Patent ID: 7643144

Claim:
A method of manufacturing a head unit using an alignment method, which is used when positioning and joining a plurality of workpieces relative to each other, each workpiece having a plurality of alignment marks for alignment, the method of manufacturing a head unit comprising: opposing a mask and an optical axis adjustment mask to each other, wherein the mask, as a transparent member, is provided with reference marks with which optical axis adjusting alignment marks are aligned, and the optical axis adjustment mask has the optical axis adjusting alignment marks formed therein; simultaneously observing a first reference mark at a first location and a first optical axis adjusting alignment mark corresponding positionally to the first reference mark with a first optical unit having a first optical axis pointed in a direction of the first optical axis adjusting alignment mark via the first reference mark from a side of the mask, adjusting a position of the optical axis adjustment mask such that positions of the first reference mark and the first optical axis adjusting alignment mark coincide, and also performing similar positional adjustment for a second reference mark at a second location and a second optical axis adjusting alignment mark corresponding positionally thereto; simultaneously observing the first or second reference mark and the first or second optical axis adjusting alignment mark with a second optical unit having a second optical axis pointed in a direction of the first or second optical axis adjusting alignment mark via the first or second reference mark from the side of the mask, and adjusting the second optical axis such that positions of the first or second reference mark and the first or second optical axis adjusting alignment mark coincide; simultaneously observing different sets of the reference marks and the alignment marks for a workpiece with the first optical unit and the second optical unit, and performing positioning of the workpiece; and fixing the positioned workpiece.