JP2012204088A - Led bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED bulb capable of illuminating a wide range with light emitted from a light source consisting of LEDs, and capable of improving heat dissipation performance of the light source.SOLUTION: The LED bulb 1 is provided with a metal body 2, a cap, a plurality of LED light sources 21, a translucent globe 25 and a lighting device 15. The body 2 housing the lighting device 15 includes a peripheral part 3 exposed outside. At an end part of the peripheral part 3, a light source mounting part 6 and a globe connecting part 5 are provided. The cap is arranged at the other end part side of the peripheral part 3. Each LED light source 21 is arranged at the light source mounting part 6 in a peripheral direction of the body 2 with a given interval in between. The globe 25 includes a globe end part 25a, and a light incident surface 29 facing to the LED light source 21 and a body connecting part 30 are provided at its end part. The main connecting part 30 is connected to the globe connecting part 5, the LED light sources 21 are covered with the globe end part 25a to mount the globe 25 on the body 2.

Description

  Embodiments of the present invention relate to an LED bulb including an LED light source, for example.

  A radiator (main body) provided with heat radiation fins in multiple stages, an LED source (light source) attached only at the center of one end of the radiator, and attached to one end of the radiator covering the LED source An LED bulb that includes a bulb (glove) and a base attached to the other end of the radiator via a cylindrical member is known as a prior art.

  Since the light emitted from the LED source is highly linear, the brightness on the peripheral side of the bulb is relatively lower than the brightness on the central portion of the bulb. In such an illumination with an LED bulb, although the area directly under the LED bulb is bright, the corners of the room are slightly darker, so it is difficult to illuminate a wide range of the room with the same brightness as an incandescent bulb. There is.

  Furthermore, since the distance between the LED source and the bulb covering the LED source is large, it is difficult to easily spread the heat generated by the LED source to the bulb and to release it from the bulb to the outside. For this reason, the heat of the LED source is exclusively conducted to the heat radiating body and released from the heat radiating body into the atmosphere, thereby suppressing an excessive temperature rise of the LED source. In order to maintain a predetermined emission color, further improvement in heat dissipation performance is desired.

JP 2005-166578 A

  An embodiment is to provide an LED bulb that can illuminate a wide range with light emitted from an LED light source and can also improve the heat dissipation performance of the light source.

  In order to solve the above problems, an LED bulb according to an embodiment includes a metal main body, a base, a plurality of LED light sources, a translucent globe, and a lighting device. The main body that houses the lighting device has a peripheral portion that is exposed to the outside. A light source mounting portion and a globe connection portion are provided at one end of the peripheral portion. A base is disposed on the other end side of the peripheral portion. Each LED light source is disposed at a predetermined interval in the circumferential direction of the main body on the light source mounting portion. The globe has a globe end portion, and a light incident surface and a main body connection portion facing the LED light source are provided at the end portion. The main body connecting portion is connected to the globe connecting portion, and the globe is attached to the main body by covering the LED light source at the end of the globe.

It is a schematic perspective view which shows the main body of the LED bulb which concerns on Example 1 with the glove | separated from this. It is sectional drawing which expands and shows a part of LED bulb of FIG. It is a schematic perspective view which shows the main body of the LED bulb which concerns on Example 2 with the glove | separated from this. It is sectional drawing which expands and shows a part of LED bulb of FIG. It is sectional drawing which expands and shows a part of LED bulb which concerns on Example 2. FIG.

  The LED light bulb of Embodiment 1 has a peripheral part exposed to the outside, a metal main body provided with a light source mounting part and a globe connection part at one end part of the peripheral part; and the other end side of the peripheral part A plurality of LED light sources disposed on the light source mounting portion at a predetermined interval in the circumferential direction of the main body; a globe in which a light incident surface facing the LED light source and a main body connection portion are formed A translucent glove having an end portion, connecting the main body connection portion to the glove connection portion and covering the LED light source with the glove end portion and attached to the main body; and a lighting device housed in the main body And characterized by comprising:

  In the first embodiment, the metal constituting the main body includes iron and its alloys, or metals having better thermal conductivity such as copper and its alloys, and lighter light metals such as iron and its alloys such as aluminum and its alloys. Can be used. In the first embodiment, as a configuration for increasing the heat radiation area from the peripheral portion of the main body, it is possible to roughen the outer peripheral surface of the peripheral portion by knurling the peripheral portion. Can also be formed on the periphery. In the first embodiment, an E-type base can be suitably used as the base, but is not limited thereto.

  In the first embodiment, the plurality of LED light sources may be arranged at predetermined intervals in the circumferential direction of the main body on the light source mounting portion, either at regular intervals or at irregular intervals. In the first embodiment, the LED light source refers to a light source having a light emitting element composed of an LED (light emitting diode), and the LED light source may be a bullet type LED, a COB type LED, or an SMD. A type LED or the like may be used.

  In the first embodiment, the globe is preferably made of a light-transmitting synthetic resin material, such as transparent, translucent (including colored transparent), or milky white, and acrylic as such a synthetic resin. Resin etc. can be illustrated. At the same time, in the first embodiment, the globe is preferably substantially hemispherical, for example, but may be substantially conical. In addition, for example, the globe may have an arbitrary shape in order to diffuse or condense light emitted from the LED light source. Is also possible. Furthermore, in Embodiment 1, the light incident surface of the globe may be provided corresponding to each of the plurality of LED light sources, or may be provided in a ring shape along the circumferential direction of the globe. In Embodiment 1, the lighting device is housed in the main body, but a part of the lighting device is disposed inside the base, inside the glove, or inside each base and glove. Also good.

  In the LED light bulb of Embodiment 1, the light emitted from each LED light source with energization to the lighting device is incident on the inside of the globe itself from the light incident surface formed at the annular globe end portion of the globe, As it propagates toward the center of the glove, it is released from the surface of the glove to the surroundings. As described above, illumination is performed by making light incident on a plurality of locations at the end of the globe. As a result, the light distribution performance around the globe is improved, so that a wide range can be illuminated with the light emitted from the LED light source.

  Furthermore, in the LED light bulb of Embodiment 1, since the end of the globe on which the light from the LED light source enters is close to the light source mounting portion of the main body, the radiant heat emitted from the LED light source is directly spread to the globe. . For this reason, in addition to heat radiation from the outer peripheral surface of the metal main body to the atmosphere, heat radiation from the globe to the atmosphere can be expected, thereby improving the heat radiation performance of the LED light source.

  The LED light bulb of Embodiment 2 is characterized by further comprising a central LED light source mounted on the main body facing the central portion of the globe in Embodiment 1.

  In the second embodiment, the central LED light source is a bullet-type LED, a COB-type LED, or an SMD type, similarly to a plurality of LED light sources arranged at predetermined intervals in the circumferential direction of the main body. An LED or the like may be used. Further, the central LED light source may be equal to or lower than the output of the plurality of LED light sources arranged at predetermined intervals in the circumferential direction of the main body.

  In the second embodiment, since the light emitted from the central LED light source further passes through the central portion of the globe in the first embodiment, the central portion of the globe that is relatively short relative to the brightness on the peripheral side of the globe. The lighting can be increased.

  The LED light bulb according to Embodiment 3 is provided with an annular light incident groove at the end of the globe which is open toward the main body and used as the light incident surface in the first or second embodiment. A groove is formed to provide the main body connection portion in an annular shape, the light source mounting portion is provided in an annular shape, and the light source mounting portion is formed to provide the globe connection portion in an annular shape. The globe is connected to the main body by fitting and adhering to the globe connecting portion.

  In the third embodiment, in the configuration in which the main body connection portion in which the light incident groove is formed is provided so as to protrude from the end face of the globe end portion, the glove connection portion is opened to one end of the peripheral portion of the main body and the main body connection portion is inserted. The light source mounting portion may be formed by a convex portion that fits into the light incident groove. On the other hand, in the configuration in which the globe connection part in which the light source mounting part is formed is provided so as to protrude from one end of the peripheral part of the main body in the third embodiment, the glove connection part is fitted into the light incident groove. The connecting portion may be disposed outside the globe connecting portion, and the bottom surface of the circular groove formed between the globe connecting portions may be used as the light source mounting portion.

In the third embodiment, the heat released from the LED light source to the light source mounting portion in the first or second embodiment is easily transmitted to the end of the globe via the main body connecting portion and the globe connecting portion that are fitted to each other. Therefore, it is possible to further improve the heat dissipation performance of the LED light source. In addition, by the fitting, a plurality of LED light sources arranged in the light source mounting portion and the light incident surface can be properly aligned and placed close to each other, and the light incident groove, the main body connection portion, the light source mounting Since the part and the glove connecting part are both circular, there is an advantage that when attaching the glove to the main body, there is no direction when fitting the glove end to the main body, and it is easy to connect the glove to the main body. In any one of Embodiments 1 to 3, the LED light bulb of Mode 4 is characterized in that a light reflecting member facing the inner space of the globe is provided on the globe.

  In the fourth embodiment, the light reflecting member may be provided on at least a part of the entire back surface of the globe in an LED bulb that does not include the central LED light source. In the LED bulb that does not include the central LED light source, the back surface of the globe may be used. For the region excluding the central part of the region, it may be provided in at least a part of this region. Furthermore, in Embodiment 4, the light reflecting member may be provided by being laminated on the back surface by vapor deposition or the like, or may be provided by being adhered by an adhesive sheet or the like.

  In Embodiment 4, since the light which is going to be emitted to the inner space of the globe among the light propagating inside the globe itself can be reflected toward the outside of the globe by the light reflecting member, as the entire globe becomes brighter, It is possible to illuminate a wide area more brightly with the light emitted from the LED light source.

  Hereinafter, the LED bulb of Example 1 will be described in detail with reference to FIGS. 1 and 2.

  1 and 2, an LED bulb (hereinafter abbreviated as “bulb”) includes a metal main body 2, an insulating member 11, a base 13, a lighting device 15, and a plurality of LED light sources (hereinafter referred to as light sources). And 21) a translucent glove 25.

  The main body 2 is made of a metal, for example, an integrally formed product of an aluminum alloy, and has a cylindrical peripheral portion 3 and an end wall 4 formed integrally with the peripheral portion 3 so as to close one end portion 3a of the peripheral portion 3. is doing.

  The outer surface of the peripheral portion 3 that functions as a heat radiating surface is exposed to the outside (in the atmosphere). The outer diameter of the peripheral portion 3 is gradually reduced from the one end portion 3a toward the other end portion. The other end of the peripheral portion 3 having a reduced diameter is opened. The main body 2 has a concave portion 2 a having an end wall 4 as a bottom inside thereof, and the concave portion 2 a is opened at the other end of the peripheral portion 3.

  The end wall 4 is provided so as to be shifted to the other end side (upper side in FIG. 2) of the peripheral portion 3 with respect to the one end surface 3 b of the peripheral portion 3. As shown in FIG. 2, a pair of globe connection portions 5 and a light source mounting portion 6 are provided at one end portion 3 a of the peripheral portion 3. The pair of globe connection portions 5 is formed of, for example, a pair of large and small annular grooves that are open to the one end surface 3b. The light source mounting portion 6 is formed of an annular portion located between the pair of large and small globe connecting portions 5 in the one end portion 3 a of the peripheral portion 3. Therefore, the light source mounting portion 6 is formed by being partitioned by the pair of inner and outer globe connecting portions 5. If the bottom of the globe connection part 5 is used as a reference, the light source mounting part 6 is formed by an annular convex part.

  An insulating member 11 shown in FIG. 1 is a molded body of a heat-resistant synthetic resin such as polybutylene terephthalate, and has a cylindrical shape with both ends open. The insulating member 11 is connected to the peripheral portion 3 of the main body 2, and the outer surface thereof is continuous with the outer surface of the peripheral portion 3. The insulating member 11 is gradually reduced in diameter as it is away from the peripheral portion 3.

  A base 13 (see FIG. 1) for supplying power to a lighting device 15 to be described later is, for example, an E type having a spiral groove on a metal peripheral surface portion, and is detachably screwed onto a lamp socket (not shown). The base 13 is disposed on the other end side of the peripheral portion 3. Specifically, the base 13 is connected to the end portion of the insulating member 11 that is gradually reduced in diameter. Therefore, the insulating member 11 is interposed between the peripheral surface portion of the base 13 and the metal main body 2 to electrically insulate them from each other and also to thermally insulate them.

  The lighting device 15 (see FIG. 2) is formed by attaching a plurality of circuit components (not shown) to a circuit board. The lighting device 15 is supported on the inner surface of the peripheral portion 3 of the main body 2 and is accommodated over the concave portion 2 a of the main body 2 and the inside of the insulating member 11. The lighting device 15 is electrically connected to the base 13 via an electric wire having an insulating sheath (not shown). At the same time, the lighting device 15 has an insulating sheath and is connected to another lead wire (not shown) wired through the end wall 4 of the main body 2 and a wiring board 22 to be described later connected to the wire. The light source 21 is electrically connected.

  In the first embodiment, the end wall 4 can be omitted, or a through hole through which the lighting device 15 can be passed can be provided in the end wall 4. In the configuration in which the through hole is provided in the end wall 4, a part of the lighting device 15 can be accommodated in the inner space of the globe 25 described later.

  A wiring board 22 is fixed on the light source mounting part 6 so as to conduct heat to the light source mounting part 6 by screwing or bonding. In the first embodiment, the wiring board 22 is commonly used for each light source 21 and is formed in an annular shape, for example, an annular shape. A plurality of light sources 21 are mounted on the wiring board 22. As shown in FIG. 1, these light sources 21 are arranged at predetermined intervals along the circumferential direction of the main body 2, for example, at regular intervals.

  The wiring board 22 may be a plurality of wiring boards 22 arranged in an arc shape, for example, in an annular shape. At the same time, the number of light sources 21 mounted on the plurality of wiring boards 22 can be at least one.

  The wiring board 22 is provided with a pattern layer made of a metal foil such as copper on one surface of an insulating plate and an insulating resist layer covering the pattern layer, and a heat made of a metal foil such as copper on the other surface of the insulating plate. A diffusion layer and an insulating resist layer covering the diffusion layer are provided. The light source 21 mounted on the wiring board 22 is electrically connected to the pattern layer.

  The wiring board 22 is fixed in close contact with the light source mounting part 6 with the heat diffusion layer on the back side, in other words, with the heat diffusion layer facing the light source mounting part 6. As a result, the heat generated by the light source 21 is transmitted to the heat diffusion layer having good heat conductivity through the insulating plate and diffused in a wide range by this heat diffusion layer, and then directly to the light source mounting portion 6 through the insulating resist layer. Can be conducted (released).

  For example, an SMD type LED is used as the light source 21 forming the light emitting unit. In the SMD type LED, a reflector having a frustoconical hole is bonded on a base provided with an electrode, and an LED chip which is a semiconductor light emitting element is mounted on the base forming the bottom surface of the reflector. The LED chip is formed by connecting the LED chip to the electrode by wire bonding or the like, and further filling the hole of the reflector with a translucent sealing member mixed with a phosphor and sealing the LED chip. The SMD type LED is disposed at a predetermined position by connecting an electrode drawn on the back surface of the base to the pattern layer of the wiring board 22.

  The LED chip is formed of a bare chip that emits blue light, for example, and the chip generates heat when the light is emitted. The phosphor mixed in the sealing member is a yellow phosphor that is excited by blue light emitted from the LED chip and emits yellow light so that the light source 21 emits white light. Is used. The LED chip included in the light source 21 is a semiconductor that directly converts electrical energy into light, and the light emission is realized by passing a forward current through a pn junction of the semiconductor. A semiconductor light-emitting element that emits light based on such a light emission principle has an energy saving effect as compared with an incandescent bulb that inclines a filament to a high temperature by energization and emits visible light by its thermal radiation.

  As shown in FIG. 2, the globe 25 is, for example, hemispherical, and is formed of a globe body 26, a light diffusing member 27, and a light reflecting member 28.

  The globe body 26 is formed in a hemispherical shape from a light-transmitting synthetic resin, for example, a transparent acrylic resin. Each of the front surface and the back surface of the globe body 26 is formed by a surface processed with laser light so that light propagating through the inside of the globe body 26 can be emitted from these surfaces. The light diffusing member 27 is a member having a performance of diffusing light, and for example, a milky white light diffusing sheet is used. The light diffusing member 27 is attached to the entire surface of the globe body 26. The light reflecting member 28 is a member having a performance of reflecting light, and for example, a white or silver light reflecting sheet is used. The light reflecting member 28 is attached to the entire back surface of the globe body 26 facing the inner space 25 c of the globe 25. The light reflecting member 28 may be provided on a part of the back surface of the globe body 26. In order to brighten the periphery of the globe 25, at least the back surface portion on the side of the globe end 25a that partitions the opening of the globe body 26. It is preferable to provide in.

  The globe end portion 25a has a shape corresponding to the shape of the one end portion 3a of the peripheral portion 3, for example, an annular shape. A light incident surface 29 and a main body connection portion 30 are formed on the globe end portion 25a.

  Specifically, an annular light incident groove 31 is formed in the globe end portion 25 a along the circumferential direction of the globe 25. The light incident groove 31 is open toward the main body 2, and its bottom surface is used as the light incident surface 29. The main body connection portion 30 is provided in an annular shape, and is formed by partitioning the light incident groove 31. The pair of large and small main body connection portions 30 protrude from the end face 25b of the globe end portion 25a.

  The globe 25 is attached to the main body 2 so as to cover each light source 21 with the globe end portion 25a. Specifically, the tip of the annular main body connecting portion 30 protruding from the end face 25b is fitted into the glove connecting portion 5 formed of an annular groove formed in the main body 2, so that the glove connecting portion 5 or the main body connection is made. It is adhered to the portion 30 with an adhesive 33 applied in an appropriate amount in advance. Due to the connection between the globe connecting portion 5 and the main body connecting portion 30, each light source 21 is inserted into the light incident groove 31 and is close to and opposed to the light incident surface 29.

  Each light source 21 emits light when the lighting device 15 of the light bulb 1 of the first embodiment is energized. The light emitted from each light source 21 is incident on the inside of the globe body 26 itself from the light incident surface 29 formed on the annular globe end portion 25 a of the globe 25, and toward the center of the globe body 26. Propagated. Along with this, light is emitted from the front and back surfaces of the globe body 26.

  The light emitted to the front side of the globe body 26 enters the light diffusing member 27, is transmitted while being diffused, and is emitted to the outside of the globe 25. Thus, since light is incident on a plurality of locations on the periphery of the globe 25, the periphery of the globe 25 becomes brighter, and light can be emitted from the periphery surface to the surroundings for illumination. Therefore, the light distribution performance around the globe 25 is improved, and it is possible to illuminate a wide range with the light emitted from each light source 21.

  Moreover, of the light propagating through the globe body 26, the light that is about to be emitted from the back surface of the globe body 26 to the inner space 25 c of the globe 25 is reflected toward the front side of the globe body 26 by the light reflecting member 28. Therefore, the reflected light can be diffused by the light diffusing member 27 and emitted to the outside of the globe 25. For this reason, the entire globe 25 becomes brighter, and accordingly, a wide range can be illuminated more brightly.

  Further, the heat generated by each light source 21 during lighting of the light bulb 1 is released to the light source mounting portion 6 formed on the peripheral portion 3 of the main body 2 through the wiring board 22 and then into the atmosphere from the surface of the peripheral portion 3. To be released. In this case, since the heat of the light source 21 is diffused by the heat diffusion layer of the annular wiring board 22 on which the light source 21 is mounted, the heat is transferred to the annular light source mounting portion 6 over a wide area. The heat conduction from each light source 21 to the peripheral portion 3 of the main body 2 is good. In addition, the globe end 25a that receives light from the light source 21 and the light source mounting portion 6 of the main body 2 are close to each other, and the radiant heat generated by the light source 21 is directly spread to the globe end 25a. Heat radiation is also possible from the surface side of 25a.

  Thus, in addition to heat radiation from the outer surface of the peripheral portion 3 of the metal main body 2 to the atmosphere, heat radiation from the globe 25 to the atmosphere can be expected, so that the heat radiation performance of the light source 21 can be improved. Therefore, it is possible to suppress an abnormal rise in the temperature of the LED chip included in the light source 21, and it is possible to suppress a decrease in the light emission efficiency and lifetime of the LED chip and a change in the light emission color.

  Moreover, in the light bulb 1 of the first embodiment, the light source 21 emits the light to the light source mounting part 6 via the main body connection part 30 of the glove end 25a and the glove connection part 5 of the main body 2 which are fitted and bonded to each other. Heat is easily transmitted to the glove end 25a. Thereby, the heat dissipation performance of the light source 21 can be further improved.

  When the globe 25 is connected to the one end 3a of the peripheral portion 3 of the main body 2, the glove connecting portion 5 of the main body 2 and the main body connecting portion 30 of the glove end 25a are fitted to each other as described above. The plurality of light sources 21 disposed in the light source mounting portion 6 and the light incident surface 29 of the globe 25 can be properly aligned and disposed close to each other. At the same time, since the light incident groove 31, the main body connecting portion 30, the light source mounting portion 6, and the globe connecting portion 5 are all circular, when connecting the glove 25 to the main body 2, the glove end 25 a is connected to the main body 2. There is no directionality when fitted to the one end 3a of the peripheral portion 3. For this reason, it is easy to connect the globe 25 to the main body 2.

  3 and 4 show the second embodiment. The second embodiment is different from the first embodiment in the configuration described below, and the other configurations are the same as those in the first embodiment. Therefore, the configuration having the same or similar functions as the first embodiment is described in the first embodiment. The same reference numerals as those in FIG.

  In the LED bulb 1 of the second embodiment, the end wall 4 of the main body 2 is separate from the peripheral portion 3 of the main body 2 as shown in FIG. The end wall 4 is fixed to a step portion 3b provided inside the one end portion 3a of the peripheral portion 3 with a plurality of screws 35, and is provided so as to close the one end portion 3a of the peripheral portion 3. The end wall 4 may be integrated with the peripheral portion 3.

  A central wiring board 36 is attached to the center of the end wall 4. The central wiring board 36 has the same configuration as that of the wiring board 22 and is provided with a pattern layer made of a metal foil such as copper on one surface of the insulating plate and an insulating resist layer covering the pattern layer. A heat diffusion layer made of a metal foil such as copper and an insulating resist layer covering the heat diffusion layer are provided on the surface. The central wiring board 36 is fixed so that the thermal diffusion layer is in close contact with the end wall 4.

  The central LED light source 37 is mounted on the central wiring board 36 and is electrically connected to the pattern layer. The central LED light source 37 faces at least the central rear surface of the globe 25. For example, a COB type LED is used as the central LED light source 37, but the present invention is not limited to this, and a plurality of SMD type LEDs may be used. The light emission area of the COB type LED is larger than the light emission area of the light source 21 composed of the SMD type LED.

  In the second embodiment, the light reflecting member included in the globe 25 is partially provided so that light emitted from the central LED light source 37 can enter the globe body 26 through its back surface. For example, in the second embodiment, the first light reflecting member 28a to the fifth light reflecting member 28e each having an annular shape are used. The first light reflecting member 28a is bonded to the inner peripheral central portion of the globe body 26, the fifth light reflecting member 28e is bonded to the inner peripheral surface of the globe end portion 25a, and the second light reflecting members 28b to 28b. The fourth light reflecting member 28d is located between the first light reflecting member 28a and the fifth light reflecting member 28e and is bonded to the inner peripheral surface of the globe body 26 at a predetermined interval. Therefore, the light emitted from the central LED light source 37 can enter the globe body 26 through the light reflecting members adjacent in the direction in which the central axis of the globe 25 extends.

  The light bulb 1 according to the second embodiment is the same as the first embodiment except for the matters described above. Therefore, also in this Example 2, the said subject is solved, it is possible to illuminate a wide range with the light which the several light source 21 emitted, and it is possible to improve the thermal radiation performance of the light source 21. FIG.

  In addition, during the lighting of the light bulb 1, the light emitted from the central LED light source 37 passes through the central portion of the globe 25 and illuminates the light immediately below the light bulb 1. For this reason, the brightness of the central part of the globe that is relatively deficient compared to the brightness of the peripheral part of the globe 25 that is directly illuminated by the plurality of light sources 21 arranged around the central LED light source 37. Can increase the lighting.

  In this case, the brightness of the entire globe 25 can be made substantially uniform by setting the output of the central LED light source 37 to be equal to or less than the outputs of the plurality of light sources 21 arranged at predetermined intervals in the circumferential direction of the main body 2. It is. Further, by making the output of the central LED light source 37 higher than the outputs of the plurality of light sources 21 arranged at predetermined intervals in the circumferential direction of the main body 2, it is possible to sufficiently ensure the brightness directly under the light bulb 1. is there.

  In the second embodiment, the lighting device 15 is provided with light emission selection means such as a switch for switching between lighting of the plurality of light sources 21 and lighting of the central LED light source 37, and a remote control receiver. It is also possible to adopt a configuration in which the switch is opened and closed by a remote controller that performs infrared communication or the like. In this case, the first illumination mode in which all the light sources emit light and the area around the bulb 1 can be illuminated in a wide range while brightly illuminating directly under the light bulb 1, and only the plurality of light sources 21 are caused to emit light to the first illumination mode. The second lighting mode in which the brightness of the direct lighting is reduced while illuminating the surroundings of the light bulb 1 in a wide range, and the third lighting mode in which only the central LED light source 37 emits light to perform the direct lighting of the light bulb 1 are arbitrarily controlled by remote control. Can be selected.

  FIG. 5 shows a third embodiment. The third embodiment is different from the second embodiment in matters described below, and the other configurations are the same as those in the second embodiment. Therefore, the configuration having the same or similar functions as the second embodiment is described in the second embodiment. The same reference numerals as those in FIG.

  The light bulb 1 according to the third embodiment includes a light distribution control member such as a lens 41 that is attached to the end wall 4 of the main body 2 and is housed in the inner space 25 c of the globe 25. The lens 41 has an incident surface 41a that is close to and faces the central LED light source 37, and condenses or diffuses the light from the central LED light source 37 incident from the incident surface 41a to the globe 25 from the output surface 41b. It is provided in order to emit light. The light distribution control member is not limited to the lens 41, and can be disposed for at least one of the plurality of light sources 21 and the central LED light source 37.

  Except for the matters described above, the second embodiment is the same as the second embodiment including the configuration not shown. Therefore, also in the third embodiment, the above-described problem is solved, and it is possible to illuminate the periphery of the light bulb 1 in a wide range with the light emitted from the plurality of light sources 21 while illuminating directly under the light bulb 1. The heat dissipation performance of 21 can be improved.

  Moreover, by providing the lens 41, when the light of the central LED light source 37 is dispersed by the light distribution control, it is possible to further increase the brightness for illuminating the periphery of the bulb 1 in a wide range. is there. Further, when the light of the central LED light source 37 is concentrated on the central portion of the globe 25 by the light distribution control of the lens 41, the brightness directly under the light bulb 1 can be further increased.

  DESCRIPTION OF SYMBOLS 1 ... Light bulb (LED light bulb), 2 ... Main body, 3 ... Circumference part, 3a ... One end part of a circumference part, 5 ... Light source mounting part, 6 ... Globe connection part, 13 ... Base, 15 ... Lighting apparatus, 21 ... Light source ( LED light source), 25 ... globe, 25a ... globe end, 25c ... inner space of globe, 28, 28a to 28e ... light reflecting member, 29 ... light incident surface, 30 ... main body connecting portion, 31 ... light incident groove, 33 ... Adhesive, 37 ... Central LED light source

Claims (4)

A metal main body having a peripheral portion exposed to the outside and having a light source mounting portion and a globe connection portion provided at one end of the peripheral portion;
A base disposed on the other end side of the peripheral portion;
A plurality of LED light sources disposed at predetermined intervals in the circumferential direction of the main body on the light source mounting portion;
A light incident surface facing the LED light source and a glove end portion formed with a main body connection portion are formed, the main body connection portion is connected to the glove connection portion, and the glove end portion covers the LED light source to the main body. With an attached translucent glove;
A lighting device housed in the body;
LED bulb characterized by comprising.   The LED bulb according to claim 1, further comprising a central LED light source mounted on the main body so as to face a central portion of the globe.   An annular light incident groove that is open toward the main body and whose bottom surface is used as the light incident surface is provided at the globe end portion, and the light incident groove is formed to provide the main body connection portion in an annular shape. The light source mounting portion is provided in an annular shape, the light source mounting portion is formed, the globe connecting portion is provided in an annular shape, and the main body connecting portion and the globe connecting portion are fitted and bonded together, thereby The LED bulb according to claim 1, wherein the LED bulb is connected to the main body.   The LED light bulb according to any one of claims 1 to 3, wherein a light reflecting member facing the inner space of the globe is provided in the globe.

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