JP4948818B2 - Light emitting device and lighting device - Google Patents

Description

  The present invention relates to a light-emitting device and a lighting device that radiate light emitted from a light-emitting element to the outside after wavelength conversion with a phosphor.

  In recent years, a movement to use a light emitting device using a light emitting diode (LED) or the like for illumination is increasing, and a light emitting device with high radiation intensity is required.

  FIG. 8 shows a light-emitting device that reflects light emitted from a light-emitting element such as a conventional light-emitting diode well on the inner peripheral surface of the frame and emits the light uniformly and efficiently to the outside. In FIG. 8, the light-emitting device has a mounting portion 11a for mounting the light-emitting element 15 at the center of the upper main surface, and is led out of the light-emitting device from the mounting portion 11a and its periphery. A base 11 made of an insulator on which a wiring conductor (not shown) made of a lead terminal or metallized wiring for electrically connecting the inside and the outside is formed, and is bonded and fixed to the upper main surface of the base 11 so that the upper opening Is formed with a through hole 12a larger than the lower opening, and the inner peripheral surface of the through hole 12a is a reflecting surface that reflects light emitted from the light emitting element 15, and the upper end surface and the inner peripheral surface of the through hole 12a A frame-shaped reflecting member 12 having a step 12b formed between the two, a translucent member 13 having an end mounted and bonded to the step 12b, and a light emitting element 15 mounted and fixed on the mounting portion 11a. And is composed mainly of.

  The substrate 11 is made of ceramics or resin. When the substrate 11 is made of ceramics, a wiring conductor is formed on the upper main surface thereof by baking a metal paste at a high temperature. When the base 11 is made of resin, a lead terminal made of metal is molded integrally with the resin and provided inside the base 11.

The reflection member 12 has a frame shape in which a through hole 12a having an upper opening larger than the lower opening is formed and a reflection surface for reflecting light is formed on an inner peripheral surface thereof. The reflecting member 12 has a step 12b between the upper main surface and the inner peripheral surface. Specifically, the reflecting member 12 is made of aluminum (Al), Fe-Ni-cobalt (Co) alloy, or the like. It is made of metal, ceramics such as alumina ceramics, or resin such as epoxy resin, and is formed by a molding technique such as cutting, die molding or extrusion molding.

Then, the wiring conductor arranged around the mounting portion 11a and the light emitting element 15 are electrically connected through the electrical connection means 16 such as a bonding wire or a metal ball, and then the end of the translucent member 13 is attached. It is installed on the step 12b by being locked and adhered. As described above, the light emitted from the light emitting element 15 can be satisfactorily reflected on the inner peripheral surface of the frame body and radiated to the outside uniformly and efficiently (see Patent Document 1 below).
JP 2004-259958 A

  However, in the light emitting device disclosed in Patent Document 1, the gap between the inner peripheral surface of the step 12b and the outer peripheral side surface of the translucent member 13 is positioned by fitting the translucent member 13 into the step 12b. Therefore, the light emitted from the outer peripheral side surface of the translucent member 13 is repeatedly reflected and attenuated between the outer peripheral side surface of the translucent member 13 and the inner peripheral surface of the step 12b. It was easy to end. As a result, there is a problem that unevenness in intensity occurs in the light emitted from the light emitting device at the outer peripheral portion of the translucent member.

  Further, when the light emitting device is handled at the bonding portion between the translucent member 13 and the step 12b, the translucent member 13 may be peeled upward from the reflective member 12 by touching the translucent member 13 or the like. When a strong force is applied, the translucent member 13 tends to come off.

  Accordingly, the present invention has been completed in view of the above-described conventional problems, and an object thereof is to reduce a variation in intensity and luminance and improve a radiation intensity and a light emitting device storage package and a light emitting device. Is to provide.

The light emitting device of the present invention includes a base provided with a mounting portion on which the light emitting element is mounted on the upper main surface, a light emitting element mounted on the mounting portion, and surrounding the light emitting element on the upper main surface of the base. A sheet-like light-transmitting material containing a frame-like reflecting member disposed on the inner peripheral surface and provided with a support portion parallel to the upper main surface of the substrate, and a phosphor placed on the support portion And the translucent member has an inclined surface whose outer peripheral side surface extends from the upper surface to the lower surface, and the outer peripheral side surface of the translucent member is the upper and lower main parts of the translucent member. It is characterized by being formed rougher than the surface .

  In the light emitting device of the present invention, preferably, the translucent member has an outer peripheral side surface joined by a translucent adhesive, and is formed at an interface between the translucent adhesive and the translucent member. It is characterized by the presence of bubbles.

  The illuminating device of the present invention includes the light emitting device of the present invention, a drive unit on which the light emitting device is mounted and having an electrical wiring for driving the light emitting device, and light reflecting means for reflecting light emitted from the light emitting device. Including.

  The light-emitting device of the present invention is disposed so that the upper main surface is provided with a mounting portion on which a light-emitting element is mounted, the light-emitting element mounted on the mounting portion, and the upper main surface of the base so as to surround the light-emitting element. A frame-like reflecting member having an inner peripheral surface provided with a support portion parallel to the upper main surface of the substrate, and a sheet-like translucent member containing a phosphor placed on the support portion. Thus, the translucent member has an inclined side surface whose outer peripheral side surface extends from the upper surface toward the lower surface. Therefore, the translucent member contains a sheet-like phosphor on the support portion provided on the reflecting member. Since the light-sensitive member is placed, a distance can be provided between the light-emitting element and the light-transmitting member, and the optical path length through which the light emitted from the light-emitting element passes through the light-transmitting member containing the phosphor. Can be made substantially constant. As a result, the wavelength conversion efficiency of the light emitted from the light emitting element can be made substantially constant.

  In addition, since the support portion is provided on the inner peripheral surface of the frame, the side surface of the sheet-like translucent member is dropped so as to be along the inner peripheral surface of the reflecting member, and is accurately aligned with the support portion. In this state, the translucent member is installed.

  In addition, since the outer peripheral side surface of the translucent member is an inclined surface that spreads from the upper surface toward the lower surface, the light emitted outward from the outer peripheral side surface of the translucent member is reflected by the inner peripheral surface of the reflecting member. Thus, the radiation intensity of the light reflected upward and emitted from the light emitting device can be improved.

  In the light emitting device of the present invention, preferably, the translucent member has an outer peripheral side surface joined by a translucent adhesive, and bubbles exist at the interface between the translucent adhesive and the translucent member. Therefore, the light emitted from the outer peripheral side surface of the translucent member to the outside, reflected by the inner peripheral surface of the reflective member, and directed toward the translucent member again is again the inner periphery of the reflective member at the interface with the bubble. The light is reflected toward the surface, and this is repeated, and light emitted from the outer peripheral side surface of the translucent member is emitted upward. As a result, the radiation intensity of light emitted from the light emitting device can be improved.

  Further, when the translucent member is placed on the support portion and fixed by pouring a translucent adhesive between the inclined outer peripheral side surface and the inner peripheral surface of the reflecting member, The optical member is reliably and firmly joined to the support portion. In particular, the translucent member is difficult to peel off against the tensile stress upward of the reflecting member.

  As a result, there is little unevenness in intensity and luminance, and a light emitting device with excellent radiation intensity can be obtained.

  The illuminating device of the present invention includes the light emitting device of the present invention, a drive unit on which the light emitting device is mounted and having an electrical wiring for driving the light emitting device, and light reflecting means for reflecting light emitted from the light emitting device. Therefore, the light emitted from the light emitting element can be used effectively, and a small lighting device can be obtained. In addition, light can be emitted with a stable radiation intensity and a radiation angle, and an illumination device with less uneven color and uneven illuminance distribution on the irradiated surface can be obtained.

  In addition, the light-emitting device of the present invention is used as a light source, and a light reflecting means optically designed in an arbitrary shape is installed around these light-emitting devices, whereby an illumination device that emits light of an arbitrary light distribution is obtained. be able to.

  The light emitting device of the present invention will be described in detail below. FIG. 1 is a cross-sectional view showing an example of an embodiment of a light-emitting device of the present invention, and FIG. 2 is a cross-sectional view showing an example of an embodiment using a light-transmitting resin adhesive in the light-emitting device of the present invention. 3 shows an enlarged cross-sectional view of the main part of FIG. In FIG. 3, the arrows indicate the optical paths of light emitted from the outer peripheral side surface of the translucent member. In these drawings, 1 is a base, 1a is a mounting portion of a light emitting element 5 on which a light emitting element 5 provided on the upper main surface of the base 1 is placed, 2 is a reflecting member, 2a is an inner peripheral surface of the reflecting member, 2b Is a reflecting surface for reflecting light, 2c is a stepped portion, 2d is a support portion formed by the stepped portion 2c, 4 is a sheet-like translucent member containing phosphor (hereinafter referred to as a second translucent member). ) 5 is a light emitting element, and a light emitting device in which light emitted from the light emitting element 5 is mainly emitted to the outside with directionality is constituted. Reference numeral 3 denotes a translucent member (hereinafter referred to as a first translucent member) that does not contain a phosphor disposed so as to cover the light emitting element.

  The light emitting device of the present invention includes a base body 1 provided with a mounting portion on which the light emitting element 5 is mounted on the upper main surface, a light emitting element 5 mounted on the mounting portion, and a light emitting element 5 on the upper main surface of the base body 1. A reflection surface 2b is disposed on the inner peripheral surface 2a to reflect light emitted from the light emitting element 5, and a support portion 2d parallel to the upper main surface of the substrate 1 is provided on the inner peripheral surface 2a. The frame-shaped reflecting member 2, the first translucent member 3 containing no phosphor filled inside the reflecting member 2 below the support portion 2d, and the support portion 2d were placed. The sheet-shaped second translucent member 4 containing the phosphor is provided, and the second translucent member 4 has an inclined surface in which the outer peripheral side surface 4a extends from the upper surface toward the lower surface.

  Further, the second translucent member 4 is joined to the stepped portion 2c via the adhesive 6 between the outer peripheral lower surface and the support portion 2d, or the outer peripheral side surface 4a thereof is the translucent adhesive 6. When it is joined to the stepped portion 2c of the reflecting member 2 and is joined at the outer peripheral side surface 4a, bubbles 6a are formed at the interface between the adhesive 6 and the second translucent member 4. Has been.

  The substrate 1 in the present invention is made of an aluminum oxide sintered body (alumina ceramic), an aluminum nitride sintered body, a mullite sintered body, ceramics such as glass ceramics, a resin such as an epoxy resin, or a metal. Further, the base 1 has a mounting portion 1a on which the light emitting element 5 is placed, and a conductor layer to which an electrode of the light emitting element 5 is electrically connected is tungsten (W), molybdenum (Mo). -A layer composed mainly of a metal composed of manganese (Mn) or the like, or a lead terminal composed of copper (Cu), iron (Fe) -nickel (Ni) alloy, etc. is molded integrally with a resin. .

  Preferably, the mounting portion 1a is preferably formed on the upper surface of a convex portion protruding from the upper main surface of the base body 1, whereby the light emitted downward from the light emitting element 5 is also reflected by the reflecting member 2. It is possible to prevent the light from being absorbed by multiple reflections by the substrate 1 around the mounting portion 1a, and to use most of the light emitted from the light emitting element 5 for the emitted light from the light emitting device. Can do. As a result, the light emitting characteristics of the light emitting element 5 can be maximized, and a light emitting device having excellent light characteristics such as on-axis luminous intensity, luminance, and color rendering can be obtained.

  Further, the mounting portion 1a which is a convex portion protruding from the upper main surface of the base body 1 makes it easy to mount the light emitting element 5 on the mounting portion 1a, and accurately and easily mount the light emitting element 5 at a desired position. You can also

  In this case, the mounting portion 1a is separated from the base 1 by removing the periphery of the mounting portion 1a of the base body 1 by means such as cutting, mechanical polishing, or blast polishing, or by die molding or ceramic green sheet lamination. It can be formed integrally. Or you may join the member used as the mounting part 1a to the upper main surface of the base | substrate 1 with an adhesive agent.

  A conductor layer is formed on the upper surface of the mounting portion 1a on the upper main surface of the substrate 1 to electrically connect the electrodes of the light emitting element 5 via electrical connection means such as solder. The pattern for electrical connection by the conductor layer is led out to the outer surface of the light emitting device via a wiring conductor (not shown) formed in the base 1 and connected to the external electric circuit board. An external electric circuit is electrically connected.

  As the light emitting element 5, an LED, a laser diode (LD), an electroluminescence (EL) element, other solid light emitting elements, or the like is used.

  As a method of connecting the light emitting element 5 to the conductor layer, a method of connecting via a bonding wire or a method using a flip chip bonding method in which the lower surface of the light emitting element 5 is connected by an electrical connecting means such as a solder bump is used. Used. Preferably, the connection is made by a flip chip bonding method. Accordingly, since the conductor layer can be provided immediately below the light emitting element 5, it is not necessary to provide a space for providing an electrical connection pattern on the upper surface of the base 1 around the light emitting element 5. Therefore, it is possible to prevent the light emitted from the light emitting element 5 from being absorbed by the electrical connection pattern of the substrate 1 and the axial luminous intensity from being lowered.

  The conductor layer serving as the electrical connection pattern is, for example, a lead terminal made of Fe-Ni-Co alloy or the like by forming a metallized layer of a metal powder such as W, Mo, Cu, or Ag on the surface and inside of the substrate 1. Is embedded in the base 1 and one end thereof is exposed to the mounting portion 1a, or an input / output terminal made of an insulator on which a wiring conductor is formed is fitted and joined to a through hole provided in the base 1.

  The exposed surface of the electrical connection pattern should be coated with a metal having excellent corrosion resistance, such as Ni or gold (Au), with a thickness of about 1 to 20 μm. Can be effectively prevented, and the connection between the light emitting element 5 and the electrical connection pattern can be strengthened. Therefore, for example, an Ni plating layer having a thickness of about 1 to 10 μm and an Au plating layer having a thickness of about 0.1 to 3 μm are sequentially deposited on the exposed surface of the electrical connection pattern by an electrolytic plating method or an electroless plating method. More preferably.

  Further, the reflecting member 2 is attached to the upper surface of the base 1 with a bonding material such as solder, a brazing material such as Ag brazing, or a resin adhesive such as epoxy resin. The reflection member 2 has a through hole formed in the center so that the upper side becomes an inclined surface toward the outside, and the inner peripheral surface 2a of the through hole reflects the light emitted from the light emitting element 5; Has been.

  The reflecting member 2 is made of metal, ceramics, resin, or the like, and is formed by performing cutting processing, mold forming, or the like. Further, the reflecting surface 2b formed on the inner peripheral surface 2a of the through hole is not particularly limited as long as it reflects light, but the inner peripheral surface 2a of the through hole is polished to have a higher reflectance. Or smoothing by pressing a mold, or the like on the inner peripheral surface 2a of the through hole by, for example, plating, vapor deposition, etc., Al, Ag, Au, platinum (Pt), titanium (Ti), chromium (Cr) The reflective surface 2b is formed by forming a metal thin film layer having a high reflectance such as Cu and Cu. In addition, the shape of the through hole in plan view may be any of a polygon, a circle, and an ellipse.

  In addition, the arithmetic average roughness Ra of the surface of the reflecting surface 2b is preferably 0.004 to 4 μm, whereby the reflecting surface 2b can favorably reflect the light from the light emitting element 5 and the phosphor. When Ra exceeds 4 μm, it becomes difficult to uniformly reflect the light of the light emitting element 5 and it becomes easy to diffusely reflect inside the light emitting device. On the other hand, if it is less than 0.004 μm, it tends to be difficult to form such a surface stably and efficiently.

  The inner peripheral surface 2a to be the reflecting surface 2b has, for example, a linear inclined surface as shown in FIG. 1 whose longitudinal cross-sectional shape spreads outward as it goes upward, and spread outward as it goes upward Examples of the shape include a curved inclined surface or a linear inclined surface whose inclination angle changes in the middle.

  Further, a step 2c is formed on the inner peripheral surface 2a. The stepped portion 2c has a bottom surface formed in parallel with the upper main surface of the base 1 to serve as a support portion 2d, and a side surface formed perpendicular to the bottom surface. The support portion 2d has a function of contacting the lower surface of the second light transmissive member 4 and supporting the second light transmissive member 4 at a predetermined position on the inner peripheral surface 2a. It is composed of a plurality of provided convex portions. Note that the side surface of the stepped portion 2c does not have to be completely perpendicular to the upper main surface of the base 1, and may be an inclined surface that spreads outward as it goes slightly upward.

  As shown in FIG. 1, the stepped portion 2 c is provided integrally with the reflecting member 2, and is formed by performing cutting or molding when the reflecting member 2 is manufactured. Alternatively, the reflecting member 2 is formed by making the upper and lower parts separate from each other with the stepped portion 2c as a boundary.

  By forming the step portion 2c on the inner peripheral surface 2a in this way, the first translucent member 3 uses the support portion 2d of the step portion 2c as a mark so as not to exceed the support portion 2d. 2 and can improve the working efficiency when filling the first translucent member 3 using a dispenser or the like, and the first translucent member 3 can be filled with a predetermined amount almost accurately. It is possible to fill only. Further, by forming the stepped portion 2c on the inner peripheral surface 2a, the support member 2d can prevent the first translucent member 3 that attempts to wet and spread so as to scoop up on the inner peripheral surface 2a. It is possible to stabilize the surface shape of the upper surface of the first translucent member 3 injected inside the reflecting member 2. As a result, the emission angle of the light emitted from the light emitting element 5 from the upper surface of the first translucent member 3 can be made constant, and from the upper surface of the first translucent member 3. The light emission intensity can be kept constant without the light flux of the emitted light varying.

  As shown in FIG. 1, the step portion 2c has a support portion 2d formed in parallel with the upper main surface of the base 1 and a side surface formed perpendicular to the bottom surface, that is, the inner peripheral surface 2a is perpendicular to the bottom surface. If the side surface of the sheet-like second translucent member 4 is dropped along the inner peripheral surface 2a of the reflecting member 2 by being formed to be cut out, the second translucent member 4 is placed on the support portion 2d in a state where it is accurately aligned by the side surface of the step portion 2c. Therefore, the second translucent member 4 can be installed accurately and easily at a predetermined position of the reflecting member 2.

  Further, the position where the step portion 2 c is formed may be formed anywhere between the upper surface of the light emitting element 5 on the inner peripheral surface 2 a of the reflecting member 2 and the upper end of the reflecting member 2. That is, the step portion 2c may be formed between the upper surface of the light emitting element 5 on the inner peripheral surface 2a as shown in FIG. 1 and the upper end of the reflecting member 2, or the inner peripheral surface 2a as shown in FIG. It may be formed at the upper end of.

  Preferably, it is good to form between the upper surface of the light emitting element 5 of the internal peripheral surface 2a and the upper end of the reflection member 2, and the light radiated | emitted from the 2nd translucent member 4 by this structure is 2nd. The light can be emitted from the light emitting device at a predetermined radiation angle by being reflected by the reflective surface 2b above the translucent member 4. Also, with this configuration, the second translucent member 4 does not protrude from the upper end of the reflecting member 2, so that the second translucent member 4 touches an external device and is damaged or the second translucent member 4 is damaged. It is possible to prevent the second translucent member 4 from being peeled off due to the tensile stress that pulls the optical member 4 above the reflecting member 2.

  Furthermore, since the 2nd translucent member 4 containing fluorescent substance and made into the sheet form is arrange | positioned on the 1st translucent member 3 which does not contain fluorescent substance, it is 2nd translucent. A distance is provided between the light-emitting member 4 and the light-emitting element 5, and the optical path length through which the light emitted from the light-emitting element 5 passes through the second light-transmissive member 4 containing the phosphor is substantially constant. can do. As a result, the wavelength conversion efficiency of the light emitted from the light emitting element 5 can be made substantially constant.

  Furthermore, the second translucent member 4 is an inclined surface whose outer peripheral side surface 4a extends from the upper surface toward the lower surface, and the second translucent member 4 is installed on the stepped portion 2c, The lower surface of the second translucent member 4 and the support surface 2d are fixed with an adhesive 6 or fixed by pouring the translucent adhesive 6 between the outer peripheral side surface 4a and the stepped portion 2c. Is done.

  When the outer peripheral side surface 4a is rougher than the upper and lower main surfaces of the second light transmissive member 4, the air is caught when the adhesive 6 is poured, and the second light transmissive member 4 and Bubbles 6 a are formed at the interface with the adhesive 6. Since the bubbles 6a are formed, as shown in FIG. 2, the light radiated outward from the outer peripheral side surface 4a of the second translucent member 4 is reflected by the side surface of the step portion 2c, and further the second Repetitively reflecting with the bubbles 6a formed at the interface between the translucent member 4 and the adhesive 6, and radiating light emitted from the outer peripheral side surface of the second translucent member 4 upward; Become.

  In other words, the second translucent member 4 has an inclined surface in which the outer peripheral side surface 4 a extends from the upper surface to the lower surface, and the bubbles 6 a formed at the interface between the second translucent member 4 and the adhesive 6. Is arranged so that the distance from the side surface of the stepped portion 2c increases from the bottom to the top, the light emitted outward from the outer peripheral side surface 4a of the second light transmissive member 4 is transmitted to the second light transmissive member. The reflective member 4 can be reflected upward.

  When the lower surface of the second translucent member 4 is fixed with the adhesive 6, the light is reflected upward by the outer peripheral side surface 4 a of the second translucent member 4.

  As a result, unevenness in the intensity of light emitted from the light emitting device can be reduced, and the radiation intensity of the light emitted from the light emitting device can be improved.

  Furthermore, the second translucent member 4 is installed on the support portion 4d of the stepped portion 2c, and the translucent adhesive 6 is poured between the inclined outer peripheral side surface 4a and the stepped portion 2c. Therefore, the second translucent member 4 is reliably and firmly joined to the stepped portion 2c. In particular, the second translucent member 4 is difficult to peel against the tensile stress upward of the reflecting member 2.

  For the first translucent member 3, a transparent member made of a transparent resin such as an epoxy resin or a silicone resin, sol-gel glass or the like is used. As shown in FIG. 1, the first translucent member 3 can be formed by pouring an uncured liquid material onto the upper surface of the light emitting element 5 with an injection machine such as a dispenser and then curing. The first translucent member 3 also has a function of protecting the light emitting element 5. The first translucent member 3 is not necessarily used, but the refractive index between the refractive index of the light emitting element 5 and the refractive index of air is set between the light emitting element 5 and the air layer. By interposing the first translucent member 3 possessed, the light emitted from the light emitting element 5 can be easily led out.

  The second translucent member 4 is the same transparent resin as the first translucent member 3 or a different type of transparent resin, and is excited by light emitted from the light emitting element 5 on a transparent resin such as an epoxy resin or a silicone resin. Thus, a phosphor that converts to long wavelength fluorescence is contained. The second translucent member 4 is molded into a sheet shape according to the shape of the inner peripheral surface 2a of the through-hole by molding using a mold, or a sheet shape that becomes the second translucent member 4 The second transparent member 4 is formed in a predetermined shape by preparing a transparent resin in advance and punching it with a punch. And the sheet-like 2nd translucent member 4 is installed in the inner surface of the frame-shaped reflection member 2 by mounting and fixing on the upper side of the level | step-difference part 2c. Here, it is important that the second translucent member 4 has a constant thickness and the phosphor is uniformly dispersed. With this configuration, the light emitted from the light-emitting element 5 is emitted by the phosphor with a long wavelength. The wavelength can be efficiently converted to the side, and light having a desired wavelength spectrum can be obtained.

  In the punching process, a relatively soft material having a tensile strength of about 5 MPa to 7 MPa is used as the material of the second light transmissive member 4, and the second light transmissive member 4 formed into a sheet shape is about 1 mm per second. It may be formed by punching from the lower side at a slow punching speed. Accordingly, the outer peripheral side surface 4 a of the second light transmissive member 4 is an inclined surface extending from the upper surface toward the lower surface, and the outer peripheral side surface 4 a is rougher than the upper and lower main surfaces of the second light transmissive member 4. Can be made. In this case, the second translucent member 4 is preferably made of a silicone resin, and can satisfy a tensile strength of 5 MPa to 7 MPa.

  Moreover, the translucent adhesive 6 for fixing the 2nd translucent member 4 to the level | step-difference part 2c of the reflection member 2 is the 1st translucent member 3 or the 2nd translucent member 4, and Similarly, it is made of transparent resin such as epoxy resin or silicone resin, sol-gel glass or the like. The adhesive 6 does not contain a phosphor as in the first translucent member 3. This is because if the phosphor is contained in the adhesive 6, it is difficult to uniformly disperse the phosphor in the adhesive 6, and the light emitted from the light emitting element 5 can be uniformly wavelength-converted. This is because there are cases where it is not possible.

  Here, preferably, the angle formed between the lower main surface of the second translucent member 4 and the outer peripheral side surface 4a is 45 ° or more and less than 90 °, more preferably 75 ° or more and 89 ° or less. When the angle is less than 45 °, the inclined portion of the outer peripheral side surface 4a increases the portion where the thickness is reduced in the outer peripheral portion of the second translucent member 4, and uneven color and uneven illuminance distribution are likely to occur. In the case of 90 ° or more, the light emitted outward from the outer peripheral side surface 4a of the second translucent member 4 is covered with the outer peripheral side surface 4a of the second translucent member 4 and emitted upward. This tends to make it difficult to improve the radiation intensity of the light emitting device. In addition, the adhesion of the second translucent member 4 to the tensile stress above the reflecting member 2 is weakened, and the second translucent member 4 tends to be unable to be firmly fixed. When the angle is about 70 ° or more, the second translucent member 4 can be formed by the punching method.

  As a result, the radiant intensity, the axial luminous intensity, the brightness, the color rendering properties, etc. are constant in each light emitting device, and it is possible to effectively prevent the occurrence of uneven color and uneven intensity. A light emitting device having excellent light characteristics such as color rendering can be obtained.

  Further, the stepped portion 2c provided on the inner peripheral surface 2a of the reflecting member 2 may be produced, for example, by separately manufacturing the reflecting member 2 at the position of the support portion 2d and joining them together. Thus, by making the reflecting member 2 separate from the top and the bottom, the stepped portion 2c can be easily processed, and the reflecting member 2 can be formed into a shape suitable for mass production.

  The reflecting member 2 may be attached to any part other than the mounting portion 1a on the upper surface of the base 1, but the light emitting element 5 is placed around the light emitting element 5 with a desired surface accuracy, for example, in the longitudinal section of the light emitting device. It is preferable that the reflective surface 2b is provided so as to be provided in a state where the reflective surfaces 2b provided on both sides of the light emitting element 5 are symmetrically sandwiched therebetween. As a result, not only can the wavelength of the light from the light emitting element 5 be converted by the phosphor contained in the second light transmissive member 4 and directly emitted to the outside, but also the light emitted from the light emitting element 5 in the lateral direction or the fluorescence The light emitted downward from the body can be uniformly reflected by the reflecting surface 2b, and the axial luminous intensity, luminance, color rendering, etc. can be effectively improved.

  In particular, the closer the reflection member 2 is to the mounting portion 1a, the more prominent the above effect is. Accordingly, by surrounding the mounting portion 1a with the reflecting member 2, more light can be reflected, and a higher on-axis luminous intensity can be obtained.

  The reflection member 2 installed so as to surround the second translucent member 4 containing the phosphor condenses the light emitted from the second translucent member 4 containing the phosphor, The light can have a radiation angle.

  In addition, the light emitting device of the present invention may be arranged in a predetermined arrangement by using one light source as a light source, or a plurality of light emitting devices, for example, a lattice shape, a staggered shape, a radial shape, a concentric shape such as a circular shape or a polygonal shape. It can be set as an illuminating device by using as a light source arranged in the. As a result, the illumination device of the present invention has lower power consumption and longer life than the illumination device using the conventional discharge when light emission by the light emitting element 5 made of a semiconductor is used. A small lighting device with little heat generation can be obtained. In addition, by forming the second translucent member 4 containing a phosphor in a sheet shape and making the thickness constant and installing it at a distance from the light emitting element 5, uneven color of the light emitting device can be reduced, Light can be emitted at a stable radiation intensity and radiation angle over a long period of time, and an illumination device with little uneven color and uneven illuminance distribution on the irradiated surface can be obtained.

  For example, as shown in FIG. 4 and FIG. 5, a plurality of light emitting devices 101 of the present invention are arranged in a plurality of rows on a driving unit 102 such as a light emitting device driving circuit board, and around the light emitting device 101. In the case of an illuminating device in which a light reflecting means 103 such as a metal reflector optically designed in a required shape is installed, the light emitting devices 101 in adjacent rows are arranged between a plurality of light emitting devices 101 arranged in a row. It is preferable that the arrangement is a so-called staggered arrangement. That is, when the light emitting devices 101 are arranged in a grid, glare is strengthened by arranging the light emitting devices 101 as light sources on a straight line, and such a lighting device enters human vision. However, since the light-emitting device 101 is arranged on the plane at almost equal intervals, the glare is suppressed and the discomfort to the human eye can be reduced. it can. Furthermore, compared with the case where the light emitting devices 101 are arranged on a straight line, the distance between the adjacent light emitting devices 101 is increased, so that thermal interference between the adjacent light emitting devices 101 is suppressed, and the light emitting device 101 is mounted. Thus, heat accumulation in the drive unit 102 is suppressed, and heat is efficiently dissipated to the outside of the light emitting device 101. As a result, it is possible to manufacture a long-life lighting device having stable optical characteristics over a long period of time with less discomfort to human eyes.

  In addition, the lighting device includes a plurality of concentric groups of circular or polygonal light emitting devices 101 each composed of a plurality of light emitting devices 101 on the driving unit 102 as shown in the plan view and the cross-sectional view shown in FIGS. In the case of the arrayed lighting devices, it is preferable to increase the number of light emitting devices 101 arranged in one circular or polygonal light emitting device 101 group from the center side of the lighting device to the outer peripheral side. Thereby, it is possible to arrange more light emitting devices 101 while maintaining an appropriate interval between the light emitting devices 101, and it is possible to further improve the illuminance of the lighting device. Further, it is possible to reduce the density of the light emitting device 101 in the central portion of the lighting device, and to suppress heat accumulation in the central portion of the driving unit 102. Therefore, the temperature distribution in the drive unit 102 is uniform, heat is efficiently transmitted to the external electric circuit board or the heat sink where the lighting device is installed, and the temperature rise of the light emitting device 101 can be suppressed. As a result, the light-emitting device 101 can operate stably over a long period of time, and a long-life lighting device can be manufactured.

  Examples of such lighting devices include general lighting fixtures, chandelier lighting fixtures, residential lighting fixtures, office lighting fixtures, store lighting, display lighting fixtures, and street lamp lighting fixtures that are used indoors and outdoors. , Guide light fixtures and signaling devices, stage and studio lighting fixtures, advertising lights, lighting poles, underwater lighting lights, strobe lights, spotlights, security lights embedded in power poles, emergency lighting fixtures, flashlights , Electronic bulletin boards and the like, backlights such as dimmers, automatic flashers, displays, moving image devices, ornaments, illuminated switches, optical sensors, medical lights, in-vehicle lights, and the like.

  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 light emitting elements 5 may be mounted on the base 1 in order to improve the radiation intensity. It is also possible to arbitrarily adjust the angle of the reflecting surface 2b. By providing a complementary color gamut, better color rendering can be obtained.

  Further, the lighting device of the present invention is not limited to one in which a plurality of light emitting devices 101 are installed in a predetermined arrangement, but may be one in which one light emitting device 101 is installed in a predetermined arrangement. For example, one light emitting device 101 may be arranged at the center of the lighting device.

It is sectional drawing which shows an example of embodiment of the light-emitting device of this invention. It is sectional drawing which shows the other example of embodiment of the light-emitting device of this invention. It is a figure which shows the principal part expanded sectional view of the light-emitting device of FIG. 2, and demonstrates the optical path of the light light-emitted from the outer peripheral side surface of a 2nd translucent member. It is a top view which shows an example of embodiment of the illuminating device of this invention. It is sectional drawing of the illuminating device of FIG. It is a top view which shows the other example of embodiment of the illuminating device of this invention. It is sectional drawing of the illuminating device of FIG. It is sectional drawing which shows the example of the conventional light-emitting device.

Explanation of symbols

1: Base 1a: Mounting portion 2: Reflecting member 2a: Inner peripheral surface 2b: Reflecting surface 2c: Stepped portion 2d: Supporting portion 3: First translucent member 4: Second translucent member 4a: (first Outer peripheral side surface of second translucent member 5: Light emitting element 6: Adhesive 6a: Air bubble
101: Light-emitting device
102: Drive unit
103: Light reflection means

Claims (3)

A base provided with a mounting portion on which the light emitting element is mounted on the upper main surface;
A light emitting element mounted on the mounting portion;
A frame-shaped reflecting member disposed on the upper main surface of the base so as to surround the light emitting element, and provided with a support portion parallel to the upper main surface of the base on the inner peripheral surface;
Comprising a sheet-like translucent member containing a phosphor placed on the support,
The translucent member has an inclined surface whose outer peripheral side surface extends from the upper surface toward the lower surface, and the outer peripheral side surface of the translucent member is formed to be rougher than the upper and lower main surfaces of the translucent member. the light emitting device characterized in that is. 2. The translucent member has an outer peripheral side surface joined by a translucent adhesive, and air bubbles are present at an interface between the translucent adhesive and the translucent member. The light emitting device according to 1. The light-emitting device according to claim 1, a drive unit that includes the light-emitting device and has an electrical wiring that drives the light-emitting device, and a light reflecting unit that reflects light emitted from the light-emitting device. Including lighting device.

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