JP2015087200A - Illuminance detector, and task lighting device including illuminance detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an intelligent lighting system, such as ambient lighting, at low costs by improving usability of an illuminance detector photographed by a camera.SOLUTION: An illuminance detector includes: a light diffusion part photographed by a camera to obtain illuminance of ambient lighting; a support part that supports the light diffusion part at a predetermined height; and a pedestal part to which the support part is attached.

Description

  The present invention relates to an illuminance detector and a task illumination device for controlling dimming of illumination by photographing with a camera.

  In recent years, research on intelligent lighting systems that realize individual illuminance environments for the purpose of energy saving has been conducted. By introducing this intelligent lighting system into dimmable ambient lighting and optimally controlling the ambient lighting, further energy savings are expected.

  This intelligent lighting system is composed of a lighting device such as a fluorescent lamp, an illuminance meter, a lighting control device, and a power meter, and these are connected to one network. Then, the luminous intensity of the lighting device is controlled by the lighting control device so that the target illuminance set in the illuminance meter placed at an arbitrary place is obtained.

  However, the illuminance meter requires a transmitter for transmitting the measured illuminance and the target illuminance in addition to the sensor unit, the illuminance calculation unit, etc., and also requires a power source for demonstrating these functions. It is what. Therefore, the manufacturing cost per unit is very high, and when a large number of illuminance meters are installed and used, there is a problem that the entire illumination system becomes expensive.

  Therefore, Patent Document 1 proposes an illuminance measuring device and an illuminance detector that can reduce the manufacturing cost. Specifically, as shown in FIG. 9, the illuminance measurement device 140 is disposed above the illuminance measurement region, with the illuminance detector 142 disposed at the illuminance measurement location below the illumination device 141 such as a fluorescent lamp. The illuminance acquisition device 143 is configured.

  The illuminance detector 142 includes an illuminance detection member 153 having a predetermined diffuse reflectance. The illuminance acquisition device 143 includes a camera 161 that captures the illuminance detector 142 and a processing calculation unit 162 that acquires illuminance from the image.

  The illuminance measurement device 140 of Patent Document 1 captures the illuminance detector 142 with the camera 161 and acquires the current illuminance using a gray scale value based on image data obtained by capturing the illuminance detection member 153 of the illuminance detector 142. For this reason, since it is not necessary to provide a sensor part, a calculation part, a transmission part, a power supply part, etc. in the illuminance meter itself, the configuration of the illuminance detector 142 becomes very simple, and the production cost can be reduced. In particular, when a large number of illuminance measuring means are required in the illumination system, it is further advantageous in terms of cost.

JP 2010-71702 A

  However, in the illuminance measuring device 140 of Patent Document 1, if the illuminance detection member 153 is hidden by placing an article on the illuminance detector 142 or the like, the camera 161 cannot detect accurate illuminance, so Careful attention must be paid to the mounting state of the detector 142.

  Therefore, an object of the present invention is to improve the usability of an illuminance detector photographed by a camera and to realize an intelligent lighting system such as ambient lighting at a low cost.

  An illuminance detector according to the present invention includes a light diffusing unit photographed by a camera to obtain illuminance by ambient illumination, a support unit that supports the light diffusing unit at a predetermined height, and a pedestal unit to which the support unit is attached. It is characterized by providing.

  In the illuminance detector, the light diffusing unit diffuses and reflects the first illumination light from the ambient illumination, and the luminance of the light diffusing unit is configured to be substantially constant regardless of the viewpoint of the camera. Features.

  In the illuminance detector, the light diffusing portion has a spherical shape.

  In addition, the task illumination device includes an illuminance detector, and a task illumination unit is provided below the light diffusion unit.

  In the task lighting device, the light diffusing unit is formed of a semi-transmissive member, and the second illuminating light of the task lighting unit is configured to transmit upward from the light diffusing unit.

  According to the illuminance detector of the present invention, the usability of the illuminance detector photographed by the camera can be improved, and an intelligent lighting system such as ambient lighting can be realized at low cost.

It is a perspective view which shows schematic structure of the illumination intensity detector which concerns on Example 1 of this invention. It is a figure which shows the shape of the light-diffusion part with which the illumination intensity detector of this invention is provided. It is a block block diagram of the light control apparatus which controls light control of ambient illumination using the illumination intensity detector of this invention. It is a perspective view of the living room which built the intelligent lighting system using the illumination intensity detector of the present invention. It is a figure showing the relationship between the pixel value and the brightness | luminance of the image image | photographed with the camera. It is the image of the living room image | photographed with the camera. It is a perspective view which shows schematic structure of the task lighting apparatus provided with the illumination intensity detector which concerns on Example 2 of this invention. It is sectional drawing of the light-diffusion part and task lighting part in the task lighting apparatus of Example 3 of this invention. It is a schematic diagram of the conventional illuminance measuring device and illuminance detector.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.

  FIG. 1 is a perspective view showing a schematic configuration of an illuminance detector 10 according to Embodiment 1 of the present invention. The illuminance detector 10 includes a light diffusing unit 11, a support unit 12, and a pedestal unit 13. The light diffusing unit 11 diffuses and reflects the first illumination light of ambient illumination that can be dimmed. The support unit 12 supports the light diffusing unit 11 and is disposed at a predetermined height from the floor or desk. The pedestal portion 13 is for stably placing the support portion 12 supported by the light diffusing portion 11 on the illuminance detection location.

  The illuminance detector 10 of the present invention supports the light diffusing unit 11 at a predetermined height with the support unit 12 so that the light diffusing unit 11 is not hidden by the article, and can reliably shoot with the camera. This improves the usability of the illuminance detector 10 without making the operator aware of the illuminance detector 10.

  The light diffusing unit 11 provided in the illuminance detector 10 is ideally a Lambertian reflecting surface. Lambertian reflection is also called Lambertian reflection, uniform diffuse reflection, and complete diffuse reflection. The Lambertian reflection of the surface of an object means that the brightness of the surface viewed from the observer becomes the same regardless of the angle of the observer's viewpoint due to scattering of the light incident on the surface.

  In the illuminance detector 10 of the present invention, the luminance of the light diffusing unit 11 is accurately measured without depending on the positional relationship between the light diffusing unit 11 and the camera by bringing the light diffusing unit 11 close to the Lambertian reflecting surface. be able to. Furthermore, on the Lambertian reflecting surface, the luminance and the illuminance are in a proportional relationship, and the illuminance can be accurately converted from the luminance. That is, the luminance can be calculated from the pixel value of the light diffusing unit 11 shown in the camera image, and further converted from luminance to illuminance.

  Such an illuminance detector 10 is placed in a place illuminated by ambient illumination, the light diffusing unit 11 of the illuminance detector 10 is photographed by a camera, and the illuminance by the ambient illumination is calculated from the image of the light diffusing unit 11. be able to. Therefore, by using the illuminance detector 10 of the present invention, an intelligent lighting system that appropriately controls the dimming of ambient lighting can be realized at low cost.

  FIG. 2 is a schematic cross-sectional view showing the shape of the light diffusing unit 11 provided in the illuminance detector 10 of the present invention. For example, the light diffusing portion 11 can be formed with a light diffusing surface having a planar shape (a), but the light diffusing surface has a spherical shape with a convex upward (b), and a spherical shape with a concave downward. The shape (c) is desirable. The spherical shape means a part of a spherical surface cut by a split plane.

  When the light diffusing unit 11 of the illuminance detector 10 has a planar shape, the light diffusing unit 11 may be reduced in size depending on the viewpoint of the camera. When the size of the photographed light diffusing unit 11 changes, problems such as undetected in which the light diffusing unit 11 is not recognized and overdetection in which another object is erroneously recognized as the light diffusing unit 11 occur. On the other hand, if the light diffusing unit 11 has a spherical shape, the light diffusing unit 11 can be photographed with substantially the same size regardless of the viewpoint of the camera. It is possible to prevent undetected and overdetected problems.

  Furthermore, the light diffusing unit 11 may be other than a hemispherical shape as long as it is easily identified by the camera, and may be, for example, a cone, a polygonal pyramid, a cylinder, or a polygonal column. Alternatively, the light diffusing unit 11 may have a unique shape that does not exist in the office so that it can be easily identified by the camera. If this unique shape is registered in the image processing unit in advance, it is possible to prevent the light diffusing unit 11 from being undetected or overdetected. In addition, if the spherically crowned shape (c) is recessed downward, the operator does not directly observe the reflected light from the light diffusing unit 11 and may feel dazzled or the concentration of work may be off. There is no.

  FIG. 3 is a block configuration diagram of a dimming control device 40 for performing dimming control of the ambient illumination 20 using the illuminance detector 10 of the present invention. The dimming control device 40 controls, for example, the brightness of the ambient illumination 20 installed on the ceiling of an office or the like. Using the image obtained by photographing the illuminance detector 10 of the present invention with the camera 30, The illuminance of the ambient illumination 20 is calculated, and a dimming signal is generated and output to the ambient illumination 20. The dimming control device 40 includes a synthesis unit 41, a brightness calculation unit 42, a human detection unit 43, and a control unit 44.

  The ambient lighting 20 incorporates a light source such as an LED, a fluorescent lamp, and a light bulb to illuminate a living room such as an office. The illuminance detector 10 is disposed in a work area in the living room, and includes a light diffusing unit 11 that diffusely reflects the illumination light of the ambient illumination 20. The camera 30 is installed at a position for photographing the work area where the illuminance detector 10 is arranged.

  The camera 30 changes the exposure time, takes a plurality of images, and outputs them to the light control device 40. The synthesizing unit 41 synthesizes a plurality of images input from the camera 30 and outputs them to the brightness calculating unit 42 and the human feeling unit 43. The image synthesizing process by the synthesizing unit 41 will be described later.

  The brightness calculation unit 42 calculates brightness information corresponding to the illuminance of the ambient illumination 20 from the pixel value of the light diffusing unit 11 of the illuminance detector 10 captured in the composite image. This brightness information corresponds to the brightness with which the illumination of the ambient illumination 20 illuminates the light diffusing unit 11.

  The human presence means 43 detects the presence or absence of a person from the work area shown in the composite image, and calculates human presence information. This human information represents the presence or absence of a person in a predetermined area of the work area. The control unit 44 generates a dimming signal in consideration of energy saving using the brightness information and the human feeling information, and outputs the dimming signal to the ambient illumination 20. The dimming signal corresponds to a set value of the light output value of the ambient lighting 20, and the ambient lighting 20 changes the output of the illumination light according to the dimming signal.

  FIG. 4 is a perspective view showing an example of an intelligent lighting system in which the illuminance detector 10 of the present invention, the ambient lighting 20, the camera 30, and the light control device 40 are arranged in a living room 70. For example, it is assumed that four desks 71-1 to 7-4 are arranged in the living room 70, and a window 72 is provided on the wall surface. Since the outside light is radiated from the window 72 on the wall surface in the living room 70, the desk 71 closer to the window 72 can obtain sufficient brightness during daylight and the like. It is desirable to darken the lighting directly above.

  For this reason, the dimmable ambient lighting 20-X is installed immediately above each desk 71-X (X is 1, 2, 3, 4), and each desk 71-X has the ambient lighting 20-X. An illuminance detector 10-X that detects illuminance is arranged. As a result, a person using the desk 71-X can work under illumination that is appropriately dimmed by the ambient lighting 20-X. The ambient lighting 20-X may be one or more, and an appropriate number may be installed according to the size of the living room 70.

  The illuminance detector 10-X has sufficient brightness illuminated from the ambient illumination 20-X without an article such as a stationery placed on the light diffusing unit 11-X or a shadow of the article such as the stationery entering the light diffusing unit 11-X. It is desirable that the light diffusing unit 11 is supported at a position higher than that on the desk 71-X.

  The camera 30 is installed at a high place where all the desks 71-X and the illuminance detector 10-X can be photographed. Here, a wide-angle camera is used as the camera 30 to shoot the whole image with one camera, but a plurality of cameras may be used for shooting. The camera 30 may be provided with a fisheye lens.

  The camera 30 captures a plurality of gray scale images with different exposure times and outputs them to the light control device 40. First, the dimming control device 40 combines a plurality of images captured by the camera 30 by the combining unit 41 to generate a grayscale luminance image.

  FIG. 5 is a diagram showing the relationship between the pixel values of images taken at different exposure times T0 to T3 and the brightness of the taken area. Curves S0 to S3 indicating the relationship between the pixel value and the luminance are taken with exposure times T0 to T3, respectively, and good linearity is obtained in a range where the pixel value is 20 to 200. Using the range in which this linearity is obtained, the pixel value can be converted into luminance.

  Here, in one shooting with the camera 30, for example, only the luminance in the range of L0 to L1 can be detected. However, by changing the exposure time of the camera 30 and synthesizing images taken four times, it is possible to detect the luminance from the range of L0 to L4, and the dynamic range can be expanded about four times. For example, if one image has 8 bits and 256 gradations, the luminance of 10 bits and 1024 gradations can be detected by combining the four images.

  FIG. 6 is a composite image of the room 70 taken by the camera 30. In this image, a portion where each desk 71-X and its periphery are photographed is set as a first predetermined area 31-X. In the first predetermined area 31-X, for example, a range in which a person is detected in the area and the illumination just above is to be turned on is set.

  The synthesized image synthesized by the synthesizing unit 41 is output to the brightness calculating unit 42 to calculate brightness information. In addition, the synthesized image is output to the human means 43 to calculate human information.

  The brightness calculation means 42 detects the illuminance detector 10-X from the image of the first predetermined area 31-X. Further, the brightness calculation means 42 extracts one or more pixel values that the light diffusing unit 11 shows from the image of the illuminance detector 10 -X, and calculates brightness information corresponding to the illuminance of the ambient illumination 20.

  The control means 44 compares the calculated brightness information with the target value, and if the brightness information is lower than the target value, sets the dimming signal to make it brighter. On the other hand, if the brightness information is higher than the target value, the dimming signal is set so as to make it darker. If the brightness information is equal to the target value, the current dimming signal is maintained.

  Therefore, when the brightness information is too bright, the corresponding ambient lighting 20-X illuminates with the brightness reduced by the adjusted dimming signal. If the brightness information is too dark, the corresponding ambient lighting 20-X illuminates with the brightness adjusted by the adjusted dimming signal.

  On the other hand, the dimming control device 40 detects the presence / absence of a person working in the first predetermined area 31-X by the human means 43. The human means 43 detects the presence or absence of a person by performing image processing such as a background difference method, an inter-frame difference method, or a pattern recognition method on the input composite image.

  The human means 43 can detect the presence or absence of a person with high accuracy by using a composite image with a wide dynamic range, because even if there is a person in the dark, the image is taken without being blacked out. . Further, even when there is a person near the window on a clear day, since the person is photographed without whiteout, the presence or absence of the person can be detected with high accuracy.

  When there is a person in the first predetermined area 31-X, the control unit 44 turns on the corresponding ambient illumination 20-X. In addition, when there is no person in the first predetermined area 31-X, the control unit 44 turns off the corresponding ambient lighting 20-X.

  Alternatively, the ambient light 20-X corresponding to the first predetermined area 31-X where the person is present is turned on by the control means 44 for 100% (or 100% of the brightness adjusted by the brightness information), and the surrounding area 50% (or 50% of the brightness adjusted by the brightness information) is turned on, and the dimming signal may be output so that the other unattended areas are turned off.

  As described above, the dimming control device 40 extracts the brightness information and the human feeling information from the light diffusing unit 11 of the illuminance detector 10-X and the first predetermined area 31-X that are captured in the image, and the ambient light is extracted. By adjusting the dimming signal of the lighting 20-X, energy saving in the office is realized.

  The external light quantity varies depending on the time and season, and the performance of the illuminance detector 10, the ambient lighting 20, the camera 30, the dimming control device 40, etc. that constructs the intelligent lighting system changes over time. The brightness of the ambient light 20 that is dimmed may change slightly.

  Moreover, since the brightness perceived as appropriate varies depending on the operator, it is desirable that the dimming control device 40 can appropriately change the target value set in the control means 44. Thereby, when the operator feels that the brightness of the automatically adjusted ambient lighting 20 is too bright or too dark, the operator appropriately resets the target value of the dimming control device 40. Thus, dimming according to the preference can be performed.

  As described above, the intelligent illumination system using the illuminance detector 10 of the present invention, the ambient illumination 20, the camera 30, and the dimming control device 40 has been described. However, in the intelligent illumination system using the illuminance detector 10 of the present invention, Various modifications are possible without being limited to the present embodiment.

  For example, although the light control device 40 includes the human feeling means 43, the light adjustment control apparatus 40 may perform only the light adjustment by the brightness calculating means 42 without performing the light adjustment by the human feeling means 43.

  In the above-described combining unit 41, different exposure times are set in advance as T0 to T3. However, the control unit 44 may instruct the camera of the exposure time as appropriate. Specifically, different exposure times may be determined so that the pixels included in the light diffusing unit 11 and the first predetermined area 31 in the image captured by the camera do not have whiteout or blackout. In this way, it is not always necessary to perform four shootings, and the light control can be performed by reducing the number of shootings. As a result, the power consumption of the apparatus can be reduced and energy saving can be realized.

  In the above-described combining unit 41, the case where the gray scale image is combined and the gray scale luminance image is output has been described. However, when the human means 43 detects a person from the composite image, it is preferably a color composite image rather than a gray scale. By using a color composite image, the composite image is further enhanced in gradation, and it is possible to easily distinguish people from other objects such as floors, desks, walls, windows, etc. Can be detected.

  For example, if the photographed color image is 8 bits 256 gradations and 24 bits color for RGB, the combined color image can be 10 bits 1024 gradations and 30 bits color for RGB.

  Furthermore, the dimming control device 40 may include gesture recognition means for recognizing a gesture operated by a person. Gesture recognition is a well-known technique, but an image captured by a camera may cause overexposure or blackout, and it is difficult to recognize a gesture with such an image. In addition, due to the dimming of the illumination, the brightness for recognizing the gesture motion becomes excessive and insufficient, and the gesture cannot be recognized accurately.

  In the dimming control device 40 using the illuminance detector 10 of the present invention, by using a composite image with a wide dynamic range as a gesture recognition means, the above-mentioned problems can be solved and a gesture can be recognized accurately. Is.

  For example, the gesture recognizing unit sets a second predetermined area for performing gesture recognition on the synthesized image generated by the synthesizing unit 41, and recognizes the gesture by performing image processing on the second predetermined area. The gesture information detected by the gesture recognition unit is output to the control unit 44.

  The control means 44 accepts gesture information other than the brightness information and the human information described above, and sets a dimming signal instructed by the gesture. The gestures instruct the lighting dimming method, such as full lighting, turning off, increasing the illuminance, decreasing the illuminance, canceling the previous gesture instruction, and the like. These instructions can be determined by the operation of a finger, hand, or arm, or the light spot trajectory can be determined as a gesture by moving a lighted mobile phone or flashlight.

  By adding gesture recognition means to the dimming control device 40, the illumination can be dimmed by a gesture operation, so that there is no need to use a dimming remote control, and convenience can be improved.

  The second predetermined area for performing gesture recognition may be the same as the first predetermined area 31 for detecting the presence or absence of a person. Alternatively, the second predetermined area may be a part of the first predetermined area 31 and may be an operation range such as a finger, a hand, and an arm that perform a gesture. The second predetermined area can be set to an area above the first predetermined area 31 and a gesture of raising the hand over the head can be used.

  The gesture recognizing unit may use pixel information in which the presence / absence of the person and the presence of the person are detected by the human detecting unit 43. The pixel information in which a person exists is, for example, a binary image in which a pixel having a person is 1 and a pixel having no person is 0. Alternatively, the pixel information in which a person exists is an image depicting a person's outline. By using these pieces of information, gesture recognition can be performed with higher accuracy. When the arrangement of desks, partitions, etc. is changed in an office or the like, the setting values of the first predetermined area 31 and the second predetermined area may be changed after the arrangement change.

  FIG. 7 is a perspective view showing a schematic configuration of a task illumination device 50 including the illuminance detector 10 according to the second embodiment of the present invention. The task illumination device 50 according to the second embodiment includes a light diffusing unit 11, a support unit 12, and a pedestal unit 13, as with the illuminance detector 10, and a task illumination unit 60 is provided below the light diffusing unit 11. It has become.

  The task lighting device 50 is used, for example, to illuminate a work area on a desk from a short distance. The task illumination unit 60 incorporates a light source such as an LED, a fluorescent lamp, or a light bulb, and illuminates the work area immediately below. The light diffusing unit 11 is disposed on the task illumination unit 60 and diffusely reflects the illumination from the ambient illumination 20 installed on the ceiling without affecting the illumination of the task illumination unit 60. In addition, in order to adjust the height and position of the task illumination unit 60 and the light diffusion unit 11, the support unit 12 may be provided with the attitude adjustment unit 51.

In the task lighting device 50 according to the second embodiment, the light diffusing unit 11 is integrated with the task lighting unit 60.
(1) The light diffusing unit 11 can accurately measure the brightness of the illumination from the ambient illumination 20 without being affected by the illumination from the task illumination unit 60.
(2) The task illumination device 50 including the illuminance detector 10 is provided at low cost by sharing the support portion 12 and the pedestal portion 13 that support the light diffusion portion 11 as members constituting the task illumination device 50. be able to.
(3) Since it is not necessary to separately install the illuminance detector 10 and the task lighting device 50 in the work area, the work area can be effectively used.
(4) Since the use of the task lighting device 50 is almost the same as that of a normal task lighting device that does not include the light diffusing unit 11, the operator can concentrate on the work without feeling uncomfortable without being aware of the light diffusing unit 11. There are effects such as being able to.

  The task lighting device 50 according to the third embodiment is configured to emit a part of the second illumination light from the task lighting unit 60 upward and transmit the light diffusing unit 11. Since the configuration other than the task illumination unit 60 and the light diffusion unit 11 is the same as the configuration of the second embodiment, detailed description thereof is omitted.

  FIG. 8 is a cross-sectional view of the light diffusing unit 11 and the task lighting unit 60 in the task lighting device 50 of the third embodiment. The task illumination unit 60 includes an upper plate 61, a reflection plate 62, a light source 63, and a diffusion plate 64.

  In the task illumination device 50 according to the second embodiment, the light emitted from the light source 63 passes through the diffusion plate 64 and is uniformly illuminated on the work area immediately below, and the light emitted upward from the light source 63 is reflected on the reflection plate 62. The light is reflected downward and passes through the diffusion plate 64 so that the work area immediately below is uniformly illuminated. As described above, the task illumination device 50 according to the second embodiment is configured such that the light emitted from the light source 63 illuminates the lower work area without waste.

  On the other hand, in the task lighting device 50 according to the third embodiment, the circular portion where the bottom surface of the light diffusing unit 11 contacts is cut out in the upper plate 61 and the reflecting plate 62, and light is transmitted to the light diffusing unit 11. It is composed of a translucent member that transmits.

  In the task lighting device 50 according to the third embodiment, the upper plate 61 and the reflecting plate 62 are partly cut out from a part of the second illumination light emitted from the task lighting unit 60 according to the above configuration. Is passed through the bottom surface of the sphere and irradiated to the inside of the light diffusion portion 11. Further, the second illumination light irradiated on the inner side of the light diffusion portion 11 is diffused by the light diffusion portion 11 and emitted upward.

  Therefore, in the task illumination device 50 of the third embodiment, the first illumination light of the ambient illumination 20 is diffusely reflected by the light diffusing unit 11 provided on the upper side of the task illumination unit 60, and the first illumination light of the task illumination unit 60 is reflected. A part of the illumination light of 2 is also diffusely reflected together.

  For this reason, the actual brightness of the work area where the first illumination light of the ambient illumination 20 and the second illumination light of the task illumination device 50 are added is measured by photographing the light diffusing unit 11 with the camera 30. be able to. Therefore, the task lighting device 50 according to the third embodiment adjusts the brightness based on the illuminance from the light diffusing unit 11, thereby taking into account the brightness of the second lighting light of the task lighting device 50. It is possible to prevent the illumination light of 1 from being brightened more than necessary, and to save energy by corresponding to the environment of the work area.

  As the task lighting device 50 of the fourth embodiment, in the task lighting device 50 of the third embodiment, a shutter mechanism is provided in a portion where the upper plate 61 and the reflection plate 62 are cut out, and the second illumination light of the task lighting device 50 is supplied. Whether or not the light diffusing unit 11 transmits the light may be switched. Accordingly, the task lighting device 50 according to the second embodiment can be used when the shutter is closed, and the task lighting device 50 according to the third embodiment can be used when the shutter is opened. The task lighting device 50 can be realized simultaneously.

  The illuminance detector of the present invention is not limited to the use of dimming of office lighting for control, but can also be used for lighting control in stores, factories, meeting halls, homes, parking lots, bicycle parking lots, and the like.

DESCRIPTION OF SYMBOLS 10 Illuminance detector 11 Light-diffusion part 12 Support part 13 Base part 20 Ambient illumination 30 Camera 40 Light control device 41 Composition means 42 Brightness calculation means 43 Human sense means 44 Control means 50 Task illumination device 51 Attitude adjustment part 60 Task illumination Part

Claims (5)

A light diffusing section photographed by a camera to obtain illuminance by ambient lighting;
A support part for supporting the light diffusion part at a predetermined height;
An illuminance detector, comprising: a pedestal portion to which the support portion is attached.   The light diffusing unit diffuses and reflects the first illumination light from the ambient illumination, and the luminance of the light diffusing unit is configured to be substantially constant regardless of the viewpoint of the camera. The illuminance detector according to claim 1.   The illuminance detector according to claim 2, wherein the light diffusion portion has a spherical shape. A task lighting device comprising the illuminance detector according to claim 1,
A task illumination device, wherein a task illumination unit is provided below the light diffusion unit.   The said light-diffusion part is formed with the semi-transmissive member, It is comprised so that the 2nd illumination light of the said task illumination part may permeate | transmit upwards from the said light-diffusion part. Task lighting equipment.