JP2001068065A - Electric lamp and marker light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric lamp, having enhanced light emission characteristic and also a marker light fitted with the electric lamp and having an enhanced luminous intensity. SOLUTION: This electric lamp L is furnished with a glass bulb 1, having a seal part 2 at the end, a sealing member 3 installed airtightly in the seal part 2, a filament 4 of double coil form having a leg 4L at the end connected with the sealing member 3 and with its middle part wound round in the form of a long circle, and an inert gas encapsulated in the bulb 1, and also, a marker light D is fitted with the electric lamp L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb such as a halogen light bulb used as a light source for traffic signs and the like, and to a sign light equipped with the light bulb.

[0002]

2. Description of the Related Art In a halogen bulb, a trace amount of a halogen group element (I, Br, Cl, F) is enclosed in a glass bulb together with an inert gas such as argon, and tungsten and a halogen group element evaporated from a coiled filament are formed. Utilizing the chemical cycling reaction (halogen cycle) between
It is a small, high-efficiency light bulb that returns evaporated tungsten to a filament.

[0003] There are various types of halogen lamps depending on the application. For a low-pressure, high-current type lamp for a sign or the like, a single-coil filament in which a relatively large-diameter tungsten wire is wound as a filament is used. Is used. The single-coil filament is supported in the bulb by molybdenum foil by directly attaching a linear leg extending in parallel from both ends of the coil or by winding or attaching a metal wire to the leg. The sealing member is fixed to the sealing member of the valve by welding or the like, and the sealing member is hermetically sealed in the sealing portion of the valve.

[0004] Sign lights and the like embedded in roads such as runways and taxiways of airfields do not have a required light distribution evenly distributed in the vertical and horizontal directions. Is not necessary, and irradiates light in a horizontal (horizontal) direction with a certain width.

For this reason, the reflecting mirror in the lamp of the sign lamp is not a bowl-shaped reflector with a bottom but a bowl-shaped one whose upper and lower parts are cut out in the form of a substantially rectangular concave surface.
The coil-shaped filament of the bulb also has a flat shape in order to suppress light emission in the vertical direction, and the flat long diameter surface side faces the reflecting mirror surface.

[0006] Further, this filament 4A is shown in FIG.
With reference to (a) and (b), the shape is such that the coil portion 41 formed by winding a tungsten wire is a single coil and has a flat shape, and the short diameter side is bent into a substantially semicircular shape. 42, the major-diameter surface side has a substantially parallel linear configuration 43, 43, and the curvature of the curved portion 42 is small.
In the figure, reference numeral 44 denotes a leg portion.

[0007] The marker light or the like receives a strong impact when an airplane or a vehicle travels, and the light bulb, which is a light emitting source disposed in combination with a reflecting mirror inside the marker light, is vibrated. As described above, a single-coil filament wound with a tungsten wire having a relatively large diameter has been used as a bulb mounted on a marker lamp or the like so as to withstand the impact or vibration.

[0008]

However, recently, as the speed of an airplane or a vehicle has been increased, it has been required to increase the luminous intensity of a sign lamp or the like because of the need to improve the visibility.

The inventor of the present invention has further studied various means for improving the luminous characteristics of the bulb used for the marker lamp and the like, and for improving the luminous intensity of the marker lamp. It has been found that light emission characteristics can be further improved without occurrence.

[0010] It is an object of the present invention to provide a light bulb capable of improving the light emission characteristics, and a marker light equipped with the light bulb and capable of improving the luminous intensity.

[0011]

According to a first aspect of the present invention, there is provided a light bulb including a glass bulb having a sealing portion at an end, a sealing member hermetically sealed in the sealing portion, and a bulb. Established
It is characterized by comprising a double coil-shaped filament in which an end leg is connected to a sealing member and an intermediate portion is wound into an oval shape, and an inert gas sealed in a valve. .

Since the double coiled filament is provided, the luminous efficiency can be remarkably improved as compared with this type of conventional light bulb using a single coiled filament, and the double coiled filament forming the light emitting portion is provided. Since the part is wound in an elliptical shape, the irradiation of light in the horizontal (left / right) direction with a certain width seen from the extending axis direction of the double coil-shaped part is strong, and Light irradiation can be weakened.

Further, this light bulb can be applied to various uses such as for an optical device, a sign lamp, and a heating.

[0014] A light bulb according to a second aspect of the present invention is characterized in that the entire circumference of the double coil-shaped portion in the middle portion of the filament has an oval shape having a curvature.

Since the double coil-shaped portion is wound in an elliptical shape having a curvature over substantially the entire circumference when viewed from the transverse direction, the double coil-shaped portion has a larger curvature than in the case of a flat shape having a straight portion, and has a single coil-shaped portion. The round pitch interval does not locally become narrow, and the same interval can be obtained in any part. Note that the pitch interval of the coil-shaped portion is narrower on the inner peripheral side than on the outer peripheral side, which causes various inconveniences such as a turn short (short circuit).

That is, when the double coil-shaped portion is formed into a flat shape composed of a straight portion and a curved (curvature) portion, the curvature of the curved portion is small, so that the pitch on the inner peripheral side of the single coil-shaped portion of the curved portion is narrowed ( In this part, pitch irregularity is caused, and the interval between adjacent single coils is narrowed. In extreme cases, adjacent turns may come into contact with each other to cause a short circuit. However, by giving a curvature over almost the entire circumference, the curvature is increased. Can be increased, and the pitch interval on the inner peripheral side of the single coil-shaped portion is increased, so that the above-described inconvenience can be prevented.

In the present invention, it is desirable to configure the double coil-shaped portion so as to have a curvature over the entire circumference. However, there is a linear portion partially connected to a large curvature portion. Is no problem.

According to a third aspect of the present invention, the coil filament has an MG of 100 to 200, an outer diameter of the first coil portion of 0.5 to 1.5 mm, and a% pitch of an inner peripheral side. 120 to 200%, the outer diameter in the major axis direction of the second coil-shaped portion is 1.7 to 6.0 mm, and the outer diameter in the minor axis direction is 1.6 to 200%.
4.8 mm, the% pitch is in the range of 140 to 300%.

In the filament of the present invention, if the% pitch on the inner peripheral side of the 1st (single) coil-shaped portion located in the double coil-shaped portion is less than 120%, there is a risk of short-circuiting between coil turns. If the% pitch exceeds 200%, there is a possibility that the coil-shaped portion may hang down. A particularly preferred range of the% pitch of the first (single) coiled portion is 135 to 185%.
It was about.

When the outer diameter of the 2nd (double) coil-shaped portion in the major axis direction is less than 1.7 mm, the area facing the reflecting mirror surface is small, the light emission characteristics are reduced, and the 1st (single) coil-shaped portion is short-circuited. If the outer diameter exceeds 6 mm, there is a risk of contact with the inner wall of the bulb and a decrease in luminous efficiency or a breakage of the bulb.

If the outer diameter of the 2nd (double) coil-shaped portion in the minor axis direction is less than 1.6 mm, there is a risk of short-circuiting and shape failure of the 1st (single) coil-shaped portion. If it exceeds 4.8 mm, there is a possibility that the emission characteristics may be degraded due to a decrease in the dimension on the long diameter side. And this 2
The outer diameter in the direction of the major axis and the minor axis of the nd (double) coil-shaped portion can be appropriately determined by balancing in both directions.

Further, if the% pitch of the 2nd (double) coil-shaped portion is less than 140%, there is a short circuit between coil turns due to impact or vibration, and the% pitch is 3%.
If it exceeds 00%, the luminous efficiency may decrease,
A particularly preferred range of the% pitch of the 2nd (double) coiled portion was about 150 to 280%.

According to a fourth aspect of the present invention, in the light bulb, the double coiled filament having an elliptical shape has a major axis of the coil coaxial with the bulb axis and extends in a direction perpendicular to the bulb axis. It is characterized by doing.

An elliptic coiled filament,
Horizontal (left / right) from vertical (vertical) direction perpendicular to the coil axis
Light is radiated widely in the directions, and the same effect as described in the first to third aspects is achieved.

[0025] The light bulb according to claim 5 of the present invention is characterized in that the leg portions at both ends of the filament form a single coil, and the core member is inserted into the coil.

This light bulb has high vibration resistance and shock resistance because it is reinforced by inserting a supporting core member into the leg portion even if it receives vibration or impact. In addition, this light bulb increases the current capacity and heat capacity of the leg part, reduces the resistance of the leg part, lowers the temperature of the leg part and the sealing part, and progresses through thermal distortion occurring in the sealing part and external conductors. The quality of the electric bulb can be improved by performing electrical and mechanical actions such as preventing the sealing member from being oxidized and preventing the sealing portion from being broken or leaked.

A bulb according to a sixth aspect of the present invention is characterized in that a halogen and an inert gas are sealed in the bulb.

The present invention is applied to a halogen bulb which is lit at a high temperature which causes a halogen cycle in the bulb, and has the same effect as the above-mentioned claims.

According to a seventh aspect of the present invention, there is provided a marker lamp having a light emitting window, and a horizontally long lamp provided with the light bulb according to any one of the first to sixth aspects housed in the lamp. And a light control member provided in the light projecting window.

The light bulb having the functions described in the first to sixth aspects has a high luminous characteristic, is resistant to vibration and impact, does not cause a decrease in light distribution or premature disconnection of the filament, and can be used as a marker lamp with a low frequency of bulb replacement. Can be

[0031]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a halogen bulb L used for an aeronautical sign lamp or the like, and FIG. 2 is an enlarged cross-sectional view schematically showing a cross section of an intermediate portion of the filament in FIG.

In the drawing, 1 is a cylindrical valve made of quartz glass, 2 is a crushed sealing portion formed at one end of the valve 1,
Reference numerals 3 and 3 denote sealing members sealed in the crushed sealing portion 2 and are metal foils made of molybdenum Mo foil or the like, and 4 is a double-coil filament disposed inside the bulb 1.

The filament 4 has a double coil-shaped portion 4W serving as a light-emitting source in the middle of which a single coil-shaped portion 4S in which a tungsten tungsten wire is further wound is further wound. The double coil-shaped portion 4W is wound in a substantially circular shape, and is wound in an elliptical shape having a curvature over substantially the entire circumference. The filament 4 has an extending direction (filament axis) perpendicular to the axis of the bulb, and the longer diameter side of the ellipse is parallel to the axis of the bulb, and the shorter diameter side is above and below the axis of the bulb.

Further, the single coil leg portions 4L, 4B which are bent and extended in the right angle direction from both ends of the double coil portion 4W.
L are provided, and the single coil-shaped leg portions 4L, 4L are provided.
In L, core members 5 and 5 made of high-melting-point metal strands such as tungsten W and molybdenum Mo are inserted. Then, the leg portion 4 into which the core members 5 and 5 are inserted.
L and 4L function as internal conductors, and the ends thereof are connected by welding or the like to metal foils 3 and 3 hermetically sealed in a crush sealing portion 2 at the end of the valve 1.

In addition, a halogen (CH
₂ Br ₂ ... 400ppm) inert gas containing (Ar 90
About 5 × 10 ⁵ Pa (pascal) is enclosed in the volume% and the balance N).

External conductors 6, 6 are connected to the other ends of the metal foils 3, 3, respectively. In the drawing, reference numeral 11 denotes an exhaust pipe provided at the other end of the valve 1, and reference numeral 7 denotes a BA15d type having a flange (position adjustment ring) 71 joined to the crushed sealing portion 2 of the valve 1 via a heat-resistant adhesive. These constitute the halogen bulb L.

The halogen lamp L has a rating of, for example, 6.6.
A100W, cylindrical valve 1 has an outer diameter of about 1
2 mm, the total length including the sealing part 2 is about 55 mm, and the optical center dimension (the distance from the flange (position adjustment ring) 71 to the top of the double coil-shaped part 4W of the filament 4) is about 25 mm.

The contents of the reference numerals indicating the respective portions of the double coiled filament 4 are as follows.

Mg; weight mg per 200 mm of tungsten wire; WD: diameter of tungsten wire mm; OAL: total length of tungsten wire mm; P1:% pitch of 1st coil; MD1: inner diameter of 1st coil mm; D1: 1st coil CL1, the total length of the first coil mm, P2, the% pitch of the second coil, D2L, the major diameter of the second coil mm, D2S, the minor diameter of the second coil mm, CL2, the total length of the second coil mm .

The configuration (coil data) of the filament 4 having a rating of 6.6 A and 100 W is such that Mg is about 150
(Wire diameter WD is about 0.22mm), OAL is about 180mm
Of tungsten wire, inner diameter MD1 is about 0.3mm,%
The pitch P1 is about 120%, the% mandrel MD1 / WD is about 140%, and the total length CL1 is about 50 mm.
t) The coil 4S portion is wound, and the single coil 4S
The middle part of the above has a major diameter D2L × a minor diameter D2S of about 1.
An elliptical double coil-shaped portion 4W of 3 mm x approximately 0.3 mm and a% pitch P2 of approximately 150% is wound around a total length CL2 of approximately 5 mm, and further from both ends of the double coil-shaped portion 4W. A single (1st) coil-shaped leg portion 4L, 4 having a length of about 13 mm and a length of about 75 to 90 degrees and extending in the major axis direction.
L is formed as a double coiled filament 4.

In each of the leg portions 4L, 4L composed of a single coil 4S at both ends of the filament 4,
A core member 5 made of a tungsten element wire having a wire diameter of about 0.3 mm (Mg about 270) and a length of about 13 mm is inserted.

When the base 7 of the bulb L having the above configuration is mounted on a socket (not shown) and energized, a current flows through the external conductor, the metal foils 3, 3, and the legs 4L, 4L, and the filament 4 The heavy coil 4W emits light and lights up.

Since the bulb L has the double coiled filament 4 disposed in the bulb 1, the luminous efficiency can be remarkably improved as compared with this kind of conventional bulb using a single coil filament. Since the portion of the double coil-shaped portion 4W that forms the light-emitting portion of the filament 4 is wound in an elliptical shape, it can be horizontally (left and right) with a certain width viewed from the extending axis direction of the double coil-shaped portion 4W. Light irradiation in the direction can be strong, and light irradiation in the up-down (vertical) direction can be weak.
That is, the equal illuminance curve in the left-right direction in the extending direction (filament axis) of the filament 4 of the light bulb L exhibits a characteristic in which a desired number of approximately 8 is rotated by 90 degrees.

What is important is that the portion of the double coil-shaped portion 4W is wound into an elliptical shape having a curvature over substantially the entire circumference as viewed from the transverse direction, so that the curvature is larger than in the case of the flat shape having the straight portion. The interval between the winding pitches P1 of the single coil-shaped portions 4S does not locally become narrow, and the intervals can be made substantially the same regardless of which part is viewed.

That is, when the double coil-shaped portion is composed of a straight portion and a curved (curvature) portion as in the case of a flat shape, the inner circumference of the single coil-shaped portion from the curved (curvature) portion to the straight portion is formed. There is a tendency for the pitch interval on the side to be narrowed (narrowed). In this portion, pitch unevenness occurs, and the interval between the adjacent single coils may be reduced or they may come into contact with each other when the interval is excessive. When the turns of the coil are close to each other or short-circuited, the temperature may be locally high, or the wire may be disconnected early and have a short life. With the (curvature) portion, it is possible to provide a long-life bulb L that does not have such pitch unevenness.

In addition, even if the bulb L receives vibrations or shocks regardless of whether it is on or off, the core members 5 and 5 are inserted into the legs 4L and 4L, respectively, so that they are integrated and reinforced. Has vibration and impact resistance. The leg portion 4L of the light bulb L1 has an increased current capacity and heat capacity due to the core members 5 and 5, can reduce the resistance of the leg portion 4L, and can lower the temperatures of the leg portion 4L and the sealing portion 2. 2 to reduce the thermal distortion and the oxidation of the metal foil 3 that progresses through the external conductor, thereby preventing destruction and leakage of the sealing portion 2, etc. The quality of L can be improved.

FIG. 3 is a longitudinal sectional view showing an embodiment of the marker light D of the present invention. In FIG. 3, reference numeral 81 denotes a base, 8
Reference numeral 2 denotes a lid which is superimposed on the base 81 and constitutes the lamp body 8. A projection window 83 is provided with a prism lens 84 fitted therein as a light control body.

Further, a terminal block 85 for adjusting the optical axis and making an electrical connection is provided in the lamp body 8, and a reflecting mirror 86 containing the halogen bulb L is disposed on the terminal block 85.
The optical axis A is directed to the light emitting window 83.

FIGS. 4 and 5 are a front view and a side view, respectively, of a reflector 86 containing the halogen bulb L.
Has a substantially horizontal shape in which upper and lower portions of a bowl-shaped paraboloid of revolution formed of a metal plate or a heat-resistant synthetic resin are cut off and the cut portion is covered with a flat plate. In FIGS. 4 and 5,
An insertion hole (not shown) for a light bulb is formed on the lower surface side, and a socket 87 is provided facing the insertion hole. In the figure, reference numeral 89 denotes a power supply line.

When the base 7 of the halogen lamp L is mounted on the socket 87 through the insertion hole of the reflecting mirror 86, the dimensions of the lamp L can be adjusted in advance between the position of the filament 4 and the flange (position adjustment ring) 71. Therefore, the double coil-shaped portion 4W of the filament 4 of the bulb L can be positioned at the focal position of the reflecting mirror 86. The direction of light irradiation of the reflecting mirror 86 can be adjusted on the terminal block 85.

The marker light D is buried in the runway of the airport or on the road 9, projects the cover 82 from the road surface, and emits light in a predetermined direction from the light projecting window 83, for example, slightly downward from the optical axis A. It is used as a guide light and a center light of a road.

The marker lamp D is supplied with power from a power supply device (not shown) to the terminal block 85 via an electric wire, and the bulb L attached to the socket 87 is turned on. Since the bulb L attached to the marker lamp D uses the double coiled filament 4 as described above, the luminous efficiency can be remarkably improved as compared with the conventional bulb using a single coil filament, and Since the portion of the double coil-shaped portion 4W constituting the light emitting portion of No. 4 is wound in an elliptical shape matched to the reflecting mirror 86, it is horizontal (left and right) with a certain width viewed from the irradiation direction.
The irradiation of light in the direction can be increased, and the irradiation of light in the vertical (up-down) direction can be reduced.

Further, since the bulb L has a long life without causing a pitch unevenness or the like in the filament 4, it is not necessary to frequently replace the filament 4 in a short period of time.
It has advantages such as easy maintenance.

The present invention is not limited to the above embodiment. For example, the type of light bulb is not limited to a halogen light bulb, but may be an infrared light bulb or the like in which only an inert gas containing no halogen is filled. Further, the sealing portion formed at the bulb end portion of the bulb may be a sealing portion formed by contracting the bulb without being limited to the crushing sealing, and the sealing member is not limited to the metal foil made of molybdenum foil. Or a linear member such as tungsten foil or molybdenum tungsten.

The glass material of the bulb is not limited to quartz glass, but may be any other hard glass material having the required translucency, light refractive index and heat resistance. The shape is not limited to the cylindrical shape, and may be an elliptical shape, a spherical shape, or a combination thereof.

In addition, a core member is inserted into the leg portion of the filament, and tungsten or molybdenum Mo is added into the leg portion.
And the like, or a support coil composed of element wires may be provided, or a sub coil may be wound.

Further, the marker light is not limited to the structure and application shown in the above embodiment, but may have another structure or application. The light control body may be a lens, a color filter, a protective cover, or the like. It does not matter. Also, as shown in FIGS. 6A to 6C, for example, the shape of the reflecting mirror is a horizontally long reflecting mirror 8 in which upper and lower surfaces serving as ineffective reflecting surfaces are not formed.
8 is acceptable. Furthermore, although the marker lamp is mounted with one bulb and emits light in only one direction, the marker lamp may emit light in multiple directions by changing the reflecting mirror.
Further, the marker lamp may emit light in two directions, in which the light bulb with the reflecting mirror is provided in the above-described embodiment in the opposite direction (of course, a light projecting window and a light control body are also required).

[0058]

According to the first and fourth aspects of the present invention, it is possible to provide a high-quality bulb having improved light emission characteristics and life characteristics.

According to the second aspect of the present invention, in addition to the effects similar to those of the first and fourth aspects described above, it is possible to provide a long-life bulb in which pitch irregularities do not occur in a coiled filament. it can.

According to the third aspect of the present invention, the same effects as those described in the first, second, and fourth aspects are obtained by regulating the dimensions of the coiled filament.

According to the fifth aspect of the present invention, the leg portions are reinforced to have high vibration resistance and impact resistance. In addition, since the support wire is parallel to the base end of the small-diameter leg, the current capacity and heat capacity increase, and the resistance of the leg can be reduced, and the temperature of the leg and the sealing portion can be reduced. Electrically and mechanically acting, such as reducing thermal distortion occurring in the sealing portion and oxidization of the sealing member traveling through the external conductor to prevent breakage and leakage of the sealing portion. The quality of the bulb can be improved.

According to the sixth aspect of the present invention, the same effect as described in the first to fifth aspects is obtained by applying the present invention to a halogen lamp. Since the light bulb according to any one of the above items 6 is provided, it is possible to provide a marker light that has no short life of the light bulb and has a low bulb replacement frequency and is easy to maintain.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a halogen bulb used for an aeronautical sign lamp or the like according to the present invention.

FIG. 2 is an enlarged sectional view schematically showing a cross section of an intermediate portion of the filament in FIG.

FIG. 3 is a longitudinal sectional view showing an embodiment of the marker lamp of the present invention.

FIG. 4 is a front view showing an embodiment of a reflecting mirror accommodating a halogen bulb according to the present invention.

FIG. 5 is a side view of the reflecting mirror shown in FIG.

6 (a) is a front view, FIG. 6 (b) is a side view of FIG. 6 (a), and FIG. 6 (c) is a view of FIG. 6 (a). FIG.

FIG. 7 shows a conventional coiled filament, and FIG.
Is a front view, and FIG. 2B is a side view of FIG.

[Explanation of symbols]

 L: halogen bulb 1: glass bulb 2: sealed portion 4: coiled filament 4W: double coiled portion 4S: single coiled portion 4L: leg portion 5: core member D: marker lamp 8: lamp 83: throw Light window 84: Light control body 86: Reflector

Claims (7)

[Claims] 1. A glass bulb having a seal at an end;
A sealing member hermetically sealed in the sealing portion; a double coil-shaped filament disposed in the valve, connected to an end leg portion of the sealing member, and wound in an intermediate portion in an oval shape; An inert gas sealed in a bulb. 2. The electric bulb according to claim 1, wherein the double coil-shaped portion in the middle portion of the filament has an oval shape having a curvature all around. 3. The coiled filament has an MG of 10
0 to 200, the outer diameter of the first coil-shaped part is 0.5 to 1.5
mm, the% pitch on the inner circumference side is 120 to 200%, the outer diameter in the major axis direction of the second coil-shaped portion is 1.7 to 6.0 mm, and the outer diameter in the minor axis direction is 1.6 to 4.8 mm,% pitch Is 140 ~
3. Light bulb according to claim 1 or 2, characterized in that it is in the range of 300%. 4. The double coiled filament having an elliptical shape, the major axis of the coil being coaxial with the valve axis and extending in a direction perpendicular to the valve axis. 4. The light bulb according to any one of 1 to 3. 5. The electric bulb according to claim 1, wherein the leg portions at both ends of the filament have a single coil shape, and a core member is inserted in the coil. 6. The valve according to claim 1, wherein a halogen and an inert gas are sealed in the bulb.
A light bulb according to any one of the preceding claims. 7. A lamp having a light projecting window; a horizontally long reflecting mirror accommodated in the lamp and having the light bulb according to any one of claims 1 to 6 provided therein; And a light control member.