JP5328466B2 - Light bulb type lighting device - Google Patents

Description

The present invention relates to a light bulb-type illumination device that includes a light source and a cover that covers a side of the light source in the light emitting direction, and is configured to spread light distribution.

  2. Description of the Related Art Conventionally, as a lighting device used for indoor and outdoor lighting, a lighting device including a light source such as an incandescent bulb and a fluorescent lamp is used. 2. Description of the Related Art In recent years, various lighting devices including LEDs having characteristics such as small size, low power consumption, and long life as light sources have been proposed with increasing brightness of light emitting diodes (hereinafter referred to as LEDs) (for example, see Patent Document 1). .

  The LED light bulb disclosed in Patent Document 1 includes an LED mounted on a substrate, a lighting device that lights the LED, and the lighting device accommodated, a base attached to one side, and a substrate attached to the other side A cover, a translucent glove attached to the other side of the cover so as to cover the LED, and a diffusion sheet attached to substantially the entire outer surface of the glove.

JP 2008-91140 A

  By the way, conventional light sources such as incandescent bulbs and fluorescent lamps are light sources with low light directivity, and can irradiate light in all directions. On the other hand, an LED is a light source with strong light directivity, and its irradiation range is narrower than that of a conventional light source. For this reason, for example, when an LED is used as an alternative to a conventional incandescent bulb, it is necessary to configure the lighting device so as to widen the light distribution.

  Since the illuminating device according to Patent Document 1 is provided with a diffusion sheet over substantially the entire outer surface of the translucent glove provided so as to cover the LEDs, the light is diffused by the diffusion sheet in the glove. A substantially uniform luminance can be obtained, and the light distribution can be slightly widened. However, the side of the base that is the opposite side of the light emission direction of the LED remains dark. For example, when installed in a suspended state on the ceiling, the illuminance of the ceiling surface decreases, and when installed on the wall surface, the illuminance of the wall surface Will be reduced and the application will be limited.

  Thus, for example, it is conceivable to increase the number of LEDs and to configure the lighting device so that the LEDs are arranged so that light can be emitted in all directions. However, the illuminating device configured as described above has a problem that the number of LEDs to be used increases and heat dissipation measures need to be taken to suppress the temperature rise of each of these LEDs, and the structure becomes complicated.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bulb-type lighting device capable of spreading light distribution with a simple structure.

A light bulb-type illumination device according to the present invention is provided on the opposite side of the cover with a light source, a cover that covers the light emitting direction side of the light source and that transmits light from the light source, and the light source in between. And a reflector provided on the outer surface side of the cover and having a reflecting surface for reflecting the light transmitted through the cover , the reflecting surface being annular and formed so as to surround the light source In the light bulb-type illumination device that is inclined toward the opposite side of the light emitting direction from the side closer to the light center of the light source, the reflecting surface transmits light transmitted through the cover to the base. It is characterized by being reflected in the direction .

  In the present invention, the light emitting direction side of the light source is covered, and on the outer surface side of the cover that transmits light from the light source, a reflection surface that reflects the light transmitted through the cover is provided in order to spread light distribution. A reflector is provided. Light incident on the cover from the light source is transmitted through the cover and emitted from the cover, and a part of the emitted light is reflected by the reflection surface. By providing a reflective surface appropriately, light can be reflected on the opposite side of the light emission direction of the light source, and light distribution is widened by a simple structure in which a reflector having a reflective surface is provided on the outer surface side of the cover. Can do.

Further , the reflecting surface is formed on an inclined surface that is inclined from the inner side toward the outer side to the opposite side of the light emitting direction. Part of the light emitted from the cover is reflected by the reflection surface to the side opposite to the light emission direction of the light source. As a result, the light distribution can be widened by a simple structure in which a reflector having a reflecting surface is provided on the outer surface side of the cover.

The reflecting surface is annular and is formed so as to surround the light source. Part of the light emitted from the cover is reflected by the reflection surface to the side opposite to the light emission direction of the light source. As a result, the light distribution can be widened by a simple structure in which a reflector having a reflecting surface is provided on the outer surface side of the cover.

Lighting device in compact according to the present invention, the reflector is characterized that you have provided in the light emission direction side of the light source.

The bulb-type lighting device according to the present invention is characterized in that the light source is disposed on a substrate, the reflector further includes an attachment plate portion, and the substrate is attached to the attachment plate portion. you.

Lighting device in compact according to the present invention circumferentially provided a flange portion on the peripheral edge of the mounting plate portion and said tare Rukoto.

The bulb-type lighting device according to the present invention includes a heat radiator that dissipates heat from the light source, and the reflector is connected to a part of the heat radiator.

  In the present invention, the reflector is connected to the radiator that dissipates heat from the light source, and the heat radiation area increases by the amount of the reflector, which can contribute to the temperature reduction of the light source.

  According to the present invention, the light distribution can be widened with a simple structure.

It is a typical external appearance perspective view of the illuminating device which concerns on Embodiment 1 of this invention. 1 is a schematic exploded perspective view of a lighting device according to Embodiment 1. FIG. 1 is a schematic longitudinal sectional view of a lighting device according to Embodiment 1. FIG. It is a typical partial enlarged view of the reflector vicinity of an illuminating device. It is a typical external view of the illuminating device which concerns on Embodiment 2 of this invention. It is a typical partial enlarged view of the reflector vicinity of the illuminating device 200.

Hereinafter, the present invention will be described in detail by taking, as an example, a so-called LED bulb-type lighting device attached to a socket for an incandescent bulb, based on the drawings showing the embodiments.
(Embodiment 1)
FIG. 1 is a schematic external perspective view of lighting apparatus 100 according to Embodiment 1 of the present invention. FIG. 2 is a schematic exploded perspective view of lighting apparatus 100 according to Embodiment 1. FIG. FIG. 3 is a schematic longitudinal sectional view of the illumination device 100 according to the first embodiment.

  In the figure, reference numeral 1 denotes an LED as a light source. The LED 1 is, for example, a surface-mounted LED that includes an LED element, a sealing resin that seals the LED element, and phosphors are dispersed, and an input terminal and an output terminal. Such LEDs 1, 1... Are mounted on the one surface 11 a of the mounting substrate 11 having a disc shape so as to be arranged in six equal parts in the circumferential direction.

  The mounting substrate 11 on which the LEDs 1, 1... Are mounted is attached to the radiator 3 via the reflector 2. The reflector 2 includes a disk-shaped mounting plate portion 21 to which the mounting substrate 11 is mounted on one surface 21a. A collar portion 22 is provided around the periphery of the one surface 21 side of the mounting plate portion 21. Further, the attachment plate portion 21 is provided with a reflection ring 23 concentrically spaced from the attachment plate portion 21 by an appropriate length. The mounting plate portion 21 and the reflection ring 23 are connected to the flange portion 22 by connecting portions 24, 24,. The reflector 2 is made of a metal such as aluminum and is integrally formed.

  On the mounting plate portion 21 side of the reflection ring 23, a reflection surface 23a for reflecting light from the LEDs 1, 1,... Is formed in an annular shape so as to surround the LEDs 1, 1,. The reflection surface 23a is directed from the side closer to the optical center of the LEDs 1, 1,..., Which are light sources, in other words, from the inner side toward the outer side of the reflection ring 23, as shown in FIG. It is formed in the inclined surface which inclines continuously linearly (on the opposite side to the light emission direction). An inclined surface 22a that is chamfered is formed on one side of the flange portion 22 (the side of the reflection ring 23).

  The mounting board 11 on which the LEDs 1, 1... Are mounted on the one surface 21a of the mounting plate portion 21 of the reflector 2 thus configured is mounted so that the LEDs 1, 1. It is.

  The reflector 2 is attached to one surface 31 a of the heat radiating plate 31 that forms the disk shape of the heat radiating member 3 on the other surface of the attachment plate portion 21. A flange 32 is provided around the periphery of the heat radiating plate 31. On the other surface 31 b of the heat radiating plate 31, a heat radiating cylinder 33 that is concentric with the heat radiating plate 31 and has a cylindrical shape is provided upright.

  Concave portions 33a, 33a are formed in two equal portions in the circumferential direction on the inner surface of the heat radiating tube 33 on the heat radiating plate 31 side. Further, a plurality of fins 34, 34... Projecting radially outward along the axial length direction are provided on the outer peripheral surface of the heat radiating tube 33 so as to be evenly spaced in the circumferential direction. One end in the axial direction of the plurality of fins 34, 34... Is connected to the other surface 31 b of the heat radiating plate 31 of the heat radiating body 3. The radiator 3 is made of a metal such as aluminum and is integrally formed. The reflector 2 is fixed to the radiator 3 by screwing the flange 22 of the reflector 2 to the flange 32 of the radiator 3. In addition, since the reflector 2 and the heat radiating body 3 are made of a good heat conductive material, heat generated in the LEDs 1, 1... Is efficiently transmitted to the heat radiating body 3 through the reflector 2, and is dissipated to the outside. become.

  The heat radiator 3 is provided with a base 5 through an insulating case 4. The insulating case 4 has a cylindrical shape, and includes a radiator holding cylinder 41 for holding the radiator 3, a cylinder holding cylinder 42 for holding the cap 5, and a radiator holding cylinder 41 and a nozzle holding cylinder 42. And a connecting portion 43 to be connected. The radiator holding cylinder 41, the base holding cylinder 42, and the connecting portion 43 are made of an electrically insulating material such as resin, and are integrally formed.

  The radiator holding cylinder 41 is formed with engaging portions 44, 44 that are engaged with recesses 33 a, 33 a provided in the radiator cylinder 33 of the radiator 3 so as to be equally spaced in the circumferential direction. The engaging portions 44, 44 are integrally formed with the radiator holding cylinder 41, an arm portion extending along the axial length direction of the radiator holding cylinder 41, and an engaging claw provided at an extended end of the arm portion It has. The insulating case 4 is inserted into the heat radiating cylinder 33 of the heat radiating body 3 from the side of the heat radiating body holding cylinder 41 and is engaged with the heat radiating body 3 by engaging the engaging portions 44 and 44 with the recesses 33a and 33a. It has become.

  The base 5 has a bottomed cylindrical shape, and includes a one-pole terminal 51 having a cylindrical portion that is threaded to be screwed into a socket for a light bulb, and a protruding part on the bottom surface of the base 5. The electrode terminal 52 is provided. These one-pole terminals 51 and other-pole terminals 52 are insulated. The outer shape of the cylindrical portion of the base 5 is formed in the same shape as the screw-type base of E17 or E26, for example. The base 5 is integrated with the insulating case 4 by inserting and fixing the base holding cylinder 42 of the insulating case 4 inside the base 5.

  A power supply circuit portion 6 is accommodated in a cavity formed by the heat radiator 3 and the insulating case 4 integrated as described above. The power supply circuit unit 6 is formed by mounting a plurality of circuit components on a circuit board 61. One pole terminal 51 and another pole terminal 52 of the base 5 are electrically connected to the power supply circuit section 6 via lead wires (not shown). The power supply circuit unit 6 is electrically connected to the LEDs 1, 1... Via lead wires (not shown). In addition, you may make it electrically connect using a pin plug instead of a lead wire.

  A cover 7 is attached to the reflector 2 so as to cover the light emitting direction side of the LEDs 1, 1... And transmit the light from the LEDs 1, 1. The cover 7 has a hemispherical shell shape. The cover 7 is made of, for example, a milky white polycarbonate resin that is excellent in impact resistance and heat resistance and to which a diffusing agent is appropriately added.

  The cover 7 is inserted into the inside of the reflection ring 23 from the opening side, and the end of the cover 7 is in contact with the mounting plate 21 of the reflector 2 as shown in FIG. 2 is attached. In the assembled state, the reflector 2 is appropriately configured so that the reflection surface 23a of the reflection ring 23 is located on the outer surface 7a side of the cover 7, and preferably along the outer surface 7a. Moreover, it is desirable that the reflector 2, the heat radiating body 3, the insulating case 4, the base 5 and the cover 7 are each assembled by screwing.

  The lighting device 100 configured as described above is connected to a commercial AC power source by screwing the base 5 into a socket for a light bulb. In this state, when the power is turned on, an alternating current is supplied to the power supply circuit section 6 through the base 5, and a direct current rectified by the power supply circuit section 6 is supplied to the LEDs 1, 1. 1 ... lights up.

  The light emitted from the LEDs 1, 1... In response to power-on of the lighting device 100 enters the cover 7, is transmitted through the cover 7 while being diffused, and is emitted from the cover 7 with a predetermined spread. . FIG. 4 is a schematic partial enlarged view of the vicinity of the reflector 2 of the illumination device 100. A part of the light emitted from the cover 7 is provided along the outer surface 7a of the cover 7 as indicated by an arrow in FIG. 4, and is inclined to the side of the LEDs 1, 1,... Are reflected by the LED 1, 1,..., Which is a light source, in other words, by the base 5 side.

  In the illumination device 100 according to the present embodiment configured as described above, after the light emitted from the directional LEDs 1, 1... Is diffused in the cover 7 made of a material having light diffusibility. A part of the light emitted from the cover 7 is further reflected by the reflecting surface 23 a of the reflector 2 toward the base 5. As a result, the light distribution can be widened by a simple structure in which the reflector 2 having the reflecting surface 23a is provided. Since the reflection surface 23a side of the edge 22 of the reflector 2 is chamfered, the light emitted from the cover 7 or the light reflected by the reflection surface 23a is reflected in the light emission direction of the LEDs 1, 1,. Can be prevented.

  Further, since the reflector 2 is connected to the radiator 3 that dissipates heat from the LEDs 1, 1... And the reflector 2 is made of a good heat conductive material, the heat generated by the LEDs 1, 1. While being able to transmit efficiently to the heat radiator 3 via the body 2, the heat radiation area can be increased by the amount of the reflector 2. As a result, it is possible to contribute to the temperature decrease of the LEDs 1, 1,.

  In the present embodiment, the reflecting surface 23a is continuously linearly inclined from the inside to the outside. However, the shape of the reflecting surface 23a is not limited to this, and the LEDs 1, 1,. In other words, any shape that can be reflected on the base 5 side may be used.

  Moreover, in this Embodiment, although the reflector 2 is formed separately from the heat radiator 3, it cannot be overemphasized that the reflector 2 and the heat radiator 3 may be formed integrally.

(Embodiment 2)
In lighting device 100 according to Embodiment 1, a reflector having only one reflecting surface is provided, but a reflector having a plurality of reflecting surfaces may be provided. A lighting device provided with a plurality of reflecting surfaces will be described below. FIG. 5 is a schematic external view of illumination apparatus 200 according to Embodiment 2 of the present invention. FIG. 6 is a schematic partial enlarged view of the vicinity of the reflector of the lighting device 200.

  In the figure, reference numeral 70 denotes a cover provided so as to cover the light emitting direction side of an LED (not shown) as a light source. The cover 70 has a spherical shell shape. The cover 70 is, for example, made of milky white polycarbonate resin that has excellent impact resistance and heat resistance and is appropriately added with a diffusing agent.

  The cover 70 is held by the holding member 8. The holding member 8 has a partial spherical shell shape and has a base portion 81 for holding the LED inside. A plurality of (three in the figure) reflecting rings 83, 83... Are concentrically provided on the diameter-expanded side of the base 81 and spaced apart from the base 81 by an appropriate length. The base 81 and the reflection rings 83, 83... Are connected to the base 81 by connecting portions 84, 84. The holding member 8 is made of a metal such as aluminum and is integrally formed.

  On the base 81 side of the reflection rings 83, 83..., Reflection surfaces 83a, 83a... For reflecting light emitted from the cover 7 are formed in an annular shape so as to surround the LEDs. The reflecting surfaces 83a, 83a... Are directed toward the side farther from the side closer to the light center of the LED, in other words, as shown in FIG. 6, from the inner side toward the outer side of the reflecting rings 83, 83. In other words, it is formed on an inclined surface that continuously and linearly inclines on the side of the LED that is the light source (on the side opposite to the light emission direction). In addition, chamfered inclined surfaces 81b, 83b, and 83b are formed on the reflective ring 83, 83... Side of the base 81 and on the opposite side of the reflective surfaces 83a and 83a of the reflective rings 83 and 83, respectively. In the assembled state, the reflecting rings 83, 83,... Of the holding member 8 are appropriately arranged so that the reflecting surfaces 83a, 83a,... Are located on the outer surface 70a side of the cover 70, preferably along the outer surface 70a. It is configured.

  The holding member 8 configured in this manner functions as a radiator that dissipates the heat generated by the LED, and also functions as a reflector that reflects the light emitted from the cover 70 by the portions of the reflection rings 83, 83. The holding member 8 is attached to the base 5 via the insulating case 4 on the base 81 side. The insulating case 4 and the base 5 have the same configuration as that of the lighting device 100 according to the first embodiment, and thus description thereof is omitted.

  The light emitted from the LEDs in response to power-on of the lighting device 200 enters the cover 70, is transmitted while being diffused in the cover 70, and is emitted from the cover 70 with a predetermined spread. A part of the light emitted from the cover 70 is provided along the outer surface 70a of the cover 70 as shown by an arrow in FIG. 6, and is formed on an inclined surface that is inclined from the inside toward the outside toward the LED side. The reflecting surfaces 83a, 83a,... Are reflected on the LED side as the light source, in other words, on the base 5 side.

  In the illumination device 200 according to the present embodiment configured as described above, the light emitted from the directional LED is diffused in the cover 70 made of a material having light diffusibility, and then the cover 70. A part of the light emitted from the holding member 8 is further reflected by the reflecting surfaces 83a, 83a... Of the holding member 8 toward the base 5 side. As a result, the light distribution can be widened by a simple structure in which the reflecting rings 83, 83,... Having the reflecting surfaces 83a, 83a,. Since the reflection ring 83, 83 ... is chamfered on the opposite side of the reflection surface 83a, 83a ..., the light emitted from the cover 70 or the light reflected by the reflection surface 83a, 83a ... is reflected in the light emission direction of the light source. Can be prevented.

  In the illumination devices 100 and 200 according to the above embodiments, it is more desirable that a coating material having a high light reflectance (for example, a reflectance of 80% or more, preferably 90% or more) is applied to the reflecting surface of the reflector. . By applying a highly reflective paint to the reflecting surface, part of the light emitted from the cover can be efficiently reflected by the reflecting surface, and the light distribution can be further expanded. In addition, as such a paint, for example, a solder resist that is applied to an LED substrate and has high reflectivity (reflectance of about 90% at a film thickness of 60 μm), light resistance, and heat discoloration resistance can be used. .

  In the above embodiment, a reflector having one or three reflecting surfaces is provided. However, the number of reflecting surfaces is not limited to this, and the installation location of the lighting device, application, cover shape, and the like. It is set appropriately according to

  Moreover, in the above embodiment, the cover is formed in a hemispherical shell shape or a spherical shell shape, but the shape of the cover is not limited to this. The cover may be formed so that the cross-sectional shape in a surface substantially orthogonal to the light emission direction of the LED that is the light source is a circular shape, or may be formed so that the cross-sectional shape is a polygonal shape. In the above embodiment, the cover is made of milky white polycarbonate resin to which a diffusing agent is appropriately added, but the material is not limited to this, and the cover is made of a transparent resin to which no diffusing agent is added, It may be made of glass or the like.

  In the above embodiment, the shape of the opening of the reflector through which the light reflected by the reflecting surface of the reflecting ring passes is formed in a rectangular shape, but it goes without saying that the present invention is not limited to this.

  In the above embodiment, an LED is used as a light source. However, the present invention is not limited to this, and an EL (Electro Luminescence), an incandescent light bulb, or the like may be used.

  Furthermore, in the above embodiment, the lighting device attached to the socket for the light bulb has been described as an example. However, the above-described structure for wide light distribution is not limited to such a lighting device, but other types of lighting devices. Needless to say, the present invention can be applied to various modifications within the scope of the matters described in the claims.

1 LED (light source)
2 Reflector 23a, 83a Reflecting surface 3 Heat radiating body 7, 70 Cover 7a, 70a Outer surface 8 Holding member (heat radiating body, reflector)

Claims (5)

A light source, a cover that covers the light emission direction side of the light source, transmits light from the light source, a base that is provided on the opposite side of the cover with the light source in between, and an outer surface side of the cover And a reflector having a reflecting surface for reflecting the light transmitted through the cover, the reflecting surface being annular and surrounding the light source, from the side closer to the light center of the light source In a bulb-type lighting device that is inclined toward the far side to the opposite side of the light emitting direction ,
The reflective surface is
Bulb-type lighting device, characterized in that the light transmitted through the cover are to be reflected towards the mouthpiece. The reflector is
Bulb-type lighting device according to claim 1, characterized that you have provided in the light emission direction side of the light source. The light source is disposed on a substrate;
The reflector further includes a mounting plate portion,
Bulb-type lighting device according to claim 1 or 2, characterized in Citea Rukoto to attach the substrate to the mounting plate portion. The bulb-type lighting device according to claim 3 , wherein a flange portion is provided around the periphery of the mounting plate portion . A radiator that dissipates heat from the light source;
The reflector is
The bulb-type lighting device according to any one of claims 1 to 4 , wherein the lighting device is connected to a part of the radiator.

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