JP5511346B2 - LED lamps used in place of light bulbs for traffic lights - Google Patents

Description

  The present invention relates to a lamp having LED as a light source used in a traffic signal instead of a conventional light bulb.

  Light bulbs are used as lamps for traffic lights. Since the light bulb has low luminous efficiency, it has a drawback of high power consumption. In addition, since the lifetime is as short as several thousand hours, there is a drawback in that it is necessary to replace it regularly, and maintenance is troublesome. Further, in order to simplify the maintenance, if the life of the bulb is designed to be long, there is a drawback that the light emission efficiency is drastically lowered and the power consumption is increased. The luminous efficiency and lifetime of a light bulb are mutually contradictory characteristics, and both cannot be satisfied at the same time. In order to solve this drawback, LED lamps for traffic signals using LEDs as light sources instead of light bulbs have been developed. (See Patent Document 1)

JP 2000-294002 A

  In a lamp using an LED as a light source, it is important how to dissipate the heat generated by the LED. This is because the temperature rise of the LED shortens the lifetime of the LED and decreases the light emission efficiency. Since an LED is a semiconductor light emitting element, a low temperature environment that is incomparable with a light bulb that emits light by heating a filament in red is required.

  As shown in FIG. 1, the LED lamp of Patent Document 1 includes an aluminum plate 93 and a support column 94 connected to the aluminum plate 93 in order to dissipate heat generated by the LED 92. The aluminum plate 93 is thermally coupled to the LED 92 having a high mounting density and dissipates heat generated by the LED 92. Further, the heat conducted to the aluminum plate 93 is conducted to the support column 94 and radiated from the support column 94 to the outside of the lamp.

  The LED lamp of FIG. 1 dissipates heat by conducting heat generated by the LED 91 to the support column 93 via the aluminum plate 92. However, the LED lamp with this structure has a drawback that it cannot efficiently dissipate heat from the column. This is because, in addition to the small heat dissipation area of the support column, this is arranged in a closed space inside the traffic signal. FIG. 2 shows a cross-sectional view of the traffic signal. As shown in this figure, the traffic signal has a lamp 81 fixed to the central part of the reflector 4 and the front surface thereof is closed with a translucent cover 9 made of glass or transparent plastic.

  The reflector 4 is provided with an opening 41 at the center, and is connected so that the lamp holder 3 can be attached and detached. The opening 41 has an inner shape larger than the outer shape of the lamp 81 so that the lamp 81 can be taken in and out and replaced. The opening 41 is provided with a cylindrical tubular protruding portion 42 that protrudes to the outside so that the lamp holder 3 can be easily attached and detached. The lamp holder 3 has a cylindrical connecting tube portion 32 that is inserted and connected to the inside of the cylindrical protruding portion 42, and the opening portion 41 of the reflector 4 is closed on the front surface of the connecting tube portion 32. A ring plate 31 is provided. The ring plate 31 is provided with an inner cylinder 33 at the center, and a socket 5 to which a lamp 81 is screwed and connected is fixed to the rear end of the inner cylinder 33.

The traffic signal described above replaces the lamp 81 as follows.
(1) The lamp holder 3 is pulled out from the cylindrical protrusion 42 of the reflector 4 and removed from the reflector 4.
(2) Replace the lamp 81 of the lamp holder 3 with a new one while being removed from the reflector 4.
(3) Thereafter, the connecting cylinder portion 32 of the lamp holder 3 is inserted into the cylindrical protrusion 42 of the reflector 4 and connected to the reflector 4. In order to fix the lamp holder 3 in a state where the lamp holder 3 is inserted into the opening 41 of the reflector 4, the reflector 4 is provided with a connector 8 made of an elastic spring.

  As described above, by replacing the light bulb with the LED lamp, the life of the lamp can be extended and the power consumption can be extremely reduced due to the high luminous efficiency. However, since the LED lamp shown in FIG. 1 dissipates the heat of the support to the inside of the reflector, there is a drawback that the heat of the LED is trapped inside the reflector and cannot be radiated efficiently.

  The first object of the present invention is to solve the above-mentioned drawbacks, that is, to replace the light bulb for a traffic light that can extend the life of the LED and increase the light emission efficiency by dissipating the heat of the LED very efficiently. It is to provide an LED lamp to be used.

Furthermore, LED lamps for traffic signals used in place of light bulbs are also required to have strength against vibration. This is because the traffic light is vibrated by a heavy truck passing on the road. In particular, since the traffic signal is fixed to the end of a long and narrow pillar, even a slight vibration of the road is greatly swung by the long pillar. The traffic signal is provided with a socket for connecting the bulb so that the bulb can be screwed and replaced. In a light bulb that is screwed into a socket, a glass bulb containing a filament is fixed to a metal connecting portion that is connected to the socket. The connecting portion is formed by processing a metal plate into a cylindrical shape having an external thread on the outer peripheral surface. In the conventional traffic light using a light bulb, a light glass bulb is fixed to the connecting portion. Therefore, even if the connecting portion is vibrated, the connecting portion between the connecting portion and the glass bulb is not damaged. However, since the LED lamp is considerably heavier than a light bulb, there is a drawback that when the connecting portion is vibrated, it is easily damaged at the boundary portion with the connecting portion. In particular LED lamp used in place of the bulb from being connected to the socket for connecting the light bulb, it is necessary to make the structure of the connecting portion in the same structure as the light bulb. This connection structure can connect a light bulb with a structure strong against vibration, but cannot connect a heavy LED lamp in a state of realizing excellent vibration strength.

  The second object of the present invention is to provide an LED lamp for traffic signals that can improve the excellent vibration resistance strength while being used in place of a light bulb.

Means for Solving the Problems and Effects of the Invention

  The LED lamp used instead of the traffic light bulb described in claim 1 of the present invention is detachably set in the opening 41 provided in the central portion of the reflector 4 that reflects light on the surface. The lamp holder 3 is connected to be exchangeable. The LED lamp has a radiator 6 that dissipates heat generated by the LED 2 that is a light source. The radiator 6 has a contact portion 61 that is in thermal contact with the inner exposed surface 31A of the ring plate 31 of the lamp holder 3 that closes the opening 41 of the reflector 4, and contacts the heat of the radiator 6. The heat is conducted to the lamp holder 3 through the part 61 and is radiated through the lamp holder 3.

  The above LED lamp has the feature that it can dissipate the heat generated by the LED very efficiently while using it instead of a light bulb for a traffic signal, thereby extending the life of the LED and increasing the luminous efficiency. The LED lamp includes a radiator that dissipates the heat generated by the LED, which is a light source, and the radiator heats the contact portion on the inner exposed surface of the ring plate of the lamp holder that closes the opening of the reflector. This is because the heat is radiated by conducting heat from the radiator to the lamp holder in contact with each other in a coupled state. In this way, the structure that conducts heat from the radiator to the ring plate of the lamp holder effectively radiates heat, effectively preventing the LED heat from being trapped inside the reflector, and dissipating the lamp extremely efficiently. High luminous efficiency can be realized while extending the service life.

  The LED lamp of the present invention includes a constant current element 19 that limits the current of the LED 2 of the light source. The constant current element 19 is thermally coupled to the radiator 6, and the heat generated by the constant current element 19 is radiated by the radiator 6. can do.

  In the LED lamp of the present invention, the contact portion 61 of the radiator 6 can be elastically pressed and brought into contact with the inner exposed surface 31A of the ring plate 31.

  In the LED lamp of the present invention, the contact portion 61 of the radiator 6 has a bellows shape extending toward the inner exposed surface 31A of the ring plate 31, and the bellows 61A is elastically extended to contact the inner exposed surface 31A of the ring plate 31. Can be made.

  The LED lamp used in place of the traffic light bulb described in claim 5 of the present invention is detachably set in the opening 41 provided in the central portion of the reflector 4 that reflects light on the surface. It is screwed into the socket 5 of the lamp holder 3 and is connected to be exchangeable. The LED lamp includes a connecting portion 11 having a male screw 12 provided on the outer periphery thereof which is screwed and connected to the socket 5 of the lamp holder 3, and a lamp body 10 fixed to the connecting portion 11. The lamp body 10 has an elastic support ring 7 that elastically contacts the lamp holder 3 to support the lamp body 10, and is elastically supported in a state where the connecting portion 11 is screwed and connected to the socket 5 of the lamp holder 3. The ring 7 is in contact with the lamp holder 3 and supports the lamp body 10.

  The above LED lamps can improve excellent vibration resistance strength while being used in place of a traffic light bulb. It is provided with an elastic support ring that elastically contacts the lamp holder and supports the lamp body, and the LED lamp is elastic in a state where the LED lamp is connected to the socket by screwing the connecting portion into the socket of the lamp holder. This is because the support ring is brought into contact with the lamp holder to support the lamp body. This LED lamp supports the elastic support ring by elastically contacting the lamp holder in a state where the connecting portion is connected to the socket, so that an LED lamp that is heavier than a light bulb is connected to a socket for connecting the light bulb. Excellent vibration strength can be realized.

  In the LED lamp of the present invention, the elastic support ring 7 is an elastic ring that comes into contact with the inner surface 34A of the center hole 34 of the lamp holder 3 provided with the socket 5 at the bottom in an elastically pressed state. A guide groove 25 for guiding the elastic support ring 7 can be provided on the outer peripheral surface of the insertion portion 21 inserted into the center hole 34 of the holder 3, and the elastic support ring 7 can be guided in the guide groove 25.

In the LED lamp according to claim 5 of the present invention, the elastic support ring 7 is made of a heat conductive rubber that conducts heat of the lamp body 10 to the lamp holder 3 .
In this LED lamp, since the elastic support ring is made of a heat conductive rubber, the heat generated in the lamp body can be conducted to the lamp holder and effectively radiated.

In the LED lamp of the present invention, the elastic support ring 7 can be either a rubber-like elastic body formed by adding silicon rubber or heat conductive powder.
The LED lamp can effectively dissipate heat by conducting heat generated in the lamp body to the lamp holder while making the elastic support ring have excellent elasticity.

It is sectional drawing of the conventional LED lamp. It is sectional drawing of the traffic signal apparatus which uses a light bulb. It is a disassembled perspective view which shows an example of the traffic signal apparatus which uses the LED lamp concerning one Example of this invention instead of a light bulb. It is a back surface perspective view of the reflector of the traffic signal apparatus shown in FIG. It is a disassembled perspective view which shows the state which removed the lamp holder from the reflector of the traffic signal apparatus shown in FIG. It is a disassembled perspective view which shows the state which removed the lamp holder from the reflector shown in FIG. It is sectional drawing which shows the connection structure of the reflector and lamp holder of the traffic signal apparatus shown in FIG. It is sectional drawing which shows the connection structure of the LED lamp shown in FIG. 7, and a lamp holder. It is sectional drawing of the LED lamp and lamp holder shown in FIG. It is the figure which removed the translucent cover of the LED lamp shown in FIG. It is the XI-XI sectional view taken on the line of the LED lamp shown in FIG. It is a schematic circuit diagram of the LED lamp concerning one Example of this invention. It is sectional drawing which shows the connection structure of the LED lamp concerning another Example of this invention, and a lamp holder. It is sectional drawing which shows the connection structure of the LED lamp concerning another Example of this invention, and a lamp holder.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies an LED lamp used in place of a traffic light bulb for embodying the technical idea of the present invention. Not specified.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  A traffic signal using the LED lamp of the present invention is shown in FIGS. The traffic signal device shown in these figures shows a pedestrian traffic light. However, the present invention does not specify a traffic signal as a traffic signal for a pedestrian, and can be a traffic signal for a vehicle.

  The LED lamp 1 shown in FIGS. 3 to 7 is connected via a lamp holder 3 to an opening 41 provided in the center of the reflector 4 so that it can be replaced in place of a light bulb. The traffic signal device that connects the LED lamp 1 via the lamp holder 3 has an opening 41 at the center of the reflector 4 that reflects light on the surface, so that the lamp holder 3 can be attached to and detached from the opening 41. It is connected. The LED lamp 1 is not directly connected to the reflector 4 but connected to the lamp holder 3 so that it can be replaced. When the traffic light is replaced, the lamp holder 3 is removed from the reflector 4, and in this state, the lamp of the lamp holder 3 is replaced with a new one, and the lamp holder 3 on which a new lamp is set is set on the reflector 4. To do. FIGS. 8 to 10 show the lamp holder 3 and the LED lamp 1 removed from the reflector 4.

  The lamp holder 3 is manufactured by pressing a metal plate. The lamp holder 3 has a cylindrical connecting cylinder portion 32 that is inserted into and connected to the inside of a cylindrical protruding portion 42 provided at the center of the reflector 4 so as to protrude rearward. A ring plate 31 that closes the opening 41 of the reflector 4 is provided on the front surface of the connecting cylinder portion 32. Further, the ring plate 31 is provided with a center hole 34 in the lamp holder 3 by connecting an inner cylinder 33 at the center. A socket 5 to which a light bulb is screwed and connected is fixed to the rear end of the inner cylinder 33 constituting the center hole 34, that is, the bottom of the center hole 34. The socket 5 is provided with a female screw 52 on the inner surface in order to screw and connect the male screw 12 of the bulb.

  As shown in FIGS. 8 and 9, the LED lamp 1 includes a connecting portion 11 that is screwed and connected to the socket 5 of the lamp holder 3, and a lamp body 10 that is fixed to the connecting portion 11. The connecting portion 11 is provided with a male screw 12 on the outer periphery so that it can be screwed into a female screw 42 of the socket 5 for connection. Further, like the light bulb, the connecting portion 11 is provided with electrodes 13 and 14 on the outer peripheral surface and the tip so as to be insulated from each other.

  The lamp body 10 includes a connection holding unit 20 connected to the lamp holder 3, a plurality of LEDs 2 arranged at fixed positions via a circuit board 15 fixed in front of the connection holding unit 20, and a connection holding unit 20. And a translucent cover 16 that covers the front surface.

  The connection holding part 20 is integrally formed of plastic into a shape formed by connecting a disc-shaped flange part 22 to one end of a columnar insertion part 21 inserted into the center hole 34 of the lamp holder 3. The outer shape of the insertion portion 21 is smaller than the outer shape of the center hole 34 so that the insertion portion 21 can be inserted into the center hole 34 of the lamp holder 3. The insertion portion 21 to be inserted into the center hole 34 is fixed by covering the connecting portion 11 at the tip thereof. The collar portion 22 is positioned in front of the ring plate 31 and arranged in a posture away from the ring plate 31. The collar portion 22 fixes the circuit board 15 in front of it. The flange portion 22 shown in the figure is provided with a fixing rib 23 protruding from the front surface, and a fixing screw 23 penetrating the circuit board 15 is screwed into the fixing rib 23 to fix the circuit board 15 in a fixed position. In the LED lamps of FIGS. 9 to 11, six rectangular circuit boards 15A are arranged in a hexagonal cylindrical shape, and a polygonal or circular circuit board 15B is arranged on the front end face of these circuit boards 15A. ing. The circuit board 15B disposed in front is bonded or locked and fixed to the end faces of the six circuit boards 15A.

  The plurality of LEDs 2 are fixed to the circuit board 15 and arranged at fixed positions on the lamp body 10. The LED lamp 1 shown in the figure has five LEDs 2 fixed to six circuit boards 15A arranged in a hexagonal shape, and six LEDs 2 fixed to a circuit board 15B arranged on the front end surface. In total, 36 LEDs are fixed. These LEDs 2 are fixed to each circuit board 15 at a predetermined interval. However, the plurality of circuit boards can be arranged in a triangular or pentagonal shape, or in a polygonal shape that is a heptagon or more. For example, a structure in which a plurality of circuit boards are arranged in a pentagonal shape can fix five LEDs on each circuit board and arrange a total of 30 LEDs, or a plurality of circuit boards arranged in a heptagonal shape. In the structure, four LEDs are fixed to each circuit board, and a total of 32 LEDs can be arranged. However, the number of LEDs fixed to the circuit board can be variously changed according to the number and arrangement of the circuit boards, and further, the rated voltage of the LEDs and the required brightness. As the LED lamp, for example, 6 to 100 LEDs can be arranged.

  FIG. 12 shows a schematic circuit diagram of the LED lamp 1. As shown in this figure, the LED lamp has a plurality of LEDs 2 connected in series between electrodes 13 and 14 provided on the outer peripheral surface and the tip of the connecting portion 11. The LED lamp 1 is supplied with commercial power and lights a plurality of LEDs 2. The LED lamp 1 is connected to the output side of the rectifier circuit 18 that rectifies and converts the input AC power source into a direct current, and is connected to the output side of the rectifier circuit 18 to limit the current of the LED 2 to a constant current value. And a current element 19.

  The rectifier circuit 18 is a diode bridge 18A. The diode bridge 18A converts the input AC power source to DC and outputs DC rectified to the plus side and the minus side of a series circuit formed by connecting a plurality of LEDs 2 in series. The number of LEDs 2 connected in series is specified by the supplied power supply voltage and the rated voltage of the LEDs 2. For example, an LED lamp that supplies AC 100V AC power as a commercial power source can be lit by connecting 30 to 40 LEDs in series with a rated voltage of 3V. Since the LED lamp 1 shown in the figure includes 36 LEDs 2, all the LEDs 2 are connected in series. However, a plurality of LEDs can be connected in series and in parallel.

  The translucent cover 16 has translucency capable of transmitting the light emitted from the plurality of LEDs 2 arranged in the connection holding unit 20 to the outside. The translucent cover 16 is formed of plastic or glass so that a plurality of circuit boards 15 fixed in front of the connection holding part 20 can be accommodated therein. The translucent cover 16 of FIGS. 8 and 9 is formed in a shape in which a spherical portion 16B is provided at the tip of a cylindrical portion 16A, and a plurality of circuits fixed to the connection holding portion 20 inside the cylindrical portion 16A. The board | substrate 15 is accommodated. The translucent cover 16 is fixed in front of the connection holding unit 20 and transmits the light emitted from the LED 2 serving as a light source housed inside to the outside. The translucent cover 16 is fixed to the outer peripheral edge portion of the flange portion 22 of the connection holding portion 20 by bonding, screwing, or also with a locking structure.

  Further, the translucent cover 16 shown in the figure has an opening 17 for ventilating the air inside. In the translucent cover 16 shown in FIGS. 8 and 11, a plurality of rows of slits extending in the circumferential direction are opened in the cylindrical portion 16A to form a ventilation port 17. The slit-shaped ventilation openings 17 are opened at equal intervals in the circumferential direction. Furthermore, slit-shaped ventilation openings 17 provided in the circumferential direction are opened at equal intervals in the axial direction, and a plurality of rows of ventilation openings 17 are provided on the outer peripheral surface of the cylindrical portion 16A. Thus, the LED lamp 1 having the ventilation port 17 in the translucent cover 16 ventilates the air inside the translucent cover 16 to the outside, and effectively radiates the heat generated by the LED 2 as the light source by air convection. it can.

  Furthermore, the LED lamp 1 shown in the figure includes a radiator 6 that radiates heat generated by the LED 2 that is a light source. The radiator 6 has a contact portion 61 that is in thermal contact with the inner exposed surface 31 </ b> A of the ring plate 31 of the lamp holder 3 that closes the opening 41 of the reflector 4. The lamp body 10 shown in the figure has the contact portion 61 of the radiator 6 fixed to the back surface of the flange portion 22 and the surface facing the ring plate 31. This contact portion 61 has a structure in which the inner exposed surface 31 </ b> A of the ring plate 31 is elastically pressed to contact.

  The contact portion 61 shown in FIGS. 8 to 10 is formed by forming a thin metal plate into a bellows shape extending toward the inner exposed surface 31 </ b> A of the ring plate 31. The bellows 61A made of a metal plate has a structure in which ring portions having different inner shapes are alternately stacked, and elastically deforms in the axial direction when these ring portions reciprocate in the axial direction. The elastically deformed bellows 61 </ b> A is sandwiched between the flange portion 22 and the ring plate 31 of the lamp body 10 in a state where the LED lamp 1 is screwed into the socket 5 of the lamp holder 3 and is connected to the surface of the flange portion 22. The inner exposed surface 31 </ b> A of the plate 31 is brought into contact with each other in a pressed state and thermally coupled. In particular, the bellows 61A made of a metal plate can realize excellent heat conduction by bringing wide end surfaces into contact with the flange portion 22 and the inner exposed surface 31A with a wide contact area. Therefore, the heat generated by the LED incorporated in the LED lamp is thermally conducted to the ring plate through the contact portion, so that the heat generated by the LED 2 can be efficiently radiated. However, the bellows can be made of plastic. The plastic bellows can be made into a bellows-like shape by adding a heat conductive powder to achieve excellent thermal conductivity and elasticity.

  Further, the contact portion 61 shown in FIG. 13 is a rubber-like ring 61B that elastically presses the inner exposed surface 31A of the ring plate 31. The contact portion 61, which is a rubber ring 61B, is formed by molding a heat conductive rubber into a ring shape having a predetermined thickness. This rubber-like ring 61B is a rubber-like elastic body formed by adding silicon rubber or heat conductive powder. The contact portion 61, which is a rubber ring 61B, is also sandwiched between the flange portion 22 and the ring plate 31 of the lamp body 10 in a state where the LED lamp 1 is screwed into the socket 5 of the lamp holder 3 and connected. And the inner exposed surface 31A of the ring plate 31 are brought into contact with each other while being pressed against each other and thermally coupled. The contact portion 61, which is a rubber ring 61B, can be easily and inexpensively manufactured, and can realize excellent heat conduction by bringing both end surfaces into close contact with the flange portion 22 and the inner exposed surface 31A.

  Furthermore, since the above LED lamp 1 arrange | positions the bellows 61A or rubber-like ring 61B which contacts elastically between the collar part 22 and the ring plate 31 as the contact part 61 of the heat radiator 6, compared with a light bulb. In addition, the heavy LED lamp 1 is supported by the contact portion 61 so that excellent vibration strength can be realized.

  Furthermore, the radiator 6 of the LED lamp 1 shown in FIGS. 9, 11, and 13 is a circuit board in which the LED 2 is fixed in order to more efficiently conduct heat generated by the LED 2 as a light source to the contact portion 61. The heat conduction plate 62 is arranged on the inner surface of the 15. The heat conducting plate 62 is obtained by bending a metal plate so that the plurality of circuit boards 15 can be fixed at predetermined positions. In the illustrated LED lamp 1, six circuit boards 15 </ b> A are arranged in a hexagonal cylindrical shape, and the circuit board 15 </ b> B is fixed to the front end face, so that the heat conduction plate 62 is attached to the inner surfaces of these circuit boards 15. It is bent into a shape that can be contacted and thermally coupled. In the illustrated radiator 6, the heat conduction plate 62 is disposed in the heat coupling state on the inner surfaces of all the circuit boards 15, so that the circuit board 15 B disposed on the front end face is rectified as shown in FIGS. 9 and 13. While arranging members that generate heat in the energized state such as the circuit 18 and the constant current element 19, these members are placed in a thermally coupled state to the radiator 6, and the heat generated by these members can also be effectively dissipated by the radiator 6.

  Further, the heat conduction plate 62 has a leading end on the ring plate 31 side penetrated through the flange portion 22 and is pulled out to the outside, and the contact portion 61 is connected to the lead-out portion 62A in a thermally coupled state. The connection holding part 20 can insert-mold the heat conducting plate 62 and allow the lead part 62A to penetrate the flange part 22. However, the connection holding part can also be provided with a slit that penetrates the lead part of the heat conducting plate in the collar part, and the lead part can be inserted through this slit to penetrate the collar part. The lead-out portion 62 </ b> A that penetrates the flange portion 22 is bent along the surface of the flange portion 22 on the back surface of the flange portion 22, and is thermally coupled to the contact portion 61 in a wide area.

  Further, the LED lamp shown in FIG. 14 includes a lamp body 10 that elastically contacts the lamp holder 3 to support the lamp body 10. In the illustrated LED lamp 1, the elastic support ring 7 is fixed to the outer peripheral surface of the insertion portion 21 of the lamp body 10 inserted into the center hole 34 of the lamp holder 3 having the socket 5 at the bottom. The lamp body 10 is provided with a guide groove 25 for guiding the elastic support ring 7 on the outer peripheral surface of the insertion portion 21, and the elastic support ring 7 is guided and fixed in the guide groove 25. The elastic support ring 7 is an elastic ring that contacts the inner surface 34A of the center hole 34 of the lamp holder 3 in an elastically pressed state. The elastic support ring 7, which is an elastic ring, is press-fitted into the gap between the insertion portion 21 of the lamp body 10 and the inner surface 34 </ b> A of the center hole 34 in a state where the LED lamp 1 is screwed into the socket 5 of the lamp holder 3. The outer peripheral surface of the insertion portion 21 and the inner surface 34A of the center hole 34 are in contact with each other while being pressed against each other. For this reason, the LED lamp 1 contacts the lamp holder 3 via the elastic support ring 7 and is supported while the lamp body 10 has excellent vibration strength. The LED lamp 1 shown in the drawing is provided with one row of elastic support rings 7 on the outer peripheral surface of the insertion portion 21, but the LED lamp can be provided with a plurality of rows of elastic support rings.

  Further, the elastic support ring 7 can be a heat conducting rubber that conducts heat from the lamp body 10 to the lamp holder 3. The elastic support ring is made of, for example, silicon rubber or a rubber-like elastic body to which heat conductive powder is added. These elastic support rings can realize the feature of effectively radiating heat by conducting heat of the lamp body to the lamp holder while stably supporting the lamp body connected to the lamp holder as excellent elasticity. .

  Furthermore, although not shown, the LED lamp can be provided with both the aforementioned radiator and the elastic support ring in the lamp body. This LED lamp can realize excellent heat dissipation characteristics while being connected to the lamp holder with excellent vibration strength.

1 ... LED lamp 2 ... LED
DESCRIPTION OF SYMBOLS 3 ... Lamp holder 4 ... Reflector 5 ... Socket 6 ... Radiator 7 ... Elastic support ring 8 ... Connection tool 9 ... Translucent cover 10 ... Lamp main body 11 ... Connection part 12 ... Male screw 13 ... Electrode 14 ... Electrode 15 ... Circuit board 15A ... Circuit board
15B ... Circuit board 16 ... Translucent cover 16A ... Cylindrical part
16B ... spherical part 17 ... ventilation port 18 ... rectifier circuit 18A ... diode bridge 19 ... constant current element 20 ... connection holding part 21 ... insertion part 22 ... hook part 23 ... fixing rib 24 ... set screw 25 ... guide groove 31 ... ring plate 31A ... Inner exposed surface 32 ... Connecting cylinder part 33 ... Inner cylinder 34 ... Center hole 34A ... Inner face 41 ... Opening part 42 ... Cylindrical protrusion 52 ... Female screw 61 ... Contact part 61A ... Bellows
61B ... Rubber ring 62 ... Heat conduction plate 62A ... Drawer 81 ... Lamp 92 ... LED
93 ... Aluminum plate 94 ... Prop

Claims (6)

A light source that is interchangeably connected to an opening (41) provided in the center of the reflector (4) that reflects light on the surface via a lamp holder (3) that is detachably set is an LED (2 LED lamps used in place of light bulbs for traffic lights,
It has a radiator (6) that dissipates the heat generated by the LED (2) that is the light source, and this radiator (6) of the lamp holder (3) closes the opening (41) of the reflector (4). It has a contact portion (61) that contacts and is thermally coupled to the inner exposed surface (31A) of the ring plate (31), and the heat of the radiator (6) passes through the contact portion (61) to the lamp holder (3). An LED lamp used in place of a light bulb for a traffic signal device, characterized in that it is conducted to the heat and radiated through a lamp holder (3). It has a constant current element (19) that limits the current of the LED (2) of the light source, and this constant current element (19) is in a thermally coupled state to the radiator (6), and the constant current element (19) generates heat. An LED lamp used in place of a light bulb for a traffic signal device according to claim 1 , wherein the heat is dissipated by a radiator (6).   The light bulb for a traffic signal according to claim 1 or 2, wherein the contact portion (61) of the radiator (6) is elastically pressed and contacts the inner exposed surface (31A) of the ring plate (31). LED lamp used in place of.   The contact portion (61) of the radiator (6) has a bellows shape extending toward the inner exposed surface (31A) of the ring plate (31), and the bellows (61A) elastically extends to form a ring plate (31). The LED lamp used instead of the light bulb for traffic signals as described in any one of Claims 1 thru | or 3 which contacts an inner side exposed surface (31A). Screwed into the socket (5) of the lamp holder (3), which is detachably set in the opening (41) provided in the center of the reflector (4) that reflects light on the surface, is exchangeably connected. An LED lamp that is used in place of a light bulb for a traffic signal with a light source LED (2),
A connecting part (11) provided with a male screw (12) on the outer periphery to be screwed and connected to the socket (5) of the lamp holder (3), and a lamp body (10) fixed to the connecting part (11) )
The lamp body (10) has an elastic support ring (7) that elastically contacts the lamp holder (3) and supports the lamp body (10),
The elastic support ring (7) is a heat conductive rubber that conducts heat of the lamp body (10) to the lamp holder (3),
With the connecting portion (11) screwed into the socket (5) of the lamp holder (3) and connected, the elastic support ring (7) contacts the lamp holder (3), and the lamp body (10) is attached. An LED lamp used in place of a light bulb for a traffic light that is designed to support it. The LED lamp used in place of a light bulb for a traffic signal device according to claim 5 , wherein the elastic support ring (7) is one of silicon rubber and a rubber-like elastic body to which heat conductive powder is added.

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