JP2006222058A - Incandescent lamp and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with a problem of a shortened life due to arc generation in an electric bulb with efficiency and life improved by dint of xenon sealed in. <P>SOLUTION: In the electric bulb with xenon sealed in a glass bulb by 70 to 95 volume percent, a filament 6 is arranged in the glass bulb 1 so that a distance (A) between both ends of the filament 6 be 5 to 20 mm, a distance (B) between a filament support part 6T and a connection part 7L of a filament end part be 7 to 10 mm, a shortest distance (C) between the center of a luminous part 6C of the filament and the glass bulb 1 be 12 to 16 mm, and a smallest angle (θ) made by the luminous parts 6C of the filament be 25 to 120°. With this, temperature of the glass bulb is prevented from rising too high, reducing risks of its deterioration. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an incandescent bulb and a lighting device.

  In the light bulb, a coiled filament wound with a tungsten wire is energized to emit light. The higher the temperature of the filament, the higher the luminous efficiency. However, the higher the temperature, the more the tungsten's evaporation evaporates, and the filament gradually fades and becomes thinned. It reaches.

  Therefore, in order to suppress the evaporation of tungsten in the filament to increase the luminous efficiency and extend the lifetime, nitrogen is enclosed in an ordinary bulb with an inert gas such as argon. The inert gas sealed in the bulb also has a lower thermal conductivity and a lower tungsten evaporation as the atomic weight increases. Therefore, the main component of krypton is replaced with the main component of krypton instead of the main component of argon. Encapsulated and further improved luminous efficiency and longer life.

  It is known that if the light emission characteristics (lifetime characteristics) obtained in the above are the same, the bulb volume in which an inert gas having a larger atomic weight is sealed can reduce the volume of the bulb and reduce the amount of gas sealed. This is described in, for example, Patent Document 1 and Patent Document 2, and it is disclosed that good light emission characteristics and lifetime characteristics can be obtained.

Furthermore, for the purpose of providing a light bulb capable of improving the light emission characteristics and life characteristics or miniaturizing the bulb and a lighting device equipped with the light bulb, a heat ray absorbing film is formed on the surface of the bulb bulb enclosing xenon as disclosed in Patent Document 3. There is disclosed a light bulb comprising:
JP-A-4-138654 Japanese Patent No. 3419793 Japanese Patent Laid-Open No. 10-55785

  However, xenon has a low ionization voltage, and there is a problem that when the amount enclosed in the glass tube increases, arc discharge is generated and the filament is easily burnt. Therefore, when injecting xenon gas into an incandescent bulb that is lit by applying a relatively high voltage, other inert gas or rare gas such as nitrogen gas and / or krypton gas is used in combination and It has been recommended to occupy less than about 10% by volume of xenon gas. However, since such a light bulb has a small amount of xenon gas enclosed, it is difficult for the xenon gas to exhibit its desired properties.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an incandescent bulb that does not easily cause an arc discharge even when it is lit by applying a high voltage and exhibits good light output characteristics or lighting life characteristics. And

  The light bulb of the invention according to claim 1 is a glass bulb; a filament having a plurality of light emitting portions in which a tungsten wire is wound in a coil shape and a support portion connected between the light emitting portions; and a filament in the glass bulb An introduction line for supporting the distance (A) between both ends to be 5 to 20 mm; between the light emitting section of the filament so that the distance (B) between the end of the filament and the support section is 8 to 8.5 mm An anchor line for supporting the support portion; and an inert gas containing 70 to 95% by volume of xenon enclosed in a glass bulb.

  In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

  The shape of the glass bulb is not limited to PS type, S type, R type, G type, and the material may be soft glass such as soda lime glass to hard glass such as borosilicate glass or quartz glass. Applicable. Further, the bulb may be subjected to a light scattering treatment such as a silica film. Furthermore, a light diffusion film, a reflective film, a colored film, or the like may be formed on the surface of the glass bulb as necessary.

  The filament has at least two light emitting portions formed by winding a tungsten wire in a coil shape. Between the light emitting portion and the light emitting portion, the light emission formed by the same tungsten wire as the light emitting portion hardly contributes to A support portion called “flying” is formed. The filament is disposed in a non-linear shape in the bulb by supporting the support portion on the anchor wire and supporting both end portions on the lead-in wire. In particular, when there are two light emitting portions, the light emitting portions are supported so as to be substantially V-shaped. The light-emitting part is a part that is wound in a single, double, or triple coil shape, and becomes hot when energized, and emits incandescent light, and the support part is wound more loosely than the light-emitting part. The temperature is lower than that, and it hardly emits light even when energized. Thus, a linear distance connecting both ends of the filament supported by the introduction line is defined as A, and a distance between the end supported by the introduction line and the support portion supported by the filament anchor is defined as B.

  When the amount of xenon is small, the action of suppressing the evaporation rate of tungsten is lowered, and at least 70% by volume is necessary. On the other hand, when it exceeds 95% by volume, since the ionization voltage of xenon is low, the arc starting voltage is remarkably lowered and arc discharge is likely to occur. Therefore, the preferable range of the amount of xenon enclosed is 75 to 95%, and the optimum range is 90 to 95%. Since the thermal conductivity of the gas varies depending on the type of inert gas such as krypton, argon, or nitrogen mixed with xenon, the amount of xenon enclosed is selected depending on the type of gas mixed. As an inert gas to be mixed, nitrogen is inexpensive and has the highest ionization voltage and high arc starting voltage, so it is easily mixed.

  The sealing pressure of the gas sealed in these glass bulbs is preferably 65 to 101 kPa (Pascal) at room temperature. If it is less than 65 kPa, the heat retaining effect is impaired, so that the luminous efficiency such as the luminous flux is lowered and the life is shortened. Moreover, when it exceeds 101 kPa, there exists a possibility that it may burst in soft glass, and it is not preferable.

  A light bulb in which xenon gas is sealed is likely to generate an arc discharge particularly near both ends of the filament where the potential difference is large and the temperature is high. For this reason, in this invention, the distance (A) between the both ends of a filament was set so that it might be set to 5-20 mm. When the distance between both ends of the filament is less than 5 mm, arc discharge is likely to occur between both ends of the filament, and when it exceeds 20 mm, the light emitting portion of the filament approaches the glass bulb, and the temperature of the glass bulb rises. The glass bulb may be deteriorated. In addition, the preferable range of distance (A) is 8-15 mm, and the optimal range is 10-12 mm.

  The distance (B) between the end of the filament and the support is 7 to 10 mm, preferably 8 to 8.5 mm. The distance B is the distance between the support part and the connection part when the filament is partially bent and arranged in the bulb in a non-linear manner so that the light emitting part of the filament does not approach the glass bulb too much (there is a plurality of support parts) In this case, it means the distance between adjacent support portions). When the distance (A) between both ends of the filament is 5 to 20 mm, if the distance B is less than 7 mm, the total length of the filament becomes small, so that it is not possible to emit light with a predetermined luminous flux, and the full length of the filament is secured. Even in such a case, since it is necessary to bend the filament a plurality of times, it becomes difficult to dispose the filament having the required light emitting portion length in the glass bulb for a general light bulb. When the distance B exceeds 10 mm, it becomes difficult to dispose the filament in the general bulb glass bulb when the distance A is 5 to 20 mm. In addition, since the temperature rises between the support part and the connection part (between adjacent support parts when there are a plurality of support parts) and the potential difference becomes large, the discharge may be generated. Even in this case, since the distance B is set to 7 to 10 mm, preferably 8 to 8.5 mm, discharge occurs between the support part and the connection part (between adjacent support parts when there are a plurality of support parts). Can be suppressed.

  According to a second aspect of the present invention, in the light bulb according to the first aspect, the ratio B / A between the distance (A) between both ends of the filament and the distance (B) between the end of the filament and the support portion supported by the anchor is 0. It is in the range of 5 to 0.8.

  A light bulb according to a third aspect of the present invention is a glass bulb; a filament having a plurality of light-emitting portions in which a tungsten wire is wound in a coil shape and a support portion connected between the light-emitting portions; a filament in the glass bulb An introduction line that supports the distance (A) between both ends to be 5 to 20 mm; and supports the support portion so that an angle (θ) formed by each light emitting portion adjacent to the filament is 25 to 120 ° An anchor wire; and an inert gas containing 70 to 95% by volume of xenon enclosed in a glass bulb.

  An electric bulb in which xenon gas is sealed is likely to generate an arc discharge in the vicinity where the temperature of the filament is high and the potential difference is large. For this reason, the minimum angle θ formed by each light emitting portion of the filament (in the case of a substantially V-shaped filament formed when there are two light emitting portions, the filament when viewed from a direction perpendicular to the plane formed by the filament) The support portion is supported by the anchor line so that the angle at which the light emitting portions of (2) intersect is 25 to 120 °. If this angle is less than 25 °, the distance between the light emitting portions of the filaments will be short, and arc discharge will easily occur. If the angle exceeds 120 °, the light emitting portion of the filament will approach the glass bulb and the temperature of the glass bulb will rise. The glass bulb may be deteriorated. In the case of a filament having three or more light emitting portions (a plurality of support portions are present), there are a plurality of angles θ, but all the angles θ only need to be 25 to 120 °.

  The light bulb of the invention of claim 4 is a glass bulb; a filament having a light emitting portion in which a tungsten wire is wound in a coil shape and a support portion connected between the light emitting portions; and between both ends of the filament in the glass bulb In an electric bulb comprising: an introduction line for supporting the light source; an anchor line for supporting a support part between the light emitting parts of the filaments; and an inert gas containing 70 to 95% by volume xenon enclosed in a glass bulb. The shortest distance between the center of the light emitting part of the filament and the glass bulb is between 12 and 16 mm.

  Glass bulbs are likely to deteriorate when the temperature continues to be high, and particularly when the temperature is 220 ° C. or higher, moisture in the external atmosphere and the surface components of the glass bulb may chemically react with the surface of the glass bulb, which may cause distortion. . For this reason, the distance between the center of the glass bulb and the filament light emitting portion needs to be 12 mm or more so that the surface temperature of the glass bulb does not become high. Here, the “center of the light emitting part of the filament” is the approximate center of the light emitting part of the filament and indicates the point with the highest temperature. Further, when the distance between the filament and the glass bulb is larger than 16 mm, the size of the glass bulb is increased, or the filament is formed to be substantially flat and the filament mount is likely to be wide and large. For example, in the case of using a PS35 size bulb, the filament must be formed larger than the bulb neck, so that it is difficult to manufacture, and problems such as the filament being easily deformed occur.

  A fifth aspect of the present invention is the light bulb according to any one of the first to fourth aspects, wherein the filament is a double coil, and the ratio (% P) of the secondary coil winding interval to the primary coil diameter of the light emitting part is 140 to It is characterized by 180%.

  When the ratio of the coil winding interval (% P) to the primary coil diameter in the light emitting part of the filament is smaller than 140%, the output of the incandescent light increases, but the temperature of the light emitting part rises excessively, so that the evaporation of tungsten is promoted. Therefore, it is difficult to ensure the life characteristics necessary for a general light bulb (for example, 2000 hours as the lighting time until the filament breaks). If it exceeds 180%, the temperature of the light emitting part of the filament does not rise appropriately, so that it is difficult to satisfy the general power saving characteristics (for example, 13 lm / W) required for a rare gas-filled incandescent bulb.

  The light bulb of the invention of claim 6 is a glass bulb; a tungsten wire having a diameter of 0.02 to 0.08 mm is coiled so that the ratio of the secondary coil pitch to the primary coil diameter of the filament is 140 to 180%. A filament having a light-emitting portion wound twice, an introduction line for supporting the filament so that the distance (A) between both ends of the filament is 5 to 20 mm in the glass bulb, and 65 kPa or more in the glass bulb And an inert gas composed of a mixed gas of 50 to 95% by volume of xenon and 5 to 50% by volume of nitrogen sealed at a pressure of 101 kPa.

  In order to realize high-efficiency lighting without impairing the lamp efficiency of the conventional krypton bulb, it is important to design the coil of the filament together with the composition of the mixed gas mixture, the mixing ratio, and the sealing pressure. In particular, in order to realize a small incandescent bulb, it is necessary to combine a tungsten wire having a predetermined outer diameter and length in a glass bulb with a filament efficiently wound into a double coil shape. As a result of studying the optimum filament based on these matters, the present inventors have determined that the outer diameter of the tungsten wire is 0.02 to 0.08 mm, and the ratio of the secondary winding pitch to the primary winding diameter of the filament is It turned out that it is optimal to set it as 140 to 180%.

  If the diameter of the tungsten wire is less than 0.02 mm, the lamp efficiency is lowered and the strength is lowered. When the diameter exceeds 0.08 mm, the filament size becomes large in order to input a predetermined power, which is unsuitable for downsizing the incandescent bulb.

  When the amount of xenon is small, the action of suppressing the evaporation rate of tungsten is lowered, and at least 50% by volume is necessary. If it exceeds 95% by volume, xenon is not preferable because the ionization voltage is low and the arc starting voltage is lowered. It is preferably in the range of 70 to 95%, optimally 75 to 95%.

The invention of claim 7 is characterized in that in the light bulb according to any one of claims 1 to 6, the glass bulb has an internal volume of 24.0 to 49.0 cm ³ and a rated power of 15 to 100 W. To do.

Although the filament emits light with high efficiency by enclosing the xenon gas, the temperature inside the bulb becomes higher due to the heat retaining effect. When the internal volume of the glass bulb is less than 24.0 cm ³ , it is impossible because the pressure inside the bulb rises excessively and the bulb tends to burst. If the internal volume of the glass bulb exceeds 49.0 cm ³ , high-efficiency lighting due to the heat retaining effect cannot be expected, and the incandescent bulb is enlarged, which is not preferable.

  A lighting device according to a seventh aspect of the present invention includes: a fixture main body; a socket provided in the fixture main body; and the light bulb according to any one of the first to sixth aspects attached to the socket.

  The lighting device allows any lighting device that uses a light bulb as well as a pendant, a bracket, a stand, or the like used in a general home or store.

  According to the first aspect of the present invention, it is possible to provide a light bulb capable of solving the problem of short life due to generation of a problem arc in a light bulb capable of improving efficiency and life by enclosing xenon. Moreover, since the temperature of the glass bulb does not increase too much, the risk of bulb deterioration can be reduced.

  According to the invention of claim 2, a light bulb can be obtained with the optimum value of the effect of the invention of claim 1.

  According to invention of Claim 3, the light bulb which can solve the problem of short life by generation | occurrence | production of an arc can be provided. Moreover, since the temperature of the glass bulb does not increase too much, the risk of bulb deterioration can be reduced.

  According to the invention of claim 4, since the temperature of the glass bulb does not rise too much, the risk of bulb deterioration can be reduced.

  According to invention of Claim 5, in addition to the effect of Claims 1 thru | or 4, the electric light bulb which can solve the problem of the short life by generation | occurrence | production of the arc between coils can be provided.

  According to the invention of claim 6, xenon and nitrogen gas are sealed at a predetermined mixing ratio and sealing pressure, and the filament life of the filament and the coil pitch are optimized, thereby suppressing the short life due to arc generation. However, the lamp efficiency can be improved.

  According to the invention of claim 7, since the internal volume of the glass bulb is optimized and the lamp is turned on with a lamp power of 15W to 100W, the glass bulb bursts at a high temperature during the lifetime without impairing the heat retention effect of the xenon gas. It is possible to provide a light bulb that suppresses this.

  According to invention of Claim 8, the illuminating device which has the effect of Claims 1 thru | or 7 can be provided.

  Hereinafter, an embodiment of the light bulb of the present invention will be described with reference to FIG. FIG. 1 is an enlarged front view showing a general lighting bulb 10, FIG. 2 is an enlarged sectional view of a filament of the bulb of FIG. 1, and an enlarged sectional view of a central portion of the filament of FIG.

  In the figure, reference numeral 1 denotes a PS35 type glass bulb, and 2 denotes a mount having a flare stem 3 sealed at the opening end of the bulb 1. The stem 3 forms a crushing sealing portion 3S in which a pair of lead wires 4, 4, a cane glass 3C and an exhaust pipe (not shown) are hermetically implanted on one end side of the stem tube 3T and the cane glass. It consists of an anchor 5 in which one end of a refractory metal wire such as a molybdenum wire is implanted at the tip of 3C.

  Reference numeral 6 denotes a double coiled filament for 110V60W, which has a double coiled light emitting part 6C in which a single coil 6S around which a tungsten wire is wound is further wound, and a double coiled intermediate part between the light emitting parts 6C. A support portion (flying portion) 6T is formed in which the length of about 1 to 2 turns of the coil-like portion remains the single coil 6S. In addition, leg portions 6L and 6L that are similarly bare wires are formed at both ends of the light emitting portion 6C having a coil shape.

  The double-coiled filament 6 is connected to the hooks formed by bending the tip portions of the lead wires 4 and 4 with the leg portions 6L and 6L at both ends thereof, or connected to the tip portions by means such as welding. In addition, a CC-2 type mount having an inverted V shape in which a loop portion 5R formed on the multi-end side of the anchor wire 5 is wound around an intermediate support portion 6T is formed. That is, the filament 6 has leg portions 6L, 6L made of a single coil 6S and a support portion 6T supported by the connection portions 7L, 7L and the loop portion 5R, respectively. In the case of the present embodiment, the filament 6 has a total length of 23 mm, the light emitting portions 6c and 6c have a length of 11 mm, the tungsten strand diameter is 0.049 mm, and the tungsten strand has a total length of about 502 mm. .

The valve 1 is filled with a mixed gas of 90% by volume of xenon (Xe) inert gas and the remaining nitrogen gas (N ₂ ) at a normal temperature of about 82.6 kPa. Further, the internal volume of the valve is 24.0cm ³ ~49.0cm ^3.

  Reference numeral 8 in the figure denotes a base joined to the sealing portion at the end of the valve 1 via an adhesive or the like, which is connected to the external lead wires connected to the lead wires 4 and 4. The light bulb 10 having the above-described configuration is attached to a socket (not shown) and energized, and the double-coiled light-emitting portions 6C and 6C of the filament 6 connected via the lead wires 4 and 4 emit light at a high temperature. 1 radiates light outside.

  In FIG. 2, A is the distance between both ends of the filament (linear distance between the connecting portions 7L and 7L), and B is the distance between the end of the filament and the support portion 6T supported by the anchor (the connecting portion 7L and the loop). C represents the shortest distance between the center of the light emitting part of the filament and the glass bulb, and θ represents the minimum angle formed by each light emitting part 6c, 6c of the filament.

The values of the valve temperature and the arc generation rate based on these values are shown in the following table, respectively. In addition, the bulb temperature was measured by measuring the highest part of the bulb surface temperature in a state where the bulb temperature was stable 30 minutes after the lamp was turned on. In addition, the presence or absence of arc generation at 150% V or less is confirmed by visually checking the generation of arc when a voltage (150V) of 150% of the rated voltage is input. The voltage was raised every 10 V, and the presence or absence of arcing inside the bulb when the input power was turned on with the lamp set was visually confirmed. When the arc did not occur at an input voltage of 120 V or less, the input voltage when the arc was generated by increasing the input voltage was measured.

In Table 1, h (mm) indicates the shortest distance between the straight line connecting the connection portions 7L and 7L and the support portion 6T. When the distance (A) between both ends of the filament is less than 5 mm, arc discharge occurs at a power supply voltage of 120% of the rated value between both ends (A) of the filament. On the other hand, if it exceeds 20 mm, the light emitting part of the filament approaches the glass bulb, the shortest distance (C) between the center of the light emitting part of the filament and the glass bulb is less than 12 mm, and the surface temperature of the bulb exceeds 230 ° C. Oops. Furthermore, if the distance (B) between the end of the filament and the support is less than 8 mm, the distance between the filament support and the both ends of the filament must be shortened, and arc discharge occurs at a rated power supply voltage of 150%. Will occur. When it exceeded 8.5 mm, the surface temperature of the bulb exceeded 210 ° C. From the above results, it is preferable that A = 12 to 16 mm and B = 8 to 8.5 mm in a range where B / A is 0.2 to 0.8.

  From the above results, when the angle (θ) formed by each light emitting portion of the filament is less than 25 °, arc discharge occurs at a power supply voltage of 150% of the rated value, and when it exceeds 120 °, the center of the light emitting portion of the filament is Since the shortest distance (C) with the glass bulb is less than 12 mm, it has been found that the temperature of the glass bulb rises to 229 ° C.

  Further, it was found that even when the angle (θ) was 25 °, arc discharge occurred at a power supply voltage of 150% of the rated value when the distance (A) between both ends was less than 5 mm.

Next, Table 3 shows the measurement results of the arc generation voltage when the ratio (P2 / d1) of the pitch P2 of the secondary winding 6C to the diameter d1 of the primary winding (single coil 6S) of the filament is changed. Show. The filament has a constant tungsten wire length to obtain a predetermined light output, and the distance (A) between both ends of the filament becomes smaller as P2 / d1 becomes smaller.

  From the above results, when the ratio (% P) of the winding interval of the secondary coil 6S to the coil diameter (diameter of the single coil 6S) in the light emitting portion of the filament becomes smaller than 140%, the distance (A) becomes smaller than 5 mm. As a result, the arc discharge starting voltage is lowered, and arc discharge may occur. In addition, since the temperature of the light emitting portion where (% P) is larger than 180% does not rise appropriately, the light emission efficiency is lowered.

Moreover, when the ratio of the secondary winding pitch is 140 to 150% P and the outer diameter of the tungsten wire is 0.050 to 0.080 mm, the rated life is 4000 h, and the same rated power with conventional krypton gas is included. In comparison, a long-life bulb can be realized. Furthermore, when the ratio of the secondary winding pitch is 151 to 180% P and the outer diameter of the tungsten wire is 0.040 to 0.070 mm, the rated life is equivalent to that of a conventional krypton gas-containing light bulb, and the power consumption However, it is possible to realize a power saving type light bulb that outputs the same total luminous flux while suppressing about 17%. Table 4 shows the characteristics of these bulbs. Each bulb is a clear bulb.

  Furthermore, the volume ratio of xenon gas is preferably 70 to 95%. If it is less than 70%, the lamp efficiency is reduced to 14.3 (lm / w) or less, and if it exceeds 95%, the arc generation voltage is 140 V or less. This is because arc discharge occurs because the arc generation voltage is low. More preferably, an efficiency improvement of 90 to 95% is expected, and there is little risk of arc discharge.

  Further, in the above embodiment, the filament is an example in which the filament is formed in a substantially inverted V shape toward the top of the bulb. However, the filament is horizontally arranged so as to be substantially V-shaped when viewed from the top of the bulb at the substantial center of the bulb. It is also permissible.

  The base 8 is a so-called E-type base of a screw type, and includes a shell portion in which a screw is formed, a top eyelet portion, and an insulating portion that insulates between the shell portion and the eyelet portion, but is mixed with xenon gas. It is preferable that the shell portion of the base 8 is colored in gold instead of the conventional silver so that the consumer can recognize that the lamp is a highly efficient lamp. The shell of the base 8 is made of brass, and the surface of the base 8 looks silvery by nickel plating on the outer surface, but the surface of this nickel layer is 0.01 to 10 μm, preferably 0.01 to 1.0 μm, optimally Can be provided with a gold (Au) plating of 0.05 to 0.5 μm to realize a golden shell in appearance. If the thickness of the gold plating is less than 0.01 μm, the gold color is thin, and it is not preferable because it is not visible. Further, if the thickness of the gold plating exceeds 10 μm, it is not possible because the plating is easily peeled off and the cost increases. The underlayer for gold plating is not limited to nickel, but may be any metal that has conductivity and can be plated.

  Next, an embodiment of the illumination device will be described with reference to FIG. In this embodiment, a vapor bulb 10 is incorporated in the lighting fixture 9 and used. In FIG. 3, 91 is a base body forming a casing, 92 is a socket provided on the base body 91, 93 is a shade attached to the base body 91, a glow part and a reflector, and 94 is a power supply line connected to the socket 92. The base 8 of the light bulb 10 is attached to the socket 92.

  When the lighting device (lighting fixture) 9 having such a configuration is energized through the feeder line 94, the light bulb 10 attached to the socket 92 is turned on. And as above-mentioned, the light bulb 10 has few heat losses of the coiled filament 6, and can obtain a favorable light emission characteristic and lifetime.

It is a partially notched front view which shows the Example of the incandescent lamp of this invention. It is an expanded sectional view of a filament similarly. It is an expanded sectional view of the central part of a filament similarly. It is a partially notched front view which shows the Example of the illuminating device of this invention equipped with the incandescent lamp of FIG.

Explanation of symbols

  10: Light bulb, 1: Glass bulb, 2: Mount, 3: Stem, 4: Lead wire, 5: Anchor wire, 6: Filament, 6C: Light emitting part, 6T: Support part (flying part), 7L: Connection part, 9: lighting device (lighting fixture), 91: base, 92: socket.

Claims (8)

With a glass bulb;
A filament having a plurality of light emitting portions in which a tungsten wire is wound in a coil shape and a support portion provided continuously between the light emitting portions;
An introduction line that supports the distance (A) between both ends of the filament in the glass bulb so as to be 5 to 20 mm;
An anchor line that supports the support portion between the light emitting portions of the filament so that the distance (B) between the end portion of the filament and the support portion is 7 to 10 mm;
An inert gas containing 70-95 vol% xenon enclosed in a glass bulb;
A light bulb characterized by comprising:   The ratio B / A between the distance (A) between both ends of the filament and the distance (B) between the end of the filament and the support supported by the anchor is in the range of 0.5 to 0.8. The light bulb according to claim 1. With a glass bulb;
A filament having a plurality of light emitting portions in which a tungsten wire is wound in a coil shape and a support portion provided continuously between the light emitting portions;
An introduction line that supports the distance (A) between both ends of the filament in the glass bulb so as to be 5 to 20 mm;
An anchor line that supports the support portion so that the angle (θ) formed by the light emitting portions adjacent to each other of the filament is 25 to 120 °;
An inert gas containing 70-95 vol% xenon enclosed in a glass bulb;
A light bulb characterized by comprising: With a glass bulb;
A filament having a light-emitting portion in which a tungsten wire is wound in a coil shape and a support portion provided continuously between the light-emitting portions;
An introduction line that supports both ends of the filament in the glass bulb;
An anchor line supporting a support between the light emitting parts of the filaments;
An inert gas comprising 70-95% by volume xenon enclosed in a glass bulb;
The light bulb is characterized in that the shortest distance (C) between the center of the light emitting part of the filament and the glass bulb is between 12 and 16 mm.   5. The filament according to claim 1, wherein the filament is a double coil, and a ratio (% P) of a secondary coil winding interval to a primary coil diameter of the light emitting unit is 140 to 180%. light bulb. With a glass bulb;
Filament having a light emitting portion in which a tungsten wire having a diameter of 0.02 to 0.08 mm is wound in a coil shape so that the ratio of the secondary coil pitch to the primary coil diameter of the filament is 140 to 180%. When;
An introduction line for supporting the filament so that the distance (A) between both ends of the filament is 5 to 20 mm in the glass bulb;
An inert gas composed of a mixed gas of 50 to 95 vol% xenon and 5 to 50 vol% nitrogen enclosed in a glass bulb at a pressure of 65 to 101 kPa;
A light bulb characterized by comprising: The light bulb according to any one of claims 1 to 6, wherein the glass bulb has an internal volume of 24.0 to 49.0 cm ³ and is lit at a rated power of 15 to 100 W. An instrument body;
A socket provided on the instrument body;
A light bulb according to any one of claims 1 to 7 mounted in the socket;
An illumination device comprising:

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