JP2014107495A - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device which can reduce manufacturing time.SOLUTION: A light-emitting device 100 comprises a plurality of light-emitting elements 1, a substrate 2, encapsulation parts 31 for encapsulating the light-emitting elements 1 and intermediate parts 32 provided between adjacent encapsulation parts 31. A plurality of light-emitting groups each including the plurality of light-emitting elements 1 arranged in a row are arranged at a distance from each other. Each encapsulation part 31 covers each light-emitting element group and is formed in a line shape so as to cover the light-emitting elements 1 arranged in a row in each light-emitting element group. Each intermediate part 32 is formed in a state of being extended from the encapsulation parts 31 which cover the adjacent light-emitting element groups.

Description

  The present invention relates to a light emitting device in which a plurality of light emitting elements are mounted on a substrate.

  LEDs (light-emitting diodes) are used in a wide range of applications such as lighting fixtures, lighting switches, backlight light sources, illumination light sources, and amusement equipment decorations due to their small size, power saving, and long life.

  Moreover, light of any color tone can be obtained by converting the wavelength of light emitted from the light emitting element (LED chip) using a phosphor, and LEDs having various emission colors are used depending on the application. .

  For example, in such an LED, an insulating ring-shaped wall portion is formed on a substrate, and one or a plurality of light emitting elements are provided in the wall portion. Then, a transparent or translucent resin body having translucency for sealing the light emitting element in the wall portion is filled so as to be substantially parallel to the height of the wall portion (see Patent Document 1).

JP 2011-82285 A

  In the conventional LED like Patent Document 1, it is necessary to form a wall portion on the substrate before sealing the light emitting element. In order to form such a wall portion, it is necessary to form a thermosetting synthetic resin in a ring shape at a predetermined position on the substrate and then heat and cure the synthetic resin for a required time. .

  The present invention has been made in view of such circumstances, and an object thereof is to provide a light-emitting device capable of shortening the manufacturing time.

  A light-emitting device according to a first aspect of the present invention is a light-emitting device having a plurality of light-emitting elements mounted on a substrate, wherein a plurality of light-emitting element groups in which a plurality of light-emitting elements are arranged are spaced apart from each other, and each light-emitting element group is sealed. A stop portion and an intermediate portion extending from the sealing portion are provided between adjacent light emitting element groups.

  The light emitting device according to a second invention is characterized in that, in the first invention, the ratio of the thickness of the intermediate portion to the thickness of the sealing portion is in the range of 0.6 to 0.8.

  A light emitting device according to a third invention is characterized in that, in the first invention or the second invention, the sealing part and the intermediate part contain a phosphor.

  In the first invention, a plurality of light emitting element groups in which a plurality of light emitting elements are arranged are arranged apart from each other. That is, the light emitting element group is, for example, a plurality of light emitting elements arranged in a line, and the plurality of light emitting element groups are arranged separately on the substrate. Note that the column shape includes not only a straight line shape but also a curved line. The sealing portion covers each light emitting element group and is formed so as to cover the light emitting elements arranged in a row. The intermediate part is extended from the sealing part which covers the adjacent light emitting element group. For example, when a plurality of light emitting elements are arranged in a line to form a light emitting element group, and each light emitting element group is arranged in parallel in a line shape, the light emitting elements are arranged in the sealing portion by a dispenser. It can be formed by applying a sealing resin in a line along the direction. The line shape includes not only a linear shape but also a curved line. In addition, the intermediate portion is arranged in the column direction on the substrate by appropriately setting parameters such as the amount of sealing resin when forming the sealing portion, the movement speed of the dispenser, and the discharge pressure of the resin. It spreads in the direction which crosses, and adjacent sealing parts can be connected and an intermediate part can be formed. Since it is not necessary to form a light receiving element and a wall portion that houses a resin body that covers the light emitting element, manufacturing time can be shortened. In addition, by providing the intermediate portion, it is possible to suppress the variation of the color temperature with respect to the light emission angle.

  In the second invention, the ratio α of the thickness of the intermediate portion to the thickness of the sealing portion is in the range of 0.6 to 0.8. The thickness of a sealing part and an intermediate part is a height dimension from a board | substrate. For example, the thickness of the sealing part can be the maximum height dimension, and the thickness of the intermediate part can be the minimum height dimension. The emission angle θ is 0 when the traveling direction of light emitted from the light emitting element is perpendicular to the substrate surface, and the emission angle θ is 90 degrees when parallel to the substrate surface. .

  For example, when the ratio α exceeds 0.8, as an example, when the heights of the sealing portion and the intermediate portion are the same dimension (ratio α = 1), the light emitted from the light emitting element is emitted at an emission angle θ. As the size of the sealing portion increases, it is totally reflected on the inner surface of the sealing portion or the intermediate portion when going outward (air) from the sealing portion or the intermediate portion, and the sealing portion until it is discharged from the sealing portion or the intermediate portion. And the distance which moves in the middle part becomes long. For this reason, as the emission angle θ increases, a relatively large variation occurs in the color temperature of the emitted light. Further, when the ratio α is less than 0.6, for example, when there is no intermediate portion (ratio α = 0), that is, when adjacent sealing portions are separated from each other, the light is emitted from the light emitting element. As the emission angle θ increases, the light is refracted so as to become more parallel to the surface of the substrate due to the difference in refractive index when going outward (air) from the sealing portion. The distance traveled in the sealing portion before entering the sealing portion and being released from the sealing portion becomes longer. For this reason, as the emission angle θ increases, a relatively large variation occurs in the color temperature of the emitted light.

  By setting the ratio α within the range from 0.6 to 0.8, even when the light emission angle θ is large, the light emitted from the light emitting element travels from the sealing portion to the intermediate portion. Due to the difference in refractive index between the part and air, it is possible to suppress the situation where light is refracted so that the traveling direction of light approaches the substrate surface. Moreover, since the heights of the sealing portion and the intermediate portion are not the same but different, it is possible to suppress total reflection on the inner surface of the sealing portion, and it is possible to suppress variation in color temperature with respect to the emission angle.

  In the third invention, the sealing portion and the intermediate portion contain a phosphor. By setting the type, concentration, etc. of the phosphor to the required ones, light having a required color temperature can be obtained.

  According to the present invention, the manufacturing time can be shortened. In addition, variation in color temperature with respect to the light emission angle can be suppressed.

It is a top view which shows an example of a structure of the light-emitting device of this Embodiment. It is principal part sectional drawing which shows an example of a structure of the light-emitting device of this Embodiment. It is a schematic diagram which shows an example of a structure of a discharge apparatus. It is a schematic diagram which shows an example of the mode of discharge of a liquid material. It is a schematic diagram which shows an example of the mode of advancing of the light of the light-emitting device of this Embodiment. It is a schematic diagram which shows an example of the mode of the light advance of the light-emitting device of the comparative example 1. It is a schematic diagram which shows an example of the mode of advancing of the light of the light-emitting device of the comparative example 2. It is explanatory drawing which shows an example of the relationship between the color temperature of the light-emitting device of this Embodiment, and an emission angle. It is explanatory drawing which shows the other example of the relationship between the color temperature of the light-emitting device of this Embodiment, and an emission angle. It is a top view which shows an example of the other structure of the light-emitting device of this Embodiment. It is a top view which shows an example of the other structure of the light-emitting device of this Embodiment. It is a top view which shows an example of the other structure of the light-emitting device of this Embodiment. It is a top view which shows the 2nd example of the shape of the board | substrate of a light-emitting device, and arrangement | positioning of a light emitting element. It is a top view which shows the 3rd example of the shape of the board | substrate of a light-emitting device, and arrangement | positioning of a light emitting element. It is a top view which shows the 4th example of the shape of the board | substrate of a light-emitting device, and arrangement | positioning of a light emitting element. It is a top view which shows the 5th example of the shape of the board | substrate of a light-emitting device, and arrangement | positioning of a light emitting element.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is a plan view showing an example of the configuration of the light-emitting device 100 of the present embodiment, and FIG. 2 is a cross-sectional view of the main part showing an example of the configuration of the light-emitting device 100 of the present embodiment. The light emitting device 100 includes a plurality of light emitting elements 1, a substrate 2, a sealing portion 31 that seals the light emitting elements 1, an intermediate portion 32 that is formed between adjacent sealing portions 31, and the like.

  The substrate 2 has a rectangular shape, and the material of the substrate 2 is glass epoxy, ceramics, aluminum or the like, but is not limited thereto. A plurality of light emitting elements (LED chips) 1 are mounted on the substrate 2. In the example of FIG. 1, 7 × 7 = 49 light emitting elements 1 are arranged for simplicity, but the number of light emitting elements 1 is not limited to the example of FIG.

  In the example of FIG. 1, there are seven light emitting element groups in which a plurality (seven) of light emitting elements 1 are arranged in a row, and the respective light emitting element groups are spaced apart from each other and arranged in parallel. Note that the column shape includes not only a straight line shape but also a curved line. In one light emitting element group, the light emitting element 1 is connected to a wiring 4 formed on the substrate 2 by a wire (not shown). In addition, the several light emitting element 1 which comprises one light emitting element group may be connected in series, and may be connected in parallel. Moreover, each light emitting element group may be connected in series, and may be connected in parallel.

  The light emitting element 1 is, for example, an LED chip that emits blue light, but the light emission color is not limited to blue, and may be another color. The light-emitting element 1 may be one in which an electrode formed on the surface of the light-emitting element 1 and a wiring are connected by a wire, or a surface mounting in which the electrode formed in the light-emitting element 1 is soldered to an electrode on the wiring It may be of type.

  The sealing portion 31 covers each light emitting element group, and is formed in a line shape so as to cover the light emitting elements 1 arranged in a line in each light emitting element group. That is, the center line of the row of the light emitting elements 1 and the center line of the sealing portion 31 formed in a line shape are the same. The line shape includes not only a linear shape but also a curved line. The intermediate portion 32 does not directly cover the light emitting element 1 but is formed in a state extending from the sealing portion 31 covering the adjacent light emitting element group.

  The lengths of the sealing portion 31 and the intermediate portion 32 are slightly shorter than the length of the substrate 2. Moreover, when the separation dimension of the adjacent light emitting elements 1 is 3 mm, for example, when the width of the sealing part 31 is, for example, about 2 to 2.5 mm, the width of the intermediate part 32 is, for example, 1 It can be about -0.5 mm. The width decreases as the thickness (height) dimension of the intermediate portion 32 increases.

  The sealing portion 31 can be formed, for example, by applying a sealing resin in a line along a direction in which the light emitting elements 1 are arranged in a line by a discharge device such as a dispenser. In addition, the intermediate portion 32 is configured so that the sealing portion 31 can be set by appropriately setting parameters such as the amount of the liquid material for sealing when the sealing portion 31 is formed, the moving speed of the nozzle, and the discharge pressure of the liquid material. The intermediate portion 32 can be formed by spreading in the direction intersecting the column direction on the substrate 2 and connecting the adjacent sealing portions 31 to each other.

  As shown in FIG. 2, the sealing portion 31 directly covers the light emitting element 1, and the cross-sectional shape is a convex curved surface. More specifically, the cross-sectional shape on the long side of the sealing portion 31 is a long and narrow rectangular shape (a long and narrow rectangular shape in which both sides are convexly curved), and the cross-sectional shape on the short side is a convex curved surface. . Moreover, the intermediate part 32 is formed between the adjacent sealing parts 31, and cross-sectional shape is a concave curved surface or a plane. Further, assuming that the thickness (height dimension) of the sealing portion 31 is d1, and the thickness (height dimension) of the intermediate portion 32 is d2, the relationship d1> d2 is established. In addition, the thickness d1 of the sealing part 31 can be made into the maximum value of thickness, and the thickness d2 of the intermediate part 32 can be made into the minimum value of thickness. Moreover, the cross-sectional shape shown in FIG. 2 is a schematic representation, and is not limited to the shape illustrated in FIG. The intermediate portion 32 is formed by connecting adjacent line-shaped sealing portions 31 to each other, and thus can be regarded as a sealing portion.

  Next, a method for forming a sealing portion in a line shape on the substrate 2 will be described. FIG. 3 is a schematic diagram illustrating an example of the configuration of the ejection device 200. The discharge device 200 is a device that discharges a liquid material to the light emitting element 1 on the substrate 2. As the liquid material, as the sealing resin for sealing the light emitting element 1, for example, a phosphor can be used, and an epoxy resin or a mixture of an epoxy resin and a silicon resin can be used. It is not limited to. Further, the term “ejection” includes meanings such as ejection, application, filling, and potting of a liquid material.

  As shown in FIG. 3, in the ejection device 200, the substrate 2 on which the light emitting element 1 is mounted is placed on a placement table (not shown).

  An apparatus main body 210 is disposed above the substrate 2, and the apparatus main body 210 can be two-dimensionally moved in the horizontal direction with respect to the substrate 2 as indicated by an arrow in FIG. . By moving the apparatus main body 210 in the horizontal direction, the tip portions 204 and 206 of nozzles 203 and 205 described later, the probe 212 of the optical property measuring unit 211, and the light receiving unit 214 of the measuring unit 213 described below are disposed above the light emitting element 1. Can be arranged. In addition, it can replace with the structure which drives the apparatus main body 210 to a horizontal direction (lateral direction), and can also be set as the structure which drives a mounting base in a horizontal direction.

  In the apparatus main body 210, a nozzle 203 is suspended and a syringe 202 is fixed. Further, a nozzle 205 is suspended from the apparatus main body 210 and a syringe 209 is fixed. A pressure pipe 207 is connected to the syringe 202, and a predetermined amount of liquid material is discharged from the nozzle 203 by pressurizing the liquid surface of the liquid material in the syringe 202 with pressurized air from a not-shown pressurizing source. The Further, a pressure pipe 208 is connected to the syringe 209, and a predetermined amount of liquid material is supplied from the nozzle 205 by pressurizing the liquid surface of the liquid material in the syringe 209 with pressurized air from a pressurization source (not shown). Discharged. The discharge amount of the liquid material is controlled by the control unit 10.

  For example, the syringe 202 stores a liquid material containing a red phosphor, and the syringe 209 stores a liquid material containing a yellow phosphor, for example. The red phosphor is excited by light emitted from the blue light emitting element and has, for example, a light emission peak at a wavelength of 600 to 650 nm, but the light emission peak is not limited thereto. In addition, an appropriate material can be used for the red phosphor. The yellow phosphor is excited by light emitted from the blue light emitting element and has a light emission peak at a wavelength of 560 to 600 nm, for example, but the light emission peak is not limited thereto. Further, as the material of the yellow phosphor, an appropriate material can be used.

  The type of phosphor is not limited to red and yellow, but may be green or a combination of green and red. Further, a liquid material containing no phosphor can also be used. By setting the type, concentration, etc. of the phosphor to the required ones, light having a required color temperature can be obtained. In the example of FIG. 3, the configuration includes two syringes 202 and 209, but the number of syringes is not limited to two, and may be one or three or more. Moreover, it replaces with the structure which divides fluorescent substance for every syringe, and may mix one or more types of fluorescent substance beforehand, and may use one syringe.

  A measuring unit 213 that measures the amount of liquid material discharged from the nozzles 203 and 205 to the light emitting element 1 is fixed to the apparatus main body 210. As the measurement unit 213, for example, an optical displacement meter including a spectroscopic unit, a fiber, a light receiving unit 214, and the like can be used.

  The optical property measuring unit 211 has a function of measuring the property value of the light emitting element 1. The optical characteristic measurement unit 211 includes a probe 212, receives light from the light emitting element 1, and measures an optical characteristic value. Examples of the optical characteristics include chromaticity coordinates (x, y), light emission spectrum (spectral spectrum), light intensity, dominant wavelength, and color temperature of the light emitting element 1.

  The adjustment unit 201 includes a driving mechanism such as a cylinder, and adjusts the distance between the tip portions 204 and 206 of the nozzles 203 and 205 and the light emitting element 1 by moving the apparatus main body 210 up and down.

  The control unit 10 controls the discharge of the liquid material from the nozzles 203 and 205. The control unit 10 adjusts the moving speed of the nozzles 203 and 205, the discharge pressure of the liquid material, the discharge amount of the liquid material, and the like.

  FIG. 4 is a schematic diagram showing an example of a state of discharging a liquid material. FIG. 4 shows a case where one syringe is used. As shown in FIG. 4, the distance between the tip 204 of the nozzle 203 and the surface of the substrate 2 or the distance from the light emitting element 1 is set to a required value. The liquid material 300 is discharged at a required pressure and discharge amount while moving the tip portion 204 of the nozzle 203 in a line form from the light emitting element 1 at the end of the light emitting element group (also referred to as line potting). After the tip portion 204 of the nozzle 203 is moved, the sealing member 3 (which becomes the sealing portion 31 after being cured) is formed in a line shape with a desired width and height.

  In order to form the sealing portion 31 and the intermediate portion 32 in the form illustrated in FIG. 1, for example, while discharging the liquid material 300 from the tip portion 204 of the nozzle 203 of the discharge device 200, Is moved in a direction parallel to one side of the substrate 2 (a direction in which the light emitting elements 1 are arranged in a row), and is moved to the other end of the light emitting element group. Next, similarly, it is moved from one end of the light emitting element group in the adjacent row in a direction parallel to one side of the substrate 2 (direction in which the light emitting elements 1 are arranged in a line), and to the other end of the light emitting element group. Move. By repeating this operation, the sealing member 3 is potted in a line so as to cover the light emitting element group on the substrate 2. Adjacent sealing members 3 potted in a line form are spread and connected in the width direction (direction perpendicular to the moving direction of the tip portion 204 of the nozzle 203) to form an intermediate portion before curing. In order to form the intermediate portion 32, the discharge amount of the liquid material 300, the moving speed of the nozzle 203, and the like may be adjusted according to the separation interval (pitch) of the light emitting element 1.

  That is, similarly to the other light emitting element group that is positioned next to the light emitting element group that has ejected (line-potted) the liquid material 300, the tip portion 204 of the nozzle 203 is connected to the light emitting element 1 at the end of the light emitting element group. The liquid material 300 is discharged at a required pressure and discharge amount while moving in a line shape. Depending on the viscosity of the discharged liquid material, the liquid adjacent sealing member 3 spreads in the width direction, and both are connected.

  In order to form the intermediate portion 32, first, the liquid material 300 is potted in a line shape so as to cover the light emitting element group on the substrate 2, and then, between the liquid sealing members 3 potted in the line shape. May be potted again in a line shape by reducing the discharge amount of the liquid material 300 in parallel with the direction in which the light emitting elements 1 are arranged in a line.

  After discharging the liquid material to all the light emitting elements 1 on the substrate 2, the sealing member 31 and the intermediate part 32 are formed by curing the sealing member 3 by heating at a predetermined temperature for a predetermined time. The

  As described above, in the present embodiment, regardless of whether or not the sealing portion 31 and the intermediate portion 32 contain a phosphor, a wall portion that houses the light emitting element and the sealing member that covers the light emitting element is formed. Since it is not necessary, the step of forming the wall portion and the step of hardening the wall portion are unnecessary, and the manufacturing time can be shortened.

  Next, the relationship between the color temperature and the light emission angle of the light emitting device 100 of this embodiment will be described. Here, the emission angle refers to a direction perpendicular to the surface of the substrate 2 of the light emitting device 100 as 0 degree and a direction parallel to the surface of the substrate 2 as 90 degrees (or -90 degrees).

  FIG. 5 is a schematic diagram illustrating an example of a state of light travel of the light emitting device 100 according to the present embodiment. As shown in FIG. 5, the light emitting device 100 according to the present embodiment covers the light emitting elements 1 arranged in a row and includes a sealing portion 31 formed in a line shape and an intermediate portion formed between the sealing portions 31. Part 32. The sealing part 31 and the intermediate part 32 contain a required phosphor. By containing the phosphor, the color temperature of the light emitted from the light emitting device 100 can be set to a desired value (for example, 4900K).

  The color temperature of the light changes according to the movement distance of the light in the region containing the phosphor (sealing portion and intermediate portion). For example, the color temperature increases as the moving distance in the region including the phosphor decreases, and conversely, the color temperature decreases as the moving distance in the region including the phosphor increases.

  As shown in FIG. 5, when the emission angle of the light emitted from the light emitting element 1 is 0 degree (direction indicated by the symbol A in FIG. 5), the color temperature of the light emitted from the light emitting device is a predetermined value. Become.

  On the other hand, when the emission angle of the light emitted from the light emitting element 1 is increased (the direction indicated by the symbol B in FIG. 5), the movement distance of the light within the region (sealing portion and intermediate portion) containing the phosphor. However, since the emission angle is longer than when the emission angle is 0 degree (reference A), the color temperature of the emitted light is lowered.

  However, in the light emitting device 100 according to the present embodiment, the height of the sealing portion that covers the light emitting element 1 is not uniform, and the intermediate portion 32 that is smaller in thickness (height) than the sealing portion 31 that covers the light emitting element 1. Therefore, it is possible to prevent the color temperature from decreasing as the emission angle θ increases. Hereinafter, this point will be described.

  FIG. 6 is a schematic diagram illustrating an example of a state of light traveling in the light emitting device of Comparative Example 1. A comparative example 1 shown in FIG. 6 is equivalent to the one disclosed in Patent Document 1. A link-shaped or rectangular wall portion is formed on the substrate 52, and a plurality of light emitting elements 51 are mounted inside the wall portion. And the resin part 53 which seals the light emitting element 51 is filled inside the wall part. The thickness (height) of the resin portion 53 is uniform and has the same dimensions as the wall portion.

  As shown in FIG. 6, when the emission angle of the light emitted from the light emitting element 51 is 0 degree (direction indicated by the symbol A in FIG. 6), the color temperature of the light emitted from the light emitting device is a predetermined value. Become.

  On the other hand, when the emission angle of the light emitted from the light emitting element 51 becomes large (the direction indicated by the symbol B in FIG. 6), the light emitted from the light emitting element 51 travels outside (air) from the resin portion 53. Since the total reflected light is reflected by the inner surface of the resin portion 53 and the totally reflected light is reflected by the surface of the substrate 52 and moves again within the resin portion 53, the resin portion 53 is finally released from the resin portion 53. It is thought that the distance to move in becomes longer. For this reason, as the emission angle θ increases, a relatively large variation occurs in the color temperature of the emitted light.

  FIG. 7 is a schematic diagram illustrating an example of a light traveling state of the light emitting device of Comparative Example 2. The comparative example 2 shown in FIG. 7 is mounted on the substrate 62, covers the light emitting elements 61 arranged in a row, and has a sealing portion 63 formed in a line shape. The cross-sectional shape on the long side of the sealing portion 63 is an elongated rectangular shape, and the cross-sectional shape on the short side is a convex curved surface. Adjacent sealing portions 63 are separated from each other, and the surface of the substrate 62 is exposed between the adjacent sealing portions 63. That is, the comparative example 2 does not include the intermediate portion 32 included in the light emitting device 100 of the present embodiment.

  As shown in FIG. 7, when the emission angle of the light emitted from the light emitting element 61 is 0 degree (direction indicated by the symbol A in FIG. 7), the color temperature of the light emitted from the light emitting device is a predetermined value. Become.

  On the other hand, when the emission angle of the light emitted from the light emitting element 61 becomes large (the direction indicated by the symbol B in FIG. 7), the light emitted from the light emitting element 61 travels outside (air) from the sealing portion 63. Sometimes, due to the difference in refractive index, the light is refracted so as to be more parallel to the surface of the substrate 62, enters another sealing portion 63 existing next to it, and is finally emitted to the outside. It is considered that the distance to move in the sealing portion 63 becomes longer. For this reason, as the emission angle θ increases, a relatively large variation occurs in the color temperature of the emitted light.

  FIG. 8 is an explanatory diagram showing an example of the relationship between the color temperature and the emission angle of the light emitting device 100 of the present embodiment. In FIG. 8, the horizontal axis represents an angle, and represents the light emission angle θ. When the emission angle θ = 0, the direction is perpendicular to the surface of the substrate 2 (normal direction), and when the emission angle θ = 90, for example, the rightward direction parallel to the surface of the substrate 2 is When the emission angle θ = −90, it is a leftward direction parallel to the surface of the substrate 2. The vertical axis represents the difference between the color temperature at the discharge angle θ = 0 and the color temperature at the arbitrary discharge angle θ. FIG. 8 shows data in the present embodiment and Comparative Examples 1 and 2. The data of Comparative Example 1 is for the configuration of FIG. 6, and the data of Comparative Example 2 is for the configuration of FIG.

  As shown in FIG. 8, when the angle (discharge angle θ) is small (about −20 to 20 degrees), there is no difference in the color temperature change in this embodiment, Comparative Example 1 and Comparative Example 2.

  In the case of the comparative example 1, when the emission angle θ exceeds 30 degrees (and −30 degrees), the color temperature is significantly reduced, and the range in which the emission angle is large compared to the case of the present embodiment (for example, ± 30). The color temperature changes greatly in the range exceeding the degree). This can be considered that the influence of total reflection appears as the emission angle θ increases.

  In the case of Comparative Example 2, when the emission angle θ exceeds 60 degrees (and -60 degrees), the color temperature rapidly decreases. This is because the light emitted from the light emitting element is refracted so as to be more parallel to the surface of the substrate at the boundary between the sealing portion and air when traveling from the sealing portion to the outside. It is thought that this is because the movement distance in the sealing portion is increased by entering the sealing portion.

  On the other hand, in the light emitting device 100 according to the present embodiment, since the boundary surfaces between the sealing portion 31 and the intermediate portion 32 and the air are not parallel to the surface of the substrate 1, total reflection as in Comparative Example 1 occurs. do not do. Moreover, in the light-emitting device 100 of this Embodiment, it forms in a line shape like the comparative example 2, and the adjacent sealing part 31 does not separate from the sealing part 31, but is separated. Since they are connected via the intermediate portion 32 having a small thickness dimension, even if the emission angle θ is increased, the light traveling through the sealing portion 31 can travel through the intermediate portion 32 as it is. 2 can be prevented from being refracted at the boundary between the sealing portion and the air. This makes it possible to reduce the difference in the moving distance of the light that moves in the phosphor-containing region according to the light emission angle, and to reduce the difference in the color temperature of the emitted light. The decrease can be suppressed.

  In the configuration including the wall portion for accommodating the light emitting element and the resin body as in the comparative example 1, it is conceivable to use the configuration as in the comparative example 2 instead of providing the wall portion for reducing the process and the manufacturing time. . In Comparative Example 2, since the wall portion is not provided, the manufacturing time can be shortened. However, as shown in FIG. 8, when the emission angle is increased, the color temperature is significantly decreased, and the light emitted from the light emitting device is reduced. Variations in color temperature increase. In the present embodiment, since the wall portion is not provided, the manufacturing time can be shortened, and the variation in color temperature can be further improved as compared with Comparative Example 1.

  FIG. 9 is an explanatory diagram showing another example of the relationship between the color temperature and the emission angle of the light emitting device 100 of the present embodiment. In FIG. 9, the horizontal axis represents the light emission angle, and the vertical axis represents the difference between the color temperature at the emission angle θ = 0 and the color temperature at an arbitrary emission angle θ. FIG. 9 shows how the color temperature changes when the ratio α of the thickness d2 of the intermediate portion 32 to the thickness d1 of the sealing portion 31 is changed.

  In FIG. 9, in any of Examples 1 to 3, the adjacent light emitting element 1 has a separation dimension of 3 mm, and the sealing portion 31 has a thickness (height) of 1.2 mm. The thickness (height) of the intermediate portion 32 is 0.72 mm in Example 1, 0.81 mm in Example 2, and 0.95 mm in Example 3. That is, the ratio α of the thickness d2 of the intermediate portion 32 to the thickness d1 of the sealing portion 31 is 0.60, 0.68, and 0.79 for Examples 1, 2, and 3, respectively.

  As shown in FIG. 9, when the ratio α of the thickness d2 of the intermediate portion 32 to the thickness d1 of the sealing portion 31 is in the range from 0.6 to 0.8, the light emission angle θ is large. However, since the light emitted from the light emitting element 1 travels from the sealing portion 31 to the intermediate portion 32, the light is refracted so that the traveling direction of the light approaches the substrate surface due to the difference in refractive index between the sealing portion and air. Can be suppressed. In addition, since the heights of the sealing portion 31 and the intermediate portion 32 are not the same but different, it is possible to suppress total reflection on the inner surface of the sealing portion, and to suppress variation in color temperature with respect to the emission angle θ. Can do.

  FIG. 10 is a plan view illustrating an example of another configuration of the light emitting device 110 according to the present embodiment. In the example of FIG. 1 described above, the longitudinal direction of the sealing portion 31 formed in a line shape coincides with the direction of the wiring 4 that connects the light emitting elements 1 in the light emitting element group. In FIG. 10, the longitudinal direction of the sealing portion 31 formed in a line shape and the direction of the wiring 4 connecting the light emitting elements 1 in the light emitting element group are orthogonal or substantially orthogonal on the substrate 2. The relationship between the direction of the wiring 4 and the longitudinal direction of the sealing portion 31 can be set as appropriate depending on the arrangement of the light emitting elements 1 on the substrate 2.

  FIG. 11 is a plan view illustrating an example of another configuration of the light emitting device 120 according to the present embodiment. In the example of FIG. 1 described above, a plurality of light emitting element groups in which a plurality of light emitting elements 1 are arranged in a row are arranged apart from each other, and a sealing portion 31 covering each light emitting element group is provided in a line shape. In the example of FIG. 11, a plurality of light emitting element groups in which a plurality of light emitting elements 1 are arranged in a row are arranged apart from each other, and sealing portions 31 that cover the respective light emitting element groups are provided in a lattice shape. Accordingly, the intermediate portion 32 is surrounded by the sealing portion 31 on all sides. In FIG. 11, the wiring 4 is omitted for simplicity.

  FIG. 12 is a plan view illustrating an example of another configuration of the light emitting device 130 according to the present embodiment. In the example of FIG. 12, a plurality of light emitting element groups in which a plurality of light emitting elements 1 are arranged in a row are arranged apart from each other, and a sealing portion 31 covering each light emitting element group is provided in a line shape. The stop part 31 is connected on the end side of the light emitting element group. Therefore, the nozzle 203 is moved from the light emitting element 1 on one side of the four corners of the substrate 2 while discharging the liquid material 300 from the tip end portion 204 of the nozzle 203 of the discharge device 200, and the light emitting element on the other side of the four corners of the substrate 2. It is possible to pot up to 1 continuously.

  Note that the shape of the sealing portion 31 in plan view is not limited to the example of the above-described embodiment, and for example, it may be formed concentrically on the substrate or may be formed in a spiral shape. . Even in these cases, the intermediate portion can be formed between the sealing portions located adjacent to each other.

  In the above-described embodiment, the shape of the substrate 2 is rectangular, and the light emitting elements 1 are arranged in a lattice shape. However, the shape of the substrate 2 and the arrangement of the light emitting elements 1 are not limited to these.

  FIG. 13 is a plan view showing a second example of the shape of the substrate 2 and the arrangement of the light emitting elements 1 of the light emitting device 140. As shown in FIG. 13, the substrate 2 has an octagonal shape. In addition, the shape of the board | substrate 2 is not limited to octagon shape, Other shapes (polygonal shape), such as a hexagon shape, may be sufficient. The light emitting element 1 is arranged according to the shape of the substrate 2, and a straight line connecting the outermost light emitting elements forms an octagon like the substrate 2.

  FIG. 14 is a plan view showing a third example of the shape of the substrate 2 and the arrangement of the light emitting elements 1 of the light emitting device 150. As shown in FIG. 14, the substrate 2 has a rectangular shape with four corners cut obliquely. The light emitting elements 1 are arranged in accordance with the shape of the substrate 2, and the light emitting elements 1 in one row are arranged so as to be positioned between the light emitting elements 1 in the adjacent rows.

  FIG. 15 is a plan view showing a fourth example of the shape of the substrate 2 and the arrangement of the light emitting elements 1 of the light emitting device 160. As shown in FIG. 15, the substrate 2 has a circular shape. The light emitting elements 1 are arranged in accordance with the shape of the substrate 2. For example, the light emitting elements 1 in one row are arranged so as to be positioned between the light emitting elements 1 in the adjacent rows, and the outermost shells are arranged. The light emitting elements 1 are arranged in a circular shape.

  FIG. 16 is a plan view showing a fifth example of the shape of the substrate 2 and the arrangement of the light emitting elements 1 of the light emitting device 170. As shown in FIG. 16, the substrate 2 has a circular shape. The light emitting elements 1 are arranged according to the shape of the substrate 2, for example, are arranged concentrically. 13 to 16, the sealing portion 31 is not illustrated, but the sealing portion 31 is provided in a line by potting a liquid material in a line shape so as to connect the plurality of light emitting elements 1. The intermediate portion 32 can be provided between the adjacent sealing portions 31.

DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Board | substrate 31 Sealing part 32 Middle part

Claims (3)

In a light emitting device having a plurality of light emitting elements mounted on a substrate,
A plurality of light emitting element groups in which a plurality of light emitting elements are arranged are arranged apart from each other,
A sealing portion covering each light emitting element group;
A light emitting device comprising: an intermediate portion extending from the sealing portion between adjacent light emitting element groups.   2. The light emitting device according to claim 1, wherein a ratio of a thickness of the intermediate portion to a thickness of the sealing portion is in a range of 0.6 to 0.8.   The light emitting device according to claim 1, wherein the sealing portion and the intermediate portion contain a phosphor.

Images