Light emitting device
DCFirst Claim
1. A light emitting device comprising:
- a substrate;
a plurality of LED chips positioned around a center of a primary surface of the substrate;
a resin frame formed on the primary surface of said substrate and provided annularly so as to surround a mounting area in which said plurality of LED chips are provided;
an anode-side electrode land and a cathode-side electrode land which are electrodes to be connected to an external voltage supply of said light emitting device, the anode-side electrode land and the cathode-side electrode land being provided on the primary surface of the substrate and outside said resin frame; and
an electrode wiring pattern formed on the primary surface of said substrate including (i) a first anode pattern and (ii) a first cathode pattern, the first anode pattern and the first cathode pattern electrically connecting the plurality of LED chips to the anode-side electrode land and the cathode-side electrode land,the plurality of LED chips including a first chip, a second chip, a third chip, and a fourth chip,the first chip, the second chip, the third chip, and the fourth chip being electrically connected in series so as to constitute each of at least one series circuit,the light emitting device further comprising;
a first wire connecting an anode electrode of the first chip and the first anode pattern directly to each other;
a second wire connecting a cathode electrode of the first chip and an anode electrode of the second chip directly to each other;
a third wire connecting a cathode electrode of the third chip and an anode electrode of the fourth chip directly to each other; and
a fourth wire connecting a cathode electrode of the fourth chip and the first cathode pattern directly to each other,the first wire having a length larger than that of the second wire,the fourth wire having a length larger than that of the third wire.
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Abstract
A light emitting device includes: a ceramic substrate; a plurality of LED chips; a printed resistor(s) connected in parallel with the plurality of LED chips; a dam resin made of a resin having a low optical transmittance; a fluorescent-material-containing resin layer; and an anode-side electrode and a cathode-side electrode, (a) which are provided on a primary surface of the ceramic substrate so as to face each other along a first direction on the primary surface and (b) which are disposed below at least one of the dam resin and the fluorescent-material-containing resin layer. With the configuration in which a plurality of LEDs, which are connected in a series-parallel connection, are provided on a substrate, it is possible to provide a light emitting device which can achieve restraining of luminance unevenness and an improvement in luminous efficiency.
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Citations
15 Claims
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1. A light emitting device comprising:
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a substrate; a plurality of LED chips positioned around a center of a primary surface of the substrate; a resin frame formed on the primary surface of said substrate and provided annularly so as to surround a mounting area in which said plurality of LED chips are provided; an anode-side electrode land and a cathode-side electrode land which are electrodes to be connected to an external voltage supply of said light emitting device, the anode-side electrode land and the cathode-side electrode land being provided on the primary surface of the substrate and outside said resin frame; and an electrode wiring pattern formed on the primary surface of said substrate including (i) a first anode pattern and (ii) a first cathode pattern, the first anode pattern and the first cathode pattern electrically connecting the plurality of LED chips to the anode-side electrode land and the cathode-side electrode land, the plurality of LED chips including a first chip, a second chip, a third chip, and a fourth chip, the first chip, the second chip, the third chip, and the fourth chip being electrically connected in series so as to constitute each of at least one series circuit, the light emitting device further comprising; a first wire connecting an anode electrode of the first chip and the first anode pattern directly to each other; a second wire connecting a cathode electrode of the first chip and an anode electrode of the second chip directly to each other; a third wire connecting a cathode electrode of the third chip and an anode electrode of the fourth chip directly to each other; and a fourth wire connecting a cathode electrode of the fourth chip and the first cathode pattern directly to each other, the first wire having a length larger than that of the second wire, the fourth wire having a length larger than that of the third wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification