JP4986608B2 - Light emitting device and lighting device - Google Patents

Description

  The present invention relates to a light emitting device and an illuminating device for converting the wavelength of light emitted from a light emitting element with a phosphor and radiating the light to the outside.

  In recent years, there is a movement to use a light emitting device using a light emitting diode (LED) or the like for illumination.

  FIG. 9 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 radiates it uniformly and efficiently to the outside. In FIG. 9, the light-emitting device is joined to a base 11 made of an insulator having a mounting portion 11a for the light-emitting element 12 on the upper surface, and an inner peripheral surface 13b while being joined to an outer peripheral portion of the upper surface of the base 11 so as to surround the mounting portion 11a. A frame-like reflecting member 13 which is a reflecting surface for reflecting light emitted from the light emitting element 12, and a second light transmitting member formed so as to cover the light emitting element 12 inside the reflecting member 13 16 and the first translucent member 15 provided so as to cover the second translucent member 16 and phosphors are unevenly distributed in layers inside, and the light emission mounted and fixed on the mounting portion 11a It is composed of the element 12.

  The frame body 13 has an upper opening larger than the lower opening, so that the inner peripheral surface 13b of the through hole is an inclined surface that spreads outward toward the upper side, and light emitted from the light emitting element 12 Is a reflecting surface that reflects upward.

As described above, the light emitted from the light emitting element 12 is favorably reflected by the inner peripheral surface 13b of the reflecting member 13, guided into the first light transmissive member 15, and included in the first light transmissive member 15. A high-luminance light-emitting device that can radiate light having a desired wavelength converted by a phosphor to the outside is configured (for example, see Patent Document 1 below).
JP 2006-93399 A

  However, even if fluorescence is uniformly emitted from the entire surface of the first light transmissive member 15, the fluorescence is not emitted from the upper main surface of the reflecting member 13 around the first light transmissive member 15. There is a problem in that a shadow is generated around one translucent member 15 and it does not appear to emit light over the entire top surface of the light emitting device. That is, when a plurality of light emitting devices are arranged adjacent to each other to form an illuminating device, the entire light emitting surface of the illuminating device does not appear to emit light uniformly, but appears to be a collection of point light. There is a problem.

  Accordingly, the present invention has been completed in view of the above-described conventional problems, and an object of the present invention is to provide a light emitting device and a lighting device that appear to emit light from the entire light emitting surface side of the light emitting device. .

The light emitting device of the present invention, a sheet containing a recess for the light emitting element into the upper surface is housed provided substrate, a light emitting element mounted in the recess, the phosphor disposed above the light emitting element made by and a Jo translucent member, we established the sheet-like light-transmitting member so as to protrude upward from the upper surface of the substrate in a plan view, the size of the sheet-like light-transmitting member The size of the substrate is made smaller than the size of the substrate, and a translucent member is disposed between the outer peripheral side surface of the sheet-like translucent member and the upper main surface of the substrate. The optical member and the base are fixed, and the light emitted from the outer peripheral side surface of the sheet-like translucent member is irradiated to the upper main surface of the base around the recess. Features.

The light emitting device of the present invention, preferably, the projecting distance from the upper major surface of the base of the sheet-like translucent member, the outer peripheral edge of the upper major surface of the substrate from the outer peripheral side surface of the sheet-shaped translucent member It is characterized by being 0.75 times or more of the width dimension up to.

  In the light emitting device of the present invention, preferably, a stepped portion is provided in the recessed portion opening of the base so that the recessed portion expands outward, and the first translucent member is placed on the stepped portion. It is characterized by being.

The light emitting device of the present invention is preferably characterized in that a gap is provided between the outer peripheral side surface of the sheet-like translucent member and the inner surface of the stepped portion.

  The light-emitting device of the present invention is preferably characterized in that the base is provided with chamfered portions at corners in plan view.

  The light-emitting device of the present invention is preferably characterized in that the light-emitting device is a polygon having opposite sides in parallel in plan view.

  In the light emitting device of the present invention, preferably, a convex portion is provided on one of the opposing sides of the base body, and a concave portion that is fitted to the convex portion of the adjacent light emitting device is provided on the other side. It is characterized by.

  According to another aspect of the present invention, there is provided a lighting device including the light emitting device arranged so that a plurality of the lighting devices are adjacent to each other, and a substrate having electric wiring for driving the light emitting device.

The illumination device of the present invention is preferably characterized in that an ultraviolet cut film is provided above the sheet-like translucent member of the light emitting device.

The light emitting device of the present invention, a recess for the light emitting element into the upper surface is housed provided substrate, a light emitting element mounted in the recess, the sheet-like magnetic containing a fluorescent body disposed above the light emitting element The sheet-like translucent member is installed so as to protrude upward from the upper main surface of the substrate, and the size of the sheet-like translucent member is the size of the substrate in plan view. The translucent member is disposed between the outer peripheral side surface of the sheet-like translucent member and the upper main surface of the substrate, and the translucent member fixes the sheet-like translucent member and the substrate. The light emitted from the outer peripheral side surface of the sheet-like translucent member is emitted from the outer peripheral side surface of the sheet-like translucent member because the upper main surface of the substrate around the recess is irradiated. Light is applied to the upper main surface of the substrate facing the outer peripheral side surface and the upper side Since the reflected, shadow is not generated around the sheet-like light-transmitting member, the entire upper surface of the light emitting device appears to be emitting.

  In the light emitting device of the present invention, preferably, since the second light transmissive member is disposed inside the recess so as to cover the light emitting element, the second light transmissive member has a refractive index of the light emitting element. Therefore, the light emitted by the light emitting element can be easily led out of the light emitting element.

In the light-emitting device of the present invention, preferably, a translucent member is disposed between the outer peripheral side surface of the sheet-like translucent member and the upper main surface of the base, and the translucent member and the sheet-like translucent member Since the base is fixed, light emitted from the outer peripheral side surface of the sheet-like translucent member can be easily guided to the upper main surface of the base around the recess.

The light emitting device of the present invention, preferably, the width of the projecting dimension from the upper surface of the base sheet translucent member, from the outer peripheral side surface of the sheet-like light-transmitting member to the outer peripheral edge of the upper surface of the base body Of 0.7
Since it is 5 times or more, the illuminance distribution on the upper main surface of the substrate becomes moderate, and when the light emitting device is viewed from above, it appears that light is emitted uniformly over the entire upper surface of the light emitting device.

In the light emitting device of the present invention, preferably, a stepped portion is provided in the opening of the recessed portion of the base so that the recessed portion expands outward, and a sheet-like translucent member is placed on the stepped portion. , it is possible to hold the sheet-like light-transmitting member at a predetermined position by placing the sheet-shaped sheet-like light-transmitting member containing a phosphor on the inner bottom surface of the step portion, the sheet-like permeable by the inner surface of the stepped portion It becomes easy to align the optical member.

The light emitting device of the present invention is preferably generated from the light emitting element when the light emitting element is operated, since a gap is provided between the outer peripheral side surface of the sheet-like translucent member and the inner side surface of the stepped portion. Even if a thermal expansion difference occurs between the substrate and the sheet-like translucent member due to heat, the density of the phosphor contained in the sheet-like translucent member is reduced by absorbing this thermal expansion difference in the gap. It is possible to prevent the sheet-like translucent member from being warped and deformed, and the sheet-like translucent member from being peeled off from the substrate. Therefore, it is possible to prevent unevenness in the intensity of light emitted from the light emitting device.

  In the light emitting device of the present invention, it is preferable that the base is provided with a chamfered portion at a corner portion in plan view, and thus when the light emitting device is mounted on the external electric circuit substrate, It is possible to easily determine and mount the mounting direction of the light emitting device with respect to the positive electrode and the negative electrode.

  The light-emitting device of the present invention is preferably a polygon in which the sides facing each other are parallel in plan view, so that a plurality of light-emitting devices are arranged adjacent to each other without gaps and mounted on the drive unit. By doing so, an illumination device that emits light in a planar shape can be obtained.

  The light emitting device of the present invention is preferably adjacent to the concave portion because the convex portion is provided on one side of the substrate facing each other and the concave portion is provided on the other side so as to match the convex portion of the adjacent light emitting device. By connecting the light emitting devices so that the convex portions of the light emitting devices are fitted, it becomes easy to arrange the light emitting devices in a line. The convex portion and the concave portion can also be used as a mark for determining the mounting direction of the light emitting device.

  The lighting device of the present invention includes a light emitting device arranged so that a plurality of the lighting devices are adjacent to each other and a substrate having an electric wiring for driving the light emitting device, so that it can be a surface emitting light device. .

Lighting apparatus of the present invention, preferably, since the ultraviolet Kattofu I Lum is provided above the sheet-like transparent member of the light emitting device, it is possible to shield the ultraviolet rays contained in the light emitted from the light emitting element . For example, it can be prevented by the use of a lighting device provided with an ultraviolet Kattofu I Lum as for exhibition lighting fixture, that the ultraviolet deterioration of sunburn to exhibit results.

  The light-emitting device and lighting device of the present invention will be described in detail below. 1 is a perspective view showing an example of an embodiment of a light-emitting device according to the present invention, FIG. 2 is a vertical cross-sectional view of the light-emitting device in FIG. It is a longitudinal cross-sectional view which shows the other example of embodiment in -X '. FIG. 4 is a top view showing another example of the embodiment of the light emitting device of the present invention. FIG. 5 is a top view showing an example of the embodiment of the lighting device of the present invention, and FIG. 6 is a top view showing another example of the embodiment of the lighting device of the present invention.

  In these figures, 1 is a base, 1a is a bottom of the base 1, 1b is a side wall of the base 1, 1c is a recess of the base 1, 1d is an inner peripheral surface of the side wall 1b, and 1e is a light emission provided in the recess 1c. Mounting portion of the light emitting element 2 on which the element 2 is placed, 1f is an upper main surface of the base 1 (side wall portion 1b), 3 is a stepped portion, 3a is an inner bottom surface of the stepped portion 3, and 3b is an inner surface of the stepped portion 3. 1 g is a chamfered portion, 5 is a sheet-like or flat plate-like first translucent member containing phosphor, 5 a is an outer peripheral side surface of the first translucent member 5, and 6 is a second translucent member. , 7 is a third translucent member, 8 is a gap, 9 is a convex portion, and 10 is a concave portion. The light emitting device and the illuminating device of the present invention in which light emitted from the light emitting element 2 is radiated to the outside mainly by the base body 1, the light emitting element 2, and the first translucent member 5 are configured.

  As shown in FIGS. 1 to 3, the light-emitting device of the present invention includes a base body 1 provided with a recess 1 c that accommodates the light-emitting element 2 on the upper main surface, a light-emitting element 2 mounted on the recess 1 c, 1 and a first translucent member 5 containing a phosphor disposed above, and the size of the first translucent member 5 is smaller than the size of the substrate 1 in plan view. The first translucent member 5 is installed so as to protrude upward from the upper main surface 3a of the base 1, so that the outer peripheral side surface of the first translucent member 5 is the base 1 around the recess 1c. It faces the upper main surface 1f.

  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. The substrate 1 has a mounting portion 1e for mounting the light emitting element 2 on the bottom surface of the recess 1c in the recess 1c, and tungsten (W) to which the electrode of the light emitting element 2 is electrically connected is mounted on the mounting portion 1e. ), A connection pad 1h made of a conductor layer mainly composed of a metal made of molybdenum (Mo) -manganese (Mn), or a lead terminal made of a copper (Cu), iron (Fe) -nickel (Ni) alloy, or the like. The connection pad 1h molded integrally with is drawn out.

  The electrode of the light emitting element 2 is electrically connected to the upper surface of the connection pad 1h via an electrical connection means such as solder. The connection pad 1h is led out to the outer surface of the light emitting device via a wiring conductor (not shown) formed inside the base 1, and further connected to an external electric circuit board, whereby the light emitting element 2 and the external electric circuit are connected. Are electrically connected to each other.

  For the light emitting element 2, an LED (Light Emitting Diode), 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 2 to the connection pad 1h, a method of connecting via a bonding wire or a flip chip bonding method in which the light emitting element 2 is connected to the lower surface of the light emitting element 2 by an electric connecting means such as a metal ball or a solder bump is used. The method that was used is used. Preferably, as shown in FIG. 2 and FIG. 3, the connection is made by a flip chip bonding method. Thereby, since the connection pad 1h can be provided immediately below the light emitting element 2, it is not necessary to provide a space for providing the connection pad 1h on the upper surface of the substrate 1 around the light emitting element 2. Therefore, it is possible to prevent the light emitted from the light emitting element 2 from being absorbed by the connection pad 1h of the base 1 and the on-axis luminous intensity from being lowered.

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

  The exposed surface of the connection pad 1h is preferably coated with a metal having excellent corrosion resistance, such as Ni or gold (Au), with a thickness of about 1 to 20 μm, so that the oxidation corrosion of the connection pad 1h is effective. In addition, the connection between the light emitting element 2 and the connection pad 1h can be strengthened. Therefore, for example, a 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 connection pad 1 h by an electrolytic plating method or an electroless plating method. More preferably.

  In addition, the base 1 may be formed by separately manufacturing the bottom 1a and the side wall 1b and joining them. In this case, an aluminum oxide sintered body, an aluminum nitride sintered body, a mullite sintered body, ceramics such as glass ceramics, a resin such as an epoxy resin, or a plate-like bottom portion 1a made of metal, The side wall 1b is attached by a bonding material 4 such as an epoxy resin or an acrylic resin, or a bonding material 4 such as a metal brazing material. Preferably, the bonding material 4 is made of a resin adhesive, and the bonding material 4 absorbs a difference in thermal expansion between the bottom portion 1a and the side wall portion 1b when the bonding material 4 is made of an elastic resin adhesive. It can relieve | moderate and it can prevent that damage, such as a crack, generate | occur | produces in the bottom part 1a or the side wall part 1b.

  The side wall portion 1b is formed such that the through hole is inclined toward the upper outer side in the central portion, and the inner peripheral surface 3b of the through hole is a reflecting surface that reflects light emitted from the light emitting element 2. ing. Then, the inner peripheral surface 3 b is attached to the upper surface of the bottom portion 1 a so as to surround the light emitting element 2.

  The side wall part 1b consists of a metal, ceramics, resin, etc., and is formed by performing a cutting process, metal mold forming, etc. Further, the reflecting surface formed on the inner peripheral surface 3b of the through hole is not particularly limited as long as it reflects light, but in order to obtain a higher reflectance, the inner peripheral surface 3b of the through hole may be polished. Smoothing by pressing a mold or the like, or, for example, Al, Ag, Au, platinum (Pt), titanium (Ti), chromium (Cr), A reflective surface is formed by forming a highly reflective metal thin film layer such as Cu. In addition, the shape of the through hole in plan view may be any of a polygon, a circle, and an ellipse.

  The inner peripheral surface 3b serving as the reflecting surface has, for example, a linear inclined surface as shown in FIGS. 2 and 3 whose longitudinal cross-sectional shape spreads outward as it goes upward, and outward as it goes upward. Examples of the shape include a curved curved inclined surface, for example, a parabolic surface where the position of the light emitting element 2 is a focal position, or a linear inclined surface whose inclination angle changes in the middle.

  As shown in FIGS. 1-3, the sheet-like 1st translucent member 5 containing fluorescent substance is mounted in the upper main surface 1f of the base | substrate 1 so that the opening of the recessed part 1c may be covered. The size of the first translucent member 5 in plan view is smaller than the size of the outer periphery of the base body 1 in plan view. 1 upper main surface 1f is exposed and arranged. The first translucent member 5 is placed so as to protrude from the upper main surface 1 f of the base 1. Thereby, the outer peripheral side surface 5a of the first translucent member 5 is disposed so that at least a part thereof is above the upper main surface 1f, and the outer peripheral side surface 5a and the upper main surface 1f are substantially perpendicular to each other. Facing to face each other. As described above, the light is emitted from the outer peripheral side surface 5 a of the first light transmissive member 5 so that the upper main surface 1 f of the base 1 around the first light transmissive member 5 is irradiated. Therefore, the light irradiated on the upper main surface 1 f is then reflected upward so that no shadow is generated around the first light transmissive member 5.

  The 1st translucent member 5 contains the fluorescent substance which is excited by the light which the light emitting element 2 emits to transparent resin, such as an epoxy resin and a silicone resin, and converts it into long wavelength fluorescence. The first translucent member 5 is molded by a mold and formed into a sheet shape similar to the outer peripheral shape of the upper main surface 1f of the base body 1 in plan view, or the first translucent member 5 The first transparent member 5 is formed in a similar shape to the outer peripheral shape of the upper main surface 1f by preparing a sheet-like transparent resin to be prepared in advance and performing punching using a punching die. Then, the sheet-like first translucent member 5 is placed on the upper side of the base 1 and fixed to be installed on the upper main surface 1f of the frame-like side wall 1b. By making the plan view shape of the first translucent member 5 similar to the plan view shape of the upper main surface 1f of the side wall portion 1b, shadows generated around the light emitting device can be reduced.

  Here, it is desirable that the first translucent member 5 has a constant thickness and that the granular phosphor is uniformly dispersed. Thereby, the light emitted from the light emitting element 2 can be efficiently wavelength-converted to the long wavelength side by the phosphor, and light having a desired wavelength spectrum can be obtained. Further, since the phosphor scatters a part of the light emitted from the light emitting element 2 to the adjacent phosphor, uniform fluorescence can be emitted from the first translucent member 5. The light whose wavelength has been converted by the phosphor is emitted in all directions from the phosphor, and is also emitted in all directions from the outer peripheral side surface 5a of the first translucent member 5.

  For the purpose of the present invention, it is preferable that at least the upper main surface 1 f of the substrate 1 is white with respect to the fluorescent color of the phosphor contained in the first light-transmissive member 5. That is, the upper main surface 1f is a surface that reflects as efficiently as possible without absorbing the fluorescence emitted by the first light-transmissive member 5. Moreover, it is preferable that the light emitted from the light emitting device does not substantially include the direct light of the light emitting element 2. That is, the light emitted from the light-emitting device is preferably fluorescence emitted by the phosphor contained in the first light-transmissive member 5. For example, in the case of a white light-emitting device, the first light-transmissive member 5 is used. Include phosphors emitting three primary colors such as red, blue, and green. Then, using the light emitting element 2 that emits blue light or ultraviolet light, the wavelength is converted to the longer wavelength side by the phosphor.

  Preferably, the width dimension B of the upper main surface 1f of the base 1 exposed around the first translucent member 5 is made uniform over the entire circumference. Thereby, the luminance of the upper main surface 1f arranged in a frame shape around the first light-transmissive member 5 can be made uniform in the circumferential direction of the upper main surface 1f. In addition, that the width dimension B is uniform over the entire circumference means that the width dimension should be constant so that the difference in luminance is not noticeable.

  More preferably, in FIG. 1, FIG. 2, and FIG. 3, the protruding dimension A from the upper main surface 1 f of the first translucent member 5 is exposed around the entire first translucent member 5. It is good to set it as 0.75 times or more of the width dimension B of the upper main surface 1f.

  FIG. 8 shows radiation to the light emitting surface side (upward) of the light emitting device of the present invention when the protruding dimension A of the first translucent member 5 is changed with respect to the width dimension B of the upper main surface 1f. The result of measuring the luminous flux of light is shown. In FIG. 8, as the protrusion dimension A increases, the amount of light emitted from the outer peripheral side surface 5a of the first light-transmissive member 5 and reflected by the upper main surface 1f of the substrate 1 increases. The luminous flux increases to the same extent as the width dimension B, and when the protrusion dimension A further exceeds the width dimension B, the light that is not reflected by the upper main surface 1f and does not go upward of the light emitting device increases. Therefore, it is considered that the relationship shows that the luminous flux gradually decreases.

  Then, from the result shown in FIG. 8, when the projection dimension A is 0.75 times the width dimension B of the upper main surface 1f, there is almost no visual difference with respect to the maximum luminous flux 1.32 (lm). It can be seen that 1.31 (lm) is reached. Therefore, it can be seen that, by setting the protrusion dimension A to be 0.75 times or more with respect to the width dimension B of the upper main surface 1f, it is practically possible to obtain a light emitting device that appears to emit light uniformly from the light emitting surface side. . The light flux tends to decrease rapidly as the protrusion dimension A decreases from 0.75 times. And it can use suitably in the range until the protrusion dimension A becomes a double size of the width dimension B. Furthermore, if the dimension of the protruding dimension A is equal to or larger than the width dimension B and is in the range of 1.4 times or less, a more preferable light emitting device can be obtained.

  As a result, as shown in FIG. 1, the light emitted from the outer peripheral side surface 5 a of the sheet-like first translucent member 5 containing the phosphor is first around the first translucent member 5. The light emitting device is reflected in all directions by the upper main surface 1f arranged in a frame shape so as to surround the translucent member of the light emitting device, and when the light emitting device is viewed from above, no shadow is generated around the light emitting device. A light emitting device that appears to emit light uniformly over the entire upper surface of the substrate can be obtained.

  Further, as shown in FIG. 3, a stepped portion 3 is preferably formed between the upper main surface 1f of the base 1 and the inner peripheral surface 1d. When the sheet-like first translucent member 5 containing a phosphor is placed on the inner bottom surface 3a of the stepped portion 3c, the first translucent member 5 is positioned by the inner side surface 3b of the stepped portion 3. It becomes easy to match. When the first translucent member 5 containing a phosphor is placed on the upper main surface 1f of the base 1, if the first translucent member 5 is displaced in the plane direction, the first translucent member 5 is placed. In some cases, the distribution of direct light from the light-emitting element 2 that passes through the light-sensitive member 5 and leaks out of the first light-transmissive member 5 becomes uneven, and color tone abnormality may occur.

  The step portion 3 has an inner bottom surface 3a formed in parallel with the upper main surface 1f of the base 1 and an inner side surface 3b formed perpendicular to the inner bottom surface 3a. That is, the stepped portion 3 is formed so as to cut out the inner peripheral surface 3 b at a right angle, so that the outer peripheral side surface 5 a of the sheet-like first light-transmissive member 5 extends along the inner side surface 3 b of the stepped portion 3. Then, the first translucent member 5 can be accurately aligned by the inner side surface 3b of the stepped portion 3 and placed on the bottom surface 3a.

  Moreover, when such a step portion 3 is formed, when the second translucent member 6 is injected into the recess 1 c of the base body 1, the second translucent member 6 is the inner bottom surface of the step portion 3. 3a as a mark, it can be injected into the inside of the recess 1c so as not to exceed the inner bottom surface 3a, the work efficiency when injecting the second translucent member 6 using a dispenser or the like can be improved, The second translucent member 6 can be injected almost exactly by a predetermined amount.

  Further, by forming the stepped portion 3 on the upper side of the inner peripheral surface 1d, the inner bottom surface 3a prevents the second translucent member 6 that tends to wet and spread so as to scoop up on the inner peripheral surface 1d. And the surface shape of the upper surface of the second translucent member 6 injected into the inside of the recess 1c can be stabilized. As a result, the emission angle of the light emitted from the light emitting element 2 from the upper surface of the second translucent member 6 can be made constant, and from the upper surface of the second translucent member 6. The light emission intensity can be made constant without variation in the output of the emitted light.

  Further, the inner surface 3 b is formed to be slightly larger than the outer shape of the first light transmissive member 5 in plan view. The corners of the inner side surface 3b are connected with a chamfered shape such as an arc or a straight line so that no corner is formed between the surfaces of the inner side surfaces 3b adjacent to each other. When the first translucent member 5 is placed on the step portion 3, a gap 8 is provided between the outer peripheral side surface 5 a of the first translucent member 5 and the inner side surface 3 b of the step portion 3. The corner of the first translucent member 5 may be lightly brought into contact with the corner provided in the chamfered shape of the stepped portion 3. The gap 8 has a size such that the outer peripheral side surface and the inner side surface 3b of the first translucent member 5 do not come into contact with each other due to a difference in thermal expansion in the operating temperature range. What is necessary is just about 0.1 mm.

  Accordingly, if the first translucent member 5 is inserted from the upper surface of the stepped portion 3, the first translucent member 5 can be easily aligned and the light emitting element 2 can be operated when the light emitting element 2 is operated. Even if a difference in thermal expansion occurs between the substrate 1 and the first translucent member 5 due to heat generated from the substrate, the difference in thermal expansion can be absorbed by the gap 8 and the sheet-like first transparent member can be absorbed. It is possible to prevent the light member 5 from warping and the first light transmissive member 5 from being peeled from the base 1. Further, the first translucent member 5 is not deformed so as to be compressed, and the density of the phosphor contained therein is not uneven. Therefore, it is possible to effectively prevent unevenness in the intensity of light emitted from the light emitting device.

  The stepped portion 3 and the inner bottom surface 3a are provided integrally with the base 1 or the side wall 1b of the base 1, and are formed by performing cutting or molding when the base 1 or the side wall 1b of the base 1 is manufactured. Is done. Alternatively, the side wall portion 1b is formed as a separate upper and lower body with the stepped portion 3 as a boundary, and these are stacked and joined.

  Preferably, as shown in FIGS. 2 and 3, a second light-transmissive member 6 is disposed in the recess 1 c so as to cover the light emitting element 2. The second translucent member 6 is formed by pouring an uncured liquid material onto the upper surface of the light emitting element 2 using an injection machine such as a dispenser and then curing the liquid. By providing the second translucent member 6, the light emitting element 2 can be protected and light emitted from the light emitting element 2 can be easily guided to the outside.

  That is, when the second translucent member 6 is not filled, light is emitted from the light emitting element 2 into the air in the recess 1c, and the difference between the refractive index of the light emitting element 2 and the refractive index of air. The light emitted from the light emitting element 2 may return to the inside of the light emitting element 2 in some cases. When the second light-transmissive member 6 is filled, the second light-transmissive member 6 has a refractive index between the refractive index of the light-emitting element 2 and the refractive index of air. The emitted light can be easily led out of the light emitting element 2.

  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 for the second light transmissive member 6. The same material as the first translucent member 5 or a different kind of material may be used. The light emitted from the upper surface of the first translucent member 5 and the light emitted from the outer peripheral side surface 5a of the first translucent member 5 should have the same intensity and the same color. Since it is preferable, it is preferable that the phosphor is included only in the first translucent member 5, and the second translucent member 6 is preferably made of a transparent resin or glass.

  Here, preferably, the thickness of the second translucent member 6 is not less than twice the thickness of the light emitting element 2. Thereby, the 2nd translucent member 6 is reliably provided in the surface of the light emitting element 2, and it can make it easy to guide the light which the light emitting element 2 emits to the exterior of the light emitting element 2. FIG. When the thickness of the second light-transmissive member 6 is less than twice the thickness of the light-emitting element 2, the surface of the light-emitting element 2 is caused by variation in the amount generated when pouring the upper surface of the light-emitting element 2 with an injection machine such as a dispenser. There is a risk that the second translucent member 6 is not provided.

  Further, as shown in FIGS. 2 and 3, the sheet-like first translucent member 5 containing the phosphor is disposed on the upper main surface 1 f of the base 1 on the outer peripheral side surface 5 a, and the third translucent member 7. It is good that it is fixed by. The first translucent member 5 is firmly fixed to the upper main surface 1f of the base body 1 by the third translucent member 7, and the third translucent member 7 is a sheet containing a phosphor. The light emitted from the outer peripheral side surface 5 a of the first translucent member 5 is guided to the upper main surface 1 f disposed over the entire circumference of the first translucent member 5. Accordingly, the amount of light applied to the upper main surface 1f increases, and the upper main surface 1f can be made brighter.

  Further, when the projecting dimension A of the first translucent member 5 and the width dimension B of the upper main surface 1f are approximately the same size, the surface of the third translucent member 7 is the first translucent member 7. From the upper end of the outer peripheral side surface 5a of the light-sensitive member 5 to the outer peripheral end of the upper main surface 1f, the average inclined surface is 45 °, and light emitted from the outer peripheral side surface 5a of the first light-transmissive member 5 is guided to the upper main surface 1f. Can enhance the effect.

  The third light transmissive member 7 preferably does not contain a phosphor. This is because if the phosphor is contained in the third translucent member 7, when the third translucent member 7 is poured onto the upper main surface 1 f of the substrate 1, a color tone change such as precipitation occurs and the color tone varies. It is because it becomes easy to happen. In addition, there is a method of curing by taking time into consideration in consideration of precipitation, but the uncured third translucent member 7 flows to the outer peripheral portion of the base 1, resulting in variation in color tone. Sometimes.

  In the light emitting device of the present invention, as shown in FIG. 4, the substrate 1 is preferably provided with a chamfered portion 1 g at at least one of the outer peripheral corners of the substrate 1 in plan view. This is because when the light emitting device is mounted on the external electric circuit board, it is a mark for easily discriminating the mounting direction of the light emitting device with respect to the positive electrode and the negative electrode provided on the external electric circuit board. It is sufficient that the chamfered portion 1g is provided at one place on the outer peripheral corner portion of the base 1.

  Further, as shown in FIG. 4, in the light emitting device, the outer peripheral shape of the substrate 1 in a plan view may be a polygon having opposite sides parallel to each other, for example, a rectangle, a square, a hexagon, or the like. As a result, a plurality of light emitting devices can be arranged adjacent to each other so as to be spread without gaps and mounted on the drive unit, and a surface emitting illumination device can be obtained.

  The lighting device of the present invention includes a substrate having a light emitting device mounted thereon and having an electrical wiring for driving the light emitting device, and a light emitting device having the above-described configuration that is arranged in a plurality so as to be adjacent to each other and mounted on the substrate. . Thereby, it is possible to provide a surface emitting illumination device in which the entire light emitting surface emits light uniformly in the direction in which the light emitting elements are arranged.

  For example, as shown in FIG. 5, when a plurality of light emitting devices are arranged in a row on a drive unit such as a circuit board, a continuous linear light source is lit along the row of light emitting devices. Looks like. Note that when the light emitting device is mounted using a mounting machine, it is necessary to provide some space between the light emitting devices.

  Further, as shown in FIG. 6, a convex portion 9 is provided on one side of the outer peripheral portion of the substrate 1, a concave portion 10 is provided on a parallel side opposite to the one side, and a plurality of the light emitting devices are arranged in a line. By arranging the convex portions 9 of the light emitting devices adjacent to the concave portions 10 to be fitted, it becomes easy to connect the light emitting devices in a row. Moreover, the convex part 9 and the recessed part 10 can be used also as a mark which determines the mounting direction of a light-emitting device.

  Furthermore, if the light emitting devices arranged in a single row are arranged so as to be adjacent to each other in a plurality of rows, a lighting device that appears to emit light in a planar shape can be obtained. 5 and 6 show the case where the outer peripheral shape of the light emitting device is a square. For example, the light emitting device has a hexagonal shape, and is provided with convex portions 9 on one side and two sides adjacent thereto, and two sides facing these sides. It is also possible to provide the recesses 10 in the arrangement and arrange them so as to be spread in a flat shape so that the projections 9 and the recesses 10 are fitted. When the hexagonal light emitting devices are arranged in this way, the light emitting devices arranged in a row are arranged between the light emitting devices arranged in adjacent rows, as in a so-called staggered arrangement. It can be set as the illuminating device which seems to be more uniform surface light emission.

  5 and 6, a light emitting device that emits warm color light (warm color light emitting device) and a light emitting device that emits daylight color light (light that looks a little bluish). And daylight color light emitting devices) may be arranged alternately. In this case, the warm color light emitting device and the daylight color light emitting device are connected to a circuit as shown in FIG. 7, for example. Then, the daylight color light emitting device emits light by turning on the GND1, and the warm color light emitting device emits light by turning on the GND2. Further, when both the GND1 and GND2 switches are turned on, both the daylight color light emitting device and the warm color light emitting device emit light, and it appears that an intermediate color between the daylight color system and the warm color light is emitted. That is, by using a circuit as shown in FIG. 7, an illuminating device capable of emitting light in three patterns of color tone is obtained.

  5 to 7, D represents a diode, and R represents a resistance. As shown in FIG. 7, the diode D is connected in parallel in the reverse direction to the light emitting devices connected in the forward direction. This prevents an overvoltage from being applied to the light emitting device, and prevents the light emitting element 2 mounted on the light emitting device from being electrically damaged. In addition, as shown in FIG. 7, the resistor R is connected in series with the light emitting device, so that the current flowing through the light emitting device can be stabilized and the light emission intensity of the light emitting device can be constant.

  The warm color light emitting device and the daylight color light emitting device can be manufactured by changing the composition of the phosphor contained in the first light transmissive member 5. In addition, by using a light emitting device that emits red, blue, and green fluorescent colors, the lighting device of the present invention can be a color display.

The illumination device is above the first light transmitting member of a light emitting device as a light-emitting surface, the transparent ultraviolet Kattofu I Lum (not shown) may be provided so as to cover the light-emitting device. Thereby, the ultraviolet rays contained in the light emitted from the light emitting element can be shielded. For example, it can be prevented by the use of a lighting device provided with an ultraviolet Kattofu I Lum as for exhibition lighting fixture, that the ultraviolet deterioration of sunburn to exhibit results.

  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.

  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-emitting device of this invention. It is sectional drawing which shows the example of embodiment in the X-X 'surface of the light-emitting device of FIG. It is sectional drawing which shows the other example of embodiment in the X-X 'surface of the light-emitting device of FIG. It is a top view which shows the other example of embodiment of the light-emitting device of this invention. It is a top view which shows an example of embodiment of the illuminating device of this invention. It is a top view which shows the other example of embodiment of the illuminating device of this invention. It is a circuit diagram which shows an example of embodiment of the illuminating device of this invention. It is a diagram which shows the result of having measured the light beam discharge | released from the light-emitting device of this invention. It is sectional drawing which shows the example of embodiment of the conventional light-emitting device.

Explanation of symbols

1: Base 1a: Bottom 1b: Side wall 1c: Recess 1d: Inner peripheral surface 1e: Mounting portion 1f: Upper main surface 1g: Chamfered portion 2: Light emitting element 3: Stepped portion 3a: Inner bottom surface 3b (of the stepped portion): Inner side surface (of stepped portion) 5: first translucent member 5a: outer peripheral side surface (of first translucent member) 6: second translucent member 7: third translucent member 8: Gap

Claims (9)

A base provided with a recess for accommodating the light emitting element on the upper main surface;
A light emitting element mounted in the recess;
A sheet-like translucent member containing a phosphor disposed above the light emitting element, and the sheet-like translucent member is installed so as to protrude upward from the upper main surface of the base. And in plan view, the size of the sheet-like translucent member is made smaller than the size of the base,
A translucent member is disposed between an outer peripheral side surface of the sheet-like translucent member and an upper main surface of the base body, and the sheet-like translucent member and the base body are fixed by the translucent member. And
A light emitting device characterized in that light emitted from an outer peripheral side surface of the sheet-like translucent member is irradiated to an upper main surface of the substrate around the recess. Projecting distance from the upper major surface of the base of the sheet-like translucent member, or 0.75 times the width dimension from the outer peripheral side surface of said sheet-like light-transmitting member to the outer peripheral edge of the upper major surface of the substrate The light emitting device according to claim 1, wherein: The recess opening of the base, the recess step portion is provided so as to extend outwardly, claim 1 or claim, wherein the sheet-like light-transmitting member to the step portion is placed Item 3. A light emitting device according to Item 2 . The light emitting device according to claim 3 , wherein a gap is provided between an outer peripheral side surface of the sheet-like translucent member and an inner side surface of the stepped portion. The light emitting device according to any one of claims 1 to 4 , wherein the base is provided with a chamfered portion at a corner in plan view. The light emitting device light emitting device according to any one of claims 1 to 5, wherein the sides facing are parallel polygonal in plan view. 7. The light emitting device according to claim 6 , wherein a convex portion is provided on one of the opposite sides of the base body, and a concave portion is provided on the other side of the substrate to be fitted with the convex portion of an adjacent light emitting device. apparatus. A light emitting device according to claim 1 to claim 7, wherein arranged such plurality is adjacent, the lighting apparatus characterized by comprising a substrate having an electrical wiring for driving the light emitting device. Lighting apparatus according to claim 8, wherein the ultraviolet Kattofu I Lum is provided above the sheet-shaped translucent member of the light emitting device.

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