Optical device with through-hole cavity

摘要

A light-emitting device having a through-hole cavity is disclosed. The optical device may contain a plurality of conductors, a light source die, a body and a transparent encapsulant material. The body may have a top surface and a bottom surface. A cavity is formed within the body extending from the bottom surface to the top surface and defining therein a bottom opening and a top opening, respectively. Optionally, the light-emitting device may comprise a lens. During manufacturing process, liquid or semi-liquid form transparent material is injected from the bottom surface into the cavity, encapsulating the light source die and forming a lens. The shape of the lens is defined by a mold aligned to the top opening of the body. In yet another embodiment, optical devices having a cavity or multiple cavities are disclosed. The optical devices may include a proximity sensor, an opto-coupler, an encoder and other similar sensors.

主权项

1. An encoder having a code wheel and a package, the package, comprising:
a plurality of conductors; two die attach areas formed separately on two portions of the plurality of conductors; a light source die attached on one of the two die attach areas, the light source die configured to emit light towards the code wheel and being reflected thereof; a light detector die attached to an other of the two die attach areas for receiving light reflected from the code wheel; a body encapsulating a portion of the plurality of conductors, the body having a top surface, a bottom surface and side surfaces through which the plurality of conductors protrudes; a first cavity in the body extending from the bottom surface to the top surface of the body and defining therein an opening at each of the top and bottom surfaces of the body; a transparent encapsulant of first material formed within the cavity encapsulating the light source die and the die attach area, the cavity having a configuration such that the transparent encapsulant of the first material mechanically interlocks with the body after formation of the first material; and an optical lens formed by a portion of the transparent encapsulant of the first material extending from the cavity.