JP2008091140A - LED bulb and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED bulb capable of easily obtaining approximately uniform luminance and lighting equipment having the LED bulb. <P>SOLUTION: The LED bulb 1 comprises light emitting diodes 2 mounted on a board 7, a lighting device 3 for lighting the light emitting diodes 2, a cover 4 for housing the lighting device 3 and having a base 10 on one end of the cover and the board 7 on the other end, a translucent globe 5 mounted on the other end of the cover 4 to cover the light emitting diodes 2, and a diffusion sheet 6 for coating approximately the whole outer surface of the globe 5 with its rim clamped between the cover 4 and the rim 5a of the globe 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an LED bulb mounted on a lamp socket and a lighting fixture including the LED bulb.

  In a light bulb having a point light source, for example, a diffusion film is formed on a glass bulb (glove) so that the high luminance of the point light source does not cause discomfort to humans. In addition, a film for preventing scattering of glass fragments during dropping or the like is also formed (see, for example, Patent Document 1). However, a light bulb (LED light bulb) having a light-emitting diode (LED) as a light source differs depending on the type of the light-emitting diode, such as the intensity of the light-emitting diode in the radiation direction and the incident position of the emitted light on the glass bulb. Accordingly, it has been difficult to form a uniform light diffusion on the glass bulb flexibly.

And the LED light bulb which wavelength-converted the emitted light from a light emitting diode as what can make the brightness | luminance of an LED light bulb substantially uniform is proposed (for example, refer patent document 2). This prior art LED bulb has a flat curved portion facing the light emitting diode at a predetermined distance from the surface where the light emitting diode is disposed, and a phosphor that converts the wavelength of the emitted light from the light emitting diode. A wavelength conversion cover provided on the curved surface portion is provided, and light can be output in a wide angle range from the wavelength conversion cover, and the entire wavelength conversion cover emits white light with substantially uniform luminance. Therefore, white light with substantially uniform brightness is emitted from the globe.
Japanese Patent Laying-Open No. 2004-127687 (page 3, FIG. 2) JP 2006-156187 A (page 9-10, FIGS. 12-13)

  Since the LED light bulb of Patent Document 2 includes a wavelength conversion cover provided with a phosphor on the front side of the light emitting diode, the configuration in the globe is complicated, and the manufacturing cost is increased, and the wavelength conversion cover itself Also has the disadvantage of becoming expensive.

  An object of the present invention is to provide an LED bulb that can obtain a substantially uniform luminance simply and a lighting fixture including the LED bulb.

  The invention of the LED bulb according to claim 1 includes: a light emitting diode mounted on a substrate; a lighting device for lighting the light emitting diode; and the lighting device is housed, and a base is mounted on one side, and the light source is mounted on the other side. A cover to which a substrate is attached; a light-transmitting glove attached to the other side of the cover so as to cover the light emitting diode; And a diffusion sheet sandwiched between the end portions of the globe.

  In the present invention and each of the following inventions, each configuration is as follows unless otherwise specified.

  One light emitting diode may be mounted on the substrate, or a plurality of light emitting diodes may be mounted.

The diffusion sheet is formed by mixing light diffusing fine particles such as titanium oxide (TiO ₂ ) and silica (SiO ₂ ) into a synthetic resin, for example, a polyamide resin material, and kneading. The thickness may be appropriately set according to the degree to which the emitted light from the light emitting diode is diffused by the globe.

  The globe may be formed of any synthetic resin such as glass or plastic.

  Since the edge of the diffusion sheet is sandwiched between the cover and the end of the globe, the diffusion sheet can prevent the fragments from scattering when the globe is damaged.

  According to the present invention, the light emitted from the light emitting diode enters the globe and is diffused by the diffusion sheet. By this light diffusion, substantially the entire area of the outer surface of the globe is brightened, and a substantially uniform brightness is obtained with the globe. The diffused light is emitted from substantially the entire outer surface of the globe to the outer side of the globe.

  Then, the edge of the diffusion sheet is sandwiched between the cover and the end of the globe, and the diffusion sheet is attached to the entire outer surface of the globe. Since it is not exposed to the outside, a substantially uniform luminance can be obtained without impairing the appearance.

  According to a second aspect of the present invention, in the LED light bulb according to the first aspect, a plurality of light emitting diodes are mounted on a substrate, and the cover is made of a heat conductive metal.

  For example, aluminum (Al), copper (Cu), stainless steel (SUS), or the like can be used as the heat conductive metal. The cover can be formed by, for example, casting, forging, or cutting. In addition, the cover can be formed using ceramic, synthetic resin, or the like with good thermal conductivity. However, ceramic is expensive, and synthetic resin may be deteriorated due to heat deterioration due to heat from a plurality of light emitting diodes. The cover made of a heat conductive metal can effectively transfer heat from a plurality of light emitting diodes to dissipate it, and can be formed at a relatively low cost.

  According to the present invention, each light emitted from the plurality of light emitting diodes is diffused by the diffusion sheet. And the substantially whole area | region of a glove becomes bright with diffused light, and substantially uniform brightness | luminance is obtained with a glove. Diffused light emitted from a plurality of light emitting diodes and diffused by the diffusion sheet is emitted outward from the globe.

  The invention of the lighting fixture according to claim 3 comprises the LED bulb according to claim 1 or 2; and a fixture body in which a socket for a bulb to which the LED bulb is mounted is disposed. Features.

  ADVANTAGE OF THE INVENTION According to this invention, since the substantially whole region of the globe of a LED bulb is shining brightly, the lighting fixture with which a desired light distribution is easy to be obtained is provided.

  According to the first aspect of the present invention, since the LED bulb can obtain substantially uniform brightness with the globe, the illumination light emitted from the globe can make it difficult for the person to be dazzled or uncomfortable. The diffusion sheet is simply applied to substantially the entire outer surface of the globe, and the edge of the diffusion seed is not exposed to the outside, so that a substantially uniform brightness can be obtained without impairing the appearance. LED bulbs can be formed at low cost.

  According to the invention of claim 2, since the LED bulb includes a plurality of light emitting diodes, the light emitted from the globe that can obtain a substantially uniform luminance is less likely to cause glare and discomfort to the person and illuminates brightly. be able to.

  According to the invention of claim 3, since light is emitted from substantially the entire area of the globe of the LED bulb, it is possible to provide a lighting device with a desired light distribution that hardly gives glare or discomfort to a person.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

  FIG. 1 is a partially cutaway schematic cross-sectional view of an LED bulb showing a first embodiment of the present invention, and FIG. 2 is a schematic exploded front view of the LED bulb.

  In FIG. 1, an LED bulb 1 includes a light emitting diode 2, a lighting device 3, a cover 4, a globe 5, and a diffusion sheet 6.

  The light-emitting diodes 2 are, for example, a surface-mount type that emits visible light, and a plurality of, for example, five are mounted on the substrate 7. The substrate 7 is formed in a quadrangular shape, for example, with a glass epoxy material or a paper phenol material, and a plurality of light emitting diodes 2 are mounted symmetrically at the center.

  The lighting device 3 is composed of a lighting circuit component (not shown) for lighting the light emitting diode 2, and is configured to convert an AC voltage, for example, 100 V into a DC voltage, for example, 24 V, and supply the converted voltage to the light emitting diode 2.

  The cover 4 is made of, for example, aluminum (Al) so as to have heat conductivity, a cylindrical base attaching portion (not shown) is formed on one side, and an annular cover portion 9 that is expanded on the other side is formed. Has been. A base 10 such as an Edison type E26 is attached to the base mounting portion. In the base 10, lead wires (not shown) drawn from the lighting device 3 are connected to the shell portion 10 a and the eyelet portion 10 b.

  A substantially disk-shaped base 11 having a predetermined thickness is fixed to the opening 9A of the cover portion 9 with a heat conductive adhesive or the like. The base 11 is made of, for example, aluminum (Al) so as to have heat conductivity, the substrate 7 is attached to the front surface 11a facing the opening of the cover 4, and the lighting device 3 is attached to the rear surface 11b. The lighting device 3 is accommodated in the cover portion 9 of the cover 4.

  Since the cover 4 and the base 11 are each formed of heat conductive aluminum (Al), for example, the heat generated by the lighting of the light emitting diode 2 is transferred from the substrate 7 to the base 11 and from the base 11 to the cover 4. Each of them is quickly transferred and radiated from the cover 4. Thereby, the temperature rise and temperature unevenness of the substrate 7 and the light emitting diode 2 are prevented. That is, the cover 4 and the base 11 are each formed of a heat conductive metal so that a plurality of light emitting diodes 2 are disposed on the substrate 7.

  The globe 5 has translucency and is formed in a substantially hemispherical shape having an opening 12 in the end portion 5a, for example, by a material such as transparent glass or synthetic resin. And the edge part 5a is fitted inside the cover part 9 of the cover 4, for example, is attached by the adhesive fixation by adhesives, such as a silicone resin and an epoxy resin. Accordingly, the plurality of light emitting diodes 2 are located in the opening 12 of the globe 5 and are covered with the globe 5.

The diffusion sheet 6 is formed by mixing light diffusing fine particles such as titanium oxide (TiO ₂ ) and silica (SiO ₂ ) into, for example, a polyamide resin material and kneading. And thickness is formed in 0.05-0.2 mm, for example.

  As shown in FIG. 2, the diffusion sheet 6 is attached to the globe 5 before the globe 5 is attached to the cover 4. That is, the diffusion sheet 6 formed so as to be able to be adhered to the entire outer surface 5b of the globe 5 is covered so as to cover the outer surface 5b. Then, hot air having a predetermined temperature and a predetermined pressure is blown from the top 5c side of the globe 5 to the end 5a side so as to go around the globe 5. Thereby, the diffusion sheet 6 is heat-shrinked and adheres to the outer surface 5 b of the globe 5. At this time, processing is performed so that the diffusion sheet 6 does not form wrinkles or the like on the outer surface 5 b of the globe 5 and the edge portion 6 a of the diffusion sheet 6 is positioned at the end portion 5 a of the globe 5.

  The globe 5 with the diffusion sheet 6 attached is fitted inside the cover portion 9 of the cover 4 and attached with an adhesive. At this time, as shown in FIG. 1, the end edge 6a of the diffusion sheet 6 is sandwiched between the cover 9 and the globe end 5a so as not to be exposed to the outside.

  Next, the operation of the first embodiment of the present invention will be described.

  When the base 10 is fed, the lighting device 3 operates and a DC voltage, for example, 24V is output. The DC voltage is applied to the plurality of light emitting diodes 2 mounted on the substrate 7, the light emitting diode 2 is turned on, and visible light, for example, white light is emitted from the light emitting diode 2.

Visible light emitted from the light emitting diode 2 enters the translucent globe 5, passes through the globe 5, and enters the diffusion sheet 6. Part of the visible light incident on the diffusion sheet 6 passes through the diffusion sheet 6 and is emitted outward. In addition, among visible light incident on the diffusion sheet 6, visible light that hits light diffusing fine particles such as titanium oxide (TiO ₂ ) and silica (SiO ₂ ) is irregularly reflected by the fine particles. Here, the diffusion sheet 6 is attached so as to be in close contact with the outer surface 5 a of the globe 5, and the shape thereof is substantially hemispherical, so that the irregular reflection visible light is reflected on the outer surface 5 a of the globe 5. Reflected to almost the entire area. Thus, visible light emitted from the plurality of light emitting diodes 2 is diffused on the outer surface 5 a side of the globe 5. When the glove 5 is visually recognized from the outside, the substantially entire area of the outer surface 5a of the glove 5 appears bright, and the entire area appears to shine. Thereby, substantially uniform brightness is obtained by the globe 5. Then, the diffused light is emitted outward from the substantially entire region side of the outer surface 5 a of the globe 5.

  Thus, since the substantially uniform brightness | luminance is acquired with the globe 5, the emitted light from the light emitting diode 2 radiate | emitted from the globe 5 side can make it hard to give a person glare and discomfort. Since the plurality of light emitting diodes 2 are provided, the total luminous flux of the radiated light from the light emitting diodes 2 is increased, and the light emitted from the globe 5 can be illuminated brightly.

  And since it is the simple structure which adhere | attaches the diffusion sheet 6 in the substantially whole region of the outer surface 5a of the globe 5 in order to obtain substantially uniform brightness | luminance with the globe 5, the LED bulb 1 can be formed cheaply.

  In addition, since the edge 6a of the diffusion sheet 6 is sandwiched between the cover 9 of the cover 4 and the end 5a of the globe 5, the appearance is good due to the sense of unity between the diffusion sheet 6 and the globe 5. It is possible to provide the LED bulb 1 with improved performance. Moreover, it becomes difficult for the diffusion sheet 6 to peel from the outer surface 5a of the globe 5, and it is possible to prevent the fragments from scattering when the globe 5 is damaged by dropping or the like.

  Next, a second embodiment of the present invention will be described.

  FIG. 3 is a partially cutaway schematic cross-sectional view of an LED bulb showing a second embodiment of the present invention, and FIG. 4 is a schematic exploded front view of the LED bulb. Note that the same parts as those in FIG.

  The LED light bulb 13 shown in FIG. 3 has two diffusion sheets 14 and 15 attached to the outer surface 5a of the globe 5 in place of the diffusion sheet 6 in the LED light bulb 1 shown in FIG. 14 a and 15 a are sandwiched between the cover portion 9 of the cover 4 and the end portion 5 a of the globe 5.

  As shown in FIG. 4, the diffusion sheets 14 and 15 are overlapped and attached to the globe 5 before the globe 5 is attached to the cover 4. Hereinafter, as described in FIG. The diffusion sheets 14 and 15 may be of the same type or different types. Moreover, even if it is the same kind, thickness may be the same and mutually different thickness may be sufficient. Here, the types refer to those in which the type and amount of light diffusing material, the type of synthetic resin into which the light diffusing material is mixed, and the like are different.

  When the two diffusion sheets 14 and 15 are attached to the outer surface 5a of the globe 5, the brightness at the globe 5 is lowered, and the light beam emitted from the globe 5 is lowered.

  In this way, brightness adjustment with the globe 5 can be flexibly performed by a simple configuration in which the thickness, quantity, or type of the diffusion sheet is selected according to the type of the light emitting diode 2.

  Next, a third embodiment of the present invention will be described.

  FIG. 5 is a partially cutaway schematic front view of a lighting fixture showing a third embodiment of the present invention, and FIG. 6 is a partially cutaway schematic front view of another lighting fixture. Note that the same parts as those in FIG.

  The lighting fixture 16 shown in FIG. 5 is a hanging type lighting fixture that is suspended from a ceiling 17, and a bulb socket 19 to which the base 10 of the LED bulb 1 is attached to a fixture main body 18 having a bottomed outer shape. It is arranged. The instrument body 19 is connected to a power cord 21 having a hooking sealing cap 20 at the tip.

  The hook sealing cap 20 is attached to a hook ceiling body 22 disposed on the ceiling 17. As a result, external power is supplied to the socket 19 for the light bulb via the power cord 21 and the like. The hook sealing cap 20 and the hook sealing body 22 are covered with a sealing cover 23. The LED bulb 1 is attached to a bulb socket 19.

  The LED bulb 1 is turned on in response to an on / off operation of a wall switch (not shown). And since the glove 5 whole seems to be shining, it can illuminate without giving a person glare and discomfort.

  Moreover, the lighting fixture 24 shown in FIG. 6 is a downlight embedded in the ceiling 17, and a bulb socket 26 to which the LED bulb 1 is attached is disposed on a cylindrical fixture body 25 whose outer shape is a bottom. Yes. The instrument body 25 is fixed to the ceiling 17 with the ceiling 17 sandwiched between a cover body 27 and leaf springs 28, 28 provided integrally with the instrument body 25. The LED bulb 1 is attached to the socket 26 for the bulb.

  The emitted light from the LED bulb 1 becomes direct light and reflected light reflected by the inner surface of the instrument body 25 and is emitted from the opening 29 of the cover body 27 to the lower surface side.

  Since the LED bulb 1 can obtain uniform brightness with the globe 5 and emits radiated light from substantially the entire area of the globe 5, the lighting fixture 24 illuminates with a desired light distribution that hardly causes glare or discomfort to humans. be able to.

1 is a partially cutaway schematic cross-sectional view of an LED bulb showing a first embodiment of the present invention. Similarly, a schematic exploded front view of an LED bulb. The partial notch schematic sectional drawing of the LED bulb which shows the 2nd Embodiment of this invention. Similarly, a schematic exploded front view of an LED bulb. The partial notch schematic front view of the lighting fixture which shows the 3rd Embodiment of this invention. Similarly, the partially cut away schematic front view of another lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,13 ... LED bulb 2 ... Light emitting diode 3 ... Lighting device 4 ... Cover 5 ... Globe 6, 14, 15 ... Diffusion sheet 16, 24 ... Lighting fixture 18, 25 ... Main body of fixture

Claims (3)

A light emitting diode mounted on a substrate;
A lighting device for lighting the light emitting diode;
A cover in which the lighting device is accommodated, a base is mounted on one side, and the substrate is mounted on the other side;
A translucent glove attached to the other side of the cover to cover the light emitting diode;
A diffusion sheet that is deposited over substantially the entire outer surface of the globe and whose edge is sandwiched between the cover and the end of the globe;
LED bulb characterized by comprising.   The LED light bulb according to claim 1, wherein a plurality of light emitting diodes are mounted on a substrate, and the cover is made of a heat conductive metal. An LED bulb according to claim 1 or 2;
An instrument body having a light bulb socket to which the LED light bulb is mounted;
The lighting fixture characterized by comprising.

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