JP2007227119A - Electrodeless discharge lamp and illumination fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loop-shaped electrodeless discharge lamp device that is superior in light emission efficiency, stability, and size/weight reduction. <P>SOLUTION: This is provided with a loop shaped bulb 1 which is a tube body of a translucent material and in which a discharge gas is sealed, a core 2 comprising a magnetic body to surround one part of the bulb 1, an induction coil wound around at least at one part of the core 2, and a high-frequency power supply (lighting circuit 4) to excite the discharge gas to emit light by electromagnetic induction, by making a high frequency current flow in the coil 3, and a heat-dissipating material 6 is made to divide the core 2 and to be interposed between the core 2 and the core 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrodeless discharge lamp device for exciting and emitting a discharge gas sealed in a bulb by electromagnetic induction, and a lighting fixture using the same.

  Conventionally, as an electrodeless lamp such as a fluorescent lamp or an ultraviolet ray sterilization, Patent Document 1 (Japanese Patent Laid-Open No. 11-191398) discloses a loop-shaped bulb that is a tube of a translucent material and in which discharge gas is sealed. A magnetic core surrounding a part of the bulb, an induction coil wound around at least a part of the core, and a high-frequency power source for exciting and discharging a discharge gas by electromagnetic induction by flowing a high-frequency current through the coil There is disclosed an electrodeless discharge lamp device comprising: In this electrodeless discharge lamp device, for the heat radiation of the core, a structure is used in which the core side surface is surrounded by a metal plate and fixed to the instrument to release the core heat to the instrument.

In Patent Document 2 (Japanese Patent Publication No. 2005-506676), a plurality of cores are divided and arranged inside an electrodeless lamp having a substantially U-shaped cross section, and a heat dissipation material is interposed in the core. Although a structure has been proposed, since the core does not surround the loop valve, heat is not radiated in the outer diameter direction of the core.
JP 11-191398 A JP 2005-506676 Gazette

  In the case of a heat dissipation mechanism that surrounds the side surface of the core with a metal plate and is fixed to the instrument as in Patent Document 1, the heat generated from the core inner diameter portion cannot be effectively radiated. Therefore, power loss due to heat generation of the core increases. Moreover, if the power loss increases at the inner diameter of the core, it will fall into a vicious circle of higher temperatures, causing a thermal runaway of the core. Therefore, in order to suppress the thermal runaway of the core, it is necessary to reduce the magnetic flux density, and it is necessary to increase the core size or shorten or increase the valve size.

  On the other hand, when the core size is increased, the turbulence of light emitted from the bulb to the outside of the bulb increases due to the opaque core itself. As a result, there is a disadvantage that the core itself, which has been increased in size to suppress the thermal runaway of the core, lowers the light emission efficiency. Furthermore, it is thought that the vignetting of light adversely affects the light distribution. In addition, when the core size is increased, the cost of the core material is increased and the size of the lighting device is increased. From the above, it is desirable to make the core size as small as possible.

  In addition, when the bulb size is shortened, the area where light is emitted is reduced, which is considered to adversely affect the light distribution. In addition, if the bulb size is increased, the size of the lighting fixture is increased, which may limit the installation location. From the above, it is desirable to make the valve size as long and thin as possible.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a loop-shaped electrodeless discharge lamp apparatus having good luminous efficiency, stability, small size and light weight. is there.

  According to the electrodeless discharge lamp apparatus of the first aspect, in order to solve the above-described problem, as shown in FIG. 1, a loop-shaped bulb 1 which is a tube of a translucent material and in which discharge gas is enclosed. And a core 2 made of a magnetic material surrounding a part of the bulb 1, an induction coil 3 wound around at least a part of the core 2, and a high-frequency current passed through the coil 3 to generate a discharge gas by electromagnetic induction. A high-frequency power source (lighting circuit 4) for exciting light emission is provided, the core 2 is divided, and a heat radiating material 6 is interposed between the core 2 and the core 2.

  According to claim 2, in claim 1, the cross-sectional shape of the heat dissipation material 6 is T-shaped or L-shaped (FIG. 12).

  According to claim 3, in claim 1 or 2, the heat dissipating material 6 is connected to the instrument 7 as shown in FIGS. 14 to 15.

  In the present invention, since the core is divided and the heat dissipating material is interposed between the cores, the heat generated from the inner diameter portion of the core can be effectively radiated. As a result, thermal runaway of the core can be suppressed, and stable lighting is expected. In addition, the core is expected to be smaller and lighter, light scattering by the core is reduced, and light emission efficiency is expected to be improved.

(Embodiment 1)
As shown in FIG. 1, the electrodeless discharge lamp apparatus according to the present embodiment is a tube 1 made of a light-transmitting material and has a loop-shaped bulb 1 in which a discharge gas is sealed, and a magnet that surrounds a part of the bulb 1. A core 2 made of a body, an induction coil 3 around which at least a part of the core 2 is wound, and a high-frequency power source (lighting circuit 4) that causes a high-frequency current to flow through the coil 3 to excite and emit discharge gas by electromagnetic induction. And the core 2 is divided, and a heat dissipating material 6 is interposed between the cores.

  Here, when the core is divided and a heat dissipation material is interposed between the cores, if the magnetic flux passing through the core is interrupted, the performance as the core deteriorates. Therefore, the magnetic flux passing through the core as shown in FIG. It is necessary to divide the core in a direction parallel to the direction. In this way, by dividing the core in the direction parallel to the direction of the magnetic flux passing through the core and interposing the heat dissipation material between the cores, heat is generated from the inner diameter of the core without reducing the performance as the core. Can effectively dissipate heat. When divided in a direction parallel to the direction of the magnetic flux passing through the core, the performance as the core is not deteriorated regardless of the type of the heat dissipation material interposed between the cores.

  As a result, thermal runaway of the core can be suppressed, and stable lighting is expected. In addition, the core is expected to be smaller and lighter, light scattering by the core is reduced, and light emission efficiency is expected to be improved.

  The bulb 1 has a loop shape and is formed of a translucent material tube (such as a glass tube), and a phosphor is applied to the inside thereof. Further, argon and mercury are enclosed in the bulb 1. Further, an exhaust pipe 9 is provided in the vicinity of the center near the bent portion (folded portion) at the longitudinal end of the bulb 1.

  The core 2 has a toroidal shape, an outer diameter of 63 mm, an inner diameter of 39 mm, and a width of 39 mm. The two cores are symmetrically arranged in the linear tube portion of the valve 1, and each linear tube portion of the valve 1 penetrates a region inside the core inner diameter. (Fig. 3). An induction coil 3 is wound around a part of the core 2, and a lighting circuit 4 is connected to the coil 3.

  The magnitude and phase of the output of the lighting circuit 4, the number of windings and the winding direction of the coil 3 are set so that a discharge is generated and maintained in the bulb 1.

  In the above configuration, when the core 2 is lit without being divided, the core temperature exceeds 180 ° C. in 60 minutes after the lighting, and the core is thermally runaway. However, when the core is divided into three parts and the I-shaped heat dissipating material 6 is interposed between the cores, the core temperature is stabilized at 160 ° C. or lower and thermal runaway does not occur. If power of 150 W is input at that time, the efficiency is about 80 lm / W.

  The same efficiency can be obtained regardless of the position of the valve 1 in which the core 2 is arranged. FIG. 4 shows an example in which the core 2 is arranged in the vicinity of the end portion of the straight tube portion of the valve 1, and FIG. 5 shows an example in which the core 2 is arranged in the vicinity of the bent portion (folded portion) at the end portion in the longitudinal direction of the loop valve 1. is there.

  Furthermore, although the shape of the core 2 is a toroidal shape, as shown in FIG. 6, an E-type core combining the E-shaped core 2b and the I-shaped core 2c, as shown in FIG. As shown in FIG. 8, an EE-type core that is a combination of two cores 2b and an I-type core 2c, as shown in FIG. In addition, the same effect can be obtained when the eyeglass core 2e having a shape surrounding the two straight tube portions of the bulb 1 is used.

  In the above example, the winding position of the coil 3 is the middle foot part sandwiched between the valves 1, but not limited to this, as shown in FIGS. 10 and 11, at least a part of the core 2 is wound. If so, high efficiency can be obtained as well.

(Embodiment 2)
FIG. 12 is a cross-sectional view showing a main configuration of the second embodiment. In Embodiment 1, the core 2 attached to the valve 1 is divided into two or more parts, and the cross-sectional shape of the heat dissipating material interposed between the divided cores is T-shaped or L-shaped. It is characterized by its shape. Thereby, the effect which thermally radiates the heat_generation | fever from a core internal diameter part more effectively is anticipated. Furthermore, the core can be divided into two parts, from three parts to multiple parts, and adhesion between the core and the core, and between the core and the heat dissipation material can be secured.

  In FIG. 12A, the heat radiation material 6a having a T-shaped cross section is used. However, as shown in FIG. 12B, the heat radiation material 6a having a T-shaped cross section and an L shape in cross section. You may use it combining the thermal radiation material 6b of a type | mold. Further, as shown in FIG. 13, the same effect can be obtained when the heat radiation material 6e having an I-shaped cross section is used in combination.

(Embodiment 3)
FIG. 14 is a cross-sectional view showing a main configuration of the third embodiment. In the first embodiment, the core 2 attached to the valve 1 is divided into two or more parts, and the heat dissipating members 6c and 6d interposed between the divided cores are connected to the instrument 7. It is characterized by. 6c is a heat radiating material used for the left and right divided cores, 6d is a heat radiating material used for the upper and lower divided cores, and 7 is an instrument.

  If comprised in this way, the heat radiation from the core 2 to the space in an instrument will be reduced, and the effect which suppresses the raise of an instrument temperature is anticipated. As a result, even when the core 2 is downsized and the core temperature rises, the lamp temperature is kept stable and high luminous efficiency is expected. As shown in FIG. 15, the same effect can be obtained as long as at least a part of the heat radiating members 6 a and 6 d in contact with the core 2 is connected to the instrument 7.

  By mounting the electrodeless discharge lamp device of each of the above-described embodiments on various lighting fixtures, it is possible to realize a small and lightweight lighting fixture with high luminous efficiency and stability.

It is a schematic block diagram of Embodiment 1 of this invention. It is a perspective view for demonstrating the division | segmentation direction of the core in this invention. It is sectional drawing which shows the form of the core used for Embodiment 1 of this invention. It is a schematic block diagram which shows the example of a change of the mounting position of the core in Embodiment 1 of this invention. It is a schematic block diagram which shows the other example of a change of the mounting position of the core in Embodiment 1 of this invention. It is sectional drawing which shows the structure of EI type | mold core used for Embodiment 1 of this invention. It is sectional drawing which shows the structure of the EE type | mold core used for Embodiment 1 of this invention. It is sectional drawing which shows the structure of UI type core used for Embodiment 1 of this invention. It is sectional drawing which shows the structure of the spectacles type core used for Embodiment 1 of this invention. It is sectional drawing which shows the example of a change of the winding position of the coil used for Embodiment 1 of this invention. It is sectional drawing which shows the other example of a change of the winding position of the coil used for Embodiment 1 of this invention. It is sectional drawing which shows the principal part structure of Embodiment 2 of this invention. It is sectional drawing which shows one modification of the principal part structure of Embodiment 2 of this invention. It is sectional drawing which shows the principal part structure of Embodiment 3 of this invention. It is sectional drawing which shows the modification of the principal part structure of Embodiment 3 of this invention.

Explanation of symbols

1 Valve 2 Core 3 Coil 4 Lighting circuit (high frequency power supply)
6 Heat dissipation material

Claims (4)

A tubular body of translucent material, in which a discharge gas is enclosed, a loop-shaped bulb, a core made of a magnetic material surrounding a portion of the bulb, and an induction coil wound around at least a portion of the core; And a high-frequency power source for exciting and emitting a discharge gas by electromagnetic induction by causing a high-frequency current to flow through the coil, and the core is divided and a heat dissipation material is interposed between the cores. Discharge lamp device. 2. The electrodeless discharge lamp device according to claim 1, wherein the cross-sectional shape of the heat dissipating material is T-shaped or L-shaped. 3. The electrodeless discharge lamp device according to claim 1, wherein the heat dissipating material is connected to an instrument. The lighting fixture which has an electrodeless discharge lamp apparatus in any one of Claims 1-3.

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