SU1301657A2 - Apparatus for working polygonal mirrors - Google Patents

Abstract

The invention relates to abrasive processing in the optical industry and can be used in the processing of polygonal mirrors used for horizontal scanning of a laser recording device. The aim of the invention is to improve processing performance and accuracy of angular parameters. The device contains a base 1, on which nd and fixed intermediate ring (PC) 3 with supports. On the latter there is a base element 6 with a hole for placing a face of a mirror. The PC has a vertical guide, on which a slider 4 with centers 5 is arranged to move along it, designed to interact with the base element 6 and located in a plane parallel to the axis of the mirror, with the possibility of adjusting the position of their axis in this plane by means of a compression mechanism 11. The device has axial bearings, one of which has a base element 6, and the other support 7 has a slider 4, while the axial bearings are located in a plane perpendicular to the axis of the centers 5 and the passage Through the axis of symmetry of the hole of the base element 6. 3 Il. sl from O5 ate to U3.J

Description

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The invention relates to abrasive machining in the optical industry and can be used to process polygonal mirrors, for example, 24- and 25-sided prisms made from metals. and is an improvement to the device auth. St. No. 952541.

The aim of the invention is to improve the processing performance and accuracy of the angular parameters of the mirror.

FIG. 1 shows a device for the optical processing of polygonal mirrors, front view; in fig. 2 - the same, top view; in fig. 3 is a view A of FIG. 2

The device consists of a base 1 on which a blank of a polygonal mirror 2 and an intermediate ring 3 is attached. On the vertical guide ring of the "dovetail" type there is a slider 4 in which the centers 5 are placed, one of which is fixed fixedly and the other is movable along its axes and fixations in order to eliminate gaps in connection with the base element 6. The center axis is located in a plane parallel to the mirror axis.

The slider is mounted on the guide and on the support 7 installed at the base with which it has tight contact due to the springs 8. The support 9 in contact with the base element 6 is placed with the support 7 in the same plane perpendicular to the axis of the centers and passing through the axis symmetry of the hole 10 of the base element.

The device works as follows;

A polygonal mirror blank with milled (or ground on a precision machine) diamond edge cutter mounted on a high-precision mandrel with base journals to control the parameters is mounted on the exact prism of the base and fixed with pressure plates. Rotate the supports 7 and 9 to expose the base element to the level of the face plane. Then, the expanding device 11 in the slider forces the axis formed by the centers to coincide with the plane of the base element with the generatrix of the face passing along the axis of the polygonal mirror, and then rotating only two supports 7 and 9 achieve the final face plane exhibition in the plane of the base element.

To increase the rigidity of the base element during processing, its edges are additionally pressed with side supports.

After that, the device is mounted on the spindle of the 2PD-200 polishing and finishing machine, a lap is installed on the top and optical processing is carried out until the required parameters of the face are achieved due to flatness, roughness, and optical purity. Then release the springs that provide the contact base

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element 6 with support 9, turn it on the axis of the centers and rotate the blank of the polygonal mirror with the next facet, ensuring that the attachment forces are identical in the base prism of the base. The base element is lowered onto the support 9 and the rotation of the supports 9 and 7 expose the plane of the base element in the plane of the face. The expanding element of the slide is no longer involved in the setting.

Thus, the pyramidal angle of all faces is automatically provided the same, due to the invariance of the position of the plane of the base element relative to the swing axis of the polygonal mirror.

The achieved accuracy of the pyramid angle of the faces will depend in this case on the accuracy of the base necks of the mandrel on which the polygonal mirror is attached and on the straightness of the guide, which is used to raise the base element to compensate for the wear of its plane. The straightness of the guide finishing can be performed in the range of 0.001 mm, and the movements are in the order of 0.2-0.3 mm when processing all faces of the polygonal mirror, therefore the base bias from the movement can be a fraction of a second. In addition, the accuracy of the geometric shape of the planes of the faces is affected by the stiffness of the supports and the size of the gaps in the joints. To check the rigidity of the device, and most importantly, the unchanged position of the plane of the base element relative to the plane of the face, the base element is equipped with axis indicators with d.c. 0,001 mm.

The stiffness check is carried out directly during the polishing process. For this, a grinding wheel with diamond paste is placed on a rotating device with a polygonal mirror and readings of indicators are taken during the processing cycle.

The allowable deformation of the base element should not exceed 0.001 mm, which provides a deviation from the flatness of the faces within 0.5 N 0.2 (with a deviation from the flatness on the base element N 1).

Claims (1)

Invention Formula A device for processing polygonal mirrors according to ed. St. No. 952541, characterized in that, in order to improve the processing performance and accuracy of the angle parameters of the mirror, a vertical guide is made in the intermediate ring, and the device is equipped with a center mounted slider on one of the axial supports to interact with base element and located in a plane parallel to the axis the mandrel of the mirror with the possibility of adjusting the position of their axis in this plane, the axial bearings being placed in a plane perpendicular to the center axis and passing through the axis, symmetry of the hole of the base element.  6 J 7 -I of FIG. one at FIG. 2 Compiled by A. Kozlov Editor A.VorovichTechred I. VreresCorrector A.T sko Order 929/17 Circulation 716 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 1 13035, Moekva, Zh-35, Raushsk Emb. 4/5 Production and Printing Enterprise, Uzhgorod, ul. Design. four