JP2013109899A - Illumination lamp, rolling stock and method of use of illumination lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an illumination lamp such as an LED lamp from rotating.SOLUTION: The illumination lamp 50 is a straight-tube LED lamp system, of which a straight-tube LED lamp includes a light-emitting part 54. The light-emitting part 54 has LEDs 23, a substrate 24 and a heat sink 25. A control device needed for stably operating the LEDs 23 is not integrated. Further, in view of long-period use, the lamp prevents dust hindering safety during use from infiltrating inside. A relation between an outer diameter A of a glass tube 21 of the lamp 50 and a gravity position B of gravity G of a lamp cross section satisfies: B/A≤1/3. Since the gravity G is biased, the lamp 50 is unlikely to roll to restrain itself from damaging something due to inadvertent rolling.

Description

  The present invention relates to an illumination lamp such as an LED lamp. In particular, the present invention relates to a straight tube illumination lamp that is provided with measures for preventing rolling.

A conventional straight tube fluorescent lamp has a phosphor layer formed on the inner surface of a glass tube, electrodes are provided at both ends of the glass tube, low-pressure mercury vapor discharge is caused between the two electrodes, and ultraviolet rays generated therefrom are visible in the phosphor layer. In general, a pair of bases are fixed to both ends of the main tube glass bulb.
It is well known that conventional fluorescent lamps are widespread and commonly used, and that the material is glass, while glass breaks into pieces that cause cuts. Therefore, it has been recognized that fluorescent lamps are easily broken, and the handling thereof has been carried out with care.

  On the other hand, an illumination light source using an LED having a shape similar to that of a straight tube fluorescent lamp as a light source has already been commercialized. For example, a straight tube LED lamp system having an L-shaped (GX16) base established as a JEL801 standard by the Japan Light Bulb Industry Association, or a straight tube LED lamp using the same G13 base as a conventional fluorescent lamp There is a system.

  The straight tube LED lamp generally has an outer shell composed of a heat radiating portion mainly made of an aluminum material called a heat sink and a resin diffusion cover for the purpose of releasing heat of the LED element. Straight tube LED lamps have recently become widespread. However, unlike fluorescent lamps, there are many cases in which the outer shell is composed of aluminum and resin parts, and it is difficult to pay attention to handling.

  The inventors designed a straight tube LED lamp made of glass whose outer shell is made of incombustible material. This is an attempt to construct an outer shell of non-combustible material for the purpose of evacuation, in order to complete the use of lighting among other lighting fixture components for evacuation. When various tests are performed on prototypes, the straight tube LED lamp is generally not made of glass, so care is taken when handling it. When the lamp is placed on the floor for replacement, many lamps roll and Something that collided with the metal part of the floor or was damaged. With conventional straight tube fluorescent lamps, everyone knows that it is made of glass and is easy to break, and the center of gravity is near the center of the lamp cross section. Since the lamp was replaced with sufficient knowledge that a high-speed collision occurred and the lamp was damaged, such a problem was avoided.

  Therefore, even if a straight tube LED lamp with a glass outer shell is inadvertently handled as an LED lamp instead of a fluorescent lamp, or a rough replacement operation is performed, there is a risk that the straight tube LED lamp will rotate and break. There is a need to reduce it.

  2. Description of the Related Art Conventionally, there is a discharge lamp characterized in that the cross section of a glass tube and the cross section of a base are elliptical in order to prevent rolling of a straight tube illumination lamp (Patent Document 1).

  In addition, there is an illumination lamp formed on the outer periphery of the base in eight corners in order to prevent the main body from rolling (Patent Document 2).

  If the outer shape of the illumination lamp is deformed as in the prior art, it may become incompatible with the shape of the conventional illumination lamp and may not be attached to the lighting device. It is desirable to prevent rolling without deforming the outer shape of the illumination lamp.

JP-A-5-251045 JP 2010-123097 A

  An object of the present invention is to reduce the risk of destruction due to rotation of an illumination lamp.

The illumination lamp according to the present invention is:
A cylindrical glass tube with an outer diameter A;
A light emitting part housed in a glass tube,
The center of gravity position B in the cross section of the glass tube is at a position equal to or less than 1/3 of the outer diameter A from the outer surface of the glass tube.

The light emitting part
A light emitting diode;
A substrate with a light emitting diode attached thereto;
A heat sink bonded to the inner surface of the glass tube having a substrate mounting surface to which the substrate is mounted;
The substrate mounting surface of the heat sink is arranged at a position that is 1/6 or more and less than 1/2 of the inner diameter Y from the inner surface of the glass tube.

Further, the heat sink is a D-shaped aluminum heat sink in which the outer shape in the cross section of the glass tube has an arcuate portion along the inner surface of the glass tube and a linear portion serving as a substrate mounting surface.
The substrate mounting surface is characterized in that it is arranged at a position of ¼ or more and less than ½ of the inner diameter Y from the inner surface of the glass tube.

The heat sink is a plate-shaped aluminum heat sink having a predetermined width H and a predetermined thickness T in the cross section of the glass tube.
The heat sink has the surface on the center side of the glass tube as the substrate mounting surface.
The ratio of the width H and the inner diameter Y of the heat sink is 5:24 or more and 20:24 or less, and
The ratio of the thickness C of the heat sink to the inner diameter Y is 4:24 or more and 12:24 or less,
The substrate mounting surface is characterized in that it is disposed at a position of 1/6 or more and less than 1/2 of the inner diameter Y of the glass tube from the inner surface of the glass tube.

  Further, the ratio between the weight V of the heat sink and the weight W of the glass tube is 1: 3 or more and 1: 1 or less.

  The center of gravity G exists on the board mounting surface.

  In addition, a scattering prevention film is provided on the outer surface of the glass tube.

The railway vehicle according to this invention is
The illumination lamp is attached.

The method of using the illumination lamp according to the present invention is as follows:
The illumination lamp is used for a building, facility, or place where external light is not incident or external light is not expected during disaster evacuation, such as an underground station building, underground road, underground mall, tunnel, basement, dome, indoor, etc. .

  Since the illumination lamp according to the present invention prevents rolling by changing the position of the center of gravity, it is possible to prevent rolling without deforming the outer shape of the illumination lamp.

The figure which shows the illumination lamp 50 of Embodiment 1-4. FIG. 3 is a diagram illustrating a cross section of the illumination lamp 50 according to the first embodiment. The figure which shows the cross section of the illumination lamp 50 of Embodiment 2. FIG. FIG. 5 is a diagram showing a cross section of an illumination lamp 50 according to a third embodiment. The figure which shows the cross section of the illumination lamp 50 of Embodiment 4. FIG.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an illumination lamp 50 according to the first embodiment.
The illumination lamp 50 has a glass tube 21. The glass tube 21 is a straight tube type glass tube. A pair of caps 52 are provided at both ends of the glass tube 21. Each base 52 includes a pair of pins 53. The number and shape of 53 are not limited to the figure, and may be other numbers or shapes.

  The glass tube 21 houses a light emitting unit 54. The light emitting unit 54 includes the LED 23, the substrate 24, and the heat sink 25. The LED 23 is composed of a single LED (light emitting diode) or an LED module.

  The illumination lamp 50 has a structure in which a control device necessary for stable operation is not integrated. That is, the illumination lamp 50 is lit by being supplied with a constant DC current that turns on the LED 23 from an external power source.

  The supply of electric power may be received from the pin 53 or from a connector not shown.

  The illumination lamp 50 has a structure that prevents dust from entering the lamp that impairs safety during use from the viewpoint of long-term use. That is, the glass tube 21 and the base 52 are bonded, and the light emitting portion 54 is sealed.

  The illumination lamp 50 is a straight tube illumination lamp having a glass outline and a conventional outer shape. The illumination lamp 50 is a straight tube LED lamp system that cannot be permanently disassembled without impairing its function.

The illumination lamp 50 has a glass outer shell and does not deform the outer shape of the straight tube illumination lamp.
As will be described below, the illumination lamp 50 reduces the risk of breakage due to rotation of a straight tube illumination lamp having a conventional outer shape.

2 is a ZZ sectional view (transverse sectional view) of the illumination lamp 50 shown in FIG.
The meanings of the symbols in the figure are as follows.
O: Center of glass tube 21 G: Center of gravity of cross section of illumination lamp 50 A: Outer diameter of glass tube 21 (for example, 25.5 mm)
Y: inner diameter of the glass tube 21 (for example, 24 mm)
B: Position of the center of gravity G C: Thickness of the heat sink 25 (maximum thickness in the radial direction)

A diffusion film 22 is formed on the inner surface of the glass tube 21.
In this embodiment, the height of the substrate mounting surface 27 from the inner surface of the glass tube 21 is the same as the thickness C of the heat sink 25.

  The thickness C of the heat sink 25 (the height of the board mounting surface 27) is less than half of the inner diameter Y, and the LED 23 of the light emitting portion 54 is disposed at the position of the center O of the glass tube 21 or below the center O. Yes. The reason is to make the light emission angle of the LED 23 wide.

  A plurality of LEDs 23 are bonded to the substrate 24. The substrate 24 is a long flat plate extending to both ends (up to both caps) in the length direction of the glass tube 21. A circuit for supplying power to the LEDs 23 is printed or wired on the substrate 24. A plurality of LEDs 23 are physically and electrically joined to the upper surface of the substrate 24 at equal intervals. The lower surface of the substrate 24 is bonded to the substrate mounting surface 27 of the heat sink 25 with an adhesive or double-sided tape having high thermal conductivity.

  The heat sink 25 has a D-shaped cross section and is hollow inside. The heat sink 25 is a long aluminum heat sink that extends to both ends (up to both caps) in the length direction of the glass tube 21. The hollow portion penetrates in the length direction. The heat sink 25 has an arcuate portion along the inner surface of the glass tube 21 and a straight portion that becomes the substrate mounting surface 27. The lower part of the arc portion of the heat sink 25 and the glass tube 21 are bonded by an adhesive 26. Silicone or adhesive silicone is used as the adhesive.

  The arc portion of the heat sink 25 is a circle having the same diameter as the inner diameter Y of the glass tube 21, and its center is preferably an arc of the same circle as the center O of the glass tube 21. The reason is that the area where the inner surface of the glass tube 21 and the arc portion are opposed to each other with a slight gap increases, and the heat dissipation is improved.

  The adhesive 26 may be in the entire gap between the arc portion and the glass tube 21, but the adhesive 26 may be only a part as long as the light emitting portion 54 can maintain a strength that does not peel off from the inner surface of the glass tube 21. . For example, the adhesive 26 may be only at the lower center of the heat sink 25 as shown. Alternatively, only two left and right may be used. Alternatively, only the lower center and the left and right three locations may be used. When only a part of the adhesive 26 is used, there is an advantage that the entire weight is reduced. The same applies when a double-sided tape is used instead of the adhesive.

  Since the heat sink 25 is a metal and the glass tube 21 is glass, if the heat sink 25 and the glass tube 21 are in direct contact, the glass tube 21 may be damaged when subjected to an impact. Therefore, it is better that the heat sink 25 and the glass tube 21 are not in direct contact. Therefore, it is desirable that the adhesive 26 exists between the heat sink 25 and the glass tube 21. Since the adhesive 26 exists between the heat sink 25 and the glass tube 21, the heat sink 25 and the glass tube 21 do not come into direct contact with each other. The adhesive 26 has functions of adhesion and cushion. The same applies to the case of double-sided tape.

  The diffusion film 22 is not present in the portion where the adhesive 26 is present. The reason is that the adhesive 26 and the glass tube 21 are brought into direct contact with each other and the adhesive strength between the adhesive 26 and the glass tube 21 is improved.

  For example, the specific length, weight, specific gravity, and thermal conductivity of each part shown in FIGS. 1 and 2 are as follows. For reference, iron and copper are also shown.

1. Length Outer diameter A of glass tube 21: 25.5 mm
Inner diameter Y of glass tube 21: 24 mm
Width K of substrate 24: 18 mm (75% of inner diameter Y)
Heat sink 25 width H: 20 mm (83.3% of inner diameter Y)

2. Weight Weight of lighting lamp 50 J: 360 g (however, maximum 500 g)
Weight W of glass tube 21: 180 g (50% of illumination lamp 50)
Weight U of the light emitting unit 54: 180 g (50% of the illumination lamp 50)
Weight V of heat sink 25: 145 g (40% of lighting lamp 50)
Other weight: 35g (10% of lighting lamp 50)
(Other weights include the weight of the LED 23, the substrate 24, the base 52, and the pin 53.)

3. Specific gravity Glass tube 21: about 2.5
Heat sink 25 (aluminum): 2.7
Adhesive 26 (silicone): 2.2 to 3.05
Iron: 7.8
Copper: 8.9

4). Thermal conductivity (W / m · K)
Glass tube 21: 1
Heat sink 25 (aluminum): 236
Adhesive 26 (silicone): 0.83-4.0
Iron: 84
Copper: 413

In the straight tube LED lamp according to the present embodiment, the center of gravity G of the lamp cross section is unevenly distributed on one side from the center O of the illumination lamp, and the center of gravity B of the center of gravity G is equal to the outer diameter A of the glass tube 21. In relation
B / A ≦ 1/3
It is what.
That is, the center of gravity G exists at a position that is shifted from the center O by 1/6 or more.

  In the case of an illumination lamp that does not have the light emitting unit 54, the center of gravity G coincides (is substantially coincident) with the center O. However, mounting the light emitting unit 54 moves the center of gravity G of the illumination lamp 50 to a position shifted from the center O by 1/6 or more.

  The amount of movement of the center of gravity depends on the weight (particularly the heat sink 25) and the position of the light emitting unit 54 (particularly the heat sink 25). In particular, it also depends on the ratio between the weight V of the heat sink 25 and the weight W of the glass tube 21. In the present embodiment, the ratio between the weight V (145 g) of the heat sink 25 and the weight W (180 g) of the glass tube 21 is 4: 5 (≈145: 180).

  Since the thickness C of the heat sink 25 is desirably less than half of the inner diameter Y, the position of the substrate mounting surface 27 of the heat sink 25 is arranged at a position less than ½ of the inner diameter Y from the inner surface of the glass tube 21. . Alternatively, the LED 23 is disposed at a position less than ½ of the inner diameter Y from the inner surface of the glass tube 21.

  The straight tube LED lamp according to the present embodiment is characterized in that the gravity center position B in the cross section of the glass tube 21 is at a position equal to or less than 1/3 of the outer diameter A from the outer surface of the glass tube 21.

  According to this configuration, the center of gravity G is deviated from the center O by 1/6 or more, so that the illumination lamp 50 is difficult to roll and can be prevented from colliding and being damaged due to unexpected rolling.

  Furthermore, if a fluorescent lamp anti-scattering film is coated on the outside, the glass will hardly be scattered even if it is broken. A heat shrinkable tube is used as an anti-scattering film. For example, it is possible to manufacture the illumination lamp 50 by inserting the straight tube-shaped illumination lamp into a heat-shrinkable tube made of PET having a thickness of 110 μm and heat-shrinking the heat-shrinkable tube.

As described above, the illumination lamp 50 of the first embodiment is a straight tube LED lamp system.
The straight tube LED lamp has a pair of bases 52 and LEDs 23 (LED unit or LED module) at both ends, and has a structure in which a control device necessary for the LED 23 to operate stably is not integrated. In addition, from the viewpoint of long-term use, the structure does not allow dust to enter the lamp, which impairs safety during use. Furthermore, the structure is damaged when it is decomposed.
The illumination lamp 50 according to the first embodiment is characterized in that the gravity center position B of the lamp cross section satisfies B / A ≦ 1/3.

The illumination lamp 50 according to the first embodiment has an effect that the risk of breakage is effectively suppressed even by careless handling that is difficult to roll.
If the anti-scattering film is formed to shrink on the outer surface, there is an effect of preventing the glass from scattering.

Since the illumination lamp 50 of this embodiment is made of nonflammable glass, it is resistant to fire, and even if a fire occurs in a railway vehicle, it is difficult to burn and can be lit for a long time.
When assuming a vehicle fire or the like in a tunnel or an underground route, among the other lighting fixture components for evacuating passengers, the lighting lamp 50 of the present embodiment is a non-combustible material in order to complete the use of lighting to the end. The outer shell is made up of.
The illumination lamp 50 according to the present embodiment is used for a building, facility, or place where external light is not incident or no external light can be expected during a disaster evacuation, such as an underground station building, underground road, underground mall, tunnel, basement, dome, indoor, etc. It is good.

  Also, in rail cars, floors, walls, and chairs are made of metal, so when the lamps are placed on the floor inside the vehicle for replacement, many lamps roll and collide with each other or with metal parts inside the vehicle and break. Although it is easy to generate | occur | produce, even if the illumination lamp 50 of this Embodiment uses glass, the risk of destruction by rotation is reduced.

Embodiment 2. FIG.
FIG. 3 is a ZZ sectional view (transverse sectional view) of the illumination lamp 50 shown in FIG.
Hereinafter, differences from the first embodiment will be mainly described.
The heat sink 25 has a D-shaped cross section, and is a lump of aluminum with no hollow portion inside.
In this example, the case where the adhesive 26 is present on the entire arc portion is shown, but it may be a portion.

  In the straight tube LED lamp according to the present embodiment, the thickness C of the heat sink 25 is ¼ of the inner diameter Y of the glass tube 21, and the substrate mounting surface 27 of the heat sink 25 has an inner diameter from the inner surface of the glass tube 21. It is arranged at a position 1/4 of Y. If it is less than 1/4, there is no place where the light emitting unit 54 is disposed, and the weight of the light emitting unit 54 is reduced. For this reason, B / A ≦ 1/3 cannot be achieved.

  The heat sink 25 has a D-shaped cross section, and the arc portion of the heat sink 25 is a circle having the same diameter as the inner diameter Y of the glass tube 21, and the center of the arc is the same circle as the center O of the glass tube 21. In this case, B / A = 1/3 can be achieved with the heat sink 25 having the minimum weight.

  In the case of the specific length, weight, specific gravity, and thermal conductivity of each part described in the first embodiment, the weight V of the heat sink of the second embodiment is 60 g. The minimum value of the ratio between the heat sink weight V (60 g) and the glass tube weight W (180 g) is 1: 3 (= 60: 180). On the other hand, the maximum value is preferably 1: 1 or 4: 5 described in the first embodiment in order not to increase the overall weight significantly. Therefore, the maximum value of the ratio between the weight V of the heat sink and the weight W of the glass tube is 1: 3 or more and 1: 1 or less, or 1: 3 or more and 4: 5 or less.

  When the thickness C of the heat sink 25 becomes more than half of the inner diameter Y, the LED 23 is disposed beyond the center O, so the thickness C of the heat sink 25 is less than half of the inner diameter Y. That is, the board mounting surface 27 of the heat sink 25 or the LED 23 is disposed at a position less than ½ of the inner diameter Y from the inner surface of the glass tube 21.

  If the thickness C of the heat sink 25 is set to 1/4 or more, the position of the center of gravity G decreases from 1/3 and approaches the inner surface of the glass tube 21. When the thickness C of the heat sink 25 increases beyond the center of gravity G, the center of gravity G approaches the center O. Therefore, when the thickness C of the heat sink 25 coincides with the center of gravity G (C = B), the center of gravity G is It approaches the inner surface of the glass tube 21 most. That is, when the center of gravity G exists on the substrate mounting surface 27, the center of gravity G is closest to the inner surface of the glass tube 21. In this case, the positions of the board mounting surface 27 and the center of gravity G are in the same position in any range of more than 1/4 and less than 1/3.

  In the illumination lamp 50 according to the present embodiment, the gravity center position B of the lamp cross section is set to B / A ≦ 1/3, and the substrate mounting surface 27 of the heat sink 25 is ¼ or more of the inner diameter Y from the inner surface of the glass tube. It is arranged at a position less than 1/2.

  According to this structure, since the gravity center is biased, it is difficult for the illumination lamp 50 to roll, and it is possible to suppress the collision and breakage due to unexpected rolling.

Embodiment 3 FIG.
FIG. 4 is a ZZ cross-sectional view (transverse cross-sectional view) of the illumination lamp 50 shown in FIG.
Hereinafter, differences from the first embodiment will be mainly described.
The meanings of the symbols in the figure are as follows.
Y: Inner diameter (for example, 24 mm)
H: Width of heat sink (for example, 5 mm)
C: Heat sink thickness (for example, 4 mm)
T: Height of the board mounting surface 27 or position of the board mounting surface 27 (maximum height in the radial direction)
The heat sink 25 is a long aluminum plate having a rectangular cross section and no hollow portion inside. The heat sink 25 has a surface (upper surface) on the center side of the glass tube 21 as a substrate mounting surface 27.
Lower portions of both side surfaces of the heat sink 25 are bonded to the inner surface of the glass tube 21 with an adhesive.

  In the straight tube LED lamp according to the present embodiment, the substrate mounting surface 27 of the heat sink 25 is arranged at a position 1/6 of the inner diameter Y from the inner surface of the glass tube 21. If it is less than 1/6, the width H of the heat sink is reduced, and the weight of the light emitting portion 54 is reduced. For this reason, B / A ≦ 1/3 cannot be achieved.

The ratio of the heat sink width H to inner diameter Y is 5:24, and
If the ratio of the heat sink thickness C to the inner diameter Y is 4:24,
With a minimum weight heat sink 25, B / A = 1/3 can be achieved.

  In the case of the specific length, weight, specific gravity, and thermal conductivity of each part described in the first embodiment, the weight V of the heat sink of the third embodiment is 60 g. The minimum value of the ratio between the heat sink weight V (60 g) and the glass tube weight W (180 g) is 1: 3 (= 60: 180). On the other hand, the maximum value is preferably 1: 1 or 4: 5 described in the first embodiment in order not to increase the overall weight significantly. Therefore, the maximum value of the ratio between the weight V of the heat sink and the weight W of the glass tube is 1: 3 or more and 1: 1 or less, or 1: 3 or more and 4: 5 or less.

  The thickness C of the heat sink 25 is less than half of the inner diameter Y, and the substrate mounting surface 27 (or LED 23) of the heat sink 25 is disposed at a position less than ½ of the inner diameter Y from the inner surface of the glass tube 21. When the substrate mounting surface 27 is disposed at a half of the inner diameter Y from the inner surface of the glass tube 21, the ratio (maximum value) between the width H and the inner diameter Y of the heat sink is 1: 1. In order to achieve B / A ≦ 1/3 with the heat sink 25, it is desirable that the substrate mounting surface 27 is 1/3 or less of the outer diameter A of the glass tube 21. When the substrate mounting surface 27 is arranged at 1/3 of the outer diameter A of the glass tube 21, the heat sink width H of the inner surface of the glass tube 21 is about 22 mm, so the ratio between the heat sink width H and the inner diameter Y is Is 22:24 or less.

  Further, the thickness C of the heat sink 25 is less than half of the inner diameter Y, and the maximum value of the ratio between the height T of the substrate mounting surface 27 and the inner diameter Y is less than 12:24.

  If the height T of the board mounting surface 27 is greater than or equal to half of the inner diameter Y, the LED 23 is disposed beyond the center O, so the height T of the board mounting surface 27 is less than half of the inner diameter Y. That is, the board mounting surface 27 of the heat sink 25 or the LED 23 is disposed at a position less than ½ of the inner diameter Y from the inner surface of the glass tube 21.

  If the thickness H of the heat sink 25 is increased while the width H of the heat sink 25 is left as it is, and the height T of the board mounting surface 27 is set to 1/6 or more, the position of the center of gravity G decreases from 1/3. It approaches the inner surface of the glass tube 21. When the thickness C of the heat sink 25 increases beyond the center of gravity G, the center of gravity G approaches the center O. Therefore, when the height T of the board mounting surface 27 coincides with the center of gravity G (when T = B), The center of gravity G is closest to the inner surface of the glass tube 21. That is, when the center of gravity G exists on the substrate mounting surface 27, the center of gravity G is closest to the inner surface of the glass tube 21. In this case, the positions of the board mounting surface 27 and the center of gravity G are in the same position in any range of more than 1/6 and less than 1/3.

In the illumination lamp 50 according to the present embodiment, the gravity center position B of the lamp cross section is set to B / A ≦ 1/3,
The ratio of the width H and the inner diameter Y of the heat sink is 5:24 or more and 20:24 or less, and
The ratio of the heat sink thickness T to the inner diameter Y is 4:24 or more and 12:24 or less,
The board mounting surface 27 is characterized in that it is disposed at a position that is 1/6 or more and less than 1/2 of the inner diameter Y of the glass tube 21 from the inner surface of the glass tube 21.
According to this structure, since the gravity center is biased, it is difficult for the illumination lamp 50 to roll, and it is possible to suppress the collision and breakage due to unexpected rolling.

Embodiment 4 FIG.
FIG. 5 shows the adhesive 26 having the configuration shown in FIG. 4 filled between the inner surface of the glass tube 21 and the heat sink 25. Compared to FIG. 4, the center of gravity G can be further biased.

Embodiment 5 FIG.
In the first to fourth embodiments, if the heat sink 25 is made of copper or iron having a specific gravity heavier than aluminum, the center of gravity G can be further biased.

  In the first to fourth embodiments, the heat sink 25 may have other shapes. For example, the cross-sectional shape may not be D-shaped or rectangular, but B-shaped, C-shaped, E-shaped, H-shaped, I-shaped, K-shaped, M-shaped, T-shaped, U-shaped Shape, V shape, W shape, X shape, Y shape, U shape, dish shape, concave shape, convex shape, elliptical shape, triangular shape, square shape, polygonal shape. The heat sink 25 may have a hollow portion or a lump.

  21 glass tube, 22 diffusion film, 23 LED, 24 substrate, 25 heat sink, 26 adhesive, 27 substrate mounting surface, 50 illumination lamp, 52 base, 53 pins, 54 light emitting part.

Claims (9)

A cylindrical glass tube with an outer diameter A;
A light emitting part housed in a glass tube,
The center of gravity position B in the cross section of a glass tube exists in the position below 1/3 of the outer diameter A from the outer surface of a glass tube, The illumination lamp characterized by the above-mentioned. The light emitting part
A light emitting diode;
A substrate with a light emitting diode attached thereto;
A heat sink bonded to the inner surface of the glass tube having a substrate mounting surface to which the substrate is mounted;
2. The illumination lamp according to claim 1, wherein the substrate mounting surface of the heat sink is disposed at a position of 1/6 or more and less than 1/2 of the inner diameter Y from the inner surface of the glass tube. The heat sink is a D-shaped aluminum heat sink in which the outer shape in the cross section of the glass tube has a circular portion along the inner surface of the glass tube and a straight portion serving as a substrate mounting surface,
3. The illumination lamp according to claim 2, wherein the substrate mounting surface is disposed at a position that is not less than 1/4 and less than 1/2 of the inner diameter Y from the inner surface of the glass tube. The heat sink is a plate-shaped aluminum heat sink having a predetermined width H and a predetermined thickness T in the cross section of the glass tube.
The heat sink has the surface on the center side of the glass tube as the substrate mounting surface.
The ratio of the width H and the inner diameter Y of the heat sink is 5:24 or more and 20:24 or less, and
The ratio of the thickness C of the heat sink to the inner diameter Y is 4:24 or more and 12:24 or less,
3. The illumination lamp according to claim 2, wherein the substrate mounting surface is disposed at a position that is 1/6 or more and less than 1/2 of the inner diameter Y of the glass tube from the inner surface of the glass tube.   The ratio of the weight V of a heat sink and the weight W of a glass tube is 1: 3 or more and 1: 1 or less, The illumination lamp in any one of Claims 2-4 characterized by the above-mentioned.   6. The illumination lamp according to claim 2, wherein the center of gravity G exists on the board mounting surface.   The illumination lamp according to any one of claims 1 to 6, wherein a scattering prevention film is provided on an outer surface of the glass tube.   A railway vehicle comprising the illumination lamp according to any one of claims 1 to 7.   The illumination lamp according to any one of claims 1 to 7, an underground station building, an underground road, an underground shopping street, a tunnel, a basement, a dome, an indoor, or the like, in which no external light is incident upon disaster evacuation, or a building in which external light cannot be expected A method of using an illumination lamp characterized by being used in equipment or a place.

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