CN116137311A - Light emitting device, light source device and method for manufacturing light emitting device - Google Patents

Abstract

The invention provides a light-emitting device capable of reducing visual angle. The light emitting device (100) comprises a light emitting element (20), a first lead (12) on which the light emitting element (20) is mounted, a second lead (11) which is electrically connected to the light emitting element (20) via a conductive member (21) and is arranged so as to be separated from the first lead (12) along a first direction, namely, the X direction, and a molding resin member (40) which directly or indirectly covers the light emitting element (20), wherein the molding resin member (40) comprises a lens portion (43) located above the light emitting element (20), a fixing portion (41) which fixes the first lead (12) and the second lead (11), and an inclined portion (42) which is located between the lens portion (43) and the fixing portion (41) and at least a part of which is inclined so as to extend from the boundary with the lens portion (43) toward the boundary with the fixing portion (41), and the light emitting element (20) is arranged in the fixing portion (41).

Description

Light emitting device, light source device and method for manufacturing light emitting device

technical field

The present disclosure relates to a light emitting device, a light source device and a method for manufacturing the light emitting device.

Background technique

As a light emitting device, a cannonball type light emitting device is known. For example, Patent Document 1 discloses an LED module in which the curvature of the emission surface on the yz plane is smaller than that on the zx plane. Also, for example, Patent Document 2 discloses an optical device in which part of light emitted from a light emitting element is totally reflected in a total reflection region, is reflected in a light reflection portion, and is emitted forward from the total reflection region.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2010-040910

Patent Document 2: Japanese Patent Laid-Open No. 2002-094129

Contents of the invention

The problem to be solved by the invention

An object of embodiments of the present disclosure is to provide a light emitting device with a reduced viewing angle, a light source device, and a method of manufacturing the light emitting device.

Solution to the problem

The light-emitting device disclosed in the embodiment includes: a light-emitting element; a first lead on which the light-emitting element is placed; a second lead electrically connected to the light-emitting element through a conductive member so as to connect with the second lead along a first direction. and a molded resin member that directly or indirectly covers the light emitting element, the molded resin member having: a lens portion positioned above the light emitting element; a fixing portion that holds the light emitting element the first lead and the second lead are fixed; and an inclined portion, which is located between the lens portion and the fixed portion, and at least a part of which extends from a boundary with the lens portion toward a boundary with the fixed portion tilted, the light emitting element is arranged in the fixing part.

The manufacturing method of the light-emitting device disclosed in the embodiment includes the step of preparing an intermediate body configured as follows: the first lead of the connected body in which a pair of first leads and second leads are repeatedly connected through the connecting portion A light-emitting element is placed, and the light-emitting element is electrically connected to the second lead through a conductive member; a process of filling the recesses with a material of a molding resin member in the casting case having a plurality of recesses; The intermediate body is inserted into the depression having the material of the molded resin member, and the molded resin member directly or indirectly covering the light emitting element is formed for each set of the pair of first leads and second leads. process; and a process of cutting the connecting portion of the connected body so as to become a single piece of the pair of first leads and second leads, and in the process of filling the material of the molded resin member, the cast case The body is provided with a lens portion opening on the bottom side of the casting case, an inclined portion opening connected from the lens portion opening and expanding and inclined toward the opening side of the casting case, and an inclined portion opening connected from the inclined portion opening and The fixing part opening facing the opening side of the mold case is arranged, and the light emitting element is arranged in the fixing part opening in the step of forming the molded resin member.

The light source device disclosed in the embodiment includes a plurality of light emitting devices and a mounting substrate of the light emitting devices, the plurality of light emitting devices are the above-mentioned light emitting devices, and the inclined portion interposes the lens in the first direction. The parts are arranged opposite to each other, and the plurality of light emitting devices are arranged in a direction parallel to the first direction.

Invention effect

According to the embodiments of the present disclosure, it is possible to provide a light emitting device with a reduced viewing angle, a light source device, and a method of manufacturing the light emitting device.

Description of drawings

FIG. 1 is a schematic perspective view illustrating a light source device in which light emitting devices according to an embodiment are arranged.

2A is a schematic perspective view illustrating a light emitting device according to an embodiment.

2B is a schematic perspective view illustrating a part of the light emitting device according to the embodiment.

FIG. 2C is a schematic perspective view in which a part of FIG. 2B is enlarged and a molded resin member is removed.

Fig. 3A is a schematic side view illustrating a part of the light emitting device according to the embodiment.

3B is a schematic side view illustrating a part of the light emitting device according to the embodiment.

3C is a schematic plan view illustrating a part of the light emitting device according to the embodiment.

4A is a schematic cross-sectional view illustrating a part of the cross-section along the line IVA-IVA in FIG. 3C , with the first lead, the second lead, and the conductive member removed.

FIG. 4B is a schematic cross-sectional view illustrating light from the light emitting element in FIG. 4A .

5A is a schematic cross-sectional view illustrating a part of a first modified example of an inclined portion.

5B is a schematic cross-sectional view illustrating a part of a second modified example of the inclined portion.

FIG. 5C is a schematic cross-sectional view illustrating a case where no cup portion is provided in FIG. 5B .

FIG. 6A is a schematic perspective view illustrating a modified example of a fixing portion.

FIG. 6B is a schematic plan view illustrating a modified example of the fixing portion.

6C is a schematic plan view showing a modified example of the lens portion and the fixing portion in the second direction.

6D is a schematic plan view showing a modified example of the lens portion and the fixing portion in the second direction.

FIG. 7 is a flowchart illustrating a method of manufacturing the light emitting device according to the embodiment.

8A is a schematic side view illustrating a part of a connected body prepared in a step in the method of manufacturing the light emitting device according to the embodiment.

8B is a schematic side view of a part of an intermediate body in which a light-emitting element is mounted on a bonded body and connected to a first lead and a second lead through a conductive member, illustrating a step in the method of manufacturing the light-emitting device according to the embodiment.

8C is a schematic side view of a part of a state in which an intermediate body is inserted into a recess of a molded case filled with a material for molding a resin member, illustrating a process in the method of manufacturing a light emitting device according to the embodiment.

FIG. 8D is a schematic side view illustrating a part of the connection portion cut and separated into pieces in the process in the method of manufacturing the light-emitting device according to the embodiment.

9A is a schematic front view illustrating a light source device according to an embodiment.

9B is an enlarged schematic cross-sectional view illustrating a part of the light source device according to the embodiment.

Explanation of reference signs:

12...first lead wire;

121...cup;

122...first bottom;

123...first joint;

124...first connection end;

11...second lead wire;

112...second bottom;

113... second joint;

114...second connection end;

15...recess;

151 ... bottom plane (recess);

152...inner side (recess);

155... side wall (recess);

20...light-emitting element;

20A... upper surface (light-emitting element);

22...conductive member (first conductive member);

21...conductive member (second conductive member);

30... light-transmitting member;

30A... upper surface (translucent member);

40...moulded resin components;

40A...Molded resin components (before curing);

41... fixed part;

42... inclined part;

43...lens part;

60... Install the substrate;

70...waterproof member;

100... light emitting device;

200... light source device;

300... connection body;

310...connecting part;

400... intermediates;

C01... casting shell;

C40...Depressed.

Detailed ways

Embodiments will be described below with reference to the drawings. However, the form shown below is an example of a light-emitting device and a method of manufacturing the light-emitting device for realizing the technical idea of the present disclosure, and is not limited to the following. In addition, dimensions, materials, shapes, relative arrangements, and the like of components described in the embodiments are not intended to limit the scope of the present invention thereto, and are merely examples unless otherwise specified. In addition, the size, positional relationship, etc. of the members shown in each drawing may be exaggerated or simplified for clarification of description. In addition, regarding the embodiment, "covering" is not limited to the case of direct contact, but also includes the case of covering indirectly, for example, via other members. In addition, the X direction refers to the direction along the X axis, the Y direction refers to the direction along the Y axis, and the Z direction refers to the direction along the Z axis direction. The positive direction refers to the direction toward the + side in each of the X, Y, and Z directions, in particular. The negative direction refers to a direction toward one side in particular in each of the X, Y, and Z directions. A plane including the X direction and the Z direction is called an XZ plane, a plane including the X direction and the Y direction is called an XY plane, and a plane including the Y direction and the Z direction is called a YZ plane.

[light emitting device]

A light emitting device 100 according to the embodiment will be described with reference to FIGS. 1 to 4B . FIG. 1 is a schematic perspective view illustrating a light source device 200 in which light emitting devices 100 are arrayed. FIG. 2A is a schematic perspective view illustrating an example of the light emitting device 100 . FIG. 2B is a schematic perspective view illustrating a part of the light emitting device 100 . FIG. 2C is a schematic perspective view in which a part of FIG. 2B is enlarged and the molded resin member 40 is removed. FIG. 3A is a schematic side view illustrating a part of the light emitting device 100 . FIG. 3B is a schematic side view illustrating a part of the light emitting device 100 . FIG. 3C is a schematic plan view illustrating a part of the light emitting device 100 . 4A and 4B are schematic cross-sectional views illustrating a part of the cross-section along the line IVA-IVA in FIG. 3C , excluding the first lead 12 , the second lead 11 , and the conductive members 21 and 22 , and hatching is omitted.

The light emitting device 100 can be used, for example, in a light source device 200 described later. The light source device 200 is a device in which a large number of light emitting devices 100 are aligned on a plane. Each configuration of the light emitting device 100 will be described below.

The light emitting device 100 includes: a light emitting element 20 ; a first lead 12 on which the light emitting element 20 is placed; a second lead 11 electrically connected to the light emitting element 20 via a conductive member 21 ; Arranged in one direction, that is, the X direction; and the molded resin member 40, which directly or indirectly covers the light emitting element 20, and the molded resin member 40 has: a lens part 43, which is located above the light emitting element 20; A lead wire 12 and a second lead wire 11 are fixed; and an inclined portion 42, which is located between the lens portion 43 and the fixed portion 41, at least a part of which extends from the boundary with the lens portion 43 toward the boundary with the fixed portion 41 is inclined, and the light emitting element 20 is configured in the fixed portion 41 .

It should be noted that, in the drawings, the first direction that connects the first lead 12 and the second lead 11, that is, the first direction, is represented as the X direction, and the second direction that is perpendicular to the first direction, that is, the X direction, is represented as the Z direction. , the third direction, which is the direction perpendicular to the X direction of the first direction and the Z direction of the second direction and in which the first lead 12 and the second lead 11 extend, is represented as the Y direction. The Y direction of the third direction may be described as an up and down direction. The upper side of the light emitting device 100 is indicated as the Y positive direction in the drawing.

(first lead and second lead)

The first lead 12 and the second lead 11 are members on which the light-emitting element 20 described later is placed, and serve as a part of wiring between the light-emitting element 20 and the outside. The light emitting element 20 is placed on the first lead 12 , the second lead 11 is electrically connected to the light emitting element 20 via the conductive member 21 , and is arranged apart from the first lead 12 along the X direction. The first lead 12 is, for example, a cathode electrode, and the second lead 11 is, for example, an anode electrode. In addition, as an example, the second lead 11 is formed longer than the first lead 12 in the Y direction. The first lead 12 may also be formed longer than the second lead 11 in the Y direction. In the light emitting device 100 , the first lead 12 has a cup-shaped portion 121 which will be described later. The light emitting element 20 is mounted on the cup portion 121 . The first lead 12 and the second lead 11 extend downward from above a fixing portion 41 of a molded resin member 40 described later. In addition, a part of the first lead 12 and the second lead 11 is formed to protrude from the lower surface of the fixing part 41 , and a predetermined length is not exposed from the fixing part 41 . The first lead 12 and the second lead 11 respectively have connection end portions 114 , 124 exposed from the molded resin member 40 . Silver may be coated on the first lead 12 and the second lead 11 from the viewpoint of effectively using reflection of light. From the viewpoint of suppressing migration of silver, it is preferable to use the lead wire on which the light emitting element 20 is placed as the cathode electrode.

The first lead wire 12 has a cup-shaped portion 121 , a first bottom portion 122 continuous with the cup-shaped portion 121 , a first joint portion 123 continuous with the first bottom portion 122 , and a first connection end portion 124 continuous with the first joint portion 123 . The cup-shaped portion 121 and the first bottom portion 122 are less continuous in the Y direction or the X direction. From the positive Y direction toward the negative Y direction, the first bottom portion 122 , the first joining portion 123 , and the first connecting end portion 124 are sequentially arranged. For example, the upper end of the first bottom portion 122 may also be located above the cup-shaped portion 121 . In addition, the upper end of the first bottom portion 122 may be at the same height as the upper edge of the cup-shaped portion 121 . Furthermore, the upper end of the first bottom portion 122 may be located below the upper edge of the cup-shaped portion 121 .

The cup portion 121 has a recess 15 defined by a bottom plane 151 as an upward face and side walls 155 surrounding the bottom plane 151 . The light emitting element 20 is placed on the bottom plane 151 of the concave portion 15 . The concave portion 15 inclines the inner surface 152 of the side wall 155 so as to have an opening that expands upward. The opening of the recess 15 is formed in, for example, a substantially circular or substantially elliptical shape in plan view. The planar view of this embodiment shows the field of view of the state planarly viewed from the positive Y direction.

The height H5 of the concave portion 15 in the direction perpendicular to the bottom plane 151 of the concave portion 15 from the bottom plane 151 of the concave portion 15 to the upper end portion (a part of the upper edge of the cup-shaped portion) of the side wall 155 is preferably 0.2 mm or more. And less than 0.4mm. If the height H5 is 0.2 mm or more, the light emitted from the side of the light emitting element 20 is reflected by the inner surface 152 of the concave portion 15 , so light extraction to the light emitting element 20 can be performed satisfactorily. On the other hand, if the height H5 is 0.4 mm or less, multiple reflections of the light emitted from the light emitting element 20 on the inner surface 152 of the recess 15 can be suppressed, and light extraction to the light emitting element 20 can be performed satisfactorily. From the viewpoint of further exhibiting the above effects, the height H5 is more preferably 0.2 mm or more and 0.37 mm or less. It should be noted that a translucent member 30 described later may be arranged in the concave portion 15 .

The first bottom 122 is elongated in a strip shape. In addition, the upper portion of the first bottom portion 122 covered by the molded resin member 40 has a stepped portion bent toward a direction approaching the second lead 11 . In addition, the upper portion of the first bottom portion 122 is arranged adjacent to the cup portion 121 . The upper end of the first bottom 122 is preferably formed flat so as to be able to be connected with the other end of the conductive member 22 connected to the light emitting element 20 . The first bottom portion 122 has a stepped portion arranged downward from an upper portion adjacent to the cup-shaped portion 121 , and is continuous with the straight portion via the stepped portion. The lower end of the linear portion is arranged so as to be continuous with the first junction portion 123 . The first bonding portion 123 may also be formed wider in the X direction. Furthermore, a first connection end portion 124 formed at the lower end of the first joint portion 123 with the same width and thickness as the lower end of the first bottom portion 122 is disposed. The first connection end portion 124 may also be formed linearly in the Y direction.

The second lead 11 has a second bottom 112 , a second bonding portion 113 continuous with the second bottom 112 , and a second connection end 114 continuous with the second bonding portion 113 . The upper part of the second bottom portion 112 is arranged at a distance from the first bottom portion 122 in the X direction at a distance from which an electrical short circuit does not occur. Here, the combined shape of the second bottom portion 112 and the first bottom portion 122 is approximately bilaterally symmetrical when viewed from the Z direction. The upper end of the second bottom 112 is preferably formed flat so as to be able to be connected with the other end of the conductive member 21 connected to the light emitting element 20 . The upper portion of the second bottom portion 112 , which is covered by the molded resin member 40 and is opposed to the first bottom portion 122 , has a stepped portion bent toward the direction approaching the first lead 12 . The lower end side of the second bottom portion 112 is formed in a straight line, and is arranged so as to be continuous with the second joining portion 113 . The second bonding portion 113 may also be formed wider in the X direction. Furthermore, a second connection end portion 114 formed with the same width and thickness as the lower end of the second bottom portion 112 is arranged at the lower end of the second joining portion 113 . The second connection end portion 114 may also be formed linearly in the Y direction. The second connection end portion 114 may also be formed longer than the first connection end portion 124 . It should be noted that the first joint portion 123 and the second joint portion 113 are arranged at the same height in the X direction. The first connection end portion 124 and the second connection end portion 114 are arranged side by side.

As the material of the first lead 12 and the second lead 11, for example, iron, copper, iron-containing copper, tin-containing copper, copper-plated, gold-plated, or silver-plated aluminum, iron, copper, etc., or their combination. For example, the cup-shaped portion 121 and the first bottom 122 of the first lead 12 covered by the molding resin 40, and the second bottom 112 of the second lead 11 can also be plated with copper as the base. The first bonding portion 123 and the first connecting end portion 124 of 12, and the second bonding portion 113 and the second connecting end portion 114 of the second lead 11 are plated with solder made of tin, copper, silver or tin and copper.

It should be noted that the substantially elliptical shape described in this embodiment is not limited to the locus of a point whose distance from two fixed points on one plane is constant, that is, the ellipse in the strict sense, but also includes the case where it is visually observed as A shape close to an ellipse. For example, it may be an oval shape in which a circle is extended in one direction, an ellipse shape, or a track shape for track and field competitions.

In addition, the substantially circular shape described in the present embodiment is not limited to a strictly circular shape such as a perfect circle, but also includes a shape close to a circular shape when viewed visually. For example, it may be a circle that is distorted or deformed within the range of tolerance and error.

(light emitting element)

The light emitting element 20 is placed on the bottom plane 151 of the concave portion 15 . The shape, size, etc. of the light emitting element 20 can be selected arbitrarily. The top view shape of the light emitting element 20 is, for example, a square, a rectangle, or a hexagon. As the luminescent color of the light emitting element 20, a luminescent color of any wavelength can be selected according to the application. For example, as the light-emitting element 20 of the blue system (light with a peak wavelength of 430 to 500 nm) and the green system (light with a peak wavelength of 500 to 570 nm), a nitride-based semiconductor (In _X Al _Y Ga _{1-X- Y} N, 0≤X, 0≤Y, X+Y≤1), GaP and other light-emitting elements. As the light-emitting element 20 of the red color (light with a peak wavelength of 610 to 700 nm), GaAlAs, AIInGaP, or the like can be used in addition to the nitride-based semiconductor element.

The light emitting element 20 may include a pair of element electrodes on the upper surface 20A, and may be mounted on the bottom plane 151 of the concave portion 15 of the first lead 12 facing upward. Here, one element electrode of the light emitting element 20 is bonded to the second lead 11 via a conductive member 21 such as a wire, and the other element electrode is bonded to the first lead 12 via a conductive member 22 such as a wire. The light emitting element 20 may also be mounted face down.

Here, the light emitting element 20 is disposed on the fixing portion 41 of the molded resin member 40 . In addition, the light emitting element 20 is arranged at a substantially center position of the fixing portion 41 and the lens portion 43 described later in a plan view. The approximate center is not limited to the center in the strict sense, and includes a position close to the center by visual observation. For example, it may be a position deviated from the center by 10% of the maximum diameter.

(molded resin components)

The molded resin member 40 is a member that exposes the connection ends 124 and 114 of the first lead 12 and the second lead 11 to cover and directly or indirectly cover the light emitting element 20 . The molded resin member 40 is preferably formed solid. In the cross section of the light emitting device 100 , it is preferable that the molding resin 40 fills the area from the outer surfaces of the first lead 12 and the second lead 11 to the inner surface of the molding resin 40 . It should be noted that voids may be included in a part of the molded resin member 40 . The molded resin member 40 protects the first lead 12 and the second lead 11 , the light emitting element 20 , conductive members 21 and 22 such as wires from the external environment, and fixes one end of the first lead 12 and the second lead 11 . In addition, the light emitting device 100 can adjust directivity characteristics by adjusting the shape of the molded resin member 40 .

The molded resin member 40 has a lens portion 43 , an inclined portion 42 , and a fixing portion 41 sequentially in the Y direction in a direction from above to below. The lens portion 43 , the inclined portion 42 and the fixing portion 41 of the molded resin member 40 are integrally formed continuously here. For example, the lens portion 43 may be formed integrally with the inclined portion 42 and the fixing portion 41 may be formed separately.

(fixed part)

The fixing portion 41 is the lowermost portion of the molded resin member 40 . The light emitting element 20 is covered near the upper end of the fixing portion 41 . The upper edge of the fixing portion 41 is located at the same position as the upper end portion of the recessed portion 15 or above the upper end portion of the recessed portion 15 . The upper edge of the fixing part 41 is located at the same position as the upper edge of the side wall of the recessed part or above the upper edge of the side wall of the recessed part. In addition, the fixing portion 41 is preferably disposed so as to cover substantially the entirety of the first bottom portion 122 of the first lead 12 and the second bottom portion 112 of the second lead 11 and expose the first bonding portion 123 and the second bonding portion 113 .

Here, the fixed portion 41 has a columnar shape extending in the Y direction, and is substantially elliptical in plan view with the X direction as the major axis. The ratio of the major axis to the minor axis of the substantially ellipse is, for example, about 1.3:1.

The length D3 of the fixing portion 41 in the X direction, which is the first direction, can be, for example, not less than 3.4 mm and not more than 4.4 mm, preferably not less than 3.6 mm and not more than 4.2 mm, in plan view. In addition, the length D4 of the fixing portion 41 in the Z direction, which is the second direction, can be, for example, not less than 2.5 mm and not more than 3.5 mm, preferably not less than 2.7 mm and not more than 3.3 mm, in plan view.

The longest length H4 in the Y direction which is the third direction of the molded resin member 40 can be, for example, not less than 5.5 mm and not more than 9.5 mm, preferably not less than 6.5 mm and not more than 8.2 mm.

(lens part)

The lens portion 43 is the uppermost portion of the molded resin member 40 . The lens portion 43 is located above the light emitting element 20 . It is preferably located above the upper surface 20A of the light emitting element 20 . Part of the light from the light emitting element 20 is emitted to the outside of the light emitting device 100 through the lens portion 43 . The lens portion 43 is a curved surface that bulges upward, and has, for example, a hemispherical shape that bulges upward. The lens portion 43 can condense the light from the light emitting element 20 upward and emit it.

As an example, the lens portion 43 has a substantially elliptical shape close to a circle whose major axis is the X direction in plan view. Here, the lens portion 43 and the fixing portion 41 of the light emitting device 100 are both elliptical in plan view.

The longest length H3 of the lens portion 43 in the third direction, that is, the Y direction can be, for example, not less than 0.5 mm and not more than 3.5 mm, preferably not less than 0.8 mm and not more than 2.5 mm.

Here, in plan view, the major diameter of the lens part 43 is shorter than the major diameter of the fixed part 41 , and the minor diameter of the lens part 43 is shorter than the minor diameter of the fixed part 41 . That is, in plan view, the length D1 of the lens portion 43 in the X direction is shorter than the length D3 of the fixed portion 41 , and the length D2 of the lens portion 43 in the Z direction is shorter than the length D4 of the fixed portion 41 . Regarding the ratio of the length of the minor axis to the length of the major axis, the lens portion 43 is larger than the fixed portion 41 , and the lens portion 43 is approximately circular in plan view.

The outer circumference of the fixed portion 41 is larger than the outer circumference of the lens portion 43 in plan view. The entire outer periphery of the lens portion 43 is located inside the outer periphery of the fixing portion 41 in a plan view. In addition, the center of the outer periphery of the lens portion 43 is at a position substantially overlapping the center of the outer periphery of the fixing portion 41 in a plan view. The outer periphery of the fixed portion 41 is, for example, the upper edge of the fixed portion 41 located at the boundary with the inclined portion 42 . The outer periphery of the lens portion 43 is, for example, the lower edge of the lens portion 43 located at the boundary with the inclined portion 42 .

(inclined part)

The inclined portion 42 is a portion located between the lens portion 43 and the fixed portion 41 . The inclined portion 42 expands from the lower edge of the lens portion 43 toward the fixing portion 41 . The inclined portion 42 is formed such that the surface of the lens portion 43 is continuous with the surface of the fixing portion 41 . Also, the shape and size of the lower edge of the lens portion 43 , which is the boundary between the inclined portion 42 and the lens portion 43 , and the upper edge of the fixed portion 41 , which is the boundary between the inclined portion 42 and the fixed portion 41 , are different. The inclined portion 42 is located above the upper edge of the side wall 155 of the concave portion 15 . The inclined portion 42 is located above the upper end portion of the side wall 155 of the concave portion 15 . The boundary between the inclined portion 42 and the fixed portion 41 may be positioned to overlap or not overlap the upper end of the side wall 155 of the concave portion 15 in the Y direction, which is the third direction.

The inclined portion 42 may have an inclined surface that is continuous with the lens portion 43 and the fixing portion 41 , or may have an inclined surface that is curved. The inclination of the inclined surface can be changed, for example, so that it becomes smaller at the top and becomes larger at the bottom. Here, the inclined surface refers to the surface of the inclined portion 42 with respect to the XZ plane.

The inclined portions 42 are arranged to face each other across the lens portion 43 at least in the X direction which is the first direction. In addition, the slope part 42 may be arrange|positioned so that it may oppose across the lens part 43 in the Z direction which is a 2nd direction.

In a section along the Y direction, and the X direction or the Z direction, the length of the slope is from the upper end to the lower end of the slope of the slope portion 42 (from the connection point of the slope portion 42 with the lens portion 43 to the connection point with the fixed portion 41). point) length. Here, a surface including the apex of the lens portion 43 will be described as an example. In a section along the XY plane, the inclined portion 42 has an inclined length A1. In a section along the YZ plane, the inclined portion 42 has an inclined length A2. The slope length A1 is equal to or longer than the slope length A2. Here, the inclination length A1 is longer than the inclination length A2. The slope length can be a straight line or a curve.

In addition, in the inclined portion 42, an angle formed by a line connecting the inclined upper end to the lower end of the inclined portion 42 with a straight line and a straight line parallel to the Y direction passing through the connection point of the inclined portion 42 with the lens portion 43 is defined as is the angle of inclination. Here, a surface including the apex of the lens portion 43 will be described as an example. The inclination angle in the section along the XY plane is larger than the inclination angle in the section along the YZ plane. In the inclined portion 42, the angle formed by the line connecting the inclined upper end to the lower end of the inclined portion 42 with a straight line and a straight line parallel to the X direction or the Z direction passing through the connection point of the inclined portion 42 with the fixed portion 41 is the same as The magnitude relationship of the aforementioned inclination angles is opposite.

The inclined cross-sectional area of the inclined portion 42 in the X direction is larger than the inclined cross-sectional area of the inclined portion 42 in the Z direction. Here, the inclined cross-sectional area refers to a straight line parallel to the Y direction and passing through the boundary between the inclined portion 42 and the lens portion 43, a straight line parallel to the X direction or the Z direction, and a connection point connecting the lens portion 43 and a fixed line. The cross-sectional area of the line shape of the connecting points of the portion 41, which is constituted by a straight line or a curved line. As an example, in the X direction and the Z direction, inclinations are arranged symmetrically with the lens portion 43 in the middle. Accordingly, the light emitting device 100 can set the directional characteristics in the X direction symmetrically on both sides of the light emitting device 100 . It should be noted that, here, the inclined surface of the inclined portion 42 is provided over the entire outer circumference of the lower end portion of the lens portion 43 . The inclination in the X direction is gentler than the inclination in the Z direction. The inclined surface of the inclined portion 42 may be arranged radially on the outer periphery of the lower end portion of the lens portion 43 so as to face downward and have the same inclination.

As shown in FIG. 4A , in a cross section cut along the first direction, X direction, and the third direction, Y direction, the connection point 421E between the inclined portion 42 and the fixed portion 41 is located at the upper end of the side wall 155 passing through the concave portion 15 between the straight line L1 parallel to the X direction and the straight line L2 connecting the upper end 25A of the intersection of the upper surface 20A and the side surface of the light emitting element 20 , and the upper end 153A of the side wall 155 of the recess 15 . The connection point of the inclined portion 42 to the fixed portion 41 may be located at a position close to the straight line L2, for example, like the connection point 420E shown in FIG. 4A .

The inclination of the inclined portion 42 can be set at an angle at which light rays passing through the inclined portion 42 among the light emitted from the light emitting element 20 are emitted in a direction parallel to the straight line L1, or at an angle at which the light rays are emitted below the straight line L1, or can be set to The angle at which the light emitted from the light emitting element 20 is totally reflected. In a cross section along the X direction and the Y direction passing through the center of the lens portion 43 in a plan view, the above-described angle may be set.

Examples of the material of the molded resin member 40 include light-transmitting resins excellent in weather resistance such as epoxy resins, urea resins, and silicones, glass, and the like. The molded resin member 40 is a member having translucency or a transparent body. The molded resin member 40 may contain a filler such as a diffusion material. When the molded resin member 40 contains a filler, light distribution variation can be reduced. Examples of fillers include barium titanate, titanium oxide, aluminum oxide, silicon oxide and the like.

The molded resin member 40 may also contain a colorant. For example, by containing a blue colorant, a green colorant, or a red colorant, it is possible to provide a light-emitting device 100 that emits blue light, a light-emitting device 100 that emits green light, and a light-emitting device 100 that emits red light. By using these light emitting devices 100, it is possible to manufacture a light source device 200 capable of full-color display.

As the colorant, copper phthalocyanine, C.I. Pigment 36, N,N'-dimethyl-3,4:9,10-perylenebisimide imide can be used, for example. Moreover, as a coloring agent, the coloring agent containing any of a pigment and a dye can be used.

The pigment is not particularly limited, and examples include pigments using inorganic materials and organic materials, and pigments using the following materials are exemplified.

Examples of inorganic materials include red iron (Fe ₂ O ₃ ), red lead (Pb ₃ O ₄ ), titanium-nickel-antimony oxides, titanium-nickel-barium oxides, titanium-chromium-antimony oxides, titanium-chromium oxides, and titanium-chromium oxides. Niobium oxides, etc.

Examples of organic materials include anthraquinone-based, azo-based, quinacridone-based, perylene-based, diketopyrrolopyrrole-based, monoazo-based, disazo-based, pyrazolone-based, benzene Imidazolone series, quinoxaline series, azomethine series, isoindolinone series, isoindoline series, etc.

The dye is not particularly limited, and examples thereof include anthraquinone-based dyes, methine-based dyes, azomethine-based dyes, oxazine-based dyes, azo-based dyes, styryl-based dyes, and coumarin-based dyes. , porphyrin-based dyes, dibenzofuranone-based dyes, diketopyrrolopyrrole-based dyes, rhodamine-based dyes, xanthene-based dyes, pyrromethene-based dyes, and the like.

It should be noted that the pigment and the dye basically do not need to convert the light from the light emitting element 20 into a different wavelength. This is because, as will be described later, when the wavelength conversion member is included, it does not affect the wavelength conversion member.

The molded resin member 40 may also contain a light stabilizer. Examples of light stabilizers include benzotriazole-based, benzophenone-based, salicylate-based, cyanoacrylate-based, hindered amine-based, and the like.

The molded resin member 40 may also contain a wavelength conversion member. Phosphors are mentioned as the wavelength conversion member. Examples of phosphors include yttrium-aluminum-garnet activated by cerium, lutetium-aluminum-garnet activated by cerium, terbium-aluminum-garnet activated by cerium, any one of europium and chromium or Two activated nitrogen-containing calcium aluminosilicates, sialon activated by europium, silicate activated by europium, potassium fluorosilicate activated by manganese, nitride phosphor activated by europium, with perovskite structure phosphors (such as CsPb(F, Cl, Br, I) ₃ ), or quantum dot phosphors (such as CdSe, InP, AgInS ₂ or AgInSe ₂ ), etc. It should be noted that the light emitting device 100 can also emit various colors through the combination of the light emitting element 20 and the wavelength conversion member.

[Operation of light emitting device]

When the light-emitting device 100 is driven, current is supplied from an external power source to the light-emitting element 20 through the first lead 12 and the second lead 11 , so that the light-emitting element 20 emits light. Here, in a cross section cut along the X direction which is the first direction and the Y direction which is the third direction, the light emitted from the upper end 25A which is the intersection point of the upper surface 20A and the side surface of the light emitting element 20 is taken as an example. to explain.

For example, the light R1 emitted upward from the upper end portion 25A of the light emitting element 20 travels toward the lens portion 43 . The light R2 emitted laterally from the upper end portion 25A is reflected by the side wall 155 , changes direction upward, and travels toward the lens portion 43 . The light traveling to the lens portion 43 is emitted to the outside of the light emitting device 100 through the lens portion 43 .

The light R3 traveling from the upper end portion 25A above the upper end portion 153A of the side wall 155 travels toward the surface 421 of the inclined portion 42 serving as an interface with the outside. The light R3 travels in a direction forming a traveling angle θ0 with the straight line L1, and is incident on the surface 421 at an incident angle θ1. It should be noted that part of the light of the light R3 is blocked by the side wall 155 of the concave portion 15 . Here, the advancing angle θ0 represents an angle with respect to a straight line L111 parallel to the upper surface 20A of the light emitting element 20 and passing through the upper end portion 153A. The straight line L111 is parallel to the straight line L1. Therefore, the advancing angle θ0 with respect to the straight line L111 is the same as the advancing angle θ0 with respect to the straight line L1. In addition, the incident angle θ1 is an angle formed by the normal line L11 to the inclined portion 42 at the point where the light R3 is incident on the surface 421 and the light R3. Here, since the inclination of the inclined portion 42 is an angle at which the light from the light emitting element 20 can be totally reflected, that is, the incident angle θ1 is greater than or equal to the critical angle, the light R3 is totally reflected on the surface 421 and changes its direction downward. A waterproof member 70 described below is disposed below, and the waterproof member 70 absorbs light to further suppress reflection.

The inclination of the inclined portion 42 may be an angle that allows total reflection in a cross section passing through the center of the lens portion 43 in plan view and along the X direction and the Y direction. A cross section passing through the center of the lens portion 43 and along the X direction and the Y direction includes a line connecting the apex of the lens portion 43 and the central point of the lens portion 43 in plan view.

In the light-emitting device 100 , the angle of view in the X direction when viewing the light-emitting device 100 from the upper side, that is, the positive Y side in the figure, can be reduced by total reflection of light at the inclined portion 42 adjacent to the lens portion 43 .

For example, epoxy resin or the like is used as the material of the molded resin member 40 , and when the refractive index of the molded resin member 40 is 1.5, the critical angle when the outside is air is 42 degrees. The inclination of the inclined portion 42 can be represented by, for example, the normal line inclination angle θ3 which is the angle formed by the normal line L11 and the straight line L1 . In addition, the normal line inclination angle θ3 can also be expressed as the sum of the advancing angle θ0 and the incident angle θ1. Therefore, at each point on the surface 421, by inclining the inclined portion 42 so that the magnitude of the normal line inclination angle θ3 is equal to or greater than the value obtained by adding 42 degrees to the magnitude of the advancing angle θ0, the direction from the light emitting element 20 to the Light traveling on surface 421 is totally reflected. It should be noted that the critical angle is the incident angle at which the refraction angle becomes 90 degrees.

In the light-emitting device 100, the inclined portion 42 is provided between the lens portion 43 positioned above the light-emitting element 20 and the fixing portion 41 on which the light-emitting element 20 is arranged, and at least a part thereof is from the boundary with the lens portion 43 toward the boundary with the fixing portion 41. By expanding the inclination, the size of the lens portion 43 can be adjusted independently of the fixing portion 41 , and the inclination of the inclination portion 42 can be used to improve the degree of freedom in setting the directional characteristics of light emitted from the light emitting device 100 . For example, when used as a light source device, by narrowing the viewing angle of light emitted in the X direction of the light emitting device 100 , it is possible to suppress irradiation of unnecessary parts.

In the light-emitting device 100, the lens portion 43, the inclined portion 42, and the fixed portion 41 are integrally formed, thereby suppressing the influence of the boundary surface between the lens portion 43, the inclined portion 42, and the fixed portion 41 on the traveling path of light, and enabling The light from the light emitting element 20 is effectively used.

In the light-emitting device 100 , the inclined portions 42 are arranged to face each other with the lens portion 43 interposed therebetween in the X direction, whereby directivity characteristics and the like can be adjusted in the X direction. In addition, in the light-emitting device 100 , the inclined portions 42 are arranged to face each other with the lens portion 43 interposed therebetween in the Z direction, whereby directivity characteristics and the like can also be adjusted in the Z direction.

By making the inclination length A1 longer than the inclination length A2, the surface of the inclination portion 42 can be increased, and the degree of freedom in setting the directional characteristics of light from the light emitting element 20 under the inclination of the inclination portion 42 can be increased. In addition, by making the inclination angle in the section along the XY plane larger than the inclination angle in the section along the YZ plane, the shielding effect can be improved and the viewing angle can be narrowed.

In the light emitting device 100 , the inclined cross-sectional area of the inclined portion 42 in the X direction is larger than the inclined cross-sectional area of the inclined portion 42 in the Z direction, thereby efficiently narrowing the viewing angle in the X direction. That is, since the Y direction has the same height, the inclined cross-sectional area increases as the connection point of the inclined portion 42 to the fixed portion 41 becomes farther in the Z direction or the X direction. That is, this means that the angle of inclination becomes larger, the shielding effect can be improved, and the viewing angle can be narrowed.

In the light-emitting device 100, the first lead 12 and the second lead 11 have the connection ends 124, 114 exposed from the molded resin member 40, so that the first lead 12 and the second lead 11 can be directly used for connection with the outside. connect.

In the light emitting device 100 , the outer periphery of the fixed portion 41 in plan view is larger than the outer periphery of the lens portion 43 , thereby reducing the divergence of the light distribution of the lens portion 43 . Therefore, it is possible to increase the brightness of the light emitting device 100 .

The light-emitting device 100 has an inclined surface that is curved and inclined, so that the directional characteristics and the like can be finely adjusted while changing the inclination smoothly.

In the light-emitting device 100 , by placing the light-emitting element 20 on the bottom plane 151 of the concave portion 15 , lateral light can be reflected upward on the sidewall 155 of the concave portion 15 , thereby effectively narrowing the viewing angle.

In the light emitting device 100 , the inclined portion 42 is located above the upper edge of the side wall 155 of the concave portion 15 , so that the inclination of the inclined portion 42 can be effectively used to adjust directional characteristics and the like.

In the light emitting device 100, in a cross section taken along the X direction and the Y direction, the connection point between the inclined portion 42 and the fixed portion 41 is located on a straight line L1 that passes through the upper end portion of the side wall 155 of the concave portion 15 and is parallel to the X direction. , and the straight line L2 connecting the upper end 25A of the side surface of the light-emitting element 20 close to the inclined portion 42 and the upper end 153A of the side wall 155 of the concave portion 15, so that the light that does not exceed the side wall 155 can pass through the side wall 155 For reflection, the inclined portion 42 is configured for light traveling beyond the side wall 155 . The light traveling beyond is refracted or totally reflected by the inclined portion 42 .

In the light-emitting device 100, the upper edge of the fixing part 41 is located at the same position as the upper end of the recess 15 or above, so that the side wall 155 of the recess 15 can be covered by the fixing part 41, and the recess 15 can be connected to the first lead 12. and the second lead wire 11 are integrally fixed.

In the light-emitting device 100 , the lens portion 43 and the fixing portion 41 have substantially elliptical shapes in plan view, so that directivity characteristics and the like can be set so as to have anisotropy in the long-diameter direction and the short-diameter direction.

In the light emitting device 100, the length of the fixing portion 41 in the X direction in plan view is set to be 3.4 mm to 4.4 mm, preferably 3.6 mm to 4.2 mm, and the length of the Z direction is set to be 2.5 mm to 2.5 mm. 3.5 mm, preferably 2.7 mm or more and 3.3 mm or less, so that the molded resin member 40 in the X direction connecting the first lead 12 and the second lead 11 can be thickened to ensure strength, etc., and in the Z direction It is possible to arrange them with increased density.

In the light emitting device 100 , the longest length of the lens portion 43 in the Y direction is 0.5 mm to 3.5 mm, preferably 0.8 mm to 2.5 mm, whereby the shape of the lens portion 43 can be freely set.

In the light emitting device 100, the longest length of the molded resin member 40 in the Y direction is 5.5 mm to 9.5 mm, preferably 6.5 mm to 8.2 mm, so that the first lead 12 and the second lead 12 can be secured and fixed. The sufficient length H1 of the fixing portion 41 required by the two leads 11 . In addition, it is possible to ensure a sufficient length for protecting the light emitting element 20 and the like from water and the like that infiltrate from the outside along the first lead 12 and the second lead 11 by extending the intrusion path.

It should be noted that the inclined portion 42 may have a flat inclined surface that is continuous and inclined to the lens portion 43 and the fixing portion 41 . The light-emitting device 100 can effectively use the characteristics such as refraction and reflection based on a flat surface to adjust directional characteristics and the like. The inclined portion 42 may also be configured by combining flat inclined surfaces having different inclinations.

The inclined surfaces of the inclined portion 42 may have the same inclination in the X direction or the Z direction, or may have different inclinations on the first lead 12 side and the second lead 11 side, for example.

The inclined surface of the inclined portion 42 may be provided on at least a part of the outer periphery of the lower end portion of the lens portion 43 . For example, an inclined surface expanding downward may be provided only at the lower end portion on the side of the second lead 11 in the X direction.

The lens portion 43 may have a substantially elliptical shape with the X direction as the minor axis in a plan view, or may be substantially circular. The fixing portion 41 may be substantially elliptical or substantially circular in plan view with the short axis being the X direction. The plan view shapes of the lens portion 43 and the fixing portion 41 may both be approximately elliptical, both may be approximately circular, or one may be approximately elliptical and the other may be approximately circular.

[modified example]

Next, modifications of the inclined portion will be described with reference to FIGS. 5A to 5C . 5A is a schematic cross-sectional view illustrating a part of a light emitting device 100A according to a first modification example of an inclined portion. 5B is a schematic cross-sectional view illustrating a part of the light emitting device 101 according to the second modification example of the inclined portion. 5C is a schematic cross-sectional view illustrating a part of a light emitting device 102 that does not include a cup-shaped portion in a second modified example of an inclined portion. 5A to 5C are schematic cross-sectional views illustrating examples with the first lead 12 , the second lead 11 , and the conductive members 21 and 22 removed, and hatching is omitted.

In addition, the light which travels along the cross-section along the X direction and Y direction passing the center of the lens part 43 in planar view is demonstrated as an example.

The light emitting device 100A of the first modification example of the inclined portion is different from the light emitting device 100 except that the inclined portion 42A has the same configuration as the light emitting device 100 . As shown in FIG. 5A , the inclination of the inclined portion 42A of the light emitting device 100A is located at the upper end portion of the side wall 155 in the Y direction. The connection point 425E of the inclined portion 42A to the fixed portion 41 is located on a straight line L1 that passes through the upper end portion of the side wall 155 of the concave portion 15 and is parallel to the X direction. It should be noted that the distance D5 from the center of the bottom plane 151 of the concave portion 15 to the surface of the fixing portion 41 is the same as the distance D5 in the light emitting device 100 . In addition, the positional relationship between the cup portion 121 and the lens portion 43 is the same as that of the light emitting device 100 .

In the light emitting device 100A, in a cross section taken along the X direction which is the first direction and the Y direction which is the third direction, the light emitted from the light emitting element 20 passes through the connection point 425S with the lens part 43 of the inclined part 42A The light is emitted on a straight line parallel to the X direction passing through the connection point 425S, or is emitted downward from the straight line parallel to the X direction.

The light RA is an example of light emitted from the light emitting element 20 and passing through the connection point 425S of the inclined portion 42A with the lens portion 43 . The outgoing light RA1 of the light RA to the outside passes through the connection point 425S of the inclined portion 42A with the lens portion 43 and is emitted on a straight line parallel to the X direction. By adjusting the inclination of the inclined portion 42A, it is possible to emit downward from a straight line parallel to the X direction like the emitted light RA2.

In the light emitting device 100A, in a cross section along the X direction and the Y direction, among the light emitted from the light emitting element 20 , the light passing through the connection point 425S with the lens portion 43 of the inclined portion 42A is emitted to the light passing through the connection point 425S. And a straight line parallel to the X direction or emitted downward from a straight line parallel to the X direction can narrow the viewing angle in the X direction when viewing the light emitting device 100A from the upper side, that is, the positive Y side in the figure.

It should be noted that the inclination of the inclined portion 42A may be at least an angle as follows. In a cross section along the X direction and the Y direction passing through the center of the lens portion 43 in plan view, from the upper end of the side surface of the light emitting element 20 The light RA passing through the connection point 425S of the inclined part 42A with the lens part 43 from the position of the part 25A is emitted on a straight line parallel to the X direction passing through the connection point 425S or below a straight line parallel to the X direction.

Light RB is an example of light that travels from the position of the upper end 25A of the side surface of the light emitting element 20 , passes through the vicinity of the upper end 153A of the side wall 155 of the recess 15 , and travels without being reflected by the side wall 155 . The light RC is an example of light reflected by the side wall 155 . Light RB is emitted to the outside through point 425B on surface 425 of inclined portion 42A. The inclination of the inclined portion 42A is preferably an angle at which the outgoing light RB1 of the light RB travels in the X direction or below the X direction.

Next, the light emitting device 101 according to the second modified example of the inclined portion will be described. The light-emitting device 101 is different from the light-emitting device 100 in that a later-described translucent member 30 is provided in the concave portion 15 and an inclined portion 42L, but has the same structure as the light-emitting device 100 except that. As shown in FIG. 5B , in the light-emitting device 101 , the translucent member 30 has an upper surface 30A of the translucent member 30 at a position where the recess 15 fills up to the upper end of the side wall 155 . The inclination of the inclined portion 42L is set to the position of the upper end portion of the side wall 155 in the Y direction. The connection point 422E of the inclined portion 42L to the fixed portion 41 is located on a straight line L1 that passes through the upper end portion of the side wall 155 of the concave portion 15 and is parallel to the X direction. It should be noted that the distance D5 from the center of the bottom plane 151 of the concave portion 15 to the surface of the fixing portion 41 is the same as that of the light emitting device 100 . In addition, the positional relationship between the cup portion 121 and the lens portion 43 is the same as that of the light emitting device 100 .

In the light emitting device 101, in the cross section along the X direction and the Y direction, the light traveling from the upper surface 30A of the translucent member 30 to the surface 422 of the inclined portion 42L is refracted in the X direction or below the X direction. Emits outward from the surface 422 .

For example, light R4 emitted upward from the upper surface 30A of the translucent member 30 travels toward the lens portion 43 . The light traveling to the lens portion 43 is condensed upward by the lens portion 43 and emitted to the outside.

The light rays R5 and R6 traveling from the upper surface 30A to the surface 422 of the inclined portion 42L are refracted in the X direction or below the X direction on the surface 422 to be emitted. By adjusting the inclination of the inclined portion 42L, it is possible to become outgoing light that is refracted below the X direction and proceeds like the outgoing light R52 and R62 . Regarding the refraction angle θ2, the outgoing light R52, R62 is larger than the outgoing light R51, R61. That is, the refraction angle θ2 of the outgoing light traveling downward is larger than the refraction angle θ2 of the outgoing light traveling in the X direction. The inclination of the inclined portion 42L is set such that the magnitude of the refraction angle θ2 is equal to or greater than the normal line inclination angle θ3. It should be noted that the emitted light may be emitted without being refracted upward from the X direction, and may be totally reflected.

In the light emitting device 101 , the inclined portion 42L adjacent to the lens portion 43 refracts light in the X direction or below the X direction. Thereby, the viewing angle in the X direction when viewing the light emitting device 101 from the upper side, that is, the positive Y direction side in the drawing, can be reduced.

In the light emitting device 101 , since the light emitting surface is the upper surface 30A of the translucent member 30 , light having a small traveling angle θ0 travels without being reflected by the side wall 155 . There is a limitation in the size of the light emitting device. For example, if the distance D5 cannot be increased, an inclination for total reflection of light with a small advancing angle θ0 cannot be provided. Even in such a case, the light-emitting device 101 can direct the refracted light to the X direction or below the X direction by the inclined portion 42L without changing the positional relationship between the cup portion 121 and the lens portion 43 or the distance D5. shot out, allowing the viewing angle to be narrowed.

The translucent member 30 is arranged in the concave portion 15 and covers the light emitting element 20 . Examples of the material of the translucent member 30 include translucent resins such as epoxy resins, urea resins, acrylic resins, and silicone resins, glass, and the like. The translucent member 30 is a translucent member or a transparent body. The translucent member 30 may contain a filler such as a diffusion material. By making the translucent member 30 contain a filler, light distribution variation can be reduced. In addition, the translucent member 30 may contain a colorant, an optical stabilizer, a phosphor, a colorant, and the like. As for the colorant, filler, light stabilizer, and phosphor, those explained by molding the resin member 40 can be used.

The light-emitting device 101 includes the translucent member 30 in the concave portion 15, so that the molded resin member 40 does not come into direct contact with the light-emitting element 20, and since the molded resin member 40 is not disposed near the light-emitting element 20, it is possible to prevent the light-emitting element from Deterioration of the molded resin member 40 caused by the heat of 20 . Thus, the lifetime of the light emitting device 101 can be extended.

Next, the light emitting device 102 according to the second modified example of the inclined portion will be described. As shown in FIG. 5C , the light emitting device 102 has the same inclined portion 42L as that of the light emitting device 101 . The difference between the light emitting device 102 and the light emitting device 101 is that no recess 15 is provided, and the light emitting element 20 is placed on the die pad 126 formed on the upper end of the first lead 12 . In addition, the translucent member 30 is not disposed, and the molded resin member 40 directly covers the light emitting element 20 . In other respects, it has the same configuration as that of the light emitting device 101 . Light is emitted from the upper surface 20A and side surfaces of the light emitting element. In this case, it is preferable that the position of the upper surface of the die pad 126 is adjusted to substantially the same height as the position of the lower end portion 422E of the inclined portion 42L.

For example, the lights R7 , R8 , and R9 emitted from the lower end portion 25B of the light emitting element 20 proceed similarly to the lights R4 , R5 , and R6 explained by the light emitting device 101 , and are emitted to the outside. Since the light emitting device 102 does not have the concave portion 15 , the light emitted from the lower end portion 25B of the light emitting element 20 will be described as an example. This is because the traveling angle of the light emitted from the lower end portion 25B is the largest.

In the light emitting device 102 , since the light emitting element 20 is not surrounded by the side wall 155 of the concave portion 15 , similarly to the light emitting device 101 , light with a small traveling angle θ0 travels without being reflected. Like the light emitting device 101 , the light emitting device 102 refracts light in the X direction or below the X direction at the inclined portion 42L adjacent to the lens portion 43 . Accordingly, it is possible to reduce the viewing angle in the X direction when viewing the light emitting device 102 from the upper side, that is, the positive Y direction side in the drawing.

Note that instead of adjusting the die pad 126 , the position of the upper end of the fixing portion 41 may be adjusted so that the upper surface 20A of the light emitting element 20 is at the lower end of the inclined portion 42L.

Next, modifications of the fixing portion and modifications of the size relationship between the lens portion and the fixing portion will be described with reference to FIGS. 6A to 6D . Except for the size relationship between the fixed portion, the lens portion, and the fixed portion, it has the same configuration as that of the light emitting device 100 to the light emitting device 101 . 6A and 6B are a schematic perspective view and a schematic plan view of a light emitting device 130 illustrating a modified example of a fixing portion. 6C and 6D are schematic plan views of light emitting devices 140A and 140B showing modified examples of the size relationship between the lens unit and the fixing unit in the second direction, that is, the Z direction.

The end portion in the X direction of the fixing portion 41S of the light emitting device 130 is formed in a planar shape. In plan view, the length D3 in the X direction is the same as the length D3 in the X direction of the light emitting device 100 . In addition, the outer periphery of the fixing portion 41S has a linear portion along the Z direction in plan view. The linear portion of the fixing portion 41S has a side plane. The length D6 of the linear portion is about 1/5 of the longest length D4 in the Z direction. The length D6 may be, for example, about 4/5 of the length D4.

The slope part 42S is formed so that the outer periphery of an upper end part may continue to the fixed part 41S which has a linear part along a Z direction. The inclination of the inclined portion 42S is an angle at which light from the light emitting element 20 can be totally reflected, similarly to the light emitting device 100 . Or, it becomes an angle which can be refracted parallel to the X direction or downward.

Compared with the case where the lower end portion of the inclined portion is substantially elliptical, the light emitting device 130 can set an angle at which the inclination of the inclined portion is totally reflected in the entire linear portion of the inclined portion 42S, or be parallel to or facing the X direction. The angle of refraction below.

Since the outer circumference of the lower end portion of the inclined portion 42S of the light emitting device 130 has a linear portion along the Z direction, it is possible to reduce the viewing angle in the X direction when viewing the light emitting device 130 from the upper side, that is, the positive Y direction side in the figure, and reduce the angle of view. For example, the angle of view in a direction 45 degrees from the X direction.

The length D2 of the Z direction of the lens part 43 in planar view may be the same as the length D4 of the fixing part 41 . The inclination of the inclined portion 42 of the light emitting device 140A is arranged only in the X direction. The lens portion 43 has the same length as the fixed portion 41 in the Z direction. The light emitting device 140A shows an example in which the lens portion 43 and the fixing portion 41 are connected in the Z direction without inclination of the inclined portion 42 .

In addition, the length D2 of the Z direction of the lens part 43 in planar view may be longer than the length D4 of the fixing part 41 . The light emitting device 140B shows an example in which the inclination of the inclined portion 42 is arranged along the X direction, the lens portion 43 is longer than the fixed portion 41 in the Z direction, and the fixed portion 41 is connected below the lens portion 43 . It should be noted that the light emitting devices 140A and 140B may be combined with the linear portion of the fixing portion 41S in the light emitting device 130 .

In the light emitting devices 140A and 140B, the degree of freedom in adjustment of directional characteristics and the like can be further increased by making the length D2 of the lens portion 43 in the Z direction in plan view equal to or longer than the length D4 of the fixing portion 41 . In addition, by reducing the size of the fixing portion 41, it is possible to increase the mounting density in the light source device 200 described later.

[Manufacturing method of light-emitting device]

Next, a method of manufacturing the light emitting device according to the embodiment will be described with reference to FIGS. 7 to 8D . FIG. 7 is a flowchart illustrating a method of manufacturing the light emitting device 100 . 8A is a schematic side view illustrating a part of the connected body 300 prepared in the method of manufacturing the light emitting device 100 . 8B is a schematic side view illustrating a part of the intermediate body 400 in which the light-emitting element 20 is mounted on the joint body 300 and connected to the first lead 12 and the second lead 11 through the conductive members 21 and 22 in the method of manufacturing the light-emitting device 100. . 8C is a schematic side view illustrating a part of a state in which the intermediate body 400 is inserted into the recess C40 of the molded case C01 filled with the molded resin member material 40A in the manufacturing method of the light emitting device 100 . FIG. 8D is a schematic side view illustrating a part of the connection portion 310 cut and separated into pieces in the method of manufacturing the light emitting device 100 .

The manufacturing method of the light-emitting device 100 includes: step S10, preparing an intermediate body 400, the intermediate body 400 is configured as follows, and the first lead of the connecting body 300 in which a pair of first leads 12 and second leads 11 are repeatedly connected through the connecting part 310 12 Place the light-emitting element 20, and electrically connect the light-emitting element 20 and the second lead 11 through the conductive member 21; Step S20, filling the recess C40 with the material of the molded resin member in the casting case C01 having a plurality of recesses C40 40A; Step S30, inserting the intermediate body 400 into the recess C40 of the material 40A filled with the molding resin member, and forming a mold that directly or indirectly covers the light emitting element 20 for each pair of the first lead 12 and the second lead 11. plastic resin member 40; and singulation process S40, the connecting portion 310 of the connected body 300 is cut so as to become a pair of first lead 12 and second lead 11, in the process S20 of filling the material 40A of the molded resin member, The casting case C01 is provided with a lens portion opening C43 on the bottom side of the casting case C01, an inclined portion opening C42 connected from the lens portion opening C43 and expanding and inclined toward the opening side of the casting case C01, and an inclined portion opening C42 connected from the inclined portion opening C42. Furthermore, in the fixing portion opening C41 disposed toward the opening side of the molded case C01 , the light emitting element 20 is disposed in the fixing portion opening C41 in the step S30 of forming the molded resin member 40 .

(Process of preparing intermediates)

The step S10 of preparing the intermediate body is a step of preparing the intermediate body 400 before the molded resin member 40 is provided. The step S10 of preparing an intermediate body includes a step S11 of preparing a connected body, a step S12 of mounting a light-emitting element, and a step S13 of connecting a conductive member.

The step S11 of preparing the connected body is a step of preparing the connected body 300 in which the pair of first leads 12 and the second leads 11 are repeatedly connected via the connecting portion 310 . In this step, for example, the first lead 12 and the second lead 11 formed into a desired shape are formed on the base frame.

The step S12 of placing the light emitting element is a step of placing the light emitting element 20 on the connected body 300 . In this step, the light emitting element 20 is placed on the bottom plane 151 of the concave portion 15 of the cup portion 121 of the first lead 12 via an adhesive member.

The step S13 of connecting the conductive members is a step of electrically connecting the light emitting element 20 to the first lead 12 and the second lead 11 via the conductive members 21 and 22 such as wires. In this step, one element electrode of the light emitting element 20 is connected to the first lead 12 via the conductive member 22 , and the other element electrode is connected to the second lead 11 via the conductive member 21 .

In step S10 of preparing an intermediate body, step S14 of forming a translucent member may be provided after step S13 of connecting a conductive member. In this step S14 , the material of the light-transmitting member before being cured is poured into the concave portion 15 to be cured, and the light-transmitting member 30 covering the light-emitting element 20 is formed.

(The process of filling the material of the molded resin member)

The step S20 of filling the material of the molded resin member is a step of filling the material 40A of the molded resin member before curing into the mold case C01 . The molding case C01 has a plurality of depressions C40 corresponding to the shape of the molded resin member 40 of the light emitting device 100 . The casting case C01 can be set as a mold etc., for example.

Each recess C40 continuously includes a lens portion opening C43 corresponding to the shape of the lens portion 43 of the light emitting device 100 , an inclined portion opening C42 corresponding to the shape of the inclined portion 42 , and a fixed portion 41 from the bottom side of the recess C40 to the opening side. The shape corresponds to the fixing portion opening C41.

In the casting case C01 , the bottom side of the recess C40 is arranged vertically downward, and a predetermined amount of material 40A of the molded resin member before curing is injected from the opening side.

(Process of forming a molded resin member)

The step S30 of forming the molded resin member is a step of forming the molded resin member 40 for each pair of the first lead 12 and the second lead 11 . In this step S30, the intermediate body 400 is inserted into the recess C40 filled with the material 40A of the molded resin member, and for each pair of the first lead 12 and the second lead 11, a light-emitting element is formed directly or indirectly. 20 of the molded resin member 40 .

The intermediate body 400 is inserted into the recess C40 so that the connecting portion 310 is exposed from the side on which the light emitting element 20 is mounted, and fixed with the light emitting element 20 disposed in the opening C41 of the fixing portion. The molded resin member 40 is formed by curing the material 40A of the molded resin member by heating or the like, and the cast case C01 is removed after curing.

(single-chip process)

The singulation step S40 is a step of cutting the connecting portion 310 of the connected body 300 . The first bonding portion 123 and the second bonding portion 113 can be formed by cutting a part of the connection portion 310 so as to form protrusions on the first lead 12 and the second lead 11 . The singulation step S40 is completed to complete the light emitting device 100 .

In the method of manufacturing the light emitting device 100 , the first lead 12 and the second lead 11 can be held as a pair by the connecting portion 310 of the connecting body 300 . In addition, the connection body 300 repeatedly connects a pair of the first lead wire 12 and the second lead wire 11 , so that many pairs can be processed together, and the work efficiency can be realized.

In the method of manufacturing the light emitting device 100 , the molded resin member 40 is formed by casting, so that the lens portion 43 , the inclined portion 42 , and the fixing portion 41 can be integrally formed. In addition, by adjusting the shape of the recess C40 of the cast case C01, the molded resin member 40 having a set surface shape can be repeatedly and stably formed.

In the manufacturing method of the light-emitting device 100 , in the singulation step, the connecting portion 310 can be cut so that the first lead 12 and the second lead 11 have the first bonding portion 123 and the second bonding portion 113 . Thus, for example, when the light-emitting device 100 is arranged by inserting the connection end portions 124 and 114 into the mounting substrate 60 described later, the lower surfaces of the first bonding portion 123 and the second bonding portion 113 are aligned with the mounting substrate 60 . 60, the position of the upper end of the lens portion 43 can be aligned.

It should be noted that the step S20 of filling the material of the molded resin member may also be performed together with the subsequent step S30 of forming the molded resin member. That is, in the state where the intermediate body 400 is arranged in the casting case C01 having a plurality of recesses C40, the material 40A of the molded resin member may be filled, and for each group arranged in the recesses C40 of the casting case C01 For the first lead 12 and the second lead 11 , the molded resin member 40 directly or indirectly covering the light emitting element 20 is formed.

In addition, the light emitting devices 101 , 102 , 100A, 140A, and 140B can also be manufactured in the same process by changing the shape of the recess C40 of the mold case C01 . It should be noted that the light emitting device 100 can also be cut to form the molded resin member 40 of a desired shape.

Next, the light source device 200 using the light emitting device 100 will be described with reference to FIGS. 9A and 9B . FIG. 9A is a schematic front view illustrating a part of light source device 200 . 9B is a schematic cross-sectional view illustrating a state in which the light emitting device 100 is mounted on the light source device 200 . It should be noted that instead of the light emitting device 100 , the light emitting devices 101 , 102 , 100A, 140A, 140B and the like described with reference to FIGS. 3A to 6D may be used.

The light source device 200 is a device capable of arranging a plurality of light emitting devices 100 so that the lens portion 43 constitutes a display surface, and controlling the on/off and brightness of each light emitting device 100 . It should be noted that the vertical direction in the light emitting device 100 is a direction perpendicular to the display surface of the light source device 200 . In addition, the light emitting device 100 is arranged so that the X direction becomes the lateral direction on the display surface of the light source device 200 . The inclined portion of the light emitting device 100 is preferably arranged parallel to the lateral direction of the display surface of the light source device 200 . For example, in the light emitting device 100 , when the inclined portions 42 are arranged to face each other along the first direction with the lens portion 43 interposed therebetween, the plurality of light emitting devices are arranged in a direction parallel to the first direction.

In addition, the light source device 200 preferably arranges a plurality of light emitting devices in multiple rows. Furthermore, it is preferable to place three light-emitting devices across adjacent rows among the plurality of rows in a group, and a straight line virtually connecting the centers of the three light-emitting devices in each group forms a triangle. In addition, the plurality of light-emitting devices may also be arranged so that three of the light-emitting devices spanning adjacent rows among the plurality of rows are set as one group, and the centers of the three light-emitting devices in each group are imaginarily connected to the straight line perpendicular to the light source. The direction of the display surface of the device was placed in parallel.

In the light source device 200, light emitting devices 100 having different light emitting colors may be arranged in order. For example, by making the molded resin member 40 contain blue, green, and red colorants, the light emitting device 100 can be configured as a first light emitting device 100a that emits blue light, a second light emitting device 100b that emits green light, and a red light emitting device. The third light emitting device 100c. These three-color light-emitting devices 100 a , 100 b , and 100 c are arranged in a plurality of groups as one pixel, so that a light source device 200 capable of full-color display can be obtained. The arrangement order of the light emitting devices 100a, 100b, and 100c is not limited. It is preferable to arrange the light-emitting device 100b emitting green light in each group of three light-emitting devices at the center. This is because good white color can be obtained by arranging the light-emitting device that emits the light of the wavelength with the most required luminance at the center.

The light source device 200 may also have a louver. Incident light such as sunlight is blocked by the louvers from reaching the display surface of the light source device 200 . The louvers may be arranged for each row, or may be arranged for multiple rows. In the case of the light source device 200 having louvers, it is preferable to arrange light emitting devices with low weather resistance near the louvers.

The light emitting device 100 is mounted on the mounting substrate 60 of the light source device 200 . The overall length of the light emitting device 100 is, for example, not less than 25.5 mm and not more than 29.5 mm. Preferably, it is 26.8 mm or more and 28.5 mm or less. The installation height of the light emitting device 100 from the upper surface of the mounting substrate 60 is determined by the interface between the first joint part 123 and the first connection end part 124 and the second joint part 113 and the second connection end part 124 when the light emitting device 100 is placed on the mounting substrate 60 . The interface of the end portion 114 is set by being bonded to the upper surface of the mounting substrate 60 , so that, for example, the height H10 to the upper end portion of the lens portion 43 can be made equal. The first joint portion 123 and the second joint portion 113 may be formed so as to increase in width in the X direction. The first connection end portion 124 and the second connection end portion 114 are portions inserted into the mounting substrate 60 when the light emitting device 100 is mounted on the mounting substrate 60 . The first connection end portion 124 and the second connection end portion 114 are inserted into the mounting substrate 60 to be connected to external electrodes.

A waterproof member 70 is provided on the mounting substrate 60 so as to embed a part of the molded resin member 40 . In addition, a waterproof member is disposed so as to embed a part of the molded resin member between adjacent light emitting devices. The waterproof member 70 is a member that protects the light emitting device 100 and the mounting substrate 60 from water or the like.

The overlapping thickness H11 of the waterproof member 70 and the molded resin member 40 is, for example, 0.5 mm or more, preferably 1.5 mm or more, and more preferably 3.0 mm or more. Examples of the material of the waterproof member 70 include epoxy resin, modified epoxy resin, silicone resin, modified silicone resin, and the like. In particular, a silicone resin excellent in light resistance and heat resistance is preferably used. In addition, the waterproof member 70 is preferably black resin. By using the black resin, the contrast between the waterproof member 70 and the emitted light becomes higher, and the display by the light source device 200 becomes clearer. In addition, light reflected at the interface between the inclined portion 42 and the outside and traveling toward the mounting substrate 60 can be absorbed. The inclination of the inclined portion 42 is set from an angle at which light passing through the inclined portion 42 among light emitted from the light emitting element 20 can be refracted and emitted parallel to the straight line L1 to an angle at which it can be totally reflected. Due to the inclination of the inclined portion 42 , the light refracted in parallel to the totally reflected light travels toward the mounting substrate 60 side and is absorbed by the waterproof member 70 . Therefore, the area irradiated from the light source device 200 can be adjusted. For example, by narrowing the viewing angle of the light emitting device and adjusting the laterally irradiated area of the display surface of the light source device 200, the brightness of the area to be irradiated by the light source device 200 can be maintained, and the area that does not need to be irradiated and the area that does not want to be irradiated can be suppressed. Leakage of light in the irradiated area, or suppression of its brightness.

Industrial availability

The light emitting device and the light source device according to the embodiment of the present disclosure can be suitably used for an outdoor display. In addition, the light emitting device and the light source device according to the embodiments of the present disclosure can be used in various display devices such as backlight light sources of liquid crystal displays, various lighting fixtures, indoor displays, advertisements, and destination guidance.

Claims (23)

1. A light-emitting device, wherein,

the light-emitting device is provided with:

a light emitting element;

a first lead on which the light-emitting element is mounted;

a second lead electrically connected to the light emitting element via a conductive member, the second lead being disposed apart from the first lead along a first direction; and

a molding resin member directly or indirectly covering the light emitting element,

the molding resin member is provided with:

a lens section located above the light emitting element;

a fixing portion that fixes the first lead and the second lead; and

an inclined portion located between the lens portion and the fixed portion, at least a portion of which is inclined to expand from a boundary with the lens portion toward a boundary with the fixed portion,

the light emitting element is disposed in the fixing portion.

2. The light-emitting device of claim 1, wherein,

the inclined portion is disposed so as to face each other in the first direction with the lens portion interposed therebetween.

3. The light-emitting device according to claim 2, wherein,

the inclined portion is disposed so as to face the lens portion in a second direction orthogonal to the first direction, and an inclination angle of the inclined portion in the first direction is larger than an inclination angle of the inclined portion in the second direction.

4. The light-emitting device according to any one of claims 1 to 3, wherein,

the first and second leads have connection ends exposed from the molding resin member.

5. The light-emitting device according to any one of claims 1 to 4, wherein,

the outer periphery of the fixing portion is larger than the outer periphery of the lens portion in plan view.

6. The light-emitting device according to any one of claims 1 to 5, wherein,

the inclined portion has a flat inclined surface continuous with and inclined from the lens portion and the fixing portion.

7. The light-emitting device according to any one of claims 1 to 5, wherein,

the inclined portion has an inclined surface that is inclined continuously and curvedly to the lens portion and the fixing portion.

8. The light-emitting device according to any one of claims 1 to 7, wherein,

in a cross section taken along the first direction and the third direction, light passing through a connection point of the inclined portion with the lens portion among light emitted from the light emitting element is emitted on a straight line passing through a connection point of the inclined portion with the lens portion and parallel to the first direction or is emitted downward from the parallel straight line,

the third direction is a direction orthogonal to the first direction and a second direction orthogonal to the first direction, and the first lead and the second lead extend.

9. The light-emitting device according to any one of claims 1 to 8, wherein,

the first lead has a recess defined by a sidewall and a bottom plane, and the light emitting element is placed on the plane of the recess.

10. The light-emitting device of claim 9, wherein,

the inclined portion is located above an upper edge of the side wall of the recess.

11. The light emitting device according to claim 9 or 10, wherein,

in a cross section taken along the first direction and the third direction, a connection point of the inclined portion with the fixing portion is located between a straight line passing through an upper end portion of a side wall of the recess and parallel to the first direction, and a straight line connecting an upper end portion of a side surface of the light emitting element near the inclined portion with an upper end portion of the side wall of the recess,

The third direction is a direction orthogonal to the first direction and a second direction orthogonal to the first direction, and the first lead and the second lead extend.

12. The light-emitting device according to any one of claims 9 to 11, wherein,

the upper edge of the fixing portion is located at the same position as or above the upper end of the recess.

13. The light-emitting device according to any one of claims 1 to 12, wherein,

the molding resin member contains a colorant.

14. The light-emitting device according to any one of claims 1 to 13, wherein,

the lens portion and the fixing portion are substantially elliptical in plan view.

15. The light-emitting device according to any one of claims 1 to 14, wherein,

the length of the fixing portion in the first direction is 3.4mm or more and 4.4mm or less in plan view.

16. The light-emitting device according to any one of claims 1 to 15, wherein,

the length of the fixing portion in a second direction orthogonal to the first direction is 2.5mm or more and 3.5mm or less in plan view.

17. The light-emitting device according to any one of claims 1 to 16, wherein,

The longest length of the lens portion is 0.5mm or more and 3.5mm or less in a third direction which is a direction orthogonal to the first direction and a second direction orthogonal to the first direction and in which the first lead and the second lead extend.

18. The light-emitting device according to any one of claims 1 to 17, wherein,

the longest length of the molding resin member is 5.5mm or more and 9.5mm or less in a third direction which is a direction orthogonal to the first direction and a second direction orthogonal to the first direction and in which the first and second leads extend.

19. The light-emitting device according to any one of claims 1 to 18, wherein,

the lens portion, the inclined portion, and the fixing portion are integrally formed.

20. A method for manufacturing a light emitting device, wherein,

the manufacturing method of the light emitting device comprises the following steps:

a step of preparing an intermediate in which a light-emitting element is placed on a first lead of a connecting body in which a pair of first leads and a second lead are repeatedly connected by a connecting portion, and the light-emitting element and the second lead are electrically connected via a conductive member;

a step of filling a material of a molding resin member into a plurality of recesses in a casting case having the recesses;

A step of inserting the intermediate into the recess filled with the material of the molding resin member, and forming a molding resin member directly or indirectly covering the light emitting element for each set of the pair of first leads and the second leads; and

a singulation step of cutting the connection portion of the connection body so as to form the pair of first and second leads,

in the step of filling the material of the molding resin member, the casting case includes a lens portion opening on a bottom side of the casting case, an inclined portion opening continuous from the lens portion opening and extending and inclining toward an opening side of the casting case, and a fixing portion opening continuous from the inclined portion opening and disposed toward the opening side of the casting case,

in the step of forming the molding resin member, the light emitting element is disposed in the fixing portion opening.

21. A light source device, wherein,

the light source device comprises a plurality of light emitting devices and a mounting substrate for mounting the light emitting devices,

the plurality of light emitting devices are the light emitting devices according to any one of claims 1 to 19,

the inclined portion is disposed opposite to each other across the lens portion in the first direction,

The plurality of light emitting devices are arranged in a direction parallel to the first direction.

22. The light source device according to claim 21, wherein,

the plurality of light emitting devices are arranged in parallel to the first direction in a plurality of rows, and are placed at positions where 3 of the light emitting devices crossing adjacent rows among the plurality of rows are set to 1 group, and straight lines virtually connecting centers of the 3 light emitting devices of each group become triangles.

23. The light source device according to claim 21 or 22, wherein,

the light source device includes a waterproof member so as to embed a part of the molding resin member between the adjacent light emitting devices.

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