TWO-PARTITE OPTICAL COMPONENTS WITH AIR SPACE

摘要

A multiple lens combination with an air space in which at least three similar spacer bodies of the type which are commercially available in large quantities with relatively small tolerances, such as steel balls, are held in abutment against an internal bore of the lens mounting by a cage ring whereby the quotient of the permissive tolerance of the air space between the mutually facing lens surfaces and the diameter tolerance of the internal bore is at least approximately equal to the tangent of the wedge angle of the air space at its edge.