CN217334129U

CN217334129U - Light emitting device and light source device

Info

Publication number: CN217334129U
Application number: CN202220324785.8U
Authority: CN
Inventors: 大田泰三
Original assignee: Nichia Corp
Current assignee: Nichia Corp
Priority date: 2021-02-17
Filing date: 2022-02-17
Publication date: 2022-08-30
Anticipated expiration: 2032-02-17
Also published as: CN218677189U; JP7513900B2; JP2022125901A

Abstract

The utility model provides a high luminance just can carry out the illuminator and the light source device of the installation of high density. The light-emitting device (100) is provided with a base (10), a light-emitting element (20) mounted on the base (10), and a covering member (40) directly or indirectly covering a part of the base (10) and the light-emitting element (20), wherein the covering member (40) is continuously provided with a lower part (41), an upper part (43), and an intermediate part (42) divided between the lower part (41) and the upper part (43), the light-emitting element (20) is arranged on the upper part (43) or the intermediate part (42), the lower part (41) is in a substantially incomplete ellipse formed by partially incomplete of a substantially oval shape or a substantially oval shape in a plan view, the upper part (43) is in a substantially incomplete circle formed by partially incomplete of a substantially circular shape or a substantially circular shape, and the diameter of the substantially circular shape or the substantially incomplete circle of the upper part is smaller than the major diameter of the substantially oval shape or the substantially incomplete oval shape of the lower part (41).

Description

Light emitting device and light source device

Technical Field

The utility model relates to a light emitting device and light source device.

Background

As a light emitting device, a shell type light emitting device is known. For example, patent document 1 discloses a semiconductor light emitting device having an elliptical shape in plan view.

Prior art documents

Patent document

Patent document 1: japanese patent No. 2809951

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

In the light-emitting device described in patent document 1, there is room for further improvement in terms of high luminance and high density mounting.

An object of an embodiment of the present invention is to provide a light emitting device and a light source device that have high luminance and can be mounted at high density.

Means for solving the problems

The light emitting device according to an embodiment of the present invention includes a base, a light emitting element mounted on the base, and a cover member that covers a part of the base and the light emitting element directly or indirectly, the cover member being formed with a lower portion, an upper portion, and an intermediate portion that is divided between the lower portion and the upper portion continuously, the light emitting element being disposed on the upper portion or the intermediate portion, the lower portion being an approximately incomplete ellipse that is formed by partially incomplete of the approximately ellipse or the approximately ellipse when viewed from above, the upper portion being an approximately incomplete circle that is formed by partially incomplete of the approximately circle or the approximately circle, the diameter of the approximately circle or the approximately incomplete circle on the upper portion being smaller than the major diameter of the approximately ellipse or the approximately incomplete ellipse on the lower portion.

The light source device according to the embodiment of the present invention includes a plurality of light emitting devices; and a mounting board on which the light-emitting devices are mounted such that the lower portion of the cover member faces the mounting board, wherein the plurality of light-emitting devices are arranged in a plurality of rows such that major axes of the substantially elliptical shape or the substantially incomplete elliptical shape of the lower portion are parallel to each other in a plan view, and the light-emitting devices are mounted in a position where a straight line virtually connecting centers of the three light-emitting devices of each group forms a triangle with three of the light-emitting devices crossing an adjacent row among the plurality of rows as a group.

Effect of the utility model

The utility model discloses a light emitting device and light source device hi-lite of embodiment just can carry out the installation of high density.

Drawings

Fig. 1A is a perspective view schematically showing an example of a light-emitting device according to an embodiment.

Fig. 1B is a plan view schematically showing an example of the light-emitting device of the embodiment.

FIG. 1C is a schematic cross-sectional view at the IC-IC line of FIG. 1B.

Fig. 1D is a side view schematically showing an example of a light-emitting device according to the embodiment.

Fig. 2 is a cross-sectional view schematically showing an example of a cup portion of a light-emitting device according to an embodiment.

Fig. 3A is a plan view schematically showing an example of the light source device of the embodiment.

Fig. 3B is a schematic cross-sectional view at line IIIB-IIIB of fig. 3A.

Fig. 4A is a plan view schematically showing an example of the light-emitting device according to the first modification.

Fig. 4B is a side view schematically showing an example of the light-emitting device according to the first modification.

Fig. 4C is a plan view schematically showing an example of a light-emitting device according to a second modification.

Fig. 4D is a plan view schematically showing an example of a light-emitting device according to a third modification.

Fig. 4E is a cross-sectional view schematically showing an example of a light-emitting device according to a fourth modification, and corresponds to a schematic cross-sectional view taken along the IC-IC line in fig. 1B.

Fig. 5A is a front view of the light-emitting device of reference example 1.

Fig. 5B is a rear view of the light-emitting device of reference example 1.

Fig. 5C is a plan view of the light-emitting device of reference example 1.

Fig. 5D is a bottom view of the light-emitting device of reference example 1.

Fig. 5E is a right side view of the light-emitting device of reference example 1.

Fig. 5F is a left side view of the light-emitting device of reference example 1.

Fig. 5G is a sectional view of VG-VG of fig. 5C.

Fig. 5H is a reference sectional view showing a transparent portion.

Fig. 6A is a front view of the light-emitting device of reference example 2.

Fig. 6B is a rear view of the light-emitting device of reference example 2.

Fig. 6C is a plan view of the light-emitting device of reference example 2.

Fig. 6D is a bottom view of the light-emitting device of reference example 2.

Fig. 6E is a right side view of the light-emitting device of reference example 2.

Fig. 6F is a left side view of the light-emitting device of reference example 2.

Fig. 6G is a cross-sectional view of the VIG-VIG of fig. 6C.

Fig. 6H is a reference sectional view showing a transparent portion.

Description of reference numerals:

an abutment;

a first lead;

a first bottom;

a first engagement portion;

a first substrate insertion portion;

a second lead;

a cup portion;

a second bottom;

a second engagement portion;

a second substrate insertion portion;

a recess;

a bottom surface (upward facing surface) of the recess;

an inner side of the recess;

a light emitting element;

a conductive member;

an electrically conductive member;

a light transmissive member;

40. 40B, 40C, 40d.. a cover member;

41. 41A, 41b.. lower;

42. an intermediate portion;

43. 43A, 43b.. upper;

a main body portion;

an upper bend;

a cut-out portion;

a filler;

mounting a substrate;

a waterproof member;

100. 100A, 100B, 100C, 100d.. light emitting device;

a first light emitting device;

a second light emitting device;

a third light emitting device;

a light source device;

diameter;

MA.. major diameter;

MI.. minor diameter;

h1.. height of lower portion;

h2.. the height of the middle section;

h3.. height of upper portion;

h4.. height of the body portion;

h5.. the height from the upper surface of the first joint part and the second joint part to the front end of the upper part;

h1.. height of the recess;

h2.. height of the waterproofing member;

a length from a side surface of the first lead to an inner side surface of the cover member;

a direction;

an angle of inclination of the cover member;

101A, 101b.. light emitting device;

400A, 400b.

410A, 410b.. lower;

420A, 420b.

430A, 430b.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. However, the following embodiments are illustrative of the light emitting device and the light source device, and the method for manufacturing the light emitting device and the method for manufacturing the light source device, which are intended to embody the technical idea of the present embodiment, and are not limited to the following embodiments. The dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention to these, and are merely examples, unless otherwise specified. The sizes, positional relationships, and the like of the members shown in the drawings may be exaggerated or simplified for clarity. In the embodiments, the term "cover" is not limited to the case of direct contact, and includes the case of covering indirectly, for example, with another member interposed therebetween.

Detailed description of the preferred embodiments

Fig. 1A is a perspective view schematically showing an example of a light-emitting device according to an embodiment. Fig. 1B is a plan view schematically showing an example of the light-emitting device of the embodiment. FIG. 1C is a schematic cross-sectional view at the IC-IC line of FIG. 1B. Fig. 1D is a side view schematically showing an example of a light-emitting device according to the embodiment. Fig. 2 is a cross-sectional view schematically showing an example of the cup portion of the light-emitting device according to the embodiment.

[ light-emitting device ]

First, the light-emitting device 100 will be explained.

The light-emitting device 100 includes a base 10, a light-emitting element 20 mounted on the base 10, and a covering member 40 that directly or indirectly covers a part of the base 10 and the light-emitting element 20.

The cover member 40 is formed continuously with a lower portion 41, an upper portion 43, and an intermediate portion 42 that is divided between the lower portion 41 and the upper portion 43, and the light emitting element 20 is disposed on the upper portion 43.

In a plan view, the lower portion 41 has a substantially elliptical shape, the upper portion 43 has a substantially circular shape, and a diameter D of the substantially circular shape of the upper portion 43 is formed smaller than a major diameter MA of the substantially elliptical shape of the lower portion 41.

The light-emitting device 100 includes at least a base 10, a light-emitting element 20, and a cover member 40. The light-emitting device 100 may include the translucent member 30.

The base 10 includes a first lead 11 and a second lead 12 arranged along a first direction X. The first lead 11 is, for example, an anode electrode, and the second lead 12 is, for example, a cathode electrode. From the viewpoint of suppressing silver migration, a lead having a cup-shaped portion 121 described later is preferably used as the cathode electrode. The first lead 11 and the second lead 12 extend from near the center of the upper portion 43 in the vertical direction to below the lower portion 41 in the vertical direction. The lower portion 41 is formed to protrude from a lower surface thereof by a predetermined length.

The first lead 11 has a first base portion 112, a first bonding portion 113 continuous with the first base portion 112, and a first substrate insertion portion 114 continuous with the first bonding portion 113. The first bottom 112 is formed elongated. The upper portion of the first bottom portion 112 covered by the covering member 40 has a concave portion recessed in a direction approaching the second lead 12. The upper end of the first bottom 112 is formed flat so that the conductive member 21 of the light emitting element 20 can be connected thereto. The mounting height of the light-emitting device 100 from the upper surface of the mounting substrate 60 is set so that the interface of the first bonding portion 113 and the first substrate insertion portion 114 is bonded to the upper surface of the mounting substrate 60 when the light-emitting device 100 is mounted on the mounting substrate 60. The first engaging portion 113 may be formed to be wider in width in the direction X. The first substrate insertion portion 114 is a portion into which the mounting substrate 60 is inserted when the light-emitting device 100 is mounted on the mounting substrate 60. The first substrate insertion portion 114 is inserted into the mounting substrate 60 and connected to the external electrode.

The second lead 12 has a cup-shaped portion 121, a second bottom portion 122 continuous with the cup-shaped portion 121, a second bonding portion 123 continuous with the second bottom portion 122, and a second substrate insertion portion 124 continuous with the second bonding portion 123. The upper end of the second bottom portion 122 is formed flat so that the conductive member 22 of the light emitting element 20 can be connected thereto. The cup-shaped portion 121 is provided at the upper end of the second lead 12 and adjacent to the flat surface of the second bottom portion 122. The cup-shaped portion 121 has a recess 15, and the recess 15 has at least a bottom surface 151 and an inner surface 152 as upward surfaces. The recess 15 has an opening expanding toward the upper portion 43 of the cover member 40. The opening of the recess 15 is divided by a bottom surface 151 and an inner side surface 152. The inner surface 152 of the recess 15 is formed obliquely so as to spread from the bottom surface 151 of the recess 15 toward the opening direction of the recess 15. The opening of the recess 15 is formed in a substantially circular shape or a substantially elliptical shape in a plan view, for example. The plan view of the present embodiment shows a view of the state where the light-emitting device 100 is viewed downward from the upper portion 43 side of the cover member 40 in the direction in which the first lead 11 and the second lead 12 extend.

The height h1 of the recess 15 in the direction perpendicular to the bottom surface 151 of the recess 15 from the bottom surface 151 of the recess 15 to the upper surface of the cup-shaped portion 121 is preferably 0.2mm to 0.4 mm. When the height h1 is 0.2mm or more, light emitted from the side of the light-emitting element 20 is reflected by the inner surface 152 of the recess 15, and thus light can be extracted well to the light-emitting element 20. On the other hand, if the height h1 is 0.4mm or less, it is possible to suppress multiple reflections of light emitted from the light-emitting element 20 by the inner surface 152 of the recess 15, and to satisfactorily extract light to the light-emitting element 20. From the viewpoint of further exhibiting the above-described effects, it is more preferably 0.25mm or more and 0.35mm or less.

The second bottom 122 is formed elongated. The upper portion of the second bottom portion 122 covered by the covering member 40 has a concave portion recessed in a direction approaching the first lead 11. The second bonding portion 123 and the second substrate insertion portion 124 have the same configurations as the first bonding portion 113 and the first substrate insertion portion 114, respectively, and are arranged in parallel with the first bonding portion 113 and the first substrate insertion portion 114. The first substrate insertion portion 114 and the second substrate insertion portion 124 are formed in elongated shapes, but the illustration is simplified here.

Examples of the material of the base 10 include iron, copper, iron-containing copper, tin-containing copper, aluminum plated with copper, gold plated with silver, or silver plated with silver, iron, copper, or a combination thereof.

The light emitting element 20 is placed on the bottom surface 151 of the recess 15. The shape, size, and the like of the light emitting element 20 can be arbitrarily selected. The light emitting element 20 has a square, rectangular, or hexagonal shape in plan view, for example. The light emitting color of the light emitting element 20 can be selected from light emitting colors of arbitrary wavelengths according to the application. For exampleAs the light emitting element 20 of blue (light having a wavelength of 430 to 500 nm) and green (light having a wavelength of 500 to 570 nm), the following light emitting elements can be used: using a nitride-based semiconductor (In) _X Al _Y Ga _1-X-Y N, 0. ltoreq. X, 0. ltoreq. Y, X + Y. ltoreq.1), GaP, etc. As the red-based (light having a wavelength of 610 to 700 nm) light-emitting element 20, GaAlAs, AlInGaP, or the like can be used in addition to the nitride-based semiconductor element.

The light emitting element 20 has a pair of electrodes on the upper surface, and is mounted face up on the bottom surface 151 of the recess 15 of the second lead 12. Here, one electrode of the light emitting element 20 is bonded to the first lead 11 via a conductive member 21 such as a wire, and the other electrode is bonded to the second lead 12 via a conductive member 22 such as a wire.

Here, the light emitting element 20 is disposed on the upper portion 43 of the cover member 40. Specifically, the light emitting element 20 is disposed at a substantially center position of a circle of the upper portion 43 in a plan view. The approximate center is not limited to the strict center, but includes a position of a degree of being visually observed to be close to the center. For example, the position may be 10% of the diameter from the center. Further, the light emitting element 20 is disposed at a position around 1/4 of the height of the upper portion 43 in the direction perpendicular to the bottom surface 151 of the recess 15, in a cross-sectional view along the major axis MA of the lower portion 41 and cut in the direction from the upper portion 43 toward the lower portion 41. The light-emitting element 20 may be disposed in the intermediate portion 42. By disposing the light emitting element 20 on the upper portion 43 or the intermediate portion 42, light from the light emitting element 20 is easily emitted from the tip of the upper portion 43, and high luminance can be achieved.

The light-transmitting member 30 is disposed in the recess 15 and covers the light-emitting element 20. In the light-emitting device 100, the translucent member 30 is provided in the recess 15, so that the covering member 40 does not directly contact the light-emitting element 20, and the covering member 40 is not disposed in the vicinity of the light-emitting element 20, whereby deterioration of the covering member 40 due to heat of the light-emitting element 20 can be suppressed. This can extend the life of the light-emitting device 100.

Examples of the material of the light-transmissive member 30 include light-transmissive resins such as epoxy resin, urea resin, acrylic resin, and silicone resin, and glass. The translucent member 30 is a translucent member or a transparent body. The translucent member 30 may contain a filler 50 such as a diffusing material. By including the filler 50 in the light-transmissive member 30, the light distribution variation can be reduced. Examples of the filler 50 include barium titanate, titanium oxide, aluminum oxide, and silicon oxide.

The light-transmitting member 30 may contain a colorant. As the colorant, for example, a colorant including any one of a pigment and a dye can be cited. The pigment is not particularly limited, and examples thereof include pigments using inorganic materials and organic materials, and pigments using the following materials.

Examples of the inorganic material include red iron (Fe) ₂ O ₃ ) Lead (Pb) ₃ O ₄ ) Titanium-nickel-antimony-based oxides, titanium-nickel-barium-based oxides, titanium-chromium-antimony-based oxides, titanium-chromium-niobium-based oxides, and the like.

Examples of the organic material include anthraquinone-based, azo-based, quinacridone-based, perylene-based, diketopyrrolopyrrole-based, monoazo-based, disazo-based, pyrazolone-based, benzimidazolone-based, quinoxaline-based, methylamine-based, isoindolinone-based, and isoindoline-based materials.

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

The pigment and the dye are preferably such that light from the light emitting element 20 is not substantially converted into a different wavelength. This is because, when the wavelength conversion member is included as described later, the wavelength conversion member is not affected.

The light-transmitting member 30 may contain a light stabilizer. Examples of the light stabilizer include benzotriazole-based, benzophenone-based, salicylate-based, cyanoacrylate-based, and hindered amine-based light stabilizers.

The light-transmitting member 30 may contain a wavelength conversion member. The wavelength conversion member may be a phosphor. Examples of the phosphor include yttrium aluminum garnet activated with cerium, lutetium aluminum garnet activated with cerium, terbium aluminum garnet activated with cerium, calcium aluminosilicate containing nitrogen activated with either or both of europium and chromium, sialon activated with europium, silicate activated with europium, potassium silicate fluoride activated with manganese, nitride phosphor activated with europium, and phosphor having a perovskite structure (e.g., CsPb (F, Cl, Br, I)) ₃ ) Or quantum dot phosphors (e.g., CdSe, InP, AgInS) ₂ Or AgInSe ₂ ) And the like.

The covering member 40 covers a part of the base 10 and the light emitting element 20. In the present embodiment, the covering member 40 indirectly covers the light emitting element 20 through the translucent member 30. The cover member 40 is provided to protect the light emitting element 20, the

conductive members

21 and 22 such as the lead wires, the translucent member 30, and the like from the external environment. The cover member 40 is provided to form the light-emitting device 100 having a desired directivity characteristic, i.e., a desired half-value angle.

The cover member 40 has a lower portion 41, an intermediate portion 42 continuous with the lower portion 41, and an upper portion 43 continuous with the intermediate portion 42. The lower portion 41, the intermediate portion 42, and the upper portion 43 are integrally formed continuously.

The lower portion 41 is positioned at a lower portion of the cover member 40, and is mounted on the mounting board 60 such that a lower surface of the lower portion 41 faces the mounting board 60. The lower portion 41 has a substantially elliptical shape in plan view.

The substantially elliptical shape of the present embodiment is not limited to a case where the locus of a point having a constant sum of distances from two fixed points on one plane, i.e., a strictly elliptical shape, but includes a shape that is close to an elliptical shape in visual observation. For example, the shape may be an oblong shape in which a circle is extended in one direction, an elliptical shape, a track shape for track and field games, or the like. That is, the substantially elliptical shape also includes a shape surrounded by a pair of straight lines or curved lines extending in the longitudinal direction or the short-side direction and a pair of curved lines connected to the pair of straight lines or curved lines and curved convexly outward. For example, the shape may be one in which the same-side end portions of two parallel sides facing each other or two curved sides facing each other are connected to each other by arcs of the same diameter (for example, semicircular arcs). In this case, the major axis of the substantially elliptical shape is the length of the longest portion in the longitudinal direction. For example, the length is from the outermost end of the arc of the semicircle to the outermost end of the arc of the semicircle. The semi-circle described here is a semi-circle formed from a substantially circular shape by a straight line passing perpendicularly to the longitudinal direction of the substantially elliptical shape. The minor axis of the substantially elliptical shape is the length of the longest portion in the direction perpendicular to the major axis. For example, the length of a straight line perpendicular to the center of the major axis of the substantially elliptical shape.

In the light-emitting device 100, when the lower portion 41 has a substantially elliptical shape in a plan view, the surface facing the mounting board 60 has a substantially elliptical shape. Therefore, high-density mounting can be performed. For example, as described later, when three light emitting devices 100 are mounted as a set on the mounting board 60, one light emitting device 100 can be mounted close to the short diameter direction of the substantially elliptical shape.

The substantially elliptical major axis MA of the lower portion 41 is parallel to the one direction X in a plan view. According to such a configuration, since the first lead 11 and the second lead 12 are arranged along the one direction X, when the plurality of light emitting devices 100 are mounted on the mounting substrate 60, the light emitting devices can be easily mounted with the substantially elliptical major axis MA parallel to the mounting direction. The parallelism in the present embodiment is not limited to a strict parallelism, and includes a degree of deviation within a range of tolerance or error due to manufacturing.

Further, in a cross-sectional view taken along the major axis MA of the lower portion 41 and cut in the direction from the upper portion 43 toward the lower portion 41, the length in the vertical direction from the side surface of the first lead 11 facing the cover member 40 to the inner side surface of the cover member 40 can be increased. The vertical direction here means a direction parallel to the bottom surface 151 of the recess 15. By increasing the length, cracks caused by thermal stress can be prevented from reaching the inner side surface of the covering member 40. The length L is preferably 0.3mm or more from the viewpoint of reliability of the light-emitting device 100, and is preferably 0.5mm or less from the viewpoint of downsizing the light-emitting device 100. For the same reason, the length in the vertical direction from the side surface of the second lead 12 to the inner side surface of the cover member 40 is preferably 0.3mm or more, and preferably 0.5mm or less.

The lower portion 41 has a substantially trapezoidal shape in a cross-sectional view taken along the major axis MA of the lower portion 41 and cut in a direction from the upper portion 43 toward the lower portion 41, and the upper side (upper bottom) of the substantially trapezoidal shape is formed shorter than the lower side (lower bottom). The cross-sectional shape of the lower portion 41, that is, the inclination of the straight lines that form the left side (left leg) and the right side (right leg) of the substantially trapezoidal shape is the same. Here, the lower portion 41 is formed in a substantially truncated elliptical cone shape. By forming the lower portion 41 with the upper side shorter than the lower side, the cover member 40 can be easily pulled out from the cast housing for molding the cover member 40 when manufacturing the light emitting device 100.

Here, the substantially trapezoidal shape of the present embodiment is not limited to a strictly trapezoidal shape in which a pair of opposite sides in a quadrilateral are parallel, and includes a shape that is close to a trapezoidal shape in visual observation. For example, the present invention also includes a non-parallel form in which the upper side and the lower side are not completely parallel, and a form in which one or both of the upper side and the lower side are curved instead of linear. Further, the present invention also includes a configuration in which one or both of the left and right sides of the trapezoid are curved instead of straight. For example, the upper side and the lower side may be parallel or non-parallel, and one or both of the left side and the right side of the trapezoid may be straight or curved. The same applies to the substantially trapezoidal shape of the other portions.

The substantially elliptical truncated cone of the present embodiment is not limited to a strictly elliptical truncated cone, and includes a shape close to an elliptical truncated cone in visual observation. For example, the cross-sectional shape of the recess 15 cut parallel to the bottom surface 151 may be the above-described substantially elliptical shape. In a cross-section taken along the major axis MA of the lower portion 41 and cut in a direction from the upper portion 43 toward the lower portion 41, it may be substantially trapezoidal. In a cross-sectional view taken along the minor axis MI of the lower portion 41 and cut in the direction from the upper portion 43 toward the lower portion 41, it is sufficient if the cross-sectional view is substantially trapezoidal.

The height H1 of the lower portion 41 in the direction perpendicular to the bottom surface 151 of the recess 15 is not particularly limited, and may be set as appropriate within a range in which the height from the lower surface of the cover member 40 to the upper surface of the first engagement portion 113 is not changed. For example, 2.3mm to 4.0 mm. By increasing the height H1 of the lower portion 41, the path through which moisture enters the light-emitting device 100 from the waterproof member 70 described later along the first bottom portion 112 of the first lead 11 and the second bottom portion 122 of the second lead 12 can be increased.

The intermediate portion 42 is a portion defined between the lower portion 41 and the upper portion 43. The intermediate portion 42 connects the portions of different sizes. The intermediate portion 42 is provided at a position that covers at least the bottom surface 151 of the recess 15 from a position that does not affect the light distribution of the light emitted from the upper portion 43 (for example, the lower portion of the upper portion 43) when viewed along the major axis MA of the lower portion 41 and cut in the direction from the upper portion 43 toward the lower portion 41. Intermediate portion 42 may be provided so as to substantially cover the concave portion of first lead 11 and the concave portion of second lead 12.

The intermediate portion 42 has a shape that continuously changes from a substantially elliptical shape to a substantially circular shape in a direction from the lower portion 41 to the upper portion 43 in a plan view. The intermediate portion 42 has a substantially trapezoidal shape with an upper side shorter than a lower side in a cross-section taken along the major axis MA of the lower portion 41 and cut in a direction from the upper portion 43 toward the lower portion 41. The left and right sides of the substantially trapezoidal shape of the intermediate portion 42 are straight lines, and the left and right sides of the straight lines are inclined to the same degree. The intermediate portion 42 is formed in a substantially truncated elliptical cone shape in which the boundary surface between the upper portion 43 and the intermediate portion 42 is substantially circular and the boundary surface between the intermediate portion 42 and the lower portion 41 is substantially elliptical. The boundary surface mentioned above refers to a case where the cutting is performed in a direction parallel to the bottom surface 151 of the recess 15. In the light-emitting device 100, the cover member 40 has the intermediate portion 42, and therefore, when mounted on the mounting board 60, water can be prevented from accumulating at the connecting portion between the upper portion 43 and the intermediate portion 42 and the connecting portion between the intermediate portion 42 and the lower portion 41.

Since the cover member 40 has the intermediate portion 42, rainwater and the like adhering to the intermediate portion 42 easily flow. This is because the outer angle of the connecting portion between the upper portion 43 and the intermediate portion 42 is an obtuse angle when viewed in a cross section taken along the major axis MA of the lower portion 41 and taken in a direction from the upper portion 43 toward the lower portion 41. Since the outer angle of the connecting portion is an obtuse angle, the connecting portion is less susceptible to surface tension.

The height H2 of the intermediate portion 42 in the direction perpendicular to the bottom surface 151 of the recess 15 is not particularly limited, and may be set as appropriate within a range in which the height from the lower surface of the cover member 40 to the upper surface of the first joining portion 113 is not changed. For example, 0.75mm to 2.7 mm.

The upper portion 43 is substantially circular in plan view. The substantially circular shape of the present embodiment is not limited to a strictly circular shape such as a perfect circle, and includes a shape close to a circular shape in visual observation. For example, the circle may be distorted or deformed within a tolerance or an error. Specifically, the length of the metal member is 5% or less of the diameter. When the length of the diameter exceeds 5%, the shape becomes substantially elliptical. In consideration of the influence on the light distribution characteristics, the dimensional tolerance is preferably 0.05 mm. More preferably with a dimensional tolerance of 0.02 mm. For example, the shape may be a polygon having an outer shape of a circle of at least an octagon, a shape having a concavity and a convexity on the circumference, a shape having a straight line formed in a part of a circle, a shape having corners of a polygon chamfered into an arc shape or a curved shape having a small curvature, a shape having an arc without an angle, or the like.

The upper portion 43 includes a main body 431 and an upper curved portion 432 continuously provided on the main body 431. The body 431 is integrally formed with the upper bent portion 432.

The body 431 is located below the upper portion 43 and is formed continuously and integrally with the intermediate portion 42. The body 431 has a substantially circular shape in plan view. The body 431 has a substantially rectangular shape in cross section along the substantially circular diameter D and cut in the direction from the upper portion 43 to the lower portion 41. The substantially rectangular shape of the present embodiment is not limited to a strictly rectangular shape, and includes a shape that is close to a rectangular shape when viewed visually. For example, the present invention also includes a non-parallel form in which the upper side and the lower side are not completely parallel, and a form in which one or both of the upper side and the lower side are curved instead of linear. The present invention also includes a non-parallel form in which the left and right sides are not completely parallel, and a form in which one or both of the left and right sides are curved instead of linear. For example, the cover member 40 may have a substantially rectangular shape with an upper side slightly shorter than a lower side and left and right sides slightly nonparallel to each other, so that the cover member has a tapered shape.

The body 431 is formed in a substantially cylindrical shape. Here, the substantially cylindrical shape of the present embodiment may have a substantially circular shape as described above, for example, as long as the cross section cut parallel to the bottom surface 151 of the recess 15.

The height H4 of the main body 431 in the direction perpendicular to the bottom surface 151 of the recess 15 is not particularly limited, and may be set as appropriate within a range in which the height from the lower surface of the cover member 40 to the upper surface of the first engagement portion 113 is not changed. For example, 1.3mm to 3.2 mm.

The upper bent portion 432 is formed in an arc shape so as to protrude upward in a cross section taken in a direction from the upper portion 43 toward the lower portion 41. For example, the cover member 40 may be formed in a shape in which the front end of the upper portion 43 is curved in an arc shape in cross section.

In the light-emitting device 100 of the present embodiment, the shape of the upper portion 43 is formed into a substantially circular shape in a plan view, whereby diffusion of the light distribution of the light emitted from the light-emitting element 20 can be suppressed, and high luminance can be achieved.

The curvature radius of the curve of the upper curved portion 432 is, for example, 1.4mm or more and 1.6mm or less. The height H3 of the upper portion 43 in the direction perpendicular to the bottom surface 151 of the recess 15 is not particularly limited, and may be set as appropriate within a range in which the height from the lower surface of the cover member 40 to the upper surface of the first engagement portion 113 is not changed. For example, 2.5mm or more and 5.0mm or less.

The substantially circular diameter D of the upper portion 43 is smaller than the substantially elliptical major diameter MA of the lower portion 41. The ratio of the substantially circular diameter D of the upper portion 43 to the substantially elliptical major diameter MA of the lower portion 41 is preferably 1.001 or more and less than 1.34, where the substantially circular diameter D of the upper portion 43 is 1. More preferably 1.2 or more and 1.3 or less. Such a ratio enables the light-emitting device 100 to have higher luminance and to be mounted with higher density.

As an example, when the diameter D of the circle of the upper portion 43 is 1, the minor diameter MI of the circle of the lower portion 41 is preferably 1 to 1.1, where the ratio of the diameter D of the circle of the upper portion 43 to the minor diameter MI of the circle of the lower portion 41 is set to 1. With such a ratio, the cover member 40 can be easily pulled out from the cast housing for molding the cover member 40 when manufacturing the light-emitting device 100.

For example, the cover member 40 preferably has a substantially elliptical major diameter MA of the lower portion 41 of substantially 3.9mm, a substantially elliptical minor diameter MI of the lower portion 41 of substantially 3.1mm, and a substantially circular diameter D of the upper portion 43 of substantially 3 mm. With such a configuration, the light-emitting device 100 can have higher luminance and can be mounted with higher density. In addition, when the light emitting device 100 is manufactured, the cover member 40 is easily pulled out from a cast housing for molding the cover member 40.

Here, for example, approximately 3.9mm means a value obtained by adding or subtracting a dimensional tolerance of 0.3mm to or from 3.9 mm. Specifically, approximately 3.9mm is 3.9 mm. + -. 0.3 mm. Similarly, approximately 3.1mm is 3.1 mm. + -. 0.3mm, and approximately 3mm is 3 mm. + -. 0.3 mm.

As shown in fig. 1D, the cover member 40 may be tapered such that the side surfaces in the front-rear direction are tapered from below toward above. In this case, the upper portion 43 is formed in a tapered shape so as to be substantially circular in a plan view. By forming the cover member 40 in such a shape, the cover member 40 can be easily pulled out from the cast housing for molding the cover member 40 when manufacturing the light emitting device 100. The angle α of inclination is preferably 0.2 ° or more and 2.0 ° or less. If the angle α is 0.2 ° or more, the light distribution characteristics are easily changed. This is because the curvature radius of the upper curved portion 432 of the upper portion 43 that can be designed becomes larger because the inclination angle is small. On the other hand, if the angle α is 2.0 ° or less, the light-emitting device 100 can be downsized.

Examples of the material of the covering member 40 include a light-transmitting resin having excellent weather resistance such as epoxy resin, urea resin, and silicone, and glass. The cover member 40 is a member having light transparency or a transparent body.

The cover member 40 may also contain a colorant. For example, by containing a blue colorant, a green colorant, or a red colorant, the light-emitting device 100 that emits blue light, the light-emitting device 100 that emits green light, and the light-emitting device 100 that emits red light can be formed. By using these light-emitting devices 100, a light source device 200 capable of full-color display can be manufactured. The cover member 40 may contain a filler such as a diffusing material, a light stabilizer, a phosphor, and the like. As the colorant, filler, light stabilizer, and phosphor, those described in the light-transmissive member 30 can be used.

The light-emitting device 100 is preferably driven at a half-value angle of 27 ° or more and 30 ° or less. This can further improve the luminance of the light-emitting device 100. Therefore, the cover member 40 is preferably designed so that the half-value angle becomes this range.

In the light-emitting device 100, the height H5 from the upper surfaces of the first bonding portion 113 and the second bonding portion 123 to the tip of the upper portion 43 in the direction perpendicular to the bottom surface 151 of the recess 15 is, for example, 9.0mm or more and 10.5mm or less.

[ 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 11 and the second lead 12, and the light emitting element 20 emits light. Light emitted from the light emitting element 20 traveling upward is extracted to the outside above the light emitting device 100 via the upper portion 43 of the cover member 40. The light traveling downward is reflected by the bottom surface 151 of the recess 15, is emitted in the opening direction of the recess 15, and is taken out to the outside of the light-emitting device 100 through the upper portion 43 of the cover member 40. The light traveling in the lateral direction is reflected by the inner surface 152 of the recess 15, is emitted in the opening direction of the recess 15, and is extracted to the outside of the light-emitting device 100 through the upper portion 43 of the cover member 40. In this case, in the present embodiment, since the upper portion 43 of the covering member 40 has a substantially circular shape in plan view, the spread of the light distribution of the light emitted from the light emitting element 20 is suppressed, and the luminance of the light emitting device 100 is increased.

[ method for producing light-emitting device ]

Next, an example of a method for manufacturing the light-emitting device 100 will be described.

The method for manufacturing the light-emitting device 100 includes a base preparation step, a light-emitting element mounting step, a conductive member bonding step, a translucent member forming step, and a covering member forming step.

The material, arrangement, and the like of each member are as described in the above description of the light-emitting device 100, and therefore, the description thereof is appropriately omitted here.

The base preparation step is a step of preparing the first lead 11 and the second lead 12 to be the base 10. In this step, for example, the first lead 11 and the second lead 12 formed into desired shapes are formed on the base frame.

The light emitting element mounting step is a step of mounting the light emitting element 20 on the base 10. In this step, the light emitting element 20 is mounted on the bottom surface 151 of the recess 15 of the second lead 12 via the adhesive member.

The conductive member bonding step is a step of bonding the light emitting element 20 to the first lead 11 and the second lead 12 by using

conductive members

21 and 22 such as wires. In this step, one electrode of the light-emitting element 20 is bonded to the first wire 11 via the conductive member 21, and the other electrode is bonded to the second wire 12 via the conductive member 22.

The light-transmissive member forming step is a step of forming the light-transmissive member 30 in the recess 15 of the second lead 12. In this step, after injecting a resin or the like for the light-transmissive member into the recess 15 of the second lead 12, the resin or the like is cured to form the light-transmissive member 30.

The covering member forming step is a step of forming the covering member 40 that directly or indirectly covers a part of the base 10 and the light emitting element 20. In this step, first, a cast housing such as a mold that is molded in conformity with the shape of the covering member 40 is prepared. Next, resin or the like for the covering member is injected into the cast case, and the first lead 11 and the second lead 12 are immersed in the cast case. Then, the resin for the covering member or the like is cured to form the covering member 40.

Then, the cover member 40 is pulled out from the cast housing, and the first lead 11 and the second lead 12 are cut off from the base frame to form the light emitting device 100.

[ light Source device ]

Next, the light source device 200 will be described.

Fig. 3A is a plan view schematically showing an example of the light source device of the embodiment. Fig. 3B is a schematic cross-sectional view at line IIIB-IIIB of fig. 3A.

The light source device 200 includes the plurality of light emitting devices 100 having the above-described configuration, and the mounting board 60 on which the light emitting devices 100 are mounted so as to face the lower portion 41 of the cover member 40. The plurality of light emitting devices 100 are arranged in a plurality of rows on the mounting substrate 60 so that the major axes MA of the substantially elliptical shapes of the lower portion 41 are parallel to each other in a plan view.

The plurality of light emitting devices 100 preferably have a substantially elliptical major axis MA of the lower portion 41 arranged parallel to the left-right direction. In the plurality of light emitting devices 100, three light emitting devices 100 arranged in adjacent rows among the rows arranged in a plurality of rows on the mounting substrate 60 are grouped, and the light emitting devices 100 are placed at positions where straight lines virtually connecting the centers of the three light emitting devices 100 in each group form a triangle. By arranging the virtual lines in a triangle, the three light emitting devices 100 of each group can be placed close to each other. Therefore, high-density mounting can be performed.

The light source device 200 includes at least the light emitting device 100, the mounting substrate 60, and the waterproof member 70.

The light emitting device 100 is as described above.

The mounting board 60 is a member on which the light emitting device 100 is mounted, and electrically connects the light emitting device 100 to the outside. The mounting substrate 60 has wiring formed in advance on an insulating substrate.

The insulating substrate of the mounting substrate 60 is preferably made of an insulating material, and is preferably made of a material that is not easily transmitted by light emitted from the light-emitting element 20, external light, or the like. For example, ceramics such as alumina, aluminum nitride, and mullite, a thermoplastic resin such as PA (polyamide), PPA (polyphthalamide), PPS (polyphenylene sulfide), or a liquid crystal polymer, an epoxy resin, a silicone resin, a modified epoxy resin, a urethane resin, or a phenol resin can be used.

The light source device 200 has a plurality of light emitting devices 100 mounted on a mounting substrate 60. The light-emitting device 100 is mounted on the mounting substrate 60 by inserting the first substrate insertion portion 114 of the first lead 11 and the second substrate insertion portion 124 of the second lead 12 into the mounting substrate 60. Three types of light-emitting devices 100, namely, a first light-emitting device 100a that emits blue light, a second light-emitting device 100b that emits green light, and a third light-emitting device 100c that emits red light, are used as the light-emitting devices 100. Here, the first light-emitting device 100a, the second light-emitting device 100b, and the third light-emitting device 100c each contain a blue colorant, a green colorant, and a red colorant in the covering member 40. The plurality of light emitting devices 100 are arranged such that three of the first light emitting device 100a, the second light emitting device 100b, and the third light emitting device 100c are arranged in one group, and a straight line connecting three centers of the groups virtually forms a triangle. The first light-emitting device 100a, the second light-emitting device 100b, and the third light-emitting device 100c, when all of the one group is turned off, appear to be a color darker than the color colored by subtractive color mixing of the colors of the respective light-emitting devices, that is, a color with low luminance. Therefore, the contrast of the light source device 200 can be improved. Further, the distance between the light emitting devices 100 can be shortened by making the imaginary straight line into a triangle. Therefore, the color mixture of the light emitted from the light-emitting device 100 is improved, and the color mixture of the light source device 200 can be improved.

In the light source device 200, each group of three first, second, and third light-emitting

devices

100a, 100b, and 100c constitutes one pixel. In fig. 3A, the first light-emitting device 100a is disposed on the left side, the second light-emitting device 100b is disposed on the right side, the third light-emitting device 100c is disposed on the front side, and the first light-emitting device 100a, the second light-emitting device 100b, and the third light-emitting device 100c of each group are mounted on the mounting board 60 in the same arrangement.

In the light emitting device 100, since the surface facing the mounting board 60 has a substantially elliptical shape, the distance between the third light emitting device 100c and the first and second

light emitting devices

100a and 100b can be shortened as compared with the case of a substantially circular shape having the same diameter as the major axis of the substantially elliptical shape. Therefore, high-density mounting can be performed.

The waterproof member 70 is a member for protecting the light source device 200 from water and the like, and is provided on the upper surface of the mounting substrate 60. The upper surface of the mounting substrate 60 is a surface on which the light-emitting device 100 is mounted. The upper surface of the waterproof member 70 is preferably located at a position equal to or higher than the position covering the lower surface of the lower portion 41 and equal to or lower than the vicinity of the boundary between the upper portion 43 and the intermediate portion 42, and more preferably equal to or lower than the vicinity of the boundary between the lower portion 41 and the intermediate portion 42. The waterproof member 70 covers the lower surface of the lower portion 41 to a predetermined height, thereby ensuring waterproofness. The waterproof member 70 covers the lower portion 41 and the intermediate portion 42, thereby further improving the waterproof property. Further, by disposing the waterproof member 70 at a predetermined height from the lower surface of the lower portion 41 to the intermediate portion 42, the amount of the waterproof member 70 used can be reduced without affecting the light distribution characteristics of the light emitting device 100. For example, the upper surface of the waterproof member 70 is located at a position of 0.5mm or more, preferably 1.5mm or more, and more preferably 3.0mm or more in the upward direction from the lower surface of the lower portion 41.

The height h2 of the waterproof member 70 in the direction perpendicular to the bottom surface 151 of the recess 15 is a height from the upper surface of the mounting substrate 60. That is, the height h2 of the waterproof member 70 corresponds to a height obtained by summing up a height from the interface between the first joining portion 113 and the first board insertion portion 114 to the lower surface of the lower portion 41 of the cover member 40 and a height from the lower surface of the lower portion 41 of the cover member 40 to the upper surface of the waterproof member 70.

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 having excellent 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 of the waterproof member 70 with the emitted light becomes higher, and the display of the light source device 200 becomes brighter.

Examples of the black resin include resins containing fillers such as acetylene black, carbon such as activated carbon and graphite, transition metal oxides such as iron oxide, manganese dioxide, cobalt oxide and molybdenum oxide, and colored organic pigments. The density of the black color may be adjusted by the amount of the filler added.

[ method for manufacturing light Source device ]

Next, an example of a method for manufacturing the light source device 200 will be described.

The method for manufacturing the light source device 200 includes a light emitting device preparation step, a light emitting device mounting step, and a waterproof member forming step.

The material, arrangement, and the like of the respective members are as described in the above description of the light source device 200, and therefore, the description thereof is appropriately omitted here.

The light-emitting device preparation step is a step of preparing the light-emitting device 100 described above. In this step, for example, the light-emitting device 100 is manufactured by the above-described method for manufacturing the light-emitting device 100.

The light-emitting device mounting step is a step of mounting the light-emitting device 100 on the mounting substrate 60 so that the lower portion 41 of the cover member 40 faces the mounting substrate 60. In this step, the first substrate insertion portion 114 of the first lead 11 and the second substrate insertion portion 124 of the second lead 12 are inserted into the mounting substrate 60. Then, the lower surfaces of the first bonding portion 113 and the second bonding portion 123 are bonded to the upper surface of the mounting substrate 60 by solder plating or the like.

The waterproof member forming step is a step of providing the waterproof member 70 on the upper surface of the mounting substrate 60. In this step, the resin for the waterproof member is disposed so that a part or the whole of the lower portion 41 of the light-emitting device 100 is embedded. Then, the resin is cured to form the waterproof member 70.

As described above, the light emitting device 100 and the light source device 200 according to the embodiment have a substantially cylindrical shape with the tip end bent in a convex shape, and thus have high luminance, and have a substantially elliptical shape in a plan view on the base end side, and thus the light emitting device 100 can be mounted on the mounting substrate 60 at high density. This enables the light source device 200 to be more precise.

While the light-emitting device 100 and the light source device 200 have been specifically described in the above with reference to the specific embodiments, the gist of the present invention is not limited to these descriptions, and it is necessary to broadly explain the present invention based on the technical solutions. The gist of the present invention also includes embodiments in which various changes and modifications are made based on these descriptions.

Modifications of the examples

Fig. 4A to 4E are plan views schematically showing examples of the light-emitting device according to the first to fourth modifications, respectively. Fig. 4E corresponds to a schematic cross-sectional view at an IC-IC line of fig. 1B.

In the light emitting device 100A, the lower portion 41A of the covering member 40A has a substantially elliptical shape in which one end in the short diameter MI direction of the substantially elliptical shape is cut away in a plan view, and the upper portion 43A of the covering member 40A has a substantially circular shape in which a part of the substantially circular shape is cut away in a plan view. The light-emitting device 100A has a shape that is cut parallel to the major axis MA of the lower portion 41A and continuously and vertically from the upper portion 43A to the lower portion 41A. Therefore, the cutting portion of the substantially incomplete circle and the cutting portion of the substantially incomplete ellipse overlap each other in a plan view. Here, the light emitting device 100A has a notch 47, which is a plane parallel to the position of the major axis MA of the lower portion 41A, on the rear side. The light-emitting device 100A has a shape in which a part of the rear side is cut parallel to the major axis MA of the lower portion 41A in a plan view.

The other points are the same as those of the light-emitting device 100.

The light-emitting device 100A has the cutout 47, and thus can distinguish between the anode side and the cathode side. The cutout portion 47 can be provided by matching the shape of the cast housing for molding the cover member 40A with the shape of the cover member 40A. Further, the light extraction of the light emitting device 100A increases the total reflected light in the notch 47, and the light can be extracted strongly from the lower side of the light emitting device 100A.

As described in the light-emitting device 100, the substantially incomplete ellipse is not limited to the incomplete ellipse in which one end of the ellipse is incomplete in a strict sense, and includes the incomplete one end of a shape that is close to the elliptical shape in a visual observation. I.e. one end of the substantially elliptical shape is missing. Depending on the shape, the substantially incomplete ellipse may be included in the substantially elliptical shape.

As described above with reference to the light-emitting device 100, the substantially incomplete circle is not limited to a strictly circular shape, and includes a shape in which one end of a shape is incomplete to the extent that the shape is circular when viewed visually. I.e. a substantially circular end is missing. Depending on the shape, the substantially incomplete circle may be included in the substantially circular shape.

When the lower portion 41A has a substantially incomplete ellipse shape in a plan view, the minor axis MI of the substantially incomplete ellipse is a value measured with respect to the minor axis MI of a portion having no incomplete portion. That is, the minor axis MI of the substantially incomplete ellipse is a length obtained by removing a part of the incomplete shape from the minor axis MI of the substantially elliptical shape shown in fig. 1B in a state where one end of the minor axis MI is not incomplete. For example, the length in the direction perpendicular to the longitudinal direction of the substantially incomplete ellipse means the length connecting two points having the longest length. When the upper portion 43A has a substantially incomplete circle in a plan view, the diameter D of the substantially incomplete circle is measured with respect to the diameter D in a direction in which a portion is not incomplete. That is, the diameter D of the substantially incomplete circle means the diameter D of the substantially circular shape with no incomplete end.

The size of the notch 47 is not particularly limited as long as it can be visually confirmed. The substantially incomplete circle is preferably cut in parallel with the major axis MA of the lower portion 41A at a position of a diameter D of the substantially circular shape with no incomplete end, for example, a position of 1/10 or more and 1/5 or less. The substantially incomplete ellipse is preferably cut in parallel with the major axis MA of the lower portion 41A at a position where the minor axis MI of the substantially ellipse without a defect at one end is between 1/10 and 1/5, for example.

In the light emitting device 100B, the lower portion 41B of the covering member 40B has a substantially incomplete ellipse shape in which one end in the short diameter MI direction of the substantially ellipse is incomplete in a plan view, and the upper portion 43 of the covering member 40B has a substantially circular shape in a plan view.

The other matters are the same as those of the light-emitting device 100.

In the light-emitting device 100B, since one end of the upper portion 43 of the cover member 40B is not left intact, a portion for distinguishing the anode side from the cathode side can be provided without changing the light distribution of the light-emitting device 100.

In the light-emitting device 100C, the lower portion 41 of the covering member 40C is substantially elliptical in plan view, and the upper portion 43B of the covering member 40C is substantially incomplete circular in plan view, in which a part of a substantially circle is incomplete.

The other points are the same as those of the light-emitting device 100.

As described above, the cutout portion 47 may be provided only in the lower portion 41B, or the cutout portion 47 may be provided only in the upper portion 43B. Further, the lower portion may be a substantially truncated oval shape in which one end in the major axis MA direction of the substantially oval shape is truncated in a plan view. The position and shape of the notch 47 may be any position and shape as long as the function of the light-emitting device is not impaired, and for example, the notch may be convex inward, curved inward, or V-shaped in a plan view.

When the lower portion has a substantially incomplete ellipse shape in a plan view, the major axis MA of the substantially incomplete ellipse shape is a value measured with respect to the major axis MA of a portion having no incomplete shape. That is, the major axis MA of the substantially elliptical shape having one end without a defect shown in fig. 1B is a length obtained by removing a part of the defect from the major axis MA of the substantially elliptical shape. For example, on a straight line perpendicular to the short side direction of the substantially incomplete ellipse, the length is a length connecting two points having the longest length.

In the light-emitting device 100D, the left and right sides of the substantially trapezoidal shape of the intermediate portion 42A are bent outward in cross section. In the light-emitting device 100D, even if the intermediate portion 42A has such a shape, water can be prevented from accumulating on the side surface of the covering member 40D when mounted on the mounting board 60.

The curvature radius of the left and right curves of the substantially trapezoidal shape is preferably 1.5mm or more and 2.0mm or less. If the radius of curvature is 1.5mm or more, water is less likely to accumulate on the side surface of the covering member 40D. From the viewpoint of improving the reliability of the light-emitting device 100, more preferably 1.86mm or more. On the other hand, if the radius of curvature is 2.0mm or less, the casting shell can be easily removed.

The light emitting device may have a curved shape in which the left and right sides of the substantially trapezoidal shape of the lower portion are convex outward. Further, the light-emitting device may not include the translucent member, and the covering member may directly cover the light-emitting element.

In addition, the light emitting device includes a colorant in the covering member, thereby obtaining a first light emitting device that emits blue light, a second light emitting device that emits green light, and a third light emitting device that emits red light. However, the light-emitting device may be a light-emitting device that emits various colors by a combination of the light-emitting element and the wavelength conversion member.

The light Emitting device can be used as a light Emitting diode, such as a shell led (light Emitting diode).

[ reference example ]

(reference example 1)

Fig. 5A is a front view of the light-emitting device of reference example 1. Fig. 5B is a rear view of the light-emitting device of reference example 1. Fig. 5C is a plan view of the light-emitting device of reference example 1. Fig. 5D is a bottom view of the light-emitting device of reference example 1. Fig. 5E is a right side view of the light-emitting device of reference example 1. Fig. 5F is a left side view of the light-emitting device of reference example 1. Fig. 5G is a sectional view of VG-VG of fig. 5C. Fig. 5H is a reference sectional view showing a transparent portion. In the reference cross-sectional view showing the transparent portion, the portion coated with light gray is a transparent body. In addition, discontinuous horizontal thin lines shown in the front view, the rear view, the right view and the left view are all used for determining the shape of the solid surface. In addition, discontinuous thin circular arcs shown in the top view and the bottom view are used for determining the shape of the solid surface.

The light-emitting device 101A includes a base 10, a light-emitting element 20 mounted on the base 10, and a covering member 400A that directly or indirectly covers a part of the base 10 and the light-emitting element 20. Further, a translucent member 30 covering the light emitting element 20 may be provided.

The cover member 400A has a lower portion 410A, an upper portion 430A, and an intermediate portion 420A defined between the lower portion 410A and the upper portion 430A, and the light-emitting element 20 is disposed on the upper portion 430A.

In a plan view, the lower portion 410A is substantially circular, the upper portion 430A is substantially elliptical, and the substantially elliptical major diameter of the upper portion 430A is formed smaller than the substantially circular diameter of the lower portion 410A.

The light-emitting device 100 is followed, among other things.

(reference example 2)

Fig. 6A is a front view of the light-emitting device of reference example 2. Fig. 6B is a rear view of the light-emitting device of reference example 2. Fig. 6C is a plan view of the light-emitting device of reference example 2. Fig. 6D is a bottom view of the light-emitting device of reference example 2. Fig. 6E is a right side view of the light-emitting device of reference example 2. Fig. 6F is a left side view of the light-emitting device of reference example 2. Fig. 6G is a cross-sectional view of the VIG-VIG of fig. 6C. Fig. 6H is a reference sectional view showing a transparent portion. In the reference cross-sectional view showing the transparent portion, the portion coated with light gray is a transparent body. In addition, discontinuous horizontal thin lines shown in the front view, the back view, the right view and the left view are all used for determining the shape of the solid surface. In addition, discontinuous thin circular arcs shown in the top view and the bottom view are used for determining the shape of the solid surface.

The light-emitting device 101B includes a base 10, a light-emitting element 20 mounted on the base 10, and a covering member 400B that directly or indirectly covers a part of the base 10 and the light-emitting element 20. Further, a translucent member 30 covering the light emitting element 20 may be provided.

The cover member 400B has a lower portion 410B, an upper portion 430B, and an intermediate portion 420B defined between the lower portion 410B and the upper portion 430B, and the light-emitting element 20 is disposed on the upper portion 430B.

The lower portion 410B is substantially elliptical, the upper portion 430B is substantially elliptical, and the major axis of the substantially elliptical shape of the upper portion 430B is formed smaller than the major axis of the substantially elliptical shape of the lower portion 410B in plan view.

The light-emitting device 100 is followed, among other things.

Industrial applicability

The light emitting device and the light source device according to the embodiments of the present invention can be suitably used for an outdoor display. The light-emitting device and the light source device according to the embodiments of the present invention can be used for various display devices such as a backlight source of a liquid crystal display, various lighting fixtures, a large-sized display, an advertisement, and a destination guide, and an image reading device and a projector device in a digital video camera, a facsimile machine, a copier, a scanner, and the like.

Claims

1. A light-emitting device is characterized in that,

the light-emitting device includes a base, a light-emitting element mounted on the base, and a covering member that directly or indirectly covers a part of the base and the light-emitting element,

the cover member is continuously formed with a lower portion, an upper portion, and an intermediate portion divided between the lower portion and the upper portion,

the light emitting element is disposed on the upper portion or the intermediate portion,

the lower portion has a substantially oval shape or a substantially oval shape partially broken out, the upper portion has a substantially circular shape or a substantially round shape partially broken out, and the diameter of the substantially circular shape or the substantially round shape of the upper portion is smaller than the major axis of the substantially oval shape or the substantially oval shape of the lower portion.

2. The lighting device according to claim 1,

the cover member has a substantially trapezoidal middle portion, an upper side of which is shorter than a lower side, in a cross-sectional view taken along a major axis of the lower portion and cut in a direction from the upper portion toward the lower portion.

3. The lighting device according to claim 2,

the left and right sides of the substantially trapezoidal shape of the intermediate portion are straight lines or curved lines that are convex toward the inside.

4. The lighting device according to claim 3,

the curvature radius of the curve is 1.5mm to 2.0 mm.

5. The lighting device according to claim 1 or 2,

the base includes a first lead and a second lead arranged in one direction, the second lead has a cup-shaped portion having a recess, the recess has at least an upward surface and an inner side surface, and the light emitting element is mounted on the upward surface defining the recess.

6. The lighting device according to claim 5,

the major diameter of the substantially elliptical shape or the substantially incomplete elliptical shape of the lower portion is parallel to the one direction.

7. The lighting device according to claim 5,

a translucent member that covers the light emitting element is disposed in the recess, and the covering member covers the light emitting element with the translucent member interposed therebetween.

8. The lighting device according to claim 1 or 2,

the ratio of the diameter of the substantially circular or substantially incomplete circular shape of the upper portion to the major diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is 1, and the major diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is 1.001 or more and less than 1.34, where the diameter of the substantially circular or substantially incomplete circular shape of the upper portion is 1.

9. The lighting device according to claim 1 or 2,

the ratio of the diameter of the substantially circular or substantially incomplete circular shape of the upper portion to the minor diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is 1 or more and 1.1 or less, where the diameter of the substantially circular or substantially incomplete circular shape of the upper portion is 1.

10. The lighting device according to claim 1 or 2,

the major diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is substantially 3.9mm, the minor diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is substantially 3.1mm, and the diameter of the circular or incomplete circular shape of the upper portion is substantially 3 mm.

11. The lighting device according to claim 1 or 2,

the substantially truncated ellipse of the lower portion is a substantially truncated ellipse in which one end in the minor diameter direction of the substantially ellipse is truncated, or a substantially truncated ellipse in which one end in the major diameter direction of the substantially ellipse is truncated, in a plan view.

12. The lighting device according to claim 3 or 4,

13. The lighting device according to claim 3 or 4,

the ratio of the diameter of the substantially circular or substantially incomplete circular shape of the upper portion to the minor diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is such that the minor diameter of the substantially elliptical or substantially incomplete elliptical shape of the lower portion is 1 or more and 1.1 or less, when the diameter of the substantially circular or substantially incomplete circular shape of the upper portion is 1.

14. The lighting device according to claim 1,

the cover member has an upper portion curved in an arc shape in a cross-sectional view taken along a direction from the upper portion toward the lower portion.

15. The lighting device according to claim 14,

16. The lighting device according to claim 15,

17. The lighting device according to claim 16,

the curvature radius of the curve is 1.5mm to 2.0 mm.

18. The lighting device according to claim 14,

19. A light source device is characterized in that a light source unit,

the light source device includes:

a plurality of the light emitting devices of any one of claims 1 to 18; and

a mounting substrate on which the light-emitting device is mounted such that the lower portion of the cover member faces the mounting substrate,

the plurality of light emitting devices are arranged in a plurality of rows such that major axes of the substantially elliptical shape or the substantially incomplete elliptical shape of the lower portion are parallel in a plan view, and three of the light emitting devices crossing adjacent rows of the plurality of rows are placed as a group at a position where a straight line virtually connecting centers of the three light emitting devices of each group forms a triangle.

20. The light source device according to claim 19,

the light source device includes a plurality of the light emitting devices according to claim 19,

the three light emitting devices of each group are a first light emitting device emitting blue light, a second light emitting device emitting green light, and a third light emitting device emitting red light, respectively.