JP4783109B2 - Luminous intensity measuring instrument - Google Patents

Description

  The present invention relates to a luminous intensity measuring device for measuring the afterglow luminance of a luminous sign.

  Japanese Industrial Standard Z9107 defines a safety sign board that visually transmits and displays warnings, instructions, information, and the like regarding safety. This safety sign board includes a phosphorescent safety sign board. The phosphorescent safety sign board is a sign board in which the surface of a substrate made of synthetic resin, ceramics or glass is processed with a phosphorescent material and a safety sign is designed with a color material.

  The luminous material absorbs light such as sunlight and fluorescent lamps, accumulates the energy, and releases the accumulated energy as visible light. A phosphorescent sign such as a phosphorescent safety sign can be visually recognized by the phosphorescence when the surroundings become dark. Since the luminous sign does not use artificial lighting, it can be seen even when it becomes dark due to a power failure.

  The phosphorescent sign phosphorescence will become invisible over time. In recent years, in the case of strontium aluminate or calcium aluminate used as a phosphorescent material, it can be visually recognized until about 10 hours in the dark. In the case of zinc sulfide or the like, it becomes invisible in a few hours.

In order to function as a sign in a dark place, it is necessary to have the necessary brightness when the required time has elapsed. For example, a phosphorescent safety sign board is required to have a phosphorescence luminance of 24 mcd / m ² or more after 20 minutes.

  A luminance meter such as a spot meter can be used to measure the afterglow luminance of the phosphorescent marker. For example, before measurement, the phosphorescent sign is stored for several hours in a dark place, and then stored by irradiating with light having a predetermined illuminance. Thereafter, the phosphorescent sign is placed in the dark again, and the afterglow luminance of the phosphorescent sign is measured with a luminance meter.

  Until the phosphorescent marker is installed, the afterglow luminance of the phosphorescent marker can be measured by the method as described above. However, it is difficult to measure by the above-mentioned method after the phosphorescent sign is installed. In many cases, a phosphorescent sign is installed in a facility or an underground shopping area. In such a case, in order to measure the afterglow brightness of the phosphorescent sign, the lighting of the facility or the underground shopping mall must be turned off.

  The present invention has been made in view of such problems in the prior art, and a phosphorescence luminance measuring device capable of easily measuring the afterglow luminance of a phosphorescent sign regardless of the environment where the phosphorescent sign is installed. It is intended to provide.

In order to achieve the above object, the present invention provides a photometric unit having a proximity surface smaller than a phosphorescent portion of a phosphorescent marker, a light receiving unit that receives light from a light receiving surface provided on the proximity surface, and the proximity surface A rubber-like light-shielding elastic body that shields light incident on the light-receiving surface from outside the region facing the light-receiving surface of the phosphorescent sign by being disposed around the light-receiving surface , Means for calculating an afterglow luminance of the phosphorescent marker according to a light reception result when the elastic body for light shielding is in close contact with the phosphorescent marker, a shaft having a grip, and the grip on the side opposite to the grip of the shaft Provided is a luminous intensity measuring device provided with a universal joint for connecting the photometry unit to an end .

  By adopting such a configuration, the phosphorescence luminance measuring device of the present invention can easily increase the afterglow luminance of the phosphorescent sign even when the phosphorescent sign is installed on the wall surface of a facility or an underground shopping center or on a staircase. Can be measured.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment, the present invention is embodied as a luminous intensity measuring device that measures the afterglow luminance of a luminous safety sign board.

  FIG. 1 is a diagram showing an example of the appearance of a luminous intensity measurement device in the present embodiment. This phosphorescent luminance measuring instrument 101 is used with the photometric unit 102 in close contact with the phosphorescent safety sign board 103. In addition to the measurement unit 102, the phosphorescent luminance measuring device 101 includes a shaft unit 104, a grip unit 105, a display unit 106, and a universal joint unit 107. The shaft portion 104 has a grip portion 105 at one end thereof. The user holds the luminous intensity measuring device 101 with the grip unit 105. The display unit 106 is disposed on the upper surface of the grip unit 105. The display unit 106 includes a display device such as a liquid crystal display, and displays the afterglow luminance of the phosphorescent safety sign board 103. A universal joint portion 107 is provided at the other end of the shaft portion 104. The universal joint 107 has a ball joint, and connects the photometric unit 102 to the shaft unit 104 and positions the photometric unit 102 at various angles.

  The phosphorescent safety sign board 103 has a color material portion 108 and a phosphorescent portion 109. In this example, the arrow part for guiding is the color material part 108, and the other part is the phosphorescent part 109. If the phosphorescent safety sign plate 103 is illuminated with external light, the color material portion 108 can visually recognize the arrow portion. If the periphery of the phosphorescent safety sign 103 is dark, the arrow portion can be visually recognized by the afterglow of the phosphorescent unit 109. In FIG. 1, this luminous safety sign board 103 is installed on the wall surface 110. The phosphorescent safety sign plate 103 is installed at a location where the wall surface 110 is adjacent to the wall surface 111 or the floor surface 112.

  When measuring the afterglow luminance of the phosphorescent safety sign board 103 using the phosphorescent luminance measuring device 101, the user holds the grip portion 105 to support the phosphorescent luminance measuring device 101, and the phosphorescent portion 109 of the phosphorescent safety sign plate 103. The photometric unit 102 is pressed against By bringing the photometry unit 102 into close contact with the light storage unit 109, harmful light from outside the photometry region can be shielded, and afterglow from the measurement region can be measured. Since the phosphorescent luminance measuring device 101 has the shaft portion 104 and the universal joint portion 107, even if the phosphorescent safety sign 103 is installed at the above-described location, the user needs to take an unreasonable posture. Absent. For this reason, the user can fix the photometry part 102 easily for the time required to measure the afterglow brightness | luminance of the luminous safety sign board 103. FIG. Moreover, since the display part 106 is arrange | positioned at the grip part 105, it is also easy for a user to confirm the afterglow brightness | luminance of the phosphorescent safety sign board 103. FIG.

  FIG. 2 is an enlarged view showing an example of the appearance of the photometry unit. The photometric unit 102 includes a light blocking unit 201 and a light receiving unit 202 on the side of the surface that is in contact with the phosphorescent safety sign plate. A rubber-like elastic body is used for the light shielding portion 201. The rubber-like elastic body is deformed by pressing the photometry unit 102 against the phosphorescent safety sign plate, and the adhesion between the light shielding unit 201 and the phosphorescent safety sign plate is ensured. In this example, the light shielding part 201 forms an annular contact surface. The light receiving unit 202 is disposed at the center of the contact surface. The light receiving unit 202 receives afterglow from the phosphorescent safety sign board. When the light shielding unit 201 and the phosphorescent safety sign plate are in close contact with each other, light from outside the phosphorescent safety sign plate is shielded, so that no light is irradiated to the region facing the light receiving unit 202 of the phosphorescent safety sign plate. In addition, afterglow from a region in close contact with the light shielding portion 202 of the phosphorescent safety sign board is also shielded. Since the light shielding unit 201 blocks harmful light from outside the region facing the light receiving unit 202 of the phosphorescent safety sign board, the light receiving unit 202 can receive only afterglow from the region. If a rubber-like elastic body is used, it is easy for the user to keep the light shielding state.

  FIG. 3 is a cross-sectional view of an example of the photometry unit. The photometric unit 102 has a proximity surface 301 that is smaller than the phosphorescent unit 109 of the phosphorescent marker plate 103. The proximity surface 301 is made smaller than the phosphorescent portion 109 of the phosphorescent marker plate 103 even if there is an obstacle around the phosphorescent marker plate 103, the metering unit 102 interferes with the obstacle, and the metering unit 102 is phosphorescent. This is to avoid a situation where the sign plate 103 cannot be brought into close contact with the sign plate 103 as much as possible. For example, in the case where the phosphorescent sign board 103 is installed at the rise of a staircase, if the proximity surface 301 is large, it easily interferes with the stepboard of the staircase. If it is an installation location like the example of FIG. 2, the photometry part 102 will interfere easily with another wall surface or a floor surface. The proximity surface 301 is provided smaller than the phosphorescent portion 109 of the phosphorescent marker plate 103 so that the afterglow luminance of the phosphorescent marker plate 103 can be measured even in such an installation location. Since the phosphorescent sign plate 103 is processed so that the afterglow luminance is almost uniform over the entire surface of the phosphorescent sign plate 103, the afterglow is measured only for a part of the phosphorescent portion 109 of the phosphorescent sign plate 103. But there is almost no hindrance.

  The light shielding unit 201 and the light receiving unit 202 of the photometric unit 102 are provided on the proximity surface 301 thereof. In the example of FIG. 3, the structure of the light shielding portion 201 is slightly different from the example of FIG. In the example of FIG. 3, a rubber-like elastic body 302 having an annular shape is disposed on the proximity surface 301, and the close contact surface of the elastic body 302 slightly protrudes from the proximity surface 301. With such a structure, if the measurement unit 102 is pressed against the phosphorescent safety sign plate 103, the elastic body 302 is sufficiently elastically deformed, and the adhesion between the photometry unit 102 and the phosphorescent safety sign plate 103 can be appropriately secured. it can. The point that the light receiving unit 202 is arranged at the center of the elastic body 302 is the same as the example of FIG.

  The light receiving unit 202 is provided with an opening 303, and a protective window 304 is disposed slightly behind the opening 303. A light receiving element 305 is arranged on the further back side of the protective window 304. A photoelectric conversion element such as a photodiode can be used as the light receiving element 305, and an electric signal is generated according to light incident through the protective window 304. The output of the light receiving element 305 is connected to the substrate 306. The substrate 306 generates digital data according to the analog electric signal from the light receiving element 305 and outputs it to the signal line 307. The signal line 307 is inserted into the universal joint portion 107 and the shaft portion 104, and is connected to a signal processing circuit provided in the grip portion. Digital data representing the photometric result is transmitted from the substrate 306 to the signal processing circuit through the signal line 307.

  FIG. 4 is a diagram for schematically explaining an example of the electrical configuration of the luminous intensity measuring device. When the light receiving element 305 receives light from the phosphorescent safety sign board, the light receiving element 305 outputs an analog electric signal corresponding to the light to the substrate 306. The substrate 306 is provided with an analog processing circuit 401, an AD converter 402, and the like. The analog processing circuit 401 amplifies or samples and holds the input analog electric signal. The AD converter 402 converts the held electrical signal into digital data for each sampling period.

  The output of the substrate 306 is connected to the signal processing circuit 403. A dedicated circuit or a general-purpose circuit can be used for the signal processing circuit 403. Here, a general-purpose circuit is used for the signal processing circuit 403. The signal processing circuit 403 includes a bus 404. An interface circuit 405 for the board 306 is connected to the bus 404. The signal processing circuit 403 receives digital data from the substrate 306 through the interface circuit 405. In addition to the interface circuit 405, a RAM 406, a ROM 407, and a CPU 408 are connected to the bus 404. The RAM 406 can store digital data received from the board 306. The ROM 407 stores signal processing and control programs, setting data, and the like. The CPU 408 performs calculations for signal processing and control in accordance with the instructions of the program. Based on the data read from the RAM 406, the CPU 408 calculates the afterglow luminance of the phosphorescent safety sign board when a predetermined time has elapsed from the start of measurement.

  An interface circuit 409 for the display unit 106 is also connected to the bus 404. The signal processing circuit 403 in this embodiment also controls the display unit 106 through the interface circuit 409. The display unit 106 includes operation buttons 411 and 412 in addition to the display 410 for displaying the measurement result. For example, the operation button 411 is a menu selection button, and the operation button 412 is a decision button. The user selects a menu item using the operation button 411 and confirms the selection using the operation button 412. Menu items include initial settings, calibration, and measurement execution. Calibration can be performed by measuring a reference plate having a known afterglow luminance. When the user selects an item for performing measurement and performs an operation to confirm the selection, the signal processing circuit 403 takes in digital data representing the photometric result into the RAM 406. This digital data is sequentially stored in the RAM 406 for each sampling period. When the necessary sample is obtained, the CPU 408 calculates the afterglow luminance of the phosphorescent safety sign board from the value of the sample. When measuring the afterglow luminance after 20 minutes from the start of measurement, for example, a sample after 20 minutes has been obtained from the RAM 406, and the afterglow luminance can be calculated based on the sample. Even when the afterglow luminance after 20 minutes from the start of measurement is calculated, the afterglow luminance after 20 minutes may be calculated using a sample before that time. For example, a time-series decay characteristic of afterglow luminance is approximated from a sample from the start of measurement for 10 minutes, and the afterglow luminance after 20 minutes is calculated using the approximation function. If such an approximation is used, the time required for measurement can be shortened. When the CPU 408 calculates the afterglow luminance, the CPU 408 displays the calculation result on the display 410. When a condition is given to the afterglow luminance, a determination result as to whether or not the condition is satisfied may be displayed on the display 410.

  FIG. 5 is a diagram showing an example of measurement results. It is the result of having measured about the luminous sign made from earthenware, the horizontal axis shows the elapsed time from the start of measurement, and the vertical axis shows the measured luminance value. In this figure, the data series by the luminous intensity measuring device of the present invention is indicated by a triangle mark, a circle mark, and a cross mark. The triangle mark indicates the case where the size of the light shielding surface is φ23, the circle mark indicates the case where the size of the light shielding surface is φ30, and the × mark indicates the case where the size of the light shielding surface is φ40. The size of the light receiving surface is φ6. For comparison, a data series by a general luminance meter is indicated by diamonds. The measurement with the luminous intensity measuring device of the present invention is performed with the 200 lux illumination turned on, and the measurement with the luminance meter is performed after the 200 lux illumination is performed for one hour and then the illumination is turned off. The measurement result by the phosphorescence luminance measuring device is almost the same as the measurement result by the luminance meter. In this example, even if the size of the light shielding surface is changed, the result is not greatly affected. However, depending on the type of phosphorescent sign, the size of the light shielding surface may affect the light shielding surface. If the light shielding surface is made larger, harmful light can be shielded more reliably. However, if the light shielding surface is too large, it will be easy to interfere with obstacles around the sign or it will be difficult to grasp the measurement location.

  As described above, in the phosphorescence luminance measuring device according to the present embodiment, afterglow from a part of the phosphorescent part of the phosphorescent sign is measured, and the afterglow luminance is calculated from the photometric result. Even when a phosphorescent sign is installed on the stairs or the like, the afterglow brightness of the phosphorescent sign can be easily measured without turning off the illumination.

  The above-described embodiments do not limit the technical scope of the present invention, and various modifications and applications are possible within the scope of the present invention. For example, the afterglow luminance of general signs and other phosphorescent signs can be measured by the phosphorescence luminance measuring device of the present invention, similarly to the afterglow luminance of the phosphorescent safety sign board.

  Further, the shape of the contact surface of the light shielding portion is not limited to an annular shape, and may be a rectangle, an ellipse, or the like. Further, an annular and hollow elastic member may be further arranged on the outermost peripheral portion of the proximity surface, so that the adhesion when the proximity surface is slightly inclined may be more reliably maintained.

  Moreover, you may make it provide the function which detects the contact | adherence state with respect to the luminous sign of a photometry part in a luminous intensity measuring device. For example, a pressure sensor may be disposed on the contact surface of the photometry unit or the contact surface of the light shielding unit, and the signal processing circuit may determine the contact state from the output of the sensor. Further, when the light shielding state is not sufficient, the influence appears on the signal from the light receiving element. The signal processing circuit may determine the light shielding state by determining the presence or absence of the influence from the digital data. In this way, if the close contact state of the measuring unit with respect to the phosphorescent sign is detected and the detection result is notified to the user through the display unit or the like, the user can easily and quickly grasp whether or not the measurement is accurately performed. It becomes possible.

  Furthermore, although the afterglow brightness | luminance of the luminous sign was calculated by the signal processing circuit incorporated in the grip part in the above-mentioned example, it is not restricted to this. For example, digital data may be output to an external device such as a personal computer, and the afterglow luminance may be calculated and displayed by the external device. Also, instead of connecting the photometry unit and the signal processing circuit in a wired manner as in the above-described embodiment, both are connected wirelessly, and the signal processing circuit and the display unit are arranged in a separate unit separated from the phosphorescence intensity measuring device main body. You may make it do.

  According to the phosphorescence luminance measuring instrument according to the present invention, the afterglow from a part of the phosphorescent part of the phosphorescent sign is measured, and the afterglow luminance is calculated from the photometric result. Even if a phosphorescent sign is installed at the rise of the lamp, the afterglow luminance of the phosphorescent sign can be easily measured, which is useful for measuring the afterglow luminance of various phosphorescent signs in various environments. is there.

The figure which shows an example of the external appearance of the luminous luminance measuring device in this Embodiment The figure which expands and shows an example of the appearance of a photometry part Sectional view of an example of the photometry unit The figure for demonstrating roughly an example of the electrical constitution of a luminous intensity measuring device Diagram showing an example of measurement results

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Photoluminescent brightness measuring device 102 Photometry part 103 Photoluminescent safety sign board 104 Shaft part 105 Grip part 106 Display part 107 Universal joint part 108 Color material part 109 Light storage part 201 Light-shielding part 202 Light-receiving part 301 Proximity surface 302 Light-shielding elastic body 305 Light-receiving element 403 Signal processing circuit 410 Display 411, 412 Operation buttons

Claims (1)

A photometric unit having a smaller proximity surface than the phosphorescent part of the phosphorescent sign;
A light receiving unit for receiving light from a light receiving surface provided on the proximity surface;
A rubber-like light shielding material that is arranged around the light receiving surface of the proximity surface and shields light incident on the light receiving surface from outside the region facing the light receiving surface of the light storing sign by being in close contact with the light storing sign. An elastic body,
Means for calculating an afterglow luminance of the phosphorescent sign according to a light reception result when the elastic body for light shielding is in close contact with the phosphorescent sign;
A shaft having a grip;
A luminous intensity measuring instrument comprising: a universal joint that connects the photometry unit to an end of the shaft opposite to the grip.

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