Patent ID: 7121744

Claim:
An optical link device to which a pair of optical fibers through which an optical signal is transmitted are connected to carry out data transmission and reception, characterized by comprising: a light emitting element to which an electrical signal is inputted and which converts the electrical signal into an optical signal so as to output to one of the optical fibers; a light receiving element to which an optical signal is inputted from the other of the optical fibers and which converts the optical signal into an electrical signal so as to output it; an element mounting unit on which the light emitting element and the light receiving element are mounted; and a lens body having a transmission side lens unit for guiding the optical signal outputted from the light emitting element to the one optical fiber and a reception side lens unit for guiding the optical signal outputted from the other optical fiber to the light receiving element, in which the transmission side lens unit and the reception side lens unit are integrally formed, and characterized in that: a light shielding unit formed integrally within and encased by the lens body, which is made of a material different from the transmission side lens unit and the reception side lens unit is provided between the transmission side lens unit and the reception side lens unit thereof.