Lead frame, method of making the same and light receiving/emitting device
AssigneesHitachi Cable Precision Co., Ltd., Mamoru Mita
InventorsTadashi Kawanobe, Yuichi Ohnuma, Mamoru Mita
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Abstract
A lead frame includes a base material, a reflection layer formed on a part of the base material, and a characteristic sustaining layer formed at least on the reflection layer to cover the reflection layer for sustaining a characteristic of the reflection layer by isolating the reflection layer from an outside. The reflection layer includes the characteristic to exhibit a predetermined reflectivity to light with a predetermined wavelength, and the characteristic sustaining layer prevents a decrease in the reflectivity of the reflection layer and transmits light reflected by the reflection layer.
Claims21
A lead frame for mounting a light emitting element, comprising:
- a base material;
- a reflection layer configured to reflect light emitted from the light emitting element, wherein the reflection layer is formed on apart of the base material;
- and
- a characteristic sustaining layer covering an exposed surface of the reflection layer and isolating the reflection layer from an outside environment, wherein the characteristic sustaining layer comprises a part configured to mount the light emitting element thereon;
- wherein:
- the reflection layer comprises Ag, and
- the characteristic sustaining layer comprises an Au thin film.
A method of making a lead frame for mounting a light emitting element, comprising:
- forming a reflection layer comprising Ag configured to reflect light emitted from the light emitting element on a part of a base material;
- and
- forming a characteristic sustaining layer comprising Au covering an exposed surface of the reflection layer and isolating the reflection layer from an outside environment, wherein the characteristic sustaining layer comprises a part configured to mount the light emitting element thereon.
A lead frame for mounting a light emitting element, comprising:
- a base material;
- a barrier layer on the base material;
- an adhesion layer on the barrier layer;
- a reflection layer configured to reflect light emitted from the light emitting element, wherein the reflection layer is formed on a part of the adhesion layer;
- and
- a characteristic sustaining layer covering an exposed surface of the reflection layer and isolating the reflection layer from an outside environment, wherein the characteristic sustaining layer comprises a part configured to mount the light emitting element thereon;
- wherein the base material comprises Cu or a Cu-alloy, the barrier layer comprises Ni, the adhesion layer comprises Pd, the reflection layer comprises Ag, and the characteristic sustaining layer comprises Au.
A lead frame for mounting a light emitting element, comprising:
- a base material;
- a reflection layer configured to reflect light emitted from the light emitting element, wherein the reflection layer is formed on a part of the base material;
- and
- a characteristic sustaining layer covering an exposed surface of the reflection layer and isolating the reflection layer from an outside environment, wherein the characteristic sustaining layer comprises a part configured to mount the light emitting element thereon;
- wherein the characteristic sustaining layer consists essentially of Au.
A lead frame for mounting a light emitting element, comprising:
- a base material;
- a reflection layer configured to reflect light emitted from the light emitting element, wherein the reflection layer is formed on a part of the base material;
- and
- a characteristic sustaining layer covering an exposed surface of the reflection layer and isolating the reflection layer from an outside environment, wherein the characteristic sustaining layer comprises a part configured to mount the light emitting element thereon;
- wherein the characteristic sustaining layer consists of Au.
A lead frame for mounting a light emitting element, comprising:
- a base material;
- a reflection layer configured to reflect light emitted from the light emitting element, wherein the reflection layer is formed on a part of the base material;
- and
- a characteristic sustaining layer covering an exposed surface of the reflection layer and isolating the reflection layer from an outside environment, wherein the characteristic sustaining layer comprises a part configured to mount the light emitting element thereon;
- wherein the characteristic sustaining layer comprises a flash-plated Au layer.
Dependencies are inferred from the claim text.