JP7323175B2 - Lighting device and lighting system using the lighting device - Google Patents

Description

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

In general, an illumination device mainly includes a light source, a first lens (rod lens), and a diffusing lens. The first lens condenses light emitted from the light source. The diffusing lens diffuses and irradiates the light condensed by the first lens. A line sensor camera captures an image of the irradiated light, and the line sensor camera detects the presence or absence of defects (for example, surface defects such as scratches) in various devices.

JP 2010-203923 A

However, the conventional lighting device has a problem that the layout (arrangement) of the inspection device in the inspection field is restricted because the direction of connecting the cable and the lighting device is determined.

Therefore, the present invention has been made in view of the above circumstances, and provides an illumination device that can increase the degree of freedom in connection with cables and the degree of freedom in the layout (arrangement) of inspection devices in an inspection field. for the purpose.

The lighting device according to the invention is characterized by:
A lighting device having a plurality of light source control boards,
Each of the plurality of light source control boards,
a light source that emits light with a predetermined brightness;
a storage unit that stores a control value corresponding to the brightness of light emitted from the light source;
a control unit that reads the control value, generates a drive signal based on the read control value, and supplies the drive signal to the light source;
with
each control unit of the plurality of light source control boards can generate identification information for identifying other light source control boards ;
each of the plurality of light source control boards further comprises a communication port for controlling transmission and reception of the identification information;
The plurality of light source control boards includes a first light source control board and a second light source control board,
The control unit of the first light source control board puts the second light source control board into a reception permission state in which the identification information can be received via the communication port,
each of the plurality of light source control boards is communicably connected to a command line separately from the communication port;
The control unit of the second light source control board receives the identification information via the command line, triggered by the reception permission state.

According to the present invention, the lighting device and the cable can be easily connected according to the layout (arrangement) of the inspection devices in the inspection field.

It is a block diagram showing an illumination system of the inspection device according to the present embodiment. 1 is an external view of a lighting device according to this embodiment; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the whole structure of the illuminating device by this embodiment. FIG. 4 is a schematic diagram showing how light travels in the longitudinal direction of the lighting device according to the present embodiment; 1 is a block diagram showing an outline of the overall circuit configuration of a lighting system according to this embodiment; FIG. 4 is a timing chart of illumination by the LED group according to the present embodiment; 4 is a flowchart of power supply control processing according to the embodiment; 4 is a flowchart of lighting control processing according to the embodiment; FIG. 4 is a schematic diagram of an electrical configuration used for address allocation processing according to the present embodiment; 4 is a flowchart of address allocation processing according to the present embodiment; It is a block diagram (a) of the illuminance detection system by this embodiment, and the external perspective view (b) of the illuminating device by this embodiment, and an illumination detection part. It is a figure which shows the specific example of the setting process for 100% by this embodiment. It is a figure which shows the specific example of the setting process for 50% by this embodiment. It is a figure which shows the specific example of the setting process for 1% by this embodiment. 4 is a flowchart of PC-side control processing according to the present embodiment; 10 is a flowchart (a) of 100% setting processing according to this embodiment, a flowchart (b) of 50% setting processing according to this embodiment, and a flowchart (c) of 1% setting processing according to this embodiment. 5 is a flowchart of power supply side dimming adjustment processing according to the present embodiment; 6 is a flowchart of illumination-side dimming adjustment processing according to the embodiment; It is an example of the registration image figure at the time of the completion of light control adjustment by this embodiment. It is the schematic of the full illumination mode by this embodiment, (a), and the schematic of the low illumination intensity mode by this embodiment, the medium illumination intensity mode, and the high illumination intensity mode, and (b). 4 is a flowchart of error check processing according to the embodiment;

<<<Outline of Lighting System>>>
The illumination system is mainly used for inspecting whether or not defects exist in an inspection object, and is a system that illuminates the inspection object with inspection light. An operator (for example, an inspector) sets the brightness of the light by operating the power supply, etc., and the illumination device irradiates the light according to the brightness setting, thereby identifying the type of defects in the inspection object. Conduct appropriate inspections.

<<<<outline of the present embodiment>>>>
The lighting device of the present embodiment has a plurality of LED boards, a plurality of LEDs (LED group) on one LED board, and identification information for identifying each LED group is assigned when power is turned on. This allows each of the multiple LED groups to be controlled separately, if desired. In the lighting device of the present embodiment, from low luminance (low illuminance) to high luminance (high illuminance), in order to control the luminance (illuminance) of light emitted from LED groups of a plurality of LED substrates to be nearly uniform. , 3 points (intensity of 1%, 50%, and 100%) of the light from the LED group is made uniform, and uniform light can be emitted as a whole.

<First Embodiment>
The lighting device of the first embodiment includes:
a light source that emits light with a predetermined brightness;
a storage unit that stores a control value (DAC value) corresponding to the brightness of light emitted from the light source;
a communication port for sending and receiving control commands;
reading the control value, generating a drive signal based on the read control value and supplying it to the light source, and receiving a control command when the first port of the communication ports is at a first value (LOW level); a control unit that does not receive a control command when the first port is at a second value (HIGH level);
with
The control unit is a lighting device configured to store identification information by receiving a control command when the first port has a first value.

A lighting device according to a first embodiment includes a light source, a storage section, a communication port, and a control section. The light source emits light with a predetermined brightness. Brightness may directly or indirectly indicate the brightness of light emitted from a light source, and may be, for example, illuminance, luminance, or luminosity. Illuminance is the brightness of the light that illuminates the surface of an object, and depends on the distance from the light source. Luminance is the brightness of a light source and does not depend on the distance from the light source. When illuminance is used as the brightness, the brightness of the light source can be indicated by keeping the distance from the light source constant. Luminous intensity is the brightness of light per unit solid angle emitted in a direction from a light source. Light emitted from the light source illuminates the inspection object. Defects to be inspected include convex defects, streak defects, concave defects, dents, dust, and the like, and these defects exist on the surface of the inspection object. By illuminating the inspection object, these defects can be detected.

The CPU 351 of the LED board 350 can receive control commands through an I/O port (communication port). Commands sent and received by the CPU 351 of the LED board 350 are collectively referred to as control commands. Here, the control commands include an address allocation command used for storing identification information (address number). The identification information is information for identifying the control unit (LED board 350, etc.). In addition, in the lighting control of an LED, etc., which will be described later, the control command includes a command related to an input value, which will be described later.

As shown in FIG. 9, in the LED board 350-1, the port 1 of the I/O port 359-1 (communication port) is connected to the end board 310 and is at the LOW level. CPU 351 - 1 of LED board 350 - 1 receives the address allocation command sent from CPU 201 of power supply 200 because port 1 of I/O port 359 - 1 is at the LOW level. At this time, in the LED board 350-2, the port 1 of the I/O port 359-2 is at HIGH level by the control voltage. The CPU 351-2 of the LED board 350-2 does not receive the address allocation command because port 1 of the I/O port 359-2 is at HIGH level.

Thus, the CPU 351-1 of the LED board 350-1 is the first among the CPUs 351 of the plurality of LED boards 350 to receive the address allocation command and store the address number.

<Second Embodiment>
In the lighting device of the second embodiment, in the first embodiment,
the communication port comprises a second port different from the first port;
The controller is a lighting device that changes the second port from a second value to a first value after storing the identification information.

As shown in FIGS. 9 and 10, the I/O ports (communication ports) include at least port 1 and port 2. Upon receiving the address allocation command, the CPU stores the address number and then selects port 2. Change from HIGH level to LOW level.

As shown in FIG. 9, port 2 of the I/O port 359 (eg, I/O port 359-1) of the LED board 350 (eg, LED board 350-1) is connected to the adjacent LED board 350 (eg, LED board 350-1). 350-2) is connected to port 1 of the I/O port 359 (eg, I/O port 359-2). Therefore, when the CPU 351 (for example, CPU 351-1) changes the port 2 to LOW level, the port 1 of the I/O port 359 of the next LED board 350 (for example, LED board 350-2) becomes LOW level. As a result, the CPU 351 (for example, CPU 351-2) of the next LED board 350 can receive the address allocation command. In this way, the LED board 350-1 to which the identification information has already been assigned changes the value of the first port of the adjacent LED board 350-2 to which the identification information has not yet been assigned from the second value to the first value. By doing so, the LED board 350-2 can be the target to which the identification information is to be allocated next. In other words, the LED board 350 whose first port value is the second value is in a state in which allocation of identification information is prohibited, and the LED board 350 whose first port value is the first value is in a state where the identification information allocation is allowed.

<Third Embodiment>
In the lighting device of the third embodiment, in the first embodiment or the second embodiment,
The control unit is a lighting device configured to collectively control at least some of the plurality of light sources, and configured to update the identification information after storing the identification information.

The CPU 351 of the LED board 350 (for example, the CPU 351-1 of the LED board 350-1) selects the first 13 of the 26 LEDs mounted on the LED board 350 (for example, the LED-a 356a). and a second group of 13 LEDs (for example, LED-b 356b) can be controlled. That is, the CPU 351 of the LED board 350 controls the first 13 LED groups with the control values corresponding to the first 13 LED groups, and controls the second 13 LED groups. The control value controls the second group of 13 minute LEDs. Note that the CPU 351 of the LED board 350 may control the 26 LEDs individually or collectively control all the 26 LEDs.

The address number indicates the number of the LED group in lighting device 300 . When the CPU 351 receives the address allocation command and stores the address number, the CPU 351 updates the address number according to the number of LED groups.

Thus, the address number is configured to be determined corresponding to one LED group.

<Fourth Embodiment>
The lighting system of the fourth embodiment comprises:
any lighting device according to the first embodiment to the third embodiment;
a power supply device configured separately from the lighting device and supplying power to the lighting device;
has
The control unit of the power supply device transmits a control command to the lighting device,
In the lighting system, the control unit of the lighting device is configured to transmit a command indicating that the identification information has been stored when the second port has a first value after storing the identification information.

As shown in FIGS. 1, 7 and 9, the power supply device 200 and the lighting device 300 are separate units, and the CPU 351 of the LED board 350 assigns an address number based on the address number assignment command transmitted by the power supply device 200. , is configured to store. Note that the power supply device 200 and the lighting device 300 may be connected by wire or wirelessly.

In this way, when the power supply device 200 and the lighting device 300 are connected (for example, by a cable or the like) and power (electric power) is supplied from the power supply device 200 to the lighting device 300, an address number allocation command is issued from the power supply device 200. It is transmitted to the illumination device 300, and the CPU 351 of the LED board 350 of the illumination device 300 assigns and stores address numbers in order of reception. When the CPUs 351 of all the LED boards 350 of the illumination device 300 finish the address number allocation process, the CPU of the last LED board transmits an address allocation process end command to the power supply device 200 . As a result, the power supply device 200 can recognize that the address number assignment processing in the lighting device 300 has been completed normally, and the power supply device 200 can perform operations related to control of the lighting device 300 .

As described above, by changing the value of the first port of the LED board 350 from the second value to the first value, the identification information allocation prohibited state is changed to the allocation permitted state. When the LED board 350 changed to the allocation-permitted state receives a command indicating identification information, the identification information is allocated to the LED board 350 . That is, even if the LED board 350 in the allocation prohibited state whose first port value is the second value receives the command indicating the identification information, the LED board 350 is not allocated the identification information.

<<<<this embodiment>>>>
BEST MODE FOR CARRYING OUT THE INVENTION The present embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the drawings. In this specification and drawings, components with the same reference numerals have substantially the same structure or function.

<<<Lighting system configuration>>>
A lighting system according to the present embodiment will be described with reference to FIG. The lighting system according to this embodiment includes an external device 100 including a personal computer or the like, a power supply device 200 and a lighting device 300 . The external device 100 and the power supply device 200 are connected by a cable (command line CL, control signal line PL) or the like, and commands and signals can be transmitted and received between the external device 100 and the power supply device 200 . The power supply device 200 and the lighting device 300 are connected by a cable or the like (command line CL, control signal line PL, power line EL), and commands and signals are transmitted and received between the power supply device 200 and the lighting device 300. can be done. By configuring in this way, the lighting device 300 can emit light according to the brightness setting.

<<external device 100>>
The external device 100 forms part of an inspection device (not shown) for inspecting an inspection object. The external device 100 can be operated by an operator. The external device 100 outputs a pulse signal. The pulse signal is supplied from an external device 100 (to be described later) to the power supply device 200 via the control signal line PL, and is supplied from the power supply device 200 to the lighting device 300 . The pulse signal is used for lighting control and extinguishing control of the LEDs of the lighting device 300 . The operator can set the cycle of the pulse signal by operating the external device 100 .

<<power supply device 200>>
Power supply device 200 includes CPU 201, ROM 202, RAM 203, EEPROM (registered trademark) 204, communication interface 205, display 206, operation unit 207 (volume 270A, switch 270B), and I/O port 208. Mainly, an end substrate 310, an end substrate 320, and an LED substrate 350 (LED substrate 350-1, LED substrate 350-2, LED substrate 350-3, LED substrate 350-4, which will be described later) are connected via the power supply line EL. ) with a power supply voltage (eg, 35 V to 45 V). The power supply device 200 transmits a control command to the lighting device 300 via the command line CL, and also outputs a pulse signal output from the external device 100 to the lighting device 300 via the control signal line PL. The power supply device 200 may output the external pulse signal output from the external device 100 as it is, or may output the signal after performing signal processing such as waveform shaping. The power supply device 200 is connected to an external power supply (not shown) and supplied with power supply voltage.

<<Lighting Device 300>>
The illumination device 300 mainly includes an edge substrate 310, an edge substrate 320 and a plurality of, eg, four LED substrates 350 (350-1, 350-2, 350-3, 350-4). In FIG. 1, the LED board 350-2 and the LED board 350-3 are omitted. Four LED boards (350-1, 350-2, 350-3, 350-4) are connected in parallel between the end board 310 and the end board 320. FIG. Unless it is necessary to distinguish between the four LED boards (350-1, 350-2, 350-3, 350-4) in the following description, they are simply referred to as LED boards 350. FIG. Control commands transmitted from the CPU 201 of the power supply device 200 are input to the LED boards 350-1, 350-2, 350-3, and 350-4 via the command line CL. As will be described later, each of the plurality of LED boards 350 has a similar configuration and 26 LEDs are mounted thereon. The overall configuration of the illumination device 300 will be described later with reference to FIGS. 2 and 3. FIG.

<End substrate 310>
The end substrate 310 serves as a relay substrate when transmitting a control command transmitted from the CPU 201 of the power supply device 200 to the LED substrate 350 of the lighting device 300, and transmits a control command transmitted from the LED substrate 350 of the lighting device 300 to the power supply device. It functions as a relay board for transmission to the CPU 201 of the 200 . The end substrate 310 is provided with connectors (not shown) for relaying cables such as the command line CL and the control signal line PL. Also, the end substrate 310 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 substrate 350 (350-1, 350-2, 350-3, 350-4)>
The LED board 350 mainly includes a CPU, ROM, RAM, EEPROM, DAC-a, DAC-b, LED-a, LED-b, and an I/O port. When there is no need to distinguish between the CPUs (351-1, 351-2, 351-3, 351-4) of the four LED boards 350, they are simply referred to as CPUs 351. FIG. The ROMs (352-1, 352-2, 352-3, 352-4) of the four LED boards 350 are simply referred to as ROMs 352 when there is no need to distinguish them. The RAMs (353-1, 353-2, 353-3, 353-4) of the four LED boards 350 are referred to as RAMs 353 when there is no need to distinguish them. The EEPROMs (354-1, 354-2, 354-3, 354-4) of the four LED boards 350 are referred to as EEPROMs 354 when there is no need to distinguish them. The DAC-a (355a-1, 355a-2, 355a-3, 355a-4) of the four LED boards 350 are referred to as DAC-a 355a when there is no need to distinguish them. The DAC-b (355b-1, 355b-2, 355b-3, 355b-4) of the four LED boards 350 are referred to as DAC-b 355b when there is no need to distinguish them. When there is no need to distinguish the LED-a (356a-1, 356a-2, 356a-3, 356a-4) of the four LED boards 350, they are referred to as LED-a 356a. When there is no need to distinguish the LED-b 356b (356b-1, 356b-2, 356b-3, 356b-4) of the four LED boards 350, they are referred to as LED-b 356b. The I/O ports (359-1, 359-2, 359-3, 359-4) of the four LED boards 350 are referred to as I/O ports 359 when there is no need to distinguish them.

26 LEDs are mounted on the LED board 350 . In this embodiment, the LED board 350 divides the 26 LEDs in half and controls them. That is, the LED board 350 includes a first group of 13 LEDs (referred to as LED-a 356a) of the 26 LEDs and a second group of 13 LEDs (referred to as LED-b 356b). and control each of the The 26 LEDs are linearly arranged on the LED substrate 350 . Of the 26 LEDs, the 1st to 13th LEDs belong to LED-a 356a, and the 14th to 26th LEDs belong to LED-b 356b.

The DAC-a 355a (DAC-b 355b) is a D/A converter, used to control the LED-a 356a (LED-b 356b), and has a circuit that converts a digital signal into an analog signal. The DAC-a 355a (DAC-b 355b) can convert a digital signal output from the CPU 351 into an analog signal, as will be described later. A digital signal output from the CPU 351 indicates a DAC value (0 to 4095), and the DAC value is converted to an analog signal voltage value by the DAC-a 355a (DAC-b 355b).

The number of LED boards 350 provided in the illumination device 300 can be changed as appropriate according to the width (length, etc.) of the inspection object and the length of the illumination device 300 required by the operator.

<End substrate 320>
The end substrate 320 serves as a relay substrate when transmitting control commands transmitted from the CPU 201 of the power supply device 200 to the LED substrate 350 of the lighting device 300, and transmits control commands transmitted from the LED substrate 350 of the lighting device 300 to the power supply device. It functions as a relay board for transmission to the CPU 201 of the 200 . The end substrate 320 is provided with connectors (not shown) for relaying cables such as the command line CL and the control signal line PL. Also, the end substrate 320 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.

<Command line CL, control signal line PL, power supply line EL>
The external device 100 and the power supply device 200 are connected by a cable or the like. The power supply device 200 and the lighting device 300 are connected by a cable or the like. As shown in FIG. 1, in lighting device 300, end substrate 310 and LED substrate 350-1, LED substrate 350-1 and LED substrate 350-2, LED substrate 350-2 and LED substrate 350-3, and LED substrate 350- 3 and the LED board 350-4, and the LED board 350-4 and the end board 320 are connected by cables or the like. By being connected in this way, a command line CL is configured that enables transmission and reception of control commands between the external device 100, the power supply device 200, and the lighting device 300, and the control signal (pulse signal) transmitted from the external device 100 is configured. signal) to the power supply device 200 and the LED substrate 350, and a power supply line EL to which the power supply device 200 and the LED substrate 350 are electrically connected.

<<<Overall Configuration of Lighting Device 300>>>
Next, FIG. 2 is an external view of the illumination device 300. As shown in FIG. A connector 20 (receptacle) and a connector 21 (receptacle) are provided on the side surface of the lighting device 300 . The connector 20 or the connector 21 is connected to a connector of the power supply device 200 by a cable or the like. By being connected in this manner, power (power) is supplied from the power supply device 200 to the lighting device 300 , and control commands can be transmitted and received between the power supply device 200 and the lighting device 300 .

Connector 20 is electrically connected to end substrate 310 and connector 21 is electrically connected to end substrate 320 .

In this specification, for convenience of explanation, it may be described that the CPU 201 of the power supply device 200 transmits a command to the lighting device 300, or that the lighting device 300 transmits a command to the CPU 201 of the power supply device 200. Specifically, commands transmitted by the CPU 201 of the power supply device 200 are transmitted to the CPU 351 of the LED board 350 , and commands transmitted by the CPU 351 of the LED board 350 are transmitted to the CPU 201 of the power supply device 200 . means

The lighting device 300 is formed with an irradiation section 10 that is an opening, and the light emitted from the LED is emitted from the irradiation section 10 .

Next, the overall configuration of the illumination device 300 will be described with reference to FIG. The lighting device 300 mainly includes a housing 30 , a plurality of LED boards 350 , a plurality of LEDs, a rod lens 40 and a diffuser lens 50 . Specifically, lighting device 300 includes four LED boards, and 26 LEDs are mounted on one LED board.
<Case 30>
The housing 30 houses the components of the lighting device 300 and roughly defines the outer shape. The housing 30 is made of aluminum and formed by extrusion molding.

The housing 30 has a groove-like shape elongated in the longitudinal direction. The housing 30 has a bottom portion 31 and two side portions (32, 33) facing each other with the bottom portion 31 therebetween. The bottom portion 31 and the two side portions are elongated in the longitudinal direction and have a flat shape. The two side portions have the same size and shape, stand upright along the height direction with respect to the bottom portion 31, and are arranged parallel to each other.

Each of the two side surface portions has a top surface portion (34, 35) formed parallel to the bottom surface portion 31 at the top most distant from the bottom surface portion 31. As shown in FIG.

<LED board 350>
A plurality of LEDs are mounted on each of the LED substrates 350, and the LED substrates 350 supply power (power) for causing the plurality of LEDs to emit light, and a CPU 351 controls the lighting and extinguishing of the plurality of LEDs. done.

The LED substrate 350 is made of an aluminum substrate and has a thin rectangular shape. Twenty-six LEDs are mounted on each of the LED boards 350 . The 26 LEDs are linearly arranged along the longitudinal direction of the LED substrate 350 .

The LED board 350 is attached so that the LEDs face upward (in the Z direction). A plurality of LED boards 350 are mounted on the housing 30 . The plurality of LED boards 350 are arranged along the longitudinal direction (Y direction) of the housing 30 along the virtual arrangement line L1 so that the LED boards 350 adjacent to each other are in close contact with each other.

<LED>
The LED is a light source for emitting light from lighting device 300 . As mentioned above, 26 LEDs are mounted on the LED board 350 . The 26 LEDs of the LED board 350 emit light in the Z direction (upward).

<Rod lens 40>
A rod lens 40 collects the light emitted from the LED. The rod lens 40 is made of acrylic and has an elongated cylindrical shape.

The rod lens 40 is arranged above and separated from the LEDs so that the LED arrangement imaginary straight line L1 and the central axis line L2 of the rod lenses 40 are parallel.

The rod lens 40 is sandwiched from the left and right by lens stays (not shown) and fixed to the housing 30 via four lens stays.

<Diffuser lens 50>
The diffuser lens 50 is a diffuser plate for diffusing the light passing through the rod lens 40 .

The diffuser lens 50 is arranged along the longitudinal direction of the rod lens 40 . Specifically, the diffuser lens 50 is arranged above and separated from the rod lens 40 such that the central axis L3 of the diffuser lens 50 is parallel to the central axis L2 of the rod lens 40 .

A minute lens array is formed on the surface of the diffuser lens 50 . On the surface of the diffuser lens 50, long groove-like regions and long ridge-like regions are alternately formed adjacent to each other. The longitudinal direction of the grooved regions and the longitudinal direction of the ridged regions are approximately the width direction. The groove-shaped area and the ridge-shaped area repeat fine and random unevenness, and the fine unevenness functions as a fine lens array.

The diffuser lens 50 refracts the incident light at a desired diffusion angle (light distribution angle) by the diffusion function of the lens array to diffuse and shape the light. The diffuser lens 50 provides elliptical diffusion that diffuses more strongly in certain directions than in other directions. Specifically, the diffuser lens 50 diffuses more strongly in the length direction (longitudinal direction) than in the width direction (lateral direction).

<<<Progress of light>>>
After passing through the rod lens 40 , the light emitted from the LED is diffused by the diffuser lens 50 and emitted from the illumination device 300 . In the following, the traveling of the light in the width direction (lateral direction) and the light in the length direction (longitudinal direction) will be described.

<Advancement of Light in Width Direction (Transverse Direction)>
The light emitted from the LED enters the rod lens 40 while spreading. The light incident on the rod lens 40 is refracted according to the refractive index of the rod lens 40 and travels inside the rod lens 40 . The light traveling inside the rod lens 40 is refracted according to the refractive index of the rod lens 40 and emitted from the rod lens 40 . The direction in which light travels is determined by the angle of incidence of light incident on the rod lens 40, and the rod lens 40 functions as a convex lens with respect to the width direction (transverse direction) component, condensing the light incident on the rod lens 40. do. Light emitted from the LED is condensed by the rod lens 40 and emitted from the rod lens 40 .

Light condensed by the rod lens 40 enters the diffuser lens 50 . The diffuser lens 50 diffuses more strongly in the length direction (longitudinal direction) than in the width direction (lateral direction). Therefore, the light is emitted from the diffuser lens 50 without much diffusion in the width direction (lateral direction). That is, the light condensed by the rod lens 40 is emitted from the illumination device 300 with respect to the width direction (transverse direction) component.

<Progress of light in the length direction (longitudinal direction) component>
FIG. 4 is a schematic diagram showing light traveling with respect to the length direction (longitudinal direction) component. The light emitted from the LED enters the rod lens 40 while spreading. Light incident on the rod lens 40 is refracted according to the refractive index of the rod lens 40 , travels inside the rod lens 40 , is refracted according to the refractive index of the rod lens 40 , and exits the rod lens 40 . Regarding the longitudinal direction (longitudinal direction) component, the rod lens 40 does not have a light condensing function, and the light emitted from the LED goes through the same refraction process as parallel plate glass and is emitted from the rod lens 40. .

Light condensed by the rod lens 40 enters the diffuser lens 50 . The diffuser lens 50 diffuses more strongly in the length direction (longitudinal direction) than in the width direction (lateral direction). Therefore, as shown in FIG. 4, the light in the longitudinal direction (longitudinal direction) is diffused according to the shape and size of the lens array formed on the surface of the diffuser lens 50 and emitted from the diffuser lens 50. . That is, the light condensed by the rod lens 40 is emitted from the illumination device 300 with respect to the width direction (transverse direction) component.

In this way, the width direction (short direction) component becomes light condensed by the rod lens 40, and the length direction (longitudinal direction) component becomes light diffused by the diffuser lens 50, and is emitted from the illumination device 300. be done.

<<<circuit diagram>>>
FIG. 5 is a block diagram showing an outline of the overall circuit configuration of the lighting system. For the sake of simplicity, FIG. 5 representatively shows LED board 350-1 and LED board 350-2 in illumination device 300, and external device 100 is omitted. As described above, the LED boards 350-1 and 350-2 have the same configuration, but FIG. 5 shows only the I/O port 359-2 of the LED board 350-2, configuration has been omitted. The LED board 350 includes a CPU 351, a DAC-a 355a, a DAC-b 355b, an LED-a 356a, an LED-b 356b, an I/O port 359, a photodiode (PD), and a thermistor (TH1, TH2, TH3). , an A/D converter, a constant current circuit, and a current amplifier circuit are mounted. The current amplifier circuit has a range switching section.

A control signal (pulse signal) output from the power supply device 200 is input to the LED substrate 350-1. An on/off switch 360-1 (analog switch) is provided on the LED board 350-1. In this embodiment, the control signal (pulse signal) output from the power supply device 200 is input to the CPU 351-1 of the LED board 350-1 and also supplied to the on/off switch 360-1 of the LED board 350-1. be. When the control signal (pulse signal) is at high level, the on/off switch 360-1 is turned on, and the voltage signal converted by the DAC (DAC-a355a-1, DAC-b355b-1) is input to the constant current circuit. be. When the control signal (pulse signal) is at a low level, the on/off switch 360-1 is in a non-conducting state (blocking state), and the voltage signal converted by the DAC (DAC-a 355a-1, DAC-b 355b-1) is a constant current. No input to the circuit.

A control command transmitted from the CPU 201 of the power supply device 200 is input to the LED board 350-1 via the end board 310 or the end board 320. FIG. A control command is input to the CPU 351-1 through the I/O port 359-1 of the LED board 350-1. The control command includes various values and commands such as an input value for controlling the brightness of light emitted from the LED of the illumination device 300 and a lighting command for lighting the LED. The operator can operate the operation unit 207 of the power supply device 200 to adjust the brightness of the light emitted from the LED. A value used to adjust the brightness of the light emitted from the LED is called an input value. An operator can input an input value to the CPU 201 of the power supply device 200 by operating the operation unit 207 . The input values are included in the control command and input from the power supply device 200 to the CPUs 351 (351-1, 351-2, 351-3, 351-4).

CPU 350-1 of LED board 350-1 converts the received input value into a DAC value (digital value) (details will be described later). A digital signal representing the DAC value is output to the DACs (DAC-a 355a-1, DAC-b 355b-1). The DACs (DAC-a 355a-1, DAC-b 355b-1) convert digital signals representing DAC values into analog signals representing DAC values.

The DAC-a355a-1 is a DAC value (digital signal) for controlling the LED-a356a-1 of the first 13 LED group out of the 26 LEDs mounted on the LED board 350-1. to a voltage value (an analog signal indicating a DAC value), and the DAC-b 355b-1 converts the second 13 LEDs of the 26 LEDs mounted on the LED board 350-1 to LED -Converts the DAC value (digital signal) for controlling b356b-1 into a voltage value (analog signal indicating the DAC value).

Thus, a single input value is sent from the power supply 200 to the CPU 359 of each LED board 350 . As will be described later, the LED groups mounted on each LED board 350 have variations in the brightness of light emission due to individual differences. A DAC value is calculated based on (see formulas 1 and 2). In other words, the input value is a single value, but the DAC value calculated by each LED board 350 is a value according to the electrical characteristics and optical characteristics of the LED group mounted on each LED board 350. . By causing the LEDs to emit light using the DAC values corresponding to the electrical characteristics and optical characteristics, the brightness of the light emitted from the LEDs of each LED substrate 350 can be made uniform. Then, the CPU 359 of each LED board 350 outputs a digital signal indicating the DAC value to the DAC (DAC-a 355a, DAC-b 355b). It is converted to an analog signal representing the DAC value. Specifically, it is converted into an analog voltage signal indicating a DAC value (hereinafter referred to as a voltage signal indicating a DAC value).

A voltage signal indicating a DAC value output from the DACs (DAC-a355a-1, DAC-b355b-1) is input to a constant current circuit and converted into current. The constant current circuit is composed of elements such as an operational amplifier (operational amplifier) and resistors, and converts a voltage signal into a current signal with an amplification factor determined by a resistance value. That is, the constant current circuit converts the voltage signal indicating the DAC value into a current corresponding to the DAC value. The current output from the constant current circuit is input to the current amplifier circuit and amplified. The current amplifying circuit is composed of amplifying elements such as transistors and FETs, and amplifies the current output from the constant current circuit with a desired amplification factor. The current amplified by the current amplifier circuit is input to the LED group (LED-a 356a-1, LED-b 356b-1) as drive current for driving the LEDs. The LED group (LED-a 356a-1, LED-b 356b-1) emits light with brightness according to the drive current.

A first end FT of the LED group is connected to the power supply 200 . A second end ST of the group of LEDs is connected to a current amplifier circuit from which drive current is supplied to the group of LEDs, as described above. A first end FT of the LED group is connected to a power supply voltage monitoring circuit.

An A/D converter is provided on the LED board 350-1. An A/D converter converts an analog signal into a digital signal. The A/D converter is connected to the CPU 351-1 of the LED board 350-1. A digital signal converted by the A/D converter is input to the CPU 351-1. The A/D converter includes a power supply voltage monitoring circuit, a photodiode PD (which detects the illuminance of light emitted from the LED group), and a thermistor TH1 (the first group of 13 LEDs (LED-a356a-1 )) and the thermistor TH2 (which detects the temperature of the second group of 13 LEDs (LED-b356b-1)) are connected. The power supply voltage monitoring circuit consists of a resistor with a large resistance value, etc., converts the current value of the drive current supplied to the LED group into a voltage value within a predetermined voltage range, and outputs it to the A/D converter. do. Accordingly, it can be determined whether the power supply voltage output from the power supply device 200 is appropriate. A photodiode PD can determine whether the illuminance of the light emitted from the LED group is appropriate. Thermistor TH1 and thermistor TH2 can determine whether the temperature of the LED group is suitable.

The voltage-current exchange circuit is connected to the CPU 351-1 of the LED board 350-1 via the I/O port 359-1, and is capable of detecting an open error or the like.

Thermistor TH3 (which detects the temperature of the LED board) is connected to CPU 351-1 of LED board 350-1 via I/O port 359-1.

The range switching circuit has a plurality of selectable resistors, and switches the current range of the drive current by switching the resistance value according to the combination of resistors to be selected, thereby changing the illuminance range of the LED group (illuminance range). is configured to be changeable. For example, by connecting multiple resistors in series or in parallel and changing the combination of resistors to be selected, it is possible to switch the current range of the drive current and change the illuminance range (illuminance range) of the LED group. . The illuminance range can be switched by the operator operating the operation unit 207 (for example, the volume 270A and the switch 270B) of the power supply device 200. FIG.

The I/O port 359-1 is connected to the I/O port 359-2 of the next LED board 350-2, and is used when transmitting an address allocation command, which will be described later.

<<<Lighting Mode>>>
FIG. 6 is a timing chart of lighting by the LED group in lighting device 300 . The horizontal axis of the time chart shown in FIG. 6 is time (time) T, and the vertical axis is the illuminance of light emitted from the LED. The illumination device 300 is configured to always light the group of LEDs during inspection, and the example shown in FIG. . The operator can set the desired light emission brightness by operating the operation unit 207 (for example, the volume 270A) of the power supply device 200, and the illumination device 300 can be set according to the input set by the operator. The LED group is always lit with the brightness corresponding to the value. The brightness (illuminance) of the LED when it is lit is controlled by a control command sent from the CPU 201 of the power supply device 200 .

The lighting mode is a mode in which a DAC value is calculated according to an input value set by the operator in the power supply device 200, and the LED group of the lighting device 300 always outputs light with brightness (illuminance) corresponding to the DAC value. be. In the lighting mode, the LED group of lighting device 300 is controlled only by control commands transmitted from CPU 201 of power supply device 200 . The control command used in the lighting mode includes an input value corresponding to the brightness (illuminance) of light emitted from the LED group (0 to 3000 in full illumination mode, 0 to 1000 in other illumination modes), and is included in the command. Input values are stored in EEPROM 354 .

Specifically, when an operator sets an input value by operating the operation unit 207 (for example, volume 207A) of the power supply device 200, a command including the set input value is transmitted from the CPU 201 of the power supply device 200 to the lighting device 300. is transmitted to the CPU 351 of the LED board 350 of the . The CPU 351 of the LED board 350 stores the input value included in the received command in the EEPROM 354 . Based on the input value, the CPU 351 calculates a DAC value that matches the optical characteristics of the LED, and drives the LED with a drive current corresponding to the DAC value. light is emitted.

Commands transmitted from the CPU 201 of the power supply device 200 are input to the plurality of LED boards 350 (350-1, 350-2, 350-3, 350-4) of the lighting device 300 in parallel, in other words, simultaneously. Therefore, the CPUs 351 of the plurality of LED boards 350 can perform output control of the LED groups at the same timing.

<<<control processing of power supply device 200>>>
FIG. 7 is a flowchart of power supply control processing in power supply 200 . First, in step 702, the CPU 201 of the power supply device 200 determines whether or not to initialize.

When the operator operates the operation unit 207 to decide to initialize, the initialization is executed. For example, it can be determined that a menu setting process, which will be described later, is called to perform initialization.

In the case of Yes in step 702, in step 704, the CPU 201 of the power supply device 200 performs initialization processing. If No in step 702 , the process proceeds to step 706 .

In initialization processing (step 704 ), the CPU 201 of the power supply device 200 initializes information stored in the RAM 203 . Specifically, it initializes (restores to default) information (for example, a reception flag) indicating that an end command of the address allocation process described later has been received, and sends the initialization command to the CPU 351 of the LED board 350 of the lighting device 300. to send.

Next, in step 706, the CPU 201 of the power supply device 200 determines whether or not it stores that the CPU 351 of the LED board 350 has completed the address allocation process.

If No in step 706, that is, if the address allocation process of the CPU 351 of the LED board 350 has not ended, in step 708, the CPU 201 of the power supply device 200 determines the address for the CPU 351 of the LED board 350 to store the address number. A number allocation command is transmitted to the lighting device 300 .

If Yes in step 706 , that is, if the address allocation process of the CPU 351 of the LED board 350 has been completed, the process proceeds to step 710 .

Next, in step 710, the CPU 201 of the power supply device 200 has already received an address allocation processing end command from the CPU of the last LED board among the LED boards 350 (for example, the CPU 351-4 of the LED board 350-4). Determine whether or not there is

In the case of No in step 710, that is, when the address allocation processing of the CPUs 351 of all the LED boards 350 has not been completed, the processing of step 710 is repeated until the address allocation processing of the CPUs 351 of all the LED boards 350 is completed. stand by.

In the case of Yes in step 710 , that is, when the address allocation processing of the CPUs 351 of all the LED boards 350 is completed, the process proceeds to step 712 .

Next, at step 712, the CPU 201 of the power supply device 200 determines whether or not the operator has performed a menu operation.

In the case of Yes in step 712, in step 714, the CPU 201 of the power supply device 200 performs menu setting processing. If No in step 712 , the process proceeds to step 716 .

In the menu setting process, the CPU 201 of the power supply device 200 stores the operation result of the power supply device 200 by the operator in the EEPROM 204 . Specifically, the operator's operations include changing an input value, switching an illuminance range, and starting dimming adjustment, and the results of these operations are stored in the EEPROM 204 . By storing information about menu settings on the power supply side (EEPROM 204), the illumination device 300 can be restored to the previous settings when the power is turned on.

When the operator performs a menu operation such as inspection stop or inspection suspension, a command indicating that effect (inspection stop command, inspection suspension command, etc.) is transmitted to the illumination device 300 in the menu setting process.

When the operator operates the external device 100 to stop the inspection, the external device 100 transmits an inspection stop command to the power supply device 200, and the CPU 201 of the power supply device 200 sends the inspection stop command to the lighting device in the menu setting process. 300.

Next, in step 716, the CPU 201 of the power supply device 200 determines whether or not a menu operation has been performed and an operation to start dimming adjustment has been performed.

In the case of Yes in step 716, in step 1800, the CPU 201 of the power supply device 200 executes power supply side dimming adjustment processing, which will be described later.

If No in step 716 , the process proceeds to step 720 .

Next, in step 720, the CPU 201 of the power supply device 200 determines whether or not a menu operation has been performed to change the illuminance (change the input value).

In the case of Yes at step 720 , at step 722 , the CPU 201 of the power supply device 200 transmits an illuminance command, which will be described later, to the illumination device 300 .

If No in step 720 , the process proceeds to step 724 . The illuminance command indicates an input value, brightness, and intensity, but may be a command including which illuminance range it is.

Next, in step 724, the CPU 201 of the power supply device 200 determines whether or not a menu operation has been performed to switch the illuminance range.

In the case of Yes in step 724, in step 726, the CPU 201 of the power supply device 200 changes the illuminance range to the lighting device 300 (full illuminance mode, low illuminance mode, medium illuminance mode, high illuminance mode, which will be described later). Send command.

If No in step 724 , the process proceeds to step 728 .

By switching the illuminance range, the operator can set the LED group of the lighting device 300 to emit light within a desired illuminance range.

Next, at step 728 , the CPU 201 of the power supply device 200 performs command reception processing, and proceeds to the processing of step 730 .

In the command reception process, the CPU 201 of the power supply device 200 receives a command transmitted from the external device 100 or lighting device 300, and stores information in the RAM 203 or EEPROM 204 based on the received command.

Next, in step 730, the CPU 201 of the power supply device 200 performs error check processing.

In the error check process (step 730), the CPU 201 of the power supply device 200 checks communication with each CPU of the lighting device 300, checks for communication abnormality (power supply abnormality) in the power supply device 200, and the like.

Next, in step 732, the CPU 201 of the power supply device 200 performs display display processing, and returns to the processing of step 702 when the processing of step 732 ends.

In the display display processing, the CPU 201 of the power supply device 200 performs processing for displaying various information on the display 206 . Specifically, based on the operation result of the menu setting process, it displays the lighting mode, input value, intensity, etc., LED substrate temperature, error (LED temperature abnormality, open error, communication abnormality, etc.), etc. .

<<<Control Processing of Lighting Device 300>>>
<<Lighting control processing>>
FIG. 8 is a flowchart of lighting control processing in lighting device 300 . First, in step 902, the CPU 351 of the LED board 350 determines whether or not address allocation processing, which will be described later, has been completed.

If Yes in step 902 , that is, if the address allocation process has not yet been performed, in step 1100 the CPU 351 of the LED board 350 performs the address allocation process.

If No in step 902 , that is, if the address allocation process has already been performed, the process proceeds to step 904 .

Next, in step 904, the CPU 351 of the LED board 350 determines whether or not the dimming adjustment has been completed, that is, whether or not the lighting side dimming adjustment processing described later has been completed.

In the case of Yes in step 904, in step 1900, the CPU 351 of the LED board 350 performs illumination-side dimming adjustment processing.

When the process of step 1900 ends, the process proceeds to step 906 .

If No in step 904 , that is, if lighting-side dimming adjustment processing has already been performed, the process proceeds to step 906 .

Next, in step 906, the CPU 351 of the LED board 350 of the illumination device 300 performs command reception processing.

In the command reception process, CPU 351 of LED board 350 receives a command transmitted from CPU 201 of power supply device 200 . For example, the CPU 351 - 1 of the LED board 350 - 1 and the CPU 351 - 2 of the LED board 350 - 2 receive commands transmitted from the CPU 201 of the power supply device 200 . When the operator performs an inspection stop operation or an inspection suspension operation using the external device 100 or the power supply device 200 , the CPU 201 of the external device 100 or the power supply device 200 transmits an inspection stop command or an inspection suspension command, and the LED board 350 When the CPU 351 receives the inspection stop command, the CPU 351 performs a process of stopping or suspending the inspection. For example, the LED is turned off.

Next, at step 908, the CPU 351 of the LED board 350 determines whether or not to initialize, in other words, whether or not an initialization command has been received by the command reception process.

In the case of Yes in step 908, in step 910, the CPU 351 of the LED board 350 performs initialization processing, which will be described later. If No in step 908 , the process proceeds to step 914 .

In the initialization process (step 910 ), the CPU 351 of the LED board 350 initializes information stored in the RAM 353 . Specifically, the address numbers and the like in the address allocation process are initialized.

Next, in step 914, the CPU 351 of the LED board 350 determines whether or not an illuminance command has been received, in other words, whether or not the illuminance has been changed (brightness setting).

If Yes at step 914, at step 916, the CPU 351 of the LED board 350 stores the input value in the illuminance storage table of the EEPROM 354 based on the illuminance command. More specifically, the input value is stored according to the illuminance range.

If No in step 914 , the process proceeds to step 918 .

Next, at step 918, the CPU 351 of the LED board 350 determines whether or not an illuminance range command has been received, in other words, whether or not the illuminance range has been changed.

If Yes at step 918 , at step 920 , the CPU 351 of the LED board 350 performs illuminance range switching processing, which will be described later, and proceeds to step 922 . If No in step 918 , the process proceeds to step 922 .

In the illuminance range switching process, if the illuminance range command received in the command reception process is a command indicating the full illuminance mode, the CPU 351 of the LED board 350 changes the illuminance range to the full illuminance mode. If the range command is a command indicating low illumination mode, change the illumination range to low illumination mode, and if the illumination range command received in the command reception process indicates medium illumination mode, change the illumination range to medium illumination mode. If the illuminance range command received in the command reception process indicates the high illuminance mode, the illuminance range is changed to the high illuminance mode.

Next, in step 921, DAC value calculation processing, which will be described later, is executed. In the DAC value calculation process, the DAC value is calculated using the input value corresponding to the set illuminance range. As described above, the input value range (0 to 3000) in full illumination mode and the input value range (0 to 1000) in other illumination modes (low illumination mode, medium illumination mode, high illumination mode) different. Therefore, the default input value when the full illumination mode is changed to another illumination mode is set to ⅓ of the input value set in the full illumination mode. Conversely, the default input value when changing from another illumination mode to the full illumination mode is three times the input value set in the other illumination mode.

By doing so, even if the range of input values differs between the full illumination mode and the other lighting modes, the rotatable range of the volume 207A can be kept constant.

Next, in step 922, the CPU 351 of the LED board 350 reads the information stored in the EPPROM 354 and performs LED output processing (irradiation control).

Next, at step 2400, the CPU 351 of the LED board 350 performs error check processing, which will be described later.

Next, at step 924 , CPU 351 of LED board 350 executes command transmission processing for transmitting a command to CPU 201 of power supply device 200 . For example, LED temperature error information or the like is transmitted.

Next, in step 926, the CPU 351 of the LED board 350 determines whether or not to end the inspection, that is, whether or not the operator has operated the external device 100 or the power supply device 200 to end the inspection. It is determined whether or not the inspection of the object to be inspected has been completed.

In the case of Yes in step 926, in step 928, the CPU 351 of the LED board 350 executes inspection termination processing (for example, turning off the LED, etc.) and terminates the inspection.

If No in step 926 , the process proceeds to step 906 .

<<Overview of Address Allocation Process>>
Next, an outline of address allocation processing will be described with reference to FIG. In order to identify the LED groups mounted on the LED board 350 of the lighting device 300, the address allocation process is performed by the CPU 351 of the LED board 350 on which the respective LED groups are mounted to register ( memory). The address allocation process starts each time the power supply device 200 and the lighting device 300 are activated. When powered on, the power supply device 200 transmits to the lighting device 300 an address number allocation command for the lighting device 300 to start address allocation processing. When the CPU 351 of the LED board 350 of the illumination device 300 receives the address number allocation command, it executes the address allocation process. The CPUs of the plurality of LED boards of the illumination device 300 are configured to receive address allocation commands in a predetermined order and execute address allocation processing in a predetermined order.

The illumination device 300 is provided with a command line CL, and a command transmitted from the CPU 201 of the power supply device 200 (not shown) is sent to the LED substrate 350 via the end substrates (310, 320) by the command line CL. It can be input to the CPU 351 . The CPU 351 of the LED board 350 can send commands through the command line CL. As shown in FIG. 5, a control signal (pulse signal) line PL is provided, and the control signal output from the CPU 201 of the power supply device 200 is transmitted through the end substrates (310, 320) by the control signal line PL. is input to the CPU 351 of the LED board 350 . A waveform shaping circuit (for example, a Schmidt buffer) may be provided on the control signal line PL to stabilize the waveform of the control signal.

Ports 1 and 2 of the I/O ports 359 of adjacent LED boards 350 are connected. For example, port 2 of I/O port 359-1 on LED board 350-1 is connected to port 1 of I/O port 359-2 on LED board 350-2.

Port 2 of the I/O port 359 of the LED board 350 functions as an input port at startup. Port 2 of the I/O port 359 of the LED board 350 functions as an output port after receiving the address number allocation command.

The command line CL is connected in parallel to the LED boards 350-1 to 350-4. Although it is possible to receive them at the same time, only the CPU 351 of the LED board 350 whose port 1 of the I/O port 359 of the LED board 350 is at LOW level receives the address allocation command.

After receiving the address allocation command, the CPU 351-1 of the LED board 350-1 updates the address allocation command and outputs it to the command line CL. The output address allocation command is received by the CPU of another LED board (the CPU of the LED board different from the CPU 351-1 of the LED board 350-1) that has determined that the port 1 is at the LOW level. For example, when the CPU 351-2 of the LED board 350-2 determines that the port 1 is at LOW level, the CPU 351-2 of the LED board 350-2 receives the address allocation command. After receiving the address allocation command, the CPU 351-2 of the LED board 350-2 updates the address allocation command and outputs it to the command line CL. The same applies to the CPUs of the subsequent LED substrates.

In other words, the address allocation command transmitted from the power supply device 200 is received by the CPU of the LED board that has not yet received the command, and the CPU of the LED board that received the address allocation command stores and updates the address allocation command, and then An address allocation command is output to the command line so that the CPU of another LED board that has not yet received one can receive it.

Specifically, at startup, the port 1 of the I/O port 359-1 of the LED board 350-1 is connected to the end board 310, and the port 1 is at the LOW level. Receivable.

Port 1 of the I/O ports (359-2, 359-3, 359-4) of the other LED boards (350-2, 350-3, 350-4) is the I/O port of the previous LED board. It is connected to port 2 of ports (359-1, 359-2, 359-3), but since it is at HIGH level due to the control voltage (example: 5V), it is unable to receive the address allocation command. there is

In this way, when starting up, the CPU 351-1 of the LED board 350-1 connected to the end board 310 must first receive the address number allocation command transmitted from the CPU 201 of the power supply 200 via the command line CL. is configured to

When the CPU 351-1 of the LED board 350-1 receives the address number allocation command, the CPU 351-1 of the LED board 350-1 calculates the number of LED groups (such as 2), the address is registered (for example, 0, 1 is registered), the initial value of the address is added (for example, +2) according to the number of LED groups, and the initial value of the address is updated ( For example, an address number allocation command with an initial value of 2 is transmitted.

When the address is registered, the CPU 351-1 of the LED board 350-1 changes the port 2 of the I/O port 359-1 from HIGH level to LOW level and then adds the address (for example, +2) to obtain the address number. An allocation command is sent to the CPU 351-2 of the next LED board 350-2.

When the CPU 351-1 of the LED board 350-1 changes the port 2 of the I/O port 359-1 from HIGH level to LOW level, the port 1 of the I/O port 359-2 of the LED board 350-2 goes LOW. Since the level is reached, the CPU 351-2 of the LED board 350-2 can receive the next address number allocation command.

Similarly, the CPU 351-2 of the LED board 350-2, the CPU 351-3 of the LED board 350-3, and the CPU 351-4 of the LED board 350-4 register the address numbers. When the CPU 351-4 of the LED board 350-4, which is the CPU of the last LED board, completes the registration of the address number, the port 2 of the I/O port 359-4 of the LED board 350-4 is connected to the end board 320. Since it is connected, it is at LOW level from the beginning and cannot be changed from HIGH level to LOW level.

In other words, the CPU 351-4 of the LED board 350-4 connected to the end board 320 can recognize that the LED board 350 is no longer connected, and sends the end command of the address allocation process to the power supply device 200. Send to

In this way, regardless of the connection direction between the power supply device 200 and the lighting device 300, that is, whether the connector 20 of the lighting device 300 and the power supply device 200 are connected or the connector 21 of the lighting device 300 and the power supply device 200 are connected. Whether or not they are connected, LED board 350-1 can be the first LED board 350 and LED board 350-4 can be the last LED board 350 to control a group of LEDs. As a result, the number of wires can be reduced, and the cables can be thinner. Furthermore, wiring in lighting device 300 can be easily routed.

The numerical value to be added may be changed according to the number of LED groups mounted on the LED board 350. For example, when three LED groups are mounted on the LED board 350, the numerical value to be added is set to 3. may

<<Address allocation process>>
Next, FIG. 10 is a flowchart of address allocation processing. First, at step 1102, the CPU 351 of the LED board 350 receives an address number allocation command.

Next, at step 1104, the CPU 351 of the LED board 350 determines whether port 1 of the I/O port 359 is at LOW level. If No in step 1104, the processing of step 1102 is performed again.

If Yes at step 1104 , at step 1106 , the CPU 351 of the LED board 350 stores the initial value of the address number indicated by the address number allocation command in the RAM 353 as the address number of the LED group of the LED board 350 .

Since the CPU 351 of the LED board 350 stores the address number in the RAM 353, the stored address number is cleared when the power is turned off. That is, the CPU 351 of the LED board 350 stores the address number in the RAM 353 each time it is activated.

Therefore, even if one of the LED boards 350 fails and the failed LED board 350 is replaced, only the failed LED board 350 can be easily replaced because the address number is stored at startup. Further, since the DAC value is also stored on the lighting device 300 side, even if the power supply device 200 is replaced, the data (address number, DAC value, etc.) on the lighting device 300 side is not changed, and the power supply device 200 can be replaced. Even in the case of replacement, the replacement work can be performed simply and quickly.

Next, at step 1108, the CPU 351 of the LED board 350 determines whether port 2 of the I/O port 359 is at HIGH level.

If Yes at step 1108, at step 1110, the CPU 351 of the LED board 350 changes the port 2 of the I/O port 359 to LOW level.

Next, in step 1112, the CPU 351 of the LED board 350 adds the initial value of the address number of the address number allocation command and transmits the address number allocation command.

As previously mentioned, the number added in step 1112 can be configured to be based on the number of LED groups. For example, when two LED groups (eg, LED-a and LED-b) are provided on one LED board 350, +2 is provided, and one LED board 350 has three LED groups (eg, LED-a , LED-b, and LED-c) are provided, +3.

If No at step 1108 , at step 1114 , the CPU 351 of the LED board 350 transmits an end command indicating that the address allocation process has ended to the CPU 201 of the power supply device 200 .

When the processing of steps 1112 and 1114 ends, the process returns to the caller.

As described above, in the address allocation process of step 1100, the CPU of each LED board is configured to receive the address allocation command when it determines that port 1 is at the LOW level. do not have. For example, the CPU of each LED board may be configured to receive the output address allocation command and update the address number using the received address allocation command only when the port 1 is at LOW level.

<<Summary of address allocation processing>>
<Parallel connection of command line CL>
A command line CL of the illumination device 300 is connected in parallel to each LED board 350 . Therefore, all of the LED boards 350 can simultaneously receive commands issued from the power supply device 200 via the command line CL.

<Series connection by connecting ports>
Further, in the lighting device 300, by connecting the port 1 of one LED board 350 and the port 2 of the other LED board 350 of two adjacent LED boards 350 among the plurality of LED boards 350, the plurality of LED boards connected in series.

<Allocation of address numbers>
When receiving the address allocation command, the CPU of the first LED board 350 (allocation permitted state LED board) whose port 1 is at LOW level allocates an address number to the first LED board 350 (self). Next, the CPU of the first LED board 350 changes the port 2 to LOW level, updates the address number according to the number of LED groups, and sends an address allocation command indicating the updated address number to the command line CL. Output. By changing the port 2 of the first LED board 350 to LOW level, the port 1 of the second LED board 350, which is connected to the adjacent ports, is changed to LOW level. That is, the second LED board 350 is changed from the allocation prohibited state to the allocation permitted state. Therefore, the second LED board 350 allocates an address to the second LED board 350 when receiving the address allocation command output from the first LED board 350 to the command line CL.

The second LED board 350 similarly changes the port 2 to LOW level, updates the address number according to the number of LED groups, and outputs an address allocation command indicating the updated address number to the command line CL. do. By doing so, the updated address numbers can be assigned to the third LED boards 350 that are adjacent to each other by connecting the ports.

In this manner, the LED boards 350 in the allocation-permitted state change the allocation-prohibited LED boards 350 whose ports are connected to each other to the allocation-permitted state, update the address numbers, and output them to the command line CL. When the LED board 350 in allocation permission state receives the address number, it allocates the address number to itself. In this manner, address numbers can be sequentially assigned to the plurality of LED boards 350 .

Next, the CPU of the LED board whose port 1 is at LOW level similarly receives the address allocation command. An LED board whose port 1 is at LOW level is an LED board having port 1 connected to port 2 of the LED board that outputs the address allocation command as described above. Therefore, port 1 of each LED board is changed to LOW level in turn, and an address number is assigned to each LED group.

<<<illuminance detection system>>>
Next, an outline of the illuminance detection system will be described with reference to FIG. 11(a). In FIG. 11(a), the dashed line indicates a partially broken side view of the illumination device 300 as viewed from the side 33 side, and the illuminance detection system as a whole is shown as a block diagram. First, the illuminance detection system is a system installed at an inspection site for shipment inspection of the manufacturer of the lighting device 300, and is used to make the illuminance error between the LED groups of the lighting device 300 uniform as much as possible. This is the system used to ship the 300.

The illuminance detection system includes a PC 500 (for example, a personal computer), an illuminance detection device 600 , a power supply device 200 and an illumination device 300 .

The illuminance detection device 600 includes an illuminance detection section 700 . The illuminance detection unit 700 can detect the illuminance of the LED group of the illumination device 300, and includes a light receiving element (for example, a photodiode) for receiving light emitted from the LEDs. The illuminance detection unit 700 is arranged above the illumination device 300 and is configured to be movable along the irradiation unit 10 of the illumination device 300 . Illuminance detection unit 700 is configured to be movable at a certain height above illumination device 300 .

The light receiving element of the illuminance detection unit 700 is arranged facing the irradiation unit 10 of the illumination device 300 . The light receiving element outputs a signal indicating the intensity of the received light to the PC 500 . The PC 500 can identify the position of the illuminance detection unit 700 by receiving a signal indicating the intensity of light received by the light receiving element.

The PC 500 can be operated by an operator (for example, the manufacturer of the lighting device), instructs to start or stop inspection, receives detection information from the illuminance detection unit 700, controls the illuminance detection device 600, controls the illuminance detection device 600, commands are sent and received.

The power supply device 200 transmits to the lighting device 300 commands corresponding to commands related to inspection received from the PC 500 , and transmits commands corresponding to commands received from the lighting device 300 to the PC 500 .

The CPU 351 of the LED board 350 of the lighting device 300 controls the light emission of the LED group (LED-a 356a, LED-b 356b) according to the command received from the power supply device 200, registers the DAC value corresponding to the predetermined light emission brightness, and the like. I do.

Illuminance detection device 600 is controlled based on instructions from PC 500 .

<< Illuminance detection system perspective view >>
Next, the relationship between the lighting device 300 and the illuminance detection unit 700 in the illuminance detection system will be described with reference to FIG. 11(b).

The illuminance detection unit 700 is arranged parallel to the longitudinal direction of the illumination device 300 .

The illumination device 300 irradiates the light emitted from the LED from the irradiation unit 10 in the vertical direction.

As described above, the illuminance detection unit 700 can be translated in the longitudinal direction of the illumination device 300 . Light emitted from the LED of the illumination device 300 is received by moving in parallel. The illuminance detection unit 700 is arranged in the illuminance detection device 600 at a position where light emitted from the LED of the lighting device 300 is easily received (at a predetermined distance from the lighting device 300).

<<<Overview of equalization of illuminance>>>
If the CPU 351 of the LED board 350 instructs the LED group to emit light with a predetermined DAC value (for example, 4095) and simply causes the LED group to emit light, the illuminance varies due to individual differences in the LEDs. Therefore, in this embodiment, the CPU 351 of the LED board 350 sets the brightness to 100% (for example, the illuminance and brightness values (hereinafter referred to as , referred to as the reference illumination value) is 30000), the intensity is 50% (for example, the reference illumination value is 15000), and the intensity is 1% (for example, the reference illumination value is 300). A DAC value corresponding to intensity is calculated using a function based on these values. Here, the intensity of the brightness of the light emitted from the LED is shown as a ratio of 0 to 100%.

The unit of the reference illuminance value may be determined as appropriate, such as lx (lux) or cd (candela). The DAC value is a digital value, for example, a value such as 0-4095. The DAC value corresponding to 100% intensity may differ depending on the optical characteristics of the LEDs in the LED group, etc. In one LED group, the DAC value corresponding to 100% intensity is 4095, and in another LED group , the DAC value corresponding to 100% intensity may be 4094. When the input value (0 to 1000) is set to 1000, all the LED groups are configured to output at 100% intensity. As described above, the range of input values may vary depending on the illuminance range. In mode, the range of input values is 0-1000.

<<Specific example of setting process for 100%>>
Next, FIG. 12 shows that the CPU 351 of the LED board 350 controls the LED group (LED-a 356a, LED-a 356a, LED- b356b) is a specific example of the process of storing in the EEPROM 354 the DAC value at which the intensity is 100% (the reference illuminance value is 30000).

FIG. 12A shows an LED group (LED-a 356a , LED-b 356b).

The detection value of the illuminance detection unit 700 is 30030 for the LED-a356a-1 on the LED board 350-1, 30010 for the LED-b356b-1 on the LED board 350-1, and 30000 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 30050, the LED-a 356a-3 of the LED board 350-3 is 30040, and the LED-b 356b-3 of the LED board 350-3 is 30030. In this way, when the LED is simply caused to emit light by instructing it to emit light with a DAC value of 4095, the illuminance varies due to individual differences in the LEDs. The LED-a 356a-4 and LED-b 356b-4 of the LED board 350-4 are omitted from the illustration. Similarly, the LED-a 356a-4 and the LED-b 356b-4 of the LED board 350-4 are omitted from the following description.

The PC 500 compares the illuminance of the LED group on the LED board 350 (the value detected by the illuminance detection unit 700) and stores the lowest value (here, 30000) as the reference illuminance value of 100% illuminance. Then, as the DAC value for the CPU (CPU 351-2) of the LED board that controls the LED group (here, LED-a 356a-2 of LED board 350-2) with the lowest value to emit light at 100% intensity, A registration command is transmitted to register the current DAC value (4095), and the CPU (CPU 351-2) that receives the registration command registers 4095 as the DAC value corresponding to 100% brightness.

Next, in order to register the DAC value of 100% brightness other than the LED group with the lowest value (here, LED-a356a-2 of LED board 350-2), PC500 subtracts 1 from the DAC value and LED Send a DAC value command to light the group.

FIG. 12B shows an LED group (LED-a 356a, LED-b 356b ) shows the illuminance (detected value).

The detection value of the illuminance detection unit 700 is 30000 for the LED-a356a-1 on the LED board 350-1, 29980 for the LED-b356b-1 on the LED board 350-1, and 29970 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 30020, the LED-a 356a-3 of the LED board 350-3 is 30010, and the LED-b 356b-3 of the LED board 350-3 is 30000.

The PC 500 determines whether or not there is an LED group whose illuminance is equal to or lower than 30000 stored as the reference illuminance value. Here, three LED-a 356a-1 on the LED board 350-1, LED-b 356b-1 on the LED board 350-1, and LED-b 356b-3 on the LED board 350-3 are the same as the reference illuminance value or the reference illuminance Since it fell below the value, the current , and the CPU that receives the registration command registers 4094 as the 100% DAC value.

FIG. 12C shows the LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 29950 for the LED-a356a-1 on the LED board 350-1, 29960 for the LED-b356b-1 on the LED board 350-1, and 29950 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 29990, the LED-a 356a-3 of the LED board 350-3 is 29980, and the LED-b 356b-3 of the LED board 350-3 is 29970.

The PC 500 determines whether or not there is an LED group whose illuminance is equal to or lower than 30000 stored as the reference illuminance value. Here, since two of the LED-b356b-2 of the LED board 350-2 and the LED-a356a-3 of the LED board 350-3 are below the reference illuminance value, the brightness of the LED-b356b-2 is sent to the CPU 351-2 As a DAC value of 100%, a registration command for registering the current DAC value of LED-a 356a-3 as a DAC value of 100% intensity of LED-a 356a-3 is transmitted to CPU 351-3. 4093 is registered as the DAC value of .

In this way, the DAC value is decremented by 1, and when the DAC value of 100% intensity is registered in the EEPROM 354 for all the LED groups (LED-a 356a, LED-b 356b) of the LED board 350, the DAC value for 100% is registered. The setting process is completed.

<<Specific example of setting process for 50%>>
Next, FIG. 13 shows that the CPU 351 of the LED board 350 controls the LED group (LED-a 356a, LED-a 356a, LED- b356b) is a specific example of the process of storing in the EEPROM 354 the DAC value at which the intensity is 50% (the reference illuminance value is 15000).

In the 50% setting process, 15000, which is half the reference value of 30000 in the 100% setting process, is set as the reference illuminance value. In the 50% setting process, illuminance detection is started from a DAC value (here, DAC value 2050) slightly above half of the maximum DAC value 4095. FIG. By doing so, even if there is an error in the illuminance due to individual differences in the LEDs, the illuminance can be appropriately detected and the DAC value can be registered.

FIG. 13A shows an LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 15120 for the LED-a356a-1 on the LED board 350-1, 15070 for the LED-b356b-1 on the LED board 350-1, and 15090 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 15140, the LED-a 356a-3 of the LED board 350-3 is 15120, and the LED-b 356b-3 of the LED board 350-3 is 15130.

The PC 500 determines whether or not there is a group of LEDs whose brightness is equal to or lower than the reference illuminance value (here, 15000) of 50% brightness. Here, since none of them are equal to or less than the reference illuminance value, the CPU 351 of none of the LED boards 350 does not register the DAC value.

Next, the PC 500 transmits a DAC value command to decrement the DAC value by 1 and emit light.

FIG. 13B shows an LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 15090 for the LED-a356a-1 on the LED board 350-1, 15030 for the LED-b356b-1 on the LED board 350-1, and 15060 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 15110, the LED-a 356a-3 of the LED board 350-3 is 15100, and the LED-b 356b-3 of the LED board 350-3 is 15110.

The PC 500 determines whether or not there is an LED group whose illuminance value is equal to or lower than 15000 stored as the reference illuminance value. Here, since none of them are equal to or less than the reference illuminance value, neither the CPU 351 of any of the LED boards 350 registers the DAC value.

FIG. 13C shows the LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 15060 for the LED-a356a-1 on the LED board 350-1, 15000 for the LED-b356b-1 on the LED board 350-1, and 15030 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 15080, the LED-a 356a-3 of the LED board 350-3 is 15070, and the LED-b 356b-3 of the LED board 350-3 is 15080.

The PC 500 determines whether or not there is an LED group whose illuminance value is equal to or lower than 15000 stored as the reference illuminance value. Here, since the LED-b356b-1 of the LED board 350-1 is the same as the reference illuminance value, the current DAC value is registered in the CPU 351-1 as the DAC value of the brightness of LED-b356b-1 at 50%. The CPU that has received the registration command registers 2048 as the 50% DAC value.

FIG. 13D shows the LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 15030 for the LED-a356a-1 on the LED board 350-1, 14970 for the LED-b356b-1 on the LED board 350-1, and 15000 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 15050, the LED-a 356a-3 of the LED board 350-3 is 15040, and the LED-b 356b-3 of the LED board 350-3 is 15050.

The PC 500 determines whether or not there is an LED group whose illuminance value is equal to or lower than 15000 stored as the reference illuminance value. Here, since the LED-a 356a-2 of the LED board 350-2 is the same as the reference illuminance value, the current DAC value is registered in the CPU 351-2 as the DAC value of the brightness of LED-a 356a-2 of 50%. The CPU that has received the registration command registers 2047 as the 50% DAC value.

In this way, the DAC value is decremented by 1, and when the DAC value of 50% is registered in the EEPROM 354 for all the LED groups (LED-a 356a, LED-b 356b) of the LED board 350, setting processing for 50% is performed. is completed.

<<Specific example of setting process for 1%>>
Next, in FIG. 14, the CPU 351 of the LED board 350 controls the LED group (LED-a 356a, LED-a 356a, LED- b356b) is a specific example of the process of storing in the EEPROM 354 the DAC value at which the intensity is 1% (the reference illuminance value is 300).

In the 1% setting process, 300, which is 1% of the 100% set reference illuminance value 30000, is set as the reference illuminance value. With the 1% setting, the detection of illuminance is started from a DAC value slightly above 1% of the maximum DAC value 4095 (DAC value 44 here). By doing so, even if there is an error in the illuminance due to individual differences in the LEDs, the illuminance can be appropriately detected and the DAC value can be registered.

FIG. 14A shows an LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 410 for the LED-a356a-1 on the LED board 350-1, 380 for the LED-b356b-1 on the LED board 350-1, and 390 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 430, the LED-a 356a-3 of the LED board 350-3 is 440, and the LED-b 356b-3 of the LED board 350-3 is 380.

The PC 500 determines whether or not there is a group of LEDs whose brightness is equal to or lower than the reference illumination value (here, 300) of 1% brightness. Here, since none of them are equal to or less than the reference illuminance value, the CPU 351 of none of the LED boards 350 does not register the DAC value.

Next, the PC 500 transmits a DAC value command to decrement the DAC value by 1 and emit light.

FIG. 14B shows the LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 380 for the LED-a356a-1 of the LED board 350-1, 350 for the LED-b356b-1 of the LED board 350-1, and 360 for the LED-a356a-2 of the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 400, the LED-a 356a-3 of the LED board 350-3 is 410, and the LED-b 356b-3 of the LED board 350-3 is 350.

The PC 500 determines whether or not there is a group of LEDs whose brightness is equal to or lower than the reference illumination value (here, 300) of 1% brightness. Here, since none of them are equal to or less than the reference illuminance value, neither the CPU 351 of any of the LED boards 350 registers the DAC value.

Next, the PC 500 transmits a DAC value command to decrement the DAC value by 1 and emit light.

FIG. 14C shows an LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 350 for the LED-a356a-1 on the LED board 350-1, 320 for the LED-b356b-1 on the LED board 350-1, and 330 for the LED-a356a-2 on the LED board 350-2. , LED-b 356b-2 of the LED board 350-2 is 370, LED-a 356a-3 of the LED board 350-3 is 380, and LED-b 356b-3 of the LED board 350-3 is 320.

The PC 500 determines whether or not there is a group of LEDs whose brightness is equal to or lower than the reference illumination value (here, 300) of 1% brightness. Here, since none of them are equal to or less than the reference illuminance value, neither the CPU 351 of any of the LED boards 350 registers the DAC value.

Next, the PC 500 transmits a DAC value command to decrement the DAC value by 1 and emit light.

FIG. 14D shows an LED group (LED-a 356a, LED-b 356b ).

The detection value of the illuminance detection unit 700 is 320 for the LED-a356a-1 on the LED board 350-1, 290 for the LED-b356b-1 on the LED board 350-1, and 300 for the LED-a356a-2 on the LED board 350-2. , the LED-b 356b-2 of the LED board 350-2 is 340, the LED-a 356a-3 of the LED board 350-3 is 350, and the LED-b 356b-3 of the LED board 350-3 is 290.

The PC 500 determines whether or not there is a group of LEDs whose brightness is equal to or lower than the reference illumination value (here, 300) of 1% brightness. Here, since the LED-b 356b-1 of the LED board 350-1, the LED-a 356a-2 of the LED board 350-2, and the LED-b 356b-3 of the LED board 350-3 are equal to or less than the reference illuminance value, the CPU 351 -1 to LED-b 356b-1 as a DAC value of 1% intensity, to CPU 351-2 as a DAC value of LED-a 356a-2 to 1% intensity, to CPU 351-3 LED-b 356b-3 intensity of 1 A registration command for registering the current DAC value as the DAC value of 1% is transmitted, and the CPU that receives the registration command registers 41 as the DAC value of 1% brightness.

In this way, the DAC value is decremented by 1, and when the DAC value of 1% is registered in the EEPROM 354 for all the LED groups (LED-a 356a, LED-b 356b) of the LED board 350, setting processing for 1% is performed. is completed.

<<<PC side control processing (control processing of PC 500) >>>
Next, FIG. 15 is a flowchart of PC-side control processing performed by the PC 500. As shown in FIG. First, in step 1602, the PC 500 executes start processing related to illuminance detection when an operation to start illuminance detection is performed. Specifically, processing such as initialization of the RAM of the PC 500 and transmission of a command for causing the LED to emit light with the maximum DAC value (4095 in this example) to the power supply device 200 is performed.

Next, at step 1604 , the PC 500 executes illuminance detection unit movement control processing for moving the illuminance detection unit 700 . That is, the illuminance detector 700 is moved to detect the illuminance of all the LED groups at a predetermined DAC value of 1. The movement distance of the illuminance detection unit 700 is a predetermined distance, and may be the length of one LED group. The moving speed is sufficient as long as the illuminance of one LED group can be detected. It may be configured such that the illuminance of all the LED groups is detected in one movement control, the illuminance is detected in the forward trip, and only the return trip returns to the initial position in one movement.

Next, at step 1606, the PC 500 executes command reception processing.

In the command reception process, a detection value command indicating the illuminance of each LED group is received from the illuminance detection unit 700, a 100% adjustment completion command, a 50% adjustment completion command, a 1% adjustment completion command, etc., which will be described later, are received from the power supply device 200. I do. A 100% adjustment complete command, a 50% adjustment complete command, and a 1% adjustment complete command are completed when the CPU 351 of the LED board 350 completes registration of the DAC values in each adjustment stage (100%, 50%, and 1% in this example). This is the command to send when

Next, at step 1608, the PC 500 stores the illuminance indicated by the received detection value command in the RAM.

Next, at step 1610, the PC 500 determines whether or not the storage of the illuminance at the DAC value of 1 has been completed. More specifically, it is determined whether or not the illuminance of all LED groups at a predetermined DAC value of 1 has been stored in the RAM. If No in step 1610 , return to step 1604 . In other words, by the processing of steps 1604 to 1610, the illuminance of all the LED groups mounted on the LED board of lighting device 300 at a DAC value of 1 can be detected.

If Yes at step 1610, at step 1612, the PC 500 determines whether the CPU 351 of the LED board 350 has registered 100% DAC values for each LED group. In other words, the PC 500 determines whether or not a 100% adjustment completion command corresponding to each LED group has been received from the CPU (351-1, 351-2, 351-3, 351-4) of each LED board.

If No in step 1612, in step 1710, the PC 500 executes 100% setting processing, which will be described later.

When the processing of step 1710 ends, in step 1624, the PC 500 subtracts 1 from the current DAC value to obtain a new DAC value.

Next, at step 1626, PC 500 transmits to power supply 200 a DAC value command indicating the new DAC value. Although details will be described later, the power supply device 200 transmits a DAC value command to the lighting device 300 .

When the process of step 1626 ends, the process returns to step 1604 .

In this way, in order to detect the illuminance based on the new DAC value, steps 1604 to 1610 are repeated until the detection of the illuminance of all the LED groups is completed for the DAC value of 1, and the PC 500 reaches the DAC value of 1. On the other hand, when the illuminance of all LED groups is stored, the process proceeds to step 1612 . If the CPUs 351 of all the LED boards 350 have not finished registering the 100% DAC value of each LED group, the DAC value is decremented by -1. By repeating these processes, the CPUs 351 of all the LED boards 350 can register the 100% DAC value of each LED group.

Next, if Yes at step 1612, at step 1614, the PC 500 determines whether the CPU 351 of the LED board 350 has registered the 50% DAC value of each LED group. In other words, the PC 500 determines whether or not a 50% adjustment completion command corresponding to each LED group has been received from the CPU (351-1, 351-2, 351-3, 351-4) of each LED board.

If No at step 1614, at step 1720, the PC 500 executes a 50% setting process, which will be described later.

When the process of step 1720 is completed, in step 1624, PC 500 subtracts 1 from the current DAC value to make it a new DAC value, and in step 1626, PC 500 sets the new DAC value to A DAC value command indicating the value is sent to power supply 200, and the process returns to step 1604. FIG.

In this way, in order to detect the illuminance based on the new DAC value, steps 1604 to 1610 are repeated until the detection of the illuminance of all the LED groups is completed for the DAC value of 1, and the PC 500 reaches the DAC value of 1. On the other hand, when the illuminance of all LED groups is stored, the process proceeds to step 1612 . If the CPUs 351 of all the LED boards 350 have already registered the 100% DAC values of each LED group, the process proceeds to step 1614, and the CPUs 351 of all the LED boards 350 must have finished registering the 50% DAC values of each LED group. If so, the 50% setting process of step 1720 is performed, the DAC value is decremented by 1, and the process returns to step 1604 . By repeating these processes, the CPUs 351 of all the LED boards 350 can register the 50% DAC value of each LED group.

Next, if Yes at step 1614, at step 1616, the PC 500 determines whether the CPU 351 of the LED board 350 has registered the 1% DAC value of each LED group. In other words, the PC 500 determines whether a 1% adjustment completion command corresponding to each LED group has been received from the CPU (351-1, 351-2, 351-3, 351-4) of each LED board.

If No at step 1616, at step 1730, the PC 500 executes a 1% setting process, which will be described later.

When the process of step 1730 ends, the PC 500 subtracts 1 from the current DAC value to create a new DAC value, in step 1626 PC 500 transmits a DAC value command indicating the new DAC value to power supply device 200 and returns to the process of step 1604 .

In this way, in order to detect the illuminance based on the new DAC value, steps 1604 to 1610 are repeated until the detection of the illuminance of all the LED groups is completed for the DAC value of 1, and the PC 500 reaches the DAC value of 1. On the other hand, when the illuminance of all LED groups is stored, the process proceeds to step 1612 . If the CPUs 351 of all the LED boards 350 have already registered the 100% DAC value and the 50% DAC value of each LED group, the process proceeds to step 1616, and the CPUs 351 of all the LED boards 350 register the 1% DAC value of each LED group. If the registration has not been completed, the 1% setting process of step 1730 is performed and the DAC value is decremented by -1. By repeating these processes, the CPUs 351 of all the LED boards 350 can register the 1% DAC value of each LED group.

Next, if Yes at step 1616, at step 1618, the PC 500 executes illuminance range confirmation processing, which will be described later.

In the illuminance range confirmation process, the PC 500 confirms the illuminance range in which the DAC value has been registered, and then switches the illuminance range for registering the DAC value in the order of full illuminance mode→high illuminance mode→medium illuminance mode→low illuminance mode. processing. That is, when the 100% DAC value, 50% DAC value, and 1% DAC value are registered in each illuminance range, the 100% DAC value, 50% DAC value, and 1% DAC value in the next illuminance range are registered. Switch the illuminance range for registering the DAC value.

When the illuminance range is switched, the PC 500 transmits a corresponding illuminance range change command to the power supply device 200, so the power supply device 200 (and the lighting device 300) must understand that the illuminance range is switched by the illuminance range change command. is possible.

Next, at step 1620, the PC 500 determines whether or not the adjustment completion command for all LED groups has been received.

If No in step 1620 , go to step 1604 .

If Yes in step 1620, end processing is executed in step 1622, and the PC side control processing ends. Specifically, in the end processing, processing such as returning the illuminance detection unit 700 to the initial position and turning off the LED is performed.

In this example, the illuminance of all the LED groups at a DAC value of 1 is detected by controlling the movement of the illuminance detection unit 700 once, but the detection method is not limited to this. For example, the illuminance may be detected for each LED group so as not to detect light from adjacent LED groups. In other words, when detecting the illuminance of one LED group, only one LED group that detects the illuminance is turned on, and the other LED groups are turned off, so that the illuminance is detected in a state where stray light does not occur. may

Next, FIG. 16 is a flowchart of 100% setting processing, 50% setting processing, and 1% setting processing.

<Setting processing for 100%>
FIG. 16(a) is a subroutine of the 100% setting process (step 1710) in FIG. First, at step 1712, the PC 500 determines whether or not the 100% LED output has started, in other words, whether the DAC value command for the 100% setting process (here, the maximum DAC value of 4095) has been transmitted. Determine whether or not

If No at step 1712, at step 1714, the PC 500 sets a DAC value (here, DAC value 4096 because the DAC value is decremented by -1 at step 1624) for the maximum DAC value (4095).

If Yes in step 1712 , go to step 1716 .

Next, at step 1716, the PC 500 determines whether or not there is an LED group whose illuminance has reached the reference value. Specifically, based on the detection value command received from the illuminance detection unit 700, it is determined whether or not the illuminance detection value of each LED group stored in the RAM has reached a reference value.

If Yes at step 1716, at step 1718, the PC 500 transmits a registration instruction command for registering the current DAC value by the CPU of the LED group that has reached the reference value.

After step 1718 or if No in step 1716, return to the caller.

<Setting processing for 50%>
FIG. 16(b) is a subroutine of the 50% setting process (step 1720) of FIG. First, at step 1722, the PC 500 determines whether or not the 50% LED output has started, in other words, whether or not the DAC value command for the 50% setting process has been transmitted.

If No in step 1722, in step 1724 the PC 500 sets a DAC value slightly above half of the maximum DAC value (here 4095) (here DAC value 2051 because step 1624 decrements the DAC value by -1). do.

If Yes at step 1722 , go to step 1726 .

Next, at step 1726, the PC 500 determines whether there is an LED group whose illuminance has reached the reference value.

If Yes at step 1726, at step 1728, the PC 500 transmits a registration instruction command for registering the current DAC value by the CPU of the LED group that has reached the reference value.

After step 1728 or if No in step 1726, return to the caller.

<Setting processing for 1%>
FIG. 16(c) is a subroutine of the 1% setting process (step 1730) of FIG. First, at step 1732, the PC 500 determines whether or not the 1% LED output has started, in other words, whether or not the DAC value command for the 1% setting process has been transmitted.

If No at step 1732, at step 1734, PC 500 sets a DAC value slightly above 1% of the maximum DAC value (here DAC value 44 because step 1624 subtracts the DAC value from -1).

If Yes at step 1732 , go to step 1736 .

Next, at step 1736, the PC 500 determines whether there is an LED group whose illuminance has reached the reference value.

If Yes at step 1736, at step 1738, the PC 500 transmits a registration instruction command for registering the current DAC value by the CPU of the LED group that has reached the reference value.

After step 1738 or if No in step 1736, return to the caller.

<<<Power supply side dimming adjustment process>>>
Next, FIG. 17 is a subroutine of the power supply side dimming adjustment process (step 1800) of FIG. First, in step 1802, the CPU 201 of the power supply 200 executes command reception processing.

In the command reception process, the CPU 201 of the power supply device 200 receives a DAC value command, a registration instruction command, a 100% adjustment completion command, a 50% adjustment completion command, a 1% adjustment completion command, an adjustment completion command, an illuminance range change command, and the like. .

Next, in step 1804, the CPU 201 of the power supply 200 executes command transmission processing. Specifically, it is as follows.

<Command received from PC and sent to lighting device>
When receiving the DAC value command from the PC 500 , the CPU 201 of the power supply device 200 transmits the DAC value command to the lighting device 300 .

When the CPU 201 of the power supply device 200 receives the registration instruction commands (for 100%, 50%, 1%) from the PC 500, the CPU 201 of the power supply device 200 sends the registration instruction commands (for 100%, 50%, 1%) to the lighting device 300. for use). That is, when there is an LED group whose illuminance has reached the reference value and a registration instruction command for registering the current DAC value is received from the PC 500, a registration instruction is sent to the CPU of the LED board corresponding to the registration instruction command. Send command.

The registration instruction command sent at this time is
(1) Which LED board's CPU registers the DAC value (2) Which brightness is registered as the DAC value (3) Which LED group's DAC value is registered can be recognized. there is

For example, which brightness is to be registered as a DAC value can be recognized as a registration instruction command for 100%, a registration instruction command for 50%, and a registration instruction command for 1%.

When the CPU 201 of the power supply device 200 receives the illumination range change command from the PC 500 , the CPU 201 transmits the illumination range change command to the lighting device 300 .

<Command received from lighting device and sent to PC>
When the CPU 201 of the power supply device 200 receives the 100% adjustment completion command from the CPU 351 of the LED board 350 , it transmits the 100% adjustment completion command to the PC 500 . The 100% adjustment completion command can be recognized for which LED group of the LED board 350 the 100% adjustment completion command is.

When receiving the 50% adjustment completion command from the CPU 351 of the LED board 350 , the CPU 201 of the power supply device 200 transmits the 50% adjustment completion command to the PC 500 . The 50% adjustment completion command can be recognized for which LED group of the LED board 350 the 50% adjustment completion command is.

When receiving the 1% adjustment completion command from the CPU 351 of the LED board 350 , the CPU 201 of the power supply device 200 transmits the 1% adjustment completion command to the PC 500 . The 1% adjustment completion command can be recognized for which LED group of the LED board 350 the 1% adjustment completion command is.

When receiving the adjustment completion command from the CPU 351 of the LED board 350 , the CPU 201 of the power supply device 200 transmits the adjustment completion command to the PC 500 . It is possible to recognize the adjustment completion command in which CPU 351 of the LED board 350 the adjustment completion command is.

Returning to the flowchart, after the processing of step 1804 is completed, in step 1806, the CPU 201 of the power supply device 200 determines whether or not adjustment completion commands for all LED groups have been received.

If No in step 1806 , that is, if the registration of the DAC value for each illuminance has not been completed for all LED groups, the process returns to step 1802 .

If Yes in step 1806, return to the caller.

<<<Lighting side dimming adjustment process>>>
Next, FIG. 18 is a subroutine of the illumination-side dimming adjustment process (step 1900) of FIG. First, in step 1902, the CPU 351 of the LED board 350 (CPUs (351-1, 351-2, 351-3, 351-4) of each LED board) executes command reception processing.

In the command reception process, the CPU 351 of the LED board 350 receives a DAC value command, a 100% registration instruction command, a 50% registration instruction command, a 1% registration instruction command, an illuminance range change command, etc., and stores them in the RAM 353 .

When receiving the illumination range change command, the CPU 351 of the LED board 350 changes the storage area of the RAM 353 in order to register the DAC value in the corresponding illumination range.

Next, in step 1904, the CPU 351 of the LED board 350 executes output processing for each LED group according to the DAC value stored in the RAM 353 (DAC value command received from the power supply device 200).

Next, at step 1906, the CPU 351 of the LED board 350 determines whether or not the 100% registration instruction command has been received.

If Yes at step 1906, at step 1908, the CPU 351 of the LED board 350 registers the current DAC values in the EEPROM 354 for the LED group indicated by the 100% registration instruction command, and completes 100% adjustment for the registered LED group. The command is transmitted to the CPU 201 of the power supply device 200 .

If No in step 1906 , the process proceeds to step 1910 .

Next, at step 1910, the CPU 351 of the LED board 350 determines whether or not the 50% registration instruction command has been received.

If Yes at step 1910, at step 1912, the CPU 351 of the LED board 350 registers the current DAC values in the EEPROM 354 for the LED group indicated by the 50% registration instruction command, and completes the 50% adjustment for the registered LED group. The command is transmitted to the CPU 201 of the power supply device 200 .

If No in step 1910 , the process proceeds to step 1914 .

Next, at step 1914, the CPU 351 of the LED board 350 determines whether or not the 1% registration instruction command has been received.

If Yes at step 1914, at step 1916, the CPU 351 of the LED board 350 registers the current DAC values in the EEPROM 354 for the LED group indicated by the 1% registration instruction command, and completes the 1% adjustment for the registered LED group. The command is transmitted to the CPU 201 of the power supply device 200 .

If No in step 1914 , the process proceeds to step 1918 .

Next, in step 1918, the CPU 351 of the LED board 350 determines whether the registration of the DAC values for all brightnesses (100%, 50%, 1%) in the current illuminance range in the EEPROM 354 has been completed. .

If No in step 1918 , the process returns to step 1902 .

In the case of Yes in step 1918, in step 1920, the CPU 351 of the LED board 350 determines whether the registration of the DAC values for all brightness levels (100%, 50%, 1%) in all illuminance ranges in the EEPROM 354 has been completed. determine whether

If No in step 1920 , the process returns to step 1902 .

If Yes at step 1920, at step 1922, the CPU 351 of the LED board 350 transmits an adjustment completion command to the CPU 201 of the power supply 200, and returns to the caller.

<<Registration image diagram when dimming adjustment is completed>>
Next, FIG. 19 is an image diagram when the dimming adjustment is completed. The DAC values registered in the LED boards 350-2 and 350-3 are omitted.

<Full illumination mode>
The DAC values of LED-a356a-1 and LED-b356b-1 of LED board 350-1 in full illumination mode are
[When 100%]
(1) LED-a356a-1: 4094
(2) LED-b356b-1: 4094
[When 50%]
(1) LED-a356a-1: 2046
(2) LED-b356b-1: 2048
[When 1%]
(1) LED-a356a-1:40
(2) LED-b356b-1:40
It has become.

The DAC values of LED-a 356a-4 and LED-b 356b-4 on the LED board 350-4 are
[When 100%]
(1) LED-a356a-4: 4094
(2) LED-b356b-4: 4094
[When 50%]
(1) LED-a356a-4: 2047
(2) LED-b356b-4: 2047
[When 1%]
(1) LED-a356a-4:39
(2) LED-b356b-4:39
It has become.

<High illumination mode>
The DAC values of the LED-a356a-1 and LED-b356b-1 of the LED board 350-1 in the high illumination mode are
[When 100%]
(1) LED-a356a-1: 4094
(2) LED-b356b-1: 4094
[When 50%]
(1) LED-a356a-1: 2046
(2) LED-b356b-1: 2048
[When 1%]
(1) LED-a356a-1:40
(2) LED-b356b-1:40
It has become.

The DAC values of LED-a 356a-4 and LED-b 356b-4 on the LED board 350-4 are
[When 100%]
(1) LED-a356a-4: 4094
(2) LED-b356b-4: 4094
[When 50%]
(1) LED-a356a-4: 2047
(2) LED-b356b-4: 2047
[When 1%]
(1) LED-a356a-4:39
(2) LED-b356b-4:39
It has become.

<Medium illumination mode>
The DAC values of LED-a356a-1 and LED-b356b-1 of the LED board 350-1 in the medium illumination mode are
[When 100%]
(1) LED-a356a-1: 2730
(2) LED-b356b-1: 2730
[When 50%]
(1) LED-a356a-1: 1365
(2) LED-b356b-1: 1364
[When 1%]
(1) LED-a356a-1:26
(2) LED-b356b-1:27
It has become.

The DAC values of LED-a 356a-4 and LED-b 356b-4 on the LED board 350-4 are
[When 100%]
(1) LED-a356a-4: 2730
(2) LED-b356b-4: 2730
[When 50%]
(1) LED-a356a-4: 1364
(2) LED-b356b-4: 1364
[When 1%]
(1) LED-a356a-4:27
(2) LED-b356b-4:26
It has become.

<Low illumination mode>
The DAC values of the LED-a356a-1 and LED-b356b-1 of the LED board 350-1 in the low illumination mode are
[When 100%]
(1) LED-a356a-1: 1365
(2) LED-b356b-1: 1365
[When 50%]
(1) LED-a356a-1: 682
(2) LED-b356b-1: 681
[When 1%]
(1) LED-a356a-1:13
(2) LED-b356b-1:14
It has become.

The DAC values of LED-a 356a-4 and LED-b 356b-4 on the LED board 350-4 are
[When 100%]
(1) LED-a356a-4: 1364
(2) LED-b356b-4: 1365
[When 50%]
(1) LED-a356a-4: 681
(2) LED-b356b-4: 681
[When 1%]
(1) LED-a356a-4:14
(2) LED-b356b-4:14
It has become.

By doing so, the illuminance of each LED group outputting as 100%, 50%, and 1% can be uniformed to emit light.

<<Illuminance Range>>
As described above, the LED board 350 has a range switching circuit (see FIG. 5), and can appropriately switch the range of illuminance (range of light and dark). By switching the illuminance range (range of illuminance), the illuminance range can be adjusted according to the surface condition of the material of the object to be inspected (roughness, existence and type of coating, etc.) and the type, size, and shape of defects. It can be switched to determine the appropriate illuminance to illuminate the inspection object.

<Full illumination mode>
FIG. 20(a) is a schematic diagram showing the full illumination mode. By operating the operation unit 207 of the power supply device 200, the operator can change the input value to adjust the illuminance. Here, when the input value is 3000, the intensity is 100% and the illuminance is high.

<Low illumination mode>
FIG. 20(b) is a schematic diagram showing the low illumination mode, medium illumination mode, and high illumination mode. In the low illuminance mode, the operator can change the input value by operating the operation unit 207 of the power supply device 200 to adjust the illuminance. Here, when the input value is 1000, the brightness is 100% and the illuminance is low. The brightness of 100% in the low illumination mode is about 1/3 of the maximum illumination in the full illumination mode and/or the high illumination mode.

<Medium illumination mode>
In the middle illuminance mode, the operator can change the input value and adjust the illuminance by operating the operation unit 207 of the power supply device 200 . Here, when the input value is 1000, the brightness is 100%, which is medium illuminance. The brightness of 100% in the middle illumination mode is about 2/3 of the maximum illumination in the full illumination mode and/or the high illumination mode.

<High illumination mode>
In the high illuminance mode, the operator can change the input value to adjust the illuminance by operating the operation unit 207 of the power supply device 200 . Here, when the input value is 1000, the brightness is 100% and the illuminance is high. Brightness 100% in the high illuminance mode is the same as the maximum illuminance in the full illuminance mode, but compared to the full illuminance mode, fine adjustment is not possible and rough illuminance adjustment is possible.

<<Summary of illumination range>>
The three modes of low illumination intensity mode, medium illumination intensity mode, and high illumination intensity mode differ in maximum illumination intensity, but the input value range (0 to 1000) corresponding to the illumination intensity is the same. On the other hand, in full illumination mode, the maximum illumination is the same as in high illumination mode, but the range of input values is wider than that of the other three modes (0-3000).

By configuring in this way, it is possible to switch the range of illuminance according to the inspection object and the defect, and make it easier to illuminate the inspection object with light of appropriate illuminance.

As described above, the switching of the illuminance range is performed by switching the combination of resistors (sense resistors) included in the constant current circuit in FIG. With this configuration, the maximum current value that can be supplied to the LED can be changed according to the combined resistance value of the sense resistors. That is, by switching the range of the current value that can be supplied to the LED according to the required illuminance, the illuminance range can be switched and used, and the current in the required illuminance range can be stabilized. Illuminance can also be stabilized. In particular, the resolution of the illuminance range of low illuminance can be made higher than that of the illuminance range of high illuminance, and the illuminance of low illuminance can be stabilized. Moreover, by switching the illuminance range, only the required illuminance range can be used, and the work can be made easy and simple.

<<DAC value calculation processing>>
Next, the DAC value generation processing in step 921 will be described. The CPU 351 of each LED board 350 uses the 100% DAC value, 50% DAC value, and 1% DAC value of each LED group stored in the illumination-side dimming adjustment process to determine the DAC value of each LED group corresponding to the input value. Calculate

For example, referring to FIGS. 12-14 and 19, LED-a 356a-1 on LED board 350-1 has a DAC value of 4094 at an input value of 1000 (100% intensity) in high illumination mode, and an input Assume that the DAC value is 2046 when the value is 500 (50% brightness), and the DAC value is 40 when the input value is 10 (1% brightness).

From the relationship between the input value and the DAC value, when the input value is X and the DAC value is Y, the straight line passing through the two points 1% = (10, 40) and 50% = (500, 2046) is
[Formula 1]
becomes.

Using this, for example, when the input value is 250 out of 1 to 500, the DAC value is 1,022.530612244898 (≈1022).

Similarly, the equation for a straight line through two points 50% = (500, 2046) and 100% = (1000, 4094) is
[Formula 2]
becomes.

Using this, for example, when the input value is 700 out of 500-1000, the DAC value is 2,865.2 (≈2865).

Thus, by creating Equations 1 and 2 and using Equation 1 or Equation 2, it is possible to calculate the DAC value for other input values.

In this way, by calculating the DAC value corresponding to the input value for each LED group (for example, LED-a 356a, LED-b 356b, etc.), the CPU 351 of the LED board 350 can set the DAC to the brightness desired by the operator. A value can control the output of the LED.

The illuminance at 1% is the MIN illuminance. Therefore, each LED group never emits light with an illuminance of 1% or less. For example, the LED-a 356a-1 does not emit light even when 1 to 9 are input as input values in the high illumination mode. In other words, light is emitted only when the input value becomes 10. By setting the MIN in this way, it is possible to prevent the illuminance at low illuminance from varying among the LED groups. The illuminance at 1% may not be associated with the MIN illuminance, and the illuminance at other ratios (3%, 5%, 10%, etc.) may be associated with the MIN illuminance. The ratio and the MIN illuminance may be associated according to the required minimum illuminance.

<<Error check processing>>
FIG. 21 is a subroutine of the error check process (step 2400) in FIG. First, at step 2402 , CPU 351 of LED board 350 transmits an LED temperature command indicating the LED temperature detected by the thermistor to CPU 201 of power supply device 200 .

Next, at step 2404, the CPU 351 of the LED board 350 determines whether the LED temperature is equal to or higher than the reference value.

In the case of Yes in step 2404, in step 2406, the CPU 351 of the LED board 350 performs LED illuminance reduction processing. Specifically, the LED is forcibly turned off. By performing an operation to turn on the LED through the menu operation of the power supply device 200, the LED is turned on again.

Next, in step 2408 , CPU 351 of LED board 350 transmits LED temperature error information (command) to CPU 201 of power supply 200 .

If No in step 2404 , the process proceeds to step 2410 .

Next, at step 2410, the CPU 351 of the LED board 350 determines whether or not an open error has occurred.

Specifically, the CPU 351 of the LED board 350 determines whether or not there is a defect in the current circuit for supplying current to the LEDs, for example, whether or not the circuit is disconnected.

If Yes in step 2410 , CPU 351 of LED board 350 transmits open error information (command) to CPU 201 of power supply 200 in step 2412 .

Next, at step 2414 , the CPU 351 of the LED board 350 transmits the LED board temperature information (command) to the CPU 201 of the power supply device 200 .

Next, at step 2416, the CPU 351 of the LED board 350 determines whether or not an LED board temperature error has occurred.

If Yes at step 2416, at step 2418, the CPU 351 of the LED board 350 transmits the LED board temperature error information (command) to the CPU 201 of the power supply 200, and returns to the calling source. If No in step 2416, the process returns to the caller.

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

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

<<Change example>>
In this embodiment, the end substrate 310 (end substrate 320) is configured to function as a relay substrate. In the modified example, the end substrate 310 (end substrate 320) is equipped with a CPU, ROM, RAM, EEPROM, and DAC (DAC-a, DAC-b), and the LED substrate is equipped with a constant current circuit, a current amplifier circuit, an LED , the light emission of the LEDs of the LED substrate 350 may be controlled from the end substrate 310 (end substrate 320).

By combining the light emission control function of the LEDs in the end substrate 310 (end substrate 320) in this way, the number of LED substrates 350 can be reduced when the number of LED substrates 350 is small (for example, two substrates). It is possible to reduce the size of the illumination device 300 and the like.

Further, in this embodiment, an example of calculating a DAC value from an input value using a linear function (linear approximation) was shown, but depending on the electrical characteristics, optical characteristics, processing speed, accuracy, etc. of the LED used, Alternatively, the DAC value may be calculated using polynomial approximation or various functions.
<<Summary of this embodiment>>
A first feature of this embodiment is that the CPU of the LED board can store the addresses of the LED groups in a predetermined order regardless of the direction of connection with the power supply device. This makes it easier for the operator to control the output of the lighting device by operating the power supply device. Even if a failure occurs in the LED group of any one of the LED boards, there is no need to change the lighting device to another lighting device. Specifically, when a failed LED board is replaced, the CPU of the LED board after replacement can store the same address as the CPU of the LED board before replacement, and partial replacement is easy. A second feature of this embodiment is that the illuminance of the LED group is made uniform, so that the accuracy of inspection can be improved.

In this embodiment, when the CPU of each LED board receives a command (control command) including an input value, it calculates the DAC value corresponding to the input value. A DAC value corresponding to each input value may be calculated and stored in the EEPROM of each LED board. In this case, when the operator operates the operation unit 207 of the power supply device 200 to set an input value, the CPU of each LED board, upon receiving a command (control command) including the input value, refers to the EEPROM to set the input value. , and outputs the DAC value to the DAC.

By configuring in this way, the processing load on the CPU when changing the input value can be reduced.

<<Another lighting device in this embodiment>>
The lighting device 1, which is another lighting device in this embodiment,
a light emitting unit having at least one light source that emits light;
a storage unit that stores control values corresponding to predetermined brightness (e.g., intensity of 1%, intensity of 50%, intensity of 100%) emitted from the light emitting unit;
A driving signal is generated from the control value read from the storage unit and supplied to the light emitting unit based on a correspondence relationship that associates the control value with an adjustment value (for example, an input value) for adjusting the brightness of light. and a control unit for
The storage unit
a first control value (e.g., 1% DAC value) corresponding to a first brightness (e.g., 1% intensity);
a second control value (eg, 50% DAC value) corresponding to a second brightness (eg, 50% intensity);
a third control value (eg, 100% DAC value) corresponding to a third brightness (eg, 100% intensity);
remember the
The control unit
The adjustment value is greater than or equal to a first adjustment value (e.g., an input value corresponding to 1% intensity) and smaller than a second adjustment value (e.g., an input value corresponding to 50% intensity) that is greater than the first adjustment value. sometimes generating a drive signal from a first correspondence obtained from the first adjustment value and the first control value and the second adjustment value and the second control value;
The adjustment value is greater than or equal to a second adjustment value (e.g., an input value corresponding to 50% intensity) and less than or equal to a third adjustment value (e.g., an input value corresponding to 100% intensity) that is greater than the second adjustment value. sometimes,
The lighting device generates a drive signal from a second correspondence obtained from the second adjustment value and the second control value, and the third adjustment value and the third control value.

The illumination device 2, which is another illumination device in this embodiment, further includes:
A plurality of the light emitting units (for example, LED-a356a-1, LED-b356b-1),
the storage unit stores a control value corresponding to the brightness of light emitted from each of the plurality of light emitting units for each of the plurality of light emitting units;
The control unit is the lighting device according to the lighting device 1 that generates a drive signal for each of the plurality of light emitting units.

The lighting device 3, which is another lighting device in this embodiment,
A plurality of light emitting units having at least one light source that emits light (for example, LED-a356a-1, LED-b356b-1, LED-a356a-2, LED-b356b-2, LED-a356a-3, LED-b356b- 3, LED-a356a-4, LED-b356b-4) and
a plurality of storage units (eg, EEPROM 354-1, EEPROM 354-2, EEPROM 354-3, EEPROM 354-4) storing control values corresponding to the brightness of light emitted from the plurality of light emitting units;
A drive signal is generated from control values read from a plurality of storage units and supplied to the light emitting unit based on a correspondence relationship that associates the control value with an adjustment value (for example, an input value) for adjusting the brightness of light. A plurality of control units (for example, CPU 351-1, CPU 351-2, CPU 351-3, CPU 351-4) are provided,
Each of the plurality of storage units
As a control value associated with at least one light emitting unit among a plurality of light emitting units and corresponding to the brightness of light emitted from the associated light emitting unit,
a first control value (e.g., 1% DAC value) corresponding to a first brightness (e.g., 1% intensity);
a second control value (eg, 50% DAC value) corresponding to a second brightness (eg, 50% intensity);
a third control value (eg, 100% DAC value) corresponding to a third brightness (eg, 100% intensity);
remember the
each of the plurality of control units is associated with one of the plurality of light emitting units;
each of the plurality of control units is associated with one of the plurality of storage units,
Each of the plurality of control units reads a control value read from the associated storage unit based on a correspondence relationship that associates a control value with an adjustment value (e.g., an input value) for adjusting the brightness of light. to generate a drive signal from and supply it to the associated light emitting unit,
When the adjustment value is greater than or equal to the first adjustment value (e.g., the input value corresponding to 1% intensity) and smaller than the second adjustment value (e.g., the input value corresponding to 50% intensity) that is greater than the first adjustment value , generating a drive signal from a first correspondence obtained from the first adjustment value and the first control value and the second adjustment value and the second control value;
When the adjustment value is greater than or equal to the second adjustment value (e.g., the input value corresponding to 50% intensity) and less than or equal to the third adjustment value (e.g., the input value corresponding to 100% intensity) that is greater than the second adjustment value ,
The lighting device generates a drive signal from a second correspondence obtained from a second adjustment value and the second control value, and a third adjustment value and the third control value.

The lighting device 4, which is another lighting device in this embodiment,
The adjustment values can be collectively set by an operator's operation (for example, the adjustment values can be set by the volume 207A),
The plurality of control units are
The lighting device according to the lighting device 3, which generates a drive signal from the first correspondence or the second correspondence according to an adjustment value set by an operator's operation.

In other words, the illumination device 1 according to the present embodiment is
a light source that emits light;
A first control value (e.g., 1% DAC value) corresponding to a first brightness (e.g., 1% intensity) of light emitted from the light source and a second brightness of light emitted from the light source (e.g., a second control value (e.g. 50% DAC value) corresponding to 50% intensity) and a third control value (e.g. 50% intensity) corresponding to a third brightness of the light emitted from the light source (e.g. , 100% DAC value);
A drive signal is generated from the control value read from the storage unit and supplied to the light source based on a correspondence relationship that associates the control value with an adjustment value (for example, an input value) for adjusting the brightness of light. a control unit,
The adjustment value is greater than or equal to a first adjustment value (e.g., an input value corresponding to 1% intensity) and smaller than a second adjustment value (e.g., an input value corresponding to 50% intensity) that is greater than the first adjustment value. sometimes generating a drive signal from a first correspondence obtained from the first illuminance and the first control value and the second illuminance and the second control value;
When the adjustment value is greater than or equal to the second adjustment value and less than or equal to a third adjustment value (for example, an input value corresponding to 100% intensity) that is greater than the second adjustment value, the second adjustment value and the second control value and a control unit that generates a drive signal from a second correspondence obtained from the third adjustment value and the third control value.

Further, the lighting device 1 in this embodiment is
a light source that emits light;
A first control value (e.g., 1% DAC value) corresponding to a first brightness (e.g., 1% intensity) of light emitted from the light source and a second brightness of light emitted from the light source (e.g., a second control value (e.g. 50% DAC value) corresponding to 50% intensity) and a third control value (e.g. 100% intensity) corresponding to a third brightness of the light emitted from the light source (e.g. , 100% DAC value);
A drive signal is generated from the control value read from the storage unit and supplied to the light source based on a correspondence relationship that associates the control value with an adjustment value (for example, an input value) for adjusting the brightness of light. a control unit,
the first adjustment value (for example, an input value corresponding to 1% intensity), the first control value, the second adjustment value (for example, an input value corresponding to 50% intensity), and the second control value; or obtained from the second adjustment value, the second control value, the third adjustment value (e.g., the input value corresponding to 100% intensity) and the third control value and a control unit that generates a drive signal from the second correspondence relationship.

200 power supply device 300 lighting device 350 LED substrate 30 housing 40 rod lens 50 diffuser lens

Claims (5)

A lighting device having a plurality of light source control boards,
Each of the plurality of light source control boards,
a light source that emits light with a predetermined brightness;
a storage unit that stores a control value corresponding to the brightness of light emitted from the light source;
a control unit that reads the control value, generates a drive signal based on the read control value, and supplies the drive signal to the light source;
with
each control unit of the plurality of light source control boards can generate identification information for identifying other light source control boards ;
each of the plurality of light source control boards further comprises a communication port for controlling transmission and reception of the identification information;
The plurality of light source control boards includes a first light source control board and a second light source control board,
The control unit of the first light source control board puts the second light source control board into a reception permission state in which the identification information can be received via the communication port,
each of the plurality of light source control boards is communicably connected to a command line separately from the communication port;
The lighting device, wherein the control unit of the second light source control board receives the identification information via the command line when the reception permission state is set. 2. The controller of the first light source control board according to claim 1, wherein the control unit of the first light source control board generates identification information for identifying the second light source control board based on identification information for identifying the first light source control board. lighting device. 2. The lighting system according to claim 1 , wherein each of said plurality of light source control boards is in either a permitted state for permitting reception of identification information or a prohibited state for prohibiting reception of identification information according to the state of said communication port. Device. further comprising a main controller that controls each of the plurality of light source control boards;
The lighting device according to claim 1 , wherein said main controller transmits a control command including initial information of said identification information to said light source control board via said command line. The main controller transmits the control command including the input value used for adjusting the brightness of the light to the light source control board via the command line,
5. The lighting device according to claim 4 , wherein each control unit of said plurality of light source control boards determines said control value according to said input value.

Images