JP7245428B2 - lighting system - Google Patents

Description

Embodiments of the invention relate to lighting systems.

A lighting system has been introduced in which a camera captures an image of an area illuminated by a plurality of lighting devices installed in a space.

JP 2017-162682 A

In such a lighting system, for example, when illuminating a space larger than the photographable range of the camera, there is a possibility that a blind spot occurs in the space where the object to be imaged cannot be seen.

A problem to be solved by the present invention is to provide an illumination system capable of capturing an image of an imaging target more reliably.

A lighting system according to an embodiment includes a plurality of lighting devices. The illumination device has an illumination section and a camera. The lighting section has a plurality of light emitting elements. The camera is adjacent to the lighting section. A plurality of lighting devices are arranged so that the imaging target is reflected in one of the cameras, and the angle of view of the camera and the distance from the lighting device to the imaging target are such that the brightness with which the imaging target is illuminated exceeds a predetermined threshold. are spaced based on

ADVANTAGE OF THE INVENTION According to this invention, the illumination system which can image an imaging target more reliably can be provided.

FIG. 1 is a perspective view showing an appearance example of a lighting device included in a lighting system according to an embodiment. FIG. 2 is a block diagram schematically showing an example of a configuration of an illumination device included in the illumination system according to the embodiment; FIG. 3 is a diagram illustrating an arrangement example of lighting devices included in the lighting system according to the embodiment; FIG. 4 is a diagram illustrating an arrangement example of lighting devices included in the lighting system according to the embodiment. FIG. 5 is a diagram illustrating an arrangement example (1) of lighting devices included in a lighting system according to a modification of the embodiment; FIG. 6 is a diagram illustrating an arrangement example (2) of lighting devices included in a lighting system according to a modification of the embodiment;

A lighting system 100 according to an embodiment described below includes a plurality of lighting devices 1 and 1A. The illumination devices 1 and 1A each have an illumination section 2 and a camera 32 . The lighting section 2 has a plurality of light emitting elements. The camera 32 is adjacent to the lighting section 2 . The plurality of lighting devices 1 and 1A are arranged at intervals based on the angle of view of the camera 32 and the distance from the lighting devices 1 and 1A to the imaging target 12 .

A plurality of lighting devices 1 and 1A according to embodiments described below are arranged along the length direction of the lighting devices 1 and 1A.

A plurality of lighting devices 1 and 1A according to embodiments described below are arranged along the width direction of the lighting device 1 .

A camera 32 according to an embodiment described below is arranged at an end of the illumination section 2 in the length direction.

A camera 32 according to an embodiment described below has different angles of view in the length direction and the width direction of the lighting section 2 .

A plurality of lighting devices 1 and 1A according to the embodiments described below are arranged so that the distance from a predetermined irradiation surface is 2 m or more.

Embodiments according to the present invention will be described below with reference to the drawings. It should be noted that the embodiments shown below do not limit the technology disclosed by the present invention. In addition, the embodiments and modifications described below can be appropriately combined within a consistent range. In addition, in the following description, the same reference numerals are given to the same configurations, and the description later will be omitted as appropriate.

[Embodiment]
FIG. 1 is a perspective view showing an appearance example of a lighting device included in a lighting system according to an embodiment. As shown in FIG. 1 , the illumination device 1 has an illumination section 2 , an imaging unit 3 and a main body section 4 . The illumination device 1 is a ceiling-mounted illumination device in which a main body 4 is installed on a ceiling surface, and light output from the illumination unit 2 is irradiated onto a floor surface, which is an example of an irradiation surface. The lighting device 1 is mainly used indoors for purposes such as monitoring a production line in a factory and monitoring the status of employees in an office.

In order to make the explanation easier to understand, FIG. 1 shows a three-dimensional orthogonal coordinate system including the Z-axis, in which the vertically downward direction is the positive direction and the vertically upward direction is the negative direction. Also, the X-axis is shown along the length direction of the lighting device 1, and the Y-axis is shown along the width direction of the lighting device 1, respectively. Such an orthogonal coordinate system may also be shown in other drawings used in the description below.

The lighting unit 2 has a plurality of light emitting elements (not shown) arranged at predetermined intervals on a long chassis or substrate (not shown) arranged along the Y-axis direction. The lighting bar is provided with a diffusion cover 20 on the floor surface side, that is, on the Z-axis positive direction side so that the light emitting element is housed between the .

The diffusion cover 20 is made of, for example, translucent material such as acrylic or polycarbonate. The diffusion cover 20 is frosted and has a function of diffusing the light emitted from the plurality of light emitting elements. Note that the diffusion cover 20 may be appropriately mixed with a diffusion material or a coloring agent.

The imaging unit 3 has a light shielding cover 30 and a camera, which will be described later, and is arranged side by side so as to be adjacent to the lighting section 2 in the negative direction of the X axis.

The body portion 4 holds the lighting portion 2 and the imaging unit 3 . The body portion 4 also serves as an attachment member for attaching the lighting device 1 to a predetermined position such as the ceiling.

The light shielding cover 30 is disposed on the Z-axis positive direction side of the body portion 4 so as to cover the camera between the body portion 4 and the light shielding cover 30 . Further, the light shielding cover 30 has a through hole provided at a position facing the lens of the camera. By arranging such a light shielding cover 30, it is possible to make it difficult for the light emitted from the diffusion cover 20 of the lighting section 2 to enter the lens of the camera.

Next, a functional configuration of the illumination device 1 will be described. FIG. 2 is a block diagram schematically showing an example of a configuration of an illumination device included in the illumination system according to the embodiment;

As shown in FIG. 2 , the illumination device 1 includes a connection portion 6 , a body portion 4 , an illumination portion 2 and an imaging unit 3 . The connecting portion 6 is a terminal block on which terminals for connecting various cables for operating the lighting device 1 are arranged.

The body portion 4 has a power control portion 7 and a storage portion 17 . The power control unit 7 has a power supply unit 13 and a control microcomputer 14 .

The power supply unit 13 has a power supply circuit that converts the AC power supplied from the AC power supply 21 via the connection unit 6 into DC power and outputs the DC power. The AC power supply 21 is, for example, a commercial power supply.

In addition, the power supply unit 13 supplies direct current at a predetermined voltage (eg, 50 V) to the lighting unit 2 to control lighting of the light emitting element 5, which will be described later. The power supply unit 13 is an example of a lighting control unit. Furthermore, the power supply unit 13 converts the direct current into a predetermined voltage (eg, 5 V) and supplies power to the imaging unit 3 .

The control microcomputer 14 is a processing unit that generates a control signal preset in the storage unit 17 and outputs the control signal to the power supply unit 13, lighting control unit, and imaging control unit described later.

The lighting section 2 has a plurality of light emitting elements 5 . The light emitting elements 5 are connected to wiring patterns on the chassis, are supplied with DC output from the power supply section 13, and are controlled to be lit by the lighting control section. The light emitting element 5 includes, for example, an LED chip arranged in a main body made of ceramics, and translucent resin for molding, such as epoxy resin or silicone resin, which seals the LED chip.

The LED chip is, for example, a blue LED chip that emits blue light. The translucent resin is mixed with a phosphor, and in order to emit white light, a yellow phosphor that emits yellow light, which is complementary to blue light, is used. there is The LED chip may emit red light, green light, or white light, for example. Also, the translucent resin may be a diffusion member that has a milky white color and diffuses light.

In addition, the LED may be mounted directly on the chassis or substrate of the illumination unit 2, or may be mounted with a bullet-shaped LED, and the mounting method and form are not particularly limited. not something.

The imaging unit 3 has an imaging control section 31 and a camera 32 . The imaging control unit 31 controls imaging by the camera 32 . The camera 32 includes an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) that electronically acquires an image, and a lens, and has a predetermined angle of view according to the imaging element and the lens. Take an image. The imaging unit 3 may have a storage section (not shown) for recording images captured by the camera 32 .

Here, an arrangement example of the lighting device 1 will be described. FIG. 3 is a diagram illustrating an arrangement example of lighting devices included in the lighting system according to the embodiment; 3A is a side view of two lighting devices 1 arranged in the width direction (Y-axis direction) from the length direction (X-axis direction), and FIG. 1 is a side view of two illumination devices 1 arranged in the axial direction) from the width direction (Y-axis direction). Here, only the lighting unit 2 and the imaging unit 3 are shown among the configurations of the lighting device 1 attached to the ceiling surface 10, and other configurations are omitted.

As shown in FIG. 3(a), the distance a in the width direction (Y-axis direction) between the adjacent lighting devices 1 is the angle of view θ1 in the Y-axis direction of the camera (not shown) of the imaging unit 3 and the lighting device 1 to the imaging target 12 at intervals based on the distance d. Specifically, when the angle of view θ1=92° and the height from the floor surface 11, which is the irradiation surface, to the ceiling surface 10, which is the installation surface of the lighting device 1, is H (m), the interval a (m) is It can be specified as follows.

a≦2.07H−3.42 (however, H≧2) (1)

Here, when a>2.07H-3.42, there may be a case where none of the cameras of the plurality of lighting devices 1 arranged in the Y-axis direction capture an image of the imaging target 12 . On the other hand, when Expression (1) is satisfied, the imaging target 12 is imaged by at least one of the plurality of lighting devices 1 arranged in the Y-axis direction. In particular, when a=2.07H−3.42, the object 12 to be imaged is imaged by the camera of any one of the plurality of illumination devices 1 arranged in the Y-axis direction. Therefore, the minimum number of illumination devices 1 can be arranged in the Y-axis direction.

Next, as shown in FIG. 3B, the interval b in the length direction (X-axis direction) of the adjacent lighting devices 1 is the angle of view θ2 of the camera (not shown) of the imaging unit 3 in the X-axis direction. , are arranged at intervals based on the distance d from the lighting device 1 to the imaging target 12 . Specifically, when the angle of view θ2=130° and the height from the floor surface 11, which is the irradiation surface, to the ceiling surface 10, which is the installation surface of the lighting device 1, is H (m), the interval b (m) is It can be specified as follows.

b≤4.29H-7.09 (however, H≥2) (2)

Here, when b>4.29H−7.09, there may be a case where none of the cameras of the plurality of illumination devices 1 arranged in the X-axis direction captures an image of the imaging target 12 . On the other hand, when Expression (2) is satisfied, the imaging target 12 is imaged by at least one of the plurality of lighting devices 1 arranged in the X-axis direction. In particular, when b=4.29H-7.09, the imaging target 12 is imaged by the camera of any one of the plurality of illumination devices 1 arranged in the X-axis direction. Therefore, the minimum number of illumination devices 1 can be arranged in the X-axis direction.

Moreover, in the case of H<2 in the formulas (1) and (2), a part of the imaging target 12 may not be imaged. However, the above definition of the height H from the floor surface 11 to the ceiling surface 10 is based on the assumption that the maximum height of the imaging target 12 is 1.6 m or less.

Note that the imaging target 12 may be, for example, an employee moving on the floor 11, or may be a structure installed on the floor 11, wall, or the like of a factory or office.

Further, in the example shown in FIG. 3, an example in which the angle of view θ1 in the width direction of the lighting device 1 is smaller than the angle of view θ2 in the length direction is illustrated, but the present invention is not limited to this. Hereinafter, description will be made with reference to FIGS. 4 and 5. FIG.

FIG. 4 is a diagram showing an arrangement example of the lighting devices included in the lighting system according to the embodiment, and FIG. 5 is a diagram showing an arrangement example (1) of the lighting devices included in the lighting system according to the modified example of the embodiment. be. 4 is an arrangement example of the illumination device 1 shown in FIG. 3, and FIG. 5 is an arrangement example of an illumination device 1A having cameras having the same performance except that the angles of view θ1 and θ2 shown in FIG. 3 are exchanged. , respectively. 4 and 5 correspond to bottom views of the plurality of lighting devices 1 and 1A arranged in the X-axis direction and the Y-axis direction from the floor surface 11 side. Let L be the total length of the illumination devices 1 and 1A. The total length L is not particularly limited as long as the adjacent lighting devices 1A can be arranged appropriately, but can be set to 1.2 m, for example.

Also, in FIG. 4, a1 is the minimum value of the interval a shown in equation (1), and b1 is the minimum value of the interval b shown in equation (2). In FIG. 5, a2 is the minimum value of the spacing a between the lighting devices 1A adjacent in the width direction (Y-axis direction), and b2 is the minimum value of the spacing b between the lighting devices 1A adjacent in the length direction (X-axis direction). be the minimum value.

At this time, a1=L+b2 and a2=L+b1. By arranging the illumination devices 1 and 1A at intervals corresponding to the angles of view θ1 and θ2 in this way, the imaging target 12 can be imaged more reliably.

In addition, in the examples shown in FIGS. 4 and 5, the lighting devices 1 and 1A are arranged so that the length direction is along the X-axis direction, but the arrangement is not limited to this. FIG. 6 is a diagram illustrating an arrangement example (2) of lighting devices included in a lighting system according to a modification of the embodiment; FIG. 6 illustrates an example in which the illumination device 1A shown in FIG. 5 is arranged so that the length direction is along the Y-axis direction.

Comparing FIGS. 5 and 6, although the design of the lighting system differs depending on the shape of the space including the ceiling surface 10, the intervals a2 and b2 between the adjacent lighting devices 1A are the same. In this manner, by appropriately arranging the plurality of lighting devices 1A at predetermined intervals based on the angles of view θ1 and θ2 of the cameras and the distance to the imaging target 12, regardless of the arrangement direction of the lighting devices 1A, the imaging target 12 can be imaged more reliably.

Thus, the lighting system 100 according to the embodiment includes a plurality of lighting devices 1 and 1A. The illumination devices 1 and 1A each have an illumination section 2 and a camera 32 . The lighting section 2 has a plurality of light emitting elements. The camera 32 is adjacent to the lighting section 2 . The plurality of lighting devices 1 and 1A are arranged at intervals based on the angle of view of the camera 32 and the distance from the lighting devices 1 and 1A to the imaging target 12 . Therefore, the imaging target 12 is reflected in one of the cameras 32 of the plurality of lighting devices 1 and 1A, and the imaging target 12 can be imaged more reliably.

In the above-described embodiment, the angles of view θ1 and θ2 of the camera 32 are different from each other, but they may be the same.

Further, in the above-described embodiment, the distances a and b between the lighting devices 1 and 1A are set so as to satisfy the expressions (1) and (2), but the present invention is not limited to this. For example, the intervals a and b may be defined to increase as the distance d to the imaging target 12 increases. Alternatively, the intervals a and b may be defined to increase as the angle of view of the camera to be used increases. Alternatively, the intervals a and b may be set based on a range in which the brightness of the irradiation target exceeds a predetermined threshold.

Furthermore, regardless of the above formulas (1) and (2), based on an equation calculated based on various parameters such as the assumed distance d to the imaging target 12, the brightness with which the irradiation target is illuminated, and the angle of view of the camera Intervals a and b may be set by

Further, in the above-described embodiment, the camera 32 is arranged at the end of the illumination unit 2 in the length direction, but it is not limited to this, and may be arranged at the center of the illumination devices 1 and 1A, for example.

Further, in the above-described embodiment, the lighting system 100 has been described as including the lighting devices 1 and 1A that are directly attached to the ceiling. Also, the lighting devices 1 and 1A may be attached to, for example, a wall surface instead of the ceiling surface 10 .

While embodiments of the invention have been described, the embodiments have been presented by way of example and are not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

1, 1A lighting device 2 lighting unit 3 imaging unit 12 imaging target 32 camera 100 lighting system

Claims (6)

A plurality of lighting devices each having a lighting section having a plurality of light emitting elements and a camera adjacent to the lighting section;
and
The plurality of lighting devices are arranged such that the imaging target is reflected in one of the cameras, and the angle of view of the camera and the imaging target from the lighting device are such that the brightness with which the imaging target is illuminated exceeds a predetermined threshold. A lighting system, characterized in that the lighting system is spaced based on the distance to and from. 2. The lighting system of claim 1, wherein the plurality of lighting devices are arranged along the length direction of the lighting devices. 3. The lighting system according to claim 1, wherein the plurality of lighting devices are arranged along the width direction of the lighting device. 4. The lighting system according to any one of claims 1 to 3, wherein the camera is arranged at a longitudinal end of the lighting section. The lighting system according to any one of claims 1 to 4, wherein the camera has different angles of view in the length direction and the width direction of the lighting section. The lighting system according to any one of claims 1 to 5, wherein the plurality of lighting devices are arranged at a distance of 2 m or more from a predetermined irradiation surface.

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