Abstract: An optical system and a method of manufacturing an optical system are provided. The optical system includes a carrier, a light emitter, a light receiver, a block structure and an encapsulant. The light emitter is disposed on the carrier. The light receiver is disposed on the carrier and physically spaced apart from the light emitter. The light receiver has a light detecting area. The block structure is disposed on the carrier. The encapsulant is disposed on the carrier and covers the light emitter, the light receiver and the block structure. The encapsulant has a recess over the block structure.

Abstract: A focus has an opening and an upper surface surrounding the opening. The opening is configured to accommodate a SiC wafer. The SiC wafer has a first surface and a second surface opposite to the first surface. When the focus ring is mounted in a semiconductor wafer processing apparatus and the SiC wafer is positioned in the opening of the focus ring, the upper surface of the focus ring is lower than the first surface of the SiC wafer and is higher than the second surface of the SiC wafer.

Abstract: The present invention provides a metal working device for cold working fillets which includes an upper block journally supporting a primary roller and a secondary roller. The primary roller has a rounded outer contact surface and the secondary roller has a concave mating surface. A portion of the concave mating surface is rollingly engaged with a portion of the outer contact surface along a predetermined contact area. The predetermined contact area is greater than 90 degrees. A support area is also provided which rollingly supports the object to allow the metal working device to cold work the fillets. Lastly, a pressure supplying device supplies pressure to the upper block to provide the required pressure to cold work the fillets.