Patent ID: 8652569

Claim:
An optical waveguide production method comprising: forming an under-cladding layer on a surface of a metal substrate; forming a core in a pattern on a surface of the under-cladding layer; forming an alignment mark at a predetermined position on the under-cladding layer, wherein the alignment mark is generally cylindrical, and has a tapered top surface peripheral edge having a taper angle of 30 to 45 degrees and a taper width of 4 to 6 μm; preparing a molding die which includes a cavity having a mold surface complementary in shape to an over-cladding layer and has an alignment mark provided at a predetermined position to be associated with the alignment mark formed on the under-cladding layer; bringing the molding die, with its cavity facing upward, under the metal substrate formed with the core and the under-cladding layer so that the cavity of the molding die is positioned in opposed relation to the under-cladding layer of the metal substrate, and positioning the molding die with respect to the under-cladding layer of the metal substrate with reference to the pair of alignment marks associated with each other by utilizing light emitted at a wavelength of 400 to 700 nm from a molding die side; and forming the over-cladding layer to cover the core; wherein a material for the alignment mark formed at the predetermined position on the under-cladding layer is a photo-curable composition comprising the following components (A) and (B): (A) a polymerizable compound having a (meth)acrylate group; and (B) a photoradical polymerization initiator.