JP2008098108A - Lighting control method, light source, and lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting control method in which accuracy of illumination correction is improved by nearly making coincide an actual luminous flux deterioration and characteristics of luminous flux maintenance factor, to provide a light source, and to provide a lighting apparatus. <P>SOLUTION: The illumination correction device 14 controls electric power to be supplied to a light source based on the luminous flux maintenance factor of a fluorescent lamp La so as to suppress deterioration of luminous flux accompanying the elapse of lighting time of the fluorescent lamp La as the light source, and the luminous flux maintenance factor is calculated corresponding to the lighting time of the fluorescent lamp La and input power of the fluorescent lamp La in the lighting time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting control method, a light source, and a lighting fixture.

The luminous flux of a light source such as a discharge lamp, incandescent light bulb, or LED element used in a lighting fixture decreases with the lighting time as shown in FIG. 26 (a), and the lamp or light source equipped with the light source passes with time. Since the amount of light also decreases due to contamination, the illuminance correction is performed in order to suppress such a decrease in the amount of light accompanying the passage of lighting time. Here, the decrease in the luminous flux of the light source is caused by the deterioration of the phosphor in the case of a fluorescent lamp. The illuminance correction basically corrects the decrease in luminous flux as the lighting time of the light source elapses.The light source is dimmed immediately after the light source is replaced, and the lighting time of the light source elapses. Accordingly, the power supplied to the light source is controlled so that the light source approaches the rated lighting. That is, as shown in FIG. 26B, the input power of the light source is increased as the lighting time of the light source elapses. Therefore, while the luminous flux of the light source decreases as the lighting time elapses, the light output of the light source is kept substantially constant by increasing the input power of the light source as the lighting time elapses. (For example, see Patent Document 1)
JP 2001-15276 A (paragraph number [0022], FIG. 2)

  A ratio indicating how much of the initial value is maintained with the elapsed time as shown in FIG. 26A is referred to as a luminous flux maintenance factor. Conventionally, the luminous flux maintenance factor is calculated with a constant input power to the light source. For example, when a 32 W fluorescent lamp is used as the light source, the input power to the fluorescent lamp is kept constant at 32 W by simulation or experiment. Calculated. However, the power actually supplied to the light source increases as the lighting time elapses for illuminance correction, whereas the conventional luminous flux maintenance factor curve Yo shown in FIG. Therefore, the characteristics do not correspond to the change of the input power, and the actual light beam decline does not match the characteristics of the light flux maintenance factor.

  Therefore, when the illuminance correction is performed using the conventional luminous flux maintenance curve Yo, the light source is controlled to be turned on based on a luminous flux maintenance factor different from the actual luminous flux decline, so that the light output of the light source becomes substantially constant. It was not corrected, and the accuracy of illuminance correction was not good.

  The present invention has been made in view of the above-mentioned reasons, and the object thereof is to substantially match the actual light beam degradation and the characteristics of the light beam maintenance rate, and to improve the accuracy of illuminance correction, the light source, and It is to provide a luminaire.

  According to the first aspect of the present invention, the power supplied to the light source is controlled based on the luminous flux maintenance factor of the light source so as to suppress the reduction of the luminous flux with the passage of the lighting time of the light source. It is calculated according to the input power of the light source during the lighting time.

  According to the present invention, in the illumination control method, the luminous flux maintenance factor is in line with the actual input power of the light source, and therefore substantially matches the actual luminous flux decline, and is supplied to the light source based on this luminous flux maintenance factor. Since the power is controlled, the light flux output from the light source is controlled to be substantially constant regardless of the passage of lighting time and the change in input power with the passage of lighting time, thereby improving the accuracy of illuminance correction.

  According to a second aspect of the present invention, in the first aspect, the luminous flux maintenance factor is calculated in advance for a predetermined period, correction data based on the calculated luminous flux maintenance factor is stored in a storage unit, and the stored correction data is stored in the stored correction data. Based on this, the power supplied to the light source is controlled.

  According to the present invention, it is not necessary to provide a process for calculating the luminous flux maintenance factor when correcting illuminance, and lighting control of the light source can be simplified.

  According to a third aspect of the present invention, in the first aspect, the luminous flux maintenance factor after the predetermined time is sequentially calculated according to the lighting time at the predetermined time and the input power of the light source, and the light source is based on the calculated luminous flux maintenance factor. It controls the power supplied to

  According to this invention, the illumination intensity correction according to the use condition of a lighting fixture can be performed.

  According to a fourth aspect of the present invention, lighting control is performed using the illumination control method according to any one of the first to third aspects.

  According to the present invention, in the light source, the luminous flux maintenance factor is in line with the actual input power of the light source, and therefore substantially matches the actual luminous flux decline, and the power supplied to the light source based on this luminous flux maintenance factor. Therefore, the light flux output from the light source is controlled to be substantially constant regardless of the passage of lighting time and the change in input power with the passage of lighting time, thereby improving the accuracy of illuminance correction.

  The invention of claim 5 includes a light source, a lighting device that supplies power to the light source, a lighting time timer that counts a power feeding time to the lighting device as a lighting time of the light source, a lighting time of the light source, and a light source at the lighting time. And an illuminance correction device for instructing the lighting device to supply power to the light source so as to suppress a decrease in the luminous flux with the lapse of the lighting time of the light source based on the luminous flux maintenance factor calculated according to the input power. Features.

  According to this invention, in the luminaire, the luminous flux maintenance factor is in line with the actual input power of the light source, and therefore substantially matches the actual luminous flux decline, and the power supplied to the light source based on this luminous flux maintenance factor Therefore, the light flux output from the light source is controlled to be substantially constant regardless of the passage of lighting time and the change in input power with the passage of lighting time, and the accuracy of illuminance correction is improved.

  As described above, according to the present invention, there is an effect that the accuracy of the illuminance correction can be improved by making the actual light beam decline substantially coincide with the characteristics of the light beam maintenance factor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As illustrated in FIG. 1, the lighting fixture 1 in the present embodiment includes a lighting unit 10 including a lighting device 11, a lighting time detection unit 12, a lighting time timer 13, an illuminance correction device 14, and a correction data storage unit 15, and a light source. The fluorescent lamp La is lit by the output of the lighting device 11 capable of dimming control.

  The lighting time detection unit 12 is provided between a power source AC such as a commercial power supply and the lighting device 11, and detects whether the lighting device 11 is energized. The lighting time timer 13 is a lighting time detection unit. 12 counts the energization period detected. That is, the lighting period of the fluorescent lamp La is counted by the lighting time timer 13 by regarding the energization period as the lighting period of the fluorescent lamp La.

  By the way, the luminous flux of the lamp decreases as the lighting time elapses, and the amount of light also decreases when the lamp or the lamp equipped with the lamp becomes dirty as time elapses. The illumination fixture 1 is provided with an illuminance correction device 14 in order to suppress a decrease in the amount of light accompanying the. Here, the decrease in the luminous flux of the fluorescent lamp La is caused by the deterioration of the phosphor. The illuminance correction device 14 is basically configured to correct a decrease in luminous flux with the passage of the lighting time of the fluorescent lamp La, and the fluorescent lamp La is provided immediately after the replacement of the fluorescent lamp La. It is turned on at the output, and the power supplied to the fluorescent lamp La through the lighting device 11 is increased as the lighting time of the fluorescent lamp La elapses. That is, as the lighting time of the fluorescent lamp La elapses, the output of the lighting device 11 is increased. Therefore, while the luminous flux of the fluorescent lamp La decreases as the lighting time elapses, the supply power to the fluorescent lamp La (the input power of the fluorescent lamp La) increases as the lighting time elapses. The light output of the fluorescent lamp La can be kept substantially constant.

  Hereinafter, the operation of the illuminance correction device 14 of the present embodiment will be described.

  The luminous flux of the fluorescent lamp La decreases as the lighting time elapses, and the ratio indicating the degree of the luminous flux reduction maintained at the initial value with the elapsed time is referred to as a luminous flux maintenance factor. Then, a change in luminous flux maintenance factor is obtained for each input power when an FHF32 (high-frequency lighting dedicated type, straight tube type, rated lamp power 32 W) is used for the fluorescent lamp, and FIG. 2 shows the fluorescent lamp (FHF32). The luminous flux maintenance factor curves obtained by experiments with input powers of 32 W, 45 W, and 63 W are indicated by Y32e, Y45e, and Y63e. The larger the input power, the greater the degree of decrease in the luminous flux maintenance factor with the elapse of lighting time. . That is, it can be seen that the luminous flux maintenance factor of the fluorescent lamp depends on the input power.

  From the analysis by the Lehmann equation (J. Electrochem. Soc .: SOLID-STATE SCIENCE AND TECHNOLOGY 130, No. 2 (1983), pages 426-431, Willi Lehmann) shown in [Equation 1], FIG. As shown in Equation 2, the lifetime constant τ of the fluorescent lamp and the input power p of the fluorescent lamp are recognized to have a substantially correlation, and as the input power p of the fluorescent lamp increases, the lifetime constant τ of the fluorescent lamp becomes Shorter.

Here, I is the luminous intensity (ratio per unit solid angle of the light flux from the light source in all directions), t is the lighting time, and τ is the lifetime constant of the fluorescent lamp.

  Next, in FIG. 4, FHF32 is used as the fluorescent lamp, and the respective luminous flux maintenance factor curves Y32s, Y45s, Y50s, and Y60s when the input power of the fluorescent lamp (FHF32) is 32 W, 45 W, 50 W, and 60 W are obtained by simulation. The lower the luminous flux maintenance factor with the elapse of the lighting time, the greater the input power. That is, even with the same fluorescent lamp, the luminous flux maintenance factor curve varies depending on the input power, and the lower the input power, the smaller the degree of decrease in the luminous flux maintenance factor.

  Conventionally, when the FHF 32 is used for the fluorescent lamp, the input power of the fluorescent lamp is increased with the passage of lighting time based on the luminous flux maintenance factor Y32s when the input power is 32 W. However, the power actually supplied to the fluorescent lamp increases as the lighting time elapses for illuminance correction, whereas the luminous flux maintenance factor Y32s is a characteristic when the input power is kept constant at 32 W. The conventional luminous flux maintenance factor curve does not correspond to the change in input power, and the actual degradation of the luminous flux does not match the characteristics of the luminous flux maintenance factor.

  Therefore, the illuminance correction device 14 according to the present embodiment performs the illuminance correction by instructing the power supplied to the fluorescent lamp La based on the luminous flux maintenance factor curve Ya shown in FIG. For example, the luminous flux maintenance factor curve Ya includes a luminous flux maintenance factor curve Y32s at an input power of 32 W from lighting time 0 to T1 (2000 hours), and a luminous flux maintenance factor at an input power of 45 W from lighting times T1 to T2 (7000 hours). The curve Y45s and the lighting time T2 to T3 (12000 hours) are configured by a luminous flux maintenance factor curve Y50s at an input power of 50 W, and the lighting time T3 is configured by a luminous flux maintenance factor curve Y60s at an input power of 60 W. That is, as the lighting time elapses, the input power of the fluorescent lamp is increased in the order of 32 W → 45 W → 50 W → 60 W. Every time the input power is changed, the luminous flux maintenance factor curve Y32s corresponding to the input power. , Y45s, Y50s, and Y60s, the next input power change timing is determined, and a plurality of luminous flux maintenance factor curves Y32s, Y45s, Y50s, and Y60s corresponding to each of these input powers are continued to obtain a luminous flux maintenance factor curve. Ya is generated.

  Thus, since the characteristic of the luminous flux maintenance factor curve Ya is in line with the actual input power of the fluorescent lamp, it substantially coincides with the actual reduction of luminous flux, and the illuminance correction device 14 follows this luminous flux maintenance factor curve Ya. Therefore, the luminous flux output from the fluorescent lamp La is controlled to be substantially constant regardless of the lighting time and the change in input power with the lighting time. The accuracy of correction is improved. Thus, the change of the input power with respect to the lighting time can be arbitrarily performed based on the luminous flux maintenance factor curve Ya.

  Next, a method for calculating the luminous flux maintenance factor curve Ya will be described.

  First, the luminous flux maintenance factor D is expressed by [Equation 3] by Lehmann approximation.

Here, C is a constant, t is a lighting time, τ is a lifetime constant of the fluorescent lamp, and p is an input power of the fluorescent lamp.

Further, the initial value D ₀ of the luminous flux maintenance factor D in the above [Equation 3] is set to be 1 when the lighting time t = 100 h (hours) as shown in [Equation 4].

Here, C ₀ is a constant at t = 100 h, and p ₀ is an input power at t = 100 h.

Then, the luminous flux maintenance factor D _n at a lighting time t time t _n is represented by [Equation 5].

Here, C _k is a constant at t = t _k , and p _k is an input power at t = t _k (where k = 0, 1, 2,... N-1, n, n + 1,. ..).

In the above Equation 5 represents the luminous flux maintenance factor _{D n (t} n _{+ 1)} at next time _{t n + 1} when the input power _{p n} of the fluorescent lamp La. That, and the luminous flux maintenance factor is represented by Equation 5 in the lighting time t _{n + 1} when the input power is changed from p _n to p _{n + 1,} it is possible to predict the luminous flux maintenance factor. Therefore, even when the input power is changed during the lighting time, the luminous flux maintenance factor curve Ya shown in FIG. 5 can be derived.

  Since the relationship between the luminous flux φ output from the fluorescent lamp La and the input power p of the fluorescent lamp La is expressed by [Equation 6], the input power p for outputting the luminous flux φ during a certain lighting time t is determined. .

  In the present embodiment, the luminous flux maintenance factor curve Ya is calculated in advance from the lighting start to the lifetime based on [Equation 5], and the correction data of the fluorescent lamp La1 based on the luminous flux maintenance factor curve Ya is stored in the correction data storage unit 15. Stored in advance, the illuminance correction device 14 instructs the power supplied to the fluorescent lamp La1 as the lighting time elapses along the correction data in the correction data storage unit 15. Therefore, since the luminous flux maintenance factor is calculated in advance and correction data based on the luminous flux maintenance factor curve is generated in advance, it is not necessary to provide the lighting fixture 1 with a means for calculating the luminous flux maintenance factor, and the light source lighting control configuration can be realized. It can be simplified. In this embodiment, the maintenance rate is 70%. In the example shown in FIG. 5, the input power of the fluorescent lamp La is changed to four stages, but it may be changed more finely to multiple stages.

  FIG. 6 shows correction data when the fluorescent lamp La uses the FHF 63 (high-frequency lighting dedicated type, straight tube type, rated lamp power 63 W), and the correction data includes the luminous flux maintenance factor and input power for each lighting time. A table having the lighting time 100 hours, 1000 hours, 2000 hours,... According to the correction data in the table. . . The electric power supplied to the fluorescent lamp is gradually increased.

  FIG. 7 shows the luminous flux maintenance factor curve Yb based on the correction data of FIG. 6 and the input power pattern Yp of the fluorescent lamp La, and the input power pattern Yp is finely increased stepwise as the lighting time elapses. However, whenever the input power is changed, the next input power change timing is determined based on the luminous flux maintenance factor curve corresponding to the input power, and a plurality of luminous flux maintenance factors corresponding to each of the input powers are determined. The curve is continued to generate the luminous flux maintenance factor curve Yb.

(Embodiment 2)
As shown in FIG. 8, the lighting fixture 1 of the present embodiment is provided with a correction data calculation unit 16 instead of the correction data storage unit 15 of the first embodiment, and the correction data calculation unit 16 is a fluorescent lamp. During the lighting control, the current lighting time t _n , the input power p _n of the fluorescent lamp, and the luminous flux maintenance factor D _n−1 (t _n ) are applied to [Equation 5], and the luminous flux maintenance factor at the next time t _{n + 1} . D _n (t _{n + 1} ) is calculated sequentially. Then, the illuminance correction device 14 instructs the power to be supplied to the fluorescent lamp La at the next time t _{n + 1} based on the calculated luminous flux maintenance factor D _n (t _{n + 1} ). Therefore, it is not necessary to store correction data in advance, and illuminance correction according to the usage state of each lighting fixture 1 can be performed.

If the correction data calculation unit 16 that sequentially calculates the luminous flux maintenance factor D _n (t _{n + 1} ) is used, the input power of the fluorescent lamp is increased as the lighting time elapses according to the usage state of each luminaire 1. Not only can it be reduced.

(Embodiment 3)
In the present embodiment, the fluorescent lamp used as the light source in the first or second embodiment will be described. FIG. 9 shows the structure of the tube end electrode portion of a straight tube fluorescent lamp La1 having a rated lamp power of 32W to 45W. A filament 2 is pinched between two lead wires 4 and 4. 3 is an emitter. Reference numeral 5 denotes a glass stem, 6 denotes a glass bulb having a protective film 7 and a phosphor layer 8 formed on the inner surface, and the electrode portions are formed at both ends of the glass bulb 6. A discharge gas such as mercury and argon is sealed in the tube.

  FIG. 10 is an enlarged view of the filament 2, and FIG. 11 is a partially enlarged view of the filament 2. The filament 2 is configured by a so-called triple coil formed by gently winding the outer periphery of the main wire 2a with a thin wire 2b. Furthermore, an emitter 3 is attached to the filament 2. In the fluorescent lamp La1 of the present embodiment, in order to increase the lamp output while ensuring a lamp life substantially the same as the conventional one, a conventional straight fluorescent lamp having a rated lamp power of 32W to 45W (for example, FHF32: Compared with dedicated high-frequency lighting type, straight tube type, rated lamp power of 32W, FLR40s: rapid start type, straight tube type, rated lamp power of 40W, etc., the diameter D1 of the main line 2a is increased, and the amount of emitter 3 is further increased. Is increasing.

  First, the wire diameter D1 of the main wire 2a will be described. Increasing the lamp power increases the filament surface temperature, leading to faster emitter wear and shorter lamp life. Therefore, in order to increase the light output by inputting high power to the lamp, it is necessary to suppress the surface temperature of the filament in the high output region. Here, when the conventional lamp output is increased by 1.4 to 2 times, the lamp current is increased by approximately 1.5 to 3 times. Considering the point proportional to the resistance, the temperature rise can be suppressed by making the diameter D1 of the main line 2a about 1.25 to 1.7 times that of the conventional one. Therefore, the filament of a conventional straight tube fluorescent lamp having a rated lamp power of 32 W to 45 W has a main line diameter of about 50 to 65 μm. Therefore, in the fluorescent lamp La1 of this embodiment, the main line of the filament 2 is used. The wire diameter D1 of 2a is set to about 65 to 100 μm, and the filament resistance is reduced as compared with the conventional case.

  FIG. 12 shows the relationship between the lamp current and the estimated coil temperature on the surface of the main line of the filament. The straight tube type having the rated lamp power of 32 W to 45 W of the temperature curve Yt1 of the fluorescent lamp La1 of the present embodiment. Comparing with the temperature curve Yt2 of the fluorescent lamp, the fluorescent lamp La1 of the present embodiment has a surface temperature of the main line 2a (wire diameter D1 = about 70 μm) saturated in a region where the filament current is large (see the temperature curve Yt1). In the conventional fluorescent lamp, the surface temperature of the main line (wire diameter = about 50 μm) continues to rise even in the region where the filament current is large (see temperature curve Yt2). The temperature of the main line is lower in the fluorescent lamp La1 of this embodiment over the entire region of the filament current, and the temperature difference is particularly large in the region where the filament current is large. That is, when the filament current is the same, the fluorescent lamp La1 of the present embodiment has a lower filament temperature than the conventional one, and the consumption of the emitter is suppressed to have a long lifetime. The lamp La1 can increase the lamp output as compared with the prior art. Further, the filament 2 is not limited to a triple coil, and may have another configuration such as a double coil. In this case, the coil wire diameter is formed to be about 65 to 100 μm.

  In addition, the filament diameter D2 of the filament is about 20 to 25 μm in a conventional straight tube fluorescent lamp having a rated lamp power of 32 W to 45 W. In the fluorescent lamp La1 of the present embodiment, the diameter D2 of the thin line 2b. May be made larger than the conventional 20 to 25 μm, or 20 to 25 μm.

  Next, the amount of the emitter 3 will be described. The amount of emitter determines the life of the fluorescent lamp, and the consumption rate of the emitter depends on the surface temperature of the filament 2. FIG. 13 shows the relationship between the lamp lighting time and the remaining amount of the emitter. The emitter remaining amount curve Yr1 when the fluorescent lamp La1 of the present embodiment has a large output (output 63W) and the conventional 32W to 45W. Emitter remaining amount curve Yr2 at the rated output of a straight tube fluorescent lamp having a rated lamp power of 5 mm, and the remaining emitter at the time of a large output (at 63 W output) of a conventional straight tube fluorescent lamp having a rated lamp power of 32 W to 45 W A quantity curve Yr3 is shown.

  In the case of a conventional straight tube type fluorescent lamp having a rated lamp power of 32 W to 45 W, the amount of emitter is about 5 mg, and at the rated output, the emitter disappears completely after about 15000 hours of lighting (see remaining emitter curve Yr2). Furthermore, at a higher output (63 W output), the consumption of the emitter was severe, and the emitter disappeared completely after the lighting time of about 9000 hours (see the remaining emitter curve Yr3).

  On the other hand, the fluorescent lamp La1 of the present embodiment uses the filament 2 in which the wire diameter D1 of the main line 2a is set to about 65 to 100 μm as described above, and the filament resistance is reduced from the conventional fluorescent lamp of the same rating. When the filament temperature can be lowered as compared with the conventional case and the amount of emitter is set to about 5 mg, it takes about 11000 hours longer than the conventional lamp until the emitter is completely removed at a large output (63 W output). In order to achieve the same life (for example, about 18000 hours) as a straight tube fluorescent lamp having a rated lamp power of 32 W to 45 W, when the amount of emitter is about 9 mg, about 20000 hours until the emitter is completely eliminated. (Refer to the remaining emitter curve Yr1). Therefore, if the emitter amount is about 5 to 11 mg, it is considered that the lamp output can be increased while ensuring a lamp life that is practically the same as that in the past.

  That is, the straight tube fluorescent lamp La1 having the rated lamp power of 32W to 45W of the present embodiment has the conventional diameter of 32W by setting the diameter D1 of the main line 2a of the filament 2 to about 65 to 100 μm as described above. Compared to a straight tube fluorescent lamp having a rated lamp power of ˜45 W, the consumption of the emitter 3 is suppressed, and the amount of the emitter 3 is increased to about 5 to 11 mg, so that the lamp life is almost the same as the conventional one. It is possible to increase the lamp output while ensuring it. For example, it is possible to obtain a sufficient lamp life even if input power having a rating (100%) or more is supplied to the fluorescent lamp La1.

Further, in the fluorescent lamp La1 of the present embodiment, a protective film 7 is formed between the glass bulb 6 and the phosphor layer 8, as shown in FIG. The protective film 7 is made of a metal oxide such as aluminum oxide (Al ₂ O ₃ ), for example, and suppresses the reaction between mercury enclosed in the glass bulb 6 and the glass bulb 6 and has a high luminous flux maintenance factor. be able to. The protective film 7 can improve the luminous flux maintenance factor by setting the film thickness to 1 to 3 μm. In addition to aluminum oxide, it is preferable to use a metal oxide such as silicon dioxide (SiO ₂ ), yttrium oxide (Y ₂ O ₃ ), titanium oxide (TiO ₂ ), or cerium oxide (CeO) as the protective film 7. Further, when the protective film 7 is formed of, for example, titanium oxide (TiO ₂ ) or cerium oxide (CeO), it has a function of blocking the ultraviolet rays emitted from the mercury so that the ultraviolet rays emitted from the mercury do not leak from the glass bulb 6. It can also be made.

  Next, the illumination using the conventional fluorescent lamp La101 and the illumination using the fluorescent lamp La1 of this embodiment will be compared. First, FIG. 15A shows the external appearance of a conventional lighting fixture 100A, which is a long casing 101a, a concave reflecting plate 101b provided on the lower surface of the casing 101a, and a recess in the reflecting plate 101b. And a conventional fluorescent lamp La101 (for example, FHF32: high-frequency lighting-only type, straight tube type, rated lamp power 32W), and lighting for controlling the lighting of the fluorescent lamp La101 in the housing 101a. The unit 110 is accommodated, and the fluorescent lamp La101 is connected to the lighting unit 110 via the socket 101c. The reflection plate 101b is fixed to the housing 101a by inserting a mounting screw 101d into a mounting hole (not shown) provided behind the fluorescent lamp La101 with the bottom surface in contact with the lower surface of the housing 101a. . And the collar part 101e is provided along the both sides | surfaces of the transversal direction of the housing | casing 101a, and the edge part of the collar part 101e is latched to the opening end of the lower surface side of the installation hole drilled in the ceiling surface. Yes.

  On the other hand, FIG. 15B shows the external appearance of a lighting fixture 1A equipped with the fluorescent lamp La1 of the present embodiment. A long casing 21a and a concave reflector 21b provided on the lower surface of the casing 22a. And a single fluorescent lamp La1 disposed in the recess of the reflecting plate 21b, the lighting unit 10 for controlling the lighting of the fluorescent lamp La1 is housed in the housing 21a, and the fluorescent lamp La1 is connected via the socket 21c. Are connected to the lighting unit 10. And the edge part of the both sides | surfaces of the transversal direction of the reflecting plate 21B is made to latch to the opening end of the lower surface side of the installation hole drilled in the ceiling surface.

  FIG. 16 shows an illuminance distribution obtained by illuminating the interior of the room R using the conventional luminaire 100A, and FIG. 17 shows an illuminance distribution obtained by illuminating the interior of the room R using the illuminator 1A of the present embodiment. The room R has a length of 19.2 m, a width of 12.8 m, and the fluorescent lamp is mounted at a height of 2.7 m. The ceiling reflectance is 50%, the wall reflectance is 30%, and the floor reflectance is 10%.

  First, a total of 77 conventional lighting fixtures 100A having 11 columns in the length direction of the room R and 7 rows in the width direction of the room R are installed, and the luminous flux output from one fluorescent lamp La101 is 4950 lm. The horizontal illuminance distribution (calculated surface height 0.7 m) is shown in FIG. 16, the average illuminance is 773 lx, the minimum illuminance is 282 lx, the maximum illuminance is 914 lx, the illuminance uniformity (minimum illuminance / average illuminance) is 0.365, The illuminance uniformity (minimum illuminance / maximum illuminance) is 0.308.

  Also, a total of 60 lighting fixtures 1A of the present embodiment having 10 columns in the length direction of the room R and 6 rows in the width direction of the room R are installed, and the luminous flux output from one fluorescent lamp La1 is 6300 lm. The horizontal illuminance distribution (calculated surface height 0.7 m) in this case is shown in FIG. 17. The average illuminance is 752 lx, the minimum illuminance is 272 lx, the maximum illuminance is 887 lx, and the illuminance uniformity (minimum illuminance / average illuminance) is 0. 362, the illuminance uniformity (minimum illuminance / maximum illuminance) is 0.307.

  From the above illuminance distribution, 77 conventional fluorescent lamps La101 are installed to output a light beam of 4950 lm per lamp, and 60 fluorescent lamps La1 of this embodiment are installed to provide 6300 lm per lamp. When the luminous flux is output, the illuminance distribution in the room R is substantially the same. When a new illumination system is installed, the configuration using the fluorescent lamp La101 is used instead of the conventional fluorescent lamp La101. By increasing the light output per lamp, the number of fluorescent lamps can be reduced without deteriorating the illuminance distribution and the lamp life of the entire room compared to the prior art. It becomes possible.

(Embodiment 4)
FIG. 18 (a) shows the appearance of a conventional lighting fixture 100B. The long casing 102a, the concave reflector 102b provided on the lower surface of the casing 102a, and the concave portion of the reflector 102b are arranged in parallel. Two conventional fluorescent lamps La102 and La102 (for example, FLR40s: rapid start type, straight tube type, rated lamp power 40W) and a lighting unit for controlling the lighting of the fluorescent lamp La102 in the housing 102a 110 is housed, and the fluorescent lamp La102 is connected to the lighting unit 110 via the socket 102c. The reflecting plate 102b is fixed to the casing 102a by inserting mounting screws 102d into mounting holes (not shown) provided at the rear of the fluorescent lamp La102 with the bottom surface in contact with the lower surface of the casing 102a. . And the collar part 102e is provided along the both sides | surfaces of the transversal direction of the housing | casing 102a, and the edge part of the collar part 102e is latched to the opening end of the lower surface side of the installation hole drilled in the ceiling surface. Yes.

  On the other hand, FIG. 18B shows the appearance of a lighting fixture 1B equipped with the fluorescent lamp La1 of Embodiment 3, and includes a long housing 22a and a bowl-shaped reflector provided on the lower surface of the housing 22a. 22b and a single fluorescent lamp La1 disposed in the collar portion of the reflector 22b. The lighting unit 10 of the first or second embodiment for controlling the lighting of the fluorescent lamp La1 is housed in the housing 22a. The lamp La1 is connected to the lighting unit 10 via the socket 22c, and the accuracy of illuminance correction is improved.

  The bowl-shaped reflecting plate 22b is provided with a fixing portion 22f having a flat bottom portion, and the flat fixing portion 22f is in contact with the lower surface of the housing 22a, behind the fluorescent lamp La1. An attachment screw 22d is inserted into the provided attachment hole (not shown) and fixed to the housing 22a. By forming the fixing portion 22f in a planar shape, workability when attaching the reflection plate 22b to the housing 22a is improved. In addition, the fluorescent lamp La1 is disposed close to the fixing portion 22f of the reflector 22b so that the mounting screw 22d is blocked by the fluorescent lamp La1 when viewed from below and is difficult to see, thereby improving the design. . Further, the curvature of the flange portion of the reflecting plate 22b and the distance between the reflecting plate 22b and the fluorescent lamp La1 are set in consideration of the instrument efficiency and the glare cut property. And the collar part 22e is provided along the both sides | surfaces of the transversal direction of the housing | casing 22a, The edge part of the collar part 22e is made to latch on the opening end of the lower surface side of the installation hole drilled in the ceiling surface. Yes.

  Since the lighting fixture 1B includes only one fluorescent lamp La1, the number of fluorescent lamps can be reduced by half compared to the conventional lighting fixture 100B including two fluorescent lamps La102, and the cost can be reduced. It becomes. In addition, the fluorescent lamp La1 is configured in the same manner as in the third embodiment, and even when the lighting unit 10 increases the lamp output, it is possible to ensure a lamp life that is substantially the same as that of the conventional one. Even if electric power is supplied to the fluorescent lamp La1, it is possible to obtain a sufficient lamp life.

  The lighting fixture 100B provided with two conventional fluorescent lamps La102 is installed in a total of 54 pieces (108 fluorescent lamps La102) in nine rows in the length direction of the room R and six rows in the width direction of the room R. The horizontal illuminance distribution (calculated surface height 0.7 m) when the luminous flux output from one fluorescent lamp La102 is 3000 lm is shown in FIG. 19, the average illuminance is 754 lx, the minimum illuminance is 185 lx, and the maximum illuminance is 998 lx, the illuminance uniformity (minimum illuminance / average illuminance) is 0.245, and the illuminance uniformity (minimum illuminance / maximum illuminance) is 0.185.

  In addition, the lighting fixture 1B provided with one fluorescent lamp La1 of the present embodiment is a total of 54 pieces (54 fluorescent lamps La1 in 9 rows in the length direction of the room R and 6 rows in the width direction of the room R). The horizontal illuminance distribution (calculated surface height 0.7 m) when installed and the luminous flux output from one fluorescent lamp La1 is 6300 lm is shown in FIG. 20, the average illuminance is 783 lx, the minimum illuminance is 187 lx, the maximum The illuminance is 1034 lx, the illuminance uniformity (minimum illuminance / average illuminance) is 0.238, and the illuminance uniformity (minimum illuminance / maximum illuminance) is 0.180.

  From the above illuminance distribution, 108 conventional fluorescent lamps La102 are installed to output a luminous flux of 3000 lm per lamp, and 54 fluorescent lamps La1 of this embodiment are installed to provide 6300 lm per lamp. When the luminous flux is output, the illuminance distribution in the room R is substantially the same, and the existing luminaire 100B is replaced with the luminaire 1B equipped with the fluorescent lamp La1, thereby increasing the light output per lamp. By adopting the configuration, the number of fluorescent lamps can be reduced and the cost can be reduced without deteriorating the illuminance distribution and the lamp life of the entire room as compared with the conventional case.

  Further, as shown in FIG. 21, the curvature of the flange portion of the reflecting plate 22b and the distance between the reflecting plate 22b and the fluorescent lamp La1 are set differently from the lighting fixture 1B, and the width of the fixture is substantially half that of the lighting fixture 1B. Even when the lighting fixture 1C is used, the same effect as the lighting fixture 1B can be obtained, and further, the installation space can be reduced.

  Furthermore, as shown in FIG. 22 (a), a lighting fixture 100D having a housing 102h that also serves as a reflector and mounting two conventional fluorescent lamps La102 is replaced with a reflector as shown in FIG. 22 (b). Even if the omitted housing 22h is provided and the fluorescent lamp La1 of the first embodiment is replaced with a lighting fixture 1D, the fluorescent lamp can be obtained without deteriorating the illuminance distribution and the lamp life of the entire room as compared with the conventional case. The number of lamps can be reduced, and the cost and installation space can be reduced.

(Embodiment 5)
In the third and fourth embodiments, a straight tube fluorescent lamp having a rated lamp power of 32 W to 45 W has been described. However, the shape of the fluorescent lamp as a light source is not limited to a straight tube, and an annular fluorescent lamp, a double ring fluorescent lamp, Similarly for compact fluorescent lamps, square fluorescent lamps, etc., the diameter of the main wire of the filament is about 70 μm and the emitter amount is about 9 mg with respect to the rated lamp power of 32 W to 45 W. The lamp output can be increased while ensuring the same lamp life as that of the fluorescent lamp.

  For example, in the case of a luminaire using a double ring fluorescent lamp, a conventional rating of 32 W to 45 W is provided on the lower surface side of a partition plate 103 b provided in a cylindrical housing 103 a as shown in FIG. A lighting fixture 100E equipped with two lamps having a double-ring fluorescent lamp La103 having lamp power (for example, FHD40: dedicated high-frequency lighting type, double-ring type, rated lamp power 40W) is formed into a cylinder as shown in FIG. On the lower surface side of the partition plate 23b provided in the housing 23a, the double-ring fluorescent lamp La2 of this embodiment (rated lamp power: 32 W to 45 W, filament main wire diameter: about 70 μm, emitter amount: about 9 mg) is replaced with a lighting fixture 1E equipped with a single lamp, and the light output per lamp is increased so that the illuminance distribution and the lamp life of the entire room are not deteriorated compared to the conventional one. It is possible to reduce the lighting number of flops, it is possible to achieve a reduction of cost and installation space.

  In the lighting fixture 100E, the lighting unit 110 disposed on the upper surface side of the partition plate 103b controls the lighting of the fluorescent lamp La103, and a cover 103c is covered on the lower surface opening of the housing 103a. Further, in the lighting fixture 1E, the lighting unit 10 of Embodiment 1 or 2 arranged on the upper surface side of the partition plate 23b controls the lighting of the fluorescent lamp La2, thereby improving the accuracy of illuminance correction. A lid 23c is provided over the lower surface opening.

  In the case of a lighting fixture using a square fluorescent lamp, a double square fluorescent lamp La104 having a conventional rated lamp power of 32 W to 45 W in a box-shaped casing 104a as shown in FIG. A lighting fixture 100F having a single lamp is mounted in a square-shaped fluorescent lamp La3 (rated lamp power: 32 W to 45 W, rated filament power of the present embodiment) in a box-shaped housing 24a as shown in FIG. Even if it is replaced with a lighting fixture 1F equipped with a single lamp (wire diameter: approx. 70 μm, emitter amount: approx. 9 mg), the light output per lamp is increased so that the illuminance distribution and the lamp life of the entire room are compared with the conventional one. The fluorescent lamp can be changed from double to single without deteriorating the cost, thereby reducing the cost.

(Embodiment 6)
FIG. 25A shows a conventional lighting unit U100. The lighting unit U100 is a compact fluorescent lamp La105 (for example, FPL36) having a rated lamp power of 32 W to 45 W in a box-shaped case K100. : Compact type, rated lamp power 36W), four lighting fixtures 100G provided with one lamp, and a total of four fluorescent lamps La105.

  FIG. 25 (b) shows the illumination unit U1 of the present embodiment. The illumination unit U1 includes a compact fluorescent lamp La4 (rated lamp power: 32 W to 45 W of this embodiment) in a box-shaped case K1. Two lighting fixtures 1G each having one main filament diameter: about 70 μm and emitter amount: about 9 mg) are provided side by side, and a total of two fluorescent lamps La4 are provided. The dimensions of the case K1 are the same as those of the case K100. After the conventional lighting unit U100 already installed on the ceiling surface or the like is removed, the lighting unit U1 of this embodiment can be easily attached. it can.

  Therefore, by replacing the existing lighting unit U100 with the lighting unit U1 and increasing the light output per lamp, the number of fluorescent lamps can be reduced without deteriorating the illuminance distribution and the lamp life of the entire room as compared with the prior art. The cost can be reduced.

  Moreover, the lighting fixture 1G mounts the lighting unit 10 of Embodiment 1 or 2 and controls the lighting of the fluorescent lamp La4, thereby improving the accuracy of illuminance correction.

  In the first to sixth embodiments, a fluorescent lamp is used as a light source. However, the same illuminance correction is performed even for a light source such as another discharge lamp such as a mercury lamp or a sodium lamp, an incandescent lamp, or an LED element. Thus, the accuracy of illuminance correction can be improved.

It is a block diagram which shows the structure of the lighting fixture of Embodiment 1. FIG. It is a figure which shows the experimental result of the input power dependence of a luminous flux maintenance factor. It is a figure which shows the relationship between the input electric power of a fluorescent lamp, and a lifetime constant. It is a figure which shows the simulation result of the input power dependence of a luminous flux maintenance factor. It is a figure which shows the characteristic of the light beam maintenance factor of Embodiment 1. It is a figure which shows the table | surface used for illumination intensity correction same as the above. It is a figure which shows the control pattern of illumination intensity correction same as the above. It is a block diagram which shows the structure of the lighting fixture of Embodiment 2. FIG. It is a partially broken perspective view which shows the structure of the tube end part electrode part of the fluorescent lamp of Embodiment 3. It is a front view which shows a filament same as the above. It is a partial cross section enlarged view which shows a filament same as the above. It is a figure which shows the relationship between lamp current same as the above and estimated coil temperature. It is a figure which shows the relationship between lighting time same as the above and remaining amount of emitters. It is a partial expanded sectional view of a fluorescent lamp same as the above. (A) is sectional drawing which shows the conventional lighting fixture, (b) is sectional drawing which shows the lighting fixture of Embodiment 3. FIG. It is a top view which shows the conventional illuminance distribution. It is a top view which shows the illumination intensity distribution of Embodiment 3. (A) is the side view and Z1-Z1 'sectional view which show the conventional lighting fixture, (b) is the side view and Z2-Z2' sectional view which shows the lighting fixture of Embodiment 4. It is a top view which shows the conventional illuminance distribution. It is a top view which shows the illumination intensity distribution of Embodiment 4. It is sectional drawing which shows another lighting fixture of Embodiment 4. (A) is the side view and Z4-Z4 'sectional view which show the conventional lighting fixture, (b) is the side view and Z5-Z5' sectional view which shows another lighting fixture of Embodiment 4. (A) is the side view and sectional drawing which show the conventional lighting fixture, (b) is the side view and sectional drawing which show the lighting fixture of Embodiment 5. (A) is the side view and sectional drawing which show the conventional lighting fixture, (b) is the side view and sectional drawing which show another lighting fixture of Embodiment 5. FIG. (A) is the side view and sectional drawing which show the conventional lighting unit, (b) is the side view and sectional drawing which show the lighting unit of Embodiment 6. (A) is a figure which shows the conventional light beam maintenance factor curve, (b) is a figure which shows the illumination intensity correction based on (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting fixture 10 Lighting unit 11 Lighting device 12 Lighting time detection part 13 Lighting time timer 14 Illuminance correction apparatus 15 Correction data storage part La Fluorescent lamp AC Commercial power supply

Claims (5)

The power supplied to the light source is controlled based on the luminous flux maintenance factor of the light source so as to suppress the luminous flux decrease with the passage of the lighting time of the light source, and the luminous flux maintenance factor is determined by the lighting time of the light source and the input power of the light source at the lighting time. The illumination control method is calculated according to the above. Calculating the luminous flux maintenance factor in advance for a predetermined period, storing correction data based on the calculated luminous flux maintenance factor in a storage unit, and controlling power supplied to the light source based on the stored correction data. The illumination control method according to claim 1, wherein: A light flux maintenance factor after the predetermined time is sequentially calculated according to a lighting time at a predetermined time and an input power of the light source, and power supplied to the light source is controlled based on the calculated light flux maintenance factor. The illumination control method according to claim 1. 4. A light source characterized in that lighting control is performed using the illumination control method according to any one of claims 1 to 3. Calculated according to the light source, the lighting device that supplies power to the light source, the lighting time timer that counts the power supply time to the lighting device as the lighting time of the light source, and the lighting time of the light source and the input power of the light source at the lighting time An illuminator comprising: an illuminance correction device that instructs the lighting device to supply power to the light source so as to suppress a decrease in the luminous flux associated with the lapse of the lighting time of the light source based on the luminous flux maintenance factor.

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