JP5515989B2 - Residual luminance measuring device and residual luminance measuring system - Google Patents

Description

  The present invention relates to a residual luminance measuring apparatus and a residual luminance measuring system for measuring residual luminance, and in particular, in an emergency, when a light is lost, a phosphorescent sign that induces people to evacuate is actually lost. The present invention relates to a residual luminance measuring apparatus and a residual luminance measuring system suitable for confirming that the luminance necessary for guidance is maintained for a predetermined time.

  A phosphorescent sign using a phosphorescent (phosphorescent) material has a feature that, in the event of a power failure in an emergency, it can maintain phosphorescence (emission) for a certain period of time while being attenuated, and induce evacuation. Due to such characteristics, a large number (for example, 100 or more) of phosphorescent signs are installed on the floors or walls of transportation stations such as subways, buildings, and public facilities.

  For example, as shown in FIG. 11, such a phosphorescent marker 100 includes a light emitting area 101 containing a phosphorescent material and a non-light emitting area 102 which shows at least a predetermined symbol and does not contain a phosphorescent material. When the external light is blocked, the phosphorescent marker 100 maintains the light emission area 101 for a certain period of time due to the phosphorescence accumulated in the phosphorescent material, while the non-light emission area 102 does not emit light. The symbol is specified.

  Such light emission by the phosphorescent marker 100 is attenuated with the passage of time when the illumination is actually lost, and the predetermined symbol is not visually recognized. Furthermore, the phosphorescent capacity of the phosphorescent material decreases with age. Therefore, in order to ensure safety in an emergency, it is periodically determined that when the illumination is actually lost, the phosphorescent sign 100 maintains a predetermined emission luminance after a predetermined time (for example, 20 minutes) has elapsed. Need to be checked. However, it is not practical to actually turn off the illumination in the facility and actually measure and confirm the brightness of phosphorescence after a predetermined time has elapsed. And it is not practical to measure the luminance by shielding the phosphorescent sign 100 from outside light instead of turning off the illumination at the facility because each of the 100 or more phosphorescent signs 100 requires 20 minutes.

As means for solving such an inconvenience, for example, Patent Document 1 and Patent Document 2 disclose a method of estimating the luminance after 20 minutes from the initial change in luminance, for example, 3 minutes. . FIG. 12 is a graph showing decay characteristics of afterglow luminance of a typical phosphorescent material. The horizontal axis in FIG. 12 indicates time (minute; Min.), And the vertical axis indicates the change in luminance (Cd / m ² ) in logarithm. The method disclosed in Patent Literature 1 and Patent Literature 2 is a function approximation of the luminance attenuation characteristic illustrated in FIG. 12, and the luminance after 20 minutes is estimated from the luminance change for 3 minutes using the approximation function. This greatly reduces the measurement time.

JP 2007-170944 A JP 2007-183233 A

  According to the methods disclosed in Patent Document 1 and Patent Document 2, the accuracy of the estimated luminance depends on the validity of the approximate function or the theoretical damping characteristic. However, as shown in FIG. 12, the luminance attenuation of the phosphorescent material deviates from a straight line, and it is difficult to obtain an appropriate approximate function. Furthermore, since the deviation differs depending on the phosphorescent material, it is difficult to provide a general theoretical attenuation characteristic including a new phosphorescent material to be added in the future. For this reason, compared with the method of actually measuring the luminance 20 minutes after the light shielding, the methods described in Patent Document 1 and Patent Document 2 are less accurate and reliable.

  Further, in the methods described in Patent Document 1 and Patent Document 2, the measurement error due to the luminance transition for 3 minutes is greatly enlarged by the estimation error 20 minutes after light shielding, so the luminance transition for 3 minutes is measured with high accuracy. It is necessary to. For this reason, it is necessary to stably shield the phosphorescent marker 100 and keep the positional relationship between the phosphorescent marker 100 and the measuring device constant. However, even for 3 minutes, it is difficult to stably block the phosphorescent signs 100 attached at various positions on the floor and the wall and stably hold the measuring device. In particular, the measuring device is a luminance meter. If the optical system for functioning as an optical system has a considerable weight and size, it imposes a heavy burden on the operator of the measuring apparatus.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a residual luminance measuring apparatus and a residual luminance measuring system with a small burden on the operator.

  As a result of various studies, the present inventor has found that the above object is achieved by the present invention described below. That is, the residual luminance measuring apparatus according to one aspect of the present invention is a residual luminance measuring apparatus that measures the residual luminance of the measurement area in the light-shielded luminous sign, and receives the radiated light from the measurement area in the luminous sign. A light-receiving unit, a control unit that controls the light-receiving unit, and measures the measured light measured by the light-receiving unit, which is measured by the light-receiving unit from the measurement area until a predetermined time elapses. A storage unit, and a housing for housing the light receiving unit, the control unit, and the storage unit, wherein the light receiving unit is opposed to a measurement area in the phosphorescent sign, and the measurement area is shielded from ambient light. As described above, it has a fixing portion for mounting a fixing means for detachably fixing to the phosphorescent sign.

  According to the above configuration, since the fixing portion is provided, the residual luminance after a predetermined time can be measured without bothering the operator after fixing the residual luminance measuring device.

  Further, in another aspect, in the above-described residual luminance measuring device, the control unit measures a change rate of received light amount from a measurement start to a predetermined time based on a measurement value measured by the light receiving unit, The residual luminance of the measurement area after a predetermined time from the start of measurement is obtained from the rate of change in received light amount and the initial luminance of the measurement area measured in advance.

  According to this configuration, the residual luminance measuring device is required only for the relative measurement accuracy of the received light amount from the measurement start to the predetermined time. For this reason, the residual luminance measuring device does not need the configuration required for measuring the luminance from the start of measurement until a predetermined time, and therefore the residual luminance measuring device can be configured to be small and light. The device can be easily fixed to the phosphorescent sign for a predetermined time. Further, according to this configuration, since it can be configured at a low cost, even if a large number of residual luminance measuring devices are used for efficient measurement, there is no significant increase in burden.

  According to another aspect, in the above-described residual luminance measuring apparatus, the light receiving unit includes a silicon photodiode (SPD), and the light receiving side of the silicon photodiode has a relative spectral sensitivity of the silicon photodiode. It has no optical element for modification.

  According to this configuration, the light receiving unit does not need to include a filter that directly receives light and approximates the relative spectral sensitivity to the spectral luminous efficiency, and can be configured at a lower cost. Therefore, even if a large number of residual luminance measuring devices are used, there is no significant increase in cost. In addition, according to this configuration, since the SPD does not need to include the optical element, the use efficiency of the light beam is high, and high sensitivity and high accuracy can be achieved.

  Further, in another aspect, in the above-described residual luminance measuring device, the light receiving unit includes a silicon photodiode (SPD), and the storage unit has a spectral luminous efficiency with respect to radiated light from the measurement region. A relationship with the spectral sensitivity of the silicon photodiode is stored in advance, and the control unit converts the measured value into a value (luminance) with spectral luminous efficiency based on the relationship.

  According to this configuration, the light receiving unit does not need to include a filter for approximating the radiated light from the measurement area to the spectral luminous efficiency, and can be configured at a lower cost. Even if individual residual luminance measuring devices are used, there is no significant increase in cost. Further, according to this configuration, since it is not necessary to provide a filter, the light beam utilization efficiency is high, and high sensitivity and therefore high accuracy can be achieved.

  According to another aspect, in the above-described residual luminance measuring apparatus, the light receiving unit further includes a filter that reduces the wavelength dependence of spectral sensitivity, and radiates from the measurement area of the phosphorescent sign via the filter. It is characterized by receiving light.

  According to this configuration, since the light receiving unit receives the radiated light through the filter that reduces the wavelength dependence of spectral sensitivity, the spectral distribution of the radiated light in the phosphorescent label may slightly change during attenuation. However, it is less affected and is highly accurate.

  According to another aspect, in the above-described residual luminance measuring apparatus, the fixing portion is a region for mounting an adhesive tape as the fixing means.

  According to this configuration, since the fixing for a predetermined time is performed by the adhesive tape, the fixing and removing of the residual luminance measuring device for the predetermined time can be performed at low cost and efficiently.

  According to another aspect, in the above-described residual luminance measuring device, the fixing portion is an area for mounting a suction cup as the fixing means, and further includes a suction cup mounted on the fixing portion. Features.

  According to this configuration, since the suction cups are provided, the detachability is improved and the burden on the operator is further reduced.

  According to another aspect, in the above-described residual luminance measuring device, the housing has a measurement unit that houses the light receiving unit, the control unit, and the storage unit, and an attachment unit for attaching the measurement unit. A light-shielding unit, wherein the light-shielding unit can visually recognize the measurement area when the measurement unit is not attached to the attachment part, and the light-receiving part when the measurement unit is attached to the attachment part. Is opposed to the measurement area.

  According to this configuration, the housing includes the measurement unit that houses the measurement unit, the control unit, and the storage unit, and the light-shielding unit that has the attachment unit for attaching the measurement unit. When the measurement unit is not attached to the attachment part, the measurement area is visible, and when the measurement unit is attached to the attachment part, the light receiving part faces the measurement area. The residual luminance measuring device can be fixed for a predetermined time with the light receiving portion facing the measurement area while visually confirming.

  A residual luminance measurement system according to another aspect of the present invention is a residual luminance measurement system that measures each residual luminance in a plurality of phosphorescent signs, and can be detachably fixed to the plurality of phosphorescent signs. A plurality of measurement units for measuring a luminance change rate after a predetermined time, an initial luminance measurement unit for measuring each initial luminance in the plurality of phosphorescent signs before the measurement is started in the plurality of measurement units, and the plurality of the plurality of measurement units. A processing unit for obtaining each residual luminance after a predetermined time in the plurality of phosphorescent signs based on each luminance change rate measured by each of the measurement units and each initial luminance measured by the initial luminance measurement unit; Each of the plurality of measurement units is any one of the above-described residual luminance measurement devices.

In the residual luminance measuring system having such a configuration, after measuring the initial luminance with the initial luminance measuring unit for a plurality of phosphorescent signs, the measuring unit is fixed to each phosphorescent sign, and each after a predetermined time in the plural phosphorescent signs Since the residual luminance is measured in parallel (simultaneously), the substantial measurement time per phosphorescent label is short, and the efficiency with respect to all of the plurality of phosphorescent labels is high. Further, since the measurement unit is required only for the accuracy of relative measurement in the amount of received light from the start of measurement to a predetermined time later, the measurement unit can be configured in a small size, light weight and low cost. Because of this small size and light weight, it can be easily and efficiently fixed to phosphorescent signs at various arrangement positions, and it is a low-cost and relatively high-cost initial luminance measuring unit. For the sake of efficiency, even if a large number of such measurement units are prepared and used for efficiency, there is no significant increase in burden.
A residual luminance measuring apparatus according to still another aspect of the present invention is a residual luminance measuring apparatus that measures the residual luminance of a measurement area in a light-shielded luminous sign, and that previously stores an initial luminance value of the measurement area in the luminous sign. A reference measurement unit to be acquired, a light receiving unit that receives radiated light from a measurement region in the phosphorescent sign, and a light receiving unit that controls the light receiving unit to receive the radiated light from the measurement region from the start of measurement until a predetermined time has elapsed A control unit for measuring by the light receiving unit, a storage unit for storing the measurement value measured by the light receiving unit, the light receiving unit, the control unit, and the storage unit, and the light receiving unit in the measurement area of the phosphorescent sign A housing that opposes and shields the measurement area from ambient light, and the control unit is configured to change a received light amount from the measurement start to the predetermined time based on a measurement value measured by the light receiving unit. And calculate From said initial brightness value obtained before the constant starting and the light receiving amount change rate, and obtains the remaining luminance of the measurement zone after the predetermined time.
A residual luminance measurement system according to yet another aspect of the present invention is a residual luminance measurement system that measures each residual luminance in a plurality of phosphorescent signs, and a plurality of light shielding units that respectively shield the measurement areas of the plurality of phosphorescent signs. A plurality of phosphorescent signs that start measuring the amount of received light from the measurement area in a state where the measurement area is shielded by the unit and the light shielding unit, and stop measuring after a predetermined time from the start of measurement. A plurality of measurement units to be executed for each of the plurality of measurement units, an initial luminance measurement unit for measuring each of the initial luminances of the plurality of phosphorescent signs before the measurement is started by the plurality of measurement units, and the plurality of measurement units, respectively. Based on the measured value of the amount of received light, the rate of change in the amount of received light from the start of measurement to the predetermined time later is determined for each of the plurality of phosphorescent signs. A processing unit for calculating each residual luminance after the predetermined time in the plurality of phosphorescent signs based on each received light amount change rate and each initial luminance measured by the initial luminance measuring unit; It is characterized by comprising.

  The residual luminance measuring apparatus according to the present invention can reduce the burden on the operator.

It is a conceptual diagram for demonstrating the residual-luminance measuring apparatus concerning embodiment of this invention. It is a front view which shows the external appearance of the measurement unit and light-shielding unit concerning embodiment of this invention. It is sectional drawing of the measurement unit and light-shielding unit concerning embodiment of this invention. It is a block diagram which shows the electric constitution of the measurement unit concerning embodiment of this invention. It is a graph which shows the relative spectral distribution at the time of attenuation | damping of two typical phosphorescent material radiation light. It is a graph which shows the spectral sensitivity of SPD concerning an embodiment of the invention, and the spectral transmittance of a filter for amendment. It is a block diagram of the reference | standard measurement unit concerning embodiment of this invention. It is a block diagram which shows the electric constitution of the processing unit concerning embodiment of this invention. It is a graph which shows the relative spectral distribution and relative spectral luminous efficiency of typical luminous material radiation light. It is sectional drawing of the measurement unit and light-shielding unit concerning other embodiment of this invention. It is a block diagram of a luminous sign. It is a graph showing the decay characteristic of the afterglow brightness | luminance of typical phosphorescent material.

  Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. Further, in this specification, when referring generically, it is indicated by a reference symbol without a suffix, and when referring to an individual configuration, it is indicated by a reference symbol with a suffix.

  FIG. 1 is a conceptual diagram for explaining a residual luminance measuring apparatus according to an embodiment of the present invention. The residual luminance measuring device S according to the present embodiment is a measuring device that measures the residual luminance of the measurement area in the light-shielded luminous sign 100. For example, as shown in FIG. The light shielding unit 1 attached to the phosphorescent sign 100 with an adhesive tape 30 (an example of fixing means) so as to face the area (light emitting area 101), and the rate of change from the initial measurement of the luminance of the phosphorescent sign attached to the light shielding unit 1 Measuring unit 20, one processing unit 50 that reads a measurement value by the measuring unit 20, and one reference measurement unit 40 that is connected to the processing unit 50 and measures the initial luminance of the phosphorescent sign 100. Configured. The processing unit 50 is used in common for the plurality of measurement units 20.

The main characteristics of the residual luminance measuring apparatus S according to the present embodiment are the following three points.
(1) Since the method of predicting the residual luminance after a predetermined time from the attenuation characteristic at the initial stage of shading is not reliable, the residual luminance measuring apparatus S according to the present embodiment measures the residual luminance after the predetermined time from the start of measurement. Take the method. However, it is possible to shorten the measurement time per one phosphorescent marker 100 by measuring a plurality of luminous markers 100 in parallel using a plurality of pairs of the light shielding units 1 and the measuring units 20. . For example, when the residual luminance after 20 minutes of 100 luminous markers 100-N (N is an integer equal to or less than 100) is measured almost simultaneously in parallel by ten, the substantial measurement per luminous marker 100 The time is about 2 minutes.
(2) In the residual luminance measuring apparatus S according to the present embodiment, the residual luminance is obtained from the luminance at the initial shade and the change rate from the initial shade. That is, the initial luminance of the phosphorescent marker 100 is sequentially measured by one reference measurement unit 40 calibrated as a luminance meter having a spectral sensitivity that approximates the relative spectral luminous efficiency Vλ. Then, the change rate measurement from the initial stage of light shielding that requires a predetermined time is performed in parallel with the plurality of measurement units 20 while shielding the measurement area. The light receiving sections of the plurality of measurement units 20 that measure the rate of change have a spectral sensitivity that approximates the relative spectral luminous efficiency Vλ because the spectral distribution of the emitted light from the measurement area of the phosphorescent marker 100 hardly changes when attenuated. It is not necessary to have an optical system as a luminance meter nor calibration, so that it can be realized with light weight, small size and low cost.
(3) Since the light-shielding unit 1 to which the measurement unit 20 is attached is flat, lightweight, and small, it can be easily attached to individual phosphorescent signs 100 installed at various positions on the floor and walls with adhesive tape and removed. it can. After installation, it is allowed to stand until a predetermined time elapses so that the light can be stably shielded and measured, so the burden on the operator is small.

  Hereinafter, the configuration of the residual luminance measuring device S will be described in detail. FIG. 2 is a front view showing the appearance of the measurement unit and the light shielding unit according to the embodiment of the present invention. FIG. 2A shows a case where the measurement unit is in the retracted position, and FIG. 2B shows a case where the measurement unit is in the measurement position. FIG. 3 is a cross-sectional view of the measurement unit and the light shielding unit according to the embodiment of the present invention. 3A is a cross-sectional view taken along the line II of FIG. 2B, and FIG. 3B is a cross-sectional view taken along the line II-II of FIG. 2B. FIG. 4 is a block diagram showing an electrical configuration of the measurement unit according to the embodiment of the present invention. FIG. 5 is a graph showing a relative spectral distribution at the time of attenuation of two typical types of phosphorescent material radiation. FIG. 6 is a graph showing the spectral sensitivity of the SPD and the spectral transmittance of the correction filter according to the embodiment of the present invention. The horizontal axis is the wavelength (nm), the left vertical axis is the relative sensitivity, and the right vertical axis is the transmittance.

  As shown in FIGS. 2 to 4, the measurement unit 20 includes a switch Sw, a silicon photodiode (SPD) 21, a processing circuit 22, an LED 23, a solar cell (solar cell) 24, an IrDA communication unit 25, The switch Sw, SPD21, processing circuit 22, LED 23, solar cell 24, IrDA communication unit 25, and power supply unit 26 are substantially rectangular with four corners chamfered in plan view as shown in FIG. As shown in FIG. 3, it is housed in a flat, rectangular parallelepiped housing that is substantially flat when viewed from the side. On both side surfaces of the housing, a long groove 20a for attachment to the light shielding unit 1 is formed along the longitudinal direction. By inserting a guide 1a, which will be described later, into the groove 20a, the measurement unit 20 is attached to and held by the light shielding unit 1, and the SPD 21 of the measurement unit 20 faces the light receiving opening 1k provided in the light shielding unit 1. It can be arranged so as to face the measurement area 101 of the phosphorescent marker 100 through the light receiving opening 1k. A switch Sw having a pressed surface is mounted on the measurement unit 20, and the processing circuit 22 assigned to the switch Sw is turned on and off by pressing the pressed surface. The measurement unit 20 includes a solar cell (solar cell) 24 that converts light energy into electrical energy and power supplied from the solar cell 24 as a power source for supplying power to each part of the measurement unit 20 such as the processing circuit 22 that requires power. Is mounted with a power supply unit 26 for stable output at a predetermined voltage level, and IrDA communication for generating a drive signal for driving the LED 23 in order to perform data communication of the transmission data output from the processing circuit 22 by the IrDA method. An LED (red LED) 23 driven by the drive signal of the unit 25 and the IrDA communication unit 25 is mounted. A substantially rectangular window 25 is formed in the front face of the housing of the measurement unit 20, and the solar cell 24 and the LED 23 are disposed so as to face the window 25. Then, ambient light enters the solar cell 24 through the window 25 and light emitted from the LED 23 is emitted through the window 25.

  The processing circuit 22 provided in the measurement unit 20 is an example of a control unit, controls the SPD 21 which is an example of a light receiving unit that receives radiated light from a measurement area in the phosphorescent marker 100, and after a predetermined time elapses from the start of measurement. The emitted light from the measurement area is measured by the SPD 21. Further, the processing circuit 22 includes a storage unit 221 and stores the measurement value measured by the SPD 21 in the storage unit 221. The processing circuit 22 is also an example of a storage unit. The predetermined time is a time that should function as a sign even when light is shielded, and is, for example, 20 minutes.

  As described above, since the measurement unit 20 includes the SPD 21 as an example of the light receiving unit, the light reception sensitivity of the measurement unit 20 is the spectral sensitivity of the SPD 21. The curve shown in FIG. 5 is the spectral distribution of the phosphorescent material radiated light immediately after shading (solid line), after 2 minutes (dashed line), after 10 minutes (dashed line), and after 20 minutes (dashed line). Although it attenuates, it can be seen that the profile of the relative spectral distribution hardly changes. From this, regardless of the spectral sensitivity of the measurement unit 20, the luminance change rate from the start of measurement can be regarded as the received light amount change rate. Therefore, the spectral sensitivity of the SPD 21 itself that is the light receiving unit in the present embodiment is also measured. I can see that Furthermore, since the light receiving part of the measurement unit 20 is the SPD 21 without a light attenuating element such as a filter, for example, the use efficiency of the light beam is high, and high sensitivity and therefore high accuracy can be achieved.

  In the above description, the SPD 21 directly receives light without an optical element (filter) that modifies its relative spectral sensitivity. In addition, the SPD 21 provides a filter that reduces the wavelength dependence of spectral sensitivity upstream of the SPD 21 ( It is also possible to prepare for receiving the radiated light from the measurement area 101 in the phosphorescent marker 100 through this filter. More specifically, when there is even a slight change in the spectral distribution, the effect is smaller as the spectral sensitivity of the measurement unit 20 is flatter. Therefore, the wavelength dependence of the spectral sensitivity in the SPD 21 shown by the solid line in FIG. Flattening the combined spectral sensitivity in combination with a filter having a spectral transmittance indicated by a dotted line in FIG. 6 that cancels out contributes to accuracy improvement. That is, the filter has a spectral transmittance at which the combined spectral sensitivity combined with the spectral sensitivity of the SPD 21 is substantially flat. Thus, by further providing a filter that reduces the wavelength dependence of the spectral sensitivity of the SPD 21 upstream of the SPD 21, even if the spectral distribution of the radiated light of the phosphorescent label 100 may change somewhat during attenuation, there is an effect. It is difficult to receive and becomes highly accurate.

  On the other hand, the light-shielding unit 1 is detachably fixed to the phosphorescent marker 100 so that the SPD 21 as an example of the light receiving unit faces the measurement region 101 of the phosphorescent marker 100 and the measurement region 101 is shielded from ambient light. A fixing portion for mounting the fixing means.

  More specifically, as shown in FIGS. 2 and 3, the light-shielding unit 1 has a flat disk shape rising toward the center, that is, a relatively low frustoconical shape. Even if it is attached to 100, it is made into the shape with low possibility of giving a danger to a pedestrian.

  The fixed portion is provided at a predetermined position in the peripheral portion of the light shielding unit 1 (side surface of the truncated cone). In the example shown in FIGS. 2 and 3, the fixing portion is a region 1 </ b> A for mounting an adhesive tape 30 as the fixing means. In this area 1A, for example, a predetermined display is given to clearly indicate that this area is a fixed part. This predetermined display is, for example, coloring, characters, symbols (marks) or the like. This region 1A may be one or more, for example, two places at intervals of about 180 degrees, three places at intervals of about 120 degrees, and four places at intervals of about 90 degrees.

  Then, as shown in FIGS. 2 and 3, a substantially rectangular recessed portion 1 </ b> C in which the measurement unit 20 can be mounted is formed in the central portion of the light shielding unit 1. A light shielding plate 1B is provided at the bottom of the notch 1C, and a light receiving opening 1k is opened through the light shielding plate 1B at a predetermined position. Further, as shown in FIG. 3B, the side wall of the notch 1C perpendicular to the arrow A direction, which is the direction in which the measurement unit 20 moves relative to the light shielding unit 1, slides the measurement unit 20 in the arrow A direction. It also functions as a guide that guides into the notch 1C. More specifically, a guide 1a is projected on the side wall of the notch 1C, and has a shape that is paired with the shape of the guide 1a at a predetermined position on the outer surface of the measurement unit 20 corresponding to the guide 1a. The groove 20a is provided. The measuring unit 20 is attached to the light shielding unit 1 so that the guide 1a can be moved in the direction of arrow A by being fitted into the groove 20a from the inside. The measurement unit 20 moves in the direction of arrow A along the guide 1a, and as shown in FIG. 2B, the measurement unit 20 is accommodated in one end of the notch 1C and faces the SPD 21 in the light receiving opening 1k. As shown in FIG. 2A, it is possible to take the measurement position and the retracted position where the measurement unit 20 is located at the other end of the notch 1C. Further, the position of the switch Sw is set so that a specific part of the guide 1a presses the pressed surface of the switch Sw as the measurement unit 20 moves from the retracted position to the measurement position. When the light shielding unit 1 is attached to the phosphorescent marker 100, the measurement unit 20 is in the retracted position, and the operator can visually recognize the light receiving opening 1k opened in the light shielding plate 1B at the bottom of the notch 1C, and the light receiving opening 1k. The light shielding unit 1 can be positioned so that is in the light emitting area 101 of the phosphorescent sign 100.

  As described above, the light shielding unit 1 of the example shown in FIGS. 2 and 3 includes the SPD 21 and the processing circuit 22 (control) such that the SPD 21 faces the light receiving opening 1k provided on the light shielding plate 1B (predetermined surface) having light shielding properties. The measuring unit 20 containing the storage unit and the storage unit) can be attached. Furthermore, the light shielding unit 1 is an adhesive tape for removably fixing the phosphorescent marker 100 to the phosphorescent marker 100 for at least a predetermined time so that the light receiving opening 1k faces the measurement region of the phosphorescent marker 100 and the measurement region is shielded from ambient light. It has the area | region 1A for mounting | wearing 30.

  The residual luminance measuring apparatus S of the present embodiment includes a measurement unit 20 that houses the SPD 21 and the processing circuit 22 and a light shielding unit 1 having a notch 1C. The light shielding unit 1 includes the notch 1C. When the measurement area 101 of the phosphorescent marker 100 is not visible, the SPD 21 is visible through the light receiving opening 1k when the measurement unit 20 is attached to the measurement position of the notch 1C. The operator can easily fix the residual luminance measuring device S for a predetermined time by the adhesive tape 30 with the SPD 21 facing the measurement region 101 while facing the measurement region 101 in 100.

  Here, the set of the light shielding unit 1 and the measurement unit 20 is an example of a housing. The light shielding unit 1 and the measurement unit 20 may be integrally formed. Furthermore, a light-shielding member (such as candy paper) may be attached to the outer surface of the light-shielding plate 1B that is in contact with the phosphorescent sign 100. Further, a flange may be further provided on the outer periphery of the light shielding unit 1, and the region 1A may be disposed on the flange.

  According to the above configuration, the residual luminance measuring apparatus S according to the present embodiment does not bother the operator after fixing the light shielding unit 1 and the measurement unit 20, and the residual luminance from the start of measurement to a predetermined time later. Can be measured.

  FIG. 7 is a configuration diagram of the reference measurement unit according to the embodiment of the present invention. FIG. 8 is a block diagram showing an electrical configuration of the processing unit according to the embodiment of the present invention. FIG. 9 is a graph showing the relative spectral distribution and relative spectral luminous efficiency of typical luminous material radiated light. The horizontal axis in FIG. 9 is the wavelength (nm), and the vertical axis indicates the intensity.

  The reference measurement unit 40 measures the initial luminance of the phosphorescent sign 100 and outputs the measurement value to the processing unit 50 via the cable 46. The light receiving unit of the reference measuring unit 40 is composed of a silicon photodiode (SPD) 41, and further upstream of the SPD 41 (for receiving incident light) in order to convert the photometric quantity into luminance, which is the intensity of the human eye. And a light receiving angle regulating cylinder 44 that regulates the light receiving angle of the SPD 41. The SPD 41, the Vλ filter 43, and the light receiving angle regulating cylinder 44 are housed in a housing similar to the housing of the measurement unit 20 that can be attached to the light shielding unit 1. The light receiving angle regulating cylinder 44 is a cylinder, and a Vλ filter 43 and an SPD 41 are disposed at one end thereof, and light incident from the measurement opening 45 at the other end passes through the Vλ filter 43 and passes through the SPD 41. Received light. As will be described later, the measurement opening 45 of the light reception angle regulating tube 44 faces the light reception opening 1k during measurement, and regulates the light reception angle of the SPD 41 with respect to the radiated light from the measurement area 101. As a result, the angle at which the SPD 41 looks at the measurement object is constant, and the sensor output of the SPD 41 does not depend on the actual size as long as the measurement object covers the angle. The Vλ filter 43 has a spectral transmittance such that the combined spectral sensitivity with the spectral sensitivity of the SPD 41 approximates the relative spectral luminous efficiency Vλ of the eye as shown by the dotted line in FIG. For example, a combination of absorption filters or a multilayer film. The reference measurement unit 40 is calibrated in advance with a reference light source and functions as a luminance meter for a uniform surface light source that can be regarded as a Lambertian light source such as at least the phosphorescent sign 100. Since the spectral distribution of typical phosphorescence shown by the solid line in FIG. 9 is steep with a half-value width of about 100 nm, an error from the relative spectral luminous efficiency of the spectral sensitivity of the measuring apparatus may cause a large measurement error. is there.

  The reference measurement unit 40 has the same external shape as the measurement unit 20 and can be attached to the cutout portion 1 </ b> C of the light shielding unit 1. When the reference measurement unit 40 is attached to the measurement position of the light shielding unit 1, the measurement opening 45 is provided at a predetermined position of the reference measurement unit 40 corresponding to the light reception opening 1k so that the measurement opening 45 faces the light reception opening 1k. It is done. When the reference measurement unit 40 is inserted, the measurement opening 45 faces the light receiving opening 1k of the light shielding unit 1, and the measurement area 101 and the SPD 41 of the phosphorescent marker 100 are shielded from external light.

  During the initial luminance measurement, it is necessary to maintain the correct positional relationship between the phosphorescent marker 100 and the reference measurement unit 40 and sufficient light shielding. However, since the initial luminance measurement time is 1 s or less, the burden on the operator is small. . The reference measurement unit 40 is connected to the processing unit 50 by a cable 46, is supplied with power from the processing unit 50, and is operated using a switch of the processing unit 50. The photometric quantity in the reference measurement unit 40 is output to the processing unit 50, and the processing unit 50 converts the photometric quantity into luminance, which is the intensity for the human eye, and stores it for each of the phosphorescent signs 100-1 to 100-N. To do.

  The processing unit 50 measures the rate of change in the amount of received light from the start of measurement to a predetermined time later. The residual luminance in the later measurement area 101 is obtained.

  More specifically, as shown in FIG. 8, the processing unit 50 includes a display unit 51 that performs predetermined display, an IrDA communication unit 52 that performs data communication using an IrDA method, and a processing circuit 53 that performs predetermined processing. It has. The processing circuit 53 provided in the processing unit 50 calculates the rate of change in the amount of received light from the start of measurement until the elapse of a predetermined time based on the measurement value input from the measurement unit 20 via the IrDA communication unit 52, and the reference measurement unit 40, multiplied by the initial luminance stored for each of the phosphorescent signs 100-1 to 100-N, and output to the display unit 51 as residual luminance after a predetermined time has elapsed.

  Hereinafter, for a plurality of (for example, ten) phosphorescent signs 100, the measurement procedure in the case where the residual luminance in each measurement area of the phosphorescent signs 100 is measured by the residual luminance measuring device S will be described.

<Attaching the shading unit to the luminous sign>
The operator prepares 10 light shielding units 1 to measure each of a plurality of, for example, 10 phosphorescent signs 100 (100-1 to 100-N (N = 10)), as shown in FIG. Each light-shielding unit 1 is attached to each phosphorescent marker 100-1 to 100-10 with an adhesive tape 30, respectively. The operator can visually recognize the light receiving opening 1k opened in the light shielding plate 1B in contact with the phosphorescent marker 100 at the bottom of the notch 1C, and the light shielding unit 1k comes to the measurement area 101 of the phosphorescent marker 100. 1 can be positioned.

<Measurement of initial luminance by reference measurement unit>
Next, the operator inserts the reference measurement unit 40 into the notch 1C and moves it to the measurement position shown in FIG. 2B, and radiates from the measurement area 101 of the phosphorescent marker 100 facing the light receiving opening 1k. Measure the light intensity. Even if the reference measurement unit 40 is attached to the light shielding unit 1, as described above, the operator can place the reference measurement unit 40 at the retracted position shown in FIG. The light-shielding unit 1 can be positioned so that the light-receiving opening 1k opened in the light-shielding plate 1B can be visually recognized and the light-receiving opening 1k is in the measurement area 101 of the phosphorescent marker 100. The reference measurement unit 40 is calibrated in advance using a reference light source. The processing circuit 53 converts the photometric quantity measured by the reference measurement unit 40 into luminance that is intensity with respect to the human eye, and stores it for each phosphorescent marker 100.

<Measurement of luminance change rate by measurement unit 20>
Ten measurement units 20 are prepared corresponding to the number of light shielding units 1. Next, the operator removes the reference measurement unit 40 from the light shielding unit 1 and attaches the measurement unit 20 to the light shielding unit 1. Even if the measurement unit 20 is attached to the light shielding unit 1, as described above, the operator can place the measurement unit 20 at the retracted position shown in FIG. The light-shielding unit 1 can be positioned so that the light-receiving opening 1k opened in 1B can be visually recognized and the light-receiving opening 1k is in the measurement area 101 of the phosphorescent marker 100. Next, the operator moves the measurement unit 20 to the measurement position shown in FIG. The light receiving portion of the measurement unit 20 faces the light receiving opening 1k of the light shielding unit 1 at the measurement position. At the beginning of the movement, the switch Sw hits the guide 1a and is turned on, and the measurement unit 20 is automatically activated. As a result, the operator can save the start-up effort and can further reduce the burden on the operator. The processing circuit 22 of the measurement unit 20 starts measuring time and repeats the measurement of the amount of light received by the light receiving unit configured only by the SPD 21 at predetermined time intervals and the storage of the measured value processing circuit 22 in the storage unit. The measurement interval is short, for example, about 0.1 s in the initial stage, and is long to about 10 s near the end of measurement. During the movement of the measurement unit 10 for about 1 second after activation, the SPD 21 of the measurement unit 20 is opposed to the light shielding plate 1B of the light shielding unit 1 and the incident light is blocked, and the amount of light received during this time becomes an offset signal. When the measurement unit 20 reaches the measurement position, the SPD 21 of the measurement unit 20 faces the light receiving opening 1k of the light shielding unit 1, so that the amount of received light increases rapidly. The processing circuit 22 stops the measurement when a predetermined measurement time elapses, and repeatedly outputs all data stored by IrDA by the LED 23 to the processing unit 50. The lighting of the LED 23 is confirmed by the operator through the window 25, and the end of the change rate measurement is recognized.

<Measurement of multiple phosphorescent signs 100>
The operator performs, for example, 10 operations from “attaching the light shielding unit 1 to the phosphorescent sign 100” to “moving the measurement unit 20 to the measurement position” in “measurement of the luminance change rate by the measurement unit 20”. Repeat for phosphorescent sign 100. As a result, the initial luminance of each phosphorescent marker 100 is measured and stored, and the measurement of the received light amount change rate is started.

<Data reading and calculation of residual luminance>
The processing unit 50 reads out data from the measurement unit 20 attached to the plurality of phosphorescent signs 100 and calculates the residual luminance. For example, the operator measures the initial luminance of the ten phosphorescent signs 100, and reads the data stored in the processing circuit 22 in order from the measurement unit 20 in which the LED 23 is lit. By bringing the IrDA communication unit 52 of the processing unit 50 into close contact with the window 25 of the measurement unit 20, the IrDA communication unit 52 reads information transmitted by the LED 23. The processing unit 50 identifies the offset signal from the read data, offset-corrects all the data thereby, calculates the rate of change in the amount of received light from the initial time until the lapse of a predetermined time, and stores the luminous sign in the processing circuit 53. The initial luminance stored every 100 is multiplied and output to the display unit 51 as the residual luminance after a predetermined time has elapsed.

  In the present embodiment, although the spectral sensitivity approximates the relative spectral luminous efficiency Vλ and requires calibration, one high-cost reference measurement unit 40 is required. , It can be configured with only the SPD 21 and is low in cost. For this reason, the cost performance of the whole system is high.

  In the present embodiment, the measurement interval is changed from the initial 0.1 s to 10 s after 20 minutes. However, data is acquired at an interval of 0.1 s for 20 minutes, and continuous as shown in FIG. If there is a sudden change different from the attenuation, this may be corrected by subtracting the change from the measured value as a change in the mounting state of the measurement unit 20 or the light shielding unit 1, and the reliability of the data A message warning that there is a problem may be output to the display unit 51.

  In the present embodiment, the residual luminance is obtained from the initial luminance sequentially measured by one reference measurement unit 40 and the change rate after a predetermined time has elapsed from the start of measurement measured in parallel by a plurality of measurement units 20. The residual luminance may be directly measured by a plurality of measurement units 20 having a light-receiving unit according to the measurement unit 40 and calibrated as a luminance meter.

  According to the present embodiment, after fixing the residual luminance measuring device S, it is possible to measure the residual luminance after a predetermined time without bothering the operator.

  In addition, since the fixing for a predetermined time is performed by the adhesive tape 30, the fixing and removing of the residual luminance measuring device S for a predetermined time can be performed at low cost and efficiently.

  And according to this Embodiment, it is comprised from the measurement unit 20 which accommodates SPD21 and the processing circuit 22, and the light-shielding unit 1 to which the measurement unit 20 is attached, and the light-shielding unit 1 is in the state where the measurement unit 20 is not attached. The measurement area 101 in the phosphorescent sign 100 is visible at (the retracted position), and the SPD 21 faces the measurement area 101 in the phosphorescent sign 100 when the measurement unit 20 is attached (the measurement position). The person can easily fix the residual luminance measuring device S for a predetermined time by making the SPD 21 face the measurement area 101 in the phosphorescent sign 100.

  Further, in another embodiment, the processing circuit 53 stores in advance the relationship between the spectral luminous efficiency and the spectral sensitivity of the SPD 21 with respect to the radiated light from the measurement area 101 of the luminous label 100 by the SPD 21. Based on this relationship, the measured value may be converted into a value with spectral luminous efficiency. To give a more specific example, when the spectral distribution of radiated light in the phosphorescent marker 100 to be measured is two types of FIG. 5A and FIG. 5B, the Vλ filter 43 of the light receiving unit is omitted, As for the spectral sensitivity of the SPD 41 itself, the measurement value of the measurement unit 20 can be converted into luminance for these two types of phosphorescent labels 100. That is, using the two types of phosphorescent light sources monitored by a luminance meter having a spectral sensitivity approximating the relative spectral luminous efficiency Vλ as a reference light source, each conversion coefficient is obtained, and each conversion coefficient is stored in the processing circuit 53 in advance. At the time of measurement, the operator selects a conversion coefficient according to the phosphorescent marker 100 to be measured, so that the processing circuit 53 converts the measured value into a value (luminance) based on the conversion coefficient based on the conversion coefficient. To do.

  According to this configuration, it is not necessary to provide a filter for approximating the spectral sensitivity of the SPD 21 to the spectral luminous efficiency, and the reference measurement unit 40 is also unnecessary, so that it can be configured at a low cost and a large number for efficient measurement. Even if one residual luminance measuring device S is used, there is no significant increase in cost.

  Moreover, in the above-mentioned embodiment, although the fixing | fixed part was the area | region 1A for mounting | wearing the adhesive tape 30 as an example of a fixing means, it is not limited to this. For example, the fixing portion may be a region 1A for mounting a suction cup as an example of the fixing means, and the light shielding unit may further include a suction cup attached to the fixing portion.

  FIG. 10 is a cross-sectional view of a measurement unit and a light shielding unit according to another embodiment of the present invention. As shown in FIG. 10, the light shielding unit 10 including the suction cup 11 as another example of the fixing means has a plurality of recesses 10 </ b> D for mounting the suction cup 11 on the bottom surface of the housing of the light shielding unit 10. In each of these recesses 10D, there is a suction cup 11 for removably fixing the light shielding unit 10 to the phosphorescent marker 100 so that the SPD 21 faces the measurement region 101 in the phosphorescent marker 100 and shields the measurement region 101 from ambient light. Each is provided. More specifically, the light-shielding unit 10 has a low and high truncated conical shape having a notch 1C as in the light-shielding unit 1, and the bottom surface thereof has, for example, two peripheral portions, for example, three peripheral portions. A plurality of recesses 10D such as four are formed, and suction cups 11 are provided in the respective recesses 10D. Further, for example, the light shielding unit 10 is, for example, a low and high columnar shape having the same notch portion 1C as described above, and a plurality of recesses 10D are formed on the bottom surface thereof, for example, at the peripheral portion thereof. A suction cup 11 is provided in each recess 10D. Further, for example, the light shielding unit 10 is, for example, a low columnar shape having the same notch portion 1C as described above, and has a flange at the upper end thereof, and a plurality of suction cups 11 are provided on the lower surface of the flange. Is provided. Such a suction cup 11 has better detachability operability than the adhesive tape 30, and as a result, the burden on the operator is further reduced.

  Further, the measurement unit 20 can be attached to both the light shielding unit 1 and the light shielding unit 10, and the light shielding unit 1 and the light shielding unit 10 may be selectively used according to the installation state of the phosphorescent sign 100. For example, the light shielding unit 1 is used for the luminous sign 100 disposed on the floor surface, and the light shielding unit 10 is used for the luminous sign 100 disposed on the wall surface.

  In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

S Residual Luminance Measuring Device Sw Switch Vλ Relative Spectral Luminous Efficiency 1, 10 Shading Unit 1A Area 1B Shading Plate (predetermined surface)
1C Notch 1a Guide 1k Light-receiving opening 10D Recess 11 Suction cup 20 Measuring unit 20a Groove 21 SPD
22 Processing Circuit 30 Adhesive Tape 40 Reference Measurement Unit 41 SPD
43 Filter 44 Receiving Angle Regulating Tube 45 Measurement Aperture 50 Processing Unit 51 Display Unit 52 IrDA Communication Unit 53 Processing Circuit 100 Phosphorescent Sign 101 Light Emitting Area

Claims (8)

A residual luminance measuring device for measuring the residual luminance of a measurement area in a shading phosphorescent sign,
A reference measurement unit for obtaining in advance the initial luminance value of the measurement area in the phosphorescent sign;
A light receiving portion for receiving the radiated light from the measurement area in the phosphorescent sign;
A control unit for controlling the light receiving unit, and measuring the emitted light from the measurement area from the start of measurement until a predetermined time has elapsed, by the light receiving unit;
A storage unit for storing measurement values measured by the light receiving unit;
A housing for housing the light receiving unit, the control unit, and the storage unit , the light receiving unit facing a measurement area in the phosphorescent sign , and shielding the measurement area from ambient light ;
The controller is
Based on the measurement value measured by the light receiving unit, the light reception amount change rate from the measurement start to the predetermined time later is calculated, and from the initial luminance value and the light reception amount change rate acquired before the measurement start. A residual luminance measuring apparatus for obtaining a residual luminance of the measurement area after the predetermined time . The light receiving portion includes a silicon photodiode (SPD), the light receiving side of the silicon photodiode, according to claim 1, characterized in that no optical elements to modify the relative spectral sensitivity of the silicon photodiode Residual luminance measuring device. The light receiving unit includes a silicon photodiode (SPD),
The storage unit stores in advance the relationship between the spectral luminous efficiency and the spectral sensitivity of the silicon photodiode with respect to the radiation from the measurement area,
The residual luminance measurement apparatus according to claim 1 , wherein the control unit converts the measurement value into a value with spectral luminous efficiency based on the relationship. 4. The light receiving unit according to claim 1, further comprising a filter that reduces the wavelength dependence of spectral sensitivity, and receiving the emitted light from the measurement area of the phosphorescent marker through the filter. The residual luminance measuring apparatus according to any one of the above. The housing includes a fixing portion for detachably fixing to the phosphorescent sign,
The fixed portion, the residual luminance measuring device according to any one of claims 1 to 4, characterized in that an area for mounting the pressure-sensitive table. The housing includes a fixing portion for detachably fixing to the phosphorescent sign,
The fixing portion is an area for mounting the sucker,
The residual luminance measuring device according to any one of claims 1 to 4 , further comprising a suction cup attached to the fixed portion. The housing includes a measurement unit that houses the light receiving unit, the control unit, and the storage unit, and a light shielding unit having an attachment part for attaching the measurement unit, and the light shielding unit is attached to the measurement unit. The measurement area is visible when not attached to a part, and the light receiving part faces the measurement area when the measurement unit is attached to the attachment part. Item 7. The residual luminance measuring apparatus according to any one of Items 6 above. A residual luminance measurement system for measuring each residual luminance in a plurality of phosphorescent signs,
A plurality of light-shielding units that respectively shield the measurement areas of the plurality of phosphorescent signs;
In the state where the measurement area is shielded from light by the light shielding unit, the measurement of the amount of received light from the measurement area is started, and the measurement is stopped after a predetermined time from the start of measurement. Multiple measuring units to be executed on
An initial luminance measuring unit for measuring each initial luminance in the plurality of phosphorescent signs before starting measurement in the plurality of measuring units;
Said plurality of based on the measured value of the light receiving quantity measured respectively by the measurement unit, the received light amount change rate from the start of measurement until after the predetermined time, calculated for each of the plurality of storing sign, each of the light receiving and amount change rate based on the respective initial brightness measured respectively by the initial brightness measuring unit, further comprising a processing unit for determining the respective residual luminance after the predetermined time in the plurality of storing sign,
Residual luminance measurement system.

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