JP2010135181A - Illuminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating device capable of improving a heat-dissipation capability, while suppressing the generation of a temperature gradient at the supporting member of a light source. <P>SOLUTION: The illuminating device is equipped with LEDs 2 a translucent cover 4 internally having the LEDs 2 and passing the light from the LEDs 2 a supporting tube 1 to support the LEDs 2 and a cooling-medium flow channel to flow air serving as a cooling medium inside and outside of the supporting tube 1. Accordingly, the arrangement described above can cool the supporting tube 1 through natural convection from both sides. In other words, it can cool mounting substrates 21 from both sides, resulting in the improvement of heat-dissipation capability. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device configured to improve heat dissipation by natural convection.

  The lighting device generally contains a heat-generating component such as a light source. For this reason, in order to ensure the performance of the heat generating component housed inside, it is necessary to configure the lighting device so as to suppress the temperature rise of the heat generating component and suppress the temperature increase of the outer surface of the lighting device from the viewpoint of safety. There is. In particular, in an illuminating device using a light emitting diode (hereinafter referred to as LED) as a light source, as the temperature of the LED rises, the lifetime characteristic of the LED deteriorates, the light emission efficiency decreases, and it becomes difficult to secure a necessary amount of light. Since there is a possibility that a problem may occur, it is necessary to have a structure with good heat dissipation in order to suppress the temperature rise of the LED. In view of this, lighting devices having various heat dissipation structures have been proposed in order to dissipate the heat generated by the heat generating components to the outside air (see, for example, Patent Document 1).

The LED lamp disclosed in Patent Document 1 includes an LED element that is a light source, a support member that supports a mounting board on which the LED element is mounted, and a bulb that houses the mounting board. In this LED lamp, the support member is passed through a pair of opposed holes provided in the wall of the bulb, the heat from the LED element is transmitted to the support member, and the transmitted heat is transmitted to the support member. Heat is dissipated from the internal fluid to the external air. By comprising in this way, heat dissipation can be improved and the temperature rise of an LED element can be suppressed.
JP 2004-296245 A

  However, the LED lamp disclosed in Patent Document 1 has a configuration in which heat from the LED element is radiated to air as a cooling medium only from the inside of the support member, and thus there is a problem that heat radiation is not sufficiently performed. In addition, heat from the LED element is transferred to the mounting substrate and the support member, and is radiated from the support member to the air that is the cooling medium. Depending on the material of the mounting substrate or the insulating member of the mounting substrate and the support member, the heat transfer However, there is a risk that heat is not sufficiently released.

  This invention is made | formed in view of such a situation, and it aims at providing the illuminating device which can improve heat dissipation.

  The illuminating device according to the present invention is a illuminating device including a light source, a translucent container that houses the light source therein and transmits light from the light source, and a support cylinder that supports the light source; A cooling medium flow path for flowing the cooling medium inside and outside the cylinder is provided.

  In the present invention, the cooling medium flow path for flowing the cooling medium is provided inside and outside the support cylinder that supports the light source. By appropriately providing the cooling medium flow path, it is possible to cool the support cylinder from both sides by natural convection and to improve heat dissipation.

  The illuminating device according to the present invention includes a fixing portion that fixes the support cylinder, and the fixing portion is provided with a flow hole through which the cooling medium passes.

  In the present invention, the flow hole is provided so that the cooling medium can pass through the fixing portion for fixing the support cylinder. By appropriately providing the flow holes, the cooling medium can be made to flow so as to pass through the inside and outside of the support cylinder by natural convection.

  The illuminating device according to the present invention includes a hollow holding portion that holds the fixing portion and has a cavity therein, and communicates the inside of the translucent container and the hollow holding portion with the support cylinder and the flow hole. It is characterized by being.

  In the present invention, the inside of the translucent container that transmits light from the light source and the hollow holding portion that holds the fixing portion is communicated with each other by the support cylinder and the flow hole. By appropriately providing the flow holes, it is possible to form a natural gap between the inside of the translucent container that contains the light source that is a heat-generating component and the inside of the hollow holding part that has a lower temperature than the translucent container. It becomes possible to circulate the cooling medium so as to flow along the inside and outside of the support cylinder by convection. The heat from the light source is transmitted from the cooling medium to the translucent container and dissipated to the outside air. As a result, the inner side and the outer side of the support cylinder can be cooled in the same way by natural convection, and heat dissipation can be improved.

  The illuminating device according to the present invention includes a heat dissipating part that is connected to the fixing part and dissipates heat from the light source.

  In the present invention, since the heat radiating part for radiating the heat from the light source is connected to the fixed part, the heat from the light source is transferred to the outside air by the cooling medium circulating inside the lighting device as described above. In addition to being diffused, it is directly transmitted from the support cylinder and the fixed part to the heat radiating part by heat conduction, and is radiated from the heat radiating part to the outside air, so that the heat dissipation can be further improved.

  The illuminating device according to the present invention is characterized in that the translucent container has a bottomed cylindrical shape, and the translucent container and the support tube are arranged substantially concentrically.

  In the present invention, since the translucent container having the bottomed cylindrical shape and the support cylinder are disposed substantially concentrically, the area through which the cooling medium passes covers substantially the entire length in the longitudinal direction of the support cylinder. Can be made approximately equal. As a result, natural convection can be generated so that the cooling medium circulates smoothly inside and outside the support cylinder, and heat dissipation can be further improved.

  In the illumination device according to the present invention, the light source is an LED.

  In the present invention, an LED is used as the light source. Since the LED is small and has a high degree of freedom in layout design, by appropriately arranging the LED in the support cylinder, the heat generated by the LED is efficiently transmitted to the air flowing inside and outside the support cylinder, and externally It becomes possible to dissipate into the air.

  According to the present invention, heat dissipation can be improved.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a schematic external perspective view of lighting apparatus 100 according to Embodiment 1 of the present invention. FIG. 2 is a schematic exploded perspective view of the lighting device 100. FIG. 3 is a schematic longitudinal sectional view of the lighting device 100. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.

  In the figure, reference numeral 1 denotes a support cylinder that supports the light source. As shown in FIG. 2, the support tube 1 has a rectangular tube shape, and is made of a metal such as aluminum, for example.

  The support cylinder 1 is provided with a plurality (four in the figure) of mounting substrates 21, 21,... On which a plurality (five in the figure) of LEDs 2, 2,. The LED 2 is, for example, a surface-mounted LED that includes an LED element, a sealing resin in which the LED element is sealed and phosphors are dispersed, and an input terminal and an output terminal. The LEDs 2, 2,... Are mounted on the one surface 21a of the mounting board 21 having an elongated rectangular plate shape with an appropriate distance from each other along the longitudinal direction of the mounting board 21. The mounting substrate 21 is preferably made of a metal such as aluminum.

  .. Are mounted on the other surfaces 21b, 21b... Along the longitudinal direction of the support cylinder 1 on the respective planes of the outer peripheral surface 1a of the support cylinder 1. It is more desirable to interpose a heat conductive sheet or grease between the mounting boards 21, 21... And the support cylinder 1.

  The mounting cylinders 21, 21, on which the LEDs 2, 2... Are mounted are fixed to a fixing base 3 that is a fixing portion. The fixing base 3 is a flat plate comprising a disk-shaped support cylinder fixing plate 31 and a cylindrical fixed cylinder 32 which is provided on the periphery of the support cylinder fixing plate 31 and to which a heat radiating portion 5 described later is fixed. It has a bottomed cylindrical shape. The fixed base 3 is made of a metal such as aluminum and is integrally formed.

  In the approximate center of the support cylinder fixing plate 31, a fixing hole 31a is provided which is rectangular and to which the support cylinder 1 is fixed. Further, the support cylinder fixing plate 31 is provided with a plurality of flow holes 31b, 31b,... At equal positions in the circumferential direction at positions where each of the through holes 31b, 31b,. is there. The support cylinder 1 is fixed in a state where one end side is inserted into the fixing hole 31a of the fixing base 3 and one end protrudes to the inside of the fixing base 3 by an appropriate length as shown in FIG. As a result, as shown in FIG. 4, the circumferential positions of the LEDs 2, 2... And the circulation holes 31 b, 31 b, are substantially the same, and the circulation holes 31 b, 31 b, are located between the translucent cover 4 and the support cylinder 1. To position. In the present embodiment, the flow holes 31b, 31b,... Provided in the lighting device 100 that is mounted upward (the mounting direction in which the LEDs 2, 2,.

  The fixing base 3 has a bottomed cylindrical shape, and a translucent cover 4 which is a translucent container that transmits light accommodates the LEDs 2, 2. It is attached to the 31 side. In addition, in FIG. 1, the external appearance perspective view of the illuminating device 100 which abbreviate | omitted the translucent cover 4 for convenience of description is shown, and the translucent cover 4 is shown with the dashed-two dotted line. The translucent cover 4 covers and protects the LEDs 2, 2... And the mounting substrates 21, 21, and transmits light from the LEDs 2, 2. The translucent cover 4 is made of, for example, a polycarbonate resin excellent in impact resistance and heat resistance, and has an end portion fitted on the fixing base 3 and fixed thereto as shown in FIG.

  Further, the fixing base 3 is provided with a heat radiating portion 5. As shown in FIG. 3, the heat radiating section 5 includes a cylindrical heat radiating cylinder 51 and a disk-shaped heat radiating plate 52 provided at one end of the heat radiating cylinder 51 and having a through hole. The heat dissipation part 5 is made of metal such as aluminum and is integrally formed. The heat radiating section 5 is fixed by fitting the other end side (opening side) of the heat radiating cylinder 51 to the fixed cylinder 32 of the fixing base 3. As a result, the heat from the LEDs 2, 2... Is transmitted to the support cylinder 1 through the mounting substrates 21, 21... And further directly transmitted to the heat radiating portion 5 through the fixed base 3 by heat conduction. It is dissipated from the heat dissipating part 5 to the outside air. In addition, in this Embodiment, although the support cylinder 1, the fixing stand 3, and the thermal radiation part 5 are each comprised separately, it is not limited to this, You may integrally mold two or all.

  On the side of the heat radiating plate 52 of the heat radiating portion 5, a base 7 having a bottomed cylindrical shape is provided via an insulating ring 6. The insulating ring 6 is made of an electrically insulating material, for example, made of PBT (polybutylene terephthalate). The insulating ring 6 is in contact with the outer surface of the heat sink 52 on one surface. The base 7 is fixed to the insulating ring 6 with the edge on the opening side in contact with the other surface of the insulating ring 6. The base 7 includes a one-pole terminal 71 having a cylindrical portion that is threaded to be screwed into a socket for a light bulb, and an other-pole terminal 72 that projects from the bottom surface of the base 7. These one-pole terminals 71 and other-pole terminals 72 are insulated. The outer shape of the cylindrical portion of the base 7 is formed in the same shape as the screw-type base of E17 or E26, for example.

  In the cavity formed by the heat radiating part 5 and the base 7, an insulator 8 is provided as a hollow holding part for holding the fixed base 3. The insulator 8 includes a fixed base holding cylinder 81 that holds the fixed base, and a base holding cylinder 82 that holds the base 7. The fixed base holding cylinder 81 has a cylindrical shape. The base holding cylinder 82 has a cylindrical shape and is provided concentrically with the fixed base holding cylinder 81. The fixing base holding cylinder 81 and the base holding cylinder 82 are made of an electrically insulating material, for example, made of PBT (polybutylene terephthalate), and are integrally formed. The insulator 8 is integrated with the fixing base 3 in a state where the opening side of the fixing base holding cylinder 81 is fitted into the fixing cylinder 32 of the fixing base 3 and the base holding cylinder 82 is inserted into the base 7. It is. In the assembled state, the lighting device 100 is configured such that the connecting portion between the fixed base holding cylinder 81 and the base holding cylinder 82 abuts the inner surface of the heat radiating plate 52 of the heat radiating section 5 as shown in FIG. is there.

  With the above configuration, a cavity sealed by the translucent cover 4, the fixing base 3, and the insulator 8 is formed inside the lighting device 100. The interior of the lighting device 100 is divided into two cavities (the interior of the translucent cover 4 and the interior of the insulator 8) by the fixing base 3, and these two cavities are divided into the support cylinder 1 and the flow holes 31b, 31b..., And a cooling medium flow path for flowing the cooling medium is formed inside and outside the support tube 1 inside the lighting device 100.

  A power supply circuit unit 9 is housed inside the fixed base holding cylinder 81 of the insulator 8. The power supply circuit unit 9 is formed by mounting a plurality of circuit components on a disk-shaped circuit board. One pole terminal 71 and another pole terminal 72 of the base 7 are electrically connected to the power supply circuit portion 9 via lead wires (not shown). The power supply circuit unit 9 is electrically connected to the LEDs 2, 2... Via lead wires (not shown).

  FIG. 5 is a main part electric circuit diagram of lighting apparatus 100 according to the first embodiment. A 100 V commercial AC power supply (AC) 200 is connected to the power supply circuit unit 9 via a socket (not shown) for a light bulb and a base 7. One end of a resistor 91 constituting the power supply circuit unit 9 is connected to the base 7, and a speed-up capacitor 92 is connected to the resistor 91 in parallel. One end of a current limiting resistor 93 is connected to the other end of the resistor 91, and a diode bridge 94 for full-wave rectifying the commercial AC voltage is connected to the other end of the resistor 93. One end of a series circuit formed by connecting a plurality of LEDs 2, 2... In series is connected to the anode side of the diode bridge 94. The other end of the series circuit is connected to the cathode side of the diode bridge 94.

  The lighting device 100 configured as described above is mounted, for example, upward (the mounting direction in which the LED 2, 2... Side is upward) by screwing the base 7 with a socket for a light bulb. Connected. In this state, when the power is turned on, an alternating current is supplied to the power supply circuit unit 9 through the base 7, a direct current rectified by the diode bridge 94 is supplied to the LEDs 2, 2. Lights up.

  The heat generated in response to the lighting of the LEDs 2, 2... Is transmitted to the mounting boards 21, 21. As described above, the lighting device 100 has a sealed cavity formed by the translucent cover 4, the fixing base 3, and the insulator 8, and the inside of the translucent cover 4 and the insulator 8. Is provided with a cooling medium flow path formed by communicating the inside thereof with the support cylinder 1 and the flow holes 31b, 31b. The air that is the cooling medium warmed by the heat from the LEDs 2, 2... Circulates in this cooling medium flow path by natural convection as described below.

  FIG. 6 is an explanatory diagram of natural convection caused by heat from the LEDs 2. The lighting device 100 is mounted upward (the mounting direction in which the LED 2, 2... Are on the upper side), and the generated natural convection upward flow is indicated by a solid line and the downward flow is indicated by a broken line.

  The air in the vicinity of the LEDs 2, 2... Is warmed by the heat from the LEDs 2, 2..., As shown in the figure, on one surface 21 a, 21 a. As a result, an upward flow that flows upward along the inner surface 1b of the support cylinder 1 is generated, and an upward flow that flows upward along the inner surface 1b of the support cylinder 1 is generated. In this way, the air inside the translucent cover 4 is warmed by the transmitted heat and flows upward along the inside and outside of the support cylinder 1, while the interior of the insulator 8 mainly from below the support cylinder 1. Inflow of air.

  On the other hand, the air rising along the inner side and the outer side of the support cylinder 1 reaches the translucent cover 4, and heat exchange with the external air is performed through the translucent cover 4. As a result, the cooled air becomes a downward flow that flows downward along the inner surface of the translucent cover 4. Then, the air that has moved downward along the inner surface of the translucent cover 4 passes through the flow holes 31 b, 31 b... Provided in the support cylinder fixing plate 31 of the fixing base 3 and flows into the insulator 8. To do. As a result, the air circulates in the sealed cooling medium flow path formed by the translucent cover 4, the fixing base 3, and the insulator 8 so as to flow along the inside and outside of the support cylinder 1. Become.

  About the heat dissipation characteristic of the illuminating device 100 which concerns on Embodiment 1, it confirmed by simulation and the following results were obtained. In the case of an illuminating device having the same basic configuration as the illuminating device 100 according to the first embodiment and having no support holes 31b, 31b... In the support cylinder fixing plate 31 of the fixing base 3, the temperature of the LED 2 is 140. 9 (° C.). Further, the basic configuration is the same as that of the lighting device 100 according to the first embodiment, the support cylinder fixing plate 31 of the fixing base 3 does not have the flow holes 31b, 31b, and both ends of the support cylinder 1 are closed. In the case of the illumination device having the configuration, the temperature of the LED 2 was 139.0 (° C.). And in the case of the illuminating device 100 which concerns on Embodiment 1, the temperature of LED2 was 131.9 (degreeC). As can be seen from this result, by circulating the air as the cooling medium in the cooling medium flow path so as to flow along the inside and outside of the supporting cylinder 1 by natural convection, in other words, the supporting cylinder 1 from both sides. The mounting boards 21, 21... Can be cooled from both sides, and the heat from the LEDs 2, 2... Provided on the support cylinder 1 via the mounting boards 21, 21. Can be improved. In this simulation, the lighting device is mounted upward (the mounting direction in which the LEDs 2, 2... Are upward), the amount of heat generated per LED 2 is 0.22 (W / piece), and the ambient temperature is 25 ° C. It carried out on condition that it is.

  In the lighting device 100 according to the first embodiment, the inside of the translucent cover 4 that houses the LEDs 2, 2... As light sources that are heat-generating components, and the hollow holding whose temperature is lower than that of the translucent cover 4. The air as the cooling medium can be circulated so as to flow along the inside and outside of the support cylinder 1 through the inside of the cooling medium flow path by natural convection between the inside of the insulator 8 as a part, The heat from 2 ... is transmitted from the air as the cooling medium to the translucent cover 4, and is dissipated to the outside air. As a result, the support tube 1 can be cooled from both the inside and the outside, in other words, the mounting substrates 21, 21... Can be cooled from both sides, and the heat from the LEDs 2, 2. Can be improved. Moreover, since the inner side and the outer side of the support cylinder 1 can be cooled in the same manner, generation of a temperature gradient can be suppressed. As described above, the temperature rise of the LEDs 2, 2... Can be suppressed, the luminous efficiency can be increased, and the life characteristics of the LEDs 2, 2. Moreover, the heat from the power supply circuit unit 9 accommodated in the insulator 8 can be dissipated to the outside air, and the performance of the electronic components constituting the power supply circuit unit 9 can be ensured.

  Moreover, in the illuminating device 100 which concerns on Embodiment 1, since the thermal radiation part 5 was connected with the fixing base 3 as mentioned above, the heat | fever from LED2,2, ... Then, it is transmitted to the support cylinder 1 through the fixed base 3 and directly transmitted to the heat radiating portion 5 through the fixed base 3 by heat conduction, and is dissipated from the heat radiating portion 5 to the outside air. In addition to this, as described above, since the air circulated inside the lighting device 100 by natural convection is dissipated to the outside air, the heat dissipation can be further improved.

  Since the support cylinder 1 having a rectangular tube shape is provided substantially concentrically inside the translucent cover 4 having a bottomed cylindrical shape, the area through which the air passes covers substantially the entire length in the longitudinal direction of the support cylinder 1. Therefore, natural convection can be generated so that air smoothly circulates inside and outside the support cylinder 1, and heat dissipation can be further improved.

  Since an LED is used as a light source and the LED is small and has a high degree of freedom in arrangement design, the heat generated by the LED can be efficiently arranged inside and outside the support cylinder 1 by appropriately arranging the LED on the support cylinder 1. Can be transmitted to the flowing air and dissipated to the outside air.

  Moreover, in the illuminating device 100 which concerns on Embodiment 1, it is comprised so that the heat from LED2,2, ... may be dissipated with the air which circulates through the inside of the sealed cooling medium flow path of the illuminating device 100 by natural convection. Therefore, it is possible to prevent dust, dust, etc. from entering the inside of the lighting device 100 from the outside and coming into contact with the power supply circuit unit 9 to cause ignition or failure, and safety and easy maintenance of the lighting device 100 can be prevented. This is preferable.

(Embodiment 2)
FIG. 7 is a schematic external perspective view of lighting apparatus 110 according to Embodiment 2 of the present invention. FIG. 8 is a schematic exploded perspective view of the illumination device 110. FIG. 9 is a schematic cross-sectional view of the lighting device 110. The illuminating device 110 according to Embodiment 2 has a fixed base 103 provided with a flow hole different from that of the illuminating device 100 according to Embodiment 1.

  The fixing base 103 for fixing the supporting cylinder 1 includes a disk-shaped supporting cylinder fixing plate 131 and a cylindrical fixing cylinder 132 which is erected on the periphery of the supporting cylinder fixing plate 131 and to which the heat radiation part 5 is fixed. It has a flat bottomed cylindrical shape. In the approximate center of the support cylinder fixing plate 131, a rectangular shape is formed, and a fixing hole 131a to which the support cylinder 1 is fixed is provided.

  Further, in the support cylinder fixing plate 131, in order to allow the cooling medium to pass therethrough, a plurality of circulation holes 131b, 131b,... Having a substantially quadrant shape are aligned with the corners of the fixing hole 131a in the circumferential direction. Evenly distributed. As a result, in the assembled state, as shown in FIG. 9, the mounting substrates 21, 21... On which the LEDs 2, 2. In the present embodiment as well, the flow holes 131b, 131b,... Provided in the illumination device 110 that is mounted upward (the mounting direction in which the LEDs 2, 2,. Since the other configuration is the same as that of the first embodiment shown in FIGS. 1 to 6, the same reference numerals are assigned to the corresponding structural members, and detailed description of the configuration is omitted.

  The heat dissipation characteristics of lighting apparatus 110 according to Embodiment 2 were confirmed by simulation, and the following results were obtained. In the case of an illuminating device having the same basic configuration as that of the illuminating device 110 according to the second embodiment and having no support holes 131b, 131b, etc. in the support tube fixing plate 131 of the fixing base 103, the temperature of the LED 2 is 100. 8 (° C.). Further, the basic configuration is the same as that of the illumination device 110 according to the second embodiment, the support cylinder fixing plate 131 of the fixing base 103 does not have the flow holes 131b, 131b, and both ends of the support cylinder 1 are closed. In the case of the illumination device having the configuration, the temperature of the LED 2 was 99.4 (° C.). And in the case of the illuminating device 110 which concerns on Embodiment 2, the temperature of LED2 was 98.0 (degreeC). As can be seen from this result, by circulating the air as the cooling medium in the cooling medium flow path so as to flow along the inside and outside of the supporting cylinder 1 by natural convection, in other words, the supporting cylinder 1 from both sides. The mounting boards 21, 21... Can be cooled from both sides, and the heat from the LEDs 2, 2... Provided on the support cylinder 1 via the mounting boards 21, 21. Can be improved. In this simulation, the lighting device is mounted upward (the mounting direction in which the LEDs 2, 2,... Are on the upper side), the amount of heat generated per LED 2 is 0.145 (W / piece), and the ambient temperature is 25 ° C. It carried out on condition that it is.

  Also in the illumination device 110 according to the second embodiment, as in the illumination device 100 according to the first embodiment, the inside of the translucent cover 4 that houses the LEDs 2, 2,... Cooling is performed so that the inside of the cooling medium flow path flows along the inside and outside of the support cylinder 1 by natural convection with the inside of the insulator 8 which is a hollow holding portion whose temperature is lower than that of the translucent cover 4. The air as the medium can be circulated, and the heat from the LEDs 2, 2... Is transmitted from the air as the cooling medium to the translucent cover 4 and dissipated to the outside air. As a result, the support tube 1 can be cooled from both the inside and the outside, in other words, the mounting substrates 21, 21... Can be cooled from both sides, and the heat from the LEDs 2, 2. Can be improved. Moreover, since the inner side and the outer side of the support cylinder 1 can be cooled in the same manner, generation of a temperature gradient can be suppressed. As described above, the temperature rise of the LEDs 2, 2... Can be suppressed, the luminous efficiency can be increased, and the life characteristics of the LEDs 2, 2. Moreover, the heat from the power supply circuit unit 9 accommodated in the insulator 8 can be dissipated to the outside air, and the performance of the electronic components constituting the power supply circuit unit 9 can be ensured.

  In the above embodiment, the support cylinder 1 has a quadrangular cylindrical shape, but the shape of the support cylinder is not limited to this, and may be a cylindrical body. Moreover, in the above embodiment, although the translucent cover 4 has a bottomed cylindrical shape, the shape of the translucent cover is not limited to this, and is a shape that can accommodate the support cylinder 1. For example, a hollow sphere shape may be used. However, it is desirable that the change in the area along the longitudinal direction of the support tube of the translucent cover is gradual.

  Moreover, the flow hole shown in the above embodiment is an example, and is not limited to this. The flow hole may be appropriately provided so that the upward flow is generated along the inner side and the outer side of the support tube and the downward flow is generated along the inner side of the translucent cover. In the illuminating device of the above embodiment, the flow hole is provided in the support cylinder fixing plate of the fixed base, but may be provided below the support cylinder 1 (but above the support cylinder fixing plate). Even in the case, it contributes to the improvement of heat dissipation.

  Further, in the above embodiment, the insulator 8 is configured to function as a hollow holding portion that holds the fixing base. However, the present invention is not limited thereto, and the heat radiating portion 5 functions as a hollow holding portion. The fixing base and the hollow holding portion may be provided integrally.

  In the above embodiment, air circulates in a sealed cooling medium flow path inside the lighting device, but the cooling medium is not limited to air.

  Further, in the above embodiment, the surface mount type LED is used as the light source. However, the present invention is not limited to this, and other types of LEDs, EL (Electro Luminescence), and the like may be used.

  In the above embodiment, the lighting device attached to the socket for the light bulb has been described as an example. However, the heat dissipation mechanism described above is not limited to such a lighting device, but other types of lighting devices and lighting devices. Needless to say, the present invention can be applied to a device including the heating element, and can be implemented in variously modified forms within the scope of the matters described in the claims.

It is a typical external appearance perspective view of the illuminating device which concerns on Embodiment 1 of this invention. It is a typical exploded perspective view of an illuminating device. It is a typical longitudinal cross-sectional view of an illuminating device. It is typical sectional drawing by the IV-IV line of FIG. FIG. 3 is a main part electric circuit diagram of the lighting apparatus according to Embodiment 1; It is explanatory drawing of the natural convection which arises with the heat | fever from LED. It is a typical external appearance perspective view of the illuminating device which concerns on Embodiment 2 of this invention. It is a typical exploded perspective view of an illuminating device. It is a typical cross-sectional view of an illuminating device.

Explanation of symbols

1 Support tube 2 LED (light source)
3,103 fixed base (fixed part)
31b, 131b Flow hole 4 Translucent cover (translucent container)
5 Heat dissipation part 8 Insulator (hollow holding part)

Claims (6)

  In a lighting device including a light source and a light-transmitting container that houses the light source and transmits light from the light source, a support cylinder that supports the light source, and a cooling medium inside and outside the support cylinder And a cooling medium flow path for causing the liquid to flow.   The lighting device according to claim 1, further comprising: a fixing portion that fixes the support cylinder, wherein the fixing portion is provided with a flow hole through which the cooling medium passes.   A hollow holding part that holds the fixing part and has a cavity therein is provided, and the inside of the translucent container and the hollow holding part are communicated with each other by the support cylinder and the flow hole. Item 3. The lighting device according to Item 2.   The lighting device according to claim 2, further comprising a heat dissipating unit that is connected to the fixing unit and dissipates heat from the light source.   5. The light-transmitting container has a bottomed cylindrical shape, and the light-transmitting container and the support tube are disposed substantially concentrically. Lighting device.   The lighting device according to claim 1, wherein the light source is an LED.

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