Mounting substrate and light-emitting device using the same
View Patent ↗To provide a mounting substrate wherein insulation resistance of a metal substrate having an oxide film formed on the surface thereof is ensured, and light reflectance is improved by preventing a light-reflecting material contained in a reflection layer from diffusing into a surface of the metal substrate. A mounting substrate includes a metal substrate ( 21 ), and a surface layer section ( 22 ) formed on an upper surface of the metal substrate ( 21 ). The surface layer section ( 22 ) includes an oxide film layer ( 23 ) formed on a surface of the metal substrate ( 21 ), a barrier layer ( 24 ) formed on the oxide film layer ( 23 ), a reflection layer ( 25 ) formed on the barrier layer ( 24 ) and containing a light-reflecting material, and a protection film layer ( 26 ) formed on the reflection layer ( 25 ).
1. A mounting substrate comprising:
a metal substrate formed of an aluminum plate; and
a surface layer section formed on an upper surface of the metal substrate,
wherein the surface layer section includes:
an oxide film layer comprising an alumite layer, the oxide film layer being formed on the upper surface of the metal substrate;
a barrier layer formed on the oxide film layer and containing at least one of titanium, nickel, ruthenium, palladium, tungsten, and platinum;
a reflection layer formed on the barrier layer and containing a light-reflecting material formed of silver; and
an insulating protection film layer formed on the reflection layer, and
wherein the insulating protection film layer is formed of a multilayer film including a light-transmitting resin film, a titanium oxide evaporated film, and a silicon oxide evaporated film.
2. The mounting substrate according to claim 1 , wherein
the barrier layer formed on the oxide film layer has a uniform thickness.
3. The mounting substrate according to claim 1 , wherein
the reflection layer is formed of a resin film made of a light transmitting resin containing silver.
4. The mounting substrate according to claim 3 , wherein
the silver is 90% or more in purity.
5. The mounting substrate according to claim 1 , wherein
the reflection layer is formed of a silver evaporated film.
6. The mounting substrate according to claim 5 , wherein
the silver is 90% or more in purity.
7. The mounting substrate according to claim 1 , further comprising:
a wiring substrate having a wiring pattern, the wiring substrate being formed on end portions of an upper surface of the surface layer section.
8. A light-emitting device comprising:
the mounting substrate claimed in claim 1 ;
at least one light-emitting diode element mounted on a surface of the mounting substrate; and
a light-transmitting resin body that seals the light-emitting diode element.
9. The light-emitting device according to claim 8 , further comprising:
a frame surrounding the light-transmitting resin body.