A method of manufacturing a primary mirrors for reflector telescope

 

(57) Abstract:

Usage: for making telescope mirrors. The essence of the invention: each mirror element is made, connecting the top plate, the frame of honeycomb structure and the base, and each cover plate shape corresponding to its location on the spherical surface of the primary mirror, and the final grinding and polishing carried out separately for each mirror element, or by setting them in the collection. 1 C.p. f-crystals, 2 Il.

The invention relates to methods of making telescope mirrors.

There is a method of fabrication of the primary mirror reflector telescope whose primary mirror is formed from 35 hexagonal mirror elements placed in the form of honeycombs on the mirror surface, and in the center of the left notch on one mirror element for monitoring cassegrainian focus. Manufacture of individual hexagonal mirror elements is very difficult. They are remote from the axis sections of the paraboloid, which should be hexagonal in plan view [1] In the manufacture of charge around the workpiece, giving it the desired shape by the application on the Orme. After removing this effort get the mirror element of a given shape, representing (if efforts have been selected correctly) section of the paraboloid. Experience shows, however, that when cutting hexagon having curvature.

There is a method of fabrication of the primary mirror reflector telescope whose elements made in the form of round disks [2] and for producing the final shape of the mirror surface carry out the final grinding and polishing.

The purpose of the invention is to provide a method of fabrication of the primary mirror, which would allow to provide a simple and inexpensive manufacture as a separate mirror elements and the primary mirror as a whole.

The purpose is due to the fact that in the method of manufacturing a primary mirrors for reflector telescope, consisting of mirror elements, which are mounting and adjusting elements, wherein for producing the final shape of the mirror surface carry out the final grinding and polishing, are made separately for each mirror element cover plate, frame made of material of low mass with cellular structures of the form corresponding to the location of the surface of the cover plate on the aspherical surface of the primary mirror, connecting the top plate with the corresponding frames from a material of a small mass with a honeycomb structure and base plates in the mirror elements, and the final grinding and polishing carried out separately for each mirror element, or by setting them in the collection, and then collect from the mirror elements of the primary mirror, forming the surface of a round shape with a round center hole.

The final grinding and polishing can be done processing device, controlled from the computer in polar coordinates.

In Fig.1 primary mirror with a Central hole, a top view; Fig. 2 hexagonal element primary mirror of Fig.1, a perspective view.

The primary mirror 1 mirror telescope, is shown in Fig.1, consists of a large number of individual polygonal mirror elements. The outer edge of the primary mirror 1 is formed of a polygonal mirror elements 2-7 various forms, the outer edges of which have a radius of curvature of the primary mirror 1. Inside, joining them other mirror elements 8, 9,Islom hexagonal mirror elements 10. To the center of the mirror 1 is formed a round hole 11, there are several polygonal elements 12, 13 of different shape, the inner edge which has a radius of curvature of the Central hole 11. The primary mirror is preferably parabolic in shape, but may have a different form. Due to the large overall diameter or a large total aperture of the primary mirror of its individual elements, adjacent to the Central mirror elements that are off-axis sections of the primary mirror, grind and Polish individually or in the collection.

In Fig. 2 shows a hexagonal element 10 of the primary mirror 1 containing the cover plate 14, the frame 15 of a material of a small mass with a honeycomb structure, for example of quartz or ceramic, and the base plate 16. For making an individual mirror element cover plate 14 attached in a special molding device defined geometric form, and then through the frame 15 is connected to the support plate 16, for example, by welding. In conclusion, spend grinding and polishing of the surfaces of the mirror element to the end of the form. This grinding can be a single or group several mirror elements having the s mainly hexagonal or polygonal shape with arc edge, grinded and polished to provide a grinding and polishing tool degree of freedom, leading to the specified form off-axis plot generated primary mirror. This can occur with the participation of computers in management by means of polar coordinates, and ground and polished directly away from the axis of the mirror elements adjacent to each other almost without gaps. On the lower sides of the mirror elements include elements supports and alignment, which include tilt sensors. Thus, each mirror element can be adjusted individually in the direction of the overall focus. This is done under control of a computer to strict tolerances. Optically ineffective dividing line does not create thereby preventing thermal radiation and do not have any impact on image quality.

1. A method of MANUFACTURING a PRIMARY MIRRORS FOR reflector TELESCOPE consisting of N mirror elements, which are mounting and adjusting elements, wherein for producing the final shape of the mirror surface carry out the final grinding and polishing, characterized in that izgotavlival structure and the base plate, give the surface of each cover plate using formatado tool shape corresponding to the location of the top surface of this plate on the aspherical surface of the primary mirror, connecting the top plate with the corresponding frames with a honeycomb structure and base plates in the mirror elements, and the final grinding and polishing carried out separately for each mirror element, or by setting them in the collection, and then collect from the mirror elements of the primary mirror, forming the surface of a round shape with a round center hole.

2. The method according to p. 1, characterized in that the final grinding and polishing carry out processing device, controlled from the computer in polar coordinates.

 

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