JP6765072B2 - Lighting equipment, lighting systems, moving objects and imaging devices - Google Patents

Description

The present invention relates to a lighting device, a lighting system, a moving body and an imaging device.

Conventionally, an illumination device including illumination (an example of a light source) and an illumination control means (an example of a control unit) for adjusting the amount of illumination is disclosed (see, for example, Patent Document 1).

In this lighting device, after the imaging means (an example of the imaging device) that images the medium has taken an image, the lighting control means returns the light amount of the illumination to the light amount before the image pickup.

Japanese Unexamined Patent Publication No. 2015-888374

However, when the lighting device is blinking, the video flicker displayed on the image pickup device cannot be reduced. There is a desire to more reliably reduce the video flicker displayed on the image pickup device due to the blinking of the lighting device.

Therefore, an object of the present invention is to provide a lighting device, a lighting system, a moving body, and an imaging device capable of reliably reducing video flicker displayed on the imaging device.

In order to achieve the above object, the lighting device according to one aspect of the present invention is a lighting device capable of communicating with the image pickup device, and receives information on an exposure frequency from a light source that emits blinking light and the image pickup device. A control unit is provided, and the control unit controls a power supply unit for supplying a current to the light source so as to reduce video flicker displayed on the image pickup apparatus according to received information on the frequency of the exposure. In addition, the blinking frequency of the blinking light emitted by the light source is controlled by reducing or increasing the pulse amplitude or pulse width of the current of the power supply unit supplied to the light source.

According to the present invention, the video flicker displayed on the image pickup apparatus can be reliably reduced.

It is a schematic diagram which shows the lighting system which concerns on embodiment. It is a block diagram which shows the lighting system which concerns on embodiment. It is a flowchart which shows the operation of the lighting apparatus which concerns on embodiment. FIG. 4A is an image diagram showing the state of the video flicker displayed on the display unit of the image pickup apparatus according to the present embodiment. FIG. 4B is an image diagram showing a state in which the video flicker displayed on the image pickup apparatus according to the present embodiment is suppressed. FIG. 4C is an image diagram showing the blinking frequency of the light source in the lighting device according to the present embodiment and the exposure frequency in the imaging device. FIG. 4D is an image diagram showing a blinking frequency of a light source and an exposure frequency in the lighting device according to the present embodiment. FIG. 5 is an image diagram showing a moving body including a lighting device and an imaging device according to the first modification of the embodiment. It is a schematic diagram which shows the lighting system which concerns on the modification 2 of embodiment.

(Knowledge that became the basis of the present invention)
In recent years, exchanges through social networks have been actively carried out using terminal devices such as smartphones. For example, self-information, photos and videos taken with smartphones, etc. are uploaded via social networks.

In such a social environment, when many people interact with each other through social networks, it often happens in an environment under lighting. However, when a photo or video is taken in an environment under lighting, the photo or video displayed on the smartphone is taken when the light from a light source called video flicker is taken. A phenomenon occurs in which the colors and brightness of photographs and moving images vary.

It is unbearable to control the lighting device each time so that such video flicker does not occur. On the other hand, we want to reduce the video flicker displayed on the image pickup device due to the blinking of the lighting device. In such an environment where video flicker occurs, there is a risk that the advertising effect of companies through social networks will decline.

Therefore, the present invention provides a lighting device, a lighting system, a moving body, and an imaging device capable of reliably reducing video flicker displayed on the imaging device.

Hereinafter, embodiments will be described with reference to the drawings. It should be noted that all of the embodiments described below show comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, the order of steps, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept are described as arbitrary components.

Further, the description of "abbreviated **" is intended to include not only exactly the same but also substantially the same when explaining by taking "substantially the same" as an example.

It should be noted that each figure is a schematic view and is not necessarily exactly shown. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description may be omitted or simplified.

Hereinafter, the lighting device, the lighting system, the moving body, and the imaging device according to the embodiment of the present invention will be described.

(Embodiment)
[Constitution]
First, the configuration of the lighting system 1 according to the present embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a schematic view showing a lighting system 1 according to the present embodiment. FIG. 2 is a block diagram showing a lighting system 1 according to the present embodiment.

As shown in FIG. 1, the lighting system 1 includes a lighting device 10 and an imaging device 100. The lighting device 10 is a device that illuminates a predetermined space. In this embodiment, it is a street light attached to a pole 2 installed on a road. The pole 2 is provided with an image pickup device 100 that captures an image of a predetermined space illuminated by the lighting device 10.

[Lighting device]
The lighting device 10 is a device that utilizes the Broca-Sulzer effect that gives psychological brightness. The Blocker-Salzer effect is a human physiological visual characteristic of the perception of brightness, a phenomenon in which the perception of brightness changes with the time of blinking light. According to the blocker-Zalzer effect, for example, when the user is irradiated with light whose brightness is kept constant, the apparent brightness increases with the presentation time as the presentation time (blinking time) increases, and the predetermined brightness is determined. After reaching the maximum value over time, it may fall and eventually reach a certain level. In particular, when the presentation time is about 50 ms to 100 ms, the user feels that the brightness perceived by the eyes is brighter than the physical brightness.

As shown in FIG. 2, the lighting device 10 includes a light source 12, a control unit 13, a communication unit 14, a power supply unit 15, and an operation unit 16.

The light source 12 is a so-called SMD (Surface Mount Device) type LED element, and emits blinking light at a predetermined blinking frequency at which the light blinks. In the present embodiment, the blinking frequency of the light source 12 is less than 100 Hz. That is, the blinking is repeated 100 times or less per second. Further, the light source 12 is turned on and off by being controlled by a control circuit provided in the lighting device 10. Further, in the light source 12, the control unit 13 controls the power supply unit 15 (by adjusting the amount of power supplied) to perform dimming control (brightness control) and toning control (emission color control). .. The control circuit is realized by, for example, a microcomputer, a processor, a dedicated circuit, or the like that controls a current value or the like supplied to each light source 12 according to an input signal. The control circuit may be provided in the control unit 13 or may be separate from the control unit 13.

The light source 12 is not limited to such a configuration, and a COB (Chip On Board) type module in which an LED chip is directly mounted on a wiring board may be used.

The control unit 13 receives information regarding the frequency of exposure in the image pickup device 100, information regarding the termination of the image pickup unit 110, and the like from the image pickup device 100 via the communication unit 14. When the control unit 13 acquires these information, the information acquisition unit may acquire the information and transmit it to the control unit 13. The information acquisition unit may be provided in the control unit 13.

In order to improve the visibility, the control unit 13 shifts to the visibility improving mode in which the light emitted by the light source 12 blinks using the blocker-Zalzer effect. The visibility improvement mode improves visibility by blinking light.

The control unit 13 controls the blinking frequency of the light emitted by the light source 12 so as to reduce the video flicker displayed on the display unit 113 of the image pickup apparatus 100 according to the information regarding the frequency of the received exposure. To start. Specifically, in the video flicker reduction mode, the control unit 13 controls the light source 12 so that the control unit 13 emits light whose blinking frequency is a value obtained by multiplying the exposure frequency received from the image pickup device 100 by an integer. In FIG. 4 in the present embodiment, the blinking frequency is a value obtained by doubling the exposure frequency.

When the control unit 13 multiplies the exposure frequency by an integer and the blinking frequency of the light source 12 is 100 Hz or more, the control unit 13 emits the light source 12 so that the value obtained by dividing the exposure frequency by an integer is the blinking frequency. Control the frequency of light. The control unit 13 controls the light source 12 so that the light source 12 blinks with light having a blinking frequency of less than 100 Hz.

The control unit 13 controls the light source 12 so as to increase the amplitude or pulse width of the current supplied to the light source 12 when the exposure frequency is multiplied by an integral multiple in the video flicker reduction mode. When the frequency of the light emitted by the light source 12 by the control unit 13 is multiplied by an integral multiple, the pulse amplitude is reduced. The decrease in the amplitude of the pulse means that the brightness (luminance) of the light source 12 decreases. Therefore, the control unit 13 increases the amplitude of the reduced pulse so that the light source 12 does not become too dark. The brightness of the pulse amplitude can be adjusted by changing the duty ratio.

The control unit 13 controls the light source 12 so as to reduce the pulse amplitude or pulse width in the current when the exposure frequency is reduced to a fraction of an integer in the video flicker reduction mode. When the frequency of the light emitted by the light source 12 by the control unit 13 is reduced to 1 / integer, there is a characteristic that the amplitude of the pulse in the current increases. Increasing the amplitude of the pulse means that the brightness (luminance) of the light source 12 increases. Therefore, the control unit 13 reduces the amplitude of the increased pulse so that the light source 12 does not become too bright.

The control unit 13 has a timer function, and starts measuring the time when the video flicker reduction mode of the light source 12 is started. The control unit 13 determines whether or not the predetermined time has elapsed, and terminates the video flicker reduction mode when the predetermined time has elapsed. The predetermined time is a preset time, but the user may arbitrarily set it. The control unit 13 may realize these operations by, for example, a microcomputer, a processor, or a dedicated circuit that controls a current value or the like supplied to the light source 12 according to an input control signal.

The communication unit 14 is an antenna in which the lighting device 10 wirelessly communicates with the image pickup device 100 and the like. For example, the device-side communication unit 112 is a device having a short-range wireless communication function such as ZigBee (registered trademark), Wi-Fi (registered trademark), and BlueTooth (registered trademark). The communication unit 14 transmits information and the like regarding the frequency of exposure in the image pickup apparatus 100 to the illumination apparatus 10.

The power supply unit 15 has, for example, a case made of an insulating resin which is a power supply box, and a power supply circuit arranged in the case. The power supply circuit is a circuit unit composed of a circuit board and circuit components mounted on the circuit board, and supplies electric power for lighting (lighting) the light source 12 to the light source 12. For example, the power supply unit 15 converts the power supplied from the power system into a predetermined level of DC power by rectifying, smoothing, stepping down, etc., and supplies the DC power to the light source 12. The light source 12 emits light by the DC power supplied from the power supply circuit.

The power supply unit 15 is controlled by the control unit 13 to turn on and off the power supply to the light source 12. For example, when a lighting operation is received via an operation unit 16 such as a remote controller, the control unit 13 supplies electric power from the power supply unit 15 to the light source 12 to light the light source 12. When the operation unit 16 is turned off, the control unit 13 turns off the light source 12 by cutting off the power supply from the power supply unit 15 to the light source 12.

The operation unit 16 is an operation terminal such as a remote controller capable of performing operations such as dimming, toning, lighting and extinguishing of the lighting device 10.

[Imaging device]
The image pickup device 100 is a camera that captures still images, moving images, and the like, and is, for example, a security camera, a drive recorder, a smartphone camera, and the like. In the present embodiment, it is fixed to the pole 2 so as to image the area illuminated by the lighting device 10. The imaging device 100 includes an imaging unit 110, an imaging side control unit 111, a display unit 113, an imaging side communication unit 114, an imaging side power supply unit 115, an imaging side storage unit 116, and an imaging side operation unit 117. Have.

The image pickup unit 110 is a CMOS (Complementary Metal Oxide Sensor) image sensor or a CCD (Charge Coupled Device) image sensor. The imaging unit 110 can control the electronic shutter of the image sensor to change the exposure.

The image pickup side control unit 111 transmits information regarding the stop of the image pickup unit 110, information regarding the exposure frequency, and the like from the image pickup device 100 to the lighting device 10 via the image pickup side communication unit 114. The image pickup side control unit 111 is composed of a control circuit for controlling the display unit 113, the image pickup side storage unit 116, and the like. The image pickup side control unit 111 may be configured by a processor, a microcomputer, or the like.

The information regarding the termination of the imaging unit 110 may be, for example, information that the user of the imaging apparatus 100 has terminated the function of the imaging unit 110. When the function of the imaging unit 110 is terminated, the imaging side control unit 111 transmits information regarding the termination of the imaging unit 110 to the lighting device 10 via the imaging side communication unit 114.

The display unit 113 is a monitor for a liquid crystal display, an LED display, an organic EL display, or the like. The display unit 113 may be provided with a capacitive touch panel capable of operating the lighting device 10. In this case, the display unit 113 displays a screen prompting the operation of the lighting device 10.

The image pickup side communication unit 114 is a device provided with an antenna for wireless communication with the lighting device 10 and the like. For example, the imaging side communication unit 114 is a device having a short-range wireless communication function such as ZigBee (registered trademark), Wi-Fi (registered trademark), and BlueTooth (registered trademark).

The image pickup side power supply unit 115 is preferably a primary battery or a secondary battery, but may be a device supplied from the outside such as a personal computer. The image pickup side power supply unit 115 is electrically connected to the image pickup side control unit 111, and supplies electric power to each unit such as the display unit 113 and the image pickup side storage unit 116 via the image pickup side control unit 111.

The image pickup side storage unit 116 is a device that stores a control program executed by the image pickup side control unit 111 when the image pickup side control unit 111 includes a processor, a microcomputer, or the like. The image pickup side storage unit 116 is realized by, for example, a semiconductor memory. The image pickup side storage unit 116 stores information on the exposure frequency, information captured in the past, and the like.

The image pickup side operation unit 117 is an operation panel provided in the image pickup device. In the present embodiment, the imaging side operation unit 117 is a capacitive touch panel capable of operating the lighting device 10.

[motion]
The operation of the lighting device 10 according to the present embodiment will be described with reference to FIGS. 3 and 4.

FIG. 3 is a flowchart showing the operation of the lighting device 10 according to the present embodiment. FIG. 4A is an image diagram showing a state of video flicker displayed on the display unit 113 of the image pickup apparatus 100 according to the present embodiment. FIG. 4B is an image diagram showing a state in which the video flicker displayed on the image pickup apparatus 100 according to the present embodiment is suppressed. FIG. 4C is an image diagram showing the blinking frequency of the light source 12 in the lighting device 10 according to the present embodiment and the exposure frequency in the image pickup device 100. FIG. 4D is an image diagram showing a blinking frequency of the light source 12 and an exposure frequency in the lighting device 10 according to the present embodiment.

FIG. 4C is an image diagram when the blinking frequency is 50 Hz and the exposure frequency is 40 Hz. FIG. 4D is an image diagram when the blinking frequency is 80 Hz and the exposure frequency is 40 Hz.

In the present embodiment, a case where one image pickup apparatus 100 is used will be described with reference to a flowchart. This flowchart shows a state in which a visibility improvement mode for improving visibility by blinking is selected.

As shown in FIG. 3, first, when the user turns on the power of the lighting device 10 via the image pickup side operation unit 117, the lighting device 10 is turned on (step S1).

Next, the control unit 13 determines whether or not information regarding the exposure frequency has been received from the image pickup apparatus 100 (step S2).

When the control unit 13 determines that the information regarding the exposure frequency has not been received from the image pickup apparatus 100 (NO in step S2), the control unit 13 returns to step S2.

On the other hand, when the control unit 13 determines that the information regarding the exposure frequency has been received from the image pickup apparatus 100 (YES in step S2), the control unit 13 starts the video flicker reduction mode (step S3).

For example, the blinking frequency of the light source 12 in the lighting device 10 is less than 100 times per second (the blinking frequency is less than 100 Hz). As shown in FIG. 4C, for example, when the blinking frequency of the light source 12 is 60 Hz and the exposure in the image pickup apparatus 100 is 1/50 second (exposure frequency: 50 Hz), the blinking frequency of the light source 12 and the imaging are performed. Since the frequency of exposure in the device 100 is not synchronized, for example, in the image pickup device 100 using a CMOS image sensor, a video flicker occurs on the display unit 113 as shown in FIG. 4A. In the image pickup apparatus 100 using the CCD image sensor, video flicker occurs in which the entire display unit 113 repeatedly becomes bright and dark.

Specifically, in the case of the exposure frequency of 40 Hz in FIG. 4C, there are a shaded portion indicating a time integral value of the blinking frequency of the light source 12 and another portion P. It can be seen that the position of the other portion P changes in the pulse with the passage of time. That is, as shown by FIG. 4A, the shaded portion indicating the integrated value changes with the passage of time, so that the video flicker is displayed on the display unit 113 of the image pickup apparatus 100.

Therefore, as shown in FIG. 4C, in the video flicker reduction mode, for example, the control unit 13 emits light having a blinking frequency of 80 Hz, which is twice the exposure frequency of 40 Hz (an example of an integral multiple). The light source 12 is controlled.

Specifically, in the pulse at the blinking frequency of 80 Hz in FIG. 4D, it can be seen that the position of the other portion P in the pulse does not change even after a lapse of time. That is, as shown in FIG. 4B, since the shaded portion indicating the time integral value of the blinking frequency of the light source 12 is substantially the same, the image flicker is suppressed on the display unit 113 of the image pickup apparatus 100. Is displayed. In other words, since the blinking frequency of the light source 12 and the exposure frequency of the imaging device 100 are synchronized, an image in which video flicker is suppressed is displayed on the display unit 113 of the imaging device 100.

Next, the control unit 13 determines whether or not the exposure frequency is multiplied by an integer in the video flicker reduction mode in step S3 (step S4).

When the control unit 13 determines that the exposure frequency is an integral multiple (YES in step S4), the amplitude or pulse width of the current supplied to the light source 12 is increased (step S5). For example, in a state where the blinking frequency is high, the light emitted from the light source 12 becomes dark due to the blunting of the pulse. In this case, in order to maintain the brightness of the light emitted by the light source 12, correction is performed to increase the amplitude or pulse width of the current supplied to the light source 12. When the control unit 13 multiplies the exposure frequency by an integer, for example, the blinking frequency is less than 100 Hz even if the exposure frequency is multiplied by an integer.

On the other hand, when the control unit 13 determines that the exposure frequency is reduced to 1 / integer (NO in step S4), the amplitude or pulse width of the current supplied to the light source 12 is reduced (step S9). For example, when the blinking frequency is low, the light emitted from the light source 12 becomes too bright. In this case, in order to maintain the brightness of the light emitted by the light source 12, correction is performed to increase the amplitude or pulse width. When the control unit 13 reduces the exposure frequency to a fraction of an integer, for example, if the exposure frequency is multiplied by an integer, the blinking frequency is prevented from becoming 100 Hz or higher.

Next, the control unit 13 determines whether or not the predetermined time has elapsed (step S6).

Next, when the control unit 13 determines that the predetermined time has elapsed (YES in step S6), the control unit 13 ends the video flicker reduction mode (step S8). Then, this flow is repeated.

Next, when the control unit 13 determines that the predetermined time has not elapsed (NO in step S6), the control unit 13 determines whether or not the information regarding the stop has been received from the image pickup device 100 (step S7). ..

Next, when the control unit 13 determines that the information regarding the stop has not been received from the imaging device 100 (NO in step S7), it is determined that the user is in a state of continuing imaging, and the process returns to step S6.

On the other hand, when the control unit 13 determines that the information regarding the stop has been received from the image pickup device 100 (YES in step S7), the control unit 13 determines that the user ends the imaging and ends the video flicker reduction mode (the video flicker reduction mode is terminated). Step S8). Then, this flow is repeated.

[Action effect]
Next, the operation and effect of the lighting device 10 in the present embodiment will be described.

As described above, the lighting device 10 according to the present embodiment can communicate with the image pickup device 100. Further, the lighting device 10 includes a light source 12 that emits blinking light, and a control unit 13 that receives information on the exposure frequency from the image pickup device 100. Then, the control unit 13 controls the blinking frequency of the blinking light emitted by the light source 12 so as to reduce the video flicker displayed on the display unit 113 of the image pickup apparatus 100 according to the information regarding the frequency of the received exposure.

According to this configuration, the control unit 13 determines the light emitted by the light source 12 so as to reduce the video flicker displayed on the display unit 113 of the image pickup device 100 according to the information regarding the exposure frequency received from the image pickup device 100. Control the blinking frequency. Therefore, even if the light source 12 of the lighting device 10 emits blinking light, video flicker is unlikely to occur on the display unit 113 of the imaging device 100, and it is easy to display a comfortable image.

Therefore, according to the lighting device 10, even if the lighting device 10 blinks to the extent that it can be visually recognized, the video flicker displayed on the display unit 113 of the image pickup device 100 can be reliably reduced.

Further, the lighting system 1 according to the present embodiment includes a lighting device 10 and an imaging device 100. Further, the image pickup apparatus 100 according to the present embodiment can transmit information regarding the exposure frequency to the illumination apparatus 10.

Even in these configurations, the same effects as those of the lighting device 10 are obtained.

Further, in the lighting device 10 according to the present embodiment, the control unit 13 controls the light source 12 so as to emit light having a blinking frequency in which the exposure frequency is an integral multiple or the exposure frequency is an integral fraction. ..

According to this configuration, the control unit 13 controls the blinking frequency of the light emitted from the light source 12 so that the exposure frequency is synchronized with the exposure frequency. Therefore, in the lighting device 10, the video flicker displayed on the display unit 113 of the image pickup device 100 can be reduced.

Further, in the lighting device 10 according to the present embodiment, the control unit 13 increases the amplitude or pulse width of the current supplied to the light source 12 when the exposure frequency is multiplied by an integer. Then, the control unit 13 controls the light source 12 so as to reduce the amplitude or pulse width of the current supplied to the light source 12 when the exposure frequency is reduced to a fraction of an integer.

According to this configuration, even if the control unit 13 changes the blinking frequency, the amplitude or pulse width of the current supplied to the light source 12 changes, so that the brightness of the light emitted from the light source 12 is unlikely to change. Therefore, it is difficult for the display unit 113 of the image pickup apparatus 100 to display the image in which the video flicker occurs, and the image without discomfort is likely to be displayed on the display unit 113 of the image pickup apparatus 100.

Further, in the lighting device 10 according to the present embodiment, the control unit 13 controls the blinking frequency to less than 100 Hz.

According to this configuration, even if the control unit 13 blinks the light emitted by the light source 12 in order to improve the visibility, it is difficult for the display unit 113 of the image pickup apparatus 100 to display the image in which the video flicker occurs. Therefore, even if the light emitted by the light source 12 is blinking, a natural image is easily displayed on the display unit 113 of the image pickup apparatus 100. As a result, even if the lighting device blinks to the extent that it can be visually recognized, the video flicker displayed on the display unit 113 of the image pickup device 100 can be reliably reduced.

Further, in the lighting device 10 according to the present embodiment, the control unit 13 returns the blinking frequency of the light source 12 to the initial state when a predetermined time elapses after the information is no longer received from the image pickup device 100.

According to this configuration, the video flicker reduction mode is terminated after a predetermined time has elapsed from the start of the video flicker reduction mode, so that the lighting in the original state can be performed.

In particular, since the lighting device 10 controls the blinking frequency of the light emitted from the light source 12 so as to reduce the video flicker displayed on the display unit 113 of the image pickup device 100, it is not necessary to provide the image pickup device 100 with a complicated function. .. Therefore, the complexity of the image pickup apparatus 100 can be suppressed.

(Modification 1 of the embodiment)
Hereinafter, the lighting system 1 according to the present modification of the embodiment will be described.

[Constitution]
The configuration of the lighting device 310 according to the present modification of the embodiment will be described.

FIG. 5 is an image diagram showing a vehicle 200 (an example of a moving body) including a lighting device 310 and an image pickup device 320 according to the present modification of the embodiment.

As shown in FIG. 5, the lighting device 310 and the imaging device 320 are provided in the vehicle 200. The vehicle 200 is equipped with a lighting system 300 including an image pickup device 320 and a lighting device 310. The image pickup device 320 is, for example, a drive recorder. Further, the lighting device 310 is, for example, a headlight. In the lighting system 300, when the lighting device 310 is lit, the imaging device 320 images the lighting. In the present modification of the embodiment, the vehicle 200 is used as the moving body, but the present invention is not limited to this, and may be used for, for example, an aircraft, a train, a ship, or the like.

In this modification of the embodiment, the other configurations of the illuminating device 310 are the same as those of the illuminating device 10 of the embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted. .. Further, since the operation of the lighting device 310 according to the present modification of the embodiment is the same as that of the first embodiment, detailed description thereof will be omitted.

[Action effect]
Next, the operation and effect of the lighting device 310 in the present modification of the embodiment will be described.

As described above, the vehicle 200 according to the present modification of the embodiment includes a lighting device 310.

Further, the other effects of the vehicle 200 in the present modification of the embodiment also have the same effects as those of the lighting device 10 of the embodiment.

(Modification 2 of the embodiment)
Hereinafter, the lighting system 400 according to the present modification of the embodiment will be described.

[Constitution]
The configuration of the lighting system 400 according to the present modification of the embodiment will be described with reference to FIG.

FIG. 6 is a schematic view showing the lighting system 400 according to the present modification of the embodiment.

This modification of the embodiment is different from the embodiment in that a plurality of image pickup devices 100 having different exposure frequencies are used.

In the present modification of the embodiment, the other configurations in the lighting system 400 are the same as those of the lighting system 1 of the embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted. ..

The lighting system 400 includes a lighting device 10 and a plurality of imaging devices 100. In this modification of the embodiment, two image pickup devices 100 are used, and the image pickup device 100 is fixed to each of the two poles 2 installed on the street. The exposures of these image pickup devices 100 are different from each other. Each image pickup device 100 is provided on one or a plurality of poles 2 so as to image an area illuminated by one lighting device 10.

The control unit 13 of the lighting device 10 receives information on the exposure frequency from the plurality of imaging devices 100, and controls the blinking frequency of the light emitted by the light source 12 so that video flicker does not occur in the imaging device 100. That is, when the control unit 13 controls the light source 12 so as to emit light having a blinking frequency obtained by reducing the exposure frequency to a fraction of an integer, the greatest common divisor of the exposure frequency in each imaging device 100 is set to the blinking frequency. The light source 12 is controlled so as to.

[motion]
The operation of the lighting device 10 according to the present modification of the embodiment will be described with reference to FIG.

In this modification of the embodiment, a case where two image pickup devices 100 are used will be described with reference to a flowchart. It should be noted that this is just an example, and the number of image pickup devices 100 may be two or more.

As shown in FIG. 3, first, in step S1 and step S2, the same operation as that of the embodiment is performed. In step S2, information regarding the exposure frequency is received from the plurality of image pickup devices 100.

In step S2, the control unit 13 receives information on the exposure frequency from the other image pickup device 100 so that the light emitted by the light source 12 is not displayed on the display units 113 of the two image pickup devices 100. The video flicker reduction mode for controlling the frequency of is started (step S3).

In step S3, the control unit 13 controls the light source 12 so that the greatest common divisor of the exposure frequency in each image pickup apparatus 100 is the blinking frequency. For example, when the exposure frequency of one image pickup device 100 is 50 Hz and the exposure frequency of the other image pickup device 100 is 60 Hz, the control unit 13 sets the blinking frequency of the light emitted by the light source 12 to 10 Hz. 12 is controlled. That is, in any of the image pickup devices 100, the blinking frequency of the light emitted by the light source 12 is an integral fraction of the exposure frequency in the image pickup device 100.

[Action effect]
Next, the operation and effect of the lighting device 10 in the present modification of the embodiment will be described.

As described above, the lighting device 10 according to the present modification of the embodiment receives information from a plurality of image pickup devices 100 having different exposure frequencies. Then, the control unit 13 controls the blinking frequency of the light source 12 so as to reduce the video flicker displayed on each image pickup device 100.

According to this configuration, even when there are a plurality of lighting devices 10 having different exposure frequencies, it is possible to reduce video flicker displayed on the display units 113 of all the image pickup devices 100 at the same time. Therefore, the lighting device 10 is highly convenient.

Further, in the lighting device 10 according to the present modification of the embodiment, when the control unit 13 controls the light source 12 so as to emit light having a blinking frequency obtained by reducing the exposure frequency to a fraction of an integral number, each image pickup is performed. The light source 12 is controlled so that the maximum commitment frequency of the exposure frequency in the device 100 is the blinking frequency.

According to this configuration, even if there are a plurality of image pickup devices 100 having different exposure frequencies, the greatest common divisor of the exposure frequency in each image pickup device 100 is set as the blinking frequency, and all of them are simultaneously performed. The video flicker displayed on the display unit 113 of the image pickup apparatus 100 can be reduced. Therefore, the lighting device 10 is highly convenient.

Further, other effects of the lighting system 400 in the present modification of the embodiment also have the same effects as those of the embodiment.

(Other modifications, etc.)
Although the present invention has been described above based on the embodiments 1 and 2 of the embodiments, the present invention is not limited to the embodiments 1 and 2 of the above embodiments and embodiments. Absent.

For example, in the above-described embodiment and modifications 1 and 2 of the embodiment, in the visibility improvement mode, some of the light of a plurality of colors in the light source may be blinked, and the light of a part of the colors may be blinked from all the light sources. The emitted light may be blinked.

Further, in the above-described embodiments and modifications 1 and 2 of the embodiments, the user may shift to the visibility improvement mode by arbitrarily setting the mode via the operation unit, and the user may move with a sensor or the like. May be detected and the mode may be changed to the visibility improvement mode.

Further, in the present embodiment and the modified examples 1 and 2 of the embodiment, when the imaging device such as a smartphone is activated, information regarding the activation of the imaging unit may be transmitted to the lighting device, and the activation may be performed at another timing. Information about the luminaire may be sent. Further, when the imaging device is terminated, information regarding the termination of the imaging unit may be transmitted to the lighting device, or information regarding the termination may be transmitted to the lighting device at other timings.

Further, in the above-described embodiments and modifications 1 and 2 of the embodiments, when a plurality of users are present in one lighting device using a plurality of imaging devices having different exposure frequencies, the control unit is used. Even if the information regarding the activation of the imaging unit is received from the imaging device that is activated earliest among the plurality of imaging devices and the blinking frequency of the light emitted by the light source is controlled so that video flicker does not occur in the imaging device. Good. When the control unit detects the activation of another imaging device after the earliest imaging device is activated, the blinking frequency of the light source is set on the display units of all the imaging devices so as to reduce the video flicker of the image. You may control it. Further, the same may be applied when the activation of another imaging device is detected. The information regarding the activation of the imaging unit may be, for example, information that the user of the imaging apparatus has performed the initial operation in order to bring out the function of the imaging unit. The image pickup side control unit may transmit information regarding activation of the image pickup unit to the lighting device via the image pickup side communication unit when the function of the image pickup unit can be exerted.

Although one or more aspects of the present invention have been described above based on the embodiments 1 and 2 of the embodiments, the present invention describes the embodiments and the modifications 1 and 2. It is not limited to 2. As long as it does not deviate from the gist of the present invention, various modifications that can be conceived by those skilled in the art are applied to the first and second modifications of the present embodiment and the embodiments, or a form constructed by combining components in different embodiments. Also may be included within the scope of one or more aspects of the invention.

1,300,400 Lighting system 10,310 Lighting device 12 Light source 13 Control unit 100, 320 Imaging device 200 Vehicle (moving body)

Claims (10)

A lighting device that can communicate with an image pickup device
A light source that emits blinking light and
It is provided with a control unit that receives information on the frequency of exposure from the image pickup apparatus.
The control unit
Control the power supply unit to supply current to the light source,
By reducing or increasing the pulse amplitude or pulse width of the current of the power supply unit supplied to the light source so as to reduce the video flicker displayed on the image pickup apparatus according to the received information on the frequency of the exposure. , An illuminating device that controls the blinking frequency of the blinking light emitted by the light source. The lighting device according to claim 1, wherein the control unit controls the light source so as to emit light having the blinking frequency in which the exposure frequency is an integral multiple or the exposure frequency is a fraction of an integer. The control unit
When the frequency of the exposure is multiplied by an integer, the amplitude or pulse width of the current supplied to the light source is increased.
The lighting device according to claim 2, wherein the light source is controlled so as to reduce the amplitude or pulse width of the current supplied to the light source when the frequency of the exposure is reduced to a fraction of an integer. The lighting device according to any one of claims 1 to 3, wherein the control unit controls the blinking frequency to less than 100 Hz. A lighting device that receives the information from a plurality of the imaging devices having different exposure frequencies.
The lighting device according to any one of claims 1 to 4, wherein the control unit controls the blinking frequency of the light source so as to reduce video flicker displayed on each image pickup device. The control unit
When the light source is controlled so as to emit light having the blinking frequency obtained by reducing the exposure frequency to a fraction of an integer.
The lighting device according to claim 5, wherein the light source is controlled so that the greatest common divisor of the exposure frequency in each of the imaging devices is the blinking frequency. The illumination according to any one of claims 1 to 6, wherein the control unit returns the blinking frequency of the light source to an initial state when a predetermined time elapses after no longer receiving information from the image pickup apparatus. apparatus. A lighting system including the lighting device according to any one of claims 1 to 7 and the imaging device. An imaging device capable of transmitting information regarding the frequency of exposure to the lighting device according to any one of claims 1 to 7. A mobile body including the lighting device according to any one of claims 1 to 7.