(A) ;NOVEL AROMATIC COMPOUND, ITS PRODUCTION AND DRUG FOR HEART BLOOD VESSEL CONTAINING THE SAME

摘要

A diaphragm blade for cameras comprising an opaque blade portion and a filter portion. This diaphragm blade is made by forming a blade portion by depositing a light intercepting substance on a sheet made of a filter material and then cutting the blade portion as including the filter portion off the sheet so that a high quality diaphragm blade having an integral filter may be obtained at a low cost.