Structure Design And Bonding Technology Of Mirror Components In Video Camera

With the continuous development and innovation of space technology, spatial resolution of space camera becomes more and more high. Mirror components as one of the important components of space camera, the surface form precision of the mirror will directly affect the image quality of the optical system. Currently, in the design of high-precision space camera’s mirror components, more and more engineers widely adopted bonded way to replace the traditional mechanical fastening. Mirror components generally consists by bonding the mirror and mirror support structure. Bonding stress, thermal stress caused by temperature change, the force of gravity were the main factors affecting the surface form precision. The negative effects caused by these factors can be sloved by designing the support structure and bonding technology rationally. The work of this paper is to slove these problem.In this paper, the design of mirror components, whose caliber was ?320mm, was finished. It included the mirror design, the mirror support structure design and bonding technology. For different bonding technology, the finite element method and experimental verification were used to analyse the surface form precision of the mirror and the structure stiffness of the mirror components. From the analysis and experiment results, more appropriate design option can be achieved. In this paper, the work carried out mainly in the following several areas:1. According to surveying and analyzing the mirror support structure and bonding technology reported at home and abroad, the general procedures and methods of mid-small-diameter mirror’s design, large-diameter mirror’s design, bonding technology’s design were summed up;2. Refering to the existing method of mirror design and the general procedures of mid-diameter mirror’s design, the mirror and the mirror support structure were designed and improcement.3. By theoretical analysis, specific bonding parameters of six bonds and round bonds were achieved. Then, the finite element analysis and experimental verification for two bonding options was carried out to analysis static stiffness and optical properties. The results indicated that the six bonds option is better for bonding the mirror whose caliber is near ?320mm.4. The bonding reliability of the selected mirror components were analyzed. On one hand, Miles method was used to slove the peak stress of random response under the acceptable random vibration condition and the critical random vibration condition. On the other hand, random vibration experiments under the acceptable and critical condition were conducted. Experiments’ data and analysis results show that the mirror components can bear the acceptable random vibration and meet the requirements.