| 摘要 |
PURPOSE:To obtain a projecting system which is short in conjugate length, is bright and is free from uneven quantity of light by providing masks which regulate off-axial luminous fulxes only on the respective object face side and imaging face side of two sets of lens systems of 2-element constitution symmetrical with respect to an intermediate image. CONSTITUTION:The 1st lens systemIconstituted of 2 peices of lensesI-1,I-2 forms the image of a certain region on an object plane O invertedly on an intermediate image plane M, and the 2nd lens system II constituted of two pieces of lenses II-1, II-2 forms the erecting unmagnified image thereof on an imaging plane C. Thus, the bright projecting lens having good performance is obtained. The upper ray U and lower lay L emitted from the point P on the plane O are regulated by masks M1 and M2. Thus, the projecting system which is short in conjugate distance and is small in uneven quantity of light is obtained. |
