Light emitting device and manufacturing method thereof
A light-emitting device and a manufacturing method thereof are provided, which device yields light exhibiting an actual hue with a deviation reduced as much as possible from a designed hue value, the light being a mixture of light emitted from a plurality of light-emitting elements mounted densely and excited light from a phosphor contained in a resin sealing the light-emitting elements. The light-emitting device includes a board, a plurality of light-emitting elements mounted densely on the board, a first resin free from any phosphor, placed among the plurality of light-emitting elements, and a second resin containing a phosphor and covering an exposed part of the plurality of light-emitting elements.
1. A light-emitting device comprising:
a board;
a plurality of light-emitting elements mounted on a mount region of the board so that a space between adjacent light-emitting elements is 5 μm or more and 50 μm or less;
a rectangular resin frame formed from a white resin around the mount region, wherein the board comprises a flat region surrounding the rectangular resin frame;
a first resin free from any phosphor, injected into the space among the plurality of light-emitting elements and made to invade the space among the plurality of light-emitting elements with the aid of the capillary phenomenon so that the space among the plurality of light-emitting elements is filled with the first resin;
a second resin containing a phosphor and covering an exposed part of the plurality of light-emitting elements; and
a lens, the incident edge of which is of a circular shape of 10 mm or less in diameter, configured to condense light emitted from the plurality of light-emitting elements, the lens comprising a lower concave recessed from a bottom surface of the lens, the lens being mounted on the board with the bottom of the lens in contact with the flat region, and the second resin being placed within the lower concave, wherein there is a gap between the lens and the second resin in the lower concave.
2. A manufacturing method of a light-emitting device, comprising the steps of:
mounting a plurality of light-emitting elements on a mount region of a board so that a space between adjacent light-emitting elements is 5 μm or more and 50 μm or less;
forming a rectangular resin frame from a white resin around the mount region;
injecting a first resin free from any phosphor into the space among the plurality of light-emitting elements and making the first resin to invade the space among the plurality of light-emitting elements with the aid of the capillary phenomenon so that the space among the plurality of light-emitting elements is filled with the first resin;
covering, with a second resin containing a phosphor, an exposed part of the plurality of light-emitting elements; and
mounting a lens, the incident edge of which is of a circular shape of 10 mm or less in diameter, on the board, the lens having a lower concave recessed from a bottom surface of the lens, wherein mounting the lens includes placing the second resin in the lower concave and mounting the bottom of the lens in contact with a flat region of the board surrounding the resin frame, wherein the lens is configured to condense light emitted from the plurality of light-emitting elements, wherein there is a gap between the lens and the second resin in the lower concave.
3. The manufacturing method according to claim 2 , wherein
the first resin is a resin for adhering the plurality of light-emitting elements to the board in the step of mounting, and
in the step of injecting, the first resin is spilled out into a space among the plurality of light-emitting elements, to fill the space among the light-emitting elements with the first resin.
4. The manufacturing method according to claim 2 , wherein in the step of injecting, the first resin is injected laterally into a space among the plurality of light-emitting elements mounted on the board, to fill the space among the plurality of light-emitting elements with the first resin.