JP4986735B2 - Light source for illumination - Google Patents

Description

  The present invention relates to an efficient illumination light source that emits light emitted from a light emitting element in all directions.

  In recent years, there is a movement to use a light emitting device using a semiconductor light emitting element such as a light emitting diode (LED) for illumination.

  As shown in FIG. 10, the conventional light emitting device has a mounting portion 11 a for placing the light emitting element 15 at the center of the upper main surface, and includes a base 11 made of an insulator and an upper main surface of the base 11. A through-hole 12a is formed in which the upper opening is larger than the lower opening, and the inner peripheral surface of the through-hole 12a is a reflective surface that reflects light emitted from the light emitting element 15. The light-emitting device that is mainly composed of the reflective member 12 and reflects the light emitted from the back surface facing the front surface on which the electrode of the light-emitting element is formed, reflected by the inner peripheral surface of the frame body, and condensed and emitted on the upper surface side (For example, refer to Patent Document 1).

  Light is emitted in all directions from the light emitting layer of the light emitting element, but in the light emitting device of FIG. 10, light emitted from the back side of the light emitting element is mainly used and emitted to the upper surface side of the light emitting device. Yes. In addition, in order to utilize light emitted from the surface side of the light emitting element as much as possible, a metal reflective film or the like is formed on the surface side of the light emitting element together with the electrodes.

  Further, as a conventional light emitting device using light radiated from the surface side of the light emitting element 15, as shown in FIG. 11, a first electrode 17 is formed around the light emitting surface (front surface) side of the light emitting element 15. Is mounted on the surface of the transparent substrate 19 on which the circuit conductor layer 18 is formed, and the second electrode 20 provided on the back surface side is connected to a predetermined position of the circuit conductor layer 18 by a metal wire 21 (for example, a patent Reference 2).

Furthermore, as a light emitting device in which light is emitted from both the front and back sides of the light emitting device, for example, as shown in FIG. 12, a predetermined pattern in which Ni or P and Au are plated on ITO or ITO surface on a glass substrate 22b The metallized film 23 is formed, the light-emitting element 15 is mounted via a conductive adhesive, and then a glass substrate 22a on which another metallized film 23 is formed is covered. (For example, refer to Patent Document 3).
JP 2005-183727 A JP-A-3-233978 Japanese Patent Laid-Open No. 3-290982

  However, in the conventional light emitting device disclosed in Patent Document 1, the light emitted from the light emitting element 15 is directly irradiated upward from the back side of the light emitting element 15, the metal reflective film of the light emitting element 15, and the reflective member. 12 and what is reflected by the substrate 11 are irradiated upward, and part of the light reflected by the metal reflecting film, the reflecting member 12 and the substrate 11 is absorbed, resulting in poor luminous efficiency. There was a problem.

  The conventional light emitting device disclosed in Patent Document 2 also has a problem in that a part of light is absorbed by the second electrode on the back surface side and the light emission efficiency is deteriorated.

  In the conventional light emitting device disclosed in Patent Document 3, light is emitted in all directions from both the front and back surfaces, but light is attenuated by the conductive adhesive and the metallized film 23 on both the front and back surfaces of the light emitting element. There was a problem. Further, the structure is insufficient for emitting uniform light around the entire circumference of the light emitting device.

  Accordingly, the present invention has been completed in view of the above-mentioned conventional problems, and the object thereof is to efficiently utilize light while minimizing the loss of light energy emitted from the light emitting element in all directions, and to make light in all directions. An object of the present invention is to provide an illumination light source that can emit uniform light.

The illumination light source of the present invention has a first translucent member that has a wiring conductor and transmits light, and has a front surface and a rear surface that are parallel to the light emitting layer, and electrodes provided on the front surface are connected to the wiring conductor. sealing a light emitting element, said back surface and said light emitting element has covering both the front and back surfaces of the first transparent member and said first light-transmissive member of the light emitting element for emitting light from the surface and the back surface is And a pair of lead terminals provided on the first light transmissive member so as to be symmetrical on both sides of the light emitting element. It is characterized by.

  In the illumination light source according to the present invention, preferably, the first light transmissive member is made of glass or sapphire.

  In the illumination light source of the present invention, preferably, the translucent member is made of a silicone resin or an epoxy resin.

  In the illumination light source of the present invention, preferably, the wiring conductor is transparent.

In the illumination light source of the present invention, preferably, the second translucent member has a surface substantially orthogonal to the light emitted from the light emitting layer of the light emitting element. with curved surfaces are provided on a surface, the second light transmitting member, characterized that you have been formed in a spherical shape centering on the light emitting element arranged in the point source.

  In the illumination light source of the present invention, preferably, the second light transmissive member contains a phosphor.

  In the illumination light source of the present invention, preferably, the second light transmissive member is covered with a third light transmissive member containing a phosphor.

  The illumination light source of the present invention is preferably characterized by having light diffusing means for diffusing light around the illumination light source of the present invention.

  The illumination light source of the present invention is preferably characterized in that a gap is provided between the illumination light source of the present invention and the light diffusion means.

The illumination light source of the present invention has a first translucent member that has a wiring conductor and transmits light, a front surface and a rear surface that are parallel to the light emitting layer, and electrodes provided on the front surface are connected to the wiring conductor. sealing a light emitting element, said back surface and said light emitting element has covering both the front and back surfaces of the first transparent member and said first light-transmissive member of the light emitting element for emitting light from the surface and the back surface Te A second translucent member and a pair of lead terminals provided on the first translucent member so as to be symmetrical on both sides of the light-emitting element, which are linear wires. The light emitted from the surface side of the light emitting element can also be transmitted through the first light transmissive member and the second light transmissive member, so that the light emitted in all directions from the front and back surfaces of the light emitting element is used for illumination. it is possible to use as an irradiation light source, Can be mode pin is hardly intercept as much as possible the light emitted from the light emitting element.

  In the illumination light source of the present invention, preferably, the first light transmissive member is made of glass or sapphire, so that the light transmissive member is excellent in light transmittance, and attenuation of light irradiated from the light emitting element and transmitted through the first light transmissive member. Can be reduced. Further, glass or sapphire can have high thermal conductivity and excellent heat dissipation from the light emitting element.

  In the illumination light source of the present invention, preferably, the second translucent member is made of a silicone resin or an epoxy resin, so that the light emitted from the light emitting element is transmitted to transmit light from both the front and back surfaces of the illumination light source in all directions. Can be irradiated.

  In the illumination light source of the present invention, preferably, the wiring conductor is transparent, so that the light absorbed by the wiring conductor can be reduced.

  In the illumination light source of the present invention, preferably, the surface of the second light transmissive member has a curved surface so that the surface of the second light transmissive member is substantially orthogonal to the light emitted from the light emitting layer of the light emitting element. Since it is provided, the emitted light from the light emitting element that is totally reflected by the surface of the second light transmissive member is reduced, and the light is easily transmitted to the outside through the surface of the second light transmissive member. .

  In the illumination light source of the present invention, preferably, since the second translucent member contains a phosphor, the light irradiated from the light emitting element can be wavelength-converted into desired light by the phosphor, An illumination light source having a desired emission color can be provided.

  In the illumination light source of the present invention, preferably, since the second light transmissive member is covered with the third light transmissive member containing the phosphor, the light irradiated from the light emitting element is second light transmissive. A light source for illumination with high light emission intensity can be provided by taking out with the member and irradiating the third translucent member containing the phosphor.

  The illumination light source of the present invention preferably has a light diffusing means for diffusing light around the illumination light source, so that the light emitted from the illumination light source or the phosphor is diffused by the light diffusing means to the outside. Since light is emitted and light appears to be emitted from the wide surface of the light diffusing means, light emission does not appear to concentrate around the light emitting element, and glare can be reduced.

  In the illumination light source of the present invention, preferably, since a gap is provided between the illumination light source and the light diffusing means, a difference between the thermal expansion of the illumination light source and the thermal diffusion of the light diffusing means occurs. No thermal stress is applied to the illumination light source. In addition, the light emitting surface of the illumination light source becomes larger, and glare caused by the light emitting element having a small light emitting source and high luminance can be reduced. Moreover, the outer surface of the light source for illumination becomes large, and it can irradiate a wide range.

  The illumination light source of the present invention will be described in detail below. FIG. 1 is a perspective view showing an example of an embodiment of an illumination light source according to the present invention. FIG. 2 is a perspective view showing another example of an embodiment of an illumination light source according to the present invention. 9 is a cross-sectional view showing still another example of the embodiment of the illumination light source according to the present invention.

  In these drawings, 1 is a first light-transmissive member, 1a is a wiring conductor formed on the surface of the first light-transmissive member 1, 2 is a light emitting element, 2a is a light emitting layer inside the light emitting element 2, and 2b is light emitting. The electrode of the light emitting element 2 formed on the surface 2c side of the element 2, 4 is a second light transmissive member that covers the first light transmissive member 1 and the light emitting element 2, and 5 is a surface that covers the second light transmissive member. The third translucent member provided, 6 is the second translucent member 4 or the gap formed between the third translucent member 5 and the light diffusion means 7, and 7 is the second translucent member 4. Alternatively, it is a light diffusing unit that diffuses and transmits light emitted from the surface of the third light transmissive member 5.

  As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8, and 9, the illumination light source of the present invention is parallel to the first translucent member 1 having the wiring conductor 1a and the light emitting layer 2a. A light emitting element 2 having a front surface 2c and a back surface 2d, and an electrode 2b provided on the front surface 2c connected to the wiring conductor 1a and emitting light from the back surface 2d opposite to the front surface 2c and the surface 2c; A second translucent member that covers the back surface of the light emitting element 2 and the front and back surfaces of the first translucent member so as to surround them is provided.

  The 1st translucent member 1 in this invention consists of translucent materials, such as a glass substrate, a sapphire substrate, an epoxy resin, and an acrylic resin. The 1st translucent member 1 may scatter the light which permeate | transmits an inside, and may be transparent which permeate | transmits without scattering. Since the 1st translucent member can permeate | transmit the light emitted from the light emitting element 2, the light radiated | emitted toward the 1st translucent member 1 from the light emitting layer 2a of the light emitting element 2 is made into 1st translucent. The light can be transmitted through the opposite surface of the optical member 1. Preferably, it is better to be made of a light transmissive material such as glass or sapphire, which has better heat dissipation than a resin translucent member such as epoxy, and has a thermal expansion coefficient similar to that of the light emitting element 2. More preferably, a sapphire substrate with good light transmittance is preferable, and a transparent one is preferable.

  The wiring conductor 1a is made of a conductive material such as gold (Au), ITO (indium tin oxide), ZnO (zinc oxide) or the like, and the terminal of the wiring conductor 1a has copper (Cu), iron (Fe) -nickel (Ni ) A lead terminal 3 made of a metal such as an alloy is connected.

  The wiring conductor 1 a has a metallized layer containing, as a main component, a metal composed of, for example, tungsten (W), molybdenum (Mo) -manganese (Mn), or the like on the surface of the first translucent member 1. It is formed in a small area so as not to block the light emitted from the surface 2c as much as possible, and the surface is plated with gold (Au) having a high light reflectance, or Au, silver (Ag), aluminum having a high light reflectance. (Al), platinum (Pt), titanium (Ti), chromium (Cr), or an alloy thereof is vapor-deposited, or a translucent material such as ITO or ZnO is deposited on the surface of the first translucent member 1. It is formed using sputtering or vapor deposition. For the wiring conductor 1a, ITO or ZnO may be used so as not to block light from the light emitting element 2. Further, a gold (Au) layer is formed on the surface of the joint portion with the lead terminal 3, and the wiring conductor 1a and the lead terminal 3 are joined with gold (Au) -tin (Sn) or the like.

  For example, the lead terminals 3 are routed to one side of the first light-transmissive member 1 and are connected so as to be parallel to the ends thereof so as not to block the light of the light emitting element 2 as much as possible. In addition, as shown in the example of FIG. 5, as the lead terminal 3, a linear wire may be connected to both sides so as to sandwich the light emitting element 2, and bend in the middle so that the other ends are parallel to each other. Good. By doing in this way, the area of the wiring conductor 1a of the surface of the 1st translucent member 1 can be made as small as possible, and resistance value can be lowered | hung.

  As the light emitting element 2, an LED (Light Emitting Diode), a laser diode (LD), an electroluminescence (EL) element, or other solid light emitting element is used.

  A light-transmitting material such as ITO (indium tin oxide) or zinc oxide (ZnO) is used for the electrode 2b of the light-emitting element 2, and light irradiated from the light-emitting layer 2a of the light-emitting element 2 is irradiated with the surface 2c of the light-emitting element 2. , And can be emitted from the side surface and the back surface 2d. The light emitting element 2 does not form a reflective film or the like on the surfaces 2c and 2d, and the electrode 2b is also formed so as not to block the emitted light of the light emitting element 2 as much as possible.

  As a method of connecting the light emitting element 2 to the wiring conductor 1a, a flip chip bonding method in which the lower surface (surface 2c) electrode 2b of the light emitting element 2 is connected by an electric connecting means such as a metal ball or a solder bump is used. A method may be used in which the back surface 2d of the light emitting element 2 is bonded to the first translucent member 1 and the electrode 2 on the front surface 2c side and the wiring conductor 1a are connected by a bonding wire. The light is attenuated by the shadow.

  In the illumination light source of the present invention, as shown in FIGS. 2A and 2B, a plurality of light emitting elements 2 may be arranged on one surface of the first translucent substrate 1. Further, as shown in FIG. 2A, the light emitting elements 2 are preferably connected so that the same number connected in series are connected in parallel in a plurality of columns. By connecting the light emitting elements 2 in series, the current value flowing through each light emitting element 2 can be made the same, so that the failure of the light emitting elements 2 can be reduced. Further, by connecting the light emitting elements 2 connected in series to each other in parallel, the illumination light source does not stop at all even if one light emitting element 2 fails. By using the plurality of light emitting elements 2, the luminance of the illumination light source can be increased and the light emitting surface of the illumination light source can be widened, so that an illumination light source with less glare can be provided.

  Also, for example, if a plurality of light emitting elements 2 that emit red, green, and blue are mounted, a light source for illumination that emits white light can be obtained.

  In the illumination light source of the present invention, the first translucent member 1 and the light emitting element 2 are covered and sealed with the second translucent member 4. The second light transmissive member 4 is preferably sealed so as to cover the entire first light transmissive member 1 and the light emitting element 2 after the light emitting element 2 is mounted on the first light transmissive member 1. As a result, the sealing performance is improved, and uniform light can be easily irradiated from the entire circumference of the second translucent member 4.

  Moreover, it is preferable to make the thickness L of the 2nd translucent member 4 between the light emitting element 2 and the outer surface 4a of the 2nd translucent member 4 become substantially constant thickness. For example, as shown in FIG. 1 and FIG. 4, when one light emitting element 2 is arranged inside, the second light transmissive member 4 has one light emitting element 2 arranged like a point light source. A spherical shape surrounding the center is preferable. As a result, the optical path length L in the second translucent member 4 becomes constant, and the surface 4a of the second translucent member 4 becomes a curved surface substantially orthogonal to the light emitted from the light emitting element 2. The light from the light emitting element 2 is not totally reflected on the surface 4a of the second light transmissive member 4 due to the difference in refractive index between the second light transmissive member 4 and the outside air, and goes to the outside of the second light transmissive member 4. Irradiated. That is, the angle at which the light from the light emitting element 2 intersects the surface 4a of the second light transmissive member 4 is an angle within a range where the light is not totally reflected by the surface 4a of the second light transmissive member 4, It is preferable to provide a curved surface that does not have such a light collecting effect on the surface 4 a of the second light transmissive member 4.

  When a plurality of light emitting elements 2 are mounted on the first light transmissive member 1 and the mounting interval of the light emitting elements 2 is narrower than the thickness L of the second light transmissive member 4, FIG. As shown in FIG. 4, the surface 4a of the second light transmissive member 4 may be a curved surface in a range that does not impair the light extraction effect from the surface 4a. Preferably, when the mounting interval between the light emitting elements 2 is somewhat larger than the thickness L of the second light transmissive member 4, for example, as shown in FIGS. 2B and 3, the second light transmissive member is used. 4 may have a shape in which a plurality of spheres 4b having an optical path length L and a dome 4b having a curved surface substantially orthogonal to the optical path are connected. Groove-shaped notches are formed between the adjacent spheres 4b or dome 4b, respectively, and a large amount of light is transmitted from the wide surface 4a of the second translucent member 4 by forming these spheres 4b or dome 4b in the circumferential direction. Can be taken out. In FIG. 2B, a part of the first light transmissive member 1 is not covered with the second light transmissive member 4, but the first light transmissive member 1 is preferably covered by the second light transmissive member 4. The whole, that is, the front and back surfaces and the side surfaces of the first light-transmissive member 4 are all covered.

  In addition, the 2nd translucent member 4 may contain the fluorescent substance. The second light transmissive member 4 is made of a transparent resin such as an epoxy resin or a silicone resin, and has a refractive index smaller than that of the light emitting element 2 and the first light transmissive member 4 and larger than the refractive index of air. . The 2nd translucent member 4 is formed so that the light emitting element 2 and the 1st translucent member 4 whole may be covered by the shaping | molding by a metal mold | die, for example. With this configuration, the light from the light emitting element 2 that is totally reflected at the light emitting element 2 and the interface between the first light transmitting member 4 and the second light transmitting member 4 is reduced, and the light extraction property is improved. Therefore, the light emitted from the light emitting layer 2a of the light emitting element 2 can be efficiently led out to the outside of the light emitting element 2 and the illumination light source. Moreover, it is good to make the surface 4a of the 2nd translucent member 4 rough. Light is scattered and emitted from the surface 4a of the second translucent member 4 to obtain uniform irradiation light.

  Moreover, while using the light emitting element 2 which light-emits with the short wavelength light of blue or more for the light emitting element 2, the 2nd translucent member 4 is excited by the light which the light emitting element 2 emits to transparent resins, such as an epoxy resin and a silicone resin. It is good also as what contained the fluorescent substance converted into long wavelength fluorescence. In this case, the thickness (optical path length) L of the second translucent member 4 between the light emitting element 2 and the outer surface 4a of the second translucent member 4 is made substantially constant and the granular phosphor is uniform. It is desirable that they are dispersed. As a result, the light emitted from the light emitting element 2 can be wavelength-converted uniformly on the long wavelength side by the phosphor, and an illumination light source that emits light having a desired wavelength spectrum can be obtained. In addition, since the phosphor is scattered on the adjacent phosphor by reflecting a part of the light emitted from the light emitting element 2 on the surface of the phosphor, uniform fluorescence is emitted from the second translucent member 4. Can do. The light wavelength-converted by the phosphor is emitted from the phosphor in all directions.

  In the illumination light source of the present invention, as shown in FIGS. 6 and 7, the first translucent member 1 and the light emitting element 2 are covered with a second translucent member 4 that does not contain a phosphor. The second light transmissive member 4 may be covered with a third light transmissive member 5 containing a phosphor. In addition, you may make the 2nd translucent member 4 and the 3rd translucent member 5 contain the fluorescent substance which emits the fluorescence of a respectively different wavelength, for example. The third translucent member 5 is preferably covered with a constant thickness.

  The third translucent member 5 is a mold containing a phosphor in a mold that is larger than the mold that produced the second translucent member 4 after the second translucent member 4 is formed by molding. Three translucent members 5 are formed. By forming the third translucent member 5 containing a phosphor on the surface 4 a of the transparent second translucent member 4, the light emitted from the light emitting element 2 is transparent to the second translucent member 4. The light emitted from the light emitting element 2 can be efficiently extracted by irradiating the third translucent member 5 containing the phosphor and irradiating the phosphor, and the intensity of the light wavelength-converted by the phosphor is improved. . By disposing the transparent second translucent member 4 that does not contain a phosphor or the like around the light emitting element 2, the second light transmitting element 2 is not scattered by the phosphor or the like without being scattered by the phosphor or the like. It can be taken out toward the outside of the sex member 4. The second light transmissive member 4 preferably has a refractive index between the refractive index of the light emitting element 2 and the refractive index of the third light transmissive member 5. Further, the surface 5a of the third light transmissive member 5 may be roughened.

  Preferably, the illumination light source of the present invention has a light diffusing means 7 for diffusing light around the second light transmissive member 4 or the third light transmissive member 5, as shown in FIG. The light diffusing means 7 has a function of diffusely reflecting light from a light source for illumination and diffusing light in all directions. For example, when a resin such as acrylic is formed into a dome shape by molding with a mold, It can be obtained by making the surface a rough surface provided with an uneven surface such as satin. Further, for example, the surface of the dome-shaped glass can be produced by roughening by blasting. In addition, for example, Japanese paper may be formed in a dome shape and covered.

  Since the light emitting element 2 is small, when the light of the light source for illumination in which light emission is concentrated in a small area is directly viewed, glare (glare) may be felt, which may be uncomfortable. Therefore, the light diffusing unit 7 is provided to increase the surface area of the illumination light source, and the light is dispersed and emitted from the surface 7a of the light diffusing unit 7, thereby reducing glare and irradiating light that is kind to the eyes. It can be a light source.

  Preferably, in the illumination light source of the present invention, a gap 6 is provided between the illumination light source and the light diffusion means 7 as shown in FIG. With this configuration, even if a difference in thermal expansion occurs between the second light transmissive member 4 or the third light transmissive member 5 of the illumination light source and the light diffusing means 7, the thermal stress is the second light transmissive property. The member 4 or the third translucent member 5 is not added. Since the second light transmissive member 4 and the third light transmissive member 5 and the light diffusing means 7 are often made of different materials and a difference in thermal expansion is likely to occur, it is preferable to provide the gap 6 in this way. Further, by providing a gap 6 on the surfaces 4a and 5a of the second light transmissive member 4 or the third light transmissive member 5, after being emitted from the second light transmissive member 4 or the third light transmissive member 5, Since the light reflected and returned is totally reflected again on the surfaces 4a and 5a of the second light-transmissive member 4 or the third light-transmissive member 5, the light emission efficiency of the illumination light source is improved. Further, the gap 6 makes the light source of the illumination light source appear larger, and glare caused by the light source having a small and high luminance can be prevented. Further, the light emitting surface of the illumination light source becomes large, and a wide range can be irradiated.

  Such an illumination light source of the present invention is replaced with, for example, a general lighting fixture, a chandelier lighting fixture, a residential lighting fixture, an office, which is used indoors or outdoors, instead of lighting using a conventional bulb-type light emitter. Lighting fixtures, store decorations, exhibition lighting fixtures, street lamp lighting fixtures, guide light fixtures and signaling devices, stage and studio lighting fixtures, advertising lights, lighting poles, underwater lighting lights, strobe lights, spots Backlights for crime prevention lighting, emergency lighting equipment, flashlights, electric bulletin boards, etc. embedded in lights, utility poles, etc., dimmers, automatic flashers, displays, etc., video equipment, ornaments, illuminated switches, optical sensors, It can be used for a wide range of applications such as medical lights and in-vehicle lights.

  In addition, this invention is not limited to the example of the above embodiment, If it is in the range which does not deviate from the summary of this invention, it will not interfere at all. For example, a plurality of illumination light sources of the present invention may be arranged inside the light diffusing means 7 in order to improve the radiation intensity. Moreover, the 1st translucent member 1 is made into the cylinder or a rod-shaped thing, and it is good also as what has arrange | positioned the several light emitting element 2 in the outer peripheral surface. Alternatively, the light-emitting elements 2 are fixed so as not to overlap each of the front and back surfaces of the plurality of plate-like first light-transmitting members 1, and the plurality of first light-transmitting members 1 are arranged at an angle to each other. It is good. By configuring in this way, even if the light distribution in the circumferential direction of the single light emitting element 2 is biased, the illuminance in the circumferential direction of the illumination light source can be made uniform.

  In addition, when converting the light of the light emitting element 2 with a fluorescent substance, as shown in FIGS. 2B and 9, the entire circumference of the first light transmissive member 1 is covered with the second light transmissive member 4. If not, the light from the light emitting element 2 may leak out of the illumination light source via the first light transmissive member 1. In this case, the 3rd translucent member 5 containing a fluorescent substance may be provided in the surface which is not covered with the 2nd translucent member 4 of the 1st translucent member 1, and the shield A may be provided. . The shield A may be a member that does not transmit unnecessary leakage light. For example, when the leakage light is ultraviolet light, it may be formed of an ultraviolet cut filter material.

  In the description of the above embodiment, the terms “upper, lower, left and right” are merely used to describe the positional relationship in the drawings, and do not mean the positional relationship in actual use.

It is a perspective view which shows an example of embodiment of the light source for illumination of this invention. It is a perspective view which shows the other example of embodiment of the light source for illumination of this invention. It is sectional drawing which shows the other example of embodiment of the light source for illumination of this invention. It is sectional drawing which shows the other example of embodiment of the light source for illumination of this invention. FIG. 5 is a cross-sectional view showing the embodiment of FIG. 4 as viewed from the side. It is sectional drawing which shows the other example of embodiment of the light source for illumination of this invention. It is sectional drawing which shows the embodiment of FIG. 6 seeing from a side surface. It is sectional drawing which shows the other example of embodiment of the light source for illumination of this invention. It is sectional drawing which shows the other example of embodiment of the light source for illumination of this invention. It is sectional drawing which shows the example of embodiment of the conventional light-emitting device. It is sectional drawing which shows the other example of embodiment of the conventional light-emitting device. It is sectional drawing which shows the other example of embodiment of the conventional light-emitting device.

Explanation of symbols

1: 1st translucent member 1a: Wiring conductor 2: Light emitting element 2a: Light emitting layer 2b: Electrode 2c: Front surface (of light emitting element) 2d: Back surface (of light emitting element) 3: Lead terminal 4: Second light transmitting 4a: surface (of the second light transmissive member) 5: third light transmissive member 5a: surface (of the third light transmissive member) 6: gap 7: light diffusing means 7a: (of light diffusing means) surface

Claims (9)

A first translucent member that has a wiring conductor and transmits light, and has a front surface and a back surface that are parallel to the light emitting layer, and electrodes provided on the front surface are connected to the wiring conductor so that the front surface and the back surface a light emitting element for emitting light, a second light-transmissive member for sealing the back surface and the light emitting element has covering both the front and back surfaces of the first transparent member and said first light-transmissive member of the light emitting element A light source for illumination comprising a pair of lead terminals which are linear wires on the first translucent member and are symmetrically provided on both sides of the light emitting element .

2. The illumination light source according to claim 1, wherein the first translucent member is made of glass or sapphire. 3. The illumination light source according to claim 1, wherein the second translucent member is made of silicone resin or epoxy resin. The illumination light source according to any one of claims 1 to 3, wherein the wiring conductor is transparent. A curved surface is provided on the surface of the second light transmissive member so that the surface of the second light transmissive member is substantially orthogonal to the light emitted from the light emitting layer of the light emitting element , and the second light-transmissive member, the illumination light source according to any one of claims 1 to 4, characterized that you have spherically formed around the arranged light emitting elements as point source.

The illumination light source according to claim 1, wherein the second translucent member contains a phosphor. 6. The illumination light source according to claim 1, wherein the second light transmissive member is covered with a third light transmissive member containing a phosphor. An illumination light source comprising light diffusing means for diffusing light around the illumination light source according to claim 1. 9. The illumination light source according to claim 8, wherein a gap is provided between the illumination light source and the light diffusion means.

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