JP2020205144A - Illumination apparatus - Google Patents

Abstract

To solve the following problem in which illuminance is conventionally required to be changed for each inspection object or each defect before inspection of the inspection object.SOLUTION: The illumination apparatus includes a plurality of illumination modes, can register one or more illuminances to be used in one of the plurality of illumination modes, and is configured for outputting in the one illumination mode at the illuminance registered according to a combination of a plurality of select signals.SELECTED DRAWING: Figure 5

Description

The present invention relates to a lighting device used for product inspection and the like.

Generally, the lighting device mainly includes a light source, a first lens (rod lens), and a diffusing lens. The first lens collects the light emitted from the light source. The diffusing lens diffuses the light collected by the first lens. The diffused light is linearly radiated to a position separated by a predetermined distance. Then, the irradiated light is imaged by the line sensor camera, and the presence or absence of defects (for example, surface defects such as scratches) of various devices is detected by the line sensor camera.

JP-A-2010-203923

However, although the illuminance of the light irradiating the inspection object can be changed in the conventional lighting device, the inspector must manually change the illuminance, and the illuminance is changed for each inspection object or each defect. There is a problem that the inspection takes time because the inspection object must be inspected.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lighting device having both a reduction in inspection time and an improvement in inspection accuracy.

The features of the lighting device according to the present invention are
A light source that emits light of a predetermined brightness,
A storage unit that stores a plurality of dimming values corresponding to each of the plurality of brightnesses of the light emitted from the light source.
A control unit that sequentially reads out each of the plurality of dimming values from the storage unit in a fixed order, generates a drive signal based on the read dimming values, and supplies the drive signal to the light source is provided.
The control unit reads out one dimming value according to the certain order from the plurality of dimming values from the storage unit, and supplies a lighting signal corresponding to the one dimming value as the drive signal. This means that it has a first light emission mode that controls lighting to light the light source.

According to the present invention, the inspection time can be shortened and the inspection accuracy can be improved.

It is the schematic which shows the light emitting mode of the lighting apparatus in this invention. It is a block diagram which shows the lighting system of the inspection apparatus by 1st Embodiment. It is a perspective view which shows the whole structure (appearance) of the lighting apparatus by 1st Embodiment. It is a circuit diagram of the LED substrate of the lighting apparatus according to 1st Embodiment. It is a timing chart of the illumination mode according to 1st Embodiment. It is a list of information used in each lighting mode by 1st Embodiment. It is a flowchart of power-source device control processing by 1st Embodiment. It is a flowchart of the lighting control processing by 1st Embodiment. It is a flowchart of the lighting control processing by 1st Embodiment. It is a flowchart of high-speed dimming mode output processing by 1st Embodiment. It is a flowchart of high-speed pulse mode output processing by 1st Embodiment. It is a flowchart of the normal mode output processing by 1st Embodiment. It is a flowchart of error check processing by 1st Embodiment. It is a block diagram of the illuminance storage table by 1st Embodiment. It is an image diagram displayed on the display of the power supply device according to 1st Embodiment. It is a block diagram which shows the lighting system of the inspection apparatus by 2nd Embodiment. It is a perspective view of the inside of the illuminating apparatus which shows the traveling state of light by 2nd Embodiment. It is a circuit diagram of the LED substrate of the lighting apparatus according to 2nd Embodiment. It is a timing chart of the internal pulse mode according to the 2nd Embodiment. It is a list of the information used in the lighting mode by 2nd Embodiment. It is a flowchart of the control process by 2nd Embodiment. It is a flowchart of the control process by 2nd Embodiment. It is a flowchart of the internal pulse mode output processing by 2nd Embodiment. It is a block diagram of the illuminance storage table by 2nd Embodiment.

<<< Overview of Lighting System >>>
The inspector sets the irradiation of the light emitted from the light source of the lighting device by operating the power supply device, etc., and the lighting device irradiates the light according to the irradiation setting to inspect according to the type of defect of the inspection object. I do.

Specifically, the lighting system has a high speed dimming mode and a high speed pulse mode. In the high-speed dimming mode, a plurality of dimming values (illuminances) are stored in advance, and the plurality of registered dimming values are sequentially read out in a fixed order to output light having an illuminance corresponding to the dimming value from the LED. In this mode, lighting with different illuminance is repeated in a certain order by outputting. On the other hand, in the high-speed pulse mode, a dimming value of 1 corresponding to 1 illuminance is registered (set) in advance, and when the high-speed pulse mode is set, the dimming value of 1 registered in advance corresponds to the dimming value of 1. This is a mode in which lighting and extinguishing are repeated by controlling the continuity or interruption of the analog signal (voltage signal) while maintaining the state in which the analog signal (voltage signal) is output. In this high-speed pulse mode, by repeatedly turning on or off the analog switch, the continuation or interruption of the analog signal (voltage signal) is repeated, and the LED is turned on and off repeatedly.

<<<<<< Outline of the present invention >>>>>
FIG. 1 is a schematic view showing a light emitting mode of the lighting device according to the present invention.

The lighting device in the present invention has a plurality of light emitting modes (first light emitting mode to third light emitting mode described later), and the inspector selects an appropriate light emitting mode to obtain an inspection object or an inspection target. It is possible to inspect the type of defect in an appropriate light emitting mode. The illuminating device of the first embodiment below has a first light emitting mode, and the illuminating device of the second embodiment has a second light emitting mode and illuminating of the third embodiment. The device has a third emission mode.

<First embodiment>
The lighting device of the first embodiment is
A light source that emits light of a predetermined brightness,
A storage unit that stores a plurality of dimming values corresponding to each of the plurality of brightnesses of the light emitted from the light source.
A control unit is provided, which sequentially reads out each of the plurality of dimming values from the storage unit in a fixed order, generates a drive signal based on the read dimming values, and supplies the drive signal to the light source.
The control unit reads out one dimming value in the predetermined order from the plurality of dimming values from the storage unit, and supplies a lighting signal corresponding to the one dimming value as the drive signal. This is a lighting device having a first light emitting mode that controls lighting to light the light source.

The illuminating device of the first embodiment includes a light source, a storage unit, and a control unit (see FIG. 1). The light source emits light of a predetermined brightness. The brightness may be any one that directly or indirectly indicates the brightness of the light emitted from the light source, and may be, for example, illuminance or brightness. Illuminance is the brightness of the light that illuminates the surface of an object and depends on the distance from the light source. Further, the brightness is the brightness of the light source and does not depend on the distance from the light source. When illuminance is adopted as the brightness, the brightness of the light source can be indicated by setting the distance from the light source to a certain distance. The light emitted from the light source illuminates the object to be inspected. Defects to be inspected include convex defects, streak-like defects, concave defects, dents, and dust, and these defects are present on the surface of the inspection object. These defects can be detected by illuminating the object to be inspected.

As shown in FIG. 1, the storage unit has a plurality of dimming values (dimming value 1 (corresponding to the first brightness), dimming value 2 (corresponding to the second brightness), ... Store the value n (corresponding to the nth brightness). The dimming value is a control value for determining the brightness of the light emitted from the light source. Specifically, the control value for setting the light emitted from the light source to the first brightness is the first dimming value, and the control for setting the light emitted from the light source to the second brightness. The value for control is the second dimming value, and the value for control for making the light emitted from the light source the nth brightness is the nth dimming value. The brightness of the light emitted from the light source can be determined by the dimming value, which is a control value. By storing a plurality of dimming values that are different from each other, it is possible to emit light with a brightness corresponding to each of the plurality of dimming values. A plurality of dimming values (for example, dimming value 1, dimming value 2, ...) Can be registered in the storage unit by the inspector, and is desired by the inspector according to the type of defect and the like. Multiple dimming values can be registered.

First, the control unit sequentially reads out each of the plurality of dimming values stored in the storage unit from the storage unit in a fixed order. Next, the control unit generates a drive signal based on the read dimming value and supplies the drive signal to the light source. In this way, the control unit generates a drive signal based on the dimming value. Therefore, the drive signal becomes a signal indicating a dimming value.

Further, the control unit performs lighting control by the lighting signal. The lighting signal is a drive signal for lighting the light source, and by generating a lighting signal indicating one dimming value and supplying it to the light source, light having a brightness corresponding to one dimming value is emitted from the light source. Emitted. Each time the lighting is controlled, one of the plurality of dimming values in a certain order is read out from the storage unit. By controlling in this way, for example,
Dimming value 1 is read out and lighting control of light with brightness corresponding to dimming value 1 → Dimming value 2 is read out and lighting control of light with brightness corresponding to dimming value 2 → Dimming value 3 Read and control the lighting of the light of the brightness corresponding to the dimming value 3 → Read the dimming value 4 and control the lighting of the light of the brightness corresponding to the dimming value 4 → Read the dimming value 1 and read Lighting control of light with brightness corresponding to dimming value 1 → ...
As described above, the lighting control for sequentially lighting the dimming value 1 to the dimming value 4 can be sequentially performed according to a certain order. The reading order may be constant, for example, dimming value 3 → dimming value 1 → dimming value 4 → dimming value 2 → ....

The lighting device of the first embodiment has a first light emitting mode for performing such lighting control. By doing so, the inspection object can be inspected with appropriate brightness according to the surface condition of the material of the inspection object (roughness, presence / absence and type of covering, etc.) and the type, size and shape of the defect. Can be illuminated.

As shown in FIG. 1, the lighting device also has a conduction state selection unit, but in the first light emitting mode, the control unit constantly controls the continuity of the continuity state selection unit, and the continuity state selection unit , Always in a conductive state.

<Second embodiment>
The lighting device of the second embodiment is
Further, a conduction state selection unit for determining a conduction state for transmitting the drive signal to the light source or a cutoff state for not transmitting the drive signal to the light source is provided.
The storage unit stores a predetermined constant dimming value and stores it.
The control unit reads out the predetermined constant dimming value from the storage unit, and maintains a state in which a lighting signal corresponding to the predetermined constant dimming value is emitted as the drive signal.
The control unit alternately performs lighting control for turning on the light source by making the conduction state selection unit in a conduction state and extinguishing control for turning off the light source by turning off the conduction state selection unit. It has a second emission mode that repeats.

The lighting device of the second embodiment includes a light source, a storage unit, and a control unit, as in the first embodiment (see FIG. 1). The light source emits light of a predetermined brightness. The light emitted from the light source illuminates the object to be inspected. Defects to be inspected include convex defects, streak-like defects, concave defects, dents, and dust, and these defects are present on the surface of the inspection object. These defects can be detected by illuminating the object to be inspected. Since the lighting device of the second embodiment repeats turning on and off with a constant illuminance, it is higher than that of the first embodiment when inspecting a smaller number of types of defects than in the first embodiment. It can be detected with accuracy.

As shown in FIG. 1, the storage unit stores a dimming value of 1.

The control unit reads out the dimming value of 1 stored in the storage unit, generates a drive signal based on the read dimming value, and supplies the drive signal to the light source. In this way, the control unit generates a drive signal based on the dimming value.

Further, the lighting device of the second embodiment has a conduction state selection unit, and the conduction state selection unit determines a conduction state or a cutoff state. In the control unit, the conduction state selection unit is in the conduction state by controlling the continuity with respect to the conduction state selection unit, and the conduction state selection unit is in the interruption state by performing the cutoff control with respect to the conduction state selection unit. The continuity state selection unit is preferably controlled by an external control signal to determine the continuity state or the cutoff state.
By controlling in this way, for example,
Lighting of light with brightness corresponding to the stored dimming value of 1 (conduction state)
→ Off (blocked state)
→ Lighting of light with brightness corresponding to the stored dimming value of 1 (conduction state)
→ Off (blocked state)
→ Lighting of light with brightness corresponding to the stored dimming value of 1 (conduction state)
→ Off (blocked state)
→ ・ ・ ・ ・
Like, it is possible to repeat turning on and off alternately.

The lighting device of the second embodiment has a second light emitting mode in which such lighting and extinguishing are alternately repeated. In the second light emission mode, the lighting signal is continuously emitted, and in the lighting control, the light source is turned on by supplying the continuously emitted lighting signal to the light source. On the other hand, the extinguishing control is a control in which the supply to the light source is cut off and the light source is extinguished by blocking the lighting signal that is continuously emitted.

In the lighting device of the second embodiment, since the state in which the lighting signal is emitted is maintained and the conduction state (lighting state) and the cutoff state (off state) are alternately repeated, the lighting state and the off state are switched at high speed. It is possible to detect defects quickly.

<Third embodiment>
The lighting device of the third embodiment is
The storage unit stores a dimming value for constant lighting, and stores the dimming value.
The control unit has a third light emitting mode in which the dimming value for constant lighting is read out from the storage unit and a lighting signal corresponding to the dimming value for constant lighting is emitted as the drive signal.

The lighting device of the third embodiment includes a light source, a storage unit, and a control unit as in the first embodiment and the second embodiment (see FIG. 1). The light source emits light of a predetermined brightness. The light emitted from the light source illuminates the object to be inspected. Defects to be inspected include convex defects, streak-like defects, concave defects, dents, and dust, and these defects are present on the surface of the inspection object. These defects can be detected by illuminating the object to be inspected. In the lighting device of the third embodiment, since it is constantly lit with a constant illuminance, the illuminance can be stabilized, and when inspecting a smaller number of types of defects than in the first embodiment, the first It is possible to detect with higher accuracy than in the second embodiment, and it is possible to stabilize the accuracy of the inspection by lengthening the illumination time as compared with the second embodiment.

As shown in FIG. 1, the storage unit stores a dimming value of 1.

The control unit reads out the dimming value of 1 stored in the storage unit, generates a drive signal based on the read dimming value, and supplies the drive signal to the light source. By controlling in this way, it is possible to keep the lights on all the time.
The illuminating device of the third embodiment has a third light emitting mode that is constantly lit in this way.

As shown in FIG. 1, the lighting device also has a conduction state selection unit, but in the third light emitting mode, the control unit constantly controls the continuity of the continuity state selection unit, and the continuity state selection unit , Always in a conductive state.

<Fourth embodiment>
The lighting device of the fourth embodiment is
The control unit selects a light emitting mode of any one of the first light emitting mode, the second light emitting mode, and the third light emitting mode, and controls the lighting of the light source.

In the fourth embodiment, the inspector can select which of the first light emitting mode, the second light emitting mode, and the third light emitting mode to be used. ..

<<<<< First Embodiment >>>>>
Hereinafter, the first embodiment of the present invention (hereinafter, referred to as the first embodiment) will be described with reference to the drawings. In addition, in this specification and a drawing, the components with the same reference numerals shall have substantially the same structure or function.

<<< Lighting system configuration >>>
The lighting system according to the first embodiment will be described with reference to FIG. In the lighting system according to the first embodiment, the external device 100 such as a personal computer and the power supply device 200 are connected by a cable or the like, and the power supply device 200 and the lighting device SS are connected by a cable or the like, so that the light in the lighting device SS is connected. It is possible to irradiate and set the irradiation.

<< External device 100 >>
The external device 100 forms a part of an inspection device (inspection device) (not shown) for inspecting an inspection object. The external device 100 can be arbitrarily operated by an inspector (operator, etc.), and outputs a pulse signal (external pulse signal) cycle and voltage which are control cycles (trigger cycles) of the lighting device SS. Is possible. The pulse signal (hereinafter referred to as an external pulse signal) is supplied to the power supply device 200 described later. As will be described later, the external pulse signal is used to control the lighting or extinguishing of the LED.

<< Power supply device 200 >>
The power supply device 200 mainly includes a CPU 201, a ROM 202, a RAM 203, an EEPROM 204, a communication interface 205, a display 206, an operation unit 207, an I / O port 208, and an on / off switch 209, and is an end substrate. A power supply voltage of 35V to 45V is supplied to A, the end substrate B, and each LED substrate. Further, the power supply device 200 outputs a control command, a synchronization signal, and a select signal, and outputs an external pulse signal output from the external device 100. The power supply device 200 may output the external pulse signal output from the external device 100 as it is, or may output it after performing signal processing such as waveform shaping.

<< Lighting device SS >>
The overall configuration of the illuminating device SS will be described later with reference to FIG. 3, but the illuminating device SS mainly includes an end substrate A, an end substrate B, and a plurality of LED substrates (300, 400, 500, 600). There is. In FIG. 2, the LED substrate 500 is omitted. Either the end substrate A or the end substrate B of the lighting device SS is connected to the power supply device 200 by a connector or the like. The control commands transmitted from the CPU 201 of the power supply device 200 are input to the LED board 300, the LED board 400, the LED board 500, and the LED board 600 almost simultaneously via either the end board A or the end board B. The LED is controlled at almost the same timing. Further, the power supply voltage output from the power supply device 200 is input to the LED board 300, the LED board 400, the LED board 500, and the LED board 600 via either the end board A or the end board B. As will be described later, each of the plurality of LED substrates has a similar configuration and is equipped with 26 LEDs. Further, the synchronization signal, the external pulse signal and the select signal output from the power supply device 200 are input to the I / O port of each LED board.

<End board A>
When the end board A is connected to the power supply device 200 by a connector or the like, the end board A is a relay when transmitting a command transmitted from the CPU 201 of the power supply device 200 to the LED board (300, 400, 500, 600) of the lighting device SS. It functions as a board and as a relay board when a command transmitted from the LED board (300, 400, 500, 600) is transmitted to the CPU 201 of the power supply device 200. The end substrate A may be provided with a passive element such as a capacitor. For example, a noise filter or the like can be configured by a passive element or the like.

<LED board (300, 400, 500, 600)>
The LED board mainly includes a CPU, a ROM, a RAM, an EEPROM, a communication interface, a DAC-a, a DAC-b, an LED-a, an LED-b, and an I / O port.

26 LEDs are mounted on the LED board, and LED-a is a general term for a plurality of LEDs (13 in the first embodiment) on the left half of the plurality of LEDs mounted on the LED board. LED-b is a general term for a plurality of LEDs (13 in the first embodiment) on the right half of the plurality of LEDs mounted on the LED substrate.

The DAC-a is a D / A converter, which is used to control the LED-a and includes a circuit for converting a digital signal into an analog signal. With this DAC-a, as will be described later, the digital signal output from the CPU can be converted into an analog signal. The digital signal output from the CPU indicates a dimming value, and the dimming value is converted into a voltage value of an analog signal by DAC-a. The DAC-b is a D / A converter, which is used to control the LED-b and includes a circuit for converting a digital signal into an analog signal. With this DAC-b, as will be described later, the digital signal output from the CPU can be converted into an analog signal. The digital signal output from the CPU indicates a dimming value, and the dimming value is converted into a voltage value of an analog signal by DAC-b.

The number of LED substrates provided in the lighting device SS can be appropriately changed according to the width (length, etc.) of the inspection object and the length of the lighting device SS required by the inspector.

<End board B>
When the end board B is connected to the power supply device 200 by a connector or the like, it is a relay when transmitting a command transmitted from the CPU 201 of the power supply device 200 to the LED board (300, 400, 500, 600) of the lighting device SS. It functions as a board and as a relay board when a command transmitted from the LED board (300, 400, 500, 600) is transmitted to the CPU 201 of the power supply device 200. The end substrate B may be provided with a passive element such as a capacitor. For example, a noise filter or the like can be configured by a passive element or the like.

<<< Overall configuration of lighting device SS >>>
The overall configuration of the lighting device SS will be described with reference to FIG. The lighting device SS mainly includes a housing 350, a plurality of LED substrates, a plurality of LEDs, a rod lens 360, and a diffuser lens 370. Specifically, the lighting device SS includes four LED substrates, and 26 LEDs are mounted on one LED substrate.
<Case 350>
The housing 350 houses the parts of the lighting device SS and defines an approximate outer shape. The housing 350 is made of aluminum and is formed by extrusion molding.

The housing 350 has a long groove-like shape. The housing 350 has a bottom surface portion 351 and two side surface portions (352, 353) facing each other with the bottom surface portion 351 interposed therebetween. The bottom surface portion 351 and the two side surface portions have a long and flat shape. The two side surface portions have the same size and shape, are erected along the height direction with respect to the bottom surface portion 351 and are arranged so as to be parallel to each other.

Each of the two side surface portions has a top surface portion (354, 355) formed parallel to the bottom surface portion 351 at the uppermost portion farthest from the bottom surface portion 351.

<LED board>
An LED is mounted on each of the LED boards, and the LED board supplies a voltage for emitting light to the LED, and the CPU or the like controls the lighting and extinguishing of the LED.

The LED substrate is made of an aluminum substrate and has a thin rectangular shape. Twenty-six LEDs are mounted on each of the LED substrates. The 26 LEDs are arranged linearly along the longitudinal direction of the LED substrate.

The LED substrate is attached so that the LED faces upward (+ Z direction). A plurality of LED substrates are mounted on the housing 350. The plurality of LED substrates are arranged along the longitudinal direction (Y direction) of the housing 350 along the virtual straight line L1 arranged so that the LED substrates adjacent to each other are in close contact with each other.

<LED>
The LED is a light source for emitting light from the lighting device SS. As described above, 26 LEDs are mounted on each LED substrate. The 26 LEDs on each LED substrate emit light in the + Z direction (upward).

<Rod lens 360>
The rod lens 360 collects the light emitted from the LED. The rod lens 360 is made of acrylic and has an elongated cylindrical shape.

The rod lens 360 is arranged above the LED and so that the virtual straight line L1 for arranging the LED and the central axis L2 of the rod lens 360 are parallel to each other.

The rod lens 360 is sandwiched from the left and right by lens stays (not shown) and fixed to the housing 350 via four lens stays.

<Diffuser lens 370>
The diffuser lens 370 is a diffuser plate for diffusing the light transmitted through the rod lens 360.

<<< Circuit diagram >>>
FIG. 4 is a block diagram showing an outline of the circuit. Each LED board includes a CPU, a DAC (DAC-a, DAC-b), an LED group (LED-a, LED-b), a photodiode (PD), and a thermista (TH1, TH2, TH3). , A / D converter, voltage-current conversion circuit, and current amplification circuit are mounted. The current amplifier circuit has a current generator.

The power supply device 200 and each LED board are connected via the end board A or the end board B, and the external pulse signal output from the power supply device 200 is input to each LED board. In each LED board, the external pulse signal is supplied to both the CPU (301, 401, 501, 601) and the on / off switch (311, 411, 511, 611). The CPU (301, 401, 501, 601) turns on the LED when the external pulse signal is at a high level in the high-speed dimming mode described later, and turns off the LED when the external pulse signal is at a low level. On / off switches (analog switches) 311, 411, 511, and 611 are provided on each LED board, and in the high-speed pulse mode described later, when the external pulse signal is at a high level, the on / off switch 311 and the like are in a conductive state. Then, the voltage signal converted by the DAC (DAC-a, DAC-b) is input to the voltage-current conversion circuit, and when the external pulse signal is at a low level, the on / off switch 311 and the like are in a non-conducting state (disconnection state). , The voltage signal converted by the DAC (DAC-a, DAC-b) is not input to the voltage-current conversion circuit.

Further, the synchronization signal and the select signal output from the power supply device 200 are input to the CPUs 301, 401, 501, and 601 of each LED board.

The control command transmitted from the CPU 201 of the power supply device 200 is input to each of the LED boards via the end board A or the end board B. After the CPU of the LED board and the DAC are connected and a control command is input to the CPU of the LED board (not shown), the CPU of the LED board outputs data related to the dimming value to the DAC and adjusts by the DAC. The digital signal related to the light value is converted into an analog signal. The control command includes a dimming value indicating illuminance, a lighting command for turning on the LED, a turning-off command for turning off the LED, and the like.

The DAC-a sets the dimming value (digital signal) for controlling the left half LED-a (13) of the 26 LEDs mounted on each LED board to the voltage value (analog signal). The DAC-b converts the dimming value (digital signal) for controlling the right half LED-b (13) of the 26 LEDs mounted on each LED board into a voltage value. Convert to (analog signal).

The analog signal (voltage signal) output from the DAC (DAC-a, DAC-b) is input to the voltage-current conversion circuit and converted into a current. The voltage-current conversion circuit is composed of, for example, an operational amplifier (operational amplifier) or a resistor, and converts it into a current signal at an amplification factor determined by a resistance value. The DAC converts it into a current corresponding to the voltage value of the analog signal corresponding to the dimming value. Further, the current output from the voltage-current conversion circuit is input to the current amplification circuit and amplified. The current amplification circuit is composed of transistors, FETs, and the like, and amplifies the current output from the voltage-current conversion circuit at a desired amplification factor. The current amplified by the current amplification circuit is input to the LED group (LED-a (13 pieces) or LED-b (13 pieces)) as a drive current. The LED group (LED-a (13 pieces) or LED-b (13 pieces)) emits light with an illuminance corresponding to the drive current.

The first end of the LED group is connected to the power supply device 200. The second end of the LED group is connected to the current amplification circuit, and as described above, the drive current is supplied to the LED group from the current amplification circuit. Further, the first end of the LED group is connected to the power supply voltage monitoring circuit.

An A / D converter is provided on the LED substrate. The A / D converter converts an analog signal into a digital signal. The A / D converter is connected to the CPU of the LED substrate. The digital signal converted by the A / D converter is input to the CPU. Power supply voltage monitoring circuit, photodiode PD (detection of illuminance of light emitted from LED group), thermistor TH1 (temperature detection of LED group (LED-a) in the left half), thermistor TH2 (LED in the right half) The temperature detection of the group (LED-b)) is connected to the A / D converter. The power supply voltage monitoring circuit is composed of a resistor having a large resistance value, etc., and converts the current value of the drive current supplied to the LED group into a voltage value included in a predetermined voltage range, and converts the A / D converter. Output to. Thereby, it can be determined whether or not the power supply voltage output from the power supply device 200 is appropriate. The photodiode PD can determine whether or not the illuminance of the light emitted from the LED group is appropriate. The thermistor TH1 and thermistor TH2 can determine whether or not the temperature of the LED group is appropriate.

Further, the voltage / current exchange circuit is connected to the CPU of the LED board, and can detect an open error or the like.

The thermistor TH3 (temperature detection of the LED substrate) is connected to the CPU of the LED substrate.

<<< Lighting mode >>>
FIG. 5A is a timing chart for each lighting mode in the lighting device SS. There are three types of illumination modes: normal mode, high-speed dimming mode, and high-speed pulse mode.

<Normal mode>
FIG. 5A is a timing chart showing a normal mode. The horizontal axis of the time chart shown in FIG. 5A is the time (time) T, and the vertical axis is the illuminance of the light emitted from the LED. In the example shown in FIG. 5A, the illuminance is lit at a constant illuminance between the minimum MIN value and the maximum illuminance value MAX. In the normal mode, the inspector can set the dimming value corresponding to the illuminance desired by the inspector by operating the operation unit 207 of the power supply device 200, and corresponds to the set dimming value. This is a mode in which the LED of the lighting device SS is constantly output at a constant illuminance (constant lighting mode). In the normal mode, the LED lighting and extinguishing control and the illuminance control at the time of lighting are performed by a command transmitted from the CPU 201 of the power supply device 200.

<High-speed dimming mode>
FIG. 5B is a timing chart showing a high-speed dimming mode. Specifically, FIG. 5B shows a time chart of the illuminance, the external pulse signal, the synchronization signal, the select signal 1 and the select signal 2. The vertical axis of the time chart of the external pulse signal, the synchronization signal, the select signal 1 and the select signal 2 is the voltage. In the high-speed dimming mode, the inspector can register (set) dimming values corresponding to a plurality of illuminances by operating the operation unit 207 of the power supply device 200 in advance, and a plurality of registered dimming values can be registered. In this mode, the dimming value is read out in the order of registration for each input of an external pulse signal (for example, 5 μs) to change the illuminance of the LED. The external pulse signal repeats a low level (LOW) state and a high level (HIGH) state. When the external pulse signal is at a high level (HIGH), the illuminance of the LED is changed, and the LED is controlled to continue lighting with the illuminance of the same dimming value until the next high level (HIGH) is input.

The plurality of illuminances can be specified according to the combination of the inputs of the select signal 1 and the select signal 2 (that is, 2 bits (4 states in total)). The select signal 1 and the select signal 2 take a value of either 0 (low level (LOW)) or 1 (high level (HIGH)). In this example, the relationship between the combination of the select signal 1 and the select signal 2 and the registration number is
(1) "0"-"0": Registration number 0 (dimming value A)
(2) "1"-"0": Registration number 1 (dimming value B)
(3) "0"-"1": Registration number 2 (dimming value C)
(4) "1"-"1": Registration number 3 (dimming value D)
Is. The dimming value A is registered in the registration number 0, the dimming value B is registered in the registration number 1, and the dimming value C is registered in the registration number 2 by using the command transmitted from the CPU 201 of the power supply device 200. Can be registered, and the dimming value D can be registered in the EEPROM with the registration number 3.

By doing so, when the combination of the select signal 1 and the select signal 2 is "0"-"0", the dimming value A of the registration number 0 is read from the EEPROM, and the select signal 1 and the select signal 2 are read. When the combination of 2 is "1"-"0", the dimming value B of the registration number 1 is read from the EEPROM, and the combination of the select signal 1 and the select signal 2 is "0"-"1". At one time, the dimming value C of the registration number 2 is read from the EEPROM, and when the combination of the select signal 1 and the select signal 2 is "1"-"1", the dimming value D of the registration number 3 is the EEPROM. Read from.

The combination of select signal 1 and select signal 2 can be changed from "0"-"0"-> "1"-"0"-> "0"-"1"-> "1"-"1"-> "0"-"0". → Registration number 0 → Registration number 1 → Registration number 2 → Registration number 3 → Registration number 0 → Registration number by repeatedly inputting from CPU201 of the power supply device 200 as in “1”-“0” → ... Repeatedly read from the EEPROM in a predetermined order (illuminance cycle) as in 1 ..., dimming value A → dimming value B → dimming value C → dimming value D → dimming value A → dimming value It is possible to specify a dimming value as in B ... and emit light in a predetermined order (illuminance cycle).

The select signal 1 and the select signal 2 are supplied to all the LED substrates at the same time, and are controlled so that light having the same illuminance is emitted from all the LED substrates at the same time.

The number of registrations can be changed depending on the number of select signals, and if there are three select signals (that is, three bits (a total of eight states)), a dimming value can be set for each of the eight registration numbers. It is possible. It is also possible to register the same illuminance (dimming value) in a plurality of registration numbers.

As described above, the external pulse signal repeats the low level (LOW) state and the high level (HIGH) state, and changes the illuminance of the LED when the external pulse signal is high level (HIGH). Control. When the external pulse signal reaches a high level (HIGH) state, the dimming value corresponding to the registration number indicated by the select signal 1 and the select signal 2 is read from the EEPROM, and the LED is turned on with the illuminance corresponding to the dimming value. When the external pulse signal is low level (LOW), the LED output is controlled to continue at the changed illuminance.

The synchronization signal is a signal (reset signal) used to output the initial registration number (here, registration number 0). The synchronization signal repeats a low level (LOW) state and a high level (HIGH) state. When the synchronization signal reaches a high level (HIGH), the registration number is forcibly reset to 0.

In the first embodiment, the synchronization signals are simultaneously input to the plurality of LED substrates, and the select signal 1 and the select signal 2 simultaneously emit light having the same illuminance from all the LED substrates. However, it is assumed that some LED boards cannot accurately receive the select signal 1 and the select signal 2 (so-called omission), so that all the LED boards cannot emit light of the same illuminance. In such a case, the illuminance of the LED becomes uneven, and it becomes difficult to accurately illuminate the inspection object. Therefore, as described above, by supplying the synchronization signal to all the LED boards at the same time, the registration number 0 is forcibly returned to all the LED boards, so that the illuminance cycle is once reset and all the LEDs are used. The illuminance of the light emitted from the LED substrate can be synchronized.

<High-speed pulse mode>
FIG. 5C is a timing chart showing a high-speed pulse mode. The horizontal axis of the time chart shown in FIG. 5 (c) is the time (time) T, and the vertical axis is the illuminance of the light emitted from the LED. In the example shown in FIG. 5C, lighting and extinguishing are repeated at a constant illuminance between the minimum value MIN and the maximum value MAX of the illuminance. The vertical axis of the time chart of the external pulse signal is voltage.

In the high-speed pulse mode, the inspector can operate the operation unit 207 of the power supply device 200 in advance to register (set) the dimming value of 1 corresponding to the illuminance of 1 in the EEPROM in advance. When the high-speed pulse mode is set, the dimming value of 1 registered in advance is read from the EEPROM, and the DAC (DAC-a, DAC-b) is used to analog the voltage value corresponding to the dimming value of 1. The state in which the signal (voltage signal) is output is maintained. As described above, the external pulse signal is a signal in which a low level (LOW) state and a high level (HIGH) state are repeated in a predetermined period (for example, 5 μs). As described above, each LED board is provided with an on / off switch (analog switch) 311 or the like, and an external pulse signal is input to the on / off switch 311 or the like of the LED board to control the operation of the on / off switch 311 or the like. To do.

When the external pulse signal is in the low level (LOW) state, the on / off switch 311 or the like is turned off, and the analog signal (voltage signal) output from the DAC (DAC-a, DAC-b) is in a non-conducting state (voltage signal). (Blocked state). At this time, the analog signal output from the DAC (DAC-a, DAC-b) is not supplied to the voltage-current conversion circuit, the drive current is not supplied to the LED, and the LED is turned off.

On the other hand, when the external pulse signal is in the high level (HIGH) state, the on / off switch 311 or the like is turned on to conduct the analog signal (voltage signal) output from the DAC (DAC-a, DAC-b). Set to (blocked state). At this time, the analog signal output from the DAC (DAC-a, DAC-b) is supplied to the voltage-current conversion circuit, the current converted by the voltage-current conversion circuit is supplied to the LED as a drive current, and the LED is It is in a state of being lit with an illuminance corresponding to the dimming value of 1.

In this way, in the high-speed pulse mode, the dimming value of 1 stored in the EEPROM in advance is read out, and the voltage signal corresponding to the dimming value of 1 is transmitted from the DAC (DAC-a, DAC-b). It keeps being output. By driving the on / off switch 311 or the like with an external pulse signal, the analog signal (voltage signal) output from the DAC (DAC-a, DAC-b) can be made conductive or non-conducting to turn on or off the LED. it can. While maintaining the state in which the analog signal (voltage signal) from the DAC (DAC-a, DAC-b) is output, the on / off control is controlled only by driving the on / off switch 311 or the like, so that the on / off can be turned on at high speed. It can be switched.

<<< Usage information >>>
FIG. 6 is a list of commands, various signals, various information of dimming values, etc. used for controlling the output of the LED of each mode.

<Commands, signals, dimming values used in normal mode>
As described above, the normal mode is a mode (constant lighting mode) in which light having an illuminance corresponding to the dimming value stored in the EEPROM is always output from the LED of the lighting device SS.

As shown in FIG. 6, in the normal mode, the LED of the lighting device SS is controlled only by the command transmitted from the CPU 201 of the power supply device 200. The command used in the normal mode includes a dimming value corresponding to the illuminance of the light emitted from the LED, and the dimming value included in the command is stored in the EEPROM. Specifically, the inspector can set the illuminance by operating the operation unit 207 of the power supply device 200, and the command regarding the set illuminance is issued from the CPU 201 of the power supply device 200 to each LED of the lighting device SS. It is transmitted to the CPU of the board, and the CPU of each LED board stores the illuminance of the LED in each EEPROM in response to the received command. The dimming value is read from the EEPROM, and the light of the illuminance corresponding to the dimming value is emitted from the LED by the driving current of the LED corresponding to the dimming value.

Further, the command used in the normal mode includes a command for turning on or off the LED. In the normal mode, the lighting or extinguishing of the LED is controlled without using a synchronization signal, an external pulse signal, or a select signal.

<Commands, signals, and dimming values used in high-speed dimming mode>
In the high-speed dimming mode, a plurality of illuminances output from the LED of the lighting device SS are stored in advance in the EEPROM for each registration number by using a command transmitted from the CPU 201 of the power supply device 200, and a plurality of registered dimming modes are performed. In this mode, the light values are read out in a certain order and the light having the illuminance corresponding to the dimming value is output from the LED of the lighting device SS.

As shown in FIG. 6, in the high-speed dimming mode, the LED is controlled by using a command, a synchronization signal, an external pulse signal, and a select signal transmitted from the CPU 201 of the power supply device 200. The command used in the high-speed dimming mode includes a plurality of dimming values corresponding to a plurality of illuminances, and the plurality of dimming values included in the command are stored in EEPROM. Specifically, when the inspector operates the operation unit 207 of the power supply device 200, a command regarding the illuminance is transmitted from the CPU 201 of the power supply device 200 to the CPU of each LED board of the lighting device SS for each registration number to be registered. The CPU of each LED board stores the illuminance of each registration number in each EEPROM in advance according to the received command. As shown in FIG. 6, in the high-speed dimming mode, a synchronization signal, an external pulse signal, and a select signal are used.

<Commands, signals, dimming values used in high-speed pulse mode>
In the high-speed pulse mode, the illuminance output by the LED of the lighting device SS is stored in the EEPROM in advance at the registration number of 1 by using the command transmitted from the CPU 201 of the power supply device 200, and the registered dimming value is read out. It is a mode that repeats turning on and off.

As shown in FIG. 6, in the high-speed pulse mode, the LED is controlled by using a command and an external pulse signal transmitted from the CPU 201 of the power supply device 200. The command used in the high-speed pulse mode includes 1 dimming value corresponding to 1 illuminance, and 1 dimming value included in the command is stored in EEPROM. Specifically, when the inspector operates the operation unit 207 of the power supply device 200, a command regarding the illuminance of the registration number is transmitted from the CPU 201 of the power supply device 200 to the CPU of each LED board of the lighting device SS, and each LED board. The CPU of the above stores the illuminance of the registration number in each EEPROM in advance according to the received command.

<<< Control processing of power supply device 200 >>>
FIG. 7 is a flowchart of the power supply device control process in the power supply device 200. First, the CPU 201 of the power supply device 200 determines in step 1002 whether or not to initialize.

In the case of Yes in step 1002, in step 1004, the CPU 201 of the power supply device 200 performs the initialization process. If No in step 1002, the process proceeds to step 1006.

In the initialization process (step 1004), the CPU 201 of the power supply device 200 initializes the stored information of the RAM 203. Specifically, the currently set menu settings such as the lighting mode are initialized (returned to the default), and the initialization command is transmitted to the CPU of each LED board of the lighting device SS.

Next, in step 1006, the CPU 201 of the power supply device 200 determines whether or not the menu operation has been performed by the inspector.

In the case of Yes in step 1006, in step 1008, the CPU 201 of the power supply device 200 performs the menu setting process. If No in step 1006, the process proceeds to step 1010.

In the menu setting process, the CPU 201 of the power supply device 200 stores the operation result of the power supply device 200 of the inspector in the RAM 203. Specifically, the operation by the inspector includes changing the illuminance, changing the lighting mode, and the like, and the operation results are stored in the RAM 203. When a menu operation such as inspection stop is performed by the operation of the power supply device 200, a command (inspection stop command or the like) indicating that fact is transmitted to the CPU of each LED board in the process.

When the inspection stop operation is performed by the operation of the external device 100 and the inspection stop command transmitted from the external device 100 is received, the inspection stop command is transmitted to the CPU of each LED board of the lighting device SS in the process. ..

Next, in step 1010, the CPU 201 of the power supply device 200 determines whether or not the illuminance has been changed. By performing this operation, the illuminance of the light emitted from the LED can be changed.

In the case of Yes in step 1010, in step 1012, the CPU 201 of the power supply device 200 transmits an illuminance command to the CPU of each LED substrate of the lighting device SS. If No in step 1010, the process proceeds to step 1014.

Next, in step 1014, the CPU 201 of the power supply device 200 determines whether or not the illumination mode has been changed.

In the case of Yes in step 1014, in step 1016, the CPU 201 of the power supply device 200 indicates the lighting mode (normal mode, high-speed dimming mode, high-speed pulse mode) after the change to the CPU of each LED substrate of the lighting device SS. Send a command. If No in step 1014, the process proceeds to step 1022. By this process, light can be emitted from the LED in any of the normal mode, the high-speed dimming mode, and the high-speed pulse mode.

Next, in step 1022, whether or not the CPU 201 of the power supply device 200 is in the PWM (Pulse Width Modulation) mode, that is, in the high-speed dimming mode or the high-speed pulse mode in which the output control of the LED is performed using an external pulse signal. Determine if it exists.

In the case of Yes in step 1022, in step 1024, the CPU 201 of the power supply device 200 turns on the on / off switch 209 (see FIG. 2) in the power supply device 200 in order to enable pulse control, and proceeds to the process of step 1025. To do.

If No in step 1022, in step 1024-1, the CPU 201 of the power supply device 200 turns off the on / off switch 209 in the power supply device 200 in order to make pulse control impossible, and proceeds to the process of step 1025.

The on / off switch 209 in the power supply device 200 described above is a switch for selecting whether or not to output an external pulse signal supplied from the external device 100 to the power supply device 200 from the power supply device 200. When the on / off switch 209 of the power supply device 200 is turned on, an external pulse signal is output from the power supply device 200, and when the on / off switch 209 of the power supply device 200 is turned off, the external pulse signal is not output from the power supply device 200. The PWM mode (high-speed dimming mode or high-speed pulse mode) is a mode in which the illuminance of the LED is changed in synchronization with the external pulse signal output from the power supply device 200.

Next, in step 1025, the CPU 201 of the power supply device 200 performs a command reception process, and proceeds to the process of step 1026.

In the command reception process, the CPU 201 of the power supply device 200 receives a command transmitted from the CPU of each LED board, and updates the stored information of the RAM 203 and the EEPROM 204 based on the received command.

Next, in step 1026, the CPU 201 of the power supply device 200 performs an error check process.

In the error check process (step 1026), the CPU 201 of the power supply device 200 performs a communication check with the CPU of each LED board of the lighting device SS, a communication abnormality (power supply abnormality) check in the power supply device 200, and the like.

Next, in step 1028, the CPU 201 of the power supply device 200 performs the display display process, and when the process of step 1028 is completed, the process returns to the process of step 1006.

In the display display process, the CPU 201 of the power supply device 200 performs a process for displaying various information on the display 206. Specifically, the lighting mode, illuminance, and the like are displayed based on the contents of the menu setting process, and the LED substrate temperature and errors (LED temperature abnormality, open error, communication abnormality, etc.) are displayed.

<<< Control processing of lighting device SS >>>
<< Lighting control processing >>
8 and 9 are flowcharts of lighting control processing in the lighting device SS. First, in step 2001, the CPUs (301, 401, 601 and the like) mounted on the LED boards (300, 400, 600 and the like) of the lighting device SS perform the initialization command reception process.

Next, in step 2002, the CPU of each LED board determines whether or not to initialize, in other words, whether or not the initialization command is received by the initialization command reception process.

In the case of Yes in step 2002, in step 2004, the CPU of each LED board performs the initialization process. If No in step 2002, the process proceeds to step 2005.

In the initialization process (step 2004), the CPU of each LED substrate initializes the stored information of the RAM (303, 403, 603, etc.). Specifically, the counts related to the stored and registered illuminance, the menu setting information, and the like are initialized.

Next, in step 2005, the CPU of each LED board performs a command reception process (command reception process other than the initialization command), and proceeds to the process of step 2006.

In the command reception process, the CPU of each LED board receives the command information transmitted from the CPU 201 of the power supply device 200. When the inspection stop operation is performed by the operation of the external device 100 or the power supply device 200, the inspection stop command is transmitted from the external device 100 or the power supply device 200, and the CPU of each LED board sends the transmitted inspection stop command. Is received, the process of stopping the inspection is performed.

Next, in step 2006, the CPU of each LED substrate determines whether or not the current illumination mode is the high-speed pulse mode.

If Yes in step 2006, the process proceeds to step 2300. If No in step 2006, the process proceeds to step 2006-1.

Next, in step 2006-1, the CPU of each LED substrate turns on the on / off switch 311 and the like, that is, sets the conduction state selection unit to the conduction state, and proceeds to the process of step 2007.

Next, in step 2007, the CPU of each LED substrate determines whether or not the illuminance command has been received.

In the case of Yes in step 2007, in step 2008, the CPU of each LED substrate stores the illuminance in the illuminance storage table of the EEPROM based on the illuminance command.

For example, if the illuminance command is a command indicating the illuminance of the registration number 0 of the high-speed dimming mode, the CPU of each LED board sets the illuminance indicated by the illuminance command to the registration number 0 of the high-speed dimming mode storage area of the EEPROM. Store (register) the corresponding dimming value.

If the command indicates the illuminance of the registration number 1, the dimming value corresponding to the illuminance indicated by the illuminance command is stored (registered) in the registration number 1 of the high-speed dimming mode storage area of the EEPROM.

If the command indicates the illuminance of the registration number 2, the dimming value corresponding to the illuminance indicated by the illuminance command is stored (registered) in the registration number 2 of the high-speed dimming mode storage area of the EEPROM.

If the command indicates the illuminance of the registration number 3, the dimming value corresponding to the illuminance indicated by the illuminance command is stored (registered) in the registration number 3 of the high-speed dimming mode storage area of the EEPROM (see FIG. 14A). ).

If the illuminance command is a command indicating the illuminance in the high-speed pulse mode, the dimming value corresponding to the illuminance indicated by the illuminance command is stored (registered) in the registration number 0 of the high-speed pulse mode storage area of the EEPROM (FIG. 14 (FIG. 14). b) See).

If the illuminance command is a command indicating the illuminance in the normal mode, the dimming value corresponding to the illuminance indicated by the illuminance command is stored in the storage area of the normal mode storage area of the EEPROM (see FIG. 14C).

Needless to say, the illuminance command indicating the illuminance of the other illumination modes also stores the dimming value corresponding to the illuminance.

If No in step 2007, the process proceeds to step 2010.

Next, in step 2010, the CPU of each LED substrate determines whether or not the illumination mode command has been received.

In the case of Yes in step 2010, in step 2012, the CPU of each LED substrate performs the illumination mode switching process. If No in step 2010, the process proceeds to step 2017.

In the illumination mode switching process, the CPU of each LED board changes the illumination mode to the high-speed dimming mode if the illumination mode command is a command indicating the high-speed dimming mode, and the illumination mode command is a command indicating the high-speed pulse mode. If so, change the illumination mode to high-speed pulse mode, and if the illumination mode command is a command indicating normal mode, change the illumination mode to normal mode.

Next, in step 2017, the CPU of each LED substrate determines whether or not it is currently inspecting.

If No in step 2017, the process proceeds to step 2005.

In the case of Yes in step 2017, in step 2018, the CPU of each LED substrate determines whether or not the current illumination mode setting is the high-speed dimming mode.

In the case of Yes in step 2018, in step 2200, the CPU of each LED substrate performs the high-speed dimming mode output process described later.

If No in step 2018, it is determined in step 2020 whether or not the current illumination mode setting is the high-speed pulse mode.

In the case of Yes in step 2020, in step 2300, the CPU of each LED substrate performs the high-speed pulse mode output process described later.

If No in step 2020, in step 2400, the CPU of each LED board performs the normal mode output process described later.

When the processes of step 2200, step 2300, and step 2400 are completed, the process proceeds to step 2500.

Next, in step 2500, the CPU of each LED board performs an error check process described later.

Next, in step 2024, the CPU of each LED board finishes the inspection for ending the inspection transmitted by whether or not the inspection is completed, that is, the operation of the external device 100 or the power supply device 200 is performed. Determine if a command has been received.

In the case of Yes in step 2024, in step 2026, the CPU of each LED substrate performs the inspection end process and returns to the process of step 2005.

In the inspection end process, the CPU of each LED board turns off the LED when the LED is lit, and the inspection is completed.

If No in step 2024, the process returns to step 2005.

By executing the processes of steps S2017 to S2400 described above, light can be emitted in any one of the high-speed dimming mode, the high-speed pulse mode, and the normal mode, and the surface condition (coarseness) of the material of the inspection object can be emitted. The inspection target can be illuminated in a desired lighting mode according to the presence / absence and type of the sheath covering, the type of defect, and the like.

<High-speed dimming mode output processing>
FIG. 10 is a flowchart of the high-speed dimming mode output process in step 2200. First, in step 2202, the CPU of each LED board determines whether or not there is an input of an external pulse signal. Specifically, it is determined whether or not the external pulse signal is ON (HIGH level).

If Yes in step 2202 (ie, if the external pulse signal is on (HIGH level)), the process proceeds to step 2204. If No in step 2202, that is, if there is no input of an external pulse signal (that is, if the external pulse signal is off (LOW level)), the process proceeds to the next process.

Next, in step 2204, the CPU of each LED board determines whether or not there is an input of a synchronization signal. Specifically, it is determined whether or not the synchronization signal is ON (HIGH level).

In the case of Yes in step 2204 (when the synchronization signal is ON (HIGH level)), in step 2206, the CPU of each LED board refers to the high-speed dimming mode storage area of the illuminance storage table and refers to the high-speed dimming mode. Output with the illuminance of registration number 0 of.

If No in step 2204 (when the synchronization signal is off (LOW level)), in step 2208, the CPU of each LED board determines whether or not the select signal 1 is input. Specifically, it is determined whether or not the select signal 1 is off (LOW level).

If Yes in step 2208 (when the select signal 1 is off (LOW level)), in step 2210, the CPU of each LED board determines whether or not the select signal 2 is input. Specifically, it is determined whether or not the select signal 2 is off (LOW level).

In the case of Yes in step 2210 (when select signal 2 is off (LOW level)), that is, in the case of select signal 1: 0 (no input) and select signal 2: 0 (no input), in step 2212, respectively. The CPU of the LED substrate refers to the high-speed dimming mode storage area of the illuminance storage table and outputs the illuminance at the registration number 0 of the high-speed dimming mode.

If No in step 2210 (when select signal 2 is on (HIGH level)), that is, when select signal 1: 0 (no input) and select signal 2: 1 (with input), in step 2214, each The CPU of the LED substrate refers to the high-speed dimming mode storage area of the illuminance storage table and outputs the illuminance at the registration number 2 of the high-speed dimming mode.

On the other hand, if No in step 2208 (when the select signal 1 is ON (HIGH level)), in step 2216, the CPU of each LED board determines whether or not the select signal 2 is input. Specifically, it is determined whether or not the select signal 2 is off (LOW level).

In the case of Yes in step 2216 (when select signal 2 is off (LOW level)), that is, in the case of select signal 1: 1 (with input) and select signal 2: 0 (without input), in step 2218, respectively. The CPU of the LED board refers to the high-speed dimming mode storage area of the illuminance storage table and outputs the illuminance with the registration number 1 of the high-speed dimming mode.

If No in step 2216 (when select signal 2 is on (HIGH level)), that is, in the case of select signal 1: 1 (with input) and select signal 2: 1 (with input), in step 2220, respectively. The CPU of the LED board refers to the high-speed dimming mode storage area of the illuminance storage table and outputs the illuminance at the registration number 3 of the high-speed dimming mode.

When the processes of step 2206, step 2212, step 2214, step 2218, and step 2220 are completed, the caller returns to the caller.

By executing the process of steps S2202 to S2220 described above, as shown in FIG. 5B, the light having the illuminance of the registration number can be emitted in a certain order (registered order).

<High-speed pulse mode output processing>
FIG. 11 is a flowchart of the high-speed pulse mode output process in step 2300. In the high-speed pulse mode, in step 2302, the CPU of each LED substrate refers to the normal mode storage area of the illuminance storage table, outputs the illuminance with the registration number 0 of the high-speed pulse mode, and returns to the caller.

In the high-speed pulse mode, the CPU of each LED substrate controls to continue outputting at the illuminance of the registration number 0 of the high-speed pulse mode. However, as described in FIG. 4, in the high-speed pulse mode, the power supply is supplied from the power supply device 200. Since the on / off switch (311, 411, 511, 611) of each LED board is directly switched on and off by the external pulse signal, the on / off switch (311, 411, 511, 611) is used when the external pulse signal is at a high level. Turns on (conducting state) and the LED lights up, and when the external pulse signal is at a low level, the on / off switch (311, 411, 511, 611) turns off (blocking state) and the LED turns off. That is, as shown in FIG. 5C, it is possible to emit light having a constant illuminance when it is turned on while repeating turning on and off.

<Normal mode output processing>
FIG. 12 is a flowchart of the normal mode output process of step 2400. In the normal mode output process, in step 2402, the CPU of each LED board refers to the normal mode storage area of the illuminance storage table, outputs the illuminance in the normal mode, and returns to the caller.

By executing the process of step S2402 described above, as shown in FIG. 5A, it is possible to continuously emit light having a constant illuminance (constant lighting).

<Error check processing>
FIG. 13 is a flowchart of the error check process in step 2500. First, in step 2502, the CPU of each LED board transmits an LED temperature command indicating the LED temperature detected by the thermistor to the CPU of the next LED board in order to transmit the LED temperature command to the CPU 201 of the power supply device 200.

Next, in step 2504, the CPU of each LED substrate determines whether or not the LED temperature is equal to or higher than the reference value.

In the case of Yes in step 2504, in step 2506, the CPU of each LED substrate performs the LED illuminance lowering process. Specifically, the LED is forcibly turned off. By operating the menu of the power supply device 200 to turn on the LED, the LED is turned on again.

Next, in step 2508, the CPU of each LED board transmits the LED temperature error information (command) to the CPU 201 of the next LED board in order to transmit the LED temperature error information (command) to the CPU 201 of the power supply device 200.

If No in step 2504, the process proceeds to step 2510.

Next, in step 2510, the CPU of each LED substrate determines whether or not an open error has occurred.

Specifically, the CPU of each LED substrate determines whether or not a defect in the current circuit for supplying a current to the LED, for example, a disconnection of the circuit has occurred.

In the case of Yes in step 2510, in step 2512, the CPU of each LED board transmits the open error information (command) to the CPU 201 of the next LED board in order to transmit the open error information (command) to the CPU 201 of the power supply device 200.

Next, in step 2514, the CPU of each LED board transmits the LED board temperature information (command) to the CPU 201 of the next LED board in order to transmit it to the CPU 201 of the power supply device 200.

Next, in step 2516, the CPU of each LED substrate determines whether or not an LED substrate temperature error has occurred.

In the case of Yes in step 2516, in step 2518, the CPU of each LED board transmits the LED board temperature error information (command) to the CPU 201 of the power supply device 200 to the CPU of the next LED board, and to the caller. Return. Even if No in step 2516, the caller is returned.

The error determination performed in the error check process is not limited to these.

By checking the various errors described above, it is possible to maintain a good state and illuminate the inspection object with an appropriate light emitting state.

<< Illuminance setting table >>
FIG. 14 is an example of a configuration diagram of an illuminance storage table.

<High-speed dimming mode storage area>
FIG. 14A is a configuration diagram of a high-speed dimming mode storage area. As described above, in the high-speed dimming mode, it is possible to register the dimming value corresponding to the illuminance based on the command transmitted from the CPU 201 of the power supply device 200, and in the first embodiment, the registration number is 0. Dimming value 3075 with 100% illuminance, dimming value 769 with 25% illuminance as registration number 1, 1445 dimming value with 47% illuminance as registration number 2, and 72% illuminance with registration number 3. The dimming value 2214, which is, is registered.

That is, as described with reference to FIG. 5, in the high-speed dimming mode, the LED is controlled to emit light in the order of registration number 0 → registration number 1 → registration number 2 → registration number 3 → ... The light is emitted in the order of 100% → illuminance 25% → illuminance 47% → illuminance 72% → ...

<High-speed pulse mode storage area>
FIG. 14B is a configuration diagram of a high-speed pulse mode storage area. As described above, in the high-speed pulse mode, it is possible to register one dimming value corresponding to the illuminance based on the command transmitted from the CPU 201 of the power supply device 200, and in the first embodiment, the registration number 0 As a result, a dimming value 2030 with an illuminance of 66% is registered.

That is, as described in FIG. 5, in the high-speed pulse mode, the LED is controlled to repeatedly emit light with the illuminance of the registration number 0 in the order of registration number 0 → registration number 0 → registration number 0 → ... , Illuminance 66% → Illuminance 66% → Illuminance 66% → ... Since the light is emitted with the same illuminance, the lighting and extinguishing of the illuminance 66% are repeated depending on the presence or absence of the input of the external pulse signal.

Even during operation in the high-speed pulse mode, if the illuminance is changed by the operation of the operation unit 207 of the power supply device 200, an illuminance command is transmitted to each CPU of the lighting device SS at the changed timing. It may be configured so that the illuminance can be changed.

<Normal mode storage area>
FIG. 14C is a configuration diagram of a normal mode storage area. As described above, in the normal mode, it is possible to store one illuminance based on the illuminance command transmitted from the CPU 201 of the power supply device 200, and in the first embodiment, the dimming value at which the illuminance becomes 35%. 1076 is stored.

That is, as described with reference to FIG. 5, in the normal mode, the LED is controlled to continue emitting light at the stored illuminance, so that the LED continues to emit light at an illuminance of 35%.

<Illuminance correction processing>
It should be noted that there is a possibility that the set illuminance and the actual illuminance of the LED may deviate from each other depending on the individual difference and characteristics of the LED. Therefore, when a deviation occurs, a correction process is performed to eliminate the deviation. By performing the correction process in this way, the illuminance of each LED becomes uniform.

Further, a storage table (corrected illuminance storage table) different from the illuminance storage table is provided, and the corrected illuminance storage table of the EEPROM of each LED substrate stores the corrected illuminance, and the display 206 of the power supply device 200 When displaying the illuminance, the illuminance set by the inspector is displayed with reference to the illuminance stored in the EEPROM 204 of the power supply device 200, but when the LED is actually emitted, it is stored in the corrected illuminance storage table. It may be configured to refer to the illuminance.

<<< Display screen displayed on the display 206 of the power supply device 200 >>>
FIG. 15 is an image diagram of a display screen displayed on the display 206 of the power supply device 200.
(1) Accumulated time The integrated time of the inspection execution state is displayed first from the top on the left side. In this example, it is used for 12 hours and 34 minutes.
(2) Lighting mode The currently set lighting mode is displayed in the second from the top on the left side. In this example, the high-speed pulse mode is set.
(3) Dimming value The dimming value corresponding to the currently set illuminance is displayed in the third position from the top on the left side. In this example, the dimming value is set to "511".
(4) Temperature The current temperature of the predetermined LED substrate is displayed in the upper part on the right side. In this example, the temperature of the LED substrate is 25 ° C.
(5) Illuminance In the lower part on the right side, an indicator and a numerical value indicating the currently set illuminance are displayed. In this example, the illuminance is set to 50 percent, the indicator is half-filled and displayed as "50 percent". The indicator may be configured so that one scale is displayed every few percent (for example, 10 percent). For example, at 50 to 59 percent, the same indicator may be displayed (filled in half). Good.

<< Summary of the first embodiment >>
As described above, in the first embodiment, three types of illumination modes, a high-speed dimming mode, a high-speed pulse mode, and a normal mode, are provided. Among them, the high-speed dimming mode sets the dimming value corresponding to the illuminance. It is possible to register more than one, and since it is configured to determine the registered dimming value according to the combination of multiple select signals and change the illuminance of the LED according to the on of the external pulse signal, it is registered. It is possible to detect different types of defects corresponding to a plurality of illuminances while the plurality of illuminances are made to go around once. Further, in the high-speed pulse mode, instead of changing the dimming value to change the illuminance of the LED, the on / off switch 311 or the like controls the light emission or extinguishing of the LED while keeping the dimming value constant. The LED can be turned on or off, and defects can be detected quickly.

<<<<<< Second Embodiment >>>>>
Next, as the second embodiment, the case where the lighting device SS-1 which is a lighting device different from the first embodiment is used for the inspection device will be mainly described as the changes from the first embodiment. ..

The difference between the lighting system and the first embodiment will be described with reference to FIG.

In the second embodiment, the lighting device and the power supply device described in the first embodiment are integrally configured. The lighting device SS-1 includes a power supply device 900, a CPU 901, a ROM 902, a RAM 903, an EEPROM 904, a communication interface 905, a display 906, an operation unit 907, an I / O port 908, an on / off switch 909, and the like. It mainly includes a DAC 920 and an LD 921.

The lighting device SS-1 includes an LD921 (laser diode) configured as one module, and the LD921 is provided with a plurality of LDs (for example, three LDs), but is one LD. You may.

<Squint view inside the lighting device>
FIG. 17 is a perspective view of the inside of the lighting device showing an outline of the optical system and the optical path in the second embodiment. Light is emitted from the LD 921 provided inside the lighting device SS-1, the light is diffused by the diffuser lens 370 provided on the front surface of the LD, and the diffused light is emitted from the exit hole SA.

With this configuration, in the lighting device SS-1 according to the second embodiment, the light can be made into approximately parallel light and emitted from the emission hole.

<Circuit diagram>
FIG. 18 is a block diagram showing an outline of the circuit according to the second embodiment. The difference from the first embodiment is that, as described above, the lighting device SS-1 is integrated with the power supply device and the lighting device according to the first embodiment, and the light source used is different. .. Specifically, in the second embodiment, the CPU 201 included in the power supply device 900 controls the light emission of the LD. Since the LD is used as the light source and the number of light sources mounted on one substrate is small, one DAC and one thermistor for detecting the temperature of the LD are mounted.

<< Lighting mode >>
<Internal pulse mode>
FIG. 19 is a timing chart showing the internal pulse mode of the lighting device SS-1. The horizontal axis of the time chart shown in FIG. 19 is the time (time) T, and the vertical axis is the illuminance of the light emitted from the LD. In the example shown in FIG. 19, lighting and extinguishing are repeated at a constant illuminance between the minimum value MIN and the maximum value MAX of the illuminance. The vertical axis of the time chart of the internal pulse signal is voltage.

In the internal pulse mode, a pulse is generated inside the lighting device SS-1, and the inspector operates the operation unit 907 in advance, so that the illuminance output by the LD of the lighting device SS-1 is set to the registration number of 1 to EEPROM 904. In this mode, the light is stored in advance, the registered dimming value is read out, and the lighting and extinguishing are repeated according to the generated pulse.

When the internal pulse mode is set, the pre-registered dimming value of 1 is read from the EEPROM 904, and the DAC outputs an analog signal (voltage signal) of the voltage value corresponding to the dimming value of 1. Be maintained. The internal pulse signal has a low level (LOW) state and a high level (HIGH) in a predetermined period (for example, a period that can be set by the inspector operating the operation unit 907 within the range of 100 μs to 100 ms). It is a signal that repeats the state. The lighting device SS-1 is provided with an on / off switch (analog switch) 311-1, and an internal pulse signal is input to the on / off switch 311-1 to control the operation of the on / off switch 311-1.

When the internal pulse signal is in the low level (LOW) state, the on / off switch 311-1 is turned off to bring the analog signal (voltage signal) output from the DAC into a non-conducting state (cutoff state). At this time, the analog signal output from the DAC is not supplied to the voltage-current conversion circuit, the drive current is not supplied to the LED, and the LED is turned off.

On the other hand, when the internal pulse signal is in the high level (HIGH) state, the on / off switch 311-1 is turned on to bring the analog signal (voltage signal) output from the DAC into the conductive state (cutoff state). At this time, the analog signal output from the DAC is supplied to the voltage-current conversion circuit, the current converted by the voltage-current conversion circuit is supplied to the LD as a drive current, and the LD corresponds to a dimming value of 1. It will be lit with illuminance.

As described above, in the internal pulse mode, the dimming value of 1 stored in the EEPROM 904 in advance is read out, and the voltage signal corresponding to the dimming value of 1 is continuously output from the DAC. By driving the on / off switch 311-1 by the internal pulse signal, the LD can be turned on or off by making the analog signal (voltage signal) output from the DAC conductive or non-conducting. Since the lighting or extinguishing is controlled only by driving the on / off switch 311-1 while maintaining the state in which the analog signal (voltage signal) from the DAC is output, the lighting or extinguishing can be switched at high speed.

Further, since the internal pulse is used, the lighting or extinguishing can be controlled only by the lighting device SS-1 without using an external signal, and the processing and the configuration can be simplified.

<Commands, signals, dimming values used in internal pulse mode>
As shown in FIG. 20, in the internal pulse mode, the CPU 901 controls the LD by the internal pulse signal. Specifically, by the operation of the operation unit 207 by the inspector, the CPU 0901 stores the dimming value corresponding to the illuminance of the registration number 0 in the EEPROM 904, and is stored in the registration number 0 when the internal pulse signal is on. The dimming value corresponding to the illuminance is output.

<Commands, signals, and dimming values used in high-speed dimming mode>
The signal used in the high-speed dimming mode is the same as that of the first embodiment, but in the second embodiment, since the plurality of LDs are configured and controlled as one module, the plurality of signals of the first embodiment There is no need to synchronize with a synchronization signal like the LED of. Therefore, the synchronization signal in the second embodiment is not used to synchronize a plurality of LDs, but is used to start the output of the illuminance of registration number 0.

In any of the normal mode, high-speed dimming mode, high-speed pulse mode, and internal pulse mode, one CPU 901 of the lighting device SS-1 is registered in the EEPROM 904 by the operation of the operation unit 907 by an inspector or the like. Since the light emission control of the LD is performed based on the dimming value (in the case of high-speed dimming mode, high-speed pulse mode, internal pulse mode) or the set dimming value (in the case of normal mode), as in the first embodiment. It is not necessary to send a command for registering the dimming value from the CPU of the power supply device to the CPU of the lighting device.

<Control processing of lighting device SS-1>
21 and 22 are flowcharts of the lighting control process according to the second embodiment. The major difference from the first embodiment is that the processing performed by the CPU of the power supply device and the processing performed by the CPU of the lighting device in the first embodiment are performed by only one CPU 901. This is a point that transmission / reception processing between the CPU of the lighting device and the CPU of the lighting device is no longer necessary. Hereinafter, the differences in the processing contents from the first embodiment will be mainly described.

In the second embodiment, the CPU 901 executes the control process of step 1000-1.

If it is determined in step 1002 that the initialization is based on the operation of the inspector's operation unit 907 (in the case of Yes), the CPU 901 initializes the stored information in the RAM 903 in step 1004.

If it is determined in step 1010 that the illuminance has changed based on the operation of the inspector's operation unit 907 (in the case of Yes), in step 1012-1 the CPU 901 changes the illuminance to the illuminance data table of the EEPROM 904. Write (dimming value).

Further, when it is determined in step 1014 that the lighting mode is changed based on the operation of the inspector's operation unit 907 (in the case of Yes), in step 1016-1, the CPU 901 performs the lighting mode switching process and the inspector. Switches to the lighting mode set by.

Furthermore, when the process of step 1024 or step 1024-1 is completed, the process proceeds to the process of step 1026.

When the process of step 1028 is completed, the process proceeds to the process of step 2017.

Further, in the case of No in step 2020 of FIG. 22, in step 2028, the CPU 901 determines whether or not it is in the normal mode.

Further, in the case of Yes in step 2028, in step 2400, the CPU 901 performs the normal mode output process.

Furthermore, if No in step 2028, the CPU 901 performs internal pulse mode output processing in step 2600.

Further, when the processes of steps 2400 and 2600 are completed, the process proceeds to the process of step 2500.

Further, when the process of step 2026 is completed, if the process is No in step 2017 and the process is No in step 2024, the process proceeds to the process of step 1006.

<Internal pulse mode output processing>
FIG. 23 is a flowchart of the internal pulse mode output process in step 2600. In the internal pulse mode output process, first, in step 2602, the CPU 901 determines whether or not the internal pulse signal is ON (HIGH level).

If Yes in step 2602 (when the internal pulse signal is on (HIGH level)), in step 2604, the CPU 901 turns on the on / off switch 311-1.

If No in step 2602 (when the internal pulse signal is off (LOW level)), in step 2606 the CPU 901 turns off the on / off switch 311-1.

When the processing of step 2604 and step 2606 is completed, the caller is returned.

<< Illuminance memory table >>
<Internal pulse mode storage area>
FIG. 24D is a block diagram of the internal pulse mode storage area according to the second embodiment. The difference from FIG. 14 of the first embodiment is that it includes an internal pulse mode storage area.

As described above, in the internal pulse mode, the CPU 901 can register one dimming value corresponding to the illuminance based on the operation of the operation unit 907 by the inspector, and in the example shown in FIG. 24 (d), it is possible to register one dimming value. , A dimming value 2522, which has an illuminance of 82%, is registered as the registration number 0.

That is, as described with reference to FIG. 19, in the internal pulse mode, every time the internal pulse signal is turned on (HIGH level), the registration number 0 → registration number 0 → registration number 0 → ... In order to control the LD to repeatedly emit light with illuminance, the LD is emitted with the same illuminance as illuminance 82% → illuminance 82% → illuminance 82% → ..., and the internal pulse signal is turned on (HIGH level) or off (HIGH level). Depending on the LOW level), turning on and off with an illuminance of 82% (illuminance 0) will be repeated.

<< Summary of the second embodiment >>
As described above, the lighting device is composed of one light source or one light source module, and is integrally configured with the power supply device (power supply unit), or the power supply device (power supply unit) is provided inside the lighting device. As in the first embodiment, the illumination mode includes three types of modes: high-speed dimming mode, high-speed pulse mode, and normal mode. In the high-speed dimming mode, it is possible to register a plurality of illuminances, and it is configured to output with the registered illuminance according to the combination of a plurality of select signals. This makes it possible to detect different types of defects while the plurality of registered illuminances make one round.

200 power supply SS lighting device 350 housing 360 rod lens 370 diffuser lens

Claims (7)

A light source that emits light of a predetermined brightness,
A storage unit that stores a plurality of dimming values corresponding to each of the plurality of brightnesses of the light emitted from the light source.
A control unit that sequentially reads out each of the plurality of dimming values from the storage unit in a fixed order, generates a drive signal based on the read dimming values, and supplies the drive signal to the light source is provided.
The control unit reads out one dimming value according to the certain order from the plurality of dimming values from the storage unit, and supplies a lighting signal corresponding to the one dimming value as the drive signal. A lighting device having a first light emitting mode that controls lighting to light the light source. Further provided with a conduction state selection unit that determines a conduction state for transmitting the drive signal to the light source or a cutoff state for not transmitting the drive signal to the light source.
The storage unit stores a predetermined constant dimming value and stores it.
The control unit reads out the predetermined constant dimming value from the storage unit, and maintains a state in which a lighting signal corresponding to the predetermined constant dimming value is emitted as the drive signal.
The control unit alternately performs lighting control for turning on the light source by making the conduction state selection unit in a conduction state and extinguishing control for turning off the light source by turning off the conduction state selection unit. The lighting device according to claim 1, which has a second light emitting mode that repeats. The storage unit stores a dimming value for constant lighting, and stores the dimming value.
Claim 1 or 2 has a third light emitting mode in which the control unit reads a dimming value for constant lighting from a storage unit and emits a lighting signal corresponding to the dimming value for constant lighting as the drive signal. The lighting device described in. 3. The control unit controls the lighting of the light source by selecting a light emitting mode of any one of the first light emitting mode, the second light emitting mode, and the third light emitting mode. The lighting device described in. The lighting device according to any one of claims 1 to 4,
A lighting system having a power supply device that is configured separately from the lighting device and supplies electric power to the lighting device. The power supply device
An operation unit that can be operated by the inspector,
A command transmitting means for transmitting a dimming value command indicating a dimming value set based on the operation of the operation unit to the lighting device is provided.
The control unit of the lighting device
A command receiving means for receiving a dimming value command transmitted from the command transmitting means of the power supply device is provided.
The lighting system according to claim 5, wherein the light source is turned on based on the received dimming value command. The lighting device according to claim 1 to 4, wherein the lighting device is integrally configured with the lighting device and further includes a power supply unit that supplies electric power to the light source.

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