SU756337A1 - Method of manufacturing optical corner reflectors - Google Patents

Description

The invention relates to optomechanical industry, in particular to the production of optical corner reflectors.

Known methods of manufacturing optical corner reflectors, consisting in the mechanical processing of the billet of optical glass in the form of a regular triangular pyramid, or in separate processing and with the subsequent connection of three mirrors in the form of reflective faces tripleprism [1] and [2].

Known methods for producing corner reflectors, which consists in processing a billet of optical glass in the form of a cube, followed by cutting out the correct pyramids from it. This method is more technologically advanced both in terms of processing, and control £ 3 ^.

The disadvantage of these methods are significant complexity and a small percentage of the output of reflectors of increased accuracy, as well as the impossibility of active operational impact on the production process.

The purpose of the invention is to improve the manufacturing accuracy of corner reflectors.

2

This goal is achieved by the fact that after machining the reflector, the deviation φ of the working angle of the reflecting face from

5 direct and spatial position of the plane formed by the incident and reflected beam in each of the six sectors of the projection of the reflecting faces into the refracting face when the reflector is fixed, wedge-shaped plate is processed

(p-1), where p is the refractive index of the material, six three carbon plates are cut out from a plane-parallel plate;

the six triangles of the projection of the reflected faces into the refracting face, while orienting the plane of the main section of the plate in the two opposite sectors of the sweep at angles οί and -o, respectively, relative to the plane formed by the other and the incident beam, where = = agssos · ·, from the direction of deviation opposite to the measured one, each of the triangular wedges is mechanically fixed in the plane of the light, reflector opening.

The drawing shows the plane

30 main section of wedges in relation 3

756337

four

control triple, and

also the mutual orientation of errors. .

The manufacture of corner reflectors, for example, from optical glass in the form of a regular three-sided pyramid, or in the form of three rigidly interconnected orthogonal mirrors, for example, on a metal base is as follows.

The magnitude of the deflection and the spatial position of the plane of deflection of the reflected beam (angle φ) with respect to the incident in each of the six sectors of the sweep of the faces of the pyramid are measured. The measurement of the angle manufacturing error can be made, for example, by means of a photoelectric autocollimator containing a linearly polarized radiation source, by means of diaphragming four non-measuring sectors of the triple prism and installing it into one of the measured sectors of the dichroic polarizer and phase plate. The accuracy of the measurement error in this case is determined by the accuracy of the photoelectric autocollimator. This device also makes it possible to measure the spatial position of the plane formed by the reflected incident beam in each of the six sectors of the sweep of the sides of the pyramid. A plate is machined with a wedge shape, providing a deflection of a normally incident beam by an angle ψ greater than half the maximum deflection of the reflected beam in the pyramid. The deflection angle of the resulting plate can be measured by the same autocollimator. Six triangular plates along the contour corresponding to six triangles of the pyramid faces are cut out from the plate, orienting the plane of the main section of the plate in opposite sectors of the scan at angles cc and-o relative to the plane formed by the reflected and incident beam from

direction opposite to that measured in the prism. Mechanically fix each of the triangular wedges in the plane of the light hole of the prism, for example, by means of optical glue.

The proposed method allows not only to obtain an increased percentage of the yield of suitable reflectors for a given accuracy of their manufacture within the control accuracy (almost 100%) *, but also to ensure the accuracy of the manufacture of the reflector corresponding to the instrumental error of the measuring device, in this case the photoelectric autocollimator. Considering the fact that existing photoelectric autocollimators provide measurement accuracy on the order of hundredths of an angular second, it is possible to provide a simple technological process for obtaining triple prisms that are unique in their accuracy characteristics.

Claims (1)

Claim. A method of manufacturing optical corner reflectors consisting in mechanically treating three rigidly connected mutually orthogonal reflecting planes in the form of a regular trihedral pyramid, characterized in that, in order to improve the precision in the manufacture of reflectors, the deflection φ of the working angle of the reflecting face from the direct and spatial position is measured the plane formed by the reflected and incident beam in each of the six sectors of the projection of the reflecting faces into the refracting face at a fixed orientation pyramids, process transparent plate with a wedge shape (p-1), where. η - indicator the refractions of the wedge material cut six triangular plates from the plate, corresponding to the triangles of the projection, reflecting faces into the refracting face, orienting the plane of the main section of the plate in two opposite triangles of the projection of reflecting faces to the refracting face at angles about = = zygoz ~~ and (- about), respectively, relative to the plane formed by the reflected and incident beam from the direction of deviation opposite to that measured in the pyramid and mechanically fix each of the triangular wedges in the plane of the light hole of the pyramid. .