JPH071600U - Electrodeless discharge lamp lighting device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an electrodeless discharge lamp lighting device capable of preventing a decrease in lamp efficiency, lamp startability, and lamp light amount even when the ambient temperature is low. Constitution: A bulb 1 having a cap portion 6 in which a discharge gas is sealed and a phosphor is applied to the inner surface thereof, a heat insulating cap receiver 2 for supporting the cap portion 6, and a constant temperature heating element 3 for heating the cap portion 6.
And an induction coil 4 wound around the outer periphery of the valve 1, and a high frequency generation circuit 5 for supplying a high frequency current to the induction coil 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrodeless discharge lamp lighting device which has no electrode inside the lamp and discharges and emits discharge gas inside the lamp by a high frequency electric field from the outside.

[0002]

[Prior art]

 Conventionally, there has been provided a fluorescent lamp in which mercury atoms are excited by arc discharge to emit ultraviolet rays, and the ultraviolet rays are applied to the phosphor layer to obtain visible light. , Relatively short life and low efficiency. In order to solve this problem, an electrodeless discharge lamp having a long life and high efficiency has been proposed, and is disclosed in, for example, Japanese Patent Laid-Open No. 57-78766. This lamp is designed so that a high frequency is applied to an induction coil placed in the vicinity of a discharge vessel in which a discharge gas is sealed, and the generated induction electric field causes the discharge gas in the discharge vessel to discharge and emit light.

Further, the electrodeless discharge lamp disclosed in Japanese Patent Laid-Open No. 61-71957 is constructed by winding an induction coil 31 around the outer circumference of a substantially spherical bulb 30, as shown in FIG. A high-frequency generation circuit 32 supplies high-frequency power to the induction coil 31. According to this electrodeless discharge lamp, the light emitting surface area of the bulb 30 is small, that is, it is possible to provide a small and high-intensity light source, and also has the features of long life and high efficiency, and a lighting fixture with a relatively free optical design. Can be provided.

FIG. 4 shows an example of a lighting fixture using an electrodeless discharge lamp. Reference numeral 33 is a surface formed of a conductor for removing radiation noise generated from the bulb 30 and the high frequency generation circuit 32. A box-shaped instrument body having an opening, and 34 is a light-transmitting plate that covers the opening surface (irradiation surface) of the instrument body 33, and is generally a plate glass or a resin lens. Reference numeral 35 denotes a conductive mesh that has a light-transmitting property and prevents noise leakage from the irradiation surface, and it is desirable that this mesh 35 be electrically connected to the instrument body 33. Reference numeral 36 denotes a reflecting plate for effectively emitting the light emitted from the bulb 30 to the irradiation surface. A cap holder 37 for fixing the valve 30 to the instrument body 5 via the reflecting plate 36 is formed near the center of the reflecting plate 36. Has been done.

The luminaire having such a configuration is small, highly efficient, and has a long life. Therefore, the luminaire is expected to be used as an outdoor fixture or a high ceiling fixture whose maintenance inspection is difficult.

[0006]

[Problems to be solved by the device]

 In this luminaire, mercury and argon are generally enclosed in the bulb 30, and ultraviolet rays generated by a high-frequency electromagnetic field are converted into visible light by a phosphor coated on the inner surface of the bulb 30. It is well known that the visible light amount is controlled by the mercury vapor pressure in the bulb 30.

When the lighting device is installed so that the irradiation surface is in the upward or lateral direction, the mercury vapor pressure in the bulb 30 is determined by the temperature of the coldest point inside the base for fixing the bulb 30. . Therefore, the coldest spot temperature of the lamp changes due to the ambient temperature, the volume of the equipment, the heat generation of the circuit, etc., and the light quantity has certain characteristics as shown in FIG.

However, there is no problem if the lighting equipment is used in an environment in which the coldest spot temperature becomes the optimum vapor pressure while lighting, but the lighting time is particularly long when it is used outdoors or in a cold area, or when it is blinking. In the case of a short usage mode, the coldest spot temperature largely deviates from the optimum temperature, and the amount of light is very small, resulting in a significant decrease in lamp efficiency. Further, regarding the startability, similarly, there is a problem that the mercury vapor pressure decreases when used at a low temperature, so that the start-up voltage increases and the startability deteriorates.

In order to solve these problems, there is a method of intermittently controlling the temperature by a heating element (Japanese Utility Model Laid-Open No. 3-22305), but a control circuit is required and the temperature is controlled intermittently. There is a drawback that the cold spot temperature of the bulb 30 is changed and the light quantity of the bulb 30 is also changed. Therefore, an object of the present invention is to provide an electrodeless discharge lamp lighting device capable of preventing a decrease in lamp efficiency, lamp startability and lamp light amount even when the ambient temperature is low.

[0010]

[Means for Solving the Problems]

 The electrodeless discharge lamp lighting device according to claim 1, wherein a discharge gas is enclosed, a fluorescent material is applied to the inner surface of the bulb, and the bulb has a base portion, a heat insulating base receiver that supports the base portion, and the base portion is heated. A constant temperature heating element, an induction coil wound around the outer periphery of the valve, and a high frequency generating circuit for supplying a high frequency current to the induction coil.

According to a second aspect of the present invention, in the electrodeless discharge lamp lighting device according to the first aspect, the constant temperature heating element is disposed inside the base portion and is energized through the base portion.

[0012]

[Action]

 According to the electrodeless discharge lamp lighting device of claim 1, when a high-frequency current is supplied to the induction coil by the high-frequency generation circuit, the discharge gas in the bulb is excited to generate ultraviolet rays, and the ultraviolet rays irradiate the fluorescent material to cause fluorescence. The body glows. In this case, the base is supported by a heat-insulating base and is heated by a constant-temperature heating element.Therefore, the heat of the base does not escape to the reflector, electronic ballast storage case, or other equipment body, and the base is removed. It can heat efficiently and keep the temperature of the base constant. Therefore, the conventional control circuit is not required, the fluctuation of the light quantity due to the change of the ambient temperature is small, and the lamp efficiency and the lamp startability are not deteriorated even when the lamp is used in the environment where the ambient temperature is low. .

According to the electrodeless discharge lamp lighting device of a second aspect, in the first aspect, the constant-temperature heating element is arranged inside the base portion and is energized through the base portion. In addition, the heating efficiency of the base and valve is good, and the power consumption of the constant temperature heating element can be reduced.

[0014]

【Example】

 A first embodiment of this invention will be described with reference to FIG. That is, this electric discharge lamp lighting device has a bulb 1, a cap receiver 2, a constant temperature heating element 3, an induction coil 4, and a high frequency generation circuit 5. The bulb 1 is filled with a discharge gas, the inner surface of which is coated with a phosphor, and has a base portion 6. The base 6 has a light bulb shape and forms a thread groove like a screw base of an incandescent light bulb, and is attached with an adhesive or the like.

The base 2 supports the base 6 and has a heat insulating property. In the embodiment, however, the base 2 is composed of a receiving part 7 into which the base 6 is screwed and a heat insulating material 8, and the base 7 is insulated. It is attached to the reflection plate 9 by the fixture 10 via the material 8. The constant temperature heating element 3 heats the base portion 6. In the embodiment, a positive temperature coefficient thermistor for self-temperature control is used, which is connected to the power source 11 to supply electric power. When a current is supplied to the constant temperature heating element 3, the amount of current to the constant temperature heating element 3 for self temperature control changes so that the self temperature of the constant temperature heating element 3 and the temperature of the base 2 reach thermal equilibrium. The constant temperature heating element 3 and the cap receiver 2 are designed so that the thermal equilibrium temperature becomes the optimum temperature for the valve 1.

The induction coil 4 is wound around the outer periphery of the valve 1, and the high frequency generation circuit 5 supplies a high frequency current to the induction coil 4. In this electrodeless discharge lamp lighting device, when a high-frequency current is supplied to the induction coil 4 by the high-frequency generation circuit 5, the discharge gas in the bulb 1 is excited to generate ultraviolet rays, and the ultraviolet rays irradiate the fluorescent material to cause the fluorescent material to illuminate the fluorescent material. Emits light. Further, when power is supplied to the constant temperature heating element 3 from the power source 11 at the same time as the high frequency generating circuit 5, the constant temperature heating element 3 generates heat and heats the base portion 6 to keep it at a constant temperature.

According to this embodiment, the base 6 is supported by the heat-insulating base 2 and is heated by the constant temperature heat-generating body 3, so that it can be used as a reflector, an electronic ballast storage case, and other equipment bodies. The heat of the base 6 does not escape, and the base 6 can be efficiently heated and the temperature of the base 6 can be kept constant. Therefore, the conventional control circuit is not required, and the fluctuation of the light quantity due to the change of the ambient temperature is small, and the lamp efficiency and the lamp startability are degraded even when the lamp is used in an environment where the ambient temperature is low. There is no.

Further, in the case where this embodiment is used as a lighting device that automatically lights at night, such as a night lighting device, or a lighting device that automatically lights at a set time by a timer or the like. By combining these switches, the constant temperature heating element is energized and the so-called preheating is performed before the lamp is started, enabling instantaneous lighting even when the ambient temperature is extremely low and it is difficult to start the lamp.

A second embodiment of this invention is shown in FIG. That is, in this electrodeless discharge lamp lighting device, the constant temperature heating element 3 is arranged inside the base portion 6 and is energized through the base portion 6. In the embodiment, the constant temperature heating element 3 is arranged around the bottom of the valve 1, and the conductive pin 12 connected to the constant temperature heating element 3 penetrates the base portion 6 and projects. The cap receiver 2 is made of a heat insulating material, and is provided with a pin receiver 13 into which the conductive hinge 12 is inserted, and the pin receiver 13 is connected to the power supply 11.

According to this embodiment, since the constant temperature heating element 3 is arranged inside the mouthpiece portion 6, the heating efficiency of the base portion 6 and the valve 1 is good, and the power consumption of the constant temperature heating element 3 can be reduced. Others are the same as those in the first embodiment. Although the power source 11 dedicated to the constant temperature heating element 3 is used in the above embodiment, it may be connected in parallel to the high frequency lighting circuit 5. In addition, the heat insulating material includes materials that impede heat conduction.

[0021]

[Effect of device]

 According to the electrodeless discharge lamp lighting device of claim 1, since the base portion is supported by the heat-insulating base receiver and is heated by the constant temperature heating element, the base plate can be installed in the reflector plate, the electronic ballast storage case or other equipment body. The heat of the base does not escape and the base can be efficiently heated and the temperature of the base can be kept constant. Therefore, the conventional control circuit is not required, and the fluctuation of the light quantity due to the change of the ambient temperature is small, and the lamp efficiency and the lamp startability are not deteriorated even when used in an environment where the ambient temperature is low. effective.

According to the electrodeless discharge lamp lighting device of the second aspect, in the first aspect, the constant temperature heating element is arranged inside the base portion and is energized through the base portion, so that the effect of the first aspect is achieved. In addition, the heating efficiency of the base and valve is good, and the power consumption of the constant temperature heating element can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a second embodiment.

FIG. 3 is an external perspective view of a conventional valve.

FIG. 4 is a sectional view of the lighting fixture.

FIG. 5 is a graph showing the relationship between the coldest spot temperature of a lamp and the amount of light.

[Explanation of symbols]

 1 valve 2 base receiving part 3 constant temperature heating element 4 induction coil 5 high frequency generating circuit 6 base part

Claims (2)

[Scope of utility model registration request] 1. A bulb having a cap portion which is filled with a discharge gas and which is coated with a phosphor and which has a cap portion, an adiabatic cap receiver for supporting the cap portion, a constant temperature heating element for heating the cap portion, and An electrodeless discharge lamp lighting device comprising: an induction coil wound around an outer circumference of a bulb; and a high-frequency generation circuit that supplies a high-frequency current to the induction coil. 2. The electrodeless discharge lamp lighting device according to claim 1, wherein the constant temperature heating element is arranged inside the base portion and is energized through the base portion.