JPWO2015020230A1 - Lighting device - Google Patents

Abstract

[Problem] To provide a lighting device capable of improving the efficiency of the apparatus and improving the heat dissipation. [Solution] The lighting device according to the present embodiment has a glove having an opening at one end and a hollow inside, a base housed in the glove, and at least one housed in the glove and disposed on the base. A light source having two LEDs, a light guide member that is housed in the globe and covers a light emitting surface of the light source, and has a light transmission property; and the light source and the light guide member that are housed in the globe and the base. A support column provided on the opposite side to support the base, a radiation layer provided on the surface of the support column for radiating heat, a globe connector connected to the support column at the one end of the globe, and the globe connector A base connector to be connected; a base connected to the base connector for supplying power to the light source; and an arrangement for electrically connecting the base and the light source. And, equipped with a.

Description

  Embodiments described herein relate generally to a lighting device.

  In general, an illuminating device using an LED (Light-Emitting Diode) arranges an LED that generates light on one surface of a base, and provides a spherical globe so as to cover the LED so that light from the LED is emitted. Diffusing and emanating outside. In such an illuminating device, heat from the LED is transferred to the base and radiated from the other surface (heat radiating surface) of the base in contact with the outside air to the outside.

  In an illuminating device using an LED, a illuminating device using an ordinary filament or the like, for example, a light distribution angle comparable to that of an incandescent light bulb, that is, a scale indicating the extent of the light emitted by the LED, and the total luminous flux, that is, the light emitted from the LED. There is a need for a scale that indicates the degree of brightness, a scale that indicates transparency, that is, a ratio of the surface that transmits light of the lighting device, and a realization of the position of a light source such as an incandescent bulb. The incandescent bulb emits light from the center of the globe where the filament is located, and the position of the light source is the center of the globe.

  In an illumination device using an LED, in order to increase the light distribution angle, the area of the outer surface of the globe where light is finally emitted is increased, and the light irradiated forward from the light emitting surface of the LED is It is necessary to control the light distribution so that the light is emitted in all directions as much as possible.

  Further, in order to increase the total luminous flux, it is necessary to use a higher-power LED, so that the amount of heat generated from the LED increases. The heat generated by the LED affects the LED element itself and a circuit board such as a power supply circuit, and the performance of the LED element and the circuit board is deteriorated. For this reason, in order to improve the heat dissipation performance of the lighting device, it is necessary to increase the area of the heat dissipation surface of the base.

  In order to improve the transparency, it is necessary to increase the proportion of the globe surface on the outer surface of the lighting device and reduce the surface area of the opaque member disposed inside the globe. In order to arrange the light source at the center of the globe, it is necessary to effectively transfer heat generated from the light source to the globe and the base, and to prevent the light from the center of the globe from being blocked by the opaque member.

JP 2012-212682 A

  The present embodiment provides an illumination device that can increase the total luminous flux and expand the light distribution angle.

  The lighting device according to the present embodiment includes a globe having an opening at one end and a hollow inside, a base housed in the globe, and at least one LED housed in the globe and disposed on the base. A light source, a light guide member that is housed in the globe and covers a light emitting surface of the light source, and has light permeability; and a light guide member that is housed in the globe and opposite to the light source and the light guide member. A support provided to support the base, a radiation layer provided on the surface of the support for radiating heat, a globe connector connected to the support at the one end of the globe, and a base connected to the globe connector A connector; a base connected to the base connector for supplying power to the light source; and a wiring for electrically connecting the base and the light source. .

Drawing 1 (a) and 1 (b) are figures showing an illuminating device by a 1st embodiment. The figure which shows the lens of the illuminating device by 1st Embodiment. The figure which shows the support | pillar of the illuminating device by 1st Embodiment. The figure explaining the convection in the glove of the illuminating device by 1st Embodiment. The figure explaining the conditions which obtain the wide light distribution in the illuminating device by 1st Embodiment. Sectional drawing which shows the illuminating device by the modification of 1st Embodiment. Sectional drawing which shows the illuminating device by 2nd Embodiment. Sectional drawing which shows the illuminating device by 3rd Embodiment. Sectional drawing which shows the illuminating device by 4th Embodiment. FIGS. 10A and 10B are views showing an illumination device according to the fifth embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
1 (a) and 1 (b) show an illumination device 100 according to the first embodiment. 1A is an external view of the lighting device 100, and FIG. 1B is a cross-sectional view of the lighting device 100 cut along the line AA in FIG. 1A.

  In the present embodiment, the lighting device 100 will be described with respect to an example in which the lighting device 100 is attached to a socket provided on an indoor ceiling or the like, but the present invention is not limited to this. The lighting device 100 according to the first embodiment includes a globe 10 and a base 60. The globe 10 emits light emitted from a light source described later contained in the globe 10 from the surface to the outside. The base 60 serves as an electrical and mechanical connection portion when the lighting device 100 is fixed to a socket (not shown) by, for example, screwing or the like. In the present embodiment, the lighting device 100 has a substantially symmetrical shape about the axis, that is, the AA line. Hereinafter, this axis is referred to as the central axis of the illumination device 100.

  As shown in FIG. 1A, in a state where the central axis of the lighting device 100 is aligned with the direction of gravity and the socket 100 is mounted on the socket, the base 60 is positioned on the upper side and the globe 10 is positioned on the lower side. To do. When power is supplied to a socket (not shown) by an indoor power supply or the like, light is emitted from a light source provided in the globe 10 and emitted to the outside through the surface of the globe 10, and the lighting device 100 functions as illumination.

  The globe 10 has an opening at one end, and this opening has a diameter corresponding to the diameter of the opening of the base 60. The glove 10 has a hollow inside, and the circumference of the glove 10 in a cross section perpendicular to the central axis of the glove 10 gradually increases as the glove 10 moves downward from the opening along the central axis. After the circumference reaches the maximum value, the shape gradually decreases.

  Furthermore, as shown in FIG. 1B, the illumination device 100 according to the present embodiment includes a plate-like base 20 provided inside the globe 10, a substrate 41 disposed on the base 20, and a substrate 41. The light source 40 provided above, the wiring 90 electrically connected to the light source 40, the light-transmitting lens (light guide member) 30 disposed on the light emitting surface side of the light source 40, and the base 20 The lens connector 50 that fixes the lens 30, the column 21 that supports the base 20, the radiation layer 80 that is provided on the surface of the column 21, and the globe connector 22 that is connected to the column 21 and supports the globe 10. And a base connector 23 for connecting the globe connector 22 to the base 60.

  The base 20 is a member having a flat plate shape on which the substrate 41 is disposed, and conducts heat generated by the light source 40 inside and transmits the heat to the column 21. Hereinafter, the light source 40 side of the base 20 is defined as the lower surface, and the surface opposite to the lower surface is defined as the upper surface. For example, the base 20 may have a substantially disk shape as shown in FIG. A part of the base 20 is provided with a screw hole, threading, or hole for connection to the lens connector 50 and the column 21. Further, the base 20 is provided with a through hole for passing the wiring 90 from the upper surface to the lower surface. Instead of providing a through hole in the base 20, a hole may be provided in the side surface of the support column 21 so that the wiring 90 reaches the substrate 41 side of the base 20. In addition, as a material of the base 20, the material excellent in heat conductivity, such as an aluminum alloy and a copper alloy, for example is used.

  The column 21 is a member having a cavity inside, and conducts heat generated by the light source 40 inside and transmits part of the heat to the globe 10 and the base 60. The support column 21 has a curved substantially cylindrical shape as shown in FIG. As a material of the support | pillar 21, the material excellent in heat conductivity, such as an aluminum alloy and a copper alloy, for example is used. The circumferential length of the column 21 in a cross section perpendicular to the central axis of the column 21 changes as it reaches the base 60 side, and the circumferential length is equal to or less than the circumferential length of the base 20. Here, the perimeter means the perimeter of the outer periphery.

  Moreover, although the inside of the support | pillar 21 is filled with air, you may accelerate | stimulate heat transfer by enclosing refrigerant | coolants, such as water and a fluorocarbon, and making it operate | move as a heat pipe. A heat pipe may be inserted. On the surface of the support column 21, a radiation layer 80 having a high heat radiation property such as alumite formed by surface treatment or painting is provided. If a material having a low visible light absorptivity such as white paint is used for the radiation layer 80, the light loss on the surface of the support column 21 can be reduced. Hereinafter, the hollow side surface of the support column 21 is referred to as an inner surface, and the surface opposite to the inner surface is referred to as an outer surface (surface).

  By providing the column 21, the ratio of the surface of the globe 10 to the outer surface of the lighting device 100 can be increased while the light source 40 is disposed at the center of the globe, and the surface area of the opaque member disposed inside the globe 10 is reduced. The transparency of the lighting device 100 is improved.

  The globe connector 22 is a member that connects the support column 21, the globe 10, and the base connector 23. Part of the heat generated by the light source 40 is transmitted to the globe connector 22 via the support column 21 and is transmitted to the globe 10. The globe connector 22 has a substantially cylindrical shape as shown in FIG. The globe connector 22 is provided with a screw hole or the like that is integral with either the support 21 or the base connector 23 or connected to the support 21 or the base connector 23. Further, a convex portion or a groove for increasing the contact area with the globe 10 is provided. For the globe connector 22, a material having excellent thermal conductivity such as an aluminum alloy or a copper alloy is used. For connection with the globe 10, for example, an adhesive having heat resistance is used. Note that the surface of the globe connector 22 that comes into contact with air may be provided with a radiation layer having high heat radiation properties, such as anodized by surface treatment or coating. If a material with low visible light absorption such as white paint is used for the radiation layer, the loss of light on the surface of the globe connector 22 can be reduced.

  The base connector 23 is a member that can be screwed into the base 60, and conducts heat generated by the light source 40 inside and transmits the heat to the base 60. The base connector 23 has a cylindrical shape as shown in FIG. 1B, for example, and has openings at both ends. A part of the base connector 23 is provided with a screw hole, a thread, or a hole for connection to the globe connector 22 and the base 60. As a material of the base connector 23, for example, a material having excellent thermal conductivity such as an aluminum alloy, a copper alloy, ceramics, or a resin is used. In the following, the surface of the base connector 23 on the globe connector 22 side is defined as the bottom surface, and the surface screwed with the base 60 is defined as the side surface.

  In this way, by radiating heat to the base 60 by the base connector 21, the ratio of the surface of the globe 10 to the outer surface of the lighting device 100 can be increased, and the opaque member disposed inside the globe 10 can be increased. The surface area can be reduced, and the transparency of the lighting device 100 is improved.

  The lens connector 50 is a member for fixing the lens 30 to the substrate 41. The lens connector 50 has a substantially disk shape, for example, as shown in FIG. Further, a convex portion for pressing the substrate 41 against the base 20 may be provided in a part of the lens connector 50. This convex part is provided avoiding the light emitting surface of the light source 40 and an electrode part (not shown) on the substrate 41. The lens connector 50 may be provided with a screw hole, threading, or a hole for connection to the base 20. In addition, as a material of the lens connector 50, for example, a synthetic resin excellent in strength and heat resistance, such as polycarbonate, or a metal such as an aluminum alloy or a copper alloy is used. For connection with the lens 30, for example, an adhesive having heat resistance is used.

  The lens connector 50 serves as a spacer around the substrate 41 and the light source 40 when the lens 30 is fixed. Further, when the lens 30 is made of resin and the base 20 is made of metal, the resin-type lens connector 50 is fixed to the base 20 with a screw, and the lens 30 and the lens connector 50 are bonded together with an adhesive. Since the gaps are bonded and the dissimilar materials are screwed, reliable bonding is possible. It is also possible to provide a screw hole directly in the lens 30 and screw it into the base 20 with a screw. However, in this case, light is reflected or absorbed by the screw holes and the screws, and the light distribution control by the lens 30 becomes difficult. In this way, by using the lens connector 50, it is possible to realize reliable fixing and easy light distribution control. Hereinafter, the surface on the light source 40 side of the lens connector 50 is defined as the lower surface, and the surface opposite to the lower surface is defined as the upper surface.

  The lens 30 is a member that transmits light, such as glass or synthetic resin, and reflects, refracts, and diffuses light on each surface. Alternatively, particles that scatter light such as a scatterer may be sealed inside the lens 30 to have a diffusion function. A cross-sectional view of a specific example of the lens 30 is shown in FIG. The lens 30 has a diffusion part 30a, a total reflection part 30b, and a central part 30c. The entire surface of the diffusion portion 30a is a diffusion surface. This diffusion surface is created by, for example, sandblasting. However, it is not limited to sand blasting, and may be formed using white coating or the like. The diffusing portion 30a includes a cylindrical first portion 30a1 and a second portion 30a2 connected to the first portion 30a1 through a joint surface. The total reflection part 30b is covered with the diffusion part 30a, and the entire surface is mirror-finished. The central part 30c is provided at the center of the total reflection part 30b, and extends from the light source 40 side to the diffusion part 30a along the central axis. The light incident on the central portion 30c from the light source 40 goes straight as it is and is emitted to the outside through the diffusion portion 30a.

  Further, the second portion 30a2 of the diffusing portion 30a has a hemispherical outer surface centered on the center point O on the joint surface. This outer surface is similar to the inner shape of the globe 10. That is, the distance between the inner surface of the globe 10 and the outer surface of the diffusing portion 30a is substantially constant. The center point O is provided so as to coincide with the center of the globe 10. Thereby, the light from the light source 40 is emitted from the center point O, that is, the center of the globe. The maximum diameters of the diffusing unit 30a and the total reflection unit 30b are equal to or smaller than the diameter of the opening of the globe 10. Thereby, the lens 30 can be inserted into the globe 10. As a material of the lens 30, it is preferable to use acrylic, polycarbonate, cycloolefin polymer, glass or the like having high light transmittance.

  The light source 40 is a component on which one or more light emitting elements (not shown) such as LEDs are mounted on one surface of a plate-like substrate 41, and generates visible light such as white light. As an example, when a light-emitting element that generates blue-violet light having a wavelength of 450 nm is used, the light-emitting element is covered with a resin material containing a phosphor that absorbs blue-violet light and generates yellow light having a wavelength of about 560 nm. The light source 40 generates white light.

  In the case where the substrate 41 is made of a material having high electrical conductivity such as metal, a surface opposite to the surface on which the light source 40 is provided is a sheet (not shown) having electrical insulation and excellent thermal conductivity. It is preferably provided on the surface of the base 20 so as to be in contact with each other. As will be described later, in order to transmit the heat generated by the light source 40 to the base 20, it is preferable that the contact thermal resistance between the light source 40 and the base 20 is small, and the light source 40 and the base 20 are electrically connected to each other. This is because it is preferable to have an insulating relationship. In addition, when the board | substrate 41 is a raw material with low electrical conductivity, such as ceramics, the said insulating sheet is not necessarily required.

  In addition, as shown by the flow line 71 of FIG. 4 mentioned later, the density of the air near the support | pillar 21 becomes low density by the heat radiation from the support | pillar 21, and flows in the direction opposite to the direction of gravity. Moreover, the air in the vicinity of the globe 10 is absorbed by the low-temperature globe 10, increases in density, and flows in the forward direction (the same direction) with respect to gravity. The light source 40 can be efficiently cooled by a cycle of heat radiation from the support column 21 and heat radiation to the globe 10 by the circulation flow.

  In this way, by radiating heat from the support column 21 to the globe 10 in a non-contact manner by convection, the ratio of the surface of the globe 10 to the outer surface of the lighting device 100 can be increased, and the surface of the globe 10 is arranged inside the globe 10. The surface area of the opaque member can be reduced, and the transparency of the lighting device 100 is improved.

  A power supply circuit (not shown) that supplies power to the light source 40 may be provided inside the base 60, the base connector 23, and the support column 21. The power supply circuit receives an AC voltage (for example, 100 V) and converts it to a DC voltage, and then applies the DC voltage to the light source 40 through the wiring 90. In that case, electric power can be supplied to the light source 40 without using an external power source.

(Description of function)
Hereinafter, the function of the illumination device 100 will be described in detail with reference to FIGS.

  FIG. 3 is a diagram for explaining the shape of the column 21. FIG. 4 is a diagram for explaining natural convection in the globe.

  When power is supplied to the socket by an indoor power source or the like in a state where the base 60 of the lighting device 100 is mounted on a socket provided on the ceiling or the lamp of the room, any of the base 60, the base connector 23, and the column 21 A constant current is supplied to the light source 40 via a power supply circuit (not shown) included in the crab or an external power supply. Thereby, the light source 40 emits light.

  The function of the lens 30 will be described with reference to FIG. The main component of the light emitted from the light source 40 is totally reflected by the upper surface (recessed surface) of the total reflection part 30b, and is emitted once from the cylindrical side surface of the total reflection part 30b. Further, the light enters the diffusion portion 30a, and is diffused and transmitted through the diffusion portion 30a. Thereby, light is emitted in the lateral direction and obliquely upward in FIG. 2 from the rear side, that is, the emission direction of the light source 40.

  Further, the light that has not been totally reflected by the upper surface of the reflecting portion 30b, that is, the recessed surface, is transmitted from the upper surface of the reflecting portion 30b. Further, the light enters the diffusion portion 30a and is diffused and transmitted through the diffusion portion 30a. Thereby, light is emitted toward the front side, that is, the light source 40 emission direction.

  As described above, the light emitted from the light source 40 is finally distributed more widely than the diffusion unit 30a and diffused and transmitted with a uniform light distribution.

  Further, since the diffusing portion 30a has an outer surface in which the inner surface shape of the globe 10 is similar, the distance between the outer surface and the globe 10 is substantially the same. Thereby, the light distribution characteristic of the light emitted from the surface of the diffusion portion 30 a is projected onto the globe 10. That is, if the light distribution is uniform, there is an effect that the globe 10 appears to shine uniformly.

  The maximum diameter of the diffusing portion 30a and the total reflection portion 30b is equal to or smaller than the diameter of the opening of the globe 10. Thereby, the lenses 30a and 30b can be inserted into the globe 10. On the other hand, when the maximum diameter of the lenses 30a and 30b is equal to or larger than the diameter of the opening of the globe 10, processing such as dividing the globe 10 is required. This has the effect of reducing the processing process load.

  The light source 40 generates heat as it emits light. This heat is transmitted from the light source 40 to the substrate 41. Subsequently, the inside of the substrate 41 is transferred to the base 20. The heat transmitted to the base is transmitted to the support 21 through the base 20. A part of the heat transferred to the column 21 is transferred to the globe 10 by convection from the surface of the column 21 and heat radiation, and the other part is transferred to the globe connector 22 by heat conduction. A part of the heat transmitted to the globe connector 22 is transmitted to the globe 10, and the other part is transmitted to the base connector 23. The heat transmitted to the base connector 23 is transmitted to the base 60 through the base connector 23. At this time, as described above, between the substrate 41 and the base 20, between the base 20 and the support 21, between the support 21 and the globe connector 22, between the globe connector 22 and the globe 10, and between the globe connector 22 and the base connector 23. And the base connector 23 and the base 60 are thermally connected to each other by screwing such as grease, a sheet, a tape, etc., which are excellent in thermal conductivity, and screws, and efficiently transfer heat. be able to.

  A radiation layer 80 is provided on the surface of the support column 21 in order to promote heat dissipation by radiation from the support column 21 to the globe 10. The radiation layer 80 is formed by alumite formed by surface treatment or painting. If a material having a low visible light absorptivity such as white paint is used for the radiation layer 80, the loss of light on the column surface can be reduced.

  In this way, by radiating heat from the support column 21 to the globe 10 in a non-contact manner by the radiation layer 80, the ratio of the surface of the globe 10 to the outer surface of the lighting device 100 lighting device can be increased, and the inside of the globe 10 can be increased. The surface area of the opaque member to be arranged can be reduced, and the transparency of the lighting device 100 is improved.

  In addition, when the mirror surface process by grinding | polishing or metal vapor deposition is given, although the heat radiation by radiation is not accelerated | stimulated, the loss of light on the support | pillar surface can be made small like white coating.

  The end of the globe connector 22 is provided with a projection or groove for increasing the connection surface with the globe 10. The globe connector 22 and the globe 10 are fixed with an adhesive having high heat resistance.

  In order to promote heat radiation from the globe connector 22 to the environment, a radiation layer may be provided on the surface of the globe connector 22 that contacts the air. The radiation layer is formed by alumite formed by surface treatment or painting. If a material with low visible light absorption such as white paint is used for the radiation layer, the loss of light on the surface of the globe connector can be reduced.

The surfaces of the column 21 and the globe 10 are flat, the surface area of the column 21 is A _i , the length of the column 21 is l _g , the radius when the column 21 is approximated to a sphere with an equivalent surface area is r _i , and the light source 40 The surface area A _i satisfies the following formula (1), where r _i is the r _imin when the junction is at the heat resistant temperature.
4πr _imin ² ≦ A _i (1)
Here, if the thermal resistance of the entire lighting device 100 is R _bulb (r _i ), the heat generation amount of the light source 40 is Q _l , and the heat resistant temperature rise of the junction of the light source 40 is ΔT _jmax , r _imin is _expressed by the following equation (2). Meet.
ΔT _jmax = R _bulb (r _imin ) Q _l (2)
Here, the thermal resistance from the junction of the light source 40 to the environment via the base 60 is R _lc , the thermal resistance from the surface in contact with the outside of the globe connector 22 to the environment is R _gc , and the junction of the light source 40 to the surface of the column 21 the thermal resistance _{R lp,} the thermal resistance _{R ga} from the surface to the environment of the glove 10, the thermal resistance due to convection and radiation between the strut 21 and the globe 10 and _R a _{(r i),} R containing _{r i bulb} ( _rimin ) satisfies the following expression (3).

Here, if the thermal resistance due to convection between the support column 21 and the globe 10 is R _c (r _i ), and the thermal resistance due to radiation between the support column 21 and the globe 10 is R _r (r _i ), then r _i is Including R _a (r _i ) satisfies the following expression (4).

Here, when the average temperature of the surface of the support column 21 is T _i , the average temperature of the inner surface of the globe is T _o , and the equivalent radius when the globe 10 is approximated to a sphere is r _o , R _c including r _i (r _i ) satisfies the following equation (5).

Here, the average emissivity of the support 21 surface epsilon _i, the average emissivity epsilon _o of the glove inner surface, and the time, _R r _{(r i)} containing _{r i} satisfies the following equation (6).

On the other hand, in order to promote heat dissipation to the globe 10 by convection from the support column 21, it is necessary to appropriately secure the interval between the support column 21 and the globe 10 as shown in FIG. In the central axis 201 perpendicular to the plane of the illumination device 100, the distance from the surface of the strut 21 to the inner surface of the globe 10, the average distance obtained by integrating along the central axis from the upper end of the strut to the bottom and d _n , Where the length of the column 21 is l _g , the volume expansion coefficient is β, the surface temperature of the column 21 is T _i , the average temperature of the inner surface of the globe 10 facing the column 21 is T _g , and the kinematic viscosity coefficient is v _n Is represented by the following equation (7).

Further, Grashof number Gr _l here is expressed by the following equation (8).

When the distance between the support column 21 and the globe 10 is _{equal to} or greater than dn represented by the equation (7), heat transfer by gas becomes dominant, and heat transfer is performed while securing the interval between the globe 10 and the support column 21. Heat can be promoted, and the transparency of the lighting device 100 is improved.

The relationship between the surface area A _i of the column 21 is expressed by the following equation (9).
A _i ≦ 2πd _n l _g (9)
In the present embodiment, the globe 10 has been described as an example of a configuration that covers substantially the entire surface of the lighting device 100 other than the base 60. However, even when the globe 10 is configured to cover only a part using a metal casing. Good. In this case, in addition to heat radiation from the surface of the globe 10, heat can be directly radiated from the surface of a metal housing (not shown).

  The heat exhausted from the support column 21 warms the air inside the globe, and as shown by the streamline 71 in FIG. 4, the warmed air is naturally convected along the surface of the support column 21 in the opposite direction of gravity. To rise. The air reaching the upper end of the support column 21 is gradually cooled on the inner surface of the globe 10 and descends in the direction of gravity. Due to the air flow, heat transfer from the support column 21 to the globe 10 is promoted, and the lighting device 100 is further cooled. At this time, the temperature of the flowing air gradually increases as the air flows upward along the periphery of the support column 21. That is, in the vicinity of the surface of the support column 21, the temperature of the air near the lower end of the support column 21 is the lowest, and the temperature of the air increases as it approaches the upper end. By providing the light source 40 at the lower end of the column 21 as in the present embodiment, the light source 40 can be efficiently cooled by cooler air. By radiating heat from the support column 21 to the globe 10 in a non-contact manner by convection, the ratio of the surface of the globe 10 to the outer surface of the lighting device 100 can be increased, and the opaque member disposed inside the globe 10 can be increased. The surface area can be reduced, and the transparency of the lighting device 100 is improved.

Next, conditions for obtaining a wider light distribution will be described with reference to FIG. The light emitted from the light source 40 is emitted around the illumination device 100 through the lens (light guide member) 30. At this time, the origin of the light distribution angle of the light from the lens 30 is O. Further, representing the half of the light distribution angle of light emitted from the origin O of the lens 30 at an angle theta _d. In a plane perpendicular to the central axis 201 of the lighting device that passes vertically through the origin O of the lens 30 and extends from the central axis 201, the base connector 201, the glove connector 22, the support column 21, the base 20, the lens connector 50, the base 60, and , the distance to the end of each of the other optically opaque parts of the r _m, from a plane perpendicular to the origin O of the lens 30 as the central axis 201, the distance to the end and l _m, the light source When the minimum distance from the central axis 201 of the surface facing the 40 lens 30 is r _l , the distance r _m is preferably in the range shown in the following equation (10).

r _l ≦ r _m ≦ l _m | tan θ _d | (10)
The distance r _{l of} the surface of the light source 40 facing the lens 30 means the minimum distance from the origin of the surface, which is the intersection of the central axis and the surface, to the outer periphery of the surface. The distance from the plane passing through the origin O of the lens 30 and orthogonal to the central axis 201 to the end means the minimum value of the distance from the end to each point on the plane. In FIG. 5, the origin O of the light distribution angle is arranged in the vicinity of the center of the lens on the central axis, but it may be arranged at an arbitrary position of the lens. It should be noted that θ _d may be arbitrarily set according to the required light distribution angle, for example, within a range of half the lower luminous intensity. Although the symmetry axis of the light distribution is the same as the central axis of the lighting device here, the symmetry axis of the light distribution may pass through any point in the light emitting surface of the LED light source.

With this configuration, the illumination device 100 can obtain a light distribution angle corresponding to the lens 30, and the light emission efficiency is also improved. In FIG. 5, the distance r _m and the distance l _m indicate that the end of the lens connector 50 is targeted.

  Unlike the case shown in FIG. 1B, the column 21 does not need to be curved, as in the illumination device according to the modification of the first embodiment shown in FIG. As shown in FIG. 6, the support column 21 may have a surface inclined with respect to the central axis, or may have a surface parallel to the central axis. Since the column 21 is not curved, the volume of the column 21 is increased and the manufacturability of the column 21 is improved.

  Further, as in the present embodiment, the shape of the substantially cylindrical portion of the support column 21 is curved along the inner surface of the globe 10 and the space between the support column 21 and the globe 10 is widened, thereby promoting convection, that is, suppressing fluid resistance. In addition, heat dissipation from the support column 21 to the globe 10 can be promoted.

  In the present embodiment, the circumferential length in a cross section perpendicular to the central axis of the support column 21 is gradually reduced as the distance from the base 20 increases. Accordingly, it becomes possible to reduce the surface area of the support column 21 and the cross-sectional area perpendicular to the central axis in accordance with the amount of heat that gradually decreases due to heat radiation from the surface of the support column 21, reducing the weight and reducing the weight of the lighting device 100. Transparency can be improved.

  As in this embodiment, the column 21 has a cavity, and has openings at only one end on the base 60 side or both ends including the end on the light source 41 side. By providing an opening on the side surface, the wiring 90 that is electrically connected to the LED 40 can be contained up to the base 60, and the appearance is improved, and at the same time, the possibility of unintentional play of the wiring and blocking light is reduced. be able to.

  The lens connector 50 is screwed to the base 20 with screws or the like, and the lens 30 is fixed with an adhesive or the like. Then, a gap is provided between the lens 30 and the light source 40 as shown in FIG. By providing a gap between the lens 30 and the light source 40, it is possible to avoid the influence due to the difference in coefficient of thermal expansion between the light source 40 and the lens 30. Further, the lens 30 can be moved away from the light source 40 that is at a high temperature, that is, the temperature of the lens 30 can be made equal to or lower than the temperature of the light source 40. With this configuration, when a material having a temperature lower than the heat resistance temperature of the light source 40 is used as the material of the lens 30, for example, a material such as acrylic, a larger amount of light can be obtained by supplying more power to the light source 40. It becomes.

  The wiring 90 may be directly connected to the base, or one of them may be connected to the base 20. By connecting the wiring 90 to the base 20, the amount of wiring can be reduced and the appearance can be improved. In this case, means for electrically connecting the support column 21 and the substrate 41, such as making the base 20, the globe connector 22, and the base connector 23 conductive parts, is required.

  In this embodiment, the base 20, the support column 21, the globe connector 22, and the base connector 23 are separate components, but some or all of them may be integrated components. In this case, it is difficult to manufacture parts. However, it is possible to remove the contact thermal resistance at the joint between the components, and the heat dissipation performance can be further improved.

  In the present embodiment, the base connector 60 has electrical conductivity. However, the base connector may be made of a material having high electrical insulation (PBT (Polybutylene terephthalate), polycarbonate, PEEK (Polyetheretherketone, etc.)) Alternatively, a layer having high electrical insulation may be formed on the surface. In this case, when an electric circuit (not shown) is arranged inside the base connector 60, an electrical problem can be avoided. Note that both the positive electrode and the negative electrode of the wiring 90 are connected to the electric circuit. The wiring 90 is directly connected to the base when there is no electric circuit.

  In the present embodiment, it is assumed that the power supply circuit is disposed outside the lighting device 100, but the power supply circuit may be housed inside the base 60, the base connector 23, and the support column 21.

  According to the illuminating device 100 of this embodiment, since the support | pillar 21 is provided in the globe 10, it can thermally radiate efficiently and it becomes possible to improve the thermal radiation performance of the illuminating device 100. FIG.

  As described above, according to the present embodiment, the heat dissipation performance can be improved, so that a higher-power LED can be used, and thereby the total luminous flux can be increased. In addition, since a light distribution angle corresponding to a lens can be obtained, the light emission efficiency can be improved.

(Second Embodiment)
A lighting apparatus according to the second embodiment is shown in FIG. The illumination device 100A according to the second embodiment has a configuration in which a light guide column 31 is used instead of the lens 30 in the illumination device 100 according to the modification of the first embodiment shown in FIG. In the present specification, the lens 30 and the light guide column 31 are also referred to as light guide members. The light guide column 31 includes a base portion 31a and a distal end portion 31b, and a cavity is formed inside by joining both of them. For example, a scatterer 32 is inserted into this cavity. The scatterer 32 has, for example, a structure in which a titanium oxide powder having a particle size of about 1 μm to 10 μm is sealed with a transparent resin and rounded into a spherical shape. Alternatively, as the scatterer 32, the inner surface of the cavity may be roughened by sandblasting or painted. The light incident on the light guide column 31 from the light source 40 is emitted to the outside by being scattered in the cavity. By using the light guide column 31, light can be emitted to the outside from a position away from the light source 40, and the appearance is closer to an incandescent bulb. In addition, you may comprise the light guide column 31 only by the base 31a, without using the front-end | tip part 31b.

  For example, if the center point O of the light distribution of the light guide column is provided so as to coincide with the center of the globe 10, the light from the light source 40 is emitted from the center point O, that is, the center of the globe. The maximum diameter of the light guide column 31 is equal to or less than the diameter of the opening of the globe 10. Thereby, the light guide column 31 can be inserted into the globe 10. As the material of the light guide column 31, it is preferable to use acrylic, polycarbonate, cycloolefin polymer, glass, or the like that has high light transmittance.

  Similarly to the first embodiment, the second embodiment can improve the heat dissipation performance, so that a higher-power LED can be used, thereby increasing the total luminous flux.

  Also in the illumination device 100A of the second embodiment, a light distribution angle corresponding to the light guide column 31 can be obtained, and the light emission efficiency can be improved.

(Third embodiment)
A lighting device according to the third embodiment is shown in FIG. The illuminating device 100B of this 3rd Embodiment is the structure which used the cover 24 newly so that a part of base 31a might be covered on the side surface of the light guide column 31 in the illuminating device 100A of 2nd Embodiment shown in FIG. have. The cover 24 may or may not be provided with the radiation layer 81 on the surface. By using the cover 24, direct light from the light source 40 can be prevented from being irradiated to the outside. Moreover, by using the cover 24, even when the light guide column 31 is extended, a heat radiation area can be secured, and the heat radiation performance of the lighting device 100A can be improved.

  The cover 24 may be integrally formed in combination with at least one of the support column 21, the base 20, and the board connector 50. As the material of the cover 24, for example, a material having excellent thermal conductivity such as an aluminum alloy or a copper alloy is used. In order to suppress absorption of light emitted from the light source 40, the inner surface of the cover 24 may be subjected to coating, polishing, or mirror finishing by metal deposition. For example, if a material having low visible light absorption such as white paint is used, the light loss on the inner surface of the cover 24 can be reduced.

  Similarly to the first embodiment, the third embodiment can improve the heat dissipation performance, so that a higher-power LED can be used, and thereby the total luminous flux can be increased. Moreover, while increasing the ratio of the surface of the globe 10 on the outer surface of the illumination device 100B, the surface area of the opaque member disposed inside the globe 10 can be reduced, and the transparency of the illumination device 100B is improved.

Further, in the third embodiment, by accommodating the cover 24 only on the inner side of the half light distribution angle theta _d of Shirubekohashira 31, the lighting device 100A can obtain light distribution angle corresponding to Shirubekohashira 31 Thus, the luminous efficiency can be improved. The cover 24 may be used together with the lens 30 that is a light guide member.

(Fourth embodiment)
FIG. 9 shows a lighting device according to the fourth embodiment. In the illumination device 100C of the fourth embodiment, in the illumination device 100B of the third embodiment shown in FIG. 8, the ventilation holes 91 for newly connecting the outer surface and the inner surface are provided in the support column 21 and the cover 24, respectively. It has a configuration. It is desirable to have a plurality of ventilation holes 91 in the gravity direction together with the opening of the cover 24 in order to allow air to flow inside the support column 21 and the cover 24 like the streamline 71. In order to connect the ventilation of the support column 21 and the cover 24, ventilation holes may be provided in the base 20 and the lens connector 50. By providing the ventilation holes, heat can be radiated not only from the surfaces of the support columns 21 and the cover 24 but also from the inner surfaces, and the heat radiation performance can be further improved as compared with the lighting device 100B of the third embodiment. Thereby, while increasing the ratio of the surface of the globe 10 in the outer surface of the illumination device 100C, the surface area of the opaque member arranged inside the globe 10 can be reduced, and the transparency of the illumination device 100C is improved. .

  In the fourth embodiment, since it is possible to further improve the heat dissipation performance, it is possible to use a higher-power LED, thereby increasing the total luminous flux.

  In the fourth embodiment, similarly to the third embodiment, a light distribution angle corresponding to the light guide column 31 can be obtained, and the light emission efficiency can be improved.

(Fifth embodiment)
A lighting device according to the fifth embodiment is shown in FIG. The illumination device 100D according to the fifth embodiment has a configuration in which uneven fins are newly provided on the support column 21 and the cover 24 in the illumination device 100B according to the third embodiment shown in FIG. FIG. 10B shows a cross section of the fin cut along the cutting line BB. As shown in FIG. 10B, the heat radiation area can be increased by providing uneven fins on the outer surfaces of the columns 21 and the cover 24, and the heat radiation performance is further improved as compared with the lighting device 100B of the third embodiment. Can be made. Thereby, while the ratio of the surface of the globe 10 in the outer surface of the illumination device 100D illumination device can be increased, the surface area of the opaque member arranged inside the globe 10 can be reduced, and the transparency of the illumination device 100D can be improved. improves.

  In the fifth embodiment, since it is possible to further improve the heat dissipation performance, it is possible to use a higher-power LED, thereby increasing the total luminous flux.

  In the fifth embodiment, similarly to the third embodiment, a light distribution angle corresponding to the light guide column 31 can be obtained, and the light emission efficiency can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

Claims (48)

A glove with an opening at one end and a hollow inside,
A base housed in the glove,
A light source having at least one LED housed in the globe and disposed on the base;
A light guide member that is housed in the globe and covers a light emitting surface of the light source, and has light permeability;
A column that is housed in the globe and is provided on the opposite side of the light source and the light guide member with respect to the base, and supports the base;
A radiation layer provided on the surface of the support column for radiating heat;
A globe connector connected to the column at the one end of the globe;
A base connector connected to the globe connector;
A base connected to the base connector for supplying power to the light source;
Wiring for electrically connecting the base and the light source;
A lighting device comprising:   The lighting device according to claim 1, further comprising a cover surrounding the light guide member.   The lighting device according to claim 1, wherein the light guide member is a lens, and a maximum diameter of the lens is smaller than a diameter of the opening at the one end of the globe.   The lighting device according to claim 1, wherein the light guide member is a lens, and an outer surface of the lens has a shape similar to an inner surface of the globe.   The light guide member is a light guide column having a hollow inside or a concave portion at a tip portion, and a scatterer is provided in the cavity or the concave portion of the light guide column, or a surface on which the hollow or the concave portion is formed is coated. The illuminating device according to claim 1, wherein a blast treatment is applied.   The lighting device according to claim 1, wherein a circumferential length of the support in a cross section perpendicular to a central axis of the support changes as it reaches the base side.   The lighting device according to claim 2, wherein a circumferential length of the cover in a cross section perpendicular to the central axis of the cover changes as it reaches the base side.   The lighting device according to claim 1, wherein the support column has a surface parallel to or inclined with respect to a central axis of the lighting device.   The lighting device according to claim 2, wherein the cover has a surface parallel or inclined with respect to a central axis of the lighting device.   The lighting device according to claim 1, wherein a cavity is provided inside the support column.   The lighting device according to claim 1, wherein the support has at least one hole through which the wiring passes.   The lighting device according to claim 2, wherein the cover has at least one hole through which the wiring passes.   The lighting device according to claim 1, wherein the support column includes a ventilation hole that connects the outer surface and the inner surface.   The lighting device according to claim 2, wherein the cover includes a ventilation hole that connects the outer surface and the inner surface.   The illuminating device according to claim 1, wherein the support column includes an uneven fin on an outer surface.   The lighting device according to claim 2, wherein the cover includes an uneven fin on an outer surface. The sum of the surface area of the strut and A _i, length sum l _g of the _strut, the radius r _i of when the sum of the surface area of the strut close to the equivalent _sphere, a junction of said light source and heat temperature the r _i r _imin when _made, obtained by in said strut and a plane perpendicular distance from the strut surface to the glove interior surface, integrating along the central axis of the strut from an upper end of the strut to the lower end the average distance When d _n, satisfies the following formula (1) to be,
4πr _imin ² ≦ A _i ≦ 2πd _n l _g (1)
When the thermal resistance of the entire lighting device is R _bulb (r _i ), the heat generation amount of the light source is Q _l , and the heat resistant temperature rise of the light source junction is ΔT _jmax , the following equation (2) is satisfied:
ΔT _jmax = R _bulb (r _imin ) Q _l (2)
The thermal resistance from the junction of the light source to the environment via the base is R _lc , the thermal resistance from the surface in contact with the outside of the globe connector to the environment is R _gc , and the thermal resistance from the junction of the light source to the surface of the column When R _lp , the thermal resistance from the surface of the globe to the environment is R _ga , and the thermal resistance due to convection and radiation between the support column and the globe is R _a (r _i ), the following equation (3) is satisfied. ,

When the thermal resistance due to convection between the support column and the globe is R _c (r _i ), and the thermal resistance due to radiation between the support column and the globe is R _r (r _i ), the following equation (4) The filling,

The average temperature T _i of the strut _surface, the average temperature T _o of the glove inner _surface, when the equivalent radius when the glove is approximated to a sphere and r _o, and satisfy the following equation (5),

When the average emissivity of the support surface is ε _i and the average emissivity of the globe inner surface is ε _o , the following equation (6) is satisfied.

When the volume expansion coefficient of air is β, the average temperature of the inner surface of the globe facing the column surface is T _g , the kinematic viscosity coefficient is v, the gravity is g, and the Grashof number is Gr _l , the following equation (7): Satisfy (8)

The lighting device according to claim 1. The sum of the surface area of the support column and the cover is A _i , the sum of the length of the support column and the cover is l _g , the radius when the sum of the surface area of the support column and the cover is approximated to an equivalent sphere, r _i , When the junction of the light source has a heat-resistant temperature, r _i is r _rim , and the distance from the support column and the cover surface to the inner surface of the globe in a plane perpendicular to the support column is from the upper end to the lower end of the support column and the cover When the average distance obtained by integrating along the central axis of the cover and the support column and d _n, satisfies the following formula (1),
4πr _imin ² ≦ A _i ≦ 2πd _n l _g (1)
When the thermal resistance of the entire lighting device is R _bulb (r _i ), the heat generation amount of the light source is Q _l , and the heat resistant temperature rise of the light source junction is ΔT _jmax , the following equation (2) is satisfied:
ΔT _jmax = R _bulb (r _imin ) Q _l (2)
The thermal resistance from the junction of the light source to the environment via the base is R _lc , the thermal resistance from the surface in contact with the outside air of the globe connector to the environment is R _gc , and from the junction of the light source to the column and the cover surface When the thermal resistance is R _lp , the thermal resistance from the surface of the globe to the environment is R _ga , and the thermal resistance due to convection and radiation between the column and the cover and the globe is R _a (r _i ), Satisfying the formula (3) of

The thermal resistance due to convection between the column and the cover and the globe is R _c (r _i ), and the thermal resistance due to radiation between the column and the cover and the globe is R _r (r _i ). Then, the following equation (4) is satisfied,

The strut and the mean temperature T _i of the surface of the _cover, the average temperature T _o of the glove inner _surface, when the equivalent radius when the glove is approximated to a sphere and r _o, and, the following equation (5) Meet,

When the average emissivity of the surface of the support column and the cover is ε _i and the average emissivity of the globe is ε _o , the following equation (6) is satisfied.

The volume expansion rate of the air beta, when the strut and the average temperature T _g of the said glove inner surface facing the _cover, the kinematic viscosity v, gravity g, the Grashof number and the Gr _l, the following equation (7 ), (8) is satisfied

The lighting device according to claim 2. The surface area of the support A _i is
A _i = 4πr _imin ²
The lighting device according to claim 17. The sum A _i of the surface area of the column and the cover is:
A _i = 4πr _imin ²
The lighting device according to claim 18. The angle θ _d is ½ of the light distribution angle of light emitted from the light guide member, and the base connector, the globe connector, the support column, the base, and the base in a plane perpendicular to the central axis of the light distribution optically opaque parts in the die, the distance from the central axis of the light distribution to the respective ends and r _m, said end from a plane perpendicular to the center as the central axis of the light guide member When the distance to the part and l _m, the minimum distance from the central axis of the facing surfaces and r _l to the light guide member of the light source, the distance r _m is
r _l ≦ r _m ≦ l _m | tan θ _d |
The lighting device according to claim 1, which is in the range of. The angle θ _d is ½ of the light distribution angle of light emitted from the light guide member, and in the plane perpendicular to the central axis of the light distribution, the base connector, the globe connector, the column, the base, mouthpiece, and the optically opaque part in the cover, the distance from the central axis of the light distribution to the respective ends and r _m, perpendicular to the passing through the center the center axis of the light guide member When the distance from the plane to the end and l _m, the minimum distance from the central axis of the facing surfaces and r _l to the light guide member of the light source, the distance r _m is
r _l ≦ r _m ≦ l _m | tan θ _d |
The lighting device according to claim 2 in the range of.   The lighting device according to claim 1, wherein the base connector is formed of ceramics or metal and has an opening on a surface connected to the support column.   The lighting device according to claim 1, wherein the base, the support column, the globe connector, and the base connector have conductivity, and the base connector is electrically connected to the light source. A glove with an opening at one end and a hollow inside,
A base housed in the glove,
A light source having at least one LED housed in the globe and disposed on the base;
A light guide member that is housed in the globe and covers a light emitting surface of the light source, and has light permeability;
A column that is housed in the globe and is provided on the opposite side of the light source and the light guide member with respect to the base, and supports the base;
A globe connector connected to the column at the one end of the globe;
A base connector connected to the globe connector;
A base connected to the base connector for supplying power to the light source;
Wiring for electrically connecting the base and the light source;
A lighting device comprising:   The lighting device according to claim 25, further comprising a cover surrounding the light guide member.   The lighting device according to claim 25, wherein the light guide member is a lens, and a maximum diameter of the lens is smaller than a diameter of the opening at the one end of the globe.   The lighting device according to claim 25, wherein the light guide member is a lens, and an outer surface of the lens has a shape similar to an inner surface of the globe.   The light guide member is a light guide column having a hollow inside or a concave portion at a tip portion, and a scatterer is provided in the cavity or the concave portion of the light guide column, or a surface on which the hollow or the concave portion is formed is coated. 26. The lighting device according to claim 25, wherein a blast treatment is applied.   26. The lighting device according to claim 25, wherein a circumferential length of the support in a cross section perpendicular to the central axis of the support changes as it reaches the base side.   27. The lighting device according to claim 26, wherein a circumferential length of the cover in a cross section perpendicular to a central axis of the cover changes as it reaches the base side.   The lighting device according to claim 25, wherein the support column has a surface parallel or inclined with respect to a central axis of the lighting device.   27. The lighting device according to claim 26, wherein the cover has a surface parallel or inclined with respect to a central axis of the lighting device.   The lighting device according to claim 25, wherein a cavity is provided inside the support column.   The lighting device according to claim 25, wherein the support column has at least one hole through which the wiring passes.   27. The lighting device according to claim 26, wherein the cover has at least one hole through which the wiring passes.   26. The lighting device according to claim 25, wherein the support column includes a vent hole that connects the outer surface and the inner surface.   27. The lighting device according to claim 26, wherein the cover includes a ventilation hole that connects the outer surface and the inner surface.   26. The illumination device according to claim 25, wherein the support column includes a concavo-convex fin on an outer surface.   27. The lighting device according to claim 26, wherein the cover includes an uneven fin on an outer surface. The sum of the surface area of the strut and A _i, length sum l _g of the _strut, the radius r _i of when the sum of the surface area of the strut close to the equivalent _sphere, a junction of said light source and heat temperature the r _i r _imin when _made, obtained by in said strut and a plane perpendicular distance from the strut surface to the glove interior surface, integrating along the central axis of the strut from an upper end of the strut to the lower end the average distance When d _n, satisfies the following formula (1) to be,
4πr _imin ² ≦ A _i ≦ 2πd _n l _g (1)
When the thermal resistance of the entire lighting device is R _bulb (r _i ), the heat generation amount of the light source is Q _l , and the heat resistant temperature rise of the light source junction is ΔT _jmax , the following equation (2) is satisfied:
ΔT _jmax = R _bulb (r _imin ) Q _l (2)
The thermal resistance from the junction of the light source to the environment via the base is R _lc , the thermal resistance from the surface in contact with the outside of the globe connector to the environment is R _gc , and the thermal resistance from the junction of the light source to the surface of the column When R _lp , the thermal resistance from the surface of the globe to the environment is R _ga , and the thermal resistance due to convection and radiation between the support column and the globe is R _a (r _i ), the following equation (3) is satisfied. ,

When the thermal resistance due to convection between the support column and the globe is R _c (r _i ), and the thermal resistance due to radiation between the support column and the globe is R _r (r _i ), the following equation (4) The filling,

The average temperature T _i of the strut _surface, the average temperature T _o of the glove inner _surface, when the equivalent radius when the glove is approximated to a sphere and r _o, and satisfy the following equation (5),

When the average emissivity of the support surface is ε _i and the average emissivity of the globe inner surface is ε _o , the following equation (6) is satisfied.

When the volume expansion coefficient of air is β, the average temperature of the inner surface of the globe facing the column surface is T _g , the kinematic viscosity coefficient is v, the gravity is g, and the Grashof number is Gr _l , the following equation (7): Satisfy (8)

The lighting device according to claim 25. The sum of the surface area of the support column and the cover is A _i , the sum of the length of the support column and the cover is l _g , the radius when the sum of the surface area of the support column and the cover is approximated to an equivalent sphere, r _i , When the junction of the light source has a heat-resistant temperature, r _i is r _rim , and the distance from the support column and the cover surface to the inner surface of the globe in a plane perpendicular to the support column is from the upper end to the lower end of the support column and the cover When the average distance obtained by integrating along the central axis of the cover and the support column and d _n, satisfies the following formula (1),
4πr _imin ² ≦ A _i ≦ 2πd _n l _g (1)
When the thermal resistance of the entire lighting device is R _bulb (r _i ), the heat generation amount of the light source is Q _l , and the heat resistant temperature rise of the light source junction is ΔT _jmax , the following equation (2) is satisfied:
ΔT _jmax = R _bulb (r _imin ) Q _l (2)
The thermal resistance from the junction of the light source to the environment via the base is R _lc , the thermal resistance from the surface in contact with the outside air of the globe connector to the environment is R _gc , and from the junction of the light source to the column and the cover surface When the thermal resistance is R _lp , the thermal resistance from the surface of the globe to the environment is R _ga , and the thermal resistance due to convection and radiation between the column and the cover and the globe is R _a (r _i ), Satisfying the formula (3) of

The thermal resistance due to convection between the column and the cover and the globe is R _c (r _i ), and the thermal resistance due to radiation between the column and the cover and the globe is R _r (r _i ). Then, the following equation (4) is satisfied,

The strut and the mean temperature T _i of the surface of the _cover, the average temperature T _o of the glove inner _surface, when the equivalent radius when the glove is approximated to a sphere and r _o, and, the following equation (5) Meet,

When the average emissivity of the surface of the support column and the cover is ε _i and the average emissivity of the globe is ε _o , the following equation (6) is satisfied.

The volume expansion rate of the air beta, when the strut and the average temperature T _g of the said glove inner surface facing the _cover, the kinematic viscosity v, gravity g, the Grashof number and the Gr _l, the following equation (7 ), (8) is satisfied

The lighting device according to claim 26. The surface area of the support A _i is
A _i = 4πr _imin ²
The lighting device according to claim 25. The sum A _i of the surface area of the column and the cover is:
A _i = 4πr _imin ²
The lighting device according to claim 26. Half of the light distribution angle of light emitted from the light guide member and the angle theta _d, in the center axis perpendicular to the plane of the light distribution, the cap connector, the globe connector, said post, said base, and optically opaque parts in the die, the distance from the central axis of the light distribution to the respective ends and r _m, from said plane perpendicular to the center as the central axis of the light guide member When the distance to the end and l _m, the minimum distance from the central axis of the facing surfaces and r _l to the light guide member of the light source, the distance r _m is
r _l ≦ r _m ≦ l _m | tan θ _d |
The lighting device according to claim 25, which is in the range of. The angle θ _d is ½ of the light distribution angle of light emitted from the light guide member, and in the plane perpendicular to the central axis of the light distribution, the base connector, the globe connector, the column, the base, mouthpiece, and the optically opaque part in the cover, the distance from the central axis of the light distribution to the respective ends and r _m, perpendicular to the passing through the center the center axis of the light guide member When the distance from the plane to the end and l _m, the minimum distance from the central axis of the facing surfaces and r _l to the light guide member of the light source, the distance r _m is
r _l ≦ r _m ≦ l _m | tan θ _d |
27. A lighting device according to claim 26.   The lighting device according to claim 25, wherein the base connector is formed of ceramics or metal and has an opening on a surface connected to the support column.   The lighting device according to claim 25, wherein the base, the support column, the globe connector, and the base connector have conductivity, and the base connector is electrically connected to the light source.

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