| 摘要 |
PCT No. PCT/FR90/00943 Sec. 371 Date Nov. 1, 1991 Sec. 102(e) Date Nov. 1, 1991 PCT Filed Dec. 24, 1990 PCT Pub. No. WO91/10103 PCT Pub. Date Jul. 11, 1991.A device for focusing parallel rays on a receiving element (20). The device is characterized in that it comprises at least one focusing element on either side of a principal plane, each said element comprising a cylindrical primary reflector the base of which consists of a parabolic curve (AA') and which is offset by a certain distance (d) with respect to the principal plane on the side of the parabolic curve (A,A'), and a secondary reflector consisting of two cylindrical elements (BCD, B'C'D'), the base of which is made up of at least one generalized involute curve (BC, B'C'), each of these curves ending with an upstream end (B,B') determining a straight segment (BB') on which is positioned the focal point (F) of the parabolic curve (AA') forming the base of the primary reflector (24), as well as a downstream end (C,C'), the focal point of each generalized involute curve (BC and B'C') consisting respectively of the end (A',A) of the parabolic curve (AA') which faces its concave portion.
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