| 摘要 |
There is provided an optical module capable of preventing the efficiency of optical coupling from deteriorating even if temperature varies. The optical module 1 has a holder 2 and an aspherical lens 11 , which are formed of a plastic so as to be integrated with each other. The holder 2 has a cylindrical portion 8 which engages a photoelectric transfer element package 3 . The photoelectric transfer element package 3 has a flange portion 15 which butts the open end face 16 of the cylindrical portion 8 . The flange portion 15 is bonded to the open end face 16 of the cylindrical portion 16 , and a gap is formed between the outer peripheral surface 18 of the cap 12 of the photoelectric transfer element package 3 and the inner peripheral surface of the cylindrical portion 8 . In the optical module 1 , the variation (Deltad2) of the distance (d2) from the vertex P 1 of the aspherical lens 11 to the focal point P 2 thereof in accordance with temperature change is substantially equal to the variation (DeltaL) of the axial length (L) from the vertex P 1 of the aspherical lens 11 to the open end face 16 of the cylindrical portion 8 in accordance with temperature change.
|
