| 摘要 |
PCT No. PCT/DE88/00726 Sec. 371 Date Jul. 18, 1989 Sec. 102(e) Date Jul. 18, 1989 PCT Filed Nov. 17, 1988 PCT Pub. No. WO89/04980 PCT Pub. Date Jun. 1, 1989.A main mirror for a reflecting telescope comprises plurality of individual polygonal reflecting elements (1 to 11) and positioning and adjusting elements (12) connected thereto. Prior art main mirrors of this type have a poor capacity for transmitting ponint images and for modulation and are unsuitable for use in the infrared region, because the positioning and adjustment elements, in particular the measurement sensors arranged in the region of the separating lignes between the individual polygonal reflecting elements (1 to 11) emit interfering thermal radiation. Furthermore, the polygonal reflecting elements (1 to 11) of prior art main mirrors (20) are expensive to manufacture. In order to remedy these drawbacks, the reflecting surface forms a complete circle by means of connecting reflecting elements (1 to 8) connected radially to the outer edges of the polygonal reflecting elements (9), the reflecting elements (1 to 11) are made from a lightweight preformed material, and the positioning and adjustment elements (12) are arranged below the reflecting elements (1 to 11).
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