JP2002042739A - Tungsten halogen lamp and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tungsten halogen lamp capable of preventing halogen from flocculating in the vicinity of an end part within an air tight container to be a conventionally coldest part, preventing an internal lead wire from being fragile or being broken due to corrosion, enhancing vibration proof and shock resistance and improving luminescent efficiency and a lighting system such as a headlight for a vehicle mounted with the same lamp. SOLUTION: These are a tungsten halogen lamp L1 provided with a translucent air tight container 1 having a sealing part 2 formed at an end part, at least a pair of sealing members 31 and 31 sealed within the sealing part 2, internal lead wires 32 and 32 connected with the sealing members 31 and 31, a coiled filament 4 connected between tip parts of the internal lead wires 32 and 32, a heater 5 connected with the coiled filament 4 in parallel between the internal lead wires 32 and 32 and disposed to face the coldest part within the air tight container 1 and halogen and inactive gas filled into the air tight container 1 and a lighting system such as the headlight LH for the vehicle mounted with the lamp L1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen bulb in which a halogen is sealed in a light-transmitting airtight container, and a lighting device using the halogen bulb as a light source.

[0002]

2. Description of the Related Art Halogen lamps contain a small amount of a halogen group element (I, B) together with an inert gas such as argon in an airtight container.
(r, Cl, F) is encapsulated, and the evaporated tungsten is returned to the filament by utilizing a chemical cycling reaction (halogen cycle) between tungsten evaporated from the coiled filament and a halogen group element. It is a high efficiency light bulb.

In this halogen lamp, the internal lead wire may be broken in the vicinity of the base protruding from the sealing portion into the airtight container within a relatively short time after lighting. This is because halogen condenses at the end of the container where the temperature is the lowest during lighting of the bulb, erodes the vicinity of the base of the internal lead wire protruding from this end, causing the crystal structure to collapse and to reduce the diameter. For this reason, it is known that the internal lead wire may be embrittled or broken at an early stage to make the bulb inoperable or to deteriorate the vibration resistance and the shock resistance.

Therefore, as a countermeasure against erosion caused by halogen in the coldest part, a film made of a halogen-resistant substance is formed on the surface near the base of the internal lead wire, or a high melting point metal wire is wound to prevent erosion of the lead wire. For example, a support wire is provided near the base in parallel with the internal lead wire to reinforce the support wire.

[0005] However, when the former film or metal wire is wound, the progress of erosion can be delayed but is not complete. In the latter case, the cross-sectional area of the lead wire is set in advance in anticipation of damage due to erosion. In each case, it is assumed that erosion is unavoidable.

[0006]

Therefore, the present inventor has proposed:
As a result of further investigations and investigations on measures to prevent erosion from halogen near the base of the internal lead wire, halogen was condensed in the container by heating the coldest part generated at the end of the airtight container and raising the temperature. It has been found that it is possible to cause a smooth halogen cycle without performing the process.

The present invention prevents halogen from aggregating in the vicinity of the inner end of an airtight container, which has conventionally been the coldest part, and prevents the internal lead wires from being embrittled or broken by erosion, and having vibration resistance,
It is an object of the present invention to provide a halogen bulb capable of improving impact resistance and improving luminous efficiency, and a lighting device such as a vehicle headlight equipped with the bulb.

[0008]

According to a first aspect of the present invention, there is provided a halogen lamp including a light-transmitting hermetic container having a sealing portion formed at an end portion, and at least a hermetically sealed container inside the sealing portion. A pair of sealing members, an internal lead wire connected to these sealing members and extending into the airtight container, a coiled filament connected between the tips of these internal lead wires,
A heater connected in parallel with the coiled filament between the internal lead wires and disposed facing the coldest part in the airtight container, and a halogen and an inert gas sealed in the airtight container. It is characterized by doing.

[0009] In the claims and the following claims, the technical meanings of the terms are as follows unless otherwise specified.

In this lamp, the heater generates heat when the filament is turned on, and heats the lowest temperature portion in the airtight container, for example, the vicinity of the inner bottom. By this heating, the temperature in the vicinity of the inner bottom becomes about 180 ° C. or higher, and the aggregation of the halogen is eliminated in this portion, and the metal member such as the internal lead wire extending from this portion is not invaded. Also,
Since the temperature in the other part of the container is 180 ° C. or higher, which is higher than the aggregation temperature of halogen, no aggregation of halogen occurs in the container.

[0011] Further, in the conventional halogen bulb, halogen coagulation occurs in the coldest part in the hermetic container, and blackening occurs on the wall of the container at an early stage due to insufficient halogen content.
Although a larger amount of halogen than the predetermined amount is enclosed, according to the present invention, most of the enclosed halogen can contribute to the halogen cycle. Therefore, it is sufficient to encapsulate an appropriate amount of halogen. The productivity is also improved, for example, with less adverse effect of cost and lower cost. The halogen in the hermetic container may be sealed in an element or a compound.

Therefore, in the halogen lamp, the vicinity of the base of the internal lead wire is not eroded by the halogen, so that the halogen lamp is not embrittled or broken.

The power loss due to the provision of the heater is small and does not cause any problem.

A halogen lamp according to a second aspect of the present invention is characterized in that the heater connected between the internal lead wires is disposed near the inner bottom in the airtight container.

[0015] By heating the vicinity of the inner bottom portion, which is the lowest temperature portion in the airtight container, the same effect as in the first aspect is exerted.

Further, the heating heater is not limited to a coil having a high melting point metal wire such as tungsten or molybdenum wound in a coil shape, but may be another heating element which is hardly affected by halogen.

A halogen lamp according to a third aspect of the present invention is characterized in that the rating of the coiled filament is 100 W or less.

In the case of a bulb having a rating of 100 W or more, it is not always necessary to provide a heater because the output of the bulb is large and the temperature inside the container rises when the bulb is turned on.

A lighting device according to a fourth aspect of the present invention includes a reflector and the halogen bulb according to any one of the first to third aspects disposed in the reflector. It is characterized by.

By arranging a halogen bulb having the above-mentioned effects in the reflector, the direct light and the light reflected by the reflector are radiated from the opening of the reflector and the sealing portion. The internal lead wire extending from the inside into the container is not eroded by the halogen.

Further, by providing a light control body such as a front lens in the opening of the reflector, the irradiation direction is regulated by a lens element in which the direct light and the reflected light are carved on the front lens, and a desired light distribution is obtained. A distribution is obtained. Further, a protective cover member may be provided as a light control body to prevent the colored lens and the bulb inside from being damaged.

This lighting device can be widely used for video photography, display lighting, headlights for vehicles such as automobiles, railway vehicles and construction vehicles, and floodlights for factories and construction sites.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a halogen lamp L1 having a rating of 12V55W for a headlight of an automobile.

In the figure, reference numeral 1 denotes a hard glass tube having a cylindrical shape. Here, for example, an airtight container having an outer diameter of about 12.1 mm made of a bulb made of an aluminosilicate glass tube, and 2 is formed at one end of the airtight container 1. The crush sealing portions 31 and 31 are a pair of sealing members made of a molybdenum Mo wire or the like which is hermetically sealed in the crush sealing portion 2. Reference numerals 32, 32 denote internal lead wires made of element wires of molybdenum Mo, tungsten W, or the like connected to the sealing members 31 and 31 and extending substantially in parallel in the hermetic container 1. The internal lead wire 32 may be the same line.) 33, 33 are external lead wires connected to the sealing members 31, 31 and extending almost in parallel outside the airtight container 1.

Reference numeral 4 denotes a coiled filament formed by winding a tungsten W element wire into a perfect circle or an ellipse. The filament 4 includes a coiled light emitting portion 41 and leg portions 42, 42 at both ends. Consists of The filament 4 extends in a direction perpendicular to the tube axis of the hermetic container 1 called a C-6 type connecting line, and the leg portions 42, 42 are welded near the distal ends of the internal lead wires 32, 32. It is connected by hooking.

Reference numeral 5 denotes a coil-shaped heater having a rating of 20 W formed by winding a high-melting metal wire, for example, tungsten W element wire. The legs 52, 52 at the ends are connected to the internal lead wires 32, 32 by welding or the like. The filament 4 and the heater 5 are connected in parallel to the internal lead wires 32.

An inert gas such as argon Ar containing about 400 ppm of halogen (CH ₂ Br ₂ ) is sealed in the airtight container 1.

Although not shown in FIG. 1, a cap such as a BA15d type with a position adjusting ring is joined to the crush sealing portion 2 of the airtight container 1 via a heat-resistant adhesive, and is connected to the terminal portion. The external lead wires 33 are connected to the halogen bulb L1.
Is completed. In the figure, reference numeral 12 denotes an exhaust pipe provided at the other end of the airtight container 1.

The sealing member wire 31 and the inner lead wire 32 are continuous and the same, and are made of a molybdenum Mo wire having a wire diameter of about 0.3 mm. The sealing member wire 31 and the internal lead wire 32 may be separate members.
1 and the external lead wire 33 may be the same line, and the internal lead wire 32 may be a separate two or three part.

With the halogen lamp L1 having the above-mentioned configuration in a horizontal state, a base (not shown) is connected to a socket (not shown).
When the power is supplied to the power supply and the external leads 33, 33, the sealing members 31, 31, the internal leads 32, 32,
Electric current flows through the light emitting portions 41 of the filament 4
Emits light and lights up, and at the same time, a current also flows through the heater 5 connected to the internal lead wires 32, 32, and the heat generating portion 51 generates heat.

When the filament 4 is turned on, the heater 5 generates heat and heats the inner bottom portion 11 in the vicinity of the sealing portion 2 which is the lowest temperature portion in the airtight container 1. By this heating, the temperature near the inner bottom part 11 becomes about 250
° C and halogen aggregation in this part disappears.
Since the temperature in the other part of the container 1 is 400 ° C. or higher, which is higher than the aggregation temperature of halogen, no aggregation of halogen occurs in the container 1.

The heater 5 provided in the airtight container 1
Is not limited to the vicinity of the inner bottom portion 11 and may be disposed facing the coldest portion in the container 1. In the light bulb L1 of the present invention, the airtight container 1
In many cases, the coldest part is the exhaust pipe 12 protruding from the container 1, but since there is no metal member to be eroded in the exhaust pipe 12, there is little possibility that a problem occurs.

Further, in the conventional halogen bulb, aggregation of halogen occurs in the coldest part in the hermetic container, and blackening occurs on the wall of the container at an early stage due to shortage of halogen.
Although a larger amount of halogen than the predetermined amount is enclosed, according to the present invention, most of the enclosed halogen can be contributed to the halogen cycle. Therefore, productivity can be improved, for example, because there is little adverse effect such as erosion and the like, and the cost can be reduced.

Therefore, in the halogen lamp L1, the vicinity of the base of the internal lead wires 32, 32 is not eroded by the halogen and is not embrittled or broken, and the coiled filament 4 is securely and firmly held until the end of its life. Vibration resistance and impact resistance can be improved. Also,
Since the halogen cycle of the halogen sealed in the container 1 can be activated, the quality of the light bulb L1 can be improved, for example, the luminous efficiency can be improved.

The power loss caused by the provision of the heater 5 is small and does not cause any problem.

FIGS. 2 to 4 are front views showing another embodiment of the halogen bulb according to the present invention. In the drawings, the same parts as those in FIG. I do.

The difference between the halogen bulb L2 of FIG. 2 and the halogen bulb L1 shown in the above embodiment is in the direction in which the coiled filament 4 is provided.
The filaments 4 extend in a direction parallel to the tube axis of the hermetic container 1 called a mold connecting line, and therefore internal lead wires 31 having different lengths are used.

The halogen lamp L2 has the same function and effect as the halogen lamp L1.

The halogen lamp L2 and the halogen lamp L1 have different light distribution characteristics when combined with a reflector such as a vehicle headlamp. L1 and L2 are selected and used.

In the halogen lamp L3 shown in FIG. 3, the direction in which the heater 5 extends is parallel to the tube axis of the airtight container 1. In such a direction, even if the inner diameter of the airtight container 1 is small, it is possible to arrange the heater 5 having a predetermined length, and it is possible to widen a heating area of a portion to be the coldest part. The same operation and effect as those of the halogen lamps L1 and L2 described in the embodiment are obtained.

The halogen lamp L4 shown in FIG. 4 is suitable for a case where a high vibration resistance is required, such as for construction.

That is, in the halogen lamp L4, the support members 6, 6 are provided in parallel with the internal lead wires 32, 32 to reinforce the internal lead wires 32, 32. Is connected. (The heater 5 may extend in a direction parallel to the tube axis as shown in FIG. 3.) The support member 6 is made of, for example, the same material as the internal lead 32 and the same outer diameter as Mo. The support member 6 is also included in the category of the internal lead 32 in the present invention.

The support member 6 is constructed, for example, by connecting one end to the internal lead wire 32 by welding or the like, and burying the other end in the glass of the bent sealing portion 2.

The heater 5 connected to the support member 6 which is at the same potential as the internal lead wire 31 when energized generates heat and heats the vicinity of the inner bottom portion 11 to prevent the halogen from aggregating in this portion. The same operation and effects as those of the halogen lamps L1 to L3 described in the above embodiment can be obtained.

FIGS. 5 and 6 are longitudinal sectional views showing an embodiment of the lighting device of the present invention. The illuminating device shown in FIG. 5 is a light bulb with a reflecting mirror used for, for example, video shooting, and the illuminating device shown in FIG. 6 is a headlamp device for a vehicle, for example, and is the same as FIGS. The same reference numerals are given to the portions, and the description thereof will be omitted.

In FIG. 5, reference numeral 7 denotes a reflector formed by molding quartz glass, hard glass, ceramic, heat-resistant synthetic resin, metal, or the like. Reflection surface 7 such as a multilayer optical interference film in which a plurality of layers of titanium TiO ₂ and silicon oxide SiO ₂ are alternately laminated.
1 is formed.

The base 72 on the center rear surface of the reflector 7
, The crushed sealing portion 2 of the halogen lamp L5 including the spherical airtight container 1 made of, for example, quartz glass is accommodated, and the focal point of the reflector 7 and the position of the coiled filament 4 are aligned. After being combined, the two are joined together via a heat-resistant adhesive 74 such as a silicone-based material to form a bulb LR with a reflector.
Is configured.

Incidentally, in the figure, 93, 93 are terminal pins connected to the external lead wires 33, 33 of the bulb L1. Of course, a base may be attached to the base 72. In this case, metal foils 34, 34, such as molybdenum foil, are used as a sealing member in the crush sealing portion 2, and an internal lead wire 32 is provided at one end and an external lead is provided at the other end. The wires 33 are connected by means such as welding.

When power is supplied to the terminal pins 93, 93 of the illumination device comprising the bulb LR with a reflecting mirror, the filament 4 emits light and the heater 5 generates heat, so that the sealing portion 2 at the inner end of the container 1 is heated to 180 ° C. or more. Heat at a temperature of

By the light emission of the filament 4 inside, the direct light and the reflected light incident on and reflected by the reflector 7 are emitted from the opening of the reflector 7.

Then, the coldest part in the airtight container 1 moves to a part other than the inner bottom part 11 due to the heating of the sealing part 2, but the temperature of each part of the container 1 is 180 ° C. or more, and the halogen in the container 1 is Aggregation does not occur, an active halogen cycle is generated, and luminous efficiency can be increased. In addition, the internal lead wires 31, 31 extending from the sealing portion 2 into the container 1 are not eroded by halogen, and vibration is prevented. Device that is strong against shock and impact and does not cause a short life (bulb LR with reflector)
Can be provided.

The headlight device LH shown in FIG. 6 is a combination of a front lens 8 combined with a front opening 76 of a reflector 7, for example, from the rear side of the reflector 7.
2 (BA15 with position adjustment ring (flange) on sealing part 2)
A d-type or the like base 9 is joined. ).

In FIG. 6, the reflector 7 is made of a heat-resistant synthetic resin, metal, or the like, and has a reflective surface (not shown) formed on the inner surface. The container 1 of the bulb L2 is passed through the through hole 73 of the base 72 at the center of the reflector 7 from the rear side, and the position adjusting ring (flange) 91 of the base 9 joined to the sealing portion 2 is connected to the pin 76 of the base 72. The lamp L2 is attached to the reflector 7 by rotating the fitting base 9 in the following manner. In addition, the light bulb L2
Can be removed by turning in the opposite direction to the mounting.

Also in the case of the headlight device LH, when the socket 95 is mounted on the base 9 and the halogen lamp L2 is energized, the filament 4 emits light and the heater 5 generates heat, so that the inner end of the container 1 is heated. The sealing part 2 is heated at a temperature of 180 ° C. or higher. In addition, due to the light emission of the internal filament 4, the direct light from the reflector 7 and the reflected light incident on and reflected by the reflector 7 are directed to the front lens 8, and the irradiation direction is regulated by the lens element engraved on the lens 8. Light is emitted so as to have a predetermined light distribution.

Then, the coldest part in the airtight container 1 moves to a part other than the inner bottom part 11 due to the heating of the sealing part 2, but the temperature of each part of the container 1 is 180 ° C. or more, and the halogen in the container 1 Aggregation does not occur, an active halogen cycle is generated, and luminous efficiency can be increased. In addition, the internal lead wires 31, 31 extending from the sealing portion 2 into the container 1 are not eroded by halogen, and vibration is prevented. A headlight device LH that is resistant to shock and impact and does not cause a short life can be provided.

The headlight device LH can be applied to a structure in which the halogen bulb L2 is mounted with the front lens side opened without mounting from the reflector 7 side.

The present invention is not limited to the above embodiment. For example, the material of the glass tube bulb forming the hermetic container of the electric bulb is not limited to aluminosilicate glass, but can be applied to other hard glass such as borosilicate glass or quartz glass, and the shape is also described in the embodiment. Not exclusively.

On the surface of the airtight container, as shown by a dotted line in FIG. 5, a multilayer optical interference film 15 is formed by alternately stacking a plurality of layers of titanium oxide TiO ₂ and silicon oxide SiO ₂ having different high and low refractive indexes. For example, a halogen lamp having high efficiency may be formed.

The sealing portion formed at the end of the container is
The sealing member formed by shrinking the valve is not limited to the crushing sealing, and the sealing member hermetically sealed in the sealing portion is a wire made of molybdenum Mo or tungsten W depending on the glass material constituting the container. Shapes and foils can be used as appropriate.

Further, the illumination device is not limited to the structure and application shown in the above embodiment, but may be of another structure or application. A protective cover or the like may be used.

[0061]

According to the first aspect of the present invention, the halogen lamp does not cause the vicinity of the base of the internal lead wire to be eroded by halogen, thereby causing embrittlement or breakage. It can be held firmly and vibration resistance and impact resistance can be enhanced. Further, since the halogen cycle of the halogen sealed in the container can be activated, it is possible to provide a halogen bulb having various advantages of improved quality such as improvement of luminous efficiency.

According to the second aspect of the present invention, the same effect as described in the first aspect is exerted by heating the vicinity of the inner bottom portion which is the lowest temperature portion in the airtight container.

According to the third aspect of the present invention, the same effects as those of the first aspect can be obtained by regulating the MG or the rated power of the coiled filament.

According to the fourth aspect of the invention, the same effect as that of the first aspect can be obtained by regulating the amount of halogen to be enclosed.

According to the invention of claim 5, according to claim 1,
Since the halogen lamp having high vibration and impact resistance and improved luminous efficiency according to any one of Items 4 to 4 is provided, it is possible to provide a lighting device (a light bulb with a reflecting mirror) that has a low frequency of bulb replacement and is easy to maintain.

According to the sixth aspect of the present invention, the same effect as described in the fifth aspect can be obtained, and by providing the front lens at the opening of the reflector, direct light and reflected light can be transmitted to the front lens. It is possible to provide a lighting device suitable for a vehicle headlamp or the like in which the irradiation direction is regulated by the engraved lens element and a predetermined light distribution is obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a halogen bulb for a vehicle headlight according to the present invention.

FIG. 2 is a front view showing another embodiment of the halogen lamp according to the present invention.

FIG. 3 is a front view showing another embodiment of the halogen lamp according to the present invention.

FIG. 4 is a front view showing another embodiment of the halogen lamp according to the present invention.

FIG. 5 is a longitudinal sectional view showing an embodiment of a lighting device (bulb with a reflecting mirror) of the present invention.

FIG. 6 is a longitudinal sectional view showing an embodiment of a lighting device (vehicle headlight device) of the present invention.

[Explanation of symbols]

 L1 to L4: halogen lamp LR: lighting device (bulb with reflector) LH: lighting device (vehicle headlight device) 1: glass tube bulb 11: inner bottom 2: sealing portion 31: sealing member 32: inside Lead wire 4: Coiled filament 41: Coiled part 5: Heater 7: Reflector 8: Front lens

Claims (4)

[Claims] 1. A translucent airtight container having a sealing portion formed at an end portion; at least one pair of sealing members hermetically sealed in the sealing portion; and hermetically connected to the sealing members. An inner lead extending into the container; a coiled filament connected between the tips of the inner leads; a coiled filament connected in parallel with the coiled filament between the inner leads, and A halogen lamp comprising: a heater disposed facing a cold part; and halogen and an inert gas sealed in the airtight container. 2. The halogen lamp according to claim 1, wherein the heater connected between the internal lead wires is disposed near an inner bottom in the airtight container. 3. The coiled filament has a rating of 100.
The halogen lamp according to claim 1, wherein the value is not more than W. 4. An illumination device comprising: a reflector; and the halogen bulb according to claim 1 disposed in the reflector.