Patent ID: 7137745

Claim:
A subassembly comprising: a supporting substrate having a groove at which a member is disposed; a light emitting element mounted at said supporting substrate and operable to emit light with a first wavelength; a lens element including a lens portion formed at a surface of an optical substrate and a projection portion that comes in contact with said groove at said supporting substrate when said lens element is mounted, said lens element being positioned relative to said light emitting element and being operable to convert divergent light emitted from said light emitting element to substantially parallel light, and said projection portion supporting an external edge of said lens portion and being disposed between said groove and the external edge of said lens portion when said lens element is mounted; a wavelength dividing filter mounted at said supporting substrate and operable to divide light into different wavelengths; and a light receiving element at which light with a second wavelength having been divided through said wavelength dividing filter enters.