Method for producing an optical assembly and method for designing lens for assembly

A method for producing an optical assembly in which N (where N is an integer of two or more) lenses from a first lens to an N-th lens and a lens-holding member are assembled, the method comprising:

• a first assembling step of assembling lenses from the first lens to an (n−1)-th lens (where n is an integer of 1<n≦N) among the N lenses to the lens-holding member to assemble a pre-assembly;
• an optical property-measuring step of measuring an optical property of a first optical system including n−1 lenses in the pre-assembly or measuring an optical property of a second optical system formed by temporarily assembling a temporary assembling lens equivalent to the n-th lens based on the design value of a predetermined optical parameter to the pre-assembly;
• an optical parameter correction value-calculating step of obtaining a displacement amount from a design value of the optical property of the first optical system based on a measurement result of the optical property, and changing the optical parameter of at least the n-th lens itself from a design value thereof, thereby calculating a correction value of the optical parameter of the n-th lens that corrects the displacement amount;
• a lens-producing step of producing the n-th lens based on the correction value;
• and
• a second assembling step of assembling the n-th lens produced in the lens-producing step to the pre-assembly,
• wherein the optical assembly is produced by performing the first assembling step, the optical property-measuring step, the optical parameter correction value-calculating step, the lens-producing step, and the second assembling step in this order on at least one n-th lens.