JP5279755B2 - Light emitting device and wavelength conversion member - Google Patents

Description

  The present invention relates to a light emitting device and a wavelength conversion member. The present invention particularly relates to a light bulb-type light emitting device (illuminating device) using a light emitting diode (LED).

  In recent years, with the increase in brightness of LEDs, white LEDs have come to be widely used as lighting, and those that can also be used as household lighting are appearing. As a lighting device for home use of this kind, it is desirable that the lighting color can be changed in real time according to the personal preference and necessity according to the living space.

  Conventionally, this type of lighting device generally has many lamps that emit one specified light color, and does not have a function of freely changing the color tone and luminance. In addition, due to the characteristics of the LED, since it has a long life, it will continue to use a certain light color for a long time.

  As a lighting device designed to change the color tone, LEDs of different red, green, and blue light colors are mounted, a means for controlling the current value is attached to the LED bulb, and the currents of the LEDs of different light colors Some change the color by controlling the value with a remote control or buttons. In addition, a light emitting color variable body consisting of a plate coated with a luminescent paint on the surface, a detachable opening provided on the glove, and a light emitting diode emitting ultraviolet light are used to replace the plate coated with several types of fluorescent paint. Thus, there is one that changes the color (for example, see Patent Document 1).

JP 2005-222750 A

  In the lighting device that controls the current value of the LED with a remote controller or a button as described above, a plurality of light color LEDs must be mounted in order to obtain a target light color, and the control of the lighting pattern becomes complicated. The device itself is also expensive. Moreover, in the illuminating device which replaces | exchanges a plate from the opening provided in the globe as mentioned above, there existed a subject that the original function of the globe which diffuses the light from LED was impaired.

  An object of the present invention is, for example, to convert a luminescent color by a simple operation without replacing an LED or impairing the function of a globe in a light emitting device using the LED.

A light emitting device according to one embodiment of the present invention includes:
A base having a base on one of the top surface and the bottom surface, an opening on the other, and a slit on the side surface;
An LED housed in the base and emitting light to the opening by being fed from an external power source through the base;
A glove attached to the base to cover the opening and diffusing the light;
A wavelength conversion member that is detachably inserted from the slit between the opening and the LED and converts the wavelength of the light is provided.

  According to one aspect of the present invention, in the light emitting device, the wavelength converting member is attached to and detached from the slit provided on the side surface of the base between the opening on the top surface or the bottom surface of the base and the LED accommodated in the base. Since it is freely inserted, it is possible to convert the light emission color by a simple operation without replacing the LED or impairing the function of the globe.

1 is a perspective view of a light emitting device according to Embodiment 1. FIG. 3 is a perspective view of a glove, a color conversion member, and other parts of the light emitting device according to Embodiment 1. FIG. 2A is a top view of a color conversion member according to Embodiment 1, and FIG. 3B is a side view of a color conversion sheet.

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

Embodiment 1 FIG.
FIG. 1 is a perspective view of a light emitting device 100 according to the present embodiment. 2 is a perspective view of the globe 110, the color conversion member 160 (an example of a wavelength conversion member), and other parts of the light emitting device 100 shown in FIG.

  1 and 2, a light emitting device 100 is equipped with an LED 121 serving as a light source, an LED mounting substrate 120, a glove 110 (milky white cover) made of a milky white resin having a diffusion effect, and a glove 110. Heat sink 130 (an example of a base) and a detachable color conversion member 160 are provided. A base 140 is attached to the heat sink 130. Further, the heat sink 130 is provided with a slit 150 into which the color conversion member 160 or the frame 170 is inserted. The color conversion member 160 includes a sheet fixing part 161 and a color conversion sheet 162 (an example of a sheet).

  The heat sink 130 has a base 140 on the bottom surface (or top surface) and an opening 131 on the top surface (bottom surface when the base 140 is on the top surface). A slit 150 is provided on a side surface of the heat sink 130. Since the LED 121 generates heat toward the LED mounting substrate 120, the heat is released by the heat sink 130. Instead of using the heat sink 130 as a base for housing the LED 121 in this way, a means for radiating the heat of the LED 121 may be provided in a portion other than the base.

  The LED 121 is accommodated in the heat sink 130. The LED 121 emits light to the opening 131 by being fed from an external power source via the base 140. The LED 121 is a white LED having a color temperature of 5000 to 6500 K (Kelvin), for example, and is an SMD (Surface, Mount, Device) type LED in FIG. 1, but may be a bullet-type LED. The LED 121 has a configuration of a general white LED, and is provided with a blue LED and a highly transparent phosphor-containing resin layer so as to cover the blue LED, and is surrounded by a package made of a resin such as ceramics. The blue LED is electrically connected by a gold wire, and emits light by electric power supplied from the electrode. The phosphor mixed in the phosphor-containing resin layer is, for example, a YAG (yttrium, aluminum, garnet) phosphor, excited by light emitted from a blue LED, and having a spectrum between 480 and 780 nm (nanometers), It emits light having a dominant wavelength around 560 nm. Since the dominant wavelength of the light emitted from the blue LED and the dominant wavelength of the light emitted from the phosphor are in a complementary color relationship, these combined lights exhibit a pseudo white color. The material of the phosphor-containing resin layer is an epoxy resin or a silicone resin. Since the light flux of the LED element is reduced by heat, it is preferable to use a silicone resin that is excellent in heat resistance, chemical resistance, self-lubricating property, and friction resistance and is extremely stable as compared with an epoxy resin.

  The LED mounting board 120 is housed in the heat sink 130 together with the LEDs 121. A circuit pattern (electric circuit) for lighting the LED 121 is printed on the LED mounting substrate 120, and the LED 121 is mounted thereon. The base material of the LED mounting substrate 120 is, for example, aluminum, paper phenol, glass epoxy, or the like. When a material having high thermal conductivity such as aluminum is used, heat generated when the LED 121 emits light can be released, and a decrease in luminous flux due to heat of the LED 121 can be prevented. Therefore, it is preferable to use such a material. .

  The globe 110 is attached to the heat sink 130 so as to cover the opening 131. For example, the globe 110 is fixed to the heat sink 130 by bonding. Thereby, the LED mounting substrate 120 and the LED 121 are not exposed, and safety is ensured. When the frame 170 is inserted into the slit 150, that is, when the color conversion member 160 is removed, the globe 110 directly diffuses the light emitted from the LED 121 and emits the light to the outside. On the other hand, the globe 110 diffuses light emitted from the LED 121 and converted in color by the color conversion member 160 in a state where the color conversion member 160 is inserted into the slit 150, that is, in a state where the color conversion member 160 is attached. And output to the outside. A material used for the globe 110 is, for example, a milky-colored acrylic plate formed by injecting a liquid monomer between two pieces of glass. By using such a material, the color mixing property of the light emitted from the LED 121 and the light whose wavelength is converted by the color conversion member 160 can be improved.

  The color conversion member 160 is detachably inserted from the slit 150 between the opening 131 and the LED 121. The color conversion member 160 converts the wavelength of light emitted from the LED 121.

  FIG. 3A is a top view of the color conversion member 160. FIG. 3B is a side view of the color conversion sheet 162.

  3A and 3B, the color conversion member 160 includes a color conversion sheet 162 that converts the wavelength of light emitted (radiated) from the LED 121, and a sheet fixing unit 161 that fixes the color conversion sheet 162. (Seat fixing frame) and a structure that can be slid and fixed to the slit 150. Light emitted from the LED 121 and passing through the color conversion sheet 162 passes through the globe 110 having a diffusing effect, so that well-mixed light can be obtained. The sheet fixing portion 161 is configured such that the entire outer periphery is smaller than the circumference of the opening 131 and is sufficiently contained within the heat sink 130. The sheet fixing portion 161 is made of, for example, a transparent or white resin having a diffusion effect.

  The sheet fixing portion 161 is provided with a hole 163 in which the color conversion sheet 162 is fixed. The hole 163 is provided at a position corresponding to the position where the LED 121 is accommodated in the heat sink 130. That is, the hole 163 is provided for each LED 121. As described above, the sheet fixing portion 161 has the hole 163 at a position directly above the light emitting portion of the LED 121, and the color conversion sheet 162 is attached only to the hole 163 portion. Therefore, the color conversion sheet 162 can be used for the necessary area, and the amount of expensive materials such as phosphors can be reduced. Therefore, illumination capable of color conversion can be obtained at low cost. As shown in FIG. 1, almost all of the light emitted from the LEDs 121 is placed in a frame 170 (attached instead of the color conversion member 160) that is inserted into the slit 150 when the color conversion member 160 is removed. A hole 171 of a size that can be passed is provided. Therefore, when the frame 170 is used, the LED 121 can be used in the same color.

  In addition, the sheet fixing portion 161 has a shape in which the end portion 166 can be fitted into the slit 150. As shown in FIG. 3A, the sheet fixing portion 161 has a shape in which a part of the circle (left side portion in the drawing) is missing, has a width that can be inserted into the slit 150, and It is formed to have a groove 167 that is hooked to the end of the slit 150. By adopting such a shape, the color conversion member 160 can be inserted into the slit 150, and the outer periphery of the entire sheet fixing portion 161 can be prevented from becoming too small compared to the inner periphery of the heat sink 130 ( If it is too small, the color conversion member 160 will be easily removed, and it will not be possible to deal with the case where the LEDs 121 are arranged in a wide range). Furthermore, by providing the groove 167, the end portion 166 of the sheet fixing portion 161 can be hooked on the end of the slit 150, so that the color conversion member 160 is difficult to come off. An outer frame 164 that can be pinched by hand when the color conversion member 160 is inserted into or removed from the slit 150 is provided at the end 166 of the sheet fixing portion 161. In a state where the color conversion member 160 is attached, only the outer frame 164 protrudes to the outside of the heat sink 130. The outer frame 164 itself may have a shape that can be fitted into the slit 150. That is, the outer frame 164 may be fitted into the slit 150 so as not to protrude outside the heat sink 130. Note that the frame 170 also has an end that can be fitted into the slit 150 in the same manner as the sheet fixing portion 161. That is, the frame 170 also has a shape in which a part of the circle is missing, has a width that can be inserted into the slit 150, and is formed to have a groove that is hooked on the end of the slit 150. And As shown in FIG. 1, an outer frame 172 that can be pinched by hand when the frame 170 is inserted into or removed from the slit 150 is provided at the end of the frame 170. It is assumed that For example, a concave portion may be provided at the end portion 166 of the sheet fixing portion 161 and the end portion of the frame 170 so as to be inserted into the slit 150 and fixed. The slit 150 may be provided with a convex portion that can be fitted into the concave portion. In this case, the sheet fixing portion 161 and the frame 170 are fitted into the slit 150 by fitting the convex portion provided in the slit 150 into the concave portion provided in the end portion 166 of the sheet fixing portion 161 and the end portion of the frame 170. Can be fixed. On the contrary, a convex portion may be provided at the end portion 166 of the sheet fixing portion 161 or the end portion of the frame 170, and a concave portion may be provided in the slit 150. Or you may employ | adopt the combination of the shape which can be fitted different from this. In addition, the end portion 166 of the sheet fixing portion 161 and the end portion of the frame 170 are not limited to the grooves and the outer frame, but may be pulled from the outside so that the color conversion member 160 and the frame 170 can be easily removed. A protrusion, groove, or the like that can be hooked may be provided.

  The color conversion sheet 162 preferably has an area that sufficiently covers the light emitting portion of the LED 121. The slit 150 is preferably provided immediately above the light emitting portion of the LED 121 or at a position within at least 2 mm (millimeters). If the slit 150 is provided in the vicinity of the LED 121, a sufficient size, that is, a sufficient area of the color conversion sheet 162 can be secured even if the hole 163 of the sheet fixing portion 161 is reduced.

  The color conversion sheet 162 preferably has a configuration in which an antireflection film 165 is pasted on both sides (or one side). Alternatively, the color conversion sheet 162 preferably has a configuration in which a low refractive index sheet is pasted on both sides (or one side). That is, the color conversion sheet 162 is preferably coated on one or both sides with an antireflection film 165 or a low refractive index film. Since light is reflected at the interface between different materials and depending on the angle of incidence, a thin film with a quarter wavelength of light can be applied to reduce reflection and efficiently transmit the light emitted from the LED 121. Efficient color conversion. That is, by attaching an antireflection film 165 or a low refractive index sheet to the color conversion sheet 162, light that does not pass through the color conversion sheet 162 can be reduced, and color conversion can be performed with high efficiency. .

  The color conversion material contained in the color conversion sheet 162 is a phosphor or an organic pigment, and varies depending on the intended light color. It is desirable that the color conversion material is uniformly dispersed in the color conversion sheet 162. For example, when white light having a color temperature lower than that of the LED 121 is set to a target color temperature, it is preferable to use a phosphor for the color conversion member. Since the light of the LED 121 is absorbed and light having a wavelength longer than that of the LED 121 is emitted, the light conversion efficiency can be increased as compared with the pigment. Further, when a special illumination color such as blue or red is set to a target color temperature, a pigment pigment such as an organic pigment is used as the color conversion material.

  As described above, in the present embodiment, in a light bulb-type light emitting device (light bulb-type LED lamp) using the LED 121, color conversion can be performed according to preference and necessity at a low cost, with simple work, and high efficiency. An illumination device that can perform color conversion can be obtained. In particular, in the present embodiment, the color conversion member 160 is detachably inserted from the slit 150 provided on the side surface of the heat sink 130 between the opening of the heat sink 130 and the LED 121 accommodated in the heat sink 130. Therefore, the function of the globe 110 is not impaired. That is, according to the present embodiment, it is possible to convert the emission color with a simple operation without replacing the LED 121 and without impairing the function of the globe 110.

  In the present embodiment, the light emitting device 100 is a light bulb type LED lamp, but may be another type of LED lamp. At this time, the light emitting device 100 is a base having a base 140 at least on the bottom surface (or top surface) and an opening 131 on the top surface (bottom surface when the base 140 is on the top surface), and having a slit 150 on the side surface. Is provided. In this slit 150, at least the color conversion member 160 is detachably inserted between the opening 131 and the LED 121 accommodated in the base.

  Further, in the present embodiment, the slit 150 is provided on the side surface of the heat sink 130, but the slit 150 may be provided in the globe 110 instead of or in addition thereto.

  As an application example of the present embodiment, an illumination device using a light bulb type LED can be considered.

  100 light emitting device, 110 globe, 120 LED mounting board, 121 LED, 130 heat sink, 131 opening, 140 base, 150 slit, 160 color conversion member, 161 sheet fixing part, 162 color conversion sheet, 163 hole, 164 outer frame, 165 Antireflection film, 166 end, 167 groove, 170 frame, 171 hole, 172 outer frame.

Claims (7)

A base having a base on one of the top surface and the bottom surface, an opening on the other, and a slit on the side surface;
An LED (light emitting diode) that is housed in the base and emits light to the opening by being fed from an external power source through the base;
A glove attached to the base to cover the opening and diffusing the light;
A wavelength conversion member to be inserted removably between the LED and the opening from the slit, the sheet to convert the wavelength of the light, the sheet fixed portion hole the sheet is fixed is provided And a wavelength conversion member having an outer frame attached to an end portion of the sheet fixing portion ,
In a state where the wavelength conversion member is inserted into the slit and attached to the base, the end of the sheet fixing portion is fitted into the slit, and only the outer frame protrudes to the outside of the base. A light-emitting device. A part of the end of the sheet fixing part is cut away so that the sheet fixing part has a width that can be inserted into the slit, and the wavelength conversion member is inserted into the slit and attached to the base. 2. The light emitting device according to claim 1, wherein in the state, the notched portion of the end portion of the sheet fixing portion is hooked on the end of the slit. The sheet fixing unit at a position corresponding to the position where the LED is accommodated in the base, the light emitting device according to claim 1 or 2, wherein the hole is provided. The light emitting device according to any one of claims 1 to 3, wherein the sheet is coated on one side or both sides with an antireflection film. The light emitting device according to any one of claims 1 to 3, wherein the sheet is coated on one or both sides with a low refractive index film.   The light emitting device according to claim 1, wherein the base is a heat sink that dissipates heat of the LED. A base having a base on one of the upper surface and the bottom and an opening on the other side, and a slit provided on the side, and a light received in the opening by being supplied from the external power source through the base. and LED (light emitting diode) that emits, attached to the base so as to cover the opening, used in the light emitting device and a globe for diffusing the light, between the LED and the opening from the slit a wavelength conversion member to be inserted detachably in mounted a seat for converting the wavelength of the light, and the seat fixing portion with a hole provided in which the sheet is fixed, at an end portion of the sheet fixed portion An outer frame,
In the state of being inserted into the slit and attached to the base, the end portion of the sheet fixing portion is fitted into the slit, and only the outer frame protrudes to the outside of the base. Wavelength conversion member.

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