RU2251130C2 - Method of lens adjustment - Google Patents

Abstract

FIELD: optical instrument engineering.

SUBSTANCE: lens has frame with casing inside which casing a number of lenses are glues, intermediate gaskets-rings are mounted inside air gaps among lenses. Lens also has fixing and adjusting members. Lens optical force adjustment compensator is mounted in front of lenses. Compensator is made in form of flat-parallel plate and placed inside frame. Frame is aligned with lenses in fixing member, which springs-load the lens inside case and can rotate around its axis. Flat-parallel plate is mounted at angle to optical axes of lenses. Before adjustment the lenses are put on glue inside the case; intermediate rings-gaskets have to be also installed. Lenses are fixed with fixing elements and locked. Final adjustment of lens is performed after fixing and locking units of lens by means of additional compensator due to rotation of frame provided with flat-parallel plate around its axis or till optical axes of objective lenses are matched and subsequently locked.

EFFECT: improved precision of quality of stable adjustment.

2 cl, 1 dwg

Description

The invention relates to optical-mechanical devices, in particular, to lenses for generating radiation with low divergence when forming a radiation field, which are capacitors.

Known for the closest in technical essence to the lens that we selected for the prototype, which is an integral part of the device (1).

The lens contains a housing, several lenses in one frame, intermediate rings-gaskets between the air spaces of the lenses, fixing and fixing elements. And the lens alignment is provided by installing the lenses in the frame with fixing them with glue, trimming and installing intermediate spacer rings between the lenses and fixing the lens with fasteners and their locking (1).

The disadvantage of this device is the lens and its method of aligning the alignment of the optical axis of the lenses is the following. In manufacturing practice, when assembling the lens, methods are used to achieve the specified accuracy and quality of adjustment, fitting, interchangeability, selection, adjustment of lenses, which are fixed with glue or paint and locked with nuts in a given position. And with non-uniform application of the adhesive, tension forces may arise during its polymerization due to design and technological tolerances, which lead to displacement of the lenses, which can lead to a misalignment of the alignment of the optical axis of the channel, i.e. the optical characteristics of the lens are reduced with a decrease in quality, especially after the removal of internal stresses by thermal cycling, which leads to possible decentration of the lens.

In this case, the defect cannot be eliminated due to the rigid connections between the objective lenses and the lack of compensation for the mismatch of the optical axis of the lenses.

All this reduces the quality of the lens and, as a result, reduces the effectiveness of its use in the device.

The objective of the invention is to improve the quality of the lens and its effectiveness due to the alignment of the alignment of its elements.

This task is achieved in that the lens containing several lenses mounted coaxially in one frame with the housing, intermediate spacer rings between the air spaces of the lenses, the fixing and fastening elements of the lenses, an additional compensator for aligning the optical axis of the lenses is installed in the frame with the housing in front of the lenses, made in the form of a plane-parallel plate in the frame, with the frame mounted coaxially to the lenses in the fastener, which compresses the lenses in the housing, and has the ability to rotate around its axis, and the plane oparallelnaya plate is mounted in the frame at an angle to the optical axis of the lens.

And in the method of aligning the lens, which includes installing lenses in a frame with a housing, installing intermediate rings-gaskets, fastening lenses with fasteners and locking them in it, the final adjustment of the lens is carried out after fixing and locking the lens elements with an additional compensator due to the rotation of the frame with a plane-parallel plate around of its axis until the optical axes of the lenses of the lens agree with its subsequent locking.

The proposed design of the lens and the method of aligning the optical axis of the lenses with an additional compensator made in the form of a plane-parallel plate and installing it at an angle to the optical axis of the lenses can eliminate the residual decentration of the lenses after thermal cycling, and improve the quality of the lens and its efficiency.

The invention is illustrated in the drawing, which shows a lens containing:

1 - a frame with a housing 2 for assembling and aligning the lenses of the lens;

3 - adhesive sealant, which is applied to the outer diameter of the lenses to fix them in the cavity of the cylindrical frame during Assembly and alignment of the lenses;

4 - lenses, the set of which in the frame is a condenser;

5 - intermediate ring gaskets between the air spaces of the lenses, which ensure the alignment of the lenses when adjusting the lens;

6 - spring to provide efforts to prevent lens displacement during Assembly and alignment of the lens;

7 - fasteners (nut, screws) for locking from rotation of the lens elements;

8 - an additional compensator in the frame 9 for aligning the lens after removing internal stresses after thermal cycling, which is made in the form of a plane-parallel plate mounted at an angle to the axis of the lenses in the frame 9, mounted in the mounting element 7 (nut) of the housing 2 coaxially to the axis of the lenses;

10 - the angle of inclination of the plane-parallel plate in the frame 9 to the optical axis of the lenses;

11 - optical axis of the lenses.

With the help of an additional compensator 8, residual misalignment (mismatch) of the optical axes 11 of the lenses 4 after thermal cycling and removal of internal stresses by tilting the compensator 8 in the frame 9 relative to the axis of the frame 1 with the housing 2 is eliminated.

Adjustment of the lens is as follows.

After adjusting the lens during assembly and fastening with fixing the lens elements, the lens alignment is checked, i.e. their mismatch of the axes, when they mismatch or the residual misalignment of the optical axes 11 of the lenses 4 tilt the additional compensator 8 by rotating it with a frame 9 around the axis 11 of the lens, i.e. screwing or unscrewing the frame 9 into the mounting element 7 is a change in the direction of the optical axis 11 of the lens.

The proposed technical solution allows alignment of the lens with high accuracy, to ensure the alignment stability over time, and thereby improve the quality of the lens.

A high degree of collimation of radiation and design features of the described lens ensure its successful practical use in various signal processing devices.

Sources of information taken into account:

1. M.Ya. Kruger, V.A. Panov, V.V. Kulagin, G.V. Pogarev, Y.M. Kruger, A.M. Levinsan. "Handbook of the designer of optical-mechanical devices", Fig. 5, 8, p. 313, Mechanical Engineering, Leningrad, 1967 - Adjustment device and method.

Claims (2)

1. A lens containing several lenses mounted coaxially in one frame with the housing, intermediate rings-gaskets between the air spaces of the lenses, fixing and fastening elements of the lenses, characterized in that an additional compensator for aligning the optical axis of the lenses is installed in the frame with the housing in front of the lenses, made in the form of a plane-parallel plate in a frame, while the frame is mounted coaxially to the lenses in the mounting element, which compresses the lenses in the housing and has the ability to rotate around its axis, and plane-parallel the plate is mounted in a frame at an angle to the optical axis of the lenses. 2. A method of adjusting the lens, including installing lenses in a frame with a housing, installing intermediate rings-gaskets, fixing lenses with fasteners and locking them, characterized in that the final alignment of the lens is carried out after fastening and locking the lens elements with an additional compensator due to the rotation of the frame with plane-parallel a plate around its axis until the optical axes of the lenses of the lens agree with its subsequent locking.