Photoelectric turntable rotation precision measurement objective lens fixing device

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Through the combination structure of the fixing seat and the shaft end adapter block, the measurement error caused by poor rigidity of the elastic connector and the dial deviation is solved, and the efficiency and accuracy of the rotation accuracy measurement of the photoelectric rotary stage are improved.

CN222299863UActive Publication Date: 2025-01-03HANGZHOU EBOYLAMP ELECTRONICS CO LTD

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Patent Information

Application Number: CN202421031395.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-13
Publication Date: 2025-01-03
Estimated Expiration: 2034-05-13

AI Technical Summary

Technical Problem

In the existing optical rotary table rotation accuracy measurement objective lens fixing device, poor rigidity of the elastic connector leads to poor spatial position stability after the objective lens is adjusted vertically, and the measurement error is large, and the deviation of the external dial and the pitch axis leads to angular uniformity and reverse rotation position. Stability issues.

Method used

The fixing seat is used to directly contact the shaft end adapter block, and the objective lens angle is adjusted through the combination of fixing screws and adjustment screws. The fixing screw is in a loose state. The adjustment screw adjusts the gap between the fixing seat and the shaft end adapter block by twisting to realize the objective lens. Angle adjustment and the scale value on the press ring provides an angle reference directly.

Benefits of technology

The initial perpendicularity between the objective lens and the pitch axis is improved, the adjustment time before measurement is reduced, the position stability is enhanced, the measurement error is reduced, the use of the dial is simplified, and the measurement accuracy problems caused by the dial center deviation is avoided.

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Figure CN222299863U_ABST

Patent Text Reader

Abstract

The utility model discloses a photoelectric rotary table rotation precision measurement objective lens fixing device which comprises a shaft end switching block connected with a pitch shaft of a photoelectric rotary table, a fixing seat, a preset number of fixing screws and adjusting screws, and a pressing ring used for fixing an objective lens, the fixing seat is provided with a through hole, the objective lens is located in the through hole of the fixing seat, and the shaft end switching block is connected with the pitch shaft of the photoelectric rotary table. The pressing ring is installed in the through hole of the fixing base in a threaded mode and located on one side of the objective lens to press the objective lens. According to the photoelectric turntable rotation precision measurement objective lens fixing device, the position angle of the objective lens is adjusted through mutual cooperation of the fixing screw and the adjusting screw, the fixing screw and the adjusting screw are rigidly fixed, the position stability is high, and the problems that in the prior art, an elastic connecting piece is poor in rigidity and poor in stability are solved. And after the mirror surface of the objective lens is adjusted to be vertical, the stability of the spatial position is poor, and trace change can introduce measurement errors.

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Description

Technical Field

[0001] The utility model belongs to the field of photoelectric turntable accuracy, and in particular relates to a photoelectric turntable rotation accuracy measurement objective lens fixing device. Background Art

[0002] The autocollimation method is an important method for measuring the rotation accuracy of the pitch axis of the photoelectric turntable. Before measurement, the reflective objective lens is installed at the end of the pitch axis through a fixing device, and then the objective lens is fine-tuned so that the mirror surface is as perpendicular to the pitch axis as possible. During measurement, the pitch axis is rotated, and the autocollimator readings are recorded at even intervals of a certain rotation angle, and rotated two weeks in the clockwise and counterclockwise directions. The rotation accuracy is then obtained by calculation. Therefore, the objective lens fixing device is required to have the function of fine-tuning the objective lens mirror surface, and the position state of the adjusted mirror surface is maintained as rigidly as possible. At the same time, the higher the angle averaging accuracy during the rotation process and the positioning repeatability accuracy during clockwise and counterclockwise rotation, the better.

[0003] In the prior art, the objective lens fixing device is generally composed of an objective lens fixing seat a, an objective lens fixing pressure ring b, an axis end adapter block c and an elastic connector d, as shown in the schematic diagram. Figure 1 . The objective lens e is mounted on the objective lens holder a and is tightly connected to the objective lens holder a through the objective lens fixing block, and the fixing method is usually screw tightening. The shaft end adapter block c is rigidly connected to the axial end face of the pitch axis f, and the objective lens holder a is connected to the shaft end adapter block c through the elastic connector d. The elastic connector d is usually a material that can achieve elastic deformation, such as a spring or a silicone pad. In the prior art, in order to facilitate the recording of the autocollimator readings at certain rotation angles of the pitch axis, an external angle positioning device is required, usually a dial g installed on the pitch axis f through a adapter rod h, as shown in the schematic diagram. Figure 2 .

[0004] The spatial angle of the objective lens is adjusted by adjusting the degree of compression of the elastic connector so that the objective lens surface is perpendicular to the pitch axis. However, the elastic connector has poor rigidity, and the spatial position stability of the objective lens surface is poor after the vertical adjustment. Slight changes will introduce measurement errors. At the same time, due to the difference in the compression amount of the elastic connector, the initial position of the objective lens is poorly perpendicular to the pitch axis. The process of vertically adjusting the objective lens surface before actual measurement will take a long time. The external dial is fixed by a transfer rod, and there is a deviation between the center of the dial and the center of the pitch axis. There is an error in the angular uniformity of the measurement process, and there is also a risk of offset in the position stability during the forward and reverse rotation processes, all of which will introduce measurement errors. Utility Model Content

[0005] The utility model aims to solve the problems raised in the background technology and provides a device for fixing an objective lens for measuring the rotation accuracy of a photoelectric turntable.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model proposes a photoelectric turntable rotation accuracy measurement objective lens fixing device, comprising an axis end adapter block connected to the pitch axis of the photoelectric turntable, a fixing seat, a preset number of fixing screws and adjusting screws, and a pressure ring for fixing the objective lens, wherein:

[0008] The fixing seat has a through hole, the objective lens is located in the through hole of the fixing seat, the pressure ring is threadedly installed in the through hole of the fixing seat, and is located at one side of the objective lens to press the objective lens;

[0009] Each fixing screw is threadedly connected between the fixing seat and the shaft end adapter block, so that the fixing seat is in contact with the shaft end adapter block, and the fixing screw is in a loose state. Each adjusting screw is threadedly connected to the fixing seat. By turning each adjusting screw to adjust the gap between the fixing seat and the shaft end adapter block, the angle of the objective lens can be adjusted.

[0010] Preferably, the fixing screws are evenly distributed in a first ring shape around the central axis of the objective lens.

[0011] Preferably, the adjusting screws are evenly distributed in a second ring shape around the central axis of the objective lens.

[0012] Preferably, an angle value of 0 to 360 degrees is engraved on the end portion of the pressure ring away from the shaft end adapter block.

[0013] Preferably, the sum of the thickness of the objective lens and the thickness of the pressure ring is greater than the depth of the through hole of the fixing seat.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The objective lens fixing device for measuring the rotation accuracy of the photoelectric turntable directly contacts the shaft end adapter block through the fixing seat, so that the initial verticality between the objective lens and the pitch axis is higher, which reduces the adjustment time before measurement and is more efficient;

[0016] 2. The objective lens fixing device for measuring the rotation accuracy of the photoelectric turntable adjusts the position angle of the objective lens through the cooperation between the fixing screw and the adjusting screw. The fixing screw and the adjusting screw are rigidly fixed and have high position stability, which solves the problems of poor rigidity of the elastic connecting parts in the prior art, poor spatial position stability after the objective lens surface is adjusted vertically, and slight changes will introduce measurement errors;

[0017] 3. The objective lens fixing device for measuring the rotation accuracy of the photoelectric turntable sets the angle value directly on the pressure ring, which is more convenient than setting an additional dial in the prior art, and there is no need to worry about the problem of poor measurement accuracy caused by the deviation between the dial and the center of the pitch axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of an objective lens fixing device for measuring the rotation accuracy of a photoelectric turntable in the prior art;

[0019] Figure 2 It is a schematic diagram of a dial in the prior art;

[0020] Figure 3 It is a schematic diagram of the first viewing angle of the objective lens fixing device for measuring the rotation accuracy of the optoelectronic turntable in the utility model;

[0021] Figure 4 It is a second viewing angle schematic diagram of the objective lens fixing device for measuring the rotation accuracy of the optoelectronic turntable in the utility model.

[0022] Explanation of the reference numerals: 1. shaft end adapter block; 2. fixing seat; 3. fixing screw; 4. adjusting screw; 5. objective lens; 6. pressure ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] like Figure 3-4 As shown, a photoelectric turntable rotation accuracy measurement objective lens fixing device comprises an axis end adapter block 1 connected to the pitch axis of the photoelectric turntable, a fixing seat 2, a preset number of fixing screws 3 and adjusting screws 4, and a pressing ring 6 for fixing the objective lens 5, wherein:

[0026] The fixing seat 2 has a through hole, the objective lens 5 is located in the through hole of the fixing seat 2, the pressure ring 6 is threadedly installed in the through hole of the fixing seat 2, and is located at one side of the objective lens 5 to press the objective lens 5;

[0027] Each fixing screw 3 is threadedly connected between the fixing seat 2 and the shaft end adapter block 1, so that the fixing seat 2 is in contact with the shaft end adapter block 1, and the fixing screw 3 is in a loose state. Each adjusting screw 4 is threadedly connected to the fixing seat 2. By turning each adjusting screw 4 to adjust the gap between the fixing seat 2 and the shaft end adapter block 1, the angle of the objective lens 5 can be adjusted.

[0028] It should be noted that Figure 3 For example, the shaft end adapter block 1 is fixedly installed at the shaft end of the pitch axis (the pitch axis is attached to Figure 3-4 ), in this embodiment, the fixed seat 2 is convex (composed of two cylinders stacked up and down, and the cylinder located on the upper side is hollow and has a through hole), the objective lens 5 is placed in the through hole, the pressure ring 6 is an annular structure, the outer wall has an external thread, the inner wall of the through hole has an internal thread, the pressure ring 6 is threadedly connected and matched with the inner wall of the through hole (wherein the side wall of the pressure ring 6 is provided with four mounting holes i for matching with the installation tool, and the pressure ring 6 is rotated into the through hole of the objective lens 5 by the installation tool), and the pressure ring 6 is located above the objective lens 5, and the objective lens 5 is pressed and fixed; the number of fixing screws 3 and adjusting screws 4 is not limited, and the number of fixing screws 3 and adjusting screws 4 is equal to each other. For example, in this embodiment, the number of fixing screws 3 and adjusting screws 4 is 3, and each fixing screw 3 is threadedly connected between the fixed seat 2 and the shaft end rotation The connecting blocks 1 make the fixing seat 2 and the shaft end adapter block 1 contact each other (in the initial state, and in the initial state, the parallelism between the fixing seat 2 and the shaft end adapter block 1 is not less than IT6), and each fixing screw 3 is in a loose state, and the fixing seat 2 is in direct contact with the shaft end adapter block 1, so that the initial verticality between the objective lens 5 and the pitch axis is higher, which reduces the adjustment time before measurement and is more efficient; each adjusting screw 4 is threadedly connected to the fixing seat 2 (specifically, it is threadedly connected to the end face of the cylinder located below); when it is necessary to adjust the angle of the objective lens 5, by twisting each adjusting screw 4, the bottom end of each adjusting screw 4 is in contact with the shaft end adapter block 1, and the gap between the fixing seat 2 and the shaft end adapter block 1 is changed, thereby adjusting the position angle of the fixing seat 2, and thereby adjusting the angle of the objective lens 5. The above orientation is only for the convenience of description and is not specifically limited. The fixing screw 3, the adjusting screw 4, the shaft end adapter block 1 and the fixing seat 2 are all made of stainless steel. The fixing screw 3 and the adjusting screw 4 are hexagon socket head screws of model GB 70. The optical-electrical turntable rotation precision measurement objective lens fixing device adjusts the position angle of the objective lens through the mutual cooperation between the fixing screw and the adjusting screw. The fixing screw and the adjusting screw are rigidly fixed and have high position stability, which solves the problems of poor rigidity of elastic connectors in the prior art, poor spatial position stability after the objective lens surface is adjusted vertically, and slight changes will introduce measurement errors.

[0029] In one embodiment, the fixing screws 3 are evenly distributed in a first ring shape around the central axis of the objective lens 5. In this embodiment, the three fixing screws 3 are evenly distributed in a first ring shape around the central axis of the objective lens 5, and this arrangement facilitates adjusting the objective lens 5 perpendicular to the pitch axis.

[0030] In one embodiment, the adjusting screws 4 are evenly distributed in a second ring shape around the central axis of the objective lens 5. In this embodiment, the three adjusting screws 4 are evenly distributed in a second ring shape around the central axis of the objective lens 5, which facilitates adjusting the objective lens 5 perpendicular to the pitch axis.

[0031] It should be noted that each fixing screw 3 corresponds to the adjusting screw 4 one by one, and the corresponding fixing screw 3 and adjusting screw 4 are close to each other, which is beneficial to improving the rotation accuracy measurement of the photoelectric turntable.

[0032] In one embodiment, the end of the pressure ring 6 away from the shaft end adapter block 1 is engraved with angle values of 0 to 360 degrees; the resolution is 1 degree, and a long dash is marked every 10 degrees. The engraved angle values of 0 to 360 degrees are located at the top of the pressure ring 6. The material of the pressure ring 6 is stainless steel. By directly setting the angle value on the pressure ring 6, it is more convenient than setting another dial in the prior art, and there is no need to pay attention to the problem of poor measurement accuracy caused by the deviation between the dial and the center of the pitch axis.

[0033] In one embodiment, the sum of the thickness of the objective lens 5 and the thickness of the pressure ring 6 (10 mm in this embodiment) is greater than the depth of the through hole of the fixing seat 2. This arrangement allows the top of the pressure ring 6 to extend to the outside of the through hole, which is convenient for observing the angle value.

[0034] The use process of the photoelectric turntable rotation accuracy measurement objective lens fixing device:

[0035] 1) First, the shaft end adapter block 1 is fixedly connected to the end surface of the pitch axis of the photoelectric turntable;

[0036] 2) Place the objective lens 5 in the through hole of the fixing seat 2, and then thread the pressure ring 6 into the through hole to press and fix the objective lens 5;

[0037] 3) Connect the fixing seat 2 on which the objective lens 5 is installed to the shaft end adapter block 1 through the fixing screws 3, so that the fixing seat 2 and the shaft end adapter block 1 are in contact, and the fixing screws 3 are in a loose state; then install the adjusting screws 4 on the fixing seat 2, and the adjusting screws 4 are in a loose state (the adjusting screws 4 can be installed without being tightened);

[0038] 4) Build an autocollimator measurement platform, observe the autocollimator data, and adjust the position angle of the objective lens 5 by gradually tightening the adjustment screw 4 to adjust the angle with the objective lens 5;

[0039] 5) Rotate the pitch axis, determine the angle of each rotation of the pitch axis through the angle value on the pressure ring 6, and record the measured value.

[0040] Among them, the photoelectric turntable rotation accuracy measurement process is common knowledge in the field and is not an essential content of this application, and will not be described in detail.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-described embodiments only express the more specific and detailed embodiments described in this application, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this application, which all belong to the protection scope of this application. Therefore, the protection scope of the patent application shall be based on the attached claims.

Claims

1. A device for fixing an objective lens for measuring the rotation accuracy of a photoelectric turntable, characterized in that: The photoelectric turntable rotation accuracy measurement objective lens fixing device comprises an axis end adapter block (1) connected to the pitch axis of the photoelectric turntable, a fixing seat (2), a preset number of fixing screws (3) and adjusting screws (4), and a pressure ring (6) for fixing the objective lens (5), wherein: The fixing seat (2) has a through hole, the objective lens (5) is located in the through hole of the fixing seat (2), the pressure ring (6) is threadedly installed in the through hole of the fixing seat (2), and is located on one side of the objective lens (5) to press the objective lens (5); Each fixing screw (3) is threadedly connected between the fixing seat (2) and the shaft end adapter block (1), so that the fixing seat (2) and the shaft end adapter block (1) are in contact, and the fixing screw (3) is in a loose state. Each adjusting screw (4) is threadedly connected to the fixing seat (2). By turning each adjusting screw (4) to adjust the gap between the fixing seat (2) and the shaft end adapter block (1), the angle of the objective lens (5) can be adjusted.

2. The objective lens fixing device for measuring the rotation accuracy of a photoelectric turntable according to claim 1, characterized in that: The fixing screws (3) are evenly distributed in a first ring shape around the central axis of the objective lens (5).

3. The objective lens fixing device for measuring the rotation accuracy of a photoelectric turntable according to claim 1, characterized in that: The adjusting screws (4) are evenly distributed in a second ring shape around the central axis of the objective lens (5).

4. The objective lens fixing device for measuring the rotation accuracy of a photoelectric turntable according to claim 1, characterized in that: An angle value of 0 to 360 degrees is engraved on the end portion of the pressure ring (6) away from the shaft end adapter block (1).

5. The objective lens fixing device for measuring the rotation accuracy of a photoelectric turntable according to claim 1, characterized in that: The sum of the thickness of the objective lens (5) and the thickness of the pressure ring (6) is greater than the depth of the through hole of the fixing seat (2).