Patent ID: 11921331
Assignee: ENPLAS CORPORATION
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 5:
6. An optical receptacle configured to be disposed between a light emitting element and an optical transmission member and configured to optically couple the light emitting element and the optical transmission member, the optical receptacle comprising:
a first optical surface configured to allow an incidence of light emitted from the light emitting element;
a second optical surface configured to emit, toward the optical transmission member, light emitted from the light emitting element and advanced inside the optical receptacle;
a diffraction surface disposed on the first optical surface, on the second optical surface, or on a light path between the first optical surface and the second optical surface,
wherein the diffraction surface is configured such that a main component of diffraction light generated by the diffraction surface is a primary diffraction light, and configured to focus only the primary diffraction light toward an end portion of the optical transmission member, and
wherein in the diffraction surface, a blaze number, blaze angle, and shape of an installation surface are appropriately set in accordance with an attenuation rate and focusing position of the primary diffraction light.