Patent ID: 6965552

Claim:
A method of mounting an optical device comprising the steps of: preparing a substrate in which at least a first electrode and a second electrode are disposed and an optical device in which a third electrode and a fourth electrode are disposed corresponding to the first electrode and the second electrode respectively, in which surfaces for mounting the third electrode and the fourth electrode of the optical device have a first height (ah 1 ) and a second height (ah 2 ) from one surface of the optical device on the side opposite to the surface for mounting the third electrode and the fourth electrode, respectively, where ah 1 >ah 2 , each of the first electrode and the second electrode has at least a solder-underlying region and solder on the solder-underlying region, and the solder-underlying region area of the first electrode is aS 1 , the solder-underlying region area of the second electrode is aS 2 , the third electrode area is aS 3 , the fourth electrode area is aS 4 , the volume of a solder disposed on the solder-underlying region of the first electrode is v 1 , and the volume of a solder disposed on the solder-underlying region of the second electrode is v 2 , v 1 ≠v 2 , and each of the values of ah 1 , v 1 , aS 1 , ah 2 , v 2 and aS 2 is set so that the height of the first electrode and the second electrode from the surface of the solder-underlying region to the one surface of the optical device is a height in proportion to (ah 1 +v 1 /aS 1 ) or (ah 2 +v 2 /aS 2 ) after the solder has been melted; and positioning the substrate and the optical device so that the third electrode of the optical device is disposed on the first electrode of the substrate and the fourth electrode of the optical device is disposed on the second electrode of the substrate, melting the solder and soldering the optical device to the substrate.