| 摘要 |
PCT No. PCT/EP95/04903 Sec. 371 Date Jul. 10, 1998 Sec. 102(e) Date Jul. 10, 1998 PCT Filed Dec. 12, 1995 PCT Pub. No. WO97/22020 PCT Pub. Date Jun. 19, 1997A lens structure without spherical aberration, formed by a first (S) and second (S') curved surface of transparent material facing one towards the other, wherein the first surface (S) has a configuration chosen between a first and second sub-configuration, the first sub-configuration being obtained by applying the sine of the limit refraction angle (i') of the transparent material, the derived value being the focus location of the first configuration on a horizontal axis (XX'), and the second sub-configuration being obtained by applying the sine of the limit refraction angle (i') of the transparent material, the derived value being the focus location of the first configuration on a horizontal axis (XX'), and the second sub-configuration being obtained by applying the sine of the limit refraction angle (I') of the transparent material for vertex (v) positioning of the second configuration on the horizontal axis (XX'). If a particular lens focus (F) is desired, the second curved surface (S') can be built according to a formula which optically correlates the second one (f'') of the second surface focuses (f'; f'') with the desired lens focus (F), the first one (f') of said second surface focuses (f'; f'') being always in coincidence with one focus (f) of the first curved surface (S). It is also disclosed a stereoscopic camera including such a lens structure.
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