Light-emitting device and method of manufacturing light-emitting device
A light-emitting device includes a base structure, a light-emitting element, an optical member, and first and second adhesive parts. The first adhesive parts are disposed in first and second regions of a second surface of the base structure. The second adhesive parts are located at both opposite sides of the first adhesive part without being in contact with the first adhesive part. In the top view, a virtual first line segment, which connects two points respectively on the first adhesive parts in the first and second regions, extends across a first surface of the base structure. A virtual line segment, which connects two points respectively on the second adhesive parts at the both opposite sides of the first adhesive part, does not extend across the first surface. A width of the first adhesive part along the line segment is greater than a width of the second adhesive part.
1 . A light-emitting device comprising:
a base structure having a first surface, and a second surface positioned higher than the first surface, the second surface having a rectangular frame shape surrounding the first surface in a top view, the second surface including a first region and a second region;
one or more light-emitting elements arranged on the first surface;
an optical member bonded to the base structure so as to at least partially overlap the first surface in the top view;
a plurality of first adhesive parts formed by curing a first adhesive agent, the first adhesive parts being disposed respectively in the first region and the second region of the second surface at positions between the second surface and the optical member and fixing the optical member to the base structure, the first adhesive parts not being disposed at corners of the rectangular frame shape of the second surface; and
a plurality of second adhesive parts formed by curing a second adhesive agent different from the first adhesive agent, the second adhesive parts being disposed such that a pair of the second adhesive parts are respectively located at both opposite sides of a corresponding one of the first adhesive parts in the first region on the second surface without being in contact with the corresponding one of the first adhesive parts and another pair of the second adhesive parts are respectively located at both opposite sides of a corresponding one of the first adhesive parts in the second region on the second surface without being in contact with the corresponding one of the first adhesive parts, the second adhesive parts not being disposed at the corners of the rectangular frame shape of the second surface, wherein
in the top view, a virtual first line segment, which connects two points respectively on the first adhesive parts in the first region and the second region, extends across the first surface,
in the top view, a virtual second line segment, which connects two points respectively on the pair of the second adhesive parts at the both opposite sides of the corresponding one of the first adhesive parts in the first region, does not extend across the first surface,
in the top view, a virtual third line segment, which connects two points respectively on the another pair of the second adhesive parts at the both opposite sides of the corresponding one of the first adhesive parts in the second region, does not extend across the first surface,
in the top view, a width of the corresponding one of the first adhesive parts in the first region in a direction parallel to the second line segment is greater than a width of each of the pair of the second adhesive parts at the both opposite sides of the corresponding one of the first adhesive parts in the first region in the direction parallel to the virtual second line segment, and
in the top view, a width of the corresponding one of the first adhesive parts in the second region in a direction parallel to the third line segment is greater than a width of each of the another pair of the second adhesive parts at the both opposite sides of the corresponding one of the first adhesive parts in the second region in the direction parallel to the virtual third line segment.
2 . The light-emitting device according to claim 1 , wherein
in the top view,
the first region is a part of a region of the second surface defining a first side of the rectangular frame-shape, and a second region is a part of a region of the second surface defining a second side of the rectangular frame-shape opposite to the first side.
3 . The light-emitting device according to claim 2 , wherein
the rectangular frame-shape has a pair of long sides and a pair of short sides, and
the first side and the second side are the long sides of the rectangular frame-shape.
4 . The light-emitting device according to claim 2 , wherein
in the top view, a virtual line, which extends through a middle point of the first side and is perpendicular to the first side, extends across the corresponding one of the first adhesive parts in the first region and the corresponding one of the first adhesive parts in the second region.
5 . The light-emitting device according to claim 2 , wherein
the one or more light-emitting elements include a plurality of light-emitting elements that are arranged in a matrix form of 3 or more rows and 2 or more columns, each row extending in a row direction perpendicular to the first side, each column extending in a column direction parallel to the first side,
in the top view, at least one of the first adhesive parts is located between a virtual straight line, which passes through the light-emitting elements arranged in one outermost row among the rows of the light-emitting elements, and a virtual straight line, which passes through the light-emitting elements arranged in the other outermost row among of rows of the light-emitting elements,
in the top view, one of the pair of the second adhesive parts at the both opposite sides of the at least one of the first adhesive parts is located between a virtual straight line, which passes through the light-emitting elements arranged in a row adjacent to the one outermost row, and a virtual straight line, which passes through and extends along a third side of the rectangular frame-shape, and
in the top view, the other of the pair of the second adhesive parts at the both opposite sides of the at least one of the first adhesive parts is located between a virtual straight line, which passes through the light-emitting elements arranged in a row adjacent to the other outermost row, and a virtual straight line, which passes through and extends along a fourth side of the rectangular frame-shape.
6 . The light-emitting device according to claim 5 , wherein
in the top view, one of the first adhesive parts and a corresponding pair of the second adhesive parts are located only in an adhesive region of the second surface between a virtual line, which, of inner edges of the second surface having the rectangular frame-shape, extends along one of the inner edges corresponding to the third side and is perpendicular to the first side, and the virtual line, which extends along one of the inner edges corresponding to the fourth side and is perpendicular to the first side, and
the first adhesive parts and the second adhesive parts are not located in regions other than the adhesive region of the second surface.
7 . The light-emitting device according to claim 6 , wherein
in the top view, the optical member has outer edges defining an octagonal shape, with one side of the octagonal shape positioned on the first side, and one side of the octagonal shape positioned on the second side,
the pair of the second adhesive parts at the both opposite sides of the corresponding one of the first adhesive parts in the first region are located at both ends of the one side of the octagonal shape positioned on the first side, and
the another pair of the second adhesive parts at the both opposite sides of the corresponding one of the first adhesive parts in the second region are located at both ends of the one side of the octagonal shape positioned on the second side.
8 . The light-emitting device according to claim 1 , wherein
the first adhesive agent is an ultraviolet curing resin adhesive agent, and
the second adhesive agent is a thermosetting resin adhesive agent.
9 . The light-emitting device according to claim 1 , wherein
the base structure includes
a base portion having the first surface,
a lateral portion connected to the base portion and surrounding the first surface in the top view, and
a cover having the second surface and connected to the lateral portion.
10 . The light-emitting device according to claim 9 , wherein
the cover includes
a frame member formed of a metal as a main material, the frame member being bonded to the lateral portion, and
a light-transmissive member bonded to the frame member.