| 摘要 |
PURPOSE:To obtain fine resolution with a short optical path by arranging a convex lens so that the conjugated surface of the convex lens with a convex lens on an object side or image side of a lens array variable power image projecting optical system satisfies the projecting condition of an unmagnified erect real image of the lens array. CONSTITUTION:The light flux f1 projected from an object O5, transmitted into the lens array 11 and projected in parallel with the optical axis is refracted by a convex lens 12 and advanced to the 2nd focus F2 of the convex lens 12. Light flus f2 advanced as if said flux f2 were projected from the 1st focus F1 of the convex lens 12 after projected from the lens array 11 is refracted by the convex lens 11 and then advanced in parallel with the optical axis. The erect real image of the object O5 is formed on the intersected point of the light flux f1 and f2. When the object O5, the lens array 11, the convex lens 12 and a projecting surface I5 are arranged so that an image side I5' coincides with an image side position satisfying the projecting conditions of the unmagnified erect real image of the lens array 11, a contracted erect real image can be formed while satisfying the projecting conditions of the equal power erect real image of the lens array 11. |
