JP2014182084A - Illumination evaluation device and illumination evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination evaluation device capable of evaluating the luminous environment based on stress level on eyes.SOLUTION: The illumination evaluation device includes: an illumination condition input section 1 that inputs illumination conditions on an irradiation surface irradiated by a light source; a refractivity input section 2 that inputs the refractivity on eyes of an observer viewing the irradiation surface; a difference value calculation section 31 that calculates a difference value between the refractivity at first point of time and the refractivity at the second point of time which are input by the refractivity input section 2; a storage section 4 that stores the illumination conditions input by the illumination condition input section 1 and a difference value calculated by the difference value calculation section 31 while associating with each other; and an evaluation section 32 that evaluates stress level on the eyes of the observer under the illumination conditions associated with the difference value based on the difference value stored in the storage section 4.

Description

  The present invention relates to an illumination evaluation apparatus and an illumination evaluation method for evaluating illumination light.

  As a technique for inspecting the appearance of an observer, for example, those described in Patent Documents 1 and 2 below are known.

  Patent Document 1 describes a night vision test apparatus that measures a visual acuity recovery time until a target is presented in a dark visual field after the eye is brightly adapted and the target can be recognized. This night vision inspection device has a target brightness varying means for changing the target brightness and a target illumination means for presenting the target with a dim brightness as an initial value of the measurement.

  Patent Document 2 presents a normal visual acuity inspection means for measuring visual acuity when a visual target is presented in a normal brightness space, and a visual adaptation with a dim luminance in a dark visual field after the light is adapted to the test eye. A night vision meter including a night vision measuring means for measuring the time until the target is determined is described. In this night vision meter, the target light source for illuminating the target is composed of white LEDs.

Patent No. 3623401 Japanese Patent No. 3850186

  However, although the techniques described in Patent Documents 1 and 2 evaluate the appearance in the illumination environment based on the performance of visual acuity, the illumination environment cannot be evaluated based on the degree of eye burden.

  In view of the above problems, an object of the present invention is to provide an illumination evaluation apparatus and an illumination evaluation method capable of evaluating an illumination environment from the degree of eye burden.

  In order to achieve the above object, the first aspect of the present invention inputs an illumination condition input unit for inputting an illumination condition on an irradiation surface irradiated by a light source, and a refractive power of an eye of an observer who views the irradiation surface. A difference value calculating unit that calculates a difference value between the refractive power at the first time and the refractive power at the second time, which is input by the refractive power input unit, and the illumination condition input unit. The storage unit that associates and stores the input illumination condition and the difference value calculated by the difference value calculation unit, and the illumination condition associated with the difference value from the difference value stored in the storage unit The gist of the present invention is an illumination evaluation apparatus including an evaluation unit that evaluates the burden on the eyes of the observer.

  Further, in the illumination evaluation device according to the first aspect of the present invention, the evaluation unit is based on an evaluation criterion that the smaller the difference value stored in the storage unit, the less the burden on the observer's eyes. The superiority or inferiority of the illumination condition associated with the difference value can be evaluated.

  The illumination evaluation apparatus according to the first aspect of the present invention further includes an illumination measurement unit that measures an illumination condition on the irradiation surface, and the illumination condition input unit is configured to measure the illumination condition measured by the illumination measurement unit. Can be entered.

  In the illumination evaluation apparatus according to the first aspect of the present invention, the illumination evaluation apparatus further includes a work time input unit for inputting a work time for the observer to view the irradiation surface, and the storage unit is input by the work time input unit. The working time can be stored in association with the difference value.

  The illumination evaluation apparatus according to the first aspect of the present invention further includes an observer input unit for inputting observer information regarding the observer, and the storage unit is an observer input by the observer input unit. Information can be stored in association with the difference value.

  In the illumination evaluation device according to the first aspect of the present invention, the illumination condition may include at least one of illuminance, color temperature, wavelength, illumination range, illuminance gradient, and flicker value on the illumination surface. it can.

  According to a second aspect of the present invention, a step of inputting an illumination condition on an irradiation surface irradiated by a light source, a step of inputting a refractive power of an eye of an observer viewing the irradiation surface, and the input first Calculating a difference value between the refractive power at a time and the refractive power at a second time; storing the input illumination condition and the calculated difference value in association with each other; A gist of the present invention is a lighting evaluation method including a step of evaluating a burden of eyes of the observer in the associated lighting condition from a difference value.

  ADVANTAGE OF THE INVENTION According to this invention, the illumination evaluation apparatus and illumination evaluation method which can evaluate illumination environment from the degree of eye burden can be provided.

It is a block diagram explaining the basic composition of the illumination evaluation apparatus concerning an embodiment of the invention. It is an example which illustrated arrangement | positioning of the light source, irradiation surface, and observer when acquiring the illumination conditions and refractive power used for the illumination evaluation apparatus which concerns on embodiment of this invention. It is an example which illustrated arrangement | positioning of the light source, irradiation surface, and observer when acquiring the illumination conditions and refractive power used for the illumination evaluation apparatus which concerns on embodiment of this invention. It is a schematic diagram explaining an example of the illumination conditions used for the illumination evaluation apparatus which concerns on embodiment of this invention. It is a schematic diagram explaining an example of the illumination conditions used for the illumination evaluation apparatus which concerns on embodiment of this invention. It is a schematic diagram explaining an example of the illumination conditions used for the illumination evaluation apparatus which concerns on embodiment of this invention. It is an example which illustrated the difference value of the refractive power calculated by the illumination evaluation apparatus which concerns on embodiment of this invention. It is a block diagram explaining the basic composition of the illumination evaluation apparatus concerning the 1st modification of an embodiment of the invention. It is a block diagram explaining the basic composition of the illumination evaluation apparatus concerning the 2nd modification of an embodiment of the invention.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals, and redundant description is omitted. However, the embodiment described below exemplifies an apparatus and a method for embodying the technical idea of the present invention, and specifies the configuration of the apparatus and method illustrated in the following embodiment. Not. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

(Lighting evaluation device)
As shown in FIG. 1, the illumination evaluation device according to the embodiment of the present invention includes an illumination condition input unit 1, a refractive power input unit 2, a processing unit 3, and a storage unit 4. For example, as shown in FIG. 2, the illumination evaluation apparatus according to the embodiment of the present invention evaluates the illumination environment of the light source 11 installed above the irradiation surface 12 using the refractive power of the eyes of the observer P. .

  The light source 11 is arbitrarily determined and irradiates light L toward the irradiation surface 12. The light source 11 is a desk light that illuminates a desk, for example. The irradiation surface 12 is an observation target such as a document or a plate disposed on the upper surface of the desk. The observer P sits on a chair and looks at the irradiation surface 12 irradiated by the light source 11 from the viewpoint S in a state where the head is not fixed by a chin rest or the like.

  Alternatively, the irradiation surface 12 may be arranged vertically as shown in FIG. In this case, the light source 11 is installed obliquely above and in front of the irradiation surface 12 and irradiates the light L toward the irradiation surface 12. The observer P stands up and looks at the irradiation surface 12 irradiated by the light source 11 from the viewpoint S in a state where the head is not fixed.

  The illumination condition input unit 1 inputs the illumination condition on the irradiation surface 12 irradiated by the light source 11 to the processing unit 3 according to a user operation, for example. The illumination condition includes at least one of illuminance, color temperature, light wavelength, irradiation range, illuminance gradient, and flicker value (flicker frequency) on the irradiation surface 12. When the light source 11 is a wavelength tunable light source, the illumination condition input to the illumination condition input unit 1 may be set in the light source 11 and light with the set illumination condition may be emitted.

  The refractive power input unit 2 inputs the refractive power of the eyes of the observer P who views the irradiation surface 12 irradiated by the light source 11 to the processing unit 3 according to, for example, a user operation. The refractive power of the eye of the observer P is measured by a refractive power measuring device M such as an autorefractometer. The refractive power input unit 2 may directly input the refractive power as a measurement result as an electric signal from the refractive power measuring device M without depending on the user's operation.

  The observer P measures the refractive power by the refractive power measuring device M at the first time. The refractive power input unit 2 inputs the refractive power at the first time. The observer P looks at the irradiation surface 12 irradiated by the light source 11 for a predetermined work time from the first time. The observer P measures the refractive power by the refractive power measuring device M at the second time after the working time has elapsed from the first time. The refractive power input unit 2 inputs the refractive power at the second time. For example, the irradiation surface 12 can be a newspaper, and the observer P reads the newspaper irradiated by the light source 11 to view the irradiation surface 12 during the work time.

  The processing unit 3 evaluates the illumination environment by the light source 11 from the difference value calculation unit 31 that calculates the difference value between the refractive power at the first time and the refractive power at the second time, and the refractive power of the eyes of the observer P. Part 32. The difference value calculation unit 31 stores the calculated difference value in the storage unit 4 in association with the illumination condition when measuring the refractive power used for the calculation. In addition, the process part 3 can perform the calculation required for the process which the illumination evaluation apparatus which concerns on embodiment of this invention performs, and temporary storage of information.

  The storage unit 4 stores the illumination condition input by the illumination condition input unit 1 and the difference value calculated by the difference value calculation unit 31 in association with each other. In addition, the storage unit 4 stores a series of programs necessary for processing performed by the illumination evaluation apparatus according to the embodiment of the present invention. The storage unit 4 is a display as a logical structure, and may actually be configured from the same hardware or may be configured from separate divided hardware. The storage unit 4 includes, for example, a main storage device including a volatile storage device such as SRAM and DRAM, and an auxiliary storage device including a nonvolatile storage device such as a magnetic disk, an optical disk, a magneto-optical disk, and a semiconductor memory. The

  The evaluation unit 32 evaluates the illumination environment of the light source 11 by evaluating the burden on the eyes of the observer P in the illumination condition associated with the difference value from the difference value stored in the storage unit 4. The evaluation unit 32 evaluates the superiority or inferiority of the illumination condition associated with the difference value based on the evaluation criterion that the burden on the eyes of the observer P is smaller as the difference value stored in the storage unit 4 is smaller. That is, the evaluation criterion of the evaluation unit 32 indicates that the smaller the difference value, the smaller the eye load and the better the illumination environment, and the greater the difference value, the greater the eye load and the inferior illumination environment.

  A human can focus the eye and visually recognize the object by focusing light that has entered the eye from the object on the retina by adjusting the swelling of the crystalline lens. In the lens, the swelling is adjusted by the ciliary muscle, and the refractive power of the eye is adjusted. When a distant object is in focus, the eye is in a state where the ciliary muscle is relaxed and the lens is thinly formed. Even if you keep looking at a distant object, the burden on the eyes is small because the ciliary muscle is relaxed.

  On the other hand, when a nearby object is in focus, the eyes are in a state where the ciliary muscle is tense and the crystalline lens is formed thick. If you keep looking at nearby objects, the ciliary muscles are tense, so the burden on the eyes is large. The ciliary muscles are constantly tense while looking at nearby objects for a long time, such as by reading or operating information equipment. Therefore, even after the work is finished, the tension of the ciliary muscle remains without being relaxed, and the crystalline lens swells, resulting in a state having a high refractive power (pseudomyopia).

  The tension of the ciliary muscle varies depending on the lighting conditions even in the same operation. For this reason, the illumination evaluation apparatus according to the embodiment of the present invention evaluates the burden on the eyes from the difference value between the refractive power at the first time and the refractive power at the second time of the observer P, and the light source 11 The superiority or inferiority of the lighting environment can be evaluated.

-Evaluation example-
An example of a method for evaluating the illumination environment for each of the three types of light sources 11 using the illumination evaluation apparatus according to the embodiment of the present invention will be described. In the following description, newspaper paper arranged on the upper surface of the desk is employed as the irradiation surface 12 as in the example shown in FIG. In addition, three types of lighting environments of only desk lighting A, desk light B, and room lighting without desk light are respectively employed as the light source 11.

  First, the illumination condition input unit 1 inputs the illumination condition on each of the irradiation surfaces 12 irradiated by the three types of light sources 11 to the processing unit 3. The storage unit 4 stores the illumination conditions input to the processing unit 3 for each type of the light source 11. The irradiation condition will be described as the illuminance measured by the illuminometer at a plurality of locations on the irradiation surface 12.

  The illumination conditions when the desk light A is used as the light source 11 are, for example, as shown in FIG. 4, the central portion of the irradiation surface 12 is 1633 lx, the upper end is 891 lx, the lower end is 729 lx, the left end is 596 lx, and the right end Is 550 lx. The desk light A can irradiate a wide range of the irradiation surface 12 relatively uniformly.

  As shown in FIG. 5, for example, the illumination condition when the desk light B is used as the light source 11 is 500 lx at the center of the irradiation surface 12, 232 lx at the upper end, 233 lx at the lower end, 605 lx at the left end, and 605 lx at the right end. Is 192 lx. Further, an intermediate portion between the central portion and the left end portion of the irradiation surface 12 is 2041lx. In contrast to the desk light A, the desk light B irradiates an intermediate portion between the central portion and the left end portion of the irradiation surface 12 brighter than other places, but the illuminance difference is large and the irradiation surface 12 is relatively non-uniform. Irradiate.

  For example, as shown in FIG. 6, the illumination conditions when only room illumination is used as the light source 11 are 201 lx at the center of the irradiation surface 12, 205 lx at the upper end, 196 lx at the lower end, 200 lx at the left end, and 200 lx at the right end. Is 204 lx. In the example shown in FIG. 6, since only the indoor illumination is used as the light source 11, the illuminance on the irradiation surface 12 is generally low.

  Next, the observer P measures the refractive power by the refractive power measuring device M such as an autorefractometer at the first time. The refractive power input unit 2 inputs the refractive power of the eyes of the observer P at the first time to the processing unit 3. The storage unit 4 stores the refractive power at the first time in association with the illumination condition input by the illumination condition input unit 1.

  Next, the observer P reads the newspaper which is the irradiation surface 12 for each predetermined work time (for example, 90 minutes) from the first time under the respective lighting environments of the three types of light sources 11. The observer P measures the refractive power by the refractive power measuring device M at the second time after the working time has elapsed from the first time. The refractive power input unit 2 inputs the refractive power of the eyes of the observer P at the second time. The storage unit 4 stores the refractive power at the second time in association with the lighting condition input by the lighting condition input unit 1 and the refractive power at the first time.

  Note that the predetermined work time can be arbitrarily set as long as the difference value of the refractive power is a time that is calculated by the difference value calculation unit 31 to such an extent that the difference value can be discriminated for each type of the light source 11.

  Next, the difference value calculation unit 31 calculates a difference value between the refractive power at the first time and the refractive power at the second time stored in association with each other by the storage unit 4. The storage unit 4 stores the difference value calculated by the refractive power input unit 2 in association with the illumination condition input by the illumination condition input unit 1.

  For example, as illustrated in FIG. 7, the difference value calculation unit 31 calculates a difference value for each type of the light source 11. In the example shown in FIG. 7, 30 subjects aged 20 to 23 are each a plurality of observers P, and after calculating the difference value of the refractive power in each of the three types of light sources 11 for each observer P, the light source 11 shows the result of calculating the average difference value of the observer P every 11 times.

  The average difference in refractive power of each of the three types of light sources 11 is 0.022D for desk light A, 0.136D for desk light B, and 0.177D for no desk light. It can be seen from FIG. 7 that in the case of desk light A that irradiates the irradiation surface 12 relatively uniformly, the tension of the ciliary muscles is most likely to return, and the burden on the eyes is small. Further, in the case of the desk light B that irradiates the irradiation surface 12 non-uniformly, the tension of the ciliary muscles is less likely to return compared to the desk light A, and the burden on the eyes is large. You can see that it ’s big.

  The evaluation unit 32 evaluates the size of the eye burden on the observer P in the illumination condition associated with the difference value from the difference value stored in the storage unit 4. The evaluation unit 32 evaluates the superiority or inferiority of the illumination condition associated with the difference value based on the fact that the smaller the difference value stored in the storage unit 4 is, the smaller the burden on the eyes of the observer P is. In the example shown in FIG. 7, it can be seen that the lighting environment with the desk light A has the smallest eye load and is superior to the lighting environment with the other light sources 11.

  According to the illumination evaluation apparatus according to the embodiment of the present invention, the illumination environment on the irradiation surface 12 irradiated by the light source 11 is used to change the refractive power of the eye before and after the work of the observer P. It can be evaluated from the degree of eye burden. As a result, for example, when the observer P is questionnaired about “feeling of fatigue”, “readability”, etc., the subjective evaluation can be excluded, and the lighting environment can be evaluated quantitatively based on objective data. it can.

-First modification-
The illumination condition input unit 1 is not limited to the configuration in which the illumination condition is input by a user operation, and the illumination condition may be directly input from various sensors or the like as an electrical signal. Other configurations that are not described in the following modification examples are substantially the same as those in the above-described embodiment, and thus redundant description is omitted.

  As shown in FIG. 8, the illumination evaluation apparatus according to the first modification of the embodiment of the present invention further includes an illumination measurement unit 10 that measures illumination conditions on the irradiation surface 12 irradiated by the light source 11. The illumination measuring unit 10 measures illumination conditions such as illuminance, color temperature, light wavelength, irradiation range, illuminance gradient, and flicker value on the irradiation surface 12 and inputs the illumination conditions to the illumination condition input unit 1. The illumination condition input unit 1 inputs the illumination condition input by the illumination measurement unit 10 to the processing unit 3. The illumination measuring unit 10 includes various measuring instruments and measures illumination conditions at a plurality of locations on the irradiation surface 12.

  According to the illumination evaluation apparatus according to the first modification of the embodiment of the present invention, the illumination condition input unit 1 automatically inputs the measured illumination condition to the processing unit 3, thereby improving the input accuracy of the illumination condition. It is possible to improve and simplify the evaluation.

-Second modification-
As shown in FIG. 9, the illumination evaluation apparatus according to the second modification of the embodiment of the present invention inputs an operation time during which the observer P views the irradiation surface 12 from the first time to the second time. The apparatus further includes a work time input unit 5 and an observer input unit 6 for inputting observer information regarding the observer P. The observer information is, for example, the age, sex, visual acuity, presence / absence of glasses, an identifier, and the like of the observer P.

  The storage unit 4 stores the work time input by the work time input unit 5 and the observer information input by the observer input unit 6 in association with the difference value calculated by the difference value calculation unit 31.

  According to the illumination evaluation apparatus according to the second modification of the embodiment of the present invention, by providing the work time input unit 5, the evaluation results can be arranged for each work time, and the accuracy of the evaluation results is improved. be able to. Moreover, according to the illumination evaluation apparatus which concerns on the 2nd modification of embodiment of this invention, by providing the observer input part 6, an evaluation result can be arranged for every observer information and the precision of an evaluation result Can be improved.

(Other embodiments)
As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the embodiment already described, the illumination evaluation apparatus may consider the power consumption of the light source 11 and the like, and may comprehensively evaluate the illumination environment together with the burden on the eyes of the observer P. The evaluation unit 32 may set a threshold value for the difference value stored in the storage unit 4 and calculate a score for the lighting environment from the magnitude relationship with the threshold value.

  In addition to the above, it goes without saying that the present invention includes various embodiments that are not described herein, such as configurations to which embodiments and modifications of the present invention are applied. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 Illumination condition input part 2 Refractive power input part 3 Processing part 4 Memory | storage part 5 Work time input part 6 Observer input part 10 Illumination measurement part 31 Difference value calculation part 32 Evaluation part

Claims (7)

An illumination condition input unit for inputting an illumination condition on an irradiation surface irradiated by a light source;
A refractive power input unit for inputting the refractive power of the eyes of the observer viewing the irradiated surface;
A difference value calculation unit that calculates a difference value between the refractive power at the first time and the refractive power at the second time, which is input by the refractive power input unit;
A storage unit that associates and stores the illumination condition input by the illumination condition input unit and the difference value calculated by the difference value calculation unit;
An illumination evaluation apparatus comprising: an evaluation unit that evaluates a burden on eyes of the observer in the illumination condition associated with the difference value from the difference value stored in the storage unit.   The evaluation unit evaluates the superiority or inferiority of the illumination condition associated with the difference value based on an evaluation criterion that the smaller the difference value stored in the storage unit is, the less the burden on the observer's eyes is. The illumination evaluation apparatus according to claim 1, wherein It further comprises an illumination measuring unit that measures illumination conditions on the irradiation surface,
The illumination evaluation apparatus according to claim 1, wherein the illumination condition input unit inputs the illumination condition measured by the illumination measurement unit. A work time input unit for inputting a work time for the observer to see the irradiated surface;
The lighting evaluation apparatus according to claim 1, wherein the storage unit stores the work time input by the work time input unit in association with the difference value. An observer input unit for inputting observer information related to the observer;
The illumination evaluation apparatus according to claim 1, wherein the storage unit stores the observer information input by the observer input unit in association with the difference value.   The illumination condition includes at least one of illuminance, color temperature, wavelength, irradiation range, illuminance gradient, and flicker value on the irradiation surface. Lighting evaluation device. Inputting illumination conditions on the illuminated surface illuminated by the light source;
Inputting the refractive power of the eyes of an observer viewing the irradiated surface;
Calculating a difference value between the input refractive power at the first time and the refractive power at the second time;
Storing the input illumination condition and the calculated difference value in association with each other;
Evaluating the burden on the observer's eyes under the associated illumination conditions from the stored difference value.

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