PROBLEM TO BE SOLVED: To accurately adjust photoelectric constituting elements having a light transmission unit and a connection unit by allowing the first member of the connection unit to slide on a reference face to the light transmission unit, fixing the first member to the light transmission unit, and allowing the second member of the connection unit to slide to the first member. SOLUTION: A first member 22 is allowed to slide on a reference face so as to be adjusted, and a light flux radiated at the time of this adjustment is abutted to a deflection mirror 26, and the deflected light flux is transmitted, and the deflected light flux is substantially butted to the center of the edge face of an optical waveguide body 21 in a direction extended in parallel with the reference face. Then, a relative position between the first member 22 and a light transmission unit 1 is fixed at the adjusted position. Then, a second member 23 is allowed to slide to the first member 22 so as to be adjusted, and a prescribed condition is fulfilled for the position of the edge face of the optical waveguide body 21 related with the position of the optical image screen of an optimal system, Then, a relative position between the first and second members 22 and 23 is fixed at the adjusted position.
展开▼