JP4737100B2 - Electrodeless discharge lamp apparatus and lighting apparatus - Google Patents

Description

  The present invention relates to an electrodeless discharge lamp device and a lighting fixture using the same.

  2. Description of the Related Art Conventionally, an electrodeless discharge lamp is known in which a high frequency electromagnetic field is applied to a discharge gas sealed in a light-transmitting bulb so that the discharge gas is excited to emit light. This type of electrodeless discharge lamp has features such as small size, high output, and long life.

  FIG. 2 shows the configuration of an electrodeless discharge lamp. As shown in FIG. 3, a coil 6 is provided with a coupler that generates a high-frequency electromagnetic field and excites the discharge gas in the bulb 1. The coupler is a device that generates a high-frequency electromagnetic field and excites the discharge gas in the bulb 1. The coupler 11 is formed in a substantially cylindrical shape as a whole, and has a core 11 around which a coil 6 is wound, and is covered with the core 11. A cylinder 12 is provided which is partially inserted into the space and thermally connected to the core 11 and radiates heat generated in the core 11. A flexible resin 14 is filled between the core 11 and the cylinder 12. As shown in FIG. 4, this coupler is inserted into a cavity 3 of an electrodeless discharge lamp having a bulb 1 in which a discharge gas is sealed.

In the dimming of such an electrodeless discharge lamp, the frequency of the high frequency power to be supplied is alternately switched between the frequency at which the electrodeless discharge lamp is lit and the frequency at which the electrodeless discharge lamp is lit, and the ratio of the switching is adjusted to adjust the light output. It is common to use a dimming method that increases or decreases (see, for example, Patent Document 1).
JP 2000-353600 A

  However, when the electrodeless discharge lamp is dimmed by the above-mentioned dimming method using the coupler of the prior art, the level is unacceptable as general illumination of about 45 dB at a distance of 20 cm from the bulb at 50% dimming. It was found that noise was generated.

  Regarding the reason for the generation of noise, looking at the voltage waveform of the induction coil in the dimming method described above, a steep voltage rise such as a surge voltage occurs at the time of relighting at the time of frequency switching. It is thought to do. Furthermore, it has been found that the core 11 and the cylinder 12 are actually in direct contact with each other when the flexible resin 14 is sandwiched and extruded between the core 11 and the cylinder 12 as shown in FIG. For this reason, it is considered that the vibration of the above-described core 11 propagates directly to the cylinder 12 and results in a larger noise.

  The present invention has been made in view of the above points, and an electrodeless discharge lamp device capable of reducing noise generated during operation even when a dimming method using periodic frequency switching is used, and a lighting fixture using the same The purpose is to provide.

  In order to achieve the above object, the invention of claim 1 is provided with high-frequency power supplied in the vicinity of an electrodeless discharge lamp having a bulb 1 in which a discharge gas is sealed, as shown in FIG. An electrodeless discharge lamp apparatus including a coupler that generates a high-frequency electromagnetic field to excite the discharge gas, wherein the coupler is formed in a substantially cylindrical shape as a whole, and a core 11 around which a coil 6 is wound. And a cylinder 12 partially inserted into the space covered by the core 11 and connected to the core 11 in a heat transfer manner to dissipate heat generated in the core 11, as shown in FIG. The silicone sheet 13 is partially affixed to the outer surface of the cylinder in the radial cross section of 12, and the cylinder 12 and the core 11 are in contact with the part where no other silicone sheet 13 is affixed. Flexible resin 14 is characterized in that it has to be filled.

  According to a second aspect of the present invention, there is provided a lighting fixture comprising the electrodeless discharge lamp device of the first aspect and an electrodeless discharge lamp lighting device for supplying high frequency power to a coupler.

  According to the first aspect of the present invention, the silicone sheet is partially affixed to the outer surface of the cylinder in the radial cross section of the cylinder, and the flexibility of adhering the cylinder and the core to the part where no other silicone sheet is affixed. Since the resin is filled, there is no direct contact between the core and the cylinder, and the vibration of the core can be prevented from propagating to the cylinder.

  According to the second aspect of the present invention, it is possible to provide a luminaire that can reduce noise generated during operation even when a dimming method using periodic frequency switching is used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing the overall configuration of the electrodeless discharge lamp apparatus of the present invention. This electrodeless discharge lamp device includes a bulb 1 which is a light-tight glass-made airtight container filled with a discharge gas, an exhaust pipe 2 for evacuating the bulb 1, and a concave cavity provided in the bulb 1. A high-frequency electromagnetic field generating means that is inserted into the cavity 3 as a part and excites the discharge gas to emit light. The high-frequency electromagnetic field generating means supplies a high-frequency current to the coupler, which is an induction coil device that generates a high-frequency electromagnetic field in the plasma generation region in the discharge space by energizing the high-frequency current and excites the discharge gas. It consists of a lighting device.

  FIG. 3 is a cross-sectional view showing the configuration of the coupler of the electrodeless discharge lamp apparatus of the present invention. The coupler has a resin bobbin 7 that can be mounted on a cylinder 12 made of a heat conductor and supports the core 11 and the coil 6. The resin bobbin 7 has an upper flange 7a, a columnar portion 7b, and a lower flange 7c. When the core 11 is substantially in contact with the cylinder 12 and the part located in the back of the cavity 3 is the upper part of the coupler and the part located in the opening of the cavity 3 is the lower part of the coupler, the upper part of the coupler is a substantially donut-shaped upper rod 7a. Further, at least two or more columnar portions 7b extending from the upper flange 7a toward the lower portion of the coupler, and a cylindrical lower rod 7c that supports the columnar portion 7b and extends to the lower portion of the coupler are provided. The core 11 and the coil 6 are supported by the resin bobbin 7.

  FIG. 4 is a cross-sectional view showing the configuration of the bulb of the electrodeless discharge lamp apparatus of the present invention. The valve 1 and the cavity 3 are joined by a sealing portion 9, and a base 10 as a resin fitting member is provided at a lower portion of the valve for fixing the valve 1 and the coupler. The coupler shown in FIG. 3 is inserted into the cavity 3 of the bulb 1 shown in FIG. 4, and high frequency power is supplied to the coil 6 of the coupler, whereby the discharge gas inside the bulb is excited at high frequency and emits light.

  In the present embodiment, as shown in FIG. 1, the silicone sheet 13 is partially attached to the outer surface of the cylinder 12, and the cylinder 12 and the core 11a, It is characterized by being filled with a flexible resin 14 for adhering 11b.

  There are three roles of the silicone sheet 13. The first is a spacer for preventing the cores 11a and 11b and the cylinder 12 from being in direct contact with each other, and the second is as a vibration isolating material that absorbs the vibration of the cores 11a and 11b. The third role is to improve thermal conductivity.

  The flexible resin 14 has two roles. The first is to bond the cores 11a and 11b and the cylinder 12, and the second is to fix the cores 11a and 11b by bonding the cores 11a and 11b to the cylinder 12. This is the role of reducing vibration. Therefore, noise generated during operation due to all these synergistic effects can be greatly reduced.

  When assembling the coupler, the silicone sheet 13 is disposed so that the silicone sheet 13 is wound around the outer surface of the cylinder 12, and a flexible resin 14 is applied to a portion where the silicone sheet 13 is not attached to the cylinder 12. By adhering and fixing the cores 11a and 11b, the cylinder 12 and the cores 11a and 11b are spaced apart from each other.

  Table 1 shows the measurement results of the noise level when the electrodeless discharge lamp is dimmed using the coupler configured as described above.

  In addition, the electrodeless discharge lamp used for this measurement has a rated output of 50 W and is dimmed so that the output is 25 W (50% dimming) at the time of measurement. The noise level is measured 20 cm from the overhead of the bulb. Done at a distance. Table 1 also shows the measurement results of the temperatures of the cores 11a and 11b at the rated output (measured in an environment where the ambient temperature of the valve is 60 ° C.) together with the noise level.

  As shown in Table 1, there is an effect of reducing the noise level by 20 dB or more compared to the case of using the conventional coupler (44.2 dB). However, as the thickness of the silicone sheet 13 in the radial direction increases, the noise level is reduced while the temperatures of the cores 11a and 11b are increased.

  However, since the silicone sheet 13 is a member having a high thermal conductivity, the temperature of the cores 11a and 11b can be suppressed by an increase of about 4 ° C. compared to the conventional coupler even when the interval of 0.5 mm is provided. This temperature rise is in a range where the coupler performance can be sufficiently guaranteed.

  Further, even if the silicone sheet 13 is pasted as shown in FIG. 5, the noise is reduced as in FIG.

  Furthermore, as shown in FIG. 6 and FIG. 7, even if a few points are attached in the axial direction of the cores 11a and 11b, there is an effect of reducing noise. Connected. 1 and 5 show a cross-sectional structure perpendicular to the axis of the cylinder 12, while FIGS. 6 and 7 show a cross-sectional structure parallel to the axis of the cylinder 12.

It is sectional drawing which shows the principal part structure of Embodiment 1 of this invention. It is sectional drawing which shows the whole structure of the electrodeless discharge lamp apparatus of this invention. It is sectional drawing which shows the structure of the coupler of the electrodeless discharge lamp apparatus of this invention. It is sectional drawing which shows the structure of the valve | bulb of the electrodeless discharge lamp apparatus 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 the principal part structure of Embodiment 3 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 principal part structure of a prior art example.

Explanation of symbols

11 Core 12 Cylinder 13 Silicone sheet 14 Flexible resin

Claims (2)

An electrodeless discharge lamp apparatus comprising a coupler that is disposed in the vicinity of an electrodeless discharge lamp having a bulb in which a discharge gas is enclosed and is supplied with high frequency power to generate a high frequency electromagnetic field to excite the discharge gas. The coupler is formed in a substantially cylindrical shape as a whole, and a coil is wound around the outer periphery, and a part of the coupler is inserted into a space covered by the core to be thermally connected to the core. And a cylinder that dissipates heat generated in the cylinder, and a silicone sheet is partially affixed to the outer surface of the cylinder in the radial cross section of the cylinder, and a cylinder and a core are attached to a part where no other silicone sheet is affixed. An electrodeless discharge lamp device characterized by being filled with a flexible resin to be bonded. A lighting fixture comprising: the electrodeless discharge lamp device according to claim 1; and an electrodeless discharge lamp lighting device for supplying high-frequency power to a coupler.

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