Patent ID: 11921330
Assignee: NEC CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 12:
13. A light transmitting and receiving device comprising:
a light receiving device including:
a first light guide body including at least a first light receiving surface and a first emitting end and being formed in a cylindrical shape with the first light receiving surface as a side, signal light entering from the first light receiving surface being guided to the first emitting end formed on either one of an upper surface and an undersurface;
a second light guide body including at least a second light receiving surface and a second emitting end, being formed in a ring shape with open ends according to a shape of the first emitting end of the first light guide body formed in a cylindrical shape, the second light receiving surface being connected to the first emitting end of the first light guide body, and guiding the signal light entering from the second light receiving surface to the second emitting end; and
a light receiver including a light receiving part connected to the second emitting end of a second light guide body, converting the signal light received by the light receiving part into an electric signal, and outputting the electric signal; and
a light transmitting device being equipped inside a cylinder formed by the first light guide body, receiving the electric signal from the light receiver, and projecting projection light based on the received electric signal.