US 8,283,681 B2Granted

Lighting device and method of manufacturing the same

AssigneesSanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.

InventorsNoriaki Sakamoto, Naoki Tanahashi, Tsuyoshi Hasegawa, Takaya Kusabe, Masahiko Mizutani, Hideki Mizuhara, Yoshinari Sakuma

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Abstract

A lighting device including a metal substrate to prevent temperature rise of LED chip is offered. The lighting device includes the metal substrate, an anode or cathode electrode of the LED chip disposed on the metal substrate, brazing materials connecting the LED chip and the metal substrate, and a groove formed in the anode or cathode electrode. Forming the groove can prevent an occurrence of a crack in the brazing materials. Also, a lighting device includes the metal substrate, an anode and cathode electrode of the LED chip disposed on the metal substrate and brazing materials connecting the LED chip and the metal substrate. Further, a slit is formed in the metal substrate between the anode and cathode electrode. Forming the slit in the metal substrate can prevent an occurrence of a crack in the brazing materials.

Claims9

Dependent claims

A lighting device comprising:

a metal substrate comprising aluminum;
a plurality of LED packages mounted on a top surface of the metal substrate, each package comprising a ceramic substrate, a LED chip mounted on a front surface of the ceramic substrate, an anode electrode, a cathode electrode and a heat release electrode, and the anode, cathode and heat release electrodes being disposed on a back surface of the ceramic substrate, a resin insulation film disposed on the top surface of the metal substrate so as to be between the LED packages and the top surface;
and
a first electrode, a second electrode and a third electrode which are disposed on the insulation film, wherein the first, second and third electrodes are bonded to the anode, cathode and heat release electrodes, respectively;
wherein a shallow groove is formed in the first electrode or the second electrode;
and
wherein the shallow groove extends from the inside toward the outside of the first electrode, or from the inside toward the outside of the second electrode in a plane view.

4 more elements

Dependencies are inferred from the claim text.