JP2011018620A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture having a circular fluorescent lamp as a light source for an exclusive use for high-frequency lighting, and improved energy consumption efficiency.SOLUTION: The lighting fixture is provided with a lighting fixture body 21 equipped with a lamp housing space LS, a circular fluorescent lamp 22 equipped with a glass bulb 21a having a tube diameter of 15-18 mm and a ring outer diameter of 213-459 mm, a phosphor layer arranged on an inner surface side of the glass bulb, a pair of electrodes arranged inside of both ends of the glass bulb, and a discharge medium containing mercury or rare gas sealed inside the glass bulb, and arranged in the lamp housing space of the lighting fixture body for an exclusive use for high-frequency lighting, and a discharge lamp lighting device 23 outputting high-frequency voltage and lighting so that lamp current of the circular fluorescent lamp for an exclusive use for high-frequency lighting will be in a range of 190-240 mA at full lighting.

Description

  The present invention relates to a lighting fixture that uses a ring-shaped fluorescent lamp dedicated to high-frequency lighting as a light source.

  A ring-shaped fluorescent lamp dedicated to high-frequency lighting is known (see Patent Document 1). At present, a commercially available ring fluorescent lamp dedicated for high-frequency lighting is as shown in FIG. 2, and the rated lamp power and the rated lamp current are relatively double rated on the low output side and the high output side. However, a luminaire that has been put into practical use using a ring-shaped fluorescent lamp dedicated to high-frequency lighting as a light source is configured to be lit at a high-output-side rated lamp current and to input a high-output-side rated lamp power. In this case, since the total luminous flux radiated from the fluorescent lamp becomes large, emphasis is placed on performing high quality illumination with a sense of brightness.

JP 09-320526 A

  However, the prior art has not paid attention to energy consumption efficiency even if the lamp luminous flux is mainly emphasized.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a luminaire having an annular fluorescent lamp dedicated to high-frequency lighting as a light source and improved energy consumption efficiency. Another object of the present invention is to provide an illuminating device that can obtain almost the same device luminous flux even though the device efficiency is improved and the power consumption is low due to the improved energy consumption efficiency. To do.

  In order to solve the above-described problems, a lighting fixture of the present invention includes a lighting fixture main body having a lamp housing space; a glass bulb having a tube diameter of 15 to 18 mm and a ring outer diameter of 213 to 459 mm; and an inner side of the glass bulb. A fluorescent material layer, a pair of electrodes disposed inside both ends of the glass bulb, and a discharge medium containing mercury and a rare gas sealed inside the glass bulb, and a lighting fixture body that is exclusively for high-frequency lighting An annular fluorescent lamp disposed in the lamp housing space; a high-frequency voltage is output, and the rated lamp power on the low output side is set to 190 to 240 mA for the high-frequency lighting dedicated lamp power when the all-lights are lit. And a discharge lamp lighting device for lighting.

  In the present invention, the lamp current when the ring-shaped fluorescent lamp dedicated for high-frequency lighting is turned on all the light is set to the rated value on the low output side as described above, so that the lamp power on the high output side is turned on and the lamp is turned on. Compared with the conventional lighting fixture, the temperature inside the fixture is optimized, and the illuminance peak value of the tube wall temperature-illuminance characteristic curve in the lighting fixture moves to a region where the tube wall temperature is high. The tube wall temperature in the tube wall temperature-illuminance characteristic curve is the temperature of the coldest part of the glass bulb.

  That is, in the case of a conventional lighting fixture using this type of fluorescent lamp as the light source, the lamp current increases as the rated lamp power on the high output side is turned on. The temperature rises and the coldest part temperature of the fluorescent lamp increases accordingly. As a result, the ring-shaped fluorescent lamp is lit in a region where the illuminance value separated from the peak value in the tube wall temperature-illuminance characteristic curve is small, so that the ratio of the actual lamp light flux to the rated light flux becomes small.

  On the other hand, in the present invention, when the lamp current is on the low output side, the lamp current becomes relatively small. Therefore, the amount of heat generated in the fixture is reduced, the temperature inside the fixture is lowered, and the fluorescent lamp has the lowest temperature. Cold part temperature becomes low. As a result, the annular fluorescent lamp is turned on at the illuminance peak value of the tube wall temperature-illuminance characteristic curve or in the vicinity thereof, the lamp luminous flux is increased, and the energy consumption efficiency of the luminaire is improved.

  In the present invention, the rated lamp power on the low output side can be supplied by supplying the rated lamp current on the low output side, and the temperature inside the appliance is optimized for this purpose. An annular fluorescent lamp dedicated to high-frequency lighting is lit at the peak illuminance value of the curve or in the vicinity thereof, and the energy efficiency of the lighting fixture is improved.

  The rated lamp current on the low output side of the ring fluorescent lamp dedicated for high-frequency lighting used in the present invention has a center value of 215 mA. However, in order to keep the load fluctuation of the electric equipment within ± 25%, the load current Therefore, it is allowed to expect a variation of ± 11.8% with respect to the center value of the lamp current. Therefore, in the present invention, the rated lamp current on the low output side in the annular fluorescent lamp dedicated for high-frequency lighting has a width of 190 to 240 mA.

A preferable first aspect of the present invention is as follows. That is, a pair of annular fluorescent lamps, one of which has a small outer ring diameter and the other of which has a large outer ring diameter, both of which are concentrically arranged in the lamp housing space of the luminaire body, and have a low The total rated lamp power on the output side is 47 to 75 W; the lamp housing space has a volume per unit lamp power of 30 to the total lamp power when the pair of annular fluorescent lamps are fully lit. 940 cm ³ ;

  The first aspect defines the size of the lamp housing space of the luminaire main body with high consumption efficiency in a configuration including two ring fluorescent lamps dedicated to high-frequency lighting with different ring outer diameters.

  The lighting fixture main body can obtain the effects of the present invention regardless of whether the lamp housing space is closed with the lower surface cover and the lamp housing space is opened without the lower surface cover. Can do. In the aspect provided with the lower surface cover, setting the tube wall temperature in the vicinity of the peak value of the tube wall temperature-illuminance characteristic curve and in a region on the higher temperature side than the peak value is not possible in the lamp housing space of the lighting fixture body. It is easy to select the size appropriately according to the above-described embodiment.

In the above description, the lower limit 30 cm ³ of the volume per unit lamp power with respect to the total lamp power when the pair of ring fluorescent lamps are fully lit, gives some allowance to the outer ring diameter and the tube diameter of the large diameter fluorescent lamp. This is the case of the lamp housing space. Similarly, the upper limit value 940 cm ³ is the volume of the lamp housing space when the basic shape is a cylindrical shape with a shade diameter of 650 mm and a height of 200 mm in the combination of (4) described later. In addition, the preferable volume per said unit lamp electric power of the lamp | ramp accommodation space of a lighting fixture main body is 125-177cm < ³ >.

A combination example of a pair of ring fluorescent lamps, and the volume per unit lamp power and the volume of the lamp housing space with respect to the total lamp power when the pair of ring fluorescent lamps are fully lit, the basic shape of the shade is substantially conical. The case is as follows. In addition, a suitable range is shown in ().
(1) 20 type + 27 type: 32 to 125 cm ³ / W, 1200 to 5900 cm ³ (80 to 106 cm ³ / W, 3800 to 5000 cm ³ )
(2) Type 20 + 34: 70 to 147 cm ³ / W, 3800 to 7900 cm ³ (98 to 130 cm ³ / W, 5300 to 7000 cm ³ )
(3) 27 type + 34 type: 67-143cm ³ / W, 4100-8700cm ³ (95-115cm ³ / W, 5800-7000cm ³ )
(4) Type 34 + 41: 87-177cm ³ / W, 6400-13000cm ³ (99-136cm ³ / W, 6600-10000cm ³ )
Next, when the lower surface cover is removed from the luminaire main body, the lamp housing space is opened, so that the tube wall temperature of the annular fluorescent lamp is appropriately reduced. As a result, the illuminance shifts to the peak value or near the peak value of the tube wall temperature-luminous efficiency characteristic curve and to the low temperature side. Therefore, in this invention, the lower surface cover of a lighting fixture main body does not need to be.

Even if a pair of ring-shaped fluorescent lamps has a minimum rated lamp power of 47 W on the low output side, if the volume of the lamp housing space is less than about 1200 cm ³ , the tube wall temperature during all-light lighting becomes too high and the ring shape The luminous efficiency of the fluorescent lamp is too low. On the other hand, if the volume of the lamp housing space exceeds about 13000 cm ³ , even if the rated lamp power on the low output side is 75 W, which is the maximum, the lighting fixture is too large and the balance of the appearance of the lighting fixture in the room is balanced. Collapse.

The volume of the lamp housing space is preferably about 3800 to 10000 cm ³ . Within this range, a range slightly deviated from the peak value of the tube wall temperature-illuminance characteristic curve described later is included, but still high consumption efficiency can be obtained, and the appearance balance of the lighting equipment in the room is good. It can also respond to downsizing of lighting fixtures.

  A preferred second aspect of the present invention is as follows. That is, in the lighting fixture, the lighting fixture main body includes a reflector having a reflectance of 90% or more at least above the annular fluorescent lamp, and has a light diffusibility of 55 to 90% transmittance at least below the annular fluorescent lamp. A bottom cover is provided.

  In the second aspect, the reflecting plate may have either a diffuse reflecting surface or a specular reflecting surface. The diffuse reflection surface can be formed, for example, by applying white light reflectance coating to the surface of an aluminum alloy plate. The specular reflection surface can be formed, for example, by forming a high-purity aluminum vapor deposition film on the surface of an aluminum alloy plate and further forming a transparent metal oxide film such as alumina or silica thereon.

  The light diffusing lower surface cover is formed by using, for example, an acrylic resin plate in which light diffusing ultrafine particles are dispersed in a desired shape as appropriate, so that the total light transmittance is about 55 to 90%, preferably 70 to 90% can be obtained.

  In the luminaire of the present invention, even if the light diffusibility is lowered by increasing the transmittance of the light diffusible bottom cover, the lamp power at the time of all-light lighting of the annular fluorescent lamp is the same as that of the conventional luminaire. Since it becomes a value smaller than that, the brightness of the annular fluorescent lamp is lowered, so that the glare of the luminaire can be made equal or less. As a result, it is possible to reduce the light absorption loss when the reflected light of the annular fluorescent lamp and / or the reflecting plate passes through the light diffusing lower surface cover, and to increase the luminous flux emitted from the lighting fixture, that is, the fixture luminous flux.

  In addition to the adoption of a light diffusible bottom cover with high transmittance, it is equipped with a highly reflective reflector so that the luminous flux of a conventional luminaire that supplies rated lamp power on the high output side is provided. This increases the luminous flux of the instrument and enables illumination with high illuminance.

  Furthermore, even if the transmittance of the light diffusing bottom cover is 55% or more and less than 70% of the total light transmittance similar to that of the conventional one, the present invention improves the instrument efficiency due to the decrease in the temperature inside the instrument. This makes it possible to obtain approximately the same degree of fixture luminous flux, although slightly less than in conventional lighting fixtures that use high-power-side rated lamp power.

  The present invention relates to a high-frequency lighting-only ring-shaped fluorescent lamp having a glass bulb with a tube diameter of 15 to 18 mm and an outer ring diameter of 213 to 459 mm disposed in a lamp housing space of a lighting fixture body. By performing high-frequency lighting with a lamp current of 190 to 240 mA by the discharge lamp lighting device, there is an effect that it is possible to provide a lighting fixture having high energy consumption efficiency.

In addition, a pair of annular fluorescent lamps, one of which has a small ring outer diameter and the other of which has a large ring outer diameter, are concentrically disposed in the lamp housing space of the luminaire main body, and the low output of the pair of annular fluorescent lamps The total rated lamp power on the side is 47 to 75 W, and the lamp housing space of the luminaire body has a volume per unit lamp power of 30 to 940 cm relative to the total rated lamp power on the low output side of the annular fluorescent lamp. According to the 1st aspect which is ³ , there exists an effect which can provide the lighting fixture which is practical specification provided with a pair of ring-shaped fluorescent lamp, and can obtain high energy consumption efficiency.

  Further, the luminaire main body includes a reflector having a reflectance of 90% or more at least above the annular fluorescent lamp, and a light diffusible bottom cover having a transmittance of 55 to 90% below the annular fluorescent lamp. According to the second aspect, since it is possible to maintain an illuminance equivalent to or higher than that of a conventional lighting device of relatively high power consumption, high-quality lighting is possible, and Consumption efficiency can be remarkably improved.

The ceiling light concerning 1st Embodiment in the lighting fixture of this invention is shown, (a) is a center section front view, (b) is a center section bottom view. It is a front view of an annular fluorescent lamp. It is a table | surface which similarly shows the dimension of a ring-shaped fluorescent lamp, rated lamp electric power, and rated lamp current. It is the circuit diagram of a discharge lamp lighting device similarly. It is a graph which similarly shows the tube wall temperature-illuminance characteristic curve and tube wall temperature-lamp current characteristic curve of the ring-shaped fluorescent lamp only for high frequency lighting in a lighting fixture. It is a graph which similarly shows the spectral reflectance characteristic curve of a reflecting plate with that of a comparative example.

  Hereinafter, embodiments of the present invention will be described in detail.

  With reference to FIG. 1, the 1st form for implementing the lighting fixture of this invention is demonstrated. In this embodiment, the lighting fixture includes a lighting fixture main body 21, an annular fluorescent lamp 22, and a discharge lamp lighting device 23.

  The luminaire main body 21 includes a base 21a, a reflector 21b, a lower surface cover 21c, a lamp holder 21d, an adapter 21e, a nightlight 21f, and the like. The base 21a has a shape of a shallow and shallow basin, and is formed by press-molding a metal plate. The reflection plate 21b is formed in a downwardly convex shape and is disposed on the lower surface of the base body 21a.

  The lower surface cover 21c is formed into a shallow glove shape using light diffusing translucent plastics, and has a mounting hole in the center, and surrounds the annular fluorescent lamp 22 described later to surround the lower surface of the base 21a. It is detachably attached to. Then, the visible light emitted from the annular fluorescent lamp 22 is appropriately diffused.

  The lamp holder 21d is a means for holding an annular fluorescent lamp 22 to be described later, and in the present embodiment, the annular fluorescent lamp 22 is fixed at a position close to the reflecting plate 21b. The adapter 21e attaches the luminaire main body 21 to the ceiling surface via a hooking ceiling (not shown) and introduces a power source into the luminaire main body 21. That is, after attaching the adapter 21e to the hanging ceiling in advance and then pushing it up so that the adapter 21e is inserted into the attachment hole of the luminaire main body 21, the luminaire main body 21 is attached to the adapter 21e with one touch. Subsequently, when the connector disposed in the luminaire main body 21 is inserted into the connector receiving portion of the adapter 21e, it is connected to the power source via the adapter 21e and the hook ceiling. The night light 21f is attached to a socket attached to the base, and the light emitting portion is exposed from a hole formed in the reflection plate 21b.

  The ring-shaped fluorescent lamp 22 is dedicated to high-frequency lighting, and its external appearance is as shown in FIG. 2 and is configured as follows. In other words, a long and narrow glass bulb 22a formed in an annular shape, a base 22b bridged between both ends thereof, a phosphor layer disposed on the inner surface side of the glass bulb 22a, and a pair sealed within both ends of the glass bulb 22a. And a discharge medium containing mercury and a rare gas sealed inside the glass bulb 22a. And the ring-shaped fluorescent lamp used in the present invention has a tube diameter d of 16 mm, and is of four types of 20 types, 27 types, 34 types and 41 types depending on the size of the tube length, and thus the size of the ring, The tube length, that is, the outer ring diameter DO and the inner ring diameter DI, the rated lamp power, and the rated lamp current are as shown in the table of FIG. Note that the rated lamp power and the rated lamp current are double rated, and in the corresponding column of FIG. 3, the upper shows the rating on the high output side and the lower shows the rating on the low output side.

  The pair of annular fluorescent lamps 22A and 22B are arranged concentrically, and an example of the combination is as follows. That is, 20 type + 27 type, 20 type + 34 type, 27 type + 34 type and 34 type + 41 type.

  In FIG. 1, the lamp accommodating section LS is a volume of a space obtained by subtracting the volume of the space surrounded by the reflecting plate 21b from the volume of the lower cover 21c when the lower cover 21c has a glove shape as shown in FIG.

  As shown in FIG. 4, the discharge lamp lighting device 23 includes a DC power source 11 a, an inverter 11 b, a load circuit 11 c, and a control means 15.

  The DC power supply 11a is an input supply means viewed from an inverter 11b described later, and outputs a DC voltage and applies it to the inverter 11b as an input voltage. In the present embodiment, the DC power supply 11a includes a bridge-type full-wave rectifier circuit 11a1 and an active filter 11a2. The bridge-type full-wave rectifier circuit 11a1 has an AC input terminal connected to the low-frequency AC power supply 4 and outputs a pulsating DC voltage to a DC output terminal. The active filter 11a2 is composed of a step-up chopper, and its input terminal is connected to the DC output terminal of the bridge-type full-wave rectifier circuit 11a1. Then, the voltage is boosted to a desired voltage between both electrodes of the smoothing capacitor C1 connected in parallel to the DC output terminal of the active filter 11a2, and a smoothed DC voltage is output.

  The inverter 11b is means for converting a DC voltage output from the DC power supply 11a into a high-frequency AC, and includes at least one switching element. In the present invention, the circuit system of the inverter is not particularly limited. For example, a half bridge type inverter, a full bridge type inverter, a single stone type inverter, or the like can be used. In this embodiment, the inverter 11b is a half-bridge inverter, and a series circuit of a pair of switching elements Q1 and Q2 is connected between both ends of the DC power supply 11a, that is, between both electrodes of the smoothing capacitor C1. Then, a rectangular wave AC voltage is output between both ends of the switching element Q2.

  The load circuit 11c is interposed between the inverter 11b and the annular fluorescent lamp 22 when connecting the annular fluorescent lamp 22 to the discharge lamp lighting device 23 in order to energize the annular fluorescent lamp 22 by the output of the inverter 11b. Circuit means. The load circuit 11c includes a resonance circuit RC. Then, by connecting the annular fluorescent lamp 22 to the output terminal of the inverter 11b via the resonant circuit RC, it is possible to apply a resonant voltage that is moderately resonated to the annular fluorescent lamp 22 as desired by the load circuit 11c.

  The resonance circuit RC is preferably a series resonance circuit, and the annular fluorescent lamp 22 is connected to a position on the circuit to which the resonance voltage is applied. Further, the load circuit 11c can provide a current limiting impedance to the annular fluorescent lamp 22 connected thereto. The reactance of the resonance circuit RC can be used as the current limiting impedance.

  The control means 15 controls the drive signal of the inverter 11b as desired in response to an operation from the remote controller 3, for example.

  FIG. 5 is a graph showing a tube wall temperature-illuminance characteristic curve and a tube wall temperature-lamp current characteristic curve of a ring-shaped fluorescent lamp dedicated for high-frequency lighting in a lighting fixture. The attached one shows the change in the tube wall temperature and the relative illuminance of the luminaire when the annular fluorescent lamp 22 is turned on with the rated lamp power on the high output side. The direction with the symbol L shows the same change when the annular fluorescent lamp 22 is lit with the rated lamp power on the low output side. Moreover, the tube wall temperature-lamp current characteristic curve with the symbol Il indicates the change in the tube wall temperature at the coldest part of the glass bulb when the lamp current is changed within the range shown in the drawing.

  In FIG. 5, the lighting fixture used for the test has a volume of the lamp housing space LS in FIG. 1 of 5700 cc. In the tube wall temperature-illuminance characteristic curve, the relative illuminance is 100% when the illuminance is a peak value.

  As can be understood from the figure, when the annular fluorescent lamp 22 is turned on with the rated lamp power on the high output side, as shown in the tube wall temperature-illuminance characteristic curve H, the peak value of the obtained illuminance is the tube wall temperature of 45 ° C. As a result, the illuminance obtained at any of the rated lamp currents of 380 mA and 350 mA on the high output side is small, so that the consumption efficiency is considerably reduced.

  On the other hand, in the present invention, since the annular fluorescent lamp 22 is lit with the rated lamp power on the low output side, as shown in the tube wall temperature-illuminance characteristic curve L, the illuminance at which the peak value of the obtained illuminance can be obtained. If the tube wall temperature is 50 to 60 ° C. and the lamp current is within the rated value and allowable fluctuation range on the low output side, and thus the rated lamp power on the low output side, the temperature rise in the fixture is relative. Therefore, high illuminance near the peak value can be obtained. For this reason, according to the present invention, it is possible to illuminate with substantially the same illuminance as in a conventional luminaire that uses the rated lamp power on the high output side, despite the low power consumption of the luminaire. Excellent consumption efficiency can be obtained.

  FIG. 6 shows the spectral reflectance characteristics of the reflector, the solid line shows an example of this embodiment, and the dotted line shows a comparative example showing the conventional reflectance. In the embodiment of the present embodiment, the reflecting plate has a high reflectance characteristic with a reflectance of 90% or more. For this reason, it is possible to obtain an equivalent illuminance as compared with the conventional lighting apparatus provided with a reflector having a reflectance of about 80%.

  DESCRIPTION OF SYMBOLS 21 ... Lighting fixture main body, 22, 22A, 22B ... Ring fluorescent lamp, 23 ... Discharge lamp lighting device, 21a ... Base | substrate, 21b ... Reflector, 21c ... Bottom cover, 21d ... Lamp holder, 21e ... Adapter, 21f ... Nightlight

Claims (3)

A luminaire body with a lamp housing space;
Glass bulb with a tube diameter of 15 to 18 mm and an outer ring diameter of 213 to 459 mm, a phosphor layer arranged on the inner surface side of the glass bulb, a pair of electrodes arranged inside both ends of the glass bulb, and enclosed inside the glass bulb An annular fluorescent lamp provided with a discharge medium containing mercury and a rare gas, and disposed in a lamp housing space of a luminaire main body that is exclusively for high-frequency lighting;
A discharge lamp lighting device that outputs a high-frequency voltage, and lights the rated lamp power on the low output side when all light is lit so that the lamp current of the ring-shaped fluorescent lamp dedicated to high-frequency lighting is in the range of 190 to 240 mA;
The lighting fixture characterized by comprising. A pair of annular fluorescent lamps, one of which has a small outer ring diameter and the other has a large outer ring diameter, both of which are concentrically arranged in the lamp housing space of the luminaire body, The total lamp power at 47-75 W;
The luminaire main body has a lamp housing space with a volume per unit lamp power of ³⁰ to 940 cm ³ with respect to the total lamp power when all the pair of annular fluorescent lamps are lit;
The lighting fixture according to claim 1.   The luminaire body includes a reflector having a reflectance of 90% or more at least above the annular fluorescent lamp, and a light diffusible bottom cover having a transmittance of 55 to 90% below the annular fluorescent lamp. The lighting fixture according to claim 1 or 2, characterized by the above.

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