Patent ID: 9110257
Filing Date: 2015-08-18
Classification: G02B

Abstract:
1. An optical receptacle that optically couples a light emitting element and an optical transmission member together when the optical receptacle is disposed between a photoelectric conversion device and the optical transmission member, the photoelectric conversion device including the light emitting element and a light-receiving element that receives monitoring light for monitoring light output from the light emitting element, the optical receptacle comprising: an optical plate that is light transmissive and is so disposed as to face the photoelectric conversion device; an optical block which is light transmissive and disposed on a side opposite to the photoelectric conversion device with respect to the optical plate; and a filler which is light transmissive and provided between the optical block and the optical plate, wherein: the optical plate includes: a plate exterior surface on which light from the light emitting element is incident and from which the monitoring light is output toward the light-receiving element, a plate internal surface disposed in parallel to the plate exterior surface on a side opposite to the photoelectric conversion device with respect to the plate exterior surface, the plate internal surface being a surface through which light of the light emitting element incident on the plate exterior surface and the monitoring light to be output from the plate exterior surface pass through, and an optical plate fitting-part disposed on the plate internal surface, the optical plate fitting-part being configured to fit the optical plate and the optical block together, the optical block includes: a plate-facing surface disposed at a position near the plate internal surface, the plate-facing surface being so disposed as to face the plate internal surface, an incidence surface disposed on the plate-facing surface, the incidence surface being a surface on which light of the light emitting element that passed through the plate internal surface is incident, a reflecting surface disposed on a side opposite to the incidence surface at a tilted angle relative to the incidence surface, the reflecting surface being configured to receive light of the light emitting element incident on the incidence surface, and to reflect the light of the light emitting element thus received toward the optical transmission member, a recess provided at a position on the optical transmission member side on the plate-facing surface in such a manner as to be recessed and to open to the plate internal surface side, the recess being a recess through which light of the light emitting element reflected by the reflecting surface passes, a reflection-and-transmission layer that is formed as an internal surface of the recess on the optical transmission member side, and is disposed on an internal tilted surface of the recess, the internal tilted surface having a predetermined tilted angle relative to the incidence surface, the reflection-and-transmission layer being configured to receive light of the light emitting element that passed through the recess, and to reflect at a predetermined reflectance the light of the light emitting element thus received toward the plate internal surface as the monitoring light while transmitting the light of the light emitting element to the optical transmission member side at a predetermined transmittance as coupling light to be coupled to the optical transmission member, an emission surface that receives the coupled light transmitted through the reflection-and-transmission layer, and outputs the coupled light thus received toward the optical transmission member, and an optical block-fitting part disposed at a position corresponding to the optical plate fitting-part on the plate-facing surface, the optical block-fitting part being configured to be fitted with the optical plate fitting-part, and the filler is provided at least in the recess, and between the recess and the plate internal surface.