Patent ID: 9685578
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A photocoupler, comprising: a light emitting element for emitting a light; a light-sensing element for receiving the light; a transparent inner encapsulant body having a dome encapsulant portion and an extension encapsulant portion, wherein the dome encapsulant portion having a dome height is provided to encapsulate the light emitting element and the light-sensing element in the dome encapsulant portion; an outer covering body provided to cover the transparent inner encapsulant body, wherein an optically reflective surface is formed on the outer covering body directly in contact with a dome surface of the dome encapsulant portion; and two conductive frames on which the light emitting element and the light-sensing element are respectively mounted, wherein the two conductive frames are respectively extending out of the outer covering body from the transparent inner encapsulant body, wherein the extension encapsulant portion is extendedly formed from the dome encapsulant portion in a direction from the optically reflective surface radially outward with an extending height being smaller than the dome height, the light emitting element and the light-sensing element are provided as facing the optically reflective surface, a portion of the light emitting from the light emitting element is reflected to a light receiving top portion of the light-sensing element through the optically reflective surface, and the other portion of the light emitting from the light emitting element is directly emitting to a light receiving side portion of the light-sensing element through the dome encapsulant portion along a direction which is parallel to two surfaces of the two conductive frames on which the light emitting element and the light-sensing element are respectively mounted, the light-sensing element is able to sense the light parallel to the two surfaces of the two conductive frames and the light reflected from the optically reflective surface, a surface of the light receiving top portion is parallel to the surfaces of the conductive frames, and a surface of the light receiving side portion is perpendicular to the surfaces of the conductive frames.