Low obscuration spider for supporting optical element

Details Low obscuration spider for supporting optical element Low obscuration spider for supporting optical element

1977-09-02

1979-01-16

Henry, Jon W.

350 27, G02B 1706, G02B 2306

Patent

active

041346386

ABSTRACT:
In a reflecting telescope, a diagonal mirror is supported by a spider comprising four thin flexible metal vanes secured to a mirror carrier by axially slotted pins which are rotatable for adjusting vane tension. These vanes provide an extremely stable mirror support, which exhibits low obscuration and minimizes the effect of diffraction spikes.

REFERENCES:
patent: 2513723 (1950-07-01), Greenwood et al.
patent: 2948189 (1960-08-01), Fischer
patent: 3064526 (1962-11-01), Lindsay
Sky and Telescope, Oct. 1969, Sky Publishing Corp., Cambridge, Mass. pp. 262-263.
Ingalls, Albert G., Ed., Amateur Telescope Making-Advanced Book Two, Scientific Amer., Inc., 1972, pp. 620-622.
Sidgwick; J. B., Amateur Astronomers Handbook, Faber & Faber, London, 1955, pp. 41-42.
Advertisement, Sky and Telescope, Nov. 1977, for "Research Quality Spiders and Secondary Holders", Kenneth F. Novak & Co.

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