A system for measuring lighting

Abstract

To provide a system that can easily measure light reflected on a building material, or the like.SOLUTION: A system includes a holding portion that holds a building material, a plurality of lightings that emit light, a support portion that supports the plurality of lightings and changes a target lighting that is a lighting that irradiates the building material with light among the plurality of lightings, and a measuring device that measures reflected light that is light reflected on the building material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a system for measuring illumination. [Background technology]

[0002] Conventional technology has involved using devices to measure the illuminance of lighting in order to ensure proper use of lighting (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2006-302517 [Overview of the project] [Problems that the invention aims to solve]

[0004] Traditionally, even if it was possible to measure the light emitted by lighting, measuring the light reflected from building materials and other surfaces was a time-consuming process. [Means for solving the problem]

[0005] In view of the above problems, the present invention provides, in one aspect, a system comprising: a holding part for holding building materials; a plurality of lights for irradiating light; a support part for supporting the plurality of lights and changing the target light which is one of the plurality of lights that irradiates light onto the building materials; and a measuring instrument for measuring reflected light which is light reflected from the building materials. [Effects of the Invention]

[0006] According to the present invention, a system can be provided that can easily measure light reflected from building materials and the like. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the evaluation system in the embodiment, showing (a) a front view and (b) a rear view. [Figure 2] It is a schematic diagram of the model simulated by the evaluation system. [Figure 3] It is a diagram showing the functional configuration of the evaluation system. [Figure 4] It is a flowchart of the process executed in the evaluation system. [Figure 5] It is a diagram showing an example of a color space in which coordinates corresponding to reflected light and reference coordinates are plotted. [Figure 6] It is a mathematical formula showing the relationship between the stimulus value and the coordinates in the CIELUV color space. [Figure 7] It is a calculation formula for the distance used in the evaluation. [Figure 8] It is an example of a contour diagram showing the distribution of the distance L1 of the reflected light on the building material, and shows the range where the distance L1 is greater than the threshold value. [Figure 9] It is a mathematical formula showing the relationship between the stimulus value and the coordinates in the CIELAB color space. [Figure 10] It is a mathematical formula showing the relationship between the stimulus value and the color space coordinates in the XYZ colorimetric system.

Mode for Carrying Out the Invention

[0008] Hereinafter, the evaluation system 10, which is one of the embodiments of the present invention, will be described using each figure.

[0009] As shown in FIGS. 1 and 3, the evaluation system 10 includes a measuring machine 1, a holding unit 2, a lighting unit 3 having a lighting fixture 32, a control device 4 (described in FIG. 3), and a building material 5. The measuring machine 1, the holding unit 2, the lighting unit 3, and the building material 5 are installed on the work floor F. In the following description, as shown in FIGS. 1 and 2, the vertical direction is defined along the direction of gravity.

[0010] The evaluation system 10 is a system for assisting in formulating an appropriate lighting plan by simulating the arrangement of the lighting IL and the inner wall IW used in the model M targeted by the lighting plan, and measuring and evaluating the reflection of light perceived at the point MP in the space.

[0011] In Model M, as shown in Figure 2, the lighting fixture IL installed on the ceiling is positioned above, and below it, the interior wall IW is positioned to extend vertically. In the evaluation system 10, the lighting unit 3, building material 5, measuring instrument 1, and the X, Y, and Z axes correspond to the lighting fixture IL, interior wall IW, point MP, and the X, Y, and Z axes, respectively, in Model M.

[0012] As clearly shown in Figures 1 and 2 regarding the relationship between the XZ axes and the vertical direction, the evaluation system 10 simulates the configuration of model M in a horizontal orientation to facilitate the work. More specifically, in model M, the Z axis coincides with the vertical direction, while in evaluation system 10, the Y axis coincides with the vertical direction. The lighting fixture 32, building materials 5, and measuring instrument 1 correspond to the lighting IL, interior wall IW, and point MP in model M.

[0013] Furthermore, the distance x1 between the measuring instrument 1 and the building material 5 coincides with the distance x11 between point MP and the interior wall IW, and the distance x2 between the lighting fixture 32 and the building material 5 coincides with the distance x12 between the lighting IL and the interior wall IW. The distance z1 between the measurement position on the building material 5 and the lighting fixture 32 coincides with the distance z11 between the measurement position on the interior wall IW and the lighting IL, and the distance z2 between the lighting fixture 32 and the building material 5 coincides with the distance z12 between the lighting IL and the interior wall IW (Figures 1 and 2).

[0014] Measuring instrument 1 is a two-dimensional colorimeter, a device that measures the distribution of luminance and color information of light reflected from building material 5 (hereinafter also referred to as reflected light). Measuring instrument 1 can measure the stimulus values ​​(tristimulus values) of the three colors that make up the reflected light, and their distribution in the two-dimensional direction.

[0015] As shown in Figure 1(b), the holding part 2 is a member formed in the shape of a right triangle in the Z-axis direction and holds the building material 5 from the back.

[0016] Building material 5 is a flat, plate-shaped component. The same building material used for interior wall IW is used for building material 5. For example, the wood used for interior wall IW is used for building material 5.

[0017] The lighting unit 3 comprises a support section 31 formed in the shape of a rectangular prism, four lighting fixtures 32A, 32B, 32C, and 32D (lighting fixture 32 is a collective term for these), and a motor 33 that provides power to rotate the support section 31 (Figure 1). Note that the support section 31 may be formed in a shape other than a rectangular prism, such as a hexagonal prism, or it may be formed in a cylindrical shape. Also, the lighting unit 3 may be formed in a cylindrical shape instead of a columnar shape.

[0018] The support portion 31 is formed to extend vertically and has four sides 31A-31D. Each of the sides 31A-31D holds one lighting fixture 32A-32D.

[0019] The support unit 31 is rotatable around an axis extending vertically, using the power of the motor 33. As the support unit 31 rotates, the positions of the lighting fixtures 32A-32D supported by it are also changed. As a result, one of the lighting fixtures 32A-32D can be moved to the illumination position EP, where it can irradiate light onto the building material 5.

[0020] The lighting fixtures 32A-32D will be those intended for use in the space covered by the lighting plan. Lighting fixtures 32A-32D are of different types, and specific examples include downlights and spotlights. Note that "differences in lighting fixture types" include not only differences in output and light-emitting elements, but also differences in the installation angle of lighting fixture 32, the direction of light irradiation, and the spread of light.

[0021] The installation positions of the lighting fixtures 32A-32D on sides 31A-31D are set based on the actual assumed lighting plan. For example, when installed at illumination position EP as shown in Figure 1, the distance x2 from building material 5 for lighting fixture 32A and the distance x2 from building material 5 for lighting fixture 32B may be different dimensions.

[0022] The motor 33 has its output shaft connected to the support section 31 via a reduction gear, and the support section 31 can be rotated around an axis that extends vertically.

[0023] As shown in Figure 3, the control device 4 is connected to the measuring instrument 1 in a communicative manner and can acquire the measurement results of the reflected light measured by the measuring instrument 1. Furthermore, the control device 4 can analyze the acquired data.

[0024] In addition, the control device 4 is connected to the lighting unit 3 in a communication manner and can control the operation of the lighting unit 3. Specifically, the control device 4 can control the operation of the motor 33 and the output of the lighting fixture 32. Alternatively, the control device 4 may not communicate with the lighting unit 3, and the operation of the lighting unit 3 may be controlled manually.

[0025] The control unit 4 is a computer equipped with a processing unit 41 that performs calculations, such as a CPU (Central Processing Unit), and a storage device 42, such as an HDD (Hard Disk Drive) or RAM (Random Access Memory). The processing unit 41 of the control unit 4 can perform various processes as shown below by starting a program stored in the storage device 42.

[0026] <Implementation Flow> The process of determining the evaluation method implemented in the evaluation system 10 will be explained using the flowchart in Figure 4.

[0027] First, in step S1, the control device 4 sets the lighting and measurement position. Based on the control of the control device 4, the support unit 31 rotates, and one of the lighting fixtures 32A-32D is positioned at the irradiation position EP as the target lighting for measurement. The position of the measuring instrument 1 is also adjusted. As a result, distances x1, x2, z1, and z2 are set to appropriate values. In the following explanation, we will assume that lighting fixture 32A is installed at the irradiation position EP as shown in Figure 1.

[0028] In the next step, S2, light is irradiated from the irradiation device 32A onto the building material 5, and the reflected light is measured by the measuring device 1.

[0029] The control device 4 acquires three stimulus values as measurement results from the measuring instrument 1 and performs conversion to coordinates in the color space as follows (S3). The control device 4 converts the measurement result of the measuring instrument 1 into coordinates in the color space. Also, the control device 4 plots the color of the reflected light in the color space. As a result, the color of the reflected light is displayed in the color space as shown in FIG. 5.

[0030] The conversion from the three stimulus values to coordinates in the color space is executed based on Equations 1 to 10 in FIG. 6.

[0031] FIG. 5 shows L u * v * In the u * coordinate v * coordinate in the color space of the colorimetric system, and a point P1 located at the coordinate indicating the color of the reflected light at this u * coordinate v * coordinate. In FIG. 5, the horizontal axis represents u * and the vertical axis represents v * .

[0032] Note that the type of color space and colorimetric system used for plotting the reflected light is not particularly limited. As examples of specific colorimetric systems, in addition to the above L * u * v * colorimetric system, there are also the L * a * b * colorimetric system, the XYZ colorimetric system, etc. The color space to be used is, for example, preset by the user. As an example, the calculation formulas for the coordinates in the L * a * b * colorimetric system and the XYZ colorimetric system are shown in FIGS. 9 and 10, respectively.

[0033] (Reference point) Next, the control device 4 evaluates the reflected light (S4). The evaluation is executed by comparing the coordinate indicating the color of the reflected light with the coordinate of the reference point.

[0034] As shown in Figure 5, a reference point RP1 is provided. Reflected light can be separated into a skin reflection component and an intralayer reflection component, which are reflected from the surface of the building material 5. Reference point RP1 is a point on the coordinate system that indicates the color when the reflected light is formed solely from the intralayer reflection component.

[0035] The reference point RP1 can be calculated using the spectral distribution of the illuminating fixture 32 (in this case, illuminating fixture 32A) that emits light, or the spectral distribution of the assumed light source, and the spectral diffuse reflectance of the building material 5 that can be measured by the measuring instrument (SCE method: specular reflection removal).

[0036] The skin reflection component can be estimated from the spectrum of the light emitted from the illuminating device 32A that irradiates the surface with light.

[0037] (Measuring distance) Furthermore, the control device 4 calculates the distance L1 of point P1 relative to the reference point RP1. The distance is u * , v * It can be calculated as the distance between the coordinates of two points in a Cartesian coordinate system with the axis (Equation 11 in Figures 5 and 7).

[0038] The control device 4 evaluates the reflected light using the distance L1 of point P1 relative to the reference point RP1.

[0039] If the distance L1 is short, it can be evaluated that the color of the building material 5 is reflected in the reflected light. On the other hand, if the distance L1 is long, the reflected light is distorted in color, and it can be evaluated that the color of the building material 5 is not reflected well. Various calculation formulas and thresholds can be used for evaluation. For example, the control device 4 can evaluate that the reflected light maintains a certain color when the relationship L1 is shorter than the threshold holds true.

[0040] If the measuring instrument 1 can measure the distribution of reflected light in two dimensions, the control device 4 can display the evaluation results as described above as a two-dimensional distribution on the building material 5, as shown in Figure 8. Figure 8 shows an example of a contour plot showing the distribution of reflected light on the building material 5 at a distance L1.

[0041] The control device 4 can display the range of reflected light that is evaluated as not maintaining (or maintaining) a certain color tone by showing the range of reflected light having a distance L1 greater than (or less than) the threshold TH, as shown in Figure 8.

[0042] By viewing the results of the evaluation process, users can understand the color of reflected light or its distribution. This allows them to suitably design the selection of lighting fixtures 32A-32D, the selection of building materials 5, or their arrangement.

[0043] After the evaluation is complete, it is confirmed that measurements have been completed for all lighting fixtures 32A-32D and for all planned measurement locations (settings for distances x1, x2, z1, and z2) (S5).

[0044] If there are remaining measurements scheduled (S5:NO), the control device 4 returns to step S1. The control device 4 changes the target illumination to be placed at irradiation position EP to one of the illumination fixtures 32B-32D, or changes the position of the measuring instrument 1, and then executes the processes from step S2 onwards.

[0045] If it is determined that the measurement is complete (S5:YES), the control device 4 completes the processing related to the evaluation method.

[0046] <Variation> The measurement of reflected light may also be performed by simulation. For example, as shown in Figure 2, it is possible to simulate model M using spectral simulation and measure the distribution of reflected light at point MP. By this method as well, point P1 can be plotted in color space and the same evaluation as described above can be performed.

[0047] Some or all of the above processes may be performed not only by the control device 4 but also by a human. For example, at least part of the evaluation process may also be performed by the user.

[0048] In Equation 11 (Figure 7), u * , v *While we calculated the distance between two points in a two-dimensional color space with the x-axis as the axis, we can also calculate the distance (color difference) between coordinates in a three-dimensional space, as shown in Equation 12. This is also true for other color systems (Equations 24 and 25 in Figure 9, and Equation 37 in Figure 10).

[0049] However, L * u * v * Color system, L * a * b * In color systems, L * Excluding this factor from consideration and calculating the distance in two-dimensional coordinates as shown in equations 11 and 24 is a preferable evaluation method. This is because it makes it possible to evaluate the color of reflected light without being affected by the difference in brightness of reflected light that may occur due to the output difference of the lighting fixtures 32.

[0050] The reference point RP1 may be set by methods other than those described above. For example, the point with coordinates that represents the ideal color in the design can be set as the reference point RP1.

[0051] When measuring distances such as L1, the distance may be measured not only in a Cartesian coordinate system, but also, for example, in a polar coordinate system.

[0052] <Effects> In each of the above embodiments, the following aspects are disclosed.

[0053] (Aspect 1) The evaluation system 10 in the above embodiment and modified example comprises a holding part 2 for holding the building material 5, a plurality of lighting fixtures 32A-32D for irradiating light, a support part 31 for supporting the lighting fixtures 32A-32D and changing the target lighting fixture among the lighting fixtures 32A-32D that irradiates light onto the building material 5, and a measuring instrument 1 for measuring the reflected light reflected from the building material 5.

[0054] In the above configuration, the support unit 31 rotates, allowing for the sequential selection of multiple lighting fixtures 32 as measurement targets, and enabling efficient and easy measurement of reflected light.

[0055] (Aspect 2) In aspect 1, the support portion 31 has side portions 31A-31D that support a plurality of lighting fixtures 32A-32D. The support portion 31 is a rotatable columnar or cylindrical body. The target lighting is changed by rotating the support portion 31.

[0056] In the above configuration, the target illumination can be easily changed by rotating the support part 31, and the reflected light can be measured efficiently.

[0057] (Aspect 3) In aspect 1 or 2, the support portion 31 is formed in the shape of a rectangular prism or rectangular tube, and supports one light fixture each on each of the side portions 31A-31D.

[0058] With the above configuration, the target illumination can be easily changed by rotating the support part 31, and the reflected light can be measured efficiently. In addition, since the support part 31 is formed in the shape of a rectangular prism or rectangular tube, the position of the target illumination relative to the building material 5 can be easily set.

[0059] (Aspect 4) In any of aspects 1 to 3, the evaluation system 10 further comprises a control device 4 that acquires measurement results from the measuring instrument 1, and the control device 4 performs an acquisition process (S3) to acquire the color of reflected light reflected from the surface of the building material 5, a process to convert the color of the reflected light into a point P1 in the color space, a process to measure a distance L1 which is the distance between the coordinates of a preset reference point RP1 and the coordinates of point P1 in the color space, and a process (S4) to evaluate the reflected light based on the distance L1.

[0060] By adopting the above configuration, it becomes possible to appropriately evaluate the light reflected from building materials, etc., and to formulate a suitable lighting plan. [Explanation of symbols]

[0061] Evaluation system 10, measuring instrument 1, holding unit 2, lighting unit 3, control device 4, building materials 5

Claims

1. A holding part for holding building materials, Multiple lights that emit light, Supporting the plurality of lights, and among the plurality of lights, illuminating the building material with light. A support unit that changes the bright target illumination, A measuring device for measuring reflected light, which is light reflected from the aforementioned building material, Equipped with, The support portion is formed in either a rectangular prism shape or a rectangular tube shape and has a plurality of side surfaces. Each of the aforementioned multiple side sections supports one of the aforementioned multiple lights, The target illumination is changed by the rotation of the support portion. system.

2. The device further comprises a control device that acquires measurement results from the aforementioned measuring instrument. The control device is The acquisition process for obtaining the color of the reflected light, The process of converting the color of the reflected light into coordinates in the color space, In the aforementioned color space, the first distance is the distance between a predetermined first coordinate and the aforementioned coordinate. The measurement process, An evaluation process is performed to evaluate the reflected light based on the first distance. The system according to claim 1.

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