Abstract
A manufacturing error in the orientation of the working planes of a reflecting prism, such as an angle error or an edge error, will cause the optical axis to deviate and the image to lean. So does an adjustment (position error) of a reflecting prism. A universal method to be used to calculate the optical axis deviation and the image lean caused by the manufacturing error of a reflecting prism is presented. It is suited to all types of reflecting prisms. A means to offset the position error against the manufacturing error of a reflecting prism and the changes of image ori- entation is discussed. For the calculation to be feasible, a surface named the ''separating surface'' is introduced just in front of the real exit face of a real prism. It is the image of the entrance face formed by all reflecting surfaces of the real prism. It can be used to separate the image orienta- tion change caused by the error of the prism's reflecting surfaces from the image orientation change caused by the error of the prism's refract- ing surface. Based on ray tracing, a set of simple and explicit formulas of the optical axis deviation and the image lean for a general optical wedge is derived. © 1997 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(97)00912-4)
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