Optical package structure
View Patent ↗An optical package structure is provided. The optical package structure includes a substrate, a frame layer, an optical unit, a bonding layer, a transparent plate and an encapsulation layer. The frame layer formed on the substrate surrounds a cavity where the optical unit is located. The bonding layer covers a portion of an upper edge of the frame layer and exposes the other portion of the upper edge of the frame layer. The transparent plate mounted on the bonding layer extends across the optical unit and extends beyond an outer edge of the bonding layer. The encapsulation layer covers a lateral edge of the transparent plate and the outer edge of the bonding layer.
1. An optical package structure comprising:
a substrate having a first surface and a second surface opposite to the first surface;
a frame layer formed on the first surface of the substrate and surrounding a cavity on the substrate, the frame layer having a first surface and a second surface opposite to each other, wherein the first surface of the frame layer faces toward the cavity and the second surface of the frame layer faces away from the cavity;
an optical unit disposed on the first surface of the substrate and located inside the cavity;
a bonding layer formed on a portion of an upper edge of the frame layer and exposing the other portion of the upper edge of the frame layer;
a transparent plate mounted on the bonding layer and extending across the optical unit, the transparent plate extending beyond an outer edge of the bonding layer, the transparent plate having a first surface and a second surface opposite to the first surface and facing toward the optical unit; and
an encapsulation layer covering a lateral edge of the transparent plate and the outer edge of the bonding layer, the encapsulation layer being in contact with a portion of the second surface of the transparent plate and a portion of the upper edge of the frame layer, an external lateral surface of the encapsulation layer which faces away from the cavity being aligned with the second surface of the frame layer.
2. The optical package structure according to claim 1 , wherein an upper edge of the encapsulation layer extends from an inner edge of the encapsulation layer with a depression angle, and the depression angle ranges from 5° to 60°.
3. The optical package structure according to claim 1 , wherein the optical package structure further comprises:
at least one wire electrically connected to the optical unit; and
at least one pad electrically connected to the at least one wire, the pad being disposed on the first surface of the substrate or the exposed portion of the upper edge of the frame layer.
4. The optical package structure according to claim 1 , wherein a plurality of through holes are provided in the substrate and connecting the first surface and the second surface of the substrate, openings of the through holes on the first surface of the substrate being located under the optical unit, the frame layer or the encapsulation layer.
5. The optical package structure according to claim 4 , wherein a protection film is formed between the openings of the through holes and the optical unit, the frame layer or the encapsulation layer.
6. The optical package structure according to claim 5 , wherein the protection film is solder mask.
7. The optical package structure according to claim 4 , wherein the through holes are filled with conductive material, solder mask or resin.
8. The optical package structure according to claim 1 , wherein the transparent plate has a step-cut edge, and the encapsulation layer covers the step-cut edge of the transparent plate.
9. The optical package structure according to claim 1 , wherein the optical unit is an image sensor chip.
10. The optical package structure according to claim 1 , wherein a plurality of optical microstructures are disposed on a sensing surface of the optical unit.
11. The optical package structure according to claim 1 , wherein the optical unit is disposed on a circuit chip.