Patent ID: 8328436

Claim:
An optical module comprising: a receptacle receiving an optical connector attached to a distal end of an optical fiber; and a lens body having a contact surface coming into contact with the distal end of the optical fiber when the optical connector is received by the receptacle, wherein: the lens body has the contact surface and an opposing surface opposing the contact surface, the lens body further having a columnar base held by the receptacle, a lens portion and a flat portion, the lens portion and the flat portion being formed on the opposing surface integrally with the base, and the lens portion is completely surrounded by the flat portion and off-centered with respect to the base, wherein when a diameter or a minimum distance between opposing sides passing a center of the columnar base is represented by Φ1, a diameter of the lens portion is represented by Φ2, an offset amount between the central axis of the columnar base and the central axis of the lens portion is represented by Doff, a length of the columnar base is represented by z′, and a radius of a beam having traveled through the lens body for a distance z′ is represented by W(z′), the lens body is designed to satisfy Φ1/2>Φ2/2+Doff and W(z′)<Φ2/2− Doff.