Two-degree-of-freedom diaphragm adjusting device

Abstract

The utility model provides a two-degree-of-freedom diaphragm adjusting device, which comprises a diaphragm provided with a threaded hole in the X direction and a guide pin hole in one side; the diaphragm adjusting shell is used for loading a diaphragm; the spring adjusting devices are arranged in the X direction and the Y direction of the diaphragm adjusting shell and used for achieving diaphragm adjustment in the two directions. The X-Y two-degree-of-freedom perpendicular to the light path plane is adjusted, fine adjustment is achieved through a compact mechanical structure, the cost of machining and assembling for achieving high coaxiality is reduced, and the universality of the light path structure is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical path adjustment especially relates to a double freedom diaphragm adjusting device. BACKGROUND

[0002] In the optical system, the diaphragm as the key component of limiting the light beam plays a decisive role in the imaging quality and performance of the system. Due to the limitation of the physical size of the optical part, it is impossible to let any size of light beam pass through, and the actual optical system always images the light beam of a specific aperture. This requires a light hole to constrain the size of the light beam, and this light hole is the aperture diaphragm.

[0003] At present, the adjustment of the diaphragm mainly focuses on adjusting the size of the aperture diaphragm. By manually adjusting the diaphragm, researchers can manually and finely operate the opening and closing degree of the diaphragm according to actual needs, change the aperture size, and then control the light flux passing through. This method is widely used in some scenes where the adjustment speed is not high and the subjective judgment and experience of the operator are emphasized, such as basic optical experiments in small laboratories. Researchers can manually and flexibly adjust the diaphragm aperture at any time during the experiment according to the observed phenomena to obtain the best experimental results.

[0004] And the electrically adjustable diaphragm realizes more accurate, fast and remotely controllable adjustment of the diaphragm aperture. In some optical systems with high automation degree requirements and frequent and fast changes of the diaphragm aperture, electrically adjustable diaphragm has obvious advantages. For example, in large optical detection equipment, the detection process needs to quickly switch the diaphragm aperture according to different detection items and standards. The electrically adjustable diaphragm can quickly respond to instructions, accurately adjust the aperture, and greatly improve the detection efficiency and accuracy.

[0005] The prior art CN117518383A discloses a continuously variable aperture electrically controlled variable diaphragm control method, storage medium and system, including an electrically controlled variable diaphragm device, however, the coaxiality of the diaphragm aperture and the optical axis of the optical path is also not negligible, which is an important indicator of the performance of the optical system. Once the coaxiality error exceeds the allowed range, the consequences will be very serious. When the light beam propagates to the diaphragm, due to the misalignment of the aperture and the optical axis, the light beam cannot pass through the diaphragm according to the pre-set ideal path. Part of the light beam may be unnecessarily blocked by the edge of the diaphragm, causing loss of light energy, making the light intensity distribution on the imaging surface uneven, and thus reducing the contrast and clarity of the imaging. Moreover, this non-ideal light beam passing method may also introduce aberration, causing distortion, blur and other problems in imaging, seriously affecting the subsequent imaging effect and reducing the overall performance of the optical system. UTILITY MODEL CONTENTS

[0006] The utility model discloses a double freedom diaphragm adjusting device, characterized by including:

[0007] The aperture has a threaded hole in the X direction, and a guide pin hole on one side;

[0008] An aperture adjustment housing for mounting the aperture;

[0009] A spring adjustment device is provided in the X and Y directions of the aperture adjustment housing to realize aperture adjustment in two directions;

[0010] The spring adjusting device includes:

[0011] The spring adjusting cylinder has a stepped hole inside and is divided into upper and lower sections. The lower section has threads to be screwed into the aperture adjusting housing, and the upper section is an external hexagonal seat to be loosened or tightened by a wrench.

[0012] A compression spring is disposed within the stepped hole of the upper structure;

[0013] An adjusting bolt is inserted through the compression spring and the stepped hole and screwed into the threaded hole of the lower structure.

[0014] In one embodiment of this utility model, the aperture adjustment housing includes:

[0015] An X-adjustment housing for mounting the aperture, with threaded holes in both the X and Y directions, and a guide pin hole on one side;

[0016] A Y-type aperture adjustment housing is used to mount the X-type aperture adjustment housing. It has a threaded hole in the Y direction and a square groove in the X direction.

[0017] In one embodiment of this utility model, the spring adjusting device includes:

[0018] The lower end face of the spring adjusting cylinder coincides with the right side face of the aperture, and the adjusting bolt is screwed into the threaded hole on the right side of the aperture; and

[0019] The lower end face of the spring adjusting cylinder coincides with the upper end face of the aperture X adjusting housing, and the adjusting bolt is screwed into the threaded hole on the upper end face of the aperture X adjusting housing.

[0020] In one embodiment of the present invention, the aperture adjustment device further includes a set screw for secondary fixation after aperture adjustment;

[0021] The set screw is disposed in the threaded hole on the left side of the aperture X adjustment housing and rests against the left side of the aperture; and

[0022] The set screw is located in the threaded hole on the lower side of the aperture Y adjustment housing and rests against the lower end face of the aperture X adjustment housing.

[0023] In one embodiment of the present invention, the aperture adjustment device further includes a guide pin disposed in the guide pin hole, connecting the aperture and the aperture X adjustment housing, as well as the aperture X adjustment housing and the aperture Y adjustment housing, to ensure the horizontality of the aperture adjustment in both directions.

[0024] In one embodiment of the present invention, the aperture adjustment device further includes a fixing bolt and a fixing pin, for installing and fixing the aperture adjustment device at a designated position.

[0025] In one embodiment of this utility model, the aperture X-adjustment housing has a certain clearance in the Y direction, and the left and right adjustment stroke in the X direction is 3mm.

[0026] In one embodiment of this utility model, the aperture Y-adjustment housing has a certain clearance in the X direction, and the vertical adjustment stroke in the Y direction is 3mm.

[0027] This invention proposes a dual-degree-of-freedom aperture adjustment device, which aims to adjust the X and Y degrees of freedom perpendicular to the optical path plane. Fine-tuning is achieved through a compact mechanical structure, reducing the cost of processing and assembly to achieve high coaxiality, and also making the optical path structure more versatile. Attached Figure Description

[0028] Figure 1 The side view and front view of a dual-degree-of-freedom aperture adjustment device according to an embodiment of the present invention are shown.

[0029] Figure 2 The top view and isometric side view of a dual-degree-of-freedom aperture adjustment device according to an embodiment of the present invention are shown; and

[0030] Figure 3 The diagram shows a cross-sectional view and a perspective view of a dual-degree-of-freedom aperture adjustment device according to an embodiment of the present invention. Detailed Implementation

[0031] In the following description, the present invention is described with reference to various embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more specific details or with other alternatives and / or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail so as not to obscure the inventive aspects of the present invention. Similarly, for illustrative purposes, specific quantities, materials, and configurations are set forth to provide a comprehensive understanding of embodiments of the present invention. However, the present invention is not limited to these specific details.

[0032] In this specification, references to "an embodiment" or "this embodiment" mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing throughout this specification does not necessarily refer to all of the same embodiment.

[0033] In this utility model, the various embodiments are merely intended to illustrate the solution of this utility model and should not be construed as limiting.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 The side view and front view of a dual-degree-of-freedom aperture adjustment device according to an embodiment of the present invention are shown.

[0036] Figure 2 The image shows a top view and an isometric side view of a dual-degree-of-freedom aperture adjustment device according to an embodiment of the present invention.

[0037] like Figure 1 , 2 As shown, in one embodiment of this utility model, the dual-degree-of-freedom aperture adjustment device includes:

[0038] In this embodiment, aperture 01 is 12. A 12mm aperture with a 6mm center aperture, threaded holes in the X direction, and a guide pin hole on one side. Figure 1 (The right side is shown in the illustration). Obviously, the aperture can be any optical element, such as a mirror, prism, lens, pupil, etc. This embodiment only provides one example.

[0039] The aperture X adjustment housing 02 houses the aperture 01, which can be inserted into it. The aperture X adjustment housing 02 has a certain clearance in the Y direction, and the left and right adjustment stroke in the X direction is 3mm. The aperture X adjustment housing 02 has threaded holes in both the X and Y directions, and one side has a guide pin hole. Figure 1 (The top side is shown in the diagram). In this embodiment, the clearance is generally greater than 3mm, and 5mm is used in this embodiment.

[0040] The aperture Y-adjustment housing 03 can accommodate aperture 01 and aperture X-adjustment housing 02. The aperture Y-adjustment housing 03 has a certain clearance in the X direction, and its vertical adjustment stroke in the Y direction is 3mm. 03 has a threaded hole in the Y direction and a square groove milled in the X direction to prevent interference from bolts and other components when the aperture X-adjustment housing 02 moves as a whole. In this embodiment, the clearance is generally greater than 3mm, and 5mm is used in this embodiment.

[0041] Spring adjustment device 04 is used to adjust the aperture 01 in the X and Y directions.

[0042] Figure 3 The diagram shows a cross-sectional view and a perspective view of a dual-degree-of-freedom aperture adjustment device according to an embodiment of the present invention.

[0043] like Figure 3 As shown, the spring adjusting device 04 includes:

[0044] The spring adjusting cylinder 41 is divided into upper and lower sections. The lower end has threads that can be screwed into the adjusting housing, while the upper end is an external hexagonal socket for easy loosening or tightening with a wrench. The spring adjusting cylinder 41 has stepped holes inside.

[0045] Adjusting bolt 42 passes through the compression spring and the stepped hole and is screwed into the threaded hole of the lower structure.

[0046] Compression spring 43 is placed in the upper stepped hole. The spring ensures that the relative positions of spring adjusting device 04 and aperture 01 (or spring adjusting device 04 and aperture X adjusting housing 02) are fixed. After tightening 42, the spring should be in a compressed state. When loosening spring adjusting cylinder 41, if there is no spring reaction force acting on the slender bolt 42, the aperture cannot rebound as 04 is loosened. In this embodiment, the compression spring mainly provides the effect of reaction force, and can also be replaced by mechanical components with equivalent effects such as leaf springs or disc springs.

[0047] Set screw 05 is used for secondary fixation after adjusting aperture 01.

[0048] Guide pin 06 connects aperture 01 to aperture X adjustment housing 02 and aperture X adjustment housing 02 to aperture Y adjustment housing 03, ensuring the horizontality of the X and Y direction adjustments, and also providing secondary fixation for aperture 01. Generally, the guide pin needs to be made of a different material than the two guiding components to avoid metal-to-metal adhesion. In this embodiment, aluminum alloy is used except for guide pin 06, so PEEK material guide pins are used.

[0049] Fixing pin 07 and fixing bolt 08 are used to precisely position the entire adjustment device at a certain location in the optomechanical system.

[0050] The assembly method of the dual-degree-of-freedom aperture adjustment device in this utility model will be described below with reference to specific embodiments.

[0051] During assembly, the assembly is carried out step by step from the inside out. The aperture 01 is placed into the aperture X adjustment housing 02, and the spring adjustment device 04 is screwed in. The lower end face of the spring adjustment cylinder 41 coincides with the right side face of the aperture 01. The adjustment bolt 42 is screwed into the threaded hole on the right side of the aperture 01. The guide pin 06 connects the aperture 01 and the aperture X adjustment housing 02 to ensure the horizontality of the X-direction adjustment and at the same time play a secondary fixing role for the aperture.

[0052] Then, the aperture 01 / aperture X adjustment housing 02 assembly is placed into the aperture Y adjustment housing 03. Similarly, the spring adjustment device 04 is screwed in, with the lower end face of the spring adjustment cylinder 41 coinciding with the upper end face of the aperture X adjustment housing 02. The adjustment bolt 42 is screwed into the threaded hole on the upper end face of the aperture X adjustment housing 02. The guide pin 06 connects the aperture X adjustment housing 02 and the aperture Y adjustment housing 03 to ensure the perpendicularity of the Y-direction adjustment and to provide secondary fixation for the aperture. The set screw 05 is screwed into the threaded hole on the lower side of the aperture Y adjustment housing 03, pressing against the lower end face of the aperture X adjustment housing 02 to prevent slight fluctuations after aperture adjustment. Finally, the aperture adjustment device is installed and fixed in the designated position using the fixing pin 07 and the fixing bolt 08. The assembly of this structure is now complete.

[0053] The following will describe the two-degree-of-freedom adjustment process of the aperture:

[0054] Adjusting the X-degree of freedom of the aperture: Loosen the set screw 05 on the left side. The adjusting bolt 42 on the right side will fix the aperture 01 relative to the spring adjusting device 04. Loosen the spring adjusting cylinder 41 on the right side and unscrew it from the threaded hole of the aperture X adjusting housing 02, causing the aperture 01 to shift to the right. Similarly, tighten the spring adjusting cylinder 41 on the right side and screw it into the threaded hole of the aperture X adjusting housing 02, causing the aperture 01 to shift to the left. After moving to the designated position, tighten the set screw 05 on the left side.

[0055] Adjusting the Y-degree of freedom of the aperture: Loosen the lower set screw 05. The upper adjusting bolt 42 fixes the aperture X adjusting housing 02 relative to the spring adjusting device 04. Loosen the upper spring adjusting cylinder 41 and unscrew it from the threaded hole of the aperture Y adjusting housing 03, causing the aperture 01 to shift upward. Similarly, tighten the upper spring adjusting cylinder 41 and screw it into the threaded hole of the aperture Y adjusting housing 03, causing the aperture 01 to shift downward. After moving to the designated position, tighten the lower set screw 05.

[0056] In this embodiment, the adjustment accuracy mainly depends on the thread pitch at the lower end of the spring adjusting cylinder 41. The adjustment accuracy can also be increased by, for example, using a smaller thread pitch or a more precise adjusting tool such as a micrometer.

[0057] Although various embodiments of the present invention have been described above, it should be understood that they are presented by way of example only and not as limitations. It will be apparent to those skilled in the art that various combinations, modifications, and alterations can be made thereto without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should be defined solely by the appended claims and their equivalents.

Claims

1. A dual-degree-of-freedom aperture adjustment device, characterized in that, include: The aperture has a threaded hole in the X direction, and a guide pin hole on one side; An aperture adjustment housing for mounting the aperture; A spring adjustment device is provided in the X and Y directions of the aperture adjustment housing to realize aperture adjustment in two directions; The spring adjusting device includes: The spring adjusting cylinder has a stepped hole inside and is divided into upper and lower sections. The lower section has threads to be screwed into the aperture adjusting housing, and the upper section is an external hexagonal seat to be loosened or tightened by a wrench. A compression spring is disposed within the stepped hole of the upper structure; An adjusting bolt is inserted through the compression spring and the stepped hole and screwed into the threaded hole of the lower structure.

2. The dual-degree-of-freedom aperture adjustment device according to claim 1, characterized in that, The aperture adjustment housing includes: An X-adjustment housing for mounting the aperture, with threaded holes in both the X and Y directions, and a guide pin hole on one side; A Y-type aperture adjustment housing is used to mount the X-type aperture adjustment housing. It has a threaded hole in the Y direction and a square groove in the X direction.

3. The dual-degree-of-freedom aperture adjustment device according to claim 2, characterized in that, In the spring adjusting device: The lower end face of the spring adjusting cylinder coincides with the right side face of the aperture, and the adjusting bolt is screwed into the threaded hole on the right side of the aperture; and The lower end face of the spring adjusting cylinder coincides with the upper end face of the aperture X adjusting housing, and the adjusting bolt is screwed into the threaded hole on the upper end face of the aperture X adjusting housing.

4. The dual-degree-of-freedom aperture adjustment device according to claim 3, characterized in that, The aperture adjustment device also includes a set screw for secondary fixation after aperture adjustment; The set screw is disposed in the threaded hole on the left side of the aperture X adjustment housing and rests against the left side of the aperture; and The set screw is located in the threaded hole on the lower side of the aperture Y adjustment housing and rests against the lower end face of the aperture X adjustment housing.

5. The dual-degree-of-freedom aperture adjustment device according to claim 2, characterized in that, The aperture adjustment device also includes a guide pin, which is disposed in the guide pin hole and connects the aperture and the aperture X adjustment housing, as well as the aperture X adjustment housing and the aperture Y adjustment housing, to ensure the horizontality of the aperture adjustment in both directions.

6. The dual-degree-of-freedom aperture adjustment device according to claim 1, characterized in that, The aperture adjustment device also includes fixing bolts and fixing pins for installing and fixing the aperture adjustment device in a designated position.

7. The dual-degree-of-freedom aperture adjustment device according to claim 2, characterized in that, The aperture X-adjustment housing has a certain clearance in the Y direction, and the left and right adjustment stroke in the X direction is 3mm.

8. The dual-degree-of-freedom aperture adjustment device according to claim 2, characterized in that, The aperture Y-adjustment housing has a certain clearance in the X direction, and the vertical adjustment stroke in the Y direction is 3mm.

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