Light emitting module, method for manufacturing light emitting module, and vehicular lamp
Provided is a light emitting module in which an LED device is mounted and power is supplied to the LED device by a gold wire. The light emitting module includes a first resin (sealing material) that seals the gold wire and a second resin (dam wall) that surrounds at least a portion of the outer peripheral of the first resin. The first resin has a lower viscosity and a lower elastic modulus compared to the second resin, and protects the gold wire mechanically and chemically. The second resin suppresses the first resin from being flowed out toward the peripherals, and, as a result, the sealing state of the gold wire by the first resin may be maintained.
1. A light emitting module comprising:
a base, on which is provided a radiant heat substrate and a power supplying land, the radiant heat substrate and the power supplying land being physically separated from each other;
an electrode land is provided on the radiant heat substrate, with a light emitting device being mounted on the electrode land;
a metal wire with a first end and a second end, the first end being connected to the power supplying land and the second end being connected to the electrode land, the metal wire being configured to supply power from the power supplying land to the light emitting device via the electrode land;
a first resin configured to seal the metal wire in its entirety; and
a second resin configured to surround at least a portion of an outer peripheral of the first resin, thereby forming a dam wall for the first resin and enabling the first resin to maintain its shape for the metal wire,
wherein neither the first resin nor the second resin directly contacts the light emitting device, and
the first resin has a viscosity of about 80 Pas and a height of a highest point of the second resin is made to be lower than a height of a highest point of the metal wire.
2. The light emitting module of claim 1 , wherein the first resin has a lower viscosity before curing and a lower elastic modulus after curing compared to the second resin.
3. A vehicular lamp comprising a light source configured by the light emitting module of claim 1 .
4. A vehicular lamp comprising a light source configured by the light emitting module of claim 2 .
5. The light emitting module of claim 1 , wherein the dam wall is formed as a cut-less type.
6. The light emitting module of claim 1 , wherein the first resin is formed in a height not higher than a light emitting surface of the light emitting device.
7. The light emitting module of claim 1 , wherein the first resin is a silicon gel.
8. The light emitting module of claim 1 , wherein the second resin is an epoxy.
9. The light emitting module of claim 1 , wherein an elastic modulus of the first resin ranges from 0.01 MPa to 2 MPa.
10. The light emitting module of claim 1 , wherein an elastic modulus of the second resin ranges from 10 GPa to 12 GPa, and a viscosity of the second resin ranges from 100 Pas to 200 Pas.
11. The light emitting module of claim 1 , wherein the dam wall is formed as a long circle type.
12. The light emitting module of claim 1 , further comprising a sub mount provided between the light emitting device and the electrode land,
wherein the configuration of the metal wire to supply power from the power supplying land to the light emitting device via the electrode land further comprises supplying power through the sub mount.