TW492046B - Electrodeless discharge lamp - Google Patents

Electrodeless discharge lamp Download PDF

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Publication number
TW492046B
TW492046B TW90111295A TW90111295A TW492046B TW 492046 B TW492046 B TW 492046B TW 90111295 A TW90111295 A TW 90111295A TW 90111295 A TW90111295 A TW 90111295A TW 492046 B TW492046 B TW 492046B
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TW
Taiwan
Prior art keywords
discharge lamp
mm
electrodeless discharge
coil
patent application
Prior art date
Application number
TW90111295A
Other languages
Chinese (zh)
Inventor
Robert T Chandler
Jakob Maya
Oleg Popov
Edward Shapiro
Original Assignee
Matsushita Electric Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to US56956600A priority Critical
Application filed by Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Application granted granted Critical
Publication of TW492046B publication Critical patent/TW492046B/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/048Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil

Abstract

An electrodeless discharge lamp with a high lamp efficacy is provided. An electrodeless discharge lamp 100 includes: an envelope 1 filled with a discharge gas; a coil 8 for generating an electromagnetic field in the envelope 1; and a protuberance formed on the envelope 1 so as to protrude toward the outside of the envelope 1. A bulb wall loading of the electrodeless discharge lamp 100 is 0.05 W/cm<SP>2</SP> or greater. The envelope 1 may have a reentrant cavity 2, and the coil 8 may be located inside the reentrant cavity 2.

Description

492046 A7 B7 V. Description of the invention (Technical scope) The present invention relates to electric lamps, in particular to electrodeless fluorescent lamps operating at low and medium voltages operating at frequencies from 50 kHz to 1 MHz. Background technology is in the tens of kHz to The lifetime of electrodeless fluorescent lamps operating in the frequency range of tens of megahertz is longer than that of conventional fluorescent lamps with internal electrodes and heating filaments. The electrodeless small fluorescent lamp was recently asked by Qiwei Electric Co., Ltd. Genura) &quot;) is mainly for indoor use. This lamp has a light output of 1100 lumens at a total power of 23 watts and a long service life of 15,000 hours. In order to provide high light output at low and high ambient temperatures, the lamp uses a bismuth-indium alloy amalgam to maintain a large temperature range of about 70 ° C to about 120 ° C. The ideal mercury vapor pressure is about 6 millitorr (about 798 millitons) Pa). The disadvantage of this type of lamp is that the starting time of the lamp is quite long, and the time required to reach the maximum light output of 50% of the lamp is quite long. The starting time for a Genuara lamp is greater than 80 seconds. The reason for the long start time is to heat the amalgam to about 701: the time required for the temperature is quite long (about 1 minute). Indeed, in order to provide a high mercury vapor pressure of 3-4 millitorr (399-532 milliPascal), this mercury vapor pressure is sufficient to produce 70-80% of the highest light output of the maximum light output of 6 millitorr, and the amalgam must be maintained at 70 ° C temperature. In order to achieve rapid amalgam heating, the prior art has placed amalgam in different parts of the lamp housing (Borowiec et al. US Patent 5,412,288, Thomas et al. 5,412,289, Borowiec et al. 5,434,482, and Forsdyke et al. 5,789,855) In some cases, the auxiliary amalgam is located in the flag (for example, U.S. Patent No. 5,698,95 to Maya et al., 5,783,912 to Cocoma et al. And 5,841,229 to Borowiec et al.) Or at -4- this paper standard applies China National Standard (CNS) A4 (210 X 297 mm)

Hold

A7 B7

On the vacuum side of the cavity wall directly heated by the discharge amalgam (US Patent 5,767,617 to Wharmby et al., 5,789 to Forsdyke et al., Δ55). However, even the use of two or more amalgams did not reduce the starting time to less than 80 seconds. U.S. Patent Application No. 09 / 435,968, filed on November 8, 1999 (owned by the same assignee as the case in which the priority claim was filed), the inventor describes a method that is relatively low at 100 kHz Radio-frequency-free, compact, non-fluorescent fluorescent lamp. The use of ferrite cores and Utz wires with low resistance provides low coil / core power loss, resulting in high power efficiency of the lamp, "邛 一 邛 = 0.8, and the maximum lamp efficiency of the amalgam of the convex part High. The start time of this kind of lamp is quite long (approximately i minutes) comparable to that of a Ginola lamp. In order to shorten the start time, the inventors used pure mercury drops instead of amalgam. However, it has the shape described in the aforementioned patent application and does not contain Amalgam but using "pure," mercury operated lamps do not have any point on the surface at a stable temperature below 70 ° C. As a result, the mercury vapor pressure for stable operation is higher than 6 mTorr, resulting in low Stable light output The stable light output accounts for about the maximum light output. The purpose of the present invention is to design an inductive coupling power operating at a frequency of about 100 kHz and about 23 watts and generating visible light with a maximum output of about 1650 lumens and its size is not An electrodeless small glory that is larger than a conventional incandescent lamp. Another object of the present invention is to provide a cold spot that controls the vapor pressure of mercury when the lamp is operated bottom-up and bottom-down, resulting in a stable light output of approximately 165 Maximum lumens: a light output of about 90% further object of the present invention to provide a cooling system which may be a temperature "" Ferrite cores to maintain a temperature below its Curie temperature. -5- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 492046 A7 B7 V. Description of the invention () 3 Another object of the present invention is to provide the driver and matching network inside the cooling structure. Surrounding body of the road. Yet another object of the present invention is to provide a cooling structure that maintains the inside of a ceramic enclosure in which a driver and a matching network are located at a low temperature (T &lt; 100 ° c). Another object of the present invention is to provide a small fluorescent lamp directly improved by a 100-watt incandescent lamp, which has comparable dimensions but has far higher efficiency and has a lifespan 5-10 times longer than that of incandescent lamps. Disclosure of the Invention An electrodeless discharge lamp according to the present invention includes: a case filled with a discharge gas; a coil for generating an electromagnetic field inside the case; and a protrusion formed on the case so as to protrude toward the outside of the case, wherein The bulb wall load is 0.05 W / cm2 or more, thus achieving the aforementioned purpose. The housing has a cavity, and the coil system is located inside the cavity. The electrodeless discharge lamp further includes a ferrite core, and the coil can be wound around the ferrite core. The maximum thickness and the minimum thickness of the shell at the convex portion are 0.1 mm or more and 2 mm or less. The height of the protrusions is less than 7 mm. Another electrodeless discharge lamp according to the present invention includes: a case filled with a discharge gas; a coil for generating an electromagnetic field inside the case; and a convex portion formed in the case so as to protrude toward the outside of the case, wherein the inductance of the coil is The coupling power frequency is from 50 kHz or more to 1 MHz or less, thus achieving the aforementioned purpose. The bulb wall load is 0.05 W / cm2 or more. -6- This paper size applies to China National Standard (CNS) A4 (210X 297 mm)

Pack. ΤΓ

Line 492046 A7 B7 V. Description of the invention () 4 The housing has a cavity, and the coil system is located inside the cavity. The electrodeless discharge lamp further includes a ferrite core, and the coil can be wound around the ferrite core. The maximum thickness and the minimum thickness of the shell at the convex portion are 0.1 mm or more and 2 mm or less. The height of the protrusions is less than 7 mm.

Another electrodeless discharge lamp of the present invention includes: a case filled with a discharge gas; and a coil for generating an electromagnetic field in the case, wherein the case has a side wall and a top, and a corner curvature formed by the side wall and the top The radius is 10 mm or less, which achieves the aforementioned purpose. Jingling

The present invention includes an electrodeless fluorescent lamp that includes a glass case containing an inert gas filling with mercury vapor. The top of the housing has a small and thin glass dome, which can be used as a cold spot for mercury vapor when the lamp is operated bottom-up. A glass "skirt" with a few millimeter gap is sealed to the bottom edge of the housing, apparently providing a cold spot during "bottom down" operation. A ferrite core and an inductive coil made of leeds are placed inside the cavity. The cooling structure includes metal (aluminum, copper) tubes placed inside the iron core and ceramic casing. The ceramic casing is bonded to the metal tube with high thermal conductivity material and to the Edison socket. The power driver and matching network are located inside the ceramic enclosure and are powered by the mains power via the Edison socket. Brief Description of the Drawings Fig. 1 is a cross-sectional view of a first embodiment of the present invention showing a small electrodeless fluorescent lamp operating in bottom-up and bottom-down operation. Figure 2 shows an electrodeless fluorescent lamp, which is a modification of the specific embodiment 1 of the present invention. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 492046 A7 B7 V. Description of the invention () 5 Example, in which the skirt is eliminated and a simpler process is obtained. Figures 3-3 C are modified views of the thinned glass dome of the bulb housing, where cold spots controlling the vapor pressure of mercury are formed. Figures 4A-4D are views of a circular ridged raised skirt at the top, bottom, or sides of a glass case. Figures 5A-5C are schematic illustrations of modifications of cold spot angles formed by the electrode-less fluorescent lamp of the second embodiment of the present invention through the top wall and the side wall of the housing. Best Mode for Carrying Out the Invention (Embodiment 1) FIG. 1 shows an electrodeless fluorescent lamp 100 according to Embodiment 1 of the present invention. Referring to FIG. 1, the glass-bubble shell 1 has a cavity 2 and an exhaust pipe 3 is located on the axis inside the cavity 2. The case 1 is filled with a mixed gas of inert filling gas (argon, krypton, etc.) and mercury vapor as a discharge gas. The pressure of the inert filling gas is 50 mTorr to 5 Torr (6650 mPa to 665 Pa). For the electrodeless fluorescent lamp 100, the diameter and height of the casing are 50 mm and 65 mm, respectively. The cavity 2 is sunken from the outside to the inside of the casing 1. The mercury vapor of the casing 1 is maintained by the cold spot temperature on the surface of the casing, where the mercury liquid is condensed to the cold spot after a few hours of operation. The lamp operating in the bottom-down position is located at the gap formed by the inner wall and outer walls 5 and 6 of the skirt portion (first convex portion) 4. After operating the lamp for several hours, the mercury vapor condensed at the bottom of the gap becomes the cold spot of the casing to control the mercury vapor pressure. In the specific embodiment, the "skirt length is 25 mm, the inner and outer diameters are 40 mm and 45 mm, respectively. At the bottom-up position, the coldest position of the bulb is tied to a thin glass dome (No. -8- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Hold

Line A7 B7 V. Description of the invention () Internal surface. In the specific embodiment of Che Fujia, the dome 7 is located in the glass bubble U as shown in FIG. 1. The height h of the dome 7 is 5 mm, the diameter d of the bottom of the dome 7 is about 9 mm, and the glass thickness is about 0.3 mm. The inventor found that when the diameter of the bottom of the dome 7 is less than about 8 mm, the light output is improved because the diameter of the bottom of the dome 7 is small, and the selfishness of the shell 1 can prevent the convection from entering the inside of the dome 7, As a result, this pressure has been controlled to control mercury pressure. The inventors have also discovered that when the diameter of the bottom of the dome 7 becomes significantly larger, the improvement effect by Koshiko decreases. The reason is that the excessive discharge gas enters with convection and Ik enters into the heat, and as a result, the temperature of the cold spot increases. When the diameter of the bottom portion of the dome 7 is larger than 15 mm, the light output improvement effect decreases. The term "convex part" in this specification means that the curvature of the housing 1 along its cross section is changed from negative to positive and then to a negative housing component, where the housing ι contacts the outside of the non-electric light lamp. Here, when the cross section of the housing 1 is a convex surface facing the ffW side of the housing! The curvature of the shell is called ,, positive, and; and when the cross-section of the shell i is convex toward the side of the shell W, the curvature of the shell 1 is called ,, and negative. For example, as shown in Fig. I, the curvature of the shell 由 is changed from negative (part 101) to positive (part ⑽) and then to negative (Shaofen 103). Such a shell! The change in curvature indicates that the convex portion is convex toward the outer side of the casing 1. In the convex portion, the case 1 contacts the outside of the electrodeless fluorescent lamp (the area of the casing ff. The surrounding area is equal to the area when the convex portion is not provided. In this way, the temperature of the convex portion is reduced, and the cold spot temperature is low enough. To obtain the required stable light output. Multi-strand: Coil 8 series ring 9 made of wire (Lizi wire) winding. In a preferred embodiment, the metal wire Λ oxygen wire is No. 40 specification. The iron core has The two-layer, MinE plant, and Ba Yuanwang layer strands each have double strands of 465 turns. Hollow 丨 shaped iron paper size is applicable to China National Standard (CNS) A4 specifications (210X297 male-9-492046 A7 B7 V. Invention Explanation () The 7-body iron core 9 is made of 4 zinc alloys (refer to US Patent Application No. 09 / 303,95 No. 1 by Chamberlain et al., Application date of May 3, 1999 and Chandler et al. No. 09 / Application No. 435,960 dated November 9, 1999 (each case is owned by the same assignee in this case and based on these applications and claims priority right in this case) is set inside the cavity 2. In a preferred embodiment, The ferrite core has a diameter of 15 mm and a length of 55 mm. Because the coil 8 is centered on the ferrite core 9 The coil / ferrite core inductance is larger than the inductance of the coil 8. Therefore, the luminous efficiency of the electrodeless fluorescent lamp 100 is improved. The coil 8 and the ferrite core 9 include a metal tube 10 and a ceramic case 1 1 The cooling structure is maintained below the Curie point temperature (&lt; 22 (TC). The metal pipe 10 is made of metal (copper), which has high thermal conductivity and low induced power loss. The ceramic housing 11 series A high thermal conductivity material is used to glue several pieces of alumina pieces together. The ceramic case 11 is also made of a single piece. The ceramic case 11 is glued to a copper plate 12 and the copper plate is welded to the Edison socket 13. A specific implementation is preferred In the example, the thickness of the ceramic shell wall is 4 mm. Two ceramic spacers 14 and 15 are inserted into the ferrite core 9 to prevent the metal tube 10 from protruding to the outside of the core, thereby reducing the power loss of the copper tube 10. It is preferable to be specific In the embodiment, the ceramic spacers 14 and 15 are 5 mm long. The matching network and the driver (not shown) are located on the printed circuit board 16 inside the ceramic housing 11. The position of the printed circuit board 16 is selected Let the temperature of each component of the driver not exceed 1 0 0 Position C. The main power supply is connected to the driver via the Edison socket 13. The heat generated by the plasma and the induced power (about 3-4 watts) absorbed by the ferrite core 9 are transmitted through the copper tube 10 and the ceramic casing 1 1 Heat transfer to Edison socket-10- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Pretend

A7 V. Description of the invention (1 3, and then transfer heat to the lamp holder (1 in the picture ... A is not sung). Part of the heat passes through the ceramic shell 11 and the outer periphery of the glass skirt 4 by convection; 6 Dissipation. As a result, the internal temperature of the ceramic case 1 where the printed circuit board 16 is located is 25 at an ambient temperature of 25 and the inductive coupling power 23 watt-hours does not exceed 100. (3. The inner surface of the case 1 includes the inner surface of the skirt 4 Jingpei, 丨 ,, and H are compounded with a protective coating 17 and a phosphorous coating 18. A reflective coating 19 (alumina 筌 ip '^, sheep aluminum temple) is located on the inner surface of the cavity 9. In order to reduce visible light transmission through the cavity Inner wall 2, 00 order ?, ^ η Soil concave L 2 The outer wall of the adjacent coil 8 is coated with a reflective coating 20 (alumina, etc.). The electrodeless fluorescent lamp 100 can be bottom-up, bottom-down, and horizontal. Use. Fig. 2 shows an electrodeless labor lamp 200, which is a variation of the specific embodiment r of the present invention. In Fig. 2, elements similar to those in Fig. 1 are marked with the same reference = used in the old and its detailed description is deleted. Electrodeless fluorescent lamp · It has a housing i, a cavity 2, a coil 8 and a ferrite core 9 similar to those of an electrodeless fluorescent lamp 100. Ren does not have a glass skirt 4. When the cold spot is tied to the inner surface of the thinned glass dome 7, the electrodeless fluorescent lamp 200 can be used for bottom-up lamp operation. Various modifications of the thinned glass convex portion as a cold spot Examples are shown schematically in Figures 3a-A. Figures OA-3C each show part of the shape of the housing 22. The housing can be used to replace electrodeless fluorescent lamps 100 (Figure 丨) and 200 (Figure 2). The housing i shown in Fig. 3A is wedge-shaped 21 and is located on the top of the housing 22. The type of glass protrusion used as a cold spot is shown in Figs. 36 and 3 (:). One of the protrusions is cylindrical. 23, the other convex part is spherical 24. The circular deep concave part is to separate the convex part from the heat and wall of the shell, and to improve the contact between the convex part and the surrounding atmosphere, so as to reduce the temperature of the convex part. Figure 4A-4D shows the shell respectively The shape of the body 34, the shell 34 can be used to replace the non-electric paper size applicable to the Chinese National Standard (CNS) A4 specification (21〇: 297 mm)

-11-492046 A7 B7 V. Description of the invention () 9-pole fluorescent lamp 100 (Figure 1) and 200 (Figure 2) housing 1. As shown in Figs. 4A to 4D, the cold spot convex portion may have a circular ridge shape 32, and the circular ridge has a circular gap 3 3 here to form a cold spot. In Figs. 4A and 4B, the circular ridge (convex portion) is located at the top of the case 34, and the ridge (convex portion 32) with the gap 33 can also be located at the bottom and side walls of the case (Figs. 4C and 4D). The operation of the lamp is as follows: the typical inert gas pressure (argon) is about 1 Torr (about 133 Pa) and the inductively coupled power frequency (the AC frequency applied to the coil 8) is about 100 kHz. The AC power from the main power source (60 Hz) is transmitted through the Edison socket 13 to the driver and matching network (not shown) on the printed circuit board 16 inside the ceramic housing 11. An induced voltage at a frequency of 100 kHz is applied to the coil 8 by a matching network. The coil current U generates an induced magnetic field, which in turn generates an RF azimuth electric field Ez inside the housing. The coil 8 thus generates an electromagnetic field inside the housing. When the voltage V is applied to the coil 8. When it reaches 200-300 volts, a capacitive discharge is generated along the cavity wall 2 of the housing. When the induced (azimuth) voltage Vpl from the lamp reaches a voltage value sufficient for the case to sustain the inductive coupling discharge, the coil voltage (Vc) and the coil current (Ic) decrease. This is accompanied by a decrease in reflected power Pref and a sharp increase in plasma brightness. The transition from capacitive discharge to inductive discharge is called lamp startup (lighting). A further increase in the lamp's absorbed power results in an increase in light output and a decrease in the coil's current lm and voltage. The light output of the lamp is not only related to the power P lamp, but also to the mercury vapor pressure, which increases with the temperature of the cold spot 7 (bottom-up operation) or 4 (bottom-down operation). The maximum light output and thus the highest lamp efficiency are achieved when the cold spot temperature is about 44-55 ° C. The result of further increase of the cold spot temperature is -12- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Outfit-machi

492046, the description of the invention (caused by the increase in water pressure and the reduction of the degree of the true family. So when the surface temperature of the lamp is low enough, that is, the times of the mother and the fan, "官 ° 又 置 Project #," The effect is not great. The degree of surface of the lamp is determined by the load of the wall of the bulb. The scattered people found that when the load of the wall of the bulb is .5 watts per square centimeter or more, the effect is only small. When the load of the wall of the bulb is 0.07 watts per square The effect of the convex part increases significantly when the centimeter or more. The bulb wall load is the value obtained by dividing the effective power applied to the coil 8 by the internal surface area of the housing i. Measure the effective power applied to the coil 8, for example, by connecting to the input of the matching network The power meter at the end measures the effective power. In the preferred embodiment ft) and bottom-up operation, the lamp is at the bottom-up position and at a frequency of 1 (kHz) and a power of 23 watts (163 lumens, η). The spoon's maximum Gwangju output is due to the maximum light output when the temperature outside the thin glass dome 7 is at it. After 2 hours of continuous burning, the lamp reaches a stable light output. The stable light output at 23 watts is 1515 lumens (66 () and cold The temperature at point 7 is me. The stable light output of the lamp according to the present invention accounts for 93% of the maximum luminous output i 6 3 0 lumens. It is found that a small fluorescent lamp without a cup without a special design glass has a low stable light output, and the fixed light output only accounts for 80-85% of the maximum light output. The wall load of the bulb is 0 1 watt / cm2. The starting measurement of the lamp constructed according to the present invention shows that the lamp reaches 50% of the maximum light output 2 to 3 seconds after the lamp is started. It is known that the small fluorescent lamp with electrodes is short. The inventor found that the higher the height h of the glass dome 7, the lower the temperature and the light output of the lamp. However, the inventor found the glass shown in Figs. 3A-3C ^ 4A-4D The dome 7 and other protrusions should not be too large due to its beauty and strength. It is preferable that the slope of the dome 7 is less than 7¾ meters. Other protrusions shown in Figures 3A-3C and 4A-4D # -13-

492046 A7 B7 V. Description of the invention () 11 It is better to have a height less than 7 mm. In addition, the inventors found that the cold spot temperature of the convex portion can be reduced to below 40 ° C. When the thickness of the case 1 is too small, the strength of the convex portion decreases. When the thickness of the case 1 is too large, the cold spot temperature cannot be sufficiently reduced. The maximum thickness and the minimum thickness of the convex portion of the housing 1 are preferably 0.1 mm or more and 2 mm or less, respectively. The inductively coupled power frequency of the electrodeless fluorescent lamp to which the present invention is applied is not limited to 100 kHz. However, when the frequency of inductively coupled power is too low, electrodeless fluorescent lamps are not easy to start. When the inductively coupled power frequency is too high, the cost of the driver increases, so the cost of preventing electromagnetic interference (EMI) also increases. In view of this, the frequency of the inductively coupled power of the electrodeless fluorescent lamp is preferably 50 kHz or more and 1 million Hz or less. The ferrite core 9 can be deleted. However, it is preferred to use a ferrite core 9 when the electrodeless fluorescent lamp is operated at a relatively low inductively coupled power frequency of 50 kHz or more to 1 MHz or less. The reason is that when an electrodeless fluorescent lamp is operated at a low-inductance coupled power frequency, the induced voltage Vpl introduced into the lamp is reduced, and such a reduction must be compensated with a ferrite core 9. In the case where the ferrite core 9 is used, when the electrodeless fluorescent lamp is driven, in addition to the Joule heat generated by the coil 8, heat is generated due to the wear (iron loss) of the ferrite core 9, so the heat generation is increased. . Thus, although the ferrite core 9 is cooled by a cooling structure including the metal pipe 10 and the ceramic casing 11 during operation, the temperature of the ferrite core 9 rises to about 200 ° C. When the electrodeless fluorescent lamp is operated in a bottom-up position, the cold spot is located at a point on the top of the lamp away from the electric plasma. It can be seen from FIG. 1 that the lamp top is located on the top of the ferrite core 9 (near the ceramic spacer 14). Therefore, the top of the lamp is affected by heat transfer from the ferrite core 9, and the temperature of the top of the lamp rises. So especially for the use of ferrite core 9 -14- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Outfit

492046 A7 B7 5. In the example of the invention description (12), it is preferable to provide a convex portion to the housing 1 to provide a cold spot. (Embodiment 2) Figs. 5A to 5C each show the shape of a case 44 which can be used for an electrodeless fluorescent lamp according to Embodiment 2 of the present invention. According to the first embodiment of the present invention, the casing 44 can be used instead of the casing 1 of the electrodeless fluorescent lamp 100 (Fig. 1). The electrodeless fluorescent lamp according to the specific embodiment 2 of the present invention has the same structure as the electrodeless fluorescent lamp 100, except for the case 44. The entire electrodeless fluorescent lamp according to the specific embodiment 2 is not shown in this figure. The thin ventilation tube inside the cavity 2 is not shown in Figs. 5A to 5C. 5A-5C, the cold spot 43 is located at the corner 42 formed by the top 46 and the side wall 45 of the housing 1. It was found that when the radius of curvature r of the corner 42 is 10 mm or less, as shown in FIG. 5A, the temperature drop effect of the cold spot 43 is obtained. A more preferable radius of curvature Γ is 8 mm or less because the effect of lowering the temperature of the cold spot 43 becomes higher when the radius of curvature is 8 mm or less. Note that in order to obtain a larger inductive coupling power, it is better to reduce the radius of curvature 俾 to obtain the predetermined effect. Thus, the electrodeless fluorescent lamp according to the specific embodiment 2 of the present invention has a corner 隅 having a radius of curvature of 10 mm or less. It replaces the electrodeless fluorescent lamp of the specific embodiment 1 (FIG. 1 electrodeless fluorescent lamp 100 and FIG. 2). Projection of electrodeless fluorescent lamp 200). The horned owl formed by the top and side walls of the shell has a “mushroom” shape, and its angle is much less than 90 degrees (Figure 5B). The radius of curvature of the corners must not be 10 mm or less around the entire periphery of the shell. The envelope shape is irregular and has no azimuthal symmetry, as shown in Figure 5C. The corners 42 formed by the top and side walls of the housing also have no azimuthal symmetry. The electrodeless fluorescent lamp according to the specific embodiment 2 is similar to the specific embodiment 1 -15-This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm)

Pretend

492046 A7 B7 V. Description of the invention () 13 Electrodeless fluorescent lamp operation. The principle of the present invention is not limited to non-board fluorescent lamps. For example, according to the aforementioned operating principle, the present invention can be applied to an electrodeless discharge lamp, in which the phosphor coating 18 is not applied to the inner wall of the casing 1 (Figs. 1 and 2) and the light generated by the discharge directly exits the outside of the casing 1. The application of the present invention is not limited to electrodeless discharge lamps without amalgam. Even if an amalgam-free electrodeless discharge lamp is used, when the amalgam contains a high proportion of mercury, the effect of the projections or corners to lower the cold spot temperature increases. The present invention is applicable as long as the discharge gas contained in the case of the electrodeless discharge lamp contains mercury vapor. In addition, any vaporizable metal can be used in place of or in addition to mercury. Obviously, many changes and modifications can be made in the essence and scope of the present invention, but the present invention is limited only by the scope of the accompanying patent application. Industrial Application The electrodeless fluorescent lamp according to the present invention is formed of a housing, and a convex portion of the housing protrudes toward the outside of the housing. With this structure, the temperature of the convex portion is reduced so that the lamp efficiency is improved. -16-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Pretend

Claims (1)

  1. 492046 8 8 8 8 AB c D 6. Scope of patent application 1. An electrodeless discharge lamp comprising: a casing filled with a discharge gas; a coil for generating an electromagnetic field in the casing; and a convex portion formed on the casing facing The outer side of the housing is raised, and the wall load of the bulb is 0.05 W / cm 2 or more. 2. For an electrodeless discharge lamp according to item 1 of the patent application, wherein the housing has a cavity, and the coil system is located inside the cavity. 3. For example, the electrodeless discharge lamp of the first patent application scope further includes a ferrite core, wherein the coil is wound around the ferrite core. 4. For the electrodeless discharge lamp according to item 1 of the scope of patent application, the maximum thickness and minimum thickness of the shell on the convex part are 0.1 mm or more and 2 mm or less, respectively. 5. For an electrodeless discharge lamp according to item 1 of the patent application, wherein the height of the convex portion is less than 7 mm. 6. An electrodeless discharge lamp comprising: a case filled with a discharge gas; a coil for generating an electromagnetic field in the case; and a convex part formed on the case and protruding toward the outside of the case, wherein the inductive coupling power of the coil is The frequency is 50 kHz or more to 1 million Hz or less. 7. For the electrodeless discharge lamp of item 6 of the patent application, wherein the bulb wall load is 0.05 W / cm2 or more. 8. For an electrodeless discharge lamp according to item 6 of the patent application, wherein the housing has a cavity, and the coil system is located inside the cavity. -17- The size of this paper is applicable to Chinese National Standard (CNS) A4 (210 X 297 mm) 492046 8 8 8 8 AB c D 6. Application scope of patent 9. For the electrodeless discharge lamp of item 6 of the scope of patent application, It further includes a ferrite core, in which the coil is wound around the ferrite core. 10. For the electrodeless discharge lamp according to item 6 of the patent application, wherein the maximum thickness and the minimum thickness of the shell on the convex portion are 0.1 mm or more and 2 mm or less, respectively. 11. For an electrodeless discharge lamp according to item 6 of the patent application, wherein the height of the convex portion is less than 7 mm. 12. An electrodeless discharge lamp comprising: a case filled with a discharge gas; and a coil for generating an electromagnetic field inside the case, wherein the case has a side wall and a top, and an angle formed by the side wall and the top The radius of curvature of 隅 is 10 mm or less. -18-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)
TW90111295A 2000-05-12 2001-05-11 Electrodeless discharge lamp TW492046B (en)

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