公开(公告)号：US5229880A

公开(公告)日：1993-07-20

申请号：US848632

申请日：1992-03-09

申请人： Harvey M. Spencer ,  Lacy G. Cook

发明人： Harvey M. Spencer ,  Lacy G. Cook

IPC分类号： G02B13/02 ,  G02B5/18 ,  G02B13/14 ,  G02B15/02 ,  G02B17/02 ,  G02B17/08 ,  G02B23/00 ,  G02B23/12 ,  G02B27/00

CPC分类号： G02B27/0037 ,  G02B15/02 ,  G02B17/02 ,  G02B23/12 ,  G02B27/4211 ,  G02B27/4277 ,  G02B5/1876 ,  G02B5/1895

摘要： An infrared refractive reimaging afocal telescope (10) has an objective lens group (12), an eyepiece lens group (14), and a switching lens group (16). The system (10) provides a plurality of magnification modes in a compact arrangement. The system (10) utilizes lenses (40, 42, 44, 46) with diffractive surfaces to provide for magnification changes and chromatic aberration correction. The system provides for excellent image quality in all modes using a minimum number of lens elements.

公开(公告)号：US5386312A

公开(公告)日：1995-01-31

申请号：US923759

申请日：1992-08-03

申请人： Harvey M. Spencer

发明人： Harvey M. Spencer

IPC分类号： B41J2/44 ,  B41J2/45 ,  B41J2/455 ,  G02B13/00 ,  G02B13/22 ,  G02B25/00 ,  G02B26/10 ,  G02B26/12 ,  G02B27/30 ,  G02B9/12 ,  G02B11/10

CPC分类号： G02B26/124 ,  G02B13/00 ,  G02B13/22 ,  G02B27/30

摘要： A collimating lens (10) is constructed of a lens assembly having a first lens set (12, 14) at a first end of the assembly and a second lens set (20) at a second end of the assembly with a doublet (16, 18) disposed between the first lens set and the second lens set. The first lens set includes a plurality of lens elements (12, 14) each of which has positive optical power. The second lens set has a single lens element (26) of positive optical power and a concave surface (40) facing subject matter to be viewed by the collimating lens. The doublet lens element includes a lens element (16) constructed of flint glass and having a negative optical power plus a lens element (18) constructed of crown glass and having a positive optical power. In the doublet lens element, the negative power lens element has two concave surfaces, the positive-power lens element has two convex surfaces, and the two lens elements are cemented together to provide for a broad-band chromatic correction. The second end of the optical assembly of the lens is characterized by a telecentric entrance pupil for the viewing of a radiant subject. An external aperture stop (50) is provided in front of the first end of the optical assembly at a distance of at least one focal length from the first lens element of the collimating lens. This provides for more efficient collection of light and a wider field of view.

摘要翻译： 准直透镜（10）由透镜组件构成，透镜组件在组件的第一端具有第一透镜组（12,14），第二透镜组（20）在组件的第二端处具有双峰（16， 18）设置在第一透镜组和第二透镜组之间。 第一透镜组包括多个具有正光焦度的透镜元件（12,14）。 第二透镜组具有正光焦度的单透镜元件（26）和面对主体的凹面（40），以由准直透镜观看。 双透镜元件包括由火石玻璃构成的透镜元件（16），并具有负光焦度以及由冠状玻璃构成并具有正光焦度的透镜元件（18）。 在双透镜元件中，负功率透镜元件具有两个凹面，正光透镜元件具有两个凸面，并且两个透镜元件被胶合在一起以提供宽带彩色校正。 透镜的光学组件的第二端的特征在于用于观察辐射物体的远心入射光瞳。 在距离准直透镜的第一透镜元件至少一个焦距的距离处，在光学组件的第一端的前面设置外部孔径光阑（50）。 这样可以更有效地收集光线和更广泛的视野。