CN1327252C - Light weight large-bore compound reflector - Google Patents

Abstract

The invention discloses a lightweight large-diameter composite mirror, which comprises: graphite fiber/epoxy resin or graphite fiber/cyanate panel+honeycomb interlayer+graphite fiber/epoxy resin or graphite fiber/cyanide panel arranged in sequence A composite mirror blank composed of acid resin panels; it is characterized in that: a micromirror glass cylinder array and a micromirror glass reflective base layer fixed by epoxy resin are sequentially placed on the mirror base, and a vacuum mirror is placed on the micromirror glass reflective base layer. Coated metal reflective layer. The advantages of the present invention are: adopting the microcrystalline cylindrical array as the transition between the carbon fiber composite material mirror blank and the microcrystalline reflective base layer reduces the problem of thermal expansion coefficient mismatch between the composite material mirror blank and the microcrystalline reflective base layer, and reduces the size of the mirror surface. The effect of thermal deformation. In addition, since the glass-ceramic reflective base layer has a good optical surface, the thermal stability and chemical stability of the reflector are guaranteed.

Description

Lightweight Large Aperture Compound Mirror

technical field

The invention relates to an optical reflector, in particular to a light-weight and large-diameter multi-point supporting compound reflector for a space camera.

Background technique

In space science, astronomical research, earth information and its environmental information, high-resolution and high-sensitivity space cameras are playing an increasingly important role. The ultra-lightweight large-aperture mirror is a key component of a high-resolution, high-sensitivity space camera. For large-aperture mirrors, under the premise of ensuring the optical performance of the mirror, the quality of the mirror directly determines the feasibility, reliability and economy of the mirror. In recent years, a carbon fiber composite material with light weight, high strength, high rigidity, and low thermal expansion coefficient has been widely used as a mirror blank for large-aperture mirrors. The advantage of using this material as a mirror blank is to achieve the light weight of the mirror. However, due to the phenomenon of fiber printing on the surface of carbon fiber materials, it cannot be directly polished. At present, glass layers or metal reflective layers are generally formed on composite material panels by bonding or evaporation, but this method is quite difficult to prepare. , especially when bonding, due to the large area of the mirror, it is easy to cause uneven thickness of the adhesive layer, bubbles, etc. lead to instability of the mirror surface.

Contents of the invention

The object of the present invention is to provide a lightweight large-diameter composite mirror that can achieve both light weight and stable mirror surface.

The composite mirror of the present invention comprises: a composite mirror blank made of sequentially stacked first panels, honeycomb interlayers, and second panels, wherein the first panel and the second panel are made of graphite fiber, epoxy resin or graphite fiber, cyanide It is composed of acid resin; on the mirror blank, there are micromirror glass cylinder arrays and micromirror glass reflective substrates fixed by epoxy resin in sequence; on the micromirror glass reflective substrate, there are metal reflectors through vacuum coating. layer.

The advantages of the present invention are:

1. Arrange the microcrystalline cylindrical array on the carbon fiber composite material mirror blank as a supporting point and then bond the microcrystalline reflective base layer, avoiding the optical processing and direct bonding of the optical reflective base layer adhesive layer on the surface of the carbon fiber composite material due to the phenomenon of fiber printing. Difficulty with uneven thickness.

2. The use of microcrystalline cylindrical arrays as the excessive connection between the carbon fiber composite mirror blank and the microcrystalline reflective base reduces the problem of the thermal expansion coefficient mismatch between the composite mirror blank and the microcrystalline reflective base, and reduces the influence of thermal deformation of the mirror surface .

3. The composite material as the mirror blank ensures the rigidity and strength of the reflector, and also reduces the self-weight of the reflector.

4. Since the glass-ceramic reflective substrate has a good optical surface, the thermal stability and chemical stability of the reflector are maintained.

Description of drawings

Figure 1 is a schematic structural diagram of a lightweight large-aperture composite mirror.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of composite reflector of the present invention is described in detail:

The composite reflector of the present invention includes: a composite mirror blank made of successively stacked first panels 101, honeycomb interlayers 102, and second panels 103, wherein the first panel and the second panel are made of graphite fiber, epoxy resin or graphite Composed of fiber and cyanate ester; on the mirror blank, there are micromirror glass column arrays 2 fixed by epoxy resin and micromirror glass reflective substrates 3; Coated metal reflective layer 4.

The graphite fiber/epoxy resin or graphite fiber/cyanate panel is composed of multiple layers of graphite fiber cloth impregnated in epoxy resin or cyanate, and epoxy resin is sandwiched in the middle of the radial direction of the cloth at 45 degrees. The resin layers are cross-laid. Said honeycomb interlayer is a paper honeycomb interlayer.

The size of said micro-mirror glass cylinder array and micro-mirror glass reflective substrate is based on the diameter of the reflector in combination with the commonly used finite element analysis, to obtain the support point size, arrangement and micro-mirror glass reflection that meet the minimum amount of mirror deformation. The thickness of the base layer. This embodiment provides a set of optimal data: for a reflector with a diameter of 1m, the thickness of the micromirror glass cylinder is 1mm, the diameter is 6mm, and the spacing is 30mm, arranged in a square; the thickness of the glass-ceramic reflective base layer is 3mm.

The preparation process of composite mirror of the present invention is as follows:

Each layer of the mirror blank 1 is laid according to the above-mentioned arrangement and laying method with the assistance of precision jigs, and is solidified and formed in an autoclave at one time.

Then glue the glass-ceramic cylinder array 2 with epoxy glue and fix it on the mirror blank according to the above-mentioned design requirements, grind the glass-ceramic cylinder support surface after it solidifies, and stick the glass-ceramic reflective surface base layer on it. Then, optically grind the cured glass-ceramic reflective base layer, and vacuum-deposit a metal reflective layer on it, and a lightweight large-diameter composite reflective mirror is prepared.

Claims (1)

1. A lightweight large-diameter composite mirror, comprising: a composite mirror blank (1) composed of a first panel (101), a honeycomb interlayer (102), and a second panel (103) arranged in sequence, wherein the first Panel (101) and second panel (103) are made of graphite fiber, epoxy resin or graphite fiber, cyanate; It is characterized in that: On the mirror blank (1), there are successively a micromirror glass cylinder array (2) and a micromirror glass reflective base (3) fixed by epoxy resin, and the micromirror glass cylinder array (2) is used as a micromirror glass cylinder array (2). The support of the mirror glass reflective base (3); on the micro mirror glass reflective base (3), there is a metal reflective layer (4) through vacuum coating.