noun
plan; blueprint; design drawing
Refers to a detailed technical drawing used in architecture, engineering, or manufacturing. Often implies a scaled, precise document.
建築家が新しい家の設計図を描いた。
The architect drew up the blueprint for the new house.
この機械の設計図はどこにありますか。
Where is the design drawing for this machine?
青写真 literally means 'blueprint' and can be used metaphorically for a future plan, whereas 設計図 is a concrete technical drawing.
Compound of 設計 (design) and 図 (drawing, diagram).