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Optical mirror surface passive support mechanism based on four-bar mechanism principle

A support mechanism and optical mirror technology, applied in metal processing, etc., can solve problems such as complex process and inapplicable thin mirror support, and achieve the effect of improving force and stress conditions, clear principle and simple structure

Inactive Publication Date: 2008-04-30
NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these supporting mechanisms and measures are relatively complicated in technology, and are not suitable for the support of thin mirrors whose posture and surface shape need to change.

Method used

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  • Optical mirror surface passive support mechanism based on four-bar mechanism principle
  • Optical mirror surface passive support mechanism based on four-bar mechanism principle
  • Optical mirror surface passive support mechanism based on four-bar mechanism principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, see image 3 , Figure 4 and Figure 11 : on a certain optimal support circle on the back of the supported mirror surface 12, three support points are respectively set in the plane along the tangential direction every 120 degrees, and the structure of each support point is, two two-force rods 2, two The first rod is arranged symmetrically with respect to the normal line at the support point, and the axis intersects in the plane of the lateral force of the gravity of the mirror blank along the mirror surface. The other ends of the two two-force rods 2 are connected to the fixed support 11 to form an isosceles trapezoid ; The fixed support 11 is fixed on the frame 5 . The internal force and lateral force of the member form a moment-free three-force converging force system. Seen from the principle of mechanical structure, each group of supports is a four-bar mechanism in the form of an isosceles ladder formed by two two-force rods, the mirror blank and the fr...

Embodiment 2

[0021] Embodiment 2 is basically the same as Embodiment 1, but for the special case that the mirror surface does not rotate around its own axial axis, such as Figure 5 , Figure 6 : Add a four-bar support mechanism radially at C, and change the support at C into a lever and counterweight mechanism. In this way, the three points A, B, and C all play the role of lateral support, and adjusting the lever weight at C can distribute the support reaction force at C and A, B, which is beneficial to improve the force and stress of the mirror surface. Moreover, in this special case, the three points A, B, and C do not have to be arranged in an equilateral triangle, but can be arranged in an isosceles triangle according to the convenience of structural arrangement and the requirements of the best supporting position.

[0022] exist Figure 7 , Figure 11 Among them, three places are selected on the back side of the supported mirror base 12 (such as Figure 5 Three points A, B, C are...

Embodiment 3

[0023] Embodiment 3 is basically the same as Embodiment 1, but the support of at least one support point is a movable support, and a lever is provided between the movable support and the frame. The structure is: the movable support is connected with the lever, and the lever The fulcrum of the lever is fixed on the frame, and the other end of the lever is provided with a counterweight.

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PUM

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Abstract

The present invention relates to an optical mirror passive supporting mechanism based on four bar linkage mechanism principle. It is characterized by that it has three supporting points, said three supporting points are uniformly distributed and spaced at 120deg. Said invention also provides the concrete structure of every supporting point, including two force lever members, supporting seat, machine frame and balance weight, etc. Said invention also provides its working principle and concrete application range.

Description

technical field [0001] The invention relates to a support device for an optical mirror, in particular to a passive support mechanism for an optical mirror based on the principle of a four-bar mechanism, which is used for precise support of an optical mirror whose posture and surface shape need to be changed. Background technique [0002] In the processing of optical mirrors, traditional small optical mirrors widely use shrapnel-type three-point support mechanisms, which are generally as figure 1 , figure 2 In the design shown, the three shrapnels A, B and C are spaced 120 degrees apart. The shrapnel has good in-plane rigidity and good out-of-plane flexibility, realizes axial support and lateral support at the same time, and can release the stress and deformation effects caused by the thermal expansion and contraction of the mirror blank and the frame. However, the disadvantage of this mechanism is that the supporting reaction force N is not in the center of gravity plane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q7/00
Inventor 杨德华姜方华
Owner NANJING INST OF ASTRONOMICAL OPTICS & TECH NAT ASTRONOMICAL OBSE