JP2008108589A - Light-emitting unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting unit capable of adjusting easily variations in luminance and color tone in individual light-emitting units and correcting these to have an optimal curvature. <P>SOLUTION: The light-emitting unit is provided with a plurality of light-emitting diodes 23, a first switching element 50a to switch on and off current to be supplied to the light-emitting diodes 23, a DMX receiving means 51 to receive an emission intensity signal from a light control table, a first table 60a to show relations between a duty ratio of the first switching element 50a and the emission intensity signal, a first controller 40a which extracts the duty ratio corresponding to the emission intensity signal from the first table 60a and outputs a drive pulse signal to the first switching element 50a, and a first variable resistor 52a capable of inputting a correction information regarding the luminance of the light-emitting diodes 23. The first controller 40a changes the duty ratio extracted from the first table 60a based on the correction information when the correction information is input. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light emitting unit, and more particularly, to a light emitting unit that is laid along a floor or wall surface of a building and that can emit light from the surface.

  An embedded light emitting device that is embedded in a floor surface of a store or a restaurant and emits light from the surface (upper surface) is known. According to this light emitting device, it is possible to produce effects and decoration effects by light, and to give visual interest to customers and the like.

  Moreover, the illuminating device which can be laid on the existing floor surface is proposed so that floor illumination can be implement | achieved easily (for example, patent document 1). A box-shaped casing having an open top surface, a plate-shaped reinforced plastic material disposed in an upper surface opening of the casing, a plate-shaped light diffusing member disposed below, and a light diffusing member It is the light emission unit comprised from the several light emitting diode which irradiates. And it is possible to construct a large-scale lighting system as a whole by arranging a plurality of the light emitting units in the vertical and horizontal alignment. In particular, the light emitting unit is provided with a red light emitting diode, a green light emitting diode, and a blue light emitting diode that emit light of three primary colors R (red), G (green), and B (blue), respectively. By controlling the lighting state and brightness of the light emitting diode, it is possible to emit full color light from the surface of the light emitting unit.

  Furthermore, in the above light emitting unit, a DMX signal is sent from a light control table arranged outside, and the light emission control means provided in the light emitting unit is configured to emit a plurality of lights based on the received DMX signal. Controls energization to the diode. That is, the light emitting diode can be turned on or blinked based on a program stored in the dimming console.

JP 2004-355992 A

  However, in general, light-emitting diodes vary in luminance and color tone depending on manufacturing characteristics and the like. Therefore, in a light-emitting unit including a plurality of such light-emitting diodes, unevenness in luminance and color tone may occur. In particular, in the above light emitting unit, since it is possible to emit full-color light by controlling the luminance of the light emitting diodes of the three primary colors, not only the single color luminance and color tone of each light emitting diode but also the light emitting diodes of different colors can be used. There was also unevenness in the color tone generated in combination. In addition, in the construction of a large-scale lighting system as a whole by arranging a plurality of light emitting units aligned vertically and horizontally, if the luminance and color tone are different between adjacent light emitting units, the change in color tone is emphasized, There was a concern that it would be difficult to fully exhibit the effect of light.

  In addition, in order to use light emitting diodes with uniform characteristics, it is common practice to check the brightness and color tone of individual light emitting diodes, select only light emitting diodes within a predetermined standard, and perform ranking. However, according to this, the labor for quality inspection and quality control is increased, and the manufacturing cost of the light emitting diode is increased. Even if each light emitting diode is individually inspected, the characteristics may change when the light emitting diodes are incorporated into the light emitting unit.

  Therefore, after assembling the light emitting unit, as a method of adjusting the luminance of the light emitting diode, a method of exchanging the resistor connected to the light emitting diode according to the luminance of the light emitting diode, or a variable resistor in series with the light emitting diode is provided. There has been proposed a method of connecting and adjusting the luminance while manually operating the variable resistor. However, the method of exchanging the resistance is not preferable because the burden on the operator is large and fine adjustment is difficult. On the other hand, in the method of adjusting by connecting a variable resistor, if the variable resistor is operated and adjusted while maintaining a predetermined output (for example, maximum output), the current supplied to the light emitting diode at the time of output is adjusted. Can be set to a suitable value, but at other outputs, the current is changed by the variable resistor at the same rate, so when the light emission intensity changes, the brightness and color tone change. There is a risk of unevenness.

  By the way, the viewing angle characteristic with respect to the human luminance becomes insensitive as the luminance increases, and is represented by a curve with respect to the change in luminance. For this reason, in the light emitting unit, in general, γ correction is performed so as to compensate for human viewing angle characteristics. However, when the current supplied to the light emitting diode is changed by the variable resistor as described above, it cannot be corrected to an optimum curve according to the γ characteristic, and as a result, the human visual angle characteristic is compensated. It becomes difficult.

  In view of the above, the present invention makes it possible to easily adjust variations in brightness and color tone of individual light emitting units, and to achieve human visual characteristics over the entire range from the minimum output to the maximum output. It is an object of the present invention to provide a light emitting unit that can be corrected to a suitable curve.

The light emitting unit according to the present invention includes a light emitting unit having a plurality of light emitting diodes,
A switching element for turning on and off a direct current supplied to the light emitting diode;
Receiving means for receiving a light emission intensity signal corresponding to the luminance of the light emitting diode from an external dimming command device;
A table showing the relationship between the duty ratio of the switching element and the emission intensity signal;
When receiving the emission intensity signal by the receiving means, the controller extracts the duty ratio corresponding to the emission intensity signal from the table, and outputs a drive pulse signal having the duty ratio to the switching element;
Correction information input means capable of causing the controller to input correction information related to the luminance of the light emitting diode,
The controller includes a correction unit that changes the duty ratio extracted from the table based on the correction information when the correction information related to the luminance is input by the correction information input unit.

  Here, the “plurality of light emitting diodes” may be composed of only single color light emitting diodes, but three types of light emission capable of emitting light of three primary colors (R (red), G (green), B (blue)). A diode may be provided and a full color display may be performed depending on a combination of light emitting states. In addition, the “switching element” is a device that switches the energization state to the light emitting diode by being turned on / off by a drive pulse signal, and can be exemplified by a transistor. Further, the “light control command device” is not particularly limited, and a light control table that outputs a DMX signal can be mentioned.

  Further, the “correction information input means” may be one that detects the luminance of light emitted from the light emitting means like the luminous intensity detection means and uses the actually measured luminance as correction information. As described above, an operation amount that is manually performed by an operator or the like may be used as the correction information.

  Therefore, according to the light emitting unit of the present invention, the controller receives the light emission intensity signal transmitted from the external dimming command device, and extracts the duty ratio corresponding to the light emission intensity signal from the table. That is, the light emission intensity signal is input, and the duty ratio (on / off control time ratio) of the switching element corresponding thereto is determined. In this case, it is preferable that the table stores data considering γ correction that compensates for human visual characteristics, and according to this, an optimum value corresponding to the γ characteristics inherent to the light-emitting unit is stored. It is possible to match the curve.

  When the duty ratio is determined, the controller outputs a drive pulse signal having the duty ratio to the switching element. Then, the switching element is repeatedly turned on and off at a cycle corresponding to the duty ratio, and supplies a direct current to the light emitting diode during the on time. As a result, the light emitting diode is turned on and has a luminance corresponding to the duty ratio.

  By the way, the luminance or color tone of the light emitting diode may vary depending on the manufacturing characteristics. In this case, although a constant driving pulse signal is output, other light emitting means (or a reference) is used. It may be too bright or too dark compared to the light emitting means). Therefore, in the present invention, correction information input means is provided to enable the controller to input correction information regarding the luminance of the light emitting diode. When the correction information is input, the controller changes the duty ratio extracted from the table based on the correction information, and changes the energization time (switching element on-control time) in the light emitting diode. As described above, according to the present invention, since the duty ratio extracted from the table is individually changed based on the correction information, it is possible to match the optimum curve corresponding to the γ characteristic even after correction.

Further, in the light emitting unit of the present invention, “the correction information input means comprises a variable resistor,
The correction means may be configured to detect a voltage that changes due to the operation of the variable resistor and determine a correction amount of the duty ratio based on the voltage ”.

  According to the light emitting unit of the present invention, a variable resistor is connected to the controller, and an operation amount of the variable resistor, that is, a voltage change amount is recognized by the controller. Based on this voltage, the correction amount (change amount) of the duty ratio is determined. For this reason, the operator can adjust the luminance at a predetermined light emission intensity to the optimum luminance by operating the variable resistor while visually recognizing the luminance of the light emitting means. In addition, since the variable resistor maintains its state even after adjustment, it is possible to always recognize the correction information without electrically storing the input correction information (that is, the adjusted operation amount). become.

Further, in the light emitting unit of the present invention, “the correction means includes a correction table indicating a relationship between the correction amount of the duty ratio and the voltage;
Correction amount extraction means for extracting a correction amount corresponding to the voltage from the correction table;
It is preferable that the controller determines the duty ratio of the drive pulse based on the duty ratio extracted from the table and the correction amount extracted from the correction table.

  According to the light emitting unit of the present invention, in addition to the table indicating the relationship between the duty ratio and the light emission intensity signal, the correction table indicating the relationship between the correction amount of the duty ratio and the voltage (correction information) is provided. The correction amount corresponding to is extracted from the correction table. The duty ratio of the drive pulse is determined based on the duty ratio extracted from the table and the correction amount extracted from the correction table. For this reason, the optimal correction amount corresponding to each duty ratio can be determined without storing complicated calculation processing by storing the optimal correction amount corresponding to the γ characteristic in advance in the correction table. As a result, the addition of control in the controller can be reduced. In the correction table, individual correction amounts suitable for the respective light emission intensities are stored in association with each other. Therefore, once correction information for a predetermined light emission intensity is input, an optimum correction amount for all ranges is obtained. Can be determined individually. For this reason, the adjustment work becomes extremely easy, and the burden on the operator in the adjustment work can be greatly reduced.

  Note that the present invention can also be suitably applied to a light emitting unit that can emit light of three primary colors. In this case, for example, the following configuration can be adopted.

That is, "a light emitting means for emitting a full color light by a combination of respective luminances, including a red light emitting diode that emits red light, a green light emitting diode that emits green light, and a blue light emitting diode that emits blue light;
A first switching element for turning on and off a direct current supplied to the red light emitting diode;
A second switching element for turning on and off a direct current supplied to the green light emitting diode;
A third switching element for turning on and off a direct current supplied to the blue light emitting diode;
Receiving means for receiving a DMX signal from a dimming console arranged outside;
A first table showing a relationship between a first duty ratio of the first switching element and the DMX signal;
A second table showing a relationship between a second duty ratio of the second switching element and the DMX signal;
A third table showing a relationship between a third duty ratio of the third switching element and the DMX signal;
When the DMX signal is received by the receiving means, the first duty ratio corresponding to the DMX signal is extracted from the first table, and a first drive pulse signal having the first duty ratio is extracted from the first switching element. A first controller that outputs to
When the DMX signal is received by the receiving means, the second duty ratio corresponding to the DMX signal is extracted from the second table, and a second drive pulse signal having the second duty ratio is extracted from the second switching element. A second controller that outputs to
When the DMX signal is received by the receiving means, the third duty ratio corresponding to the DMX signal is extracted from the third table, and a third drive pulse signal having the third duty ratio is extracted from the third switching element. A third controller that outputs to
Red correction information input means capable of causing the first controller to input correction information related to the luminance of the red light emitting diode in a state where only the red light emitting diode is lit.
Green correction information input means capable of causing the second controller to input correction information related to the luminance of the green light emitting diode in a state where only the green light emitting diode is lit.
Blue correction information input means capable of causing the third controller to input correction information related to the luminance of the blue light emitting diode in a state where only the blue light emitting diode is lit.
The first controller includes a first correction unit configured to change the first duty ratio extracted from the first table based on the correction information when correction information relating to luminance is input by the red correction information input unit. Prepared,
The second controller has second correction means for changing the second duty ratio extracted from the second table based on the correction information when correction information relating to luminance is input by the green correction information input means. Prepared,
The third controller has third correction means for changing the second duty ratio extracted from the third table based on the correction information when correction information relating to luminance is input by the blue correction information input means. It's something to prepare.

  According to this, the correction amount in each color light emitting diode is individually set. For this reason, even in a full-color display generated by combining these light emitting diodes, variations in luminance or color tone in the light emitting means can be eliminated.

  As described above, according to the light emitting unit of the present invention, since the duty ratio of the drive pulse signal is changed by inputting correction information to the controller, it is possible to easily adjust variations in luminance and color tone. Further, since the duty ratios extracted from the table are individually changed based on the correction information, it is possible to compensate for the human visual characteristics by making them match the optimal curve corresponding to the γ characteristics even after the change.

  Hereinafter, a light emitting unit according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 are a perspective view, a side view, and a bottom view showing a floor lighting system constructed by combining a plurality of light emitting units, and FIG. 4 is an exploded perspective view showing a configuration of the light emitting units. 5 is a cross-sectional view showing the configuration of the main part of the light emitting unit, FIG. 6 is an explanatory view showing the arrangement of the light emitting diodes, FIG. 7 is a circuit diagram showing the control device, and FIG. 8 is a control device. FIG. 9 is a graph showing a relationship between an input signal and an output signal for the controller.

  The floor lighting system 2 of this example is constructed by combining a plurality of light emitting units 1 on a plane as shown in FIGS. 1 to 3, and is laid on a floor surface U of a building, for example. In addition, in FIG. 1, although what was constructed | assembled from nine light emitting units 1 is illustrated, the number of the light emitting units 1 which can be combined is not restrict | limited, The width and shape of the floor surface U used as an attachment surface It is possible to set arbitrarily according to the above. In addition, the light emitting unit 1 of the present example has a square shape with a side length of 500 mm, and a rectangular or square floor whose side length is an integral multiple of 500 mm by combining a plurality of light emitting units 1. The lighting system 2 can be constructed.

  Further, these light emitting units 1 are connected via a base metal fitting 3. The base metal fitting 3 is attached to the four corners 15 of the light emitting unit 1 to connect adjacent light emitting units 1 to each other and to form a gap K between the casing 4 of the light emitting unit 1 and the floor U. It is functioning as well. Further, the height of the base metal fitting 3 can be adjusted in the vertical direction, and it is possible to prevent the light emitting unit 1 from rattling and to be stably installed.

  As shown in FIGS. 4 and 5, a transparent glass plate 6 and a transparent resin diffusion plate are arranged in order from the top as a configuration for radiating light in a box-shaped casing 4 having an opening 5 formed on the upper surface. 7, the light guide plate 8, and the light diffusing and reflecting member 9 are laminated, and a light emitting means 12 including a plurality of light emitting diodes 11 attached to the substrate 10 is provided relative to one side surface of the light guide plate 8. . In addition, you may make it provide the light emission means 12 facing each side surface (namely, side surface of four sides) of the light-guide plate 8, as needed. A plate-like spacer 13 is provided between the inner bottom surface of the casing 4 and the light diffusing and reflecting member 9 in order to secure an accommodation space for the substrate 10 of the light emitting means 12. A circuit box 14 (see FIGS. 2 and 3) is attached.

  The above configuration will be specifically described. The casing 4 is a thin housing formed of, for example, a metal plate material, and has a substantially square shape in plan view. As shown in FIGS. 1 and 4, the four corners 15 of the casing 4 are notched in a triangular shape, and when the four light emitting units 1 are combined in a square shape, a rectangular through hole is formed by the notches. It has come to be. In addition, the shape of the cut four corners 15 is not uniform in the vertical direction of the casing 4, and is cut so that the lower side protrudes outward from the upper side. That is, the protrusion 16 is formed on the lower side of the four corners 15.

  As shown in FIGS. 4 and 5, the transparent glass plate 6 is made of a colorless and transparent laminated glass having a thickness of about 8 mm, and a plurality of projections 19 made of lumps of fine glass are formed on the surface thereof. Is formed. The protrusion 19 prevents a pedestrian or the like from slipping by generating an appropriate resistance on the surface of the glass. Although the magnitude | size of the protrusion 19 is not specifically limited, A slip can be prevented effectively by setting a diameter to about 0.5 mm-3 mm.

  The transparent resin diffusing plate 7 is a generally well-known plate-like member that diffuses light passing therethrough to make it difficult to visually recognize the shape of the member positioned below and to emit light in a planar shape. .

  The light guide plate 8 is a plate material formed of a transparent resin (for example, an acrylic plate), and the size of the surface thereof is substantially equal to that of the transparent glass plate 6. The thickness of the light guide plate 8 is not particularly limited, but is preferably about 10 mm. Further, as shown in FIG. 5, dot-like fluorescent white bodies 21 are disposed on the back surface of the light guide plate 8 at a predetermined interval. The fluorescent white body 21 is made of, for example, a white fluorescent paint, and emits fluorescence having a color corresponding to the wavelength of light emitted from the light emitting diode 11. The size of each dot in the fluorescent white body 21 and the distance between the dots are not particularly limited. However, when the diameter and the distance of the dod are both set to 1 mm to 3 mm, the highest luminance may be obtained. It has been confirmed.

  The light diffusion reflection member 9 is a white plate-like or film-like member disposed on the lower surface side of the light guide plate 8 and diffuses and reflects the light emitted from the light emitting diode 11. That is, when light that has passed through a portion where the fluorescent white body 21 is not provided or light that has passed through the fluorescent white body 21 irradiates the light diffusion reflection member 9, the light diffusion reflection member 9 diffuses the light.

  The light emitting diode 11 emits visible light by applying a forward bias voltage to a semiconductor PN junction. In this example, as shown in FIG. 6, three types of light emitting diodes having different emission colors are used. 11, that is, a red light emitting diode 23 that emits red light, a green light emitting diode 24 that emits green light, and a blue light emitting diode 25 that emits blue light. These light emitting diodes 11 are arranged along the side surface of the light guide plate 8.

  In particular, the light-emitting diode array 26 in which the red light-emitting diodes 23, the green light-emitting diodes 24, and the blue light-emitting diodes 25 are sequentially arranged so that the adjacent light-emitting diodes 11 are different from each other is formed in the thickness direction of the light guide plate 8. Are stacked. More specifically, the light emitting diodes 11 in the stacking direction do not overlap each other, and the light emitting diodes 11 facing each other in the oblique direction are different from each other (for example, a green light emitting diode is disposed obliquely below the red light emitting diode 23). 24 and the blue light emitting diode 25 are stacked). For this reason, the light emitting diodes 11 of the three colors are evenly arranged with respect to the side surface of the light guide plate 8, and the interval between the light emitting diodes 11 of the same color is shorter than those arranged in a line. That is, in FIG. 6, the interval between the arrows is shorter than the interval between the arrows.

  As shown in FIG. 3, the electric circuit box 14 includes a control device 34 (see FIGS. 7 and 8), a power supply circuit (not shown), and two power supply terminals (first power supply terminal 28) connected to the power supply circuit. And a second power supply terminal 29) and two signal terminals (first signal terminal 30 and second signal terminal 31) connected to the control device 34 are incorporated. Here, the first power supply terminal 28 is connected to the light emitting means 12, the control device 34, and the like via an AC / DC converter 32 (see FIG. 7), a power switch and the like (not shown). When the power cord 35 is connected to the first power terminal 28, the plug 35a of the power cord 35 is connected to a commercial power outlet, thereby supplying the operating power to the light emitting means 12, the control device 34, and the like. Is possible. On the other hand, the second power supply terminal 29 is electrically connected to the first power supply terminal 28, and the second power supply terminal 29 is connected to the first power supply terminal 28 of another light emitting unit 1 laid adjacently via the power transmission cord 36. By connecting, it becomes possible to supply power for operation to the other light emitting units 1. That is, since the plurality of light emitting units 1 are connected in series via the power transmission cord 36, if the plug 35a of the power cord 35 connected to one light emitting unit 1 is connected to a commercial power outlet (not shown), Power for operation can be sequentially supplied to all the light emitting units 1. In the other light emitting units 1 connected via the power transmission cord 36, the power transmission cord 36 is connected to the first power supply terminal 28. That is, when the other light emitting units 1 are mainly viewed, the power transmission cord 36 functions as a power cord, and commercial power is supplied via the power transmission cord 36.

  On the other hand, when the reception cord 37 is connected to the first signal terminal 30, it is possible to receive the DMX signal from the light control console 38 by connecting the other end of the reception code 37 to the light control console 38. Become. The second signal terminal 31 is electrically connected to the first signal terminal 30 and is connected to the first signal terminal 30 of another light emitting unit 1 laid adjacent to the second signal terminal 31 via a transmission cord 39. By doing so, it becomes possible to transmit the DMX signal to the other light emitting units 1. That is, since the plurality of light emitting units 1 are connected in series via the transmission cord 39, when the floor lighting system 2 is constructed from the plurality of light emitting units 1, the reception code 37 connected to one light emitting unit 1 is adjusted. If connected to the optical table 38, DMX signals can be supplied to other light emitting units 1 in order. The “DMX signal” is a globally standardized high-speed digital signal called a “DMX512 signal” and complies with the dimming signal standard. The DMX512 signal has 512 channels, and can transmit up to 512 data serially, and can control many light emitting units 1 individually and simultaneously. Although not shown, the light control console 38 is provided with many operation levers and operation buttons, and data transmitted by the DMX512 signal can be set by these operation units. That is, in the dimming console 38, the lighting pattern is stored in advance as a program, so that the dimming control signal and the operation control signal according to the program are transmitted in a serial manner. Here, the dimming table 38 corresponds to the dimming command device of the present invention.

  As shown in FIG. 2, a gap K is formed between the casing 4 and the floor U by the base metal fitting 3, and the power cord 35, the power transmission cord 36, the reception cord 37, and the transmission cord 39 are The wiring is made through the gap K. That is, it is possible to perform wiring without exposing these cords 35, 36, 37, and 39.

  Next, the circuit configuration and functional configuration of the control device 4 will be described with reference to FIGS. As shown in FIG. 7, the control device 34 controls the lighting states of the three types of light emitting diodes 11 (the red light emitting diode 23, the green light emitting diode 24, and the blue light emitting diode 25) included in the light emitting means 12 by pulse driving signals. A first controller 40a, a second controller 40b, and a third controller 40c. Each of the controllers 40a, 40b, and 40c is composed of a CPU, and has main storage means, calculation means, control means, and the like. The DMX receiving means 51 is connected to the input port of the first controller 40a, and the energization amount (energization time) to the red light emitting diode 23 is controlled based on the received DMX signal. Further, a dip switch 43 for allocating each light emitting unit 1 is connected to the input port of the first controller 40a, and the first controller 40a performs control according to its own address set by the dip switch 43. I do. Here, the DMX receiving means 51 corresponds to the receiving means of the present invention.

  A first variable resistor 52a for adjusting the luminance of the red light emitting diode 23 is connected to the input port of the first controller 40a. The first variable resistor 52a constitutes a volume, and a voltage that changes due to an artificial operation is recognized by the first controller 40a. A method for adjusting the luminance will be described later. Here, the first variable resistor 52a corresponds to the correction information input means and the red correction information input means of the present invention.

  On the other hand, a first switching element 50a for controlling energization to the red light emitting diode 23 is connected to the output port of the first controller 40a. The first switching element 50a is repeatedly turned on and off by a pulse drive signal output from the first controller 40a, and is configured to supply a direct current to the red light emitting diode 23 in the on control state.

  The second controller 40b is the same as the first controller 40a, is connected to the DMX receiving means 51, and controls energization to the green light emitting diode 24 based on the received DMX signal. A second variable resistor 52b for adjusting the luminance of the green light emitting diode 24 is connected. Further, a second switching element 50b for controlling energization to the green light emitting diode 24 is connected to the output port of the second controller 40b, and the second switching element 50b is output from the second controller 40b. ON / OFF is repeated by the pulse drive signal, and a direct current is supplied to the green light emitting diode 24 in the ON control state. Here, the second variable resistor 52b corresponds to the correction information input means and the green correction information input means of the present invention.

  Similarly, the third controller 40c is connected to the DMX receiving means 51 and controls energization to the blue light emitting diode 25 based on the received DMX signal. A third variable resistor 52c for adjusting the luminance of the blue light emitting diode 25 is connected. Further, a third switching element 50c for controlling energization to the blue light emitting diode 25 is connected to the output port of the third controller 40c, and the third switching element 50c is output from the third controller 40c. ON / OFF is repeated by the pulse drive signal, and a direct current is supplied to the blue light emitting diode 25 in the ON control state. Here, the third variable resistor 52c corresponds to the correction information input means and the blue correction information input means of the present invention.

  By the way, as shown in FIG. 8, the 1st controller 40a is provided with the 1st table 60a and the 1st duty determination means 61a as a functional structure. The first table 60a shows the relationship between the DMX signal received by the DMX receiving means 51 (that is, a signal indicating the light emission intensity) and the duty ratio (time ratio between on control and off control) of the first switching element 50a. is there. Specifically, the relationship between the input and the output when the DMX signal is input data and the duty ratio is output data is not a straight line but a γ-corrected curve as shown by the solid line in FIG. . In other words, since the visual characteristics with respect to human brightness become insensitive as the brightness increases, in order to compensate for human visual characteristics, the duty ratio for each light emission intensity is set in advance so as to obtain an optimum curve according to the γ characteristics. It is stored in the first table 60a.

  When the DMX signal is received by the DMX receiving means 51, the first duty determining means 61a extracts the duty ratio corresponding to the DMX signal (light emission intensity signal) from the first table 60a, thereby determining the duty ratio of the pulse drive signal. To do.

  The first controller 40a is provided with a first correction table 63a and a first correction means 62a as correction means. The first correction table 63a shows the relationship between the voltage that changes according to the operation of the first variable resistor 52a, that is, the voltage recognized by the first controller 40a, and the correction amount of the duty ratio. Is larger than the reference value, the larger the difference from the reference value, the larger the positive correction amount.On the other hand, when the voltage value is smaller than the reference value, the larger the difference from the reference value, the more negative The correction amount is set to be large. That is, if the knob (not shown) of the first variable resistor 52a is rotated in a certain direction, the correction amount is determined so that the duty ratio is increased, and conversely, the knob of the first variable resistor 52a is rotated in the opposite direction. In this case, the correction amount is determined so that the duty ratio becomes small. Further, the correction amount is set so that the output after correction becomes an optimal curve corresponding to the γ characteristic, as shown by the dotted line in FIG.

  The first correction amount extraction unit 62a extracts a correction amount corresponding to the detected voltage from the first correction table 63a, and is configured to send the extracted correction amount to the first duty determination unit 61a. Yes. For this reason, the first duty determination means 61a determines the duty ratio in the drive pulse signal based on the duty ratio extracted from the first table 60a and the correction amount extracted from the first correction table 63a. Then, the first output means 64a provided in the first controller 40a generates a drive pulse signal having the determined duty ratio (or the corrected duty ratio if there is a correction), and supplies it to the first switching element 50a. Output. Then, the first switching element 50a is on / off controlled at a predetermined cycle according to the duty ratio, and the red light emitting diode 23 can be lit at a predetermined brightness.

  Further, in the second controller 40b, as in the first controller 40a, as a functional configuration, the second table 60b, the second duty determination means 61b, the second correction means 62b, the second correction table 63b, and the second output means. 64b is provided. Further, the third controller 40c is provided with a third table 60c, a third duty determination means 61c, a third correction means 62c, a third correction table 63c, and a third output means 64c. That is, the duty ratio is determined individually for each of the red light emitting diode 23, the green light emitting diode 24, and the blue light emitting diode 25, and the correction amount is individually set. In addition, since each structure of the 2nd controller 40b and the 3rd controller 40c is the same as that of the functional structure in the 1st controller 40a, detailed description is abbreviate | omitted here.

  Next, the light emission operation in the light emitting unit 1 will be described. As shown in FIG. 5, the light emitted from the light emitting means 12 travels inside the transparent light guide plate 8. Since a plurality of fluorescent white bodies 21 are provided on the back surface of the light guide plate 8, when a part of the light irradiates the fluorescent white body 21, the fluorescent white body 21 changes its wavelength in response to a stimulus of a predetermined wavelength. It emits fluorescence of an appropriate color. Thereby, the brightness | luminance of the light-guide plate 8 increases. Further, the light that has passed through the portion where the fluorescent white body 21 is not provided or the light that has passed through the fluorescent white body 21 irradiates the light diffusing and reflecting member 9 disposed below the light guide plate 8. Then, since light is reflected and diffused around by the light diffusing and reflecting member 9, a part of the light is radiated from the surface of the light guide plate 8.

  The light emitted to the surface of the light guide plate 8 passes through the transparent resin diffusion plate 7 and the transparent glass plate 6 and is emitted to the outside of the casing 4. At this time, the transparent resin diffusing plate 7 diffuses the light passing therethrough, so that the outline of the built-in object seen from the surface side of the transparent glass plate 6 is obscured, and the light guide plate 8 is illuminated in a planar shape. it can. That is, the light guide plate 8 functions as a surface light source, so that the substantially entire surface of the transparent glass plate 6 can be illuminated uniformly.

  Further, the light emitting means 12 is provided with a red light emitting diode 23, a green light emitting diode 24, and a blue light emitting diode 25 each emitting light of three primary colors, and the lighting state is pulse-driven controlled for each light emitting color. Full-color light generated by combining these colors as well as red, green, and blue light can be emitted from the transparent glass plate 6. In particular, each of the light emitting diodes 11 is stacked in two rows, and the three color light emitting diodes 11 are arranged evenly with respect to the side surface of the light guide plate 8, so that any combination of light emission is possible. However, it is possible to suppress the difference between light and dark and minimize color unevenness.

  Next, a method for adjusting luminance and color tone in the light emitting means 12 will be described. First, when an adjustment switch (not shown) provided on the dimming console 38 is turned on, a DMX signal is output from the dimming console 38, the green light emitting diode 24 and the blue light emitting diode 25 are turned off, and the red light emitting diode 23 is turned off. A command is sent to turn on only at maximum output. The first controller 40a receives the DMX signal and extracts the duty ratio corresponding to the DMX signal from the first table 60a. That is, the DMX signal is input, the duty ratio of the first switching element 50a corresponding to the DMX signal is determined, and a pulse signal having the duty ratio is output to the first switching element 50a. Then, a current corresponding to the duty ratio is supplied to the red light emitting diode 23, and the red light emitting diode 23 is turned on.

  Therefore, the operator visually recognizes the brightness of the red light emitting diode 23, more precisely, the red light emitted through the glass plate 6 of the light emitting unit 1, and whether or not the brightness is the same as the brightness of the reference product. When the target light emitting unit 1 is arranged next to the reference light emitting unit, it is visually confirmed whether or not the luminance and color tone are the same.

  When the luminance or the color tone does not coincide with the reference one, the first variable resistor 52a is artificially operated. Then, the operation amount of the first variable resistor 52a, that is, the voltage change amount is recognized by the first controller 40a, and the duty ratio correction amount (change amount) based on this voltage is extracted from the first correction table 63a. Is done. Thereafter, the duty ratio in the drive pulse signal is determined based on the duty ratio extracted from the first table 60a and the correction amount extracted from the first correction table 63a. It is output to the switching element 50a. In this manner, the luminance of the red light emitting diode 23 at the maximum output can be matched with the luminance in the reference light emitting unit.

  Note that, as indicated by the dotted line in FIG. 9, the corrected output data (corresponding to the duty ratio) is determined based on a predetermined curve, so that the correction amount for the maximum output is once determined as described above. If it is done, it becomes possible to determine the optimum correction amount over the entire emission intensity.

  After the adjustment of the luminance in the red light emitting diode 23 is completed, when the adjustment switch of the dimming console 38 is turned on again, the red light emitting diode 23 and the blue light emitting diode 25 are turned off and only the green light emitting diode 24 is maximized. A command is sent to turn on the output. Thereby, it becomes possible to adjust the brightness | luminance of the green light emitting diode 24 by the method similar to the case of the red light emitting diode 23. FIG. After that, when the adjustment switch of the dimming console 38 is turned on again, a command is sent to turn off the red light emitting diode 23 and the green light emitting diode 24 and turn on only the blue light emitting diode 25 at the maximum output. The brightness of the diode 25 can be adjusted.

  Further, after the luminance of the blue light emitting diode 25 is adjusted, when the adjustment switch of the dimming console 38 is turned on, the maximum is obtained for all the light emitting diodes (red light emitting diode 23, green light emitting diode 24, blue light emitting diode 25). A command is sent to turn on the output. Thereby, all the light emitting diodes are turned on, and white light is emitted by the combination of the three primary colors. For this reason, the operator can check the luminance and color tone with respect to white light.

  As described above, in the light emitting unit 1 of this example, the correction information (voltage) related to the luminance of each of the light emitting diodes 23, 24, and 25 is used as the first variable resistor 52a, the second variable resistor 52b, and the third variable resistor. Since the duty ratios that are input using the device 52c and extracted from the tables 60a, 60b, and 60c are individually corrected based on the correction information, variations in luminance and color tone of the respective light emitting diodes 23, 24, and 25 are achieved. Can be easily adjusted. In addition, since the duty ratios extracted from the tables 60a, 60b, and 60c are individually corrected based on the correction information, even after correction, the duty ratio can be matched with an optimal curve according to the γ characteristics, and human visual characteristics Can be compensated. In particular, since the brightness of the light-emitting diodes 23, 24, and 25 is adjusted using the variable resistors 52a, 52b, and 52c while visually recognizing, it can be configured relatively inexpensively and matches the human visual characteristics. Adjustment is possible. In addition, since the variable resistors 52a, 52b, and 52c maintain their states after adjustment, the correction information can be always recognized without electrically storing the adjusted operation amount.

  Furthermore, in the light emitting unit 1 of this example, correction tables 63a, 63b, and 63c that indicate the relationship between the correction amount of the duty ratio and the voltage are provided separately from the tables 60a, 60b, and 60c, and correspond to the voltage. The correction amount is extracted from the correction tables 63a, 63b, 63c. The duty ratio of the drive pulse is determined based on the duty ratio extracted from the tables 60a, 60b, and 60c and the correction amount extracted from the correction tables 63a, 63b, and 63c. For this reason, it is possible to easily determine the optimum correction amount corresponding to each duty ratio without performing complicated arithmetic processing, and to reduce the addition of control in the controllers 40a, 40b, and 40c. Is possible. Further, in the correction tables 63a, 63b, and 63c, individual correction amounts suitable for the respective light emission intensities are stored in association with each other. Therefore, once correction information for a predetermined light emission intensity is input, all the light emission intensities are obtained. Accordingly, it is possible to individually determine the optimum correction amount. For this reason, the adjustment work becomes extremely easy, and the burden on the operator in the adjustment work can be greatly reduced.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  For example, in the above embodiment, the case where the light emitting unit 1 is disposed on a horizontal plane, that is, the case where the light emitting unit 1 is laid along the floor surface U is illustrated, but the light emitting unit 1 is arranged so that the transparent glass plate 6 is in front. It can also be used upright. That is, the light emitting unit 1 may be attached to a window or wall surface of a building, and the window or wall may be rendered with light. In addition, when using in this way, since it is not necessary to consider resistance, the protrusion 19 becomes unnecessary.

  Moreover, in the said embodiment, although what radiates | emits light from the whole surface of the see-through | transparent glass plate 6 was shown, the dial which has the through-hole on which the character etc. were engraved, for example was provided under the see-through | pervious glass plate 6, You may make it radiate | emit light only from the part of a character. Alternatively, on the contrary, the character portion may be opaque and the background portion around the character may be translucent. In this way, characters such as the venue name and the entrance / exit can be visually recognized, and in addition to the production effect, pedestrians and the like can be guided easily and smoothly.

  Furthermore, in the above-described embodiment, the correction tables 63a, 63b, and 63c indicating the relationship between the correction amount of the duty ratio and the voltage are provided, and the correction amount is determined based on the correction tables 63a, 63b, and 63c and the detected voltage. However, the respective correction amounts may be calculated based on pre-stored arithmetic expressions. Further, for example, the correction ratio determined at the time of maximum output, that is, the change rate of the corrected duty ratio with respect to the duty ratio before correction is calculated, and the change rate is extracted from each table 60a, 60b, 60c. Each correction amount may be obtained by multiplying the duty ratio.

It is a perspective view which shows the floor lighting system constructed | assembled using the light emission unit which is one Embodiment of this invention. It is a side view which shows the structure of a floor lighting system. It is a bottom view which shows the structure of a floor lighting system. It is a disassembled perspective view which shows the structure of the principal part in a light emission unit. It is sectional drawing which shows the internal structure of a light emission unit. It is explanatory drawing which shows arrangement | positioning of the light emitting diode in a light emission unit. It is a circuit diagram which shows the structure of the electric circuit with which the control apparatus of the light emission unit was equipped. It is a block diagram which shows the functional structure in the control apparatus of a light emission unit. It is a graph which shows the relationship between a DMX signal (input signal) and an output signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light emitting unit 11 Light emitting diode 12 Light emitting means 23 Red light emitting diode (light emitting diode)
24 Green light emitting diode (light emitting diode)
25 Blue light emitting diode (light emitting diode)
38 Light control table (light control command device)
40a First controller (controller)
40b Second controller (controller)
40c Third controller (controller)
50a First switching element (switching element)
50b Second switching element (switching element)
50c Third switching element (switching element)
51 DMX receiving means (receiving means)
52a First variable resistor (variable resistor, correction information input means, red correction information input means)
52b Second variable resistor (variable resistor, correction information input means, green correction information input means)
52c Third variable resistor (variable resistor, correction information input means, blue correction information input means)
60a First table (table)
60b Second table (table)
60c Third table (table)
62a First correction amount extraction means (correction means)
62b Second correction amount extraction means (correction means)
62c Third correction amount extraction means (correction means)
63a First correction table (correction table, correction means)
63b Second correction table (correction table, correction means)
63c Third correction table (correction table, correction means)

Claims (3)

A light emitting means having a plurality of light emitting diodes;
A switching element for turning on and off a direct current supplied to the light emitting diode;
Receiving means for receiving a light emission intensity signal corresponding to the luminance of the light emitting diode from an external dimming command device;
A table showing the relationship between the duty ratio of the switching element and the emission intensity signal;
When receiving the emission intensity signal by the receiving means, the controller extracts the duty ratio corresponding to the emission intensity signal from the table, and outputs a drive pulse signal having the duty ratio to the switching element;
Correction information input means capable of causing the controller to input correction information related to the luminance of the light emitting diode,
The light emitting unit characterized in that the controller includes a correction unit that changes the duty ratio extracted from the table based on the correction information when the correction information regarding the luminance is input by the correction information input unit. . The correction information input means is composed of a variable resistor,
The light emitting unit according to claim 1, wherein the correction unit detects a voltage that is changed by operating the variable resistor, and determines a correction amount of the duty ratio based on the voltage. The correction means includes a correction table indicating a relationship between the correction amount of the duty ratio and the voltage;
Correction amount extraction means for extracting a correction amount corresponding to the voltage from the correction table;
The light emitting unit according to claim 2, wherein the controller determines a duty ratio of the drive pulse based on the duty ratio extracted from the table and a correction amount extracted from the correction table. .

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