Optical tube for an optoelectronic device, and optoelectronic devices comprising it

An optoelectronic device, comprising:

• a transducer having an optical axis;
• an optical tube assembly, including:
• an optical tube comprising an optical chamber, the optical chamber including a chamber wall;
• a first aperture in the chamber wall proximal with respect to the transducer;
• and
• a second aperture in the chamber wall distal with respect to the transducer, the first and second apertures being at least substantially coaxial along the optical axis, and separated by a first distance (D1) along the optical axis;
• wherein at least one first half-section taken along optical axis or along a direction parallel to optical axis:
• at least an intermediate portion of the chamber wall, extending between (i) a first line orthogonal to optical axis and more distal than or including a boundary point of the first aperture and (ii) a second line orthogonal to optical axis and more proximal than a boundary point of the second aperture, follows a non-straight curve, wherein a local tangent to an intermediate portion at each point (P) is oriented so that stray light rays incoming from the boundary point of the first aperture in the opposite half-section would be so deviated at that point (P) as to impinge upon the chamber wall, an impingement point (Q) of the stray light ray being in the first half-section and more distal than the second line.