| 摘要 |
1,233,575. Reflecting objectives. PERKIN-ELMER CORP. Sept. 3, 1968 [Aug. 31, 1967], No.41887/68. Heading G2J. A catadioptric system, particularly for use as a photographic objective, comprises a refractive component 13 consisting of one or more elements 14, 15 of the same refractive index, having a centrally located aperture extending inwardly from the rear, the convex end R 4 of the support component forming a primary concave mirror 11, and a refractive element 17 whose front end is silvered to form a secondary convex mirror 12, the components 13, 17 being in optical contact, a first lens component 16 being placed in front of component 13 and one or more lens components being placed in the axial aperture. All mirror and lens surfaces are spherical except for the embodiment shown wherein the front surface R 1 of lens component 16 is hyperbolic. Optical data are provided for the example shown in Fig. 1 wherein component 16 is a singlet and three elements 18, 21, 22 are provided in the aperture, elements 21, 22 being in a slidable focusing mount 23, and for two examples wherein the component 16 is formed from two elements the component 19 being formed as a singlet and two singlets respectively. |
