Patent ID: 7453079

Claim:
A surface mount type photo-interrupter comprising: an insulating base provided with an upper surface, a lower surface opposite to the upper surface, and a side surface connecting the upper surface and the lower surface; a light emitting element provided at the upper surface of the insulating base; a light receiving element provided at the upper surface of the insulating base; a first terminal electrode for the light emitting element; a second terminal electrode for the light receiving element; a first primary mold made of transparent synthetic resin and covering the light emitting element; a second primary mold made of transparent synthetic resin and covering the light receiving element; a secondary mold made of opaque synthetic resin and fixing the first primary mold and the second primary mold; wherein each of the first and second terminal electrodes is formed on at least one of the side surface and the lower surface of the insulating base, wherein the secondary mold is provided with a groove which light generated by the light emitting element inverses to reach the light receiving element, the groove being located between the first and the second primary molds, and wherein the secondary mold is provided with a pair of inner surfaces facing the groove, each of the inner surfaces being provided with a transmission hole for light, the first primary mold being provided with a first reflecting surface to direct light from the light emitting element toward the transmission holes, the second primary mold being provided with a second reflecting surface to direct light from the transparent holes toward the light receiving element.