Comfort evaluation system

Abstract

To provide a comfort evaluation system with high evaluation accuracy.SOLUTION: A comfort evaluation system includes: a display device for displaying work task information for a subject to perform a work task; and a processing device for outputting information related to a work concentration degree based on information to be input by the subject who visually recognizes the work task information. The display device displays a video during a period between the work tasks to be performed a plurality of times.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a comfort evaluation system. [Background technology]

[0002] In recent years, visual display terminals (VDT) work has been used in many jobs. There is also a demand to evaluate the comfort of performing VDT work and other such jobs. Here, VDT work refers to work using VDT equipment, such as data input, creating or editing text or images, and programming. VDT equipment is one of the computer output devices, and refers to equipment that displays characters, figures, graphics, videos, etc.

[0003] For example, Patent Document 1 discloses a technique for evaluating the alertness and relaxed state of a worker in a lighting space by performing a Kraepelin test multiple times while changing lighting conditions in the lighting space. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 181664 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the same Kraepelin test is performed multiple times, the influence of familiarity with the test is likely to become significant. Therefore, in the technology of Patent Document 1, the Kraepelin test score increases with each test, and the test accuracy of the Kraepelin test decreases, and the evaluation accuracy of comfort may also decrease.

[0006] An object of the present invention is to provide a comfort evaluation system with high evaluation accuracy. [Means for solving the problem]

[0007] A comfort evaluation system according to one embodiment of the present invention comprises a display device that displays work task information for a subject to perform a work task, and a processing device that outputs information regarding the degree of work concentration based on information input by the subject who visually recognizes the work task information, wherein the display device displays an image during the period between the work tasks which are performed multiple times. Effect of the Invention

[0008] According to the present invention, a comfort evaluation system with high evaluation accuracy can be provided. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing a configuration of a comfort evaluation system according to an embodiment. FIG. [Diagram 2] FIG. 1 is a schematic diagram showing a Kraepelin task displayed on a display device in a DAT test. [Diagram 3] FIG. 1 is a schematic diagram showing a DAT task displayed on a display device in a Kraepelin test. [Figure 4] FIG. 13 is a diagram showing an example of a landscape image displayed during a period between Kraepelin tests in the comfort evaluation system according to the embodiment. [Diagram 5] FIG. 4 is a diagram showing heart rate variability information of a subject obtained by a biosensor. [Figure 6] FIG. 2 is a schematic top view showing a first illumination space which is a first example of an evaluation target. [Figure 7] FIG. 11 is a schematic top view showing a second illumination space which is a second example of an evaluation target. [Figure 8] 4 is a schematic cross-sectional view showing the configuration of a wall lighting device in a second lighting space. FIG. [Figure 9] FIG. 2 is a flow diagram of an evaluation procedure in the comfort evaluation system according to the embodiment. [Figure 10] FIG. 13 is a diagram showing an example of an evaluation result of the number of answers in the first Kraepelin test. [Figure 11]FIG. 13 is a diagram showing an example of an RMSSD evaluation result in the first Kraepelin test. [Figure 12] FIG. 13 is a diagram showing an example of an SDNN evaluation result in the first Kraepelin test. [Figure 13] FIG. 13 is a diagram showing an example of an evaluation result of the number of answers in the second Kraepelin test. [Figure 14] FIG. 13 is a diagram showing an example of an RMSSD evaluation result in the second Kraepelin test. [Figure 15] FIG. 13 shows an example of an SDNN evaluation result in the second Kraepelin test. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same components are given the same reference numerals, and duplicated explanations will be omitted as appropriate.

[0011] The following embodiments are illustrative of a comfort evaluation system for embodying the technical concept of the present invention, and the present invention is not limited to the following embodiments. The dimensions, materials, shapes, and relative positions of the components described below are intended to be illustrative, and are not intended to limit the scope of the present invention, unless otherwise specified. In addition, the sizes and positional relationships of the components shown in the drawings may be exaggerated to clarify the explanation.

[0012] In the following description, terms indicating specific directions or positions (such as "upper", "lower" and other terms including these terms) may be used. These terms are used merely to facilitate understanding of relative directions or positions in the drawings referenced.

[0013] [First embodiment] <Configuration of comfort evaluation system according to the first embodiment> FIG. 1 is a block diagram showing an example of the configuration of a comfort evaluation system 100 according to the first embodiment.

[0014] As shown in FIG. 1, the comfort evaluation system 100 includes a display device 1 that displays task information for a subject to perform a task, and a processing device 2 that outputs information about the task concentration level in the lighting space based on information input by the subject who visually recognizes the task information. In the comfort evaluation system 100, the display device 1 can display an image during a period between task tasks that are performed multiple times. In the example shown in FIG. 1, the comfort evaluation system 100 further includes an audio device 3 that outputs sound, and a biosensor 4 that acquires bioinformation of the subject. The subject is a person who performs various tests, examinations, or inspections used for comfort evaluation. The images displayed by the display device 1 include natural scenery, cityscape scenery, and the like. Note that the comfort evaluation system 100 may further include a display device other than the display device 1, and the display device other than the display device 1 may display an image during a period between task tasks that are performed multiple times.

[0015] In the example shown in Fig. 1, the comfort evaluation system 100 evaluates the comfort in a lighting space. The lighting space is a space in which lighting devices are arranged. There are no limitations on the type, number, position, etc. of the lighting devices arranged in the lighting space.

[0016] For example, the comfort evaluation system 100 outputs information about the task concentration level in a lighting space, based on information input by a subject who visually recognizes task information, in each of a plurality of lighting spaces having different states of reflection of illumination light on the display surface of the display device 1, by the processing device 2. The reflection of illumination light on the display surface of the display device 1 refers to a phenomenon in which illumination light from a lighting device is reflected by the display surface of the display device 1 and enters the field of view of a person viewing the information displayed on the display device 1. The task is, for example, a Kraepelin task.

[0017] The reflection of the illumination light on the display surface of the display device 1 is visually recognized by the subject together with the Kraepelin task information displayed on the display device 1, and this reduces the subject's concentration on the input work. The greater the degree of reflection of the illumination light, the lower the subject's concentration on the work and the lower the comfort of the lighting space. Information on the concentration on the work in the lighting space corresponds to the evaluation result of the comfort of the lighting space. The concentration on the work can also be referred to as work efficiency.

[0018] A liquid crystal display, a plasma display, an organic EL (Electro Luminescence) display, a CRT (Cathode-ray Tube) display, etc. can be used as the display device 1. The display device 1 may display information such as letters, numbers, images, etc. under the control of the processing device 2, or may display information such as numbers or images under the control of a processing device other than the processing device 2.

[0019] The processing device 2 may be a computer such as a PC (Personal Computer). The processing device 2 is capable of various calculations, processing, control, etc. The processing device 2 may include input devices such as a mouse and a keyboard. The subject can input information to the processing device 2 via the input devices. However, the display device 1 and the processing device 2 may be integrated to configure a tablet, a smartphone, a touch panel type PC, etc. In this case, the touch panel corresponds to the display device 1 and also corresponds to the input device of the processing device 2.

[0020] The audio device 3 may be a speaker or the like that generates sound in response to an input signal. In the example shown in Fig. 1, the audio device 3 is connected to the processing device 2 so as to be able to communicate with it via wired or wireless communication. In the comfort evaluation system 100, sound corresponding to the video displayed by the display device 1 can be output during the period between Kraepelin tests that are performed several times. Note that the audio device 3 may output sound under the control of the processing device 2, or may output sound under the control of a processing device other than the processing device 2.

[0021] The biosensor 4 may be, for example, a heart rate sensor (pulse wave sensor) capable of detecting heart rate fluctuations. The biosensor 4 is communicably connected to the processing device 2 via wire or wirelessly. The biosensor 4 is attached to a subject, and outputs bioinformation acquired from the subject undergoing the Kraepelin test to the processing device 2.

[0022] In the comfort evaluation system 100, a subject, while inside a lighting space to be evaluated by the comfort evaluation system 100, visually recognizes Kraepelin task information displayed on the display device 1 and inputs information to the processing device 2 according to the visually recognized Kraepelin task information. In other words, the subject performs a VDT task in the lighting space, inputting information to the processing device 2 according to the Kraepelin task information displayed by the display device 1. At this time, illumination light from a lighting device provided in the lighting space is reflected on the display surface of the display device 1. The state of reflection of the illumination light differs for each of the multiple lighting spaces to be evaluated.

[0023] The comfort evaluation system 100 outputs information on the task concentration level based on information input by a subject who visually recognizes Kraepelin task information in each of a plurality of lighting spaces having different conditions of reflection of illumination light on the display surface of the display device 1. In this way, the comfort evaluation system 100 can evaluate the effect of the reflection of illumination light on the task concentration level.

[0024] In addition, when the same Kraepelin test is administered multiple times, the subject's habituation to the test tends to have a large effect, and the test score tends to increase the more times it is administered. As a result, the more times the Kraepelin test is administered, the lower the accuracy of the Kraepelin test and the lower the accuracy of the evaluation of comfort.

[0025] In the comfort evaluation system 100, during the period between Kraepelin tests that are performed multiple times, an image is displayed on the display device 1 and the subject is allowed to view it, thereby reducing the influence of the subject's habituation in the Kraepelin task, etc. This reduces the decrease in test accuracy that occurs depending on the number of Kraepelin tests, and can increase the comfort evaluation accuracy. In other words, this embodiment can provide a comfort evaluation system 100 with high evaluation accuracy.

[0026] Furthermore, in the comfort evaluation system 100, during the period between Kraepelin tests performed multiple times, the audio device 3 outputs audio corresponding to the video displayed by the display device 1, allowing the subject to view the video and the audio corresponding to the video. This reduces the subject's habituation, boredom, or fatigue with the Kraepelin task, and can improve the accuracy of the comfort evaluation.

[0027] In addition, in the comfort evaluation system 100, by using bio-information acquired by the bio-sensor 4 from the subject undergoing the Kraepelin test, the effect of the reflection of the illumination light on the degree of concentration on work can be evaluated with even higher accuracy.

[0028] Furthermore, in comfort evaluation using biological information, the more the Kraepelin test is performed, the more likely it is to show negative results due to the subject's boredom and fatigue during the test. As a result, the more the Kraepelin test is performed, the lower the accuracy of the Kraepelin test and the lower the accuracy of the comfort evaluation.

[0029] In the comfort evaluation system 100, during the period between Kraepelin tests that are performed multiple times, an image is displayed on the display device 1 and the subject is allowed to view it, thereby reducing the influence of boredom, fatigue, etc., of the subject in the Kraepelin task. This makes it possible to reduce the decrease in test accuracy according to the number of Kraepelin tests in comfort evaluation using biological information, and to increase the comfort evaluation accuracy.

[0030] In the comfort evaluation system 100, the video may be at least one of a landscape video, an animal video, and an animation video. By using these videos, the effects of boredom and fatigue of the subject can be reduced.

[0031] Furthermore, in the comfort evaluation system 100, a Divergent Association Task (DAT) for performing a DAT test in which multiple words with different meanings are selected can be displayed on the display device 1. The information regarding the degree of concentration on work can include an analysis result of the test subject's response to this DAT task. The DAT test is a creativity test in which multiple answer fields for answering nouns are prepared on the screen, and if words (nouns) with different meanings are selected, it is determined that the subject is highly creative.

[0032] 2 is a diagram showing an example of a DAT task in the DAT test, which is displayed on the display device 1. In the DAT test, the comfort evaluation system 100 causes the display device 1 to display, for example, the word "dog."

[0033] When the subject sees the word "dog", he or she inputs a word that is as far removed in meaning from "dog" as possible into the processing device 2 via the input device. The further the meaning, the higher the subject's creativity. High creativity also means a high level of concentration on work. For example, comparing a case where the subject inputs the word "animal" in response to "dog" with a case where the subject inputs the word "pencil", inputting the word "pencil" indicates higher creativity and a higher level of concentration on work.

[0034] The comfort evaluation system 100 uses the processing device 2 to analyze the semantic distance of the words in the subject's answer to the words in the DAT task displayed by the display device 1. This allows the comfort evaluation system 100 to evaluate the effect of the reflection of illumination light on the degree of concentration from the perspective of creativity. Note that the value of the subject's parasympathetic nerve activity measured separately during the DAT test and the results of psychological indicators from a separate questionnaire can also be used in analyzing the level of creativity. The parasympathetic nerve is an autonomic nerve that is predominant when the subject is resting. The parasympathetic nerve is predominant when the subject is relaxed or falling asleep.

[0035] The comfort evaluation system 100 can display various words, not limited to "dog", and analyze the semantic distance of the answer words. There is no particular limit to the display position or number of words on the display device 1, or the number of DAT tasks that the subject is to answer.

[0036] Furthermore, in the comfort evaluation system 100, the information on the degree of concentration on work can include at least one of the number of responses and the rate of incorrect responses by the subject to a plurality of Kraepelin tasks.

[0037] 3 is a diagram showing an example of a Kraepelin task displayed on a display device in a Kraepelin test. In the Kraepelin test, the comfort evaluation system 100 causes the display device 1 to display, for example, two numbers, "4" and "8." These two numbers correspond to the Kraepelin task. A subject who visually recognizes the Kraepelin task adds up the two numbers in the Kraepelin task and inputs the result as an answer to the processing device 2.

[0038] The comfort evaluation system 100 repeatedly displays Kraepelin tasks, each consisting of a pair of two numbers, on the display device 1. The subject repeatedly inputs the subject's answers for each Kraepelin task to the processing device 2. The processing device 2 calculates, for example, the number of answers and the error rate provided by the subject. For example, a larger number of answers means higher workability, and a lower error rate means higher workability.

[0039] The comfort evaluation system 100 can evaluate the effect of the reflection of illumination light on the degree of concentration from the viewpoint of workability by performing a Kraepelin test on the subject. In the Kraepelin test, there are no particular limitations on the display position of the numbers displayed on the display device 1, the number of Kraepelin tasks that the subject is to answer, etc.

[0040] The comfort evaluation system 100 may further perform tests, examinations, or tests other than the DAT test and the Kraepelin test.

[0041] <Video example> Fig. 4 is a diagram showing an example of an image displayed during the period between Kraepelin tests in the comfort evaluation system 100. The image may be an image in which the degree of influence of reflection changes depending on the image color, such as autumn leaves or a sunset containing red, an aurora containing blue, or a forest containing green. In the example shown in Fig. 4, an image of a mountain containing a lot of green is shown.

[0042] The resolution of the image is preferably HD (High Definition) or higher. By using images with a resolution of HD or higher, it is possible to suitably reduce the subject's habituation, boredom, fatigue, etc., to the Kraepelin task. This makes it possible to reduce the decrease in test accuracy according to the number of times the Kraepelin test is performed, and to increase the accuracy of the evaluation of comfort.

[0043] <Example of subject's biological information obtained by a biological sensor> In the comfort evaluation system 100, the biological information may include information on the subject's heart rate variability (heart rate variability information). Alternatively, the biological information may include at least one of information on sympathetic nerve activity and information on parasympathetic nerve activity obtained based on the information on the subject's heart rate variability. By using these biological information, the comfort evaluation system 100 can evaluate with high accuracy the effect of the glare of illumination light on the degree of concentration on work.

[0044] The biosensor 4 can be a My Beat wearable heart rate sensor WHS-1 manufactured by Union Tool Co., Ltd., which is capable of detecting heart rate variability. The comfort evaluation system 100 can calculate RMSSD (Root Mean Square of Successive Differences of RR intervals, in msec), which is one index of parasympathetic nerve activity, by the processing device 2, using the heart rate variability information detected by the biosensor 4. Higher parasympathetic nerve activity means higher concentration on work.

[0045] Here, Fig. 5 is a diagram showing heart rate variability information of a subject obtained by the biosensor 4. The RR interval S1 in Fig. 5 means the interval between peaks of a heart rate waveform. The comfort evaluation system 100 calculates the RR interval S1 from the heart rate variability information obtained by the biosensor 4. The comfort evaluation system 100 can calculate the above-mentioned RMSSD by calculating the square root of the average value of the squares of the differences between consecutive adjacent RR intervals S1, as shown in the following equation (1).

number

[0046] <Examples of lighting spaces to be evaluated> Examples of illumination spaces to be evaluated will be described with reference to Fig. 6 to Fig. 8. Fig. 6 is a schematic top view showing a first illumination space 200a, which is a first example of the evaluation object. Fig. 7 is a schematic top view showing a second illumination space 200b, which is a second example of the evaluation object. Figs. 6 and 7 show the first illumination space 200a and the second illumination space 200b, respectively, as viewed from the direction in which the ceiling is located.

[0047] Each of the first lighting space 200a and the second lighting space 200b is an experimental space, i.e., a room, equipped with lighting devices constructed for comfort evaluation. The first lighting space 200a and the second lighting space 200b have different lighting conditions due to the different types and arrangements of the lighting devices.

[0048] First, the configuration common to the first lighting space 200a and the second lighting space 200b will be described. In Fig. 6 and Fig. 7, the entrance 210 is an entrance for entering the first lighting space 200a or the second lighting space 200b. The entrance 210 is provided with an entrance curtain 10 so that the inside of the lighting space cannot be seen from the outside. The window 220 is a window provided in imitation of a room such as a general office. The window 220 is provided with a window curtain 20.

[0049] A desk 30 is arranged on the opposite side of the entrance 210 in each of the first lighting space 200a and the second lighting space 200b. On the desk 30, the display device 1 and a keyboard 21, which is an input device provided in the processing device 2, are placed. Beside the desk 30, i.e., on the opposite side of the desk 30 from the window 220, the processing device 2 and the audio device 3 are arranged. The processing device 2 and the audio device 3, and the processing device 2 and the keyboard 21 are each connected to be able to communicate with each other by wire or wirelessly. Note that the processing device 2 may be provided with an input device such as a mouse that can communicate with the processing device 2 by wire or wirelessly instead of or in addition to the keyboard 21.

[0050] A chair 40 is placed in front of the desk 30, i.e., on the side of the desk 30 where the entrance 210 is located. When carrying out the DAT test and the Kraepelin test, the subject sits on the chair 40 and can view the display device 1 and input information into the processing device 2 by operating the keyboard 21.

[0051] Furthermore, when the DAT test and the Kraepelin test are performed, the subject wears the biosensor 4. The processing device 2 and the biosensor 4 are connected to each other so as to be able to communicate with each other via wire or wirelessly. The biosensor 4 can output the bioinformation of the subject to the processing device 2 during the period when the DAT test and the Kraepelin test are performed.

[0052] Next, the difference in configuration between the first lighting space 200a and the second lighting space 200b will be described. In Fig. 6, in the first lighting space 200a, a ceiling lighting device 300a is provided on the ceiling. The positional relationship between the ceiling lighting device 300a, the display device 1, and the chair 40 is adjusted so that the illumination light from the ceiling lighting device 300a is reflected on the display surface 11 of the display device 1 and enters the field of view of the subject viewing the display surface 11.

[0053] 6, width W1 is the width of the first illumination space 200a, and depth D1 is the depth of the first illumination space 200a.

[0054] On the other hand, as shown in Fig. 7, the second lighting space 200b is not provided with a ceiling lighting device, but instead has a wall lighting device 300b on the wall opposite the window 220. In Fig. 7, width W2 is the width of the second lighting space 200b, and depth D2 is the depth of the second lighting space 200b.

[0055] Fig. 8 is a schematic cross-sectional view showing an example of the configuration of this wall lighting device 300b. Fig. 8 shows a schematic cross-section of the wall lighting device 300b cut along a plane along the stacking direction of the multiple layers that make up the wall lighting device 300b.

[0056] As shown in Fig. 8, the wall lighting device 300b has a light source 301, a light guide plate 302, and a reflector plate 304. In the example shown in this specification, the shape of the wall lighting device 300b when viewed from the normal direction of the first main surface 3021 is substantially rectangular, but it may be substantially circular, substantially elliptical, substantially polygonal, or the like. The wall lighting device 300b is provided on the wall of the second lighting space 200b so that a second main surface 3022 on the opposite side to the first main surface 3021 of the light guide plate 302 faces the inside of the second lighting space 200b.

[0057] The light source 301 is disposed opposite a side surface 3023 of the light guide plate 302. The side surface 3023 is one of four side surfaces intersecting with the first main surface 3021. However, the light source 301 may be disposed opposite each of two or more side surfaces among the four side surfaces intersecting with the first main surface 3021.

[0058] The light source 301 is, for example, an LED (Light-Emitting Diode) capable of emitting visible light such as white light. The light emitted from the light source 301 passes through the side surface 3023 and enters the inside of the light guide plate 302.

[0059] The light guide plate 302 is a plate-like member including resin, glass, or the like having light transmittance for the light emitted by the light source 301. For example, an acrylic resin can be used as the material for the light guide plate 302. Note that the light transmittance here is preferably 60% or more for the light emitted by the light source 301.

[0060] Light emitted from light source 301 and entering light guide plate 302 through side surface 3023 is guided through light guide plate 302 while being totally reflected by each of first main surface 3021 and second main surface 3022. A part of the light guided through light guide plate 302 passes through either first main surface 3021 or second main surface 3022 located opposite to first main surface 3021, and is extracted from the inside of light guide plate 302 to the outside.

[0061] Of the light extracted from the light guide plate 302, the light passing through the first main surface 3021 is reflected by the reflector plate 304. The light reflected by the reflector plate 304 travels in the direction in which the second main surface 3022 is located, and passes through the light guide plate 302. The light that has passed through the light guide plate 302 passes through the second main surface 3022 and is irradiated into the inside of the second illumination space 200b, becoming illumination light that illuminates the inside of the second illumination space 200b.

[0062] On the other hand, the light that passes through the second main surface 3022 out of the light extracted from the light guide plate 302 is directly irradiated into the inside of the second illumination space 200b, and becomes illumination light that illuminates the inside of the second illumination space 200b.

[0063] The illumination light from the wall lighting device 300b is planar illumination light that is illuminated from the entire second main surface 3022. The positional relationship between the wall lighting device 300b, the display device 1, and the chair 40 is adjusted, similar to the ceiling lighting device 300a, so that the illumination light from the wall lighting device 300b is reflected by the display surface 11 of the display device 1 and enters the field of view of the subject viewing the display surface 11.

[0064] <Example> Hereinafter, examples of the first illumination space 200a and the second illumination space 200b will be described, but the present invention is not limited to these examples.

[0065] (Example of evaluation conditions) The size of the first lighting space 200a shown in Fig. 6 is a width W1 of 2.9m and a depth D1 of 2.2m. The height perpendicular to both the width direction and the depth direction is 2.5m. The size of the second lighting space 200b shown in Fig. 7 is a width W2 of 2.9m and a depth D2 of 2.9m. The height perpendicular to both the width direction and the depth direction is 2.5m.

[0066] The lighting conditions for the first lighting space 200a and the second lighting space 200b were an average color temperature of the top surface of the desk 30 of 4500K±10% and an average illuminance of 350Lx±5%. Table 1 shows a list of the main conditions for the first lighting space 200a and the second lighting space 200b. [Table 1]

[0067] The wall lighting device 300b placed in the second lighting space 200b had a light-emitting area with a width of 600 mm and a light-emitting area with a height of 1190 mm, i.e., a length in a direction substantially perpendicular to the width. The wall lighting device 300b was placed at a height of 1000 mm from the floor.

[0068] The subjects were 20 healthy adult males (average age 39.9±9.5 years). The order of entry into the first lighting space 200a or the second lighting space 200b was randomized. In addition, taking into consideration the subjects' fatigue, familiarity with the test, circadian rhythm, etc., the comfort of either the first lighting space 200a or the second lighting space 200b was evaluated, and then the comfort of the other of the first lighting space 200a or the second lighting space 200b was evaluated at the same time about three weeks later. The circadian rhythm refers to the rhythm of basic bodily functions such as body temperature and hormone secretion in humans, which has a cycle of about 24 hours.

[0069] <Example of evaluation procedure in comfort evaluation system 100> Fig. 9 is a flowchart showing an example of a procedure for evaluating comfort of a lighting space in the comfort evaluation system 100. In the comfort evaluation in the comfort evaluation system 100, the procedure in Fig. 9 starts when a subject enters the lighting space (room) to be evaluated, which is a starting condition.

[0070] First, in step S11, the subject who has entered the first lighting space 200a or the second lighting space 200b sits on the chair 40 and rests in this position. After that, the subject continues to sit on the chair 40. During this resting period, the state of the subject's autonomic nerves changes from a dark-adapted state to a light-adapted state.

[0071] Next, in step S12, the subject grasps the indoor environment of the first illumination space 200a or the second illumination space 200b. The subject can grasp the environment such as the arrangement of the display device 1 and the processing device 2.

[0072] Next, in step S13, the subject performs the DAT test. Specifically, the subject answers the DAT task by inputting information into the processing device 2 via the keyboard 21 while visually checking the information displayed on the display device 1.

[0073] For example, the comfort evaluation system 100 allows the subject to answer up to 15 nouns (excluding proper nouns and technical terms) starting from a row (e.g., the A, S, N, M rows) indicated on the display surface 11 of the display device 1, with the meanings of the nouns becoming increasingly distant from each other, in eight minutes. The DAT test ends when eight minutes have elapsed after the start of the DAT test.

[0074] Next, in step S14, the subject continues to sit in the chair 40 and performs the Kraepelin test. Specifically, the subject answers the Kraepelin test by inputting information into the processing device 2 via the keyboard 21 while visually checking the information displayed on the display device 1. For example, the display device 1 displays two one-digit numbers on the display surface 11. After visually checking these, the subject performs the Kraepelin test for eight minutes, inputting the last digit of the sum of the two numbers via the keyboard 21. The Kraepelin test ends when eight minutes have elapsed since the start of the Kraepelin test.

[0075] Next, in step S15, the comfort evaluation system 100 displays an image on the display device 1 for 10 minutes, and outputs a sound corresponding to the image from the audio device 3. Even after the DAT test is completed, the subject continues to view the image and sound displayed on the display device 1 while remaining seated in the chair 40.

[0076] Next, in step S16, the subject performs the DAT test in the same manner as in step S13. The DAT test ends when 8 minutes have elapsed since the start of the Kraepelin test.

[0077] Next, in step S17, the subject performs the Kraepelin test as in step S14 while still seated in the chair 40. The Kraepelin test ends when 8 minutes have elapsed since the start of the Kraepelin test.

[0078] Next, in step S18, the subject leaves the first lighting space 200a or the second lighting space 200b.

[0079] Next, in step S19, the subject answers a questionnaire about whether they were able to concentrate, whether they felt calm, whether they felt noise (reflection) on the display surface 11, etc. In the comfort evaluation system 100, if the questionnaire results show that the subjects were able to concentrate, felt calm, and did not feel noise (reflection) on the display screen, it can be determined that the comfort of the lighting space is high in terms of psychological indices.

[0080] In the above manner, the comfort evaluation system 100 can be used to evaluate the comfort of a lighting space.

[0081] (Example of evaluation results) 10 is a diagram showing an example of the evaluation result of the number of answers in the first Kraepelin test. It shows information 400a related to the task concentration level output by the processing device 2. A graph 101 shown with dot hatching is the result in the first lighting space 200a. A graph 102 shown with oblique hatching is the result in the second lighting space 200b.

[0082] Fig. 11 is a diagram showing an example of an RMSSD evaluation result in the first Kraepelin test. Fig. 11 shows information 400b on the task concentration level output by the processing device 2. A graph 111 shown with dot hatching is the result in the first lighting space 200a. A graph 112 shown with oblique hatching is the result in the second lighting space 200b.

[0083] Fig. 12 is a diagram showing an example of an SDNN evaluation result in the first Kraepelin test. Fig. 12 shows information 400c on the task concentration level output by the processing device 2. A graph 121 shown with dot hatching is the result in the first illumination space 200a. A graph 122 shown with oblique hatching is the result in the second illumination space 200b.

[0084] 13 is a diagram showing an example of the evaluation result of the number of answers in the second Kraepelin test. It shows information 400d on the task concentration level output by the processing device 2. A graph 131 shown with dot hatching is the result in the first lighting space 200a. A graph 132 shown with oblique hatching is the result in the second lighting space 200b.

[0085] Fig. 14 is a diagram showing an example of an RMSSD evaluation result in the second Kraepelin test. Fig. 14 shows information 400e on the task concentration level output by the processing device 2. A graph 141 shown with dot hatching is the result in the first lighting space 200a. A graph 142 shown with oblique hatching is the result in the second lighting space 200b.

[0086] Fig. 15 is a diagram showing an example of an SDNN evaluation result in the second Kraepelin test. Fig. 15 shows information 400f on the task concentration level output by the processing device 2. A graph 151 shown with dot hatching is the result in the first illumination space 200a. A graph 152 shown with oblique hatching is the result in the second illumination space 200b.

[0087] As shown in Figs. 10 to 12, in the first Kraepelin test, the number of answers indicating workability and the RMSSD and SDNN of the heart rate reflecting the activity of the parasympathetic nervous system showed the same tendency.

[0088] In addition, in the first Kraepelin test, the number of responses in the second lighting space 200b was greater than the number of responses in the first lighting space 200a. This indicates that the second lighting space 200b is more comfortable than the first lighting space 200a in terms of workability.

[0089] Furthermore, in the first Kraepelin test, the heart rate evaluation results in the second lighting space 200b showed a higher level of alertness than the heart rate evaluation results in the first lighting space 200a. This shows that, from the viewpoint of creativity, the comfort of the second lighting space 200b is higher than that of the first lighting space 200a.

[0090] In the evaluation results of the number of responses, the analysis by t-test reached a significance level of 5% or less (p<0.05), with the number of responses being significantly greater in the second lighting space 200b. In the evaluation of the RMSSD and SDNN of the heart rate, it was found that the second lighting space 200b was more awake, i.e., in a state of concentration. In the analysis by t-test of the RMSSD and SDNN evaluation, the significance level was 10% or less (p<0.1) in both the first lighting space 200a and the second lighting space 200b.

[0091] As shown in FIGS. 13 to 15, the trends in the number of responses and the RMSSD and SDNN of the heart rate in the second Kraepelin test were almost the same as those in the first Kraepelin test.

[0092] That is, in the second Kraepelin test, the number of responses in the second lighting space 200b was greater than the number of responses in the first lighting space 200a. This indicates that, in terms of workability, the comfort of the second lighting space 200b is higher than that of the first lighting space 200a.

[0093] Furthermore, in the second Kraepelin test, the heart rate evaluation results in the second lighting space 200b showed a higher level of alertness than the heart rate evaluation results in the first lighting space 200a. This shows that, from the viewpoint of creativity, the comfort of the second lighting space 200b is higher than that of the first lighting space 200a.

[0094] In the evaluation results of the number of responses, the analysis by t-test showed a significance level of 10% or less (p<0.1), with the number of responses being significantly greater in the second lighting space 200b. In the RMSSD and SDNN evaluations of heart rate, it was found that the second lighting space 200b was more awake, i.e., in a state of concentration. In the RMSSD and SDNN evaluations, the analysis by t-test showed a significance level of 10% or less (p<0.1) for RMSSD and a significance level of 5% or less (p<0.05) for SDNN in both the first lighting space 200a and the second lighting space 200b.

[0095] From the results shown in Fig. 10 to Fig. 15, it was found that the comfort evaluation system 100 can evaluate the influence of the reflection of the illumination light on the degree of concentration on work. It was also found that the comfort evaluation system 100 can evaluate the influence of the reflection of the illumination light on the degree of concentration on work, based on the biological information of the subject obtained by the biological sensor 4. It was found that in the second illumination space 200b, from the viewpoint of workability, the influence of the reflection of the illumination light on the degree of concentration on work is smaller than that in the first illumination space 200a.

[0096] By combining the evaluation results of the number of responses with the results of parasympathetic nervous activity such as the RMSSD of heart rate and SDNN, it is possible to evaluate with high accuracy the impact of glare from lighting on the level of concentration at work.

[0097] In addition, if the subject becomes accustomed to, bored with, or tired of the Kraepelin task in the two Kraepelin tests, the accuracy of the evaluation of comfort in the second Kraepelin test may decrease, and the difference in the evaluation results between the first and second Kraepelin tests may become large. In contrast, the results of Figs. 10 to 15 show that the number of answers and the trends of RMSSD and SDNN of heart rate are almost the same between the first and second Kraepelin tests. From this, it was found that the subject's accustomedness to, bored with, or tiredness of the Kraepelin task can be reduced by displaying an image on the display device 1 and having the subject view it during the period between the two Kraepelin tests.

[0098] Although the preferred embodiment has been described above in detail, the present invention is not limited to the above-described embodiment, and various modifications and substitutions can be made to the above-described embodiment without departing from the scope of the claims. For example, the biological information may be information based on pulse waves, brain waves, and facial expressions.

[0099] The ordinal numbers, quantities, and other numbers used in the description of the embodiments are all provided as examples to specifically explain the technology of the present invention, and the present invention is not limited to the exemplified numbers. Furthermore, the connection relationships between the components are provided as examples to specifically explain the technology of the present invention, and do not limit the connection relationships that realize the functions of the present invention.

[0100] The comfort evaluation system 100 according to the embodiment can evaluate the influence on the degree of task concentration, and therefore can evaluate the comfort of an illumination space or the like according to the configuration and arrangement of the illumination device. Furthermore, the evaluation results by the comfort evaluation system 100 can be suitably used for designing illumination devices, illumination spaces, and the like. Note that the comfort evaluation system 100 can evaluate the comfort of various environments and spaces, not limited to illumination spaces.

[0101] For example, aspects of the present invention are as follows. <1> The comfort evaluation system includes a display device that displays work task information for a subject to perform a work task, and a processing device that outputs information regarding the degree of work concentration based on information input by the subject who visually recognizes the work task information, wherein the display device displays an image during the period between each of the work tasks which are performed multiple times. <2> The present invention further includes an audio device that outputs audio, and the audio device outputs audio corresponding to the image displayed by the display device during a period between the task being performed multiple times. <1> 2 is a comfort evaluation system according to the present invention. <3> The resolution of the image is HD standard or higher; <1> or the above <2> 2 is a comfort evaluation system according to the present invention. <4> The image is at least one of a landscape image, an animal image, and an animation image. <1> From the above <3> 1 is a comfort evaluation system according to any one of the above. <5> The method further includes a biosensor that acquires bioinformation of the subject, and the information regarding the task concentration level includes the bioinformation acquired by the biosensor from the subject performing the task. <1> From the above <4> 1 is a comfort evaluation system according to any one of the above. <6> The biological information includes information regarding heart rate variability of the subject. <5> 2 is a comfort evaluation system according to the present invention. <7> The biological information includes at least one of information on sympathetic nerve activity and information on parasympathetic nerve activity obtained based on information on heart rate variability of the subject. <5> or the above <6> 2 is a comfort evaluation system according to the present invention. [Explanation of symbols]

[0102] 1 Display device 11 Display surface 2 Processing equipment 21 Keyboard 3 Sound equipment 4. Biometric sensors 10 Entrance Curtain 20 Window Curtains 30 desks 40 Chair 101, 102, 111, 112, 121, 122, 131, 132, 141, 142, 151, 152 Graphs 100 Comfort Rating System 200a First Lighting Space 200b 2nd lighting space 210 Entrance 220 Window 300a Ceiling lighting device 300b wall lighting device 301 Light source 3021 First main surface 3022 Second main surface 3023 Side 302 Light guide plate 304 Reflector 400a~400f Information on work concentration W1, W2 width D1, D2 depth S1 R-R interval

Claims

1. a display device that displays task information for a subject to perform a task; a processing device that outputs information regarding a task concentration level based on information input by a subject who visually recognizes the task information; The display device displays an image during a period between the work tasks being performed multiple times.

2. Further comprising an audio device for outputting audio, The comfort evaluation system according to claim 1 , wherein the audio device outputs a sound corresponding to the image displayed by the display device during a period between the task being performed multiple times.

3. The comfort evaluation system according to claim 1 or 2, wherein a resolution of the video is equal to or higher than an HD standard.

4. 3. The comfort evaluation system according to claim 1, wherein the image is at least one of a landscape image, an animal image, and an animation image.

5. The apparatus further includes a biosensor for acquiring bioinformation of the subject, The comfort evaluation system according to claim 1 , wherein the information relating to the degree of concentration on a task includes bio-information acquired by the bio-sensor from the subject performing the task.

6. The comfort evaluation system according to claim 5 , wherein the biological information includes information regarding heart rate variability of the subject.

7. The comfort evaluation system according to claim 5 , wherein the biological information includes at least one of information regarding sympathetic nerve activity and information regarding parasympathetic nerve activity obtained based on information regarding heart rate variability of the subject.

Images