| 摘要 |
A high resolving power Gaussian lens used for a facsimile or the like which uses high-density solid image forming elements. To achieve this object, it is necessary to maintain a high resolving power to cover the marginal portion of the image plane. In the Gaussian lens comprising four groups of lenses and being symmetrical to a diaphragm, each lens group comprises a cemented lens composed of a positive meniscus lens with a concave surface directed toward the diaphragm and a negative meniscus lens. The positive lens has a refractive index in excess of 1.74 to flatten an image surface. The second lens group and the third lens group are reduced in thickness to make it possible to have a wider angle.
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