 as an inspection target. Further, FIG. 4A shows a control mode of strobe light emission when the product B flows directly under the LED illuminator 1 as an inspection target on the first inspection line, and FIG. 4B shows a control mode. The second inspection line shows a control mode of strobe light emission when the product B flows directly under the LED illuminator 1 as an inspection target.

図３及び図４に示されるように、検査対象である製品の種類が同じ場合にはＬＥＤ照明器１の機差に関わらず同じ点灯割合のストロボ発光を行うように前記検査システム１００は構成してある。一方、検査対象である製品が同じであっても検査ラインが異なり、前記ＬＥＤ照明器１が異なる場合にはストロボ発光幅を異ならせて機差を吸収し、ＬＥＤ照明器１が異なっていても製品ごとに同じ光量が検査対象に照射されるようにしてある。 As shown in FIGS. 3 and 4, when the types of products to be inspected are the same, the inspection system 100 is configured to emit strobe light having the same lighting ratio regardless of the difference in the LED illuminator 1. There is. On the other hand, even if the products to be inspected are the same, the inspection line is different, and if the LED illuminator 1 is different, the strobe emission width is made different to absorb the machine difference, and even if the LED illuminator 1 is different. The same amount of light is applied to the inspection target for each product.

図３及び図４に示されるように各検査ラインにそれぞれ設けられた照明制御電源２にはユーザによってストロボ発光幅の設定値として例えば２Ｎμｓ、２．２５Ｎμｓが設定してある。これは例えば同じ定電圧制御を行った場合、第１検査ラインのＬＥＤ照明器１のほうが検査ラインの第２ＬＥＤ照明器１よりも光量が大きく出力される傾向を加味し、同じ光量となるように設定してある。 As shown in FIGS. 3 and 4, the lighting control power supply 2 provided in each inspection line is set by the user, for example, 2 Nμs or 2.25 Nμs as a setting value of the strobe light emission width. For example, when the same constant voltage control is performed, the LED illuminator 1 on the first inspection line tends to output a larger amount of light than the second LED illuminator 1 on the inspection line, so that the same amount of light is obtained. It has been set.

次にユーザは各照明制御電源２によらず、製品の種類ごとに共通の点灯割合を各照明制御電源２に入力する。すなわち、製品Ａの場合には点灯割合を５０％とし、製品Ｂの場合には点灯割合を７５％とするように点灯割合の設定値が設定される。 Next, the user inputs a common lighting ratio for each product type to each lighting control power supply 2, regardless of each lighting control power supply 2. That is, in the case of product A, the lighting ratio is set to 50%, and in the case of product B, the lighting ratio is set to 75%.

このように設定されることにより、図３に示されるように製品Ａが流れてきた場合には各検査ラインの照明制御電源２はストロボ発光幅を異ならせつつ、点灯割合については５０％で共通したストロボ発光を各ＬＥＤ照明器１に実行させることができる。 By setting in this way, when product A flows as shown in FIG. 3, the lighting control power supply 2 of each inspection line has a different strobe light emission width, and the lighting ratio is common at 50%. Each LED illuminator 1 can execute the strobe light emission.

一方、図４に示されるように製品Ｂが流れてきた場合には各検査ラインの照明制御電源２はストロボ発光幅を異ならせつつ、点灯割合については７５％で共通したストロボ発光を各ＬＥＤ照明器１に実行させることができる。 On the other hand, as shown in FIG. 4, when the product B flows, the lighting control power supply 2 of each inspection line has different strobe light emission widths, and the strobe light emission common to 75% is illuminated by each LED. It can be executed by the vessel 1.

このように本実施形態に係る検査システム１００は、前記照明制御電源２がストロボ発光幅及び点灯割合の２つパラメータを自由に設定できるので、前記ＬＥＤ照明器１の機差を吸収しつつ、検査対象である製品の種類ごとに同じ状態のストロボ発光を実現し、各検査対象の画像データを得ることが可能となる。 As described above, in the inspection system 100 according to the present embodiment, since the lighting control power supply 2 can freely set two parameters of the strobe light emission width and the lighting ratio, the inspection system 100 inspects while absorbing the machine difference of the LED illuminator 1. It is possible to realize strobe light emission in the same state for each type of target product and obtain image data for each inspection target.

また、前記照明制御電源２では各パルスの目標電圧値が固定された定電圧制御により前記ＬＥＤ照明器１への電力供給が行われるので、従来のように目標電圧値が変更されることによる制御遅れの問題が発生しない。つまり、ストロボ発光幅内において明確な形状のパルス発光を複数回繰り返すことができ、理想的なストロボ発光を実現することができる。 Further, in the lighting control power supply 2, power is supplied to the LED illuminator 1 by constant voltage control in which the target voltage value of each pulse is fixed, so that control by changing the target voltage value as in the conventional case. There is no delay problem. That is, it is possible to repeat pulse light emission having a clear shape a plurality of times within the strobe light emission width, and ideal strobe light emission can be realized.

なお、上述した目標電圧値を固定でき、制御遅れを防ぐことができるという効果は本実施形態の照明制御電源２がストロボ発光幅と点灯割合の２つのパラメータで２自由度の制御を実現できているので、従来と同じ制御の自由度を実現するために目標電圧値を変更しなくてもよいからこそ実現できるものである。 The effect that the above-mentioned target voltage value can be fixed and the control delay can be prevented is that the lighting control power supply 2 of the present embodiment can realize control with two degrees of freedom with two parameters of strobe emission width and lighting ratio. Therefore, it can be realized because it is not necessary to change the target voltage value in order to realize the same degree of freedom of control as in the conventional case.

その他の実施形態について説明する。 Other embodiments will be described.

前記点灯割合信号出力部が設定されている点灯割合によっては制御周期によってＯＮ期間の長さを変更するように構成されていてもよい。すなわち、各制御周期において同じＯＮ期間とＯＦＦ期間を設定すると達成できない点灯割合であっても例えばストロボ発光幅内における最終の制御周期において他の制御周期とは異なるＯＮ期間とＯＦＦ期間の割合でパルスを出力することで実現可能な階調数をさらに増やすことができる。また、ストロボ発光幅内に含まれる制御周期の数又はパルス数は２個以上であってもよいし、１個だけであってもよい。具体的には図５のタイミングチャートに示すようにストロボ発光幅内に３つの制御周期又はパルスが含まれるようにし、最終のパルスの幅を他のパルスの幅と異ならせてもよい。なお、図５の例では点灯割合として４２％が設定されており、このような場合には最終のパルスが他のパルスのほぼ半分に設定して出力されるように前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号が制御される。 Depending on the lighting ratio in which the lighting ratio signal output unit is set, the length of the ON period may be changed depending on the control cycle. That is, even if the lighting ratio cannot be achieved if the same ON period and OFF period are set in each control cycle, for example, in the final control cycle within the strobe emission width, pulses are performed at a ratio of ON period and OFF period different from other control cycles. The number of gradations that can be realized can be further increased by outputting. Further, the number of control cycles or the number of pulses included in the strobe emission width may be two or more, or only one. Specifically, as shown in the timing chart of FIG. 5, the strobe emission width may include three control cycles or pulses, and the width of the final pulse may be different from the width of other pulses. In the example of FIG. 5, 42% is set as the lighting ratio, and in such a case, the final pulse is set to be approximately half of the other pulses and output from the lighting ratio controller. The ON / OFF signal to be output is controlled.

このようなものであれば前記実施形態よりもさらにきめ細やかな階調数を実現したストロボ発光を実現する事が可能となる。 With such a case, it is possible to realize strobe light emission that realizes a finer gradation number than that of the above embodiment.

次に本発明のその他の実施形態について説明する。 Next, other embodiments of the present invention will be described.

前記実施形態では照明制御電源は複数の検査ラインからなる検査システムに用いられるものであったが、１つの検査ラインしか有さない検査システムに用いても構わない。また、検査以外の用途であってもＬＥＤ照明器に所望の態様でストロボ発光させるために前記照明制御電源を用いても構わない。 In the above embodiment, the lighting control power supply is used in an inspection system including a plurality of inspection lines, but it may be used in an inspection system having only one inspection line. Further, the lighting control power supply may be used to make the LED illuminator emit strobe light in a desired mode even for applications other than inspection.

ストロボ発光幅制御器、及び、点灯割合制御器からそれぞれ出力されるＯＮ／ＯＦＦ信号のＯＮ期間は必ずしも開始タイミングが揃っている必要は無く、所定の位相差があって同期していても構わない。要するにストロボ発光幅の長さが点灯割合制御器から出力されるＯＮ／ＯＦＦ信号の制御周期の整数倍がストロボ発光幅と一致するようにしてあればよい。このようなものであれば、ストロボ発光幅内においてＬＥＤ照明器が点灯している時間の総和の割合は受付部に入力された点灯割合に一致させることが可能となる。 The ON periods of the ON / OFF signals output from the strobe emission width controller and the lighting ratio controller do not necessarily have to be the same start timing, and may be synchronized with a predetermined phase difference. .. In short, the length of the strobe emission width may be set so that an integral multiple of the control cycle of the ON / OFF signal output from the lighting ratio controller matches the strobe emission width. In such a case, the ratio of the total amount of time that the LED illuminator is lit within the strobe light emission width can be matched with the lighting ratio input to the reception unit.

また、ＬＥＤ照明器の機差を点灯割合で吸収し、検査対象の特性の違いはストロボ発光幅を変更することで対応し、機差の異なる複数のＬＥＤ照明器で製品ごとに同じストロボ発光状態を実現できるようにしてもよい。 In addition, the difference in the characteristics of the LED illuminator is absorbed by the lighting ratio, and the difference in the characteristics of the inspection target can be dealt with by changing the strobe emission width. May be realized.

また、ストロボ発光幅と点灯割合に加えて印加電圧も調整可能に構成し、これら３つのパラメータで制御するようにしても良い。その他、本発明の趣旨に反しない限りにおいて様々な実施形態の変形や組み合わせを行っても構わない。 Further, the applied voltage may be adjustable in addition to the strobe light emission width and the lighting ratio, and may be controlled by these three parameters. In addition, various embodiments may be modified or combined as long as they do not contradict the gist of the present invention.

１００・・・検査システム
１ ・・・ＬＥＤ照明器
２ ・・・照明制御電源
２１ ・・・受付部
２４ ・・・ストロボ発光幅制御器
２５ ・・・点灯割合制御器
２６ ・・・制御周期算出部
２７ ・・・点灯割合信号出力部
２８ ・・・乗算器

100 ・ ・ ・ Inspection system 1 ・ ・ ・ LED illuminator 2 ・ ・ ・ Lighting control power supply 21 ・ ・ ・ Reception unit 24 ・ ・ ・ Strobe light emission width controller 25 ・ ・ ・ Lighting ratio controller 26 ・ ・ ・ Control cycle calculation Part 27 ・ ・ ・ Lighting ratio signal output part 28 ・ ・ ・ Multiplier

Claims (8)

検査対象に対してストロボ発光可能に構成された検査用のＬＥＤ照明器に電力を供給する検査用照明制御電源であって、
前記検査対象を撮像するカメラに対して設定されるシャッタ開閉幅とは別に設定されるストロボ発光幅と前記ストロボ発光幅内における前記ＬＥＤ照明器の点灯割合の設定値を受け付ける受付部と、
前記ストロボ発光幅の設定値を連続したＯＮ期間として設定したＯＮ／ＯＦＦ信号を出力し、前記ＬＥＤ照明器がストロボ発光可能な期間の長さを制御するストロボ発光幅制御器と、
前記ＬＥＤ照明器がストロボ発光可能な期間内においてＯＮ期間とＯＦＦ期間の割合が前記点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力し、点灯割合を制御する点灯割合制御器と、
前記ストロボ発光幅制御器と前記点灯割合制御器のそれぞれからＯＮ／ＯＦＦ信号が入力され、各ＯＮ／ＯＦＦ信号を乗算した最終出力信号を前記ＬＥＤ照明器へ出力する乗算器と、を備え、
前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号中におけるＯＮ期間の出力開始タイミングと、前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の出力開始タイミングとが同期するように構成されており、
前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号中におけるＯＮ期間が少なくとも前記ＬＥＤ照明器の機差を吸収するように個別に設定され、
前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の割合が、前記検査対象の種類ごとに設定されるように構成されていることを特徴とする検査用照明制御電源。 It is an inspection lighting control power supply that supplies power to the inspection LED illuminator that is configured to be capable of strobe light emission for the inspection target.
A reception unit that receives a strobe light emission width set separately from the shutter opening / closing width set for the camera that images the inspection target and a setting value of the lighting ratio of the LED illuminator within the strobe light emission width.
A strobe emission width controller that outputs an ON / OFF signal in which the set value of the strobe emission width is set as a continuous ON period and controls the length of the period during which the LED illuminator can emit strobe light.
With a lighting ratio controller that outputs an ON / OFF signal set so that the ratio of the ON period and the OFF period becomes the set value of the lighting ratio within the period in which the LED illuminator can emit a strobe light, and controls the lighting ratio. ,
An ON / OFF signal is input from each of the strobe emission width controller and the lighting ratio controller, and a multiplier that outputs a final output signal obtained by multiplying each ON / OFF signal to the LED illuminator is provided.
The output start timing of the ON period in the ON / OFF signal output from the strobe emission width controller is synchronized with the output start timing of the ON period of the ON / OFF signal output from the lighting ratio controller. It is composed and
The ON period in the ON / OFF signal output from the strobe emission width controller is individually set so as to absorb at least the difference of the LED illuminator.
A lighting control power supply for inspection, wherein the ratio of the ON period of the ON / OFF signal output from the lighting ratio controller is set for each type of the inspection target. 前記点灯割合制御器が、
前記ストロボ発光幅の設定値の整数分の１を制御周期として算出する制御周期算出部と、
前記制御周期算出部で算出された制御周期ごとにＯＮ期間又はＯＦＦ期間の長さが設定可能であり、前記ＬＥＤ照明器がストロボ発光可能な期間内におけるＯＮ期間の和とＯＦＦ期間の和の割合が前記点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力する点灯割合信号出力部と、を備えた請求項１記載の検査用照明制御電源。 The lighting ratio controller
A control cycle calculation unit that calculates an integral fraction of the set value of the strobe emission width as a control cycle, and a control cycle calculation unit.
The length of the ON period or the OFF period can be set for each control cycle calculated by the control cycle calculation unit, and the ratio of the sum of the ON period and the sum of the OFF period within the period during which the LED illuminator can emit a strobe light. The lighting control power supply for inspection according to claim 1, further comprising a lighting ratio signal output unit that outputs an ON / OFF signal set to be the set value of the lighting ratio. 前記点灯割合信号出力部が、複数の制御周期においてＯＮ期間とＯＦＦ期間の割合が同じ値に設定されたＯＮ／ＯＦＦ信号を出力するように構成されている請求項２記載の検査用照明制御電源。 The lighting control power supply for inspection according to claim 2, wherein the lighting ratio signal output unit outputs an ON / OFF signal in which the ratios of the ON period and the OFF period are set to the same value in a plurality of control cycles. .. 前記ストロボ発光幅が所定値以下の場合には前記制御周期算出部が、当該ストロボ発光幅内に複数の制御周期が含まれるようにその時間長さを設定するとともに、前記点灯割合信号出力部が、少なくとも一部の制御周期について他の制御周期とはＯＮ期間とＯＦＦ期間の割合を異ならせるように構成されている請求項２又は３記載の検査用照明制御電源。 When the strobe light emission width is equal to or less than a predetermined value, the control cycle calculation unit sets the time length so that a plurality of control cycles are included in the strobe light emission width, and the lighting ratio signal output unit sets the time length. The lighting control power supply for inspection according to claim 2 or 3, wherein the ratio of the ON period and the OFF period is different from that of other control cycles for at least a part of the control cycles. 前記制御周期算出部が、前記点灯割合信号出力部から出力できる最小パルス幅よりも長い周期の制御周期を算出するように構成されている請求項２乃至４いずれかに記載の検査用照明制御電源。 The lighting control power supply for inspection according to any one of claims 2 to 4, wherein the control cycle calculation unit calculates a control cycle having a period longer than the minimum pulse width that can be output from the lighting ratio signal output unit. .. 前記制御周期算出部が、前記ストロボ発光幅に対して実質的に１／２の時間長さを前記制御周期として算出するように構成されている請求項２乃至５いずれかに記載の検査用照明制御電源。 The inspection illumination according to any one of claims 2 to 5, wherein the control cycle calculation unit is configured to calculate a time length substantially 1/2 of the strobe emission width as the control cycle. Control power supply. 請求項１乃至６いずれかに記載の検査用照明制御電源と、
検査対象に光が照射されるように配置された前記ＬＥＤ照明器と、
前記検査対象を撮像可能な位置に配置されたカメラと、
前記カメラのシャッタの開閉を制御するシャッタ制御部と、を備え、
前記シャッタ制御部が、前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の出力開始タイミングよりも前にシャッタを開放させ、前記ＯＮ期間の出力終了タイミングよりも後でシャッタを閉じるように構成されている検査システム。 The inspection lighting control power supply according to any one of claims 1 to 6.
The LED illuminator arranged so that the inspection target is irradiated with light,
A camera arranged at a position where the inspection target can be imaged, and
A shutter control unit that controls the opening and closing of the shutter of the camera is provided.
The shutter control unit opens the shutter before the output start timing of the ON period of the ON / OFF signal output from the strobe emission width controller, and closes the shutter after the output end timing of the ON period. An inspection system that is configured to. 検査対象に対してストロボ発光可能に構成された検査用のＬＥＤ照明器に電力を供給するものであり、前記検査対象を撮像するカメラに対して設定されるシャッタ開閉幅とは別に設定されるストロボ発光幅と前記ストロボ発光幅内における前記ＬＥＤ照明器の点灯割合の設定値を受け付ける受付部と、前記ストロボ発光幅の設定値を連続したＯＮ期間として設定したＯＮ／ＯＦＦ信号を出力し、前記ＬＥＤ照明器がストロボ発光可能な期間の長さを制御するストロボ発光幅制御器と、前記ＬＥＤ照明器がストロボ発光可能な期間内においてＯＮ期間とＯＦＦ期間の割合が前記点灯割合の設定値となるように設定したＯＮ／ＯＦＦ信号を出力し、点灯割合を制御する点灯割合制御器と、前記ストロボ発光幅制御器と前記点灯割合制御器のそれぞれからＯＮ／ＯＦＦ信号が入力され、各ＯＮ／ＯＦＦ信号を乗算した最終出力信号を前記ＬＥＤ照明器へ出力する乗算器と、を備える検査用照明制御電源の設定方法であって、A strobe that supplies power to an LED illuminator for inspection that is configured to be capable of emitting strobe light for the inspection target, and is set separately from the shutter opening / closing width set for the camera that images the inspection target. The reception unit that receives the set value of the light emitting width and the lighting ratio of the LED illuminator within the strobe light emitting width, and the ON / OFF signal that sets the set value of the strobe light emitting width as a continuous ON period are output, and the LED The strobe light emission width controller that controls the length of the period during which the illuminator can emit strobe light, and the ratio of the ON period and the OFF period within the period during which the LED illuminator can emit strobe light become the set value of the lighting ratio. ON / OFF signals are input from each of the lighting ratio controller that outputs the ON / OFF signal set to, and the strobe light emission width controller and the lighting ratio controller to control the lighting ratio, and each ON / OFF signal. A method of setting an inspection lighting control power supply including a multiplier that outputs a final output signal obtained by multiplying by the LED illuminator to the LED illuminator.
前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号中におけるＯＮ期間の出力開始タイミングと、前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の出力開始タイミングとが同期するように設定すること、 The output start timing of the ON period in the ON / OFF signal output from the strobe emission width controller is synchronized with the output start timing of the ON period of the ON / OFF signal output from the lighting ratio controller. To set,
前記ストロボ発光幅制御器から出力されるＯＮ／ＯＦＦ信号中におけるＯＮ期間が少なくとも前記ＬＥＤ照明器の機差を吸収するように個別に設定すること、 Individually set the ON period in the ON / OFF signal output from the strobe emission width controller so as to absorb at least the difference of the LED illuminator.
前記点灯割合制御器から出力されるＯＮ／ＯＦＦ信号のＯＮ期間の割合が、前記検査対象の種類ごとに設定することを特徴とする検査用照明制御電源の設定方法。 A method for setting an inspection lighting control power supply, wherein the ratio of the ON period of the ON / OFF signal output from the lighting ratio controller is set for each type of the inspection target.
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