Four-axis adjusting optical fiber focusing structure

Abstract

The utility model discloses a four-axis adjusting optical fiber focusing structure, which comprises an optical path base, an L-shaped adjusting base and an inclination angle adjusting block, the inside of the inclination angle adjusting block is movably connected with a collimation focusing lens cone, one side of the optical path base is fixedly provided with a first rotating cylindrical pin, one side of the L-shaped adjusting base is provided with a first adjusting hole, and the other side of the L-shaped adjusting base is provided with a second rotating cylindrical pin. Relates to the technical field of precision optical fiber lens group adjustment. On one hand, a first rotating cylindrical pin and a first adjusting hole which are matched with each other are arranged between the light path base and the L-shaped adjusting base, and a second rotating cylindrical pin and a second adjusting hole which are matched with each other are also arranged between the light path base and the inclination angle adjusting block; therefore, a two-dimensional plane coordinate system is established by taking the rotation direction of the L-shaped adjusting base and the light path base as the X axis and the rotation direction of the L-shaped adjusting base and the inclination angle adjusting block as the Y axis, so that the L-shaped adjusting base can realize accurate rotation adjustment around the X axis and the Y axis through the two-dimensional plane coordinate system.

Description

Technical Field

[0001] The utility model relates to the technical field of precision optical fiber lens group adjustment, in particular to a four-axis adjustable fiber focusing structure. Background Art

[0002] Distance measurement by optical interference is a widely used precision distance measurement method. However, to implement this method, it is necessary to ensure that the light passing through the optical fiber can return to the optical fiber through the original path after reflection. The more light returns to the optical fiber, the better the signal collected, and the higher the accuracy and precision of the measurement. However, the inner diameter of the optical fiber is only 0.01mm, so a structure that can accurately adjust the position of the lens barrel is required. At the same time, the structure needs to be vibration-resistant, shock-resistant and weather-resistant, and maintain high stability and reliability over a long period of time.

[0003] The patent with publication number CN206114964U discloses a fiber optic automatic focusing mechanism, which specifically discloses the technical solution of "the utility model discloses a fiber optic automatic focusing mechanism, including a stepper motor, a cam, a lens adjustment block, a lens mount and a lens, the stepper motor, the cam, the lens adjustment block and the lens mount are sequentially connected in transmission, the lens is vertically arranged to the lens mount, and the lens mount and the lens are fixedly connected. The lens adjustment block is an elastic lens adjustment block. The lens is located inside the lens mount, and the lens mount is fixed to the outer ring of the lens by a clamp. The end of the stepper motor close to the cam is fixedly connected with a screw hole" and realizes the technical effect of "the advantages of the utility model: by sequentially connecting the stepper motor, the cam, the lens adjustment block and the lens mount in transmission, the stepper motor can be controlled by a pulse signal to rotate and adjust the lens displacement, the adjustment accuracy is high, and compared with gear adjustment, the noise is small and the cost is low".

[0004] However, although the device can perform infinite adjustment of the lens rotation through pulse signals during actual use, the adjustment freedom of the device is low, resulting in a reduction in the range of movement of the lens and the information collected and captured. Utility Model Content

[0005] The purpose of the utility model is to provide a four-axis adjustable fiber optic focusing structure, which improves the problems of insufficient lens activity range and insufficient information collection during stepless adjustment of optical lenses in the prior art through multi-degree-of-freedom adjustment, while realizing stepless adjustment of the lens to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a four-axis adjustable optical fiber focusing structure, comprising an optical path base, an L-shaped adjustment base and an inclination adjustment block, wherein the inclination adjustment block is internally movably connected with a collimating focusing lens barrel, and the optical path base, the L-shaped adjustment base and the inclination adjustment block establish a coordinate system in which the collimating focusing lens barrel can move in multiple directions based on themselves.

[0007] As a further solution of the present utility model: a first rotating cylindrical pin is fixedly installed on one side of the optical path base, a first adjustment hole is provided on one side of the L-shaped adjustment base, the first rotating cylindrical pin is adapted to the first adjustment hole, a second rotating cylindrical pin is fixedly connected to one side of the inclination adjustment block, a second adjustment hole is provided on one side of the L-shaped adjustment base, and the second rotating cylindrical pin is adapted to the second adjustment hole.

[0008] As a further solution of the present utility model: it further includes a first fixing screw, the first fixing screw is screwed to the L-shaped adjustment base, and one end of the first fixing screw passing through the L-shaped adjustment base is movably connected to the inclination adjustment block.

[0009] As a further solution of the present utility model: it further includes a second fixing screw, the second fixing screw is screwed to the collimating and focusing lens barrel, and one end of the second fixing screw passing through the collimating and focusing lens barrel is movably connected to the inclination adjustment block.

[0010] As a further solution of the present utility model: it further includes a third fixing screw, the third fixing screw is screwed to the L-shaped adjustment base, and one end of the third fixing screw passing through the L-shaped adjustment base is movably connected to the optical path base.

[0011] As a further solution of the present utility model: an APC lens barrel is fixedly installed on one side of the collimating and focusing lens barrel away from the inclination adjustment block, and an optical fiber head is fixedly connected to one side of the APC lens barrel away from the collimating and focusing lens barrel.

[0012] As a further solution of the present utility model: a hexagonal opening structure is provided at the driving end of each screw.

[0013] As a further solution of the present utility model: it further includes a gasket, one side of the gasket is movably connected to the collimating and focusing lens barrel and the other side is movably connected to the second fixing screw.

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

[0015] 1. On the one hand, since a first rotating cylindrical pin adapted to the first adjustment hole is provided between the optical path base and the L-shaped adjustment base, and a second rotating cylindrical pin adapted to the second adjustment hole is also provided between the optical path base and the inclination adjustment block. Therefore, taking the rotation direction of the L-shaped adjustment base and the optical path base as the X-axis and the rotation direction of the L-shaped adjustment base and the inclination adjustment block as the Y-axis to establish a two-dimensional plane coordinate system, the L-shaped adjustment base can achieve precise rotation adjustment around the X-axis and the Y-axis through the two-dimensional plane coordinate system;

[0016] 2. By moving the APC lens barrel and the collimating focusing lens barrel forward and backward, the focal length of the fiber optic head can be adjusted. The position of the lens can be adjusted by the adaptation of the set screw and the adjustment hole. The structure of the utility model is simple and convenient to adjust, without the need for additional adjustment tools, with firm locking. After the adjustment is completed, there is no internal stress in the parts, and the structural stability is high, which can resist vibration and impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the disassembly of the overall structure in a four-axis adjustable fiber optic focusing structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the overall structure in a four-axis adjustable fiber optic focusing structure of the present utility model;

[0019] In the figure: 1. Optical path base; 2. L-shaped adjustment base; 3. Tilt adjustment block; 4. Collimating focusing lens barrel; 5. APC lens barrel; 6. Fiber optic head; 7. First rotating cylindrical pin; 8. Second rotating cylindrical pin; 9. First adjustment hole; 10. Second adjustment hole; 11. First fixing screw; 12. Second fixing screw; 13. Set screw; 14. Adjustment hole; 15. Gasket; 16. Third fixing screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model.

[0021] Referring to Figure 1 and Figure 2 As shown, in an embodiment of the present utility model, a four-axis adjustable fiber optic focusing structure includes an optical path base 1, an L-shaped adjustment base 2, and a tilt adjustment block 3. The optical path base 1, the L-shaped adjustment base 2, and the tilt adjustment block 3 establish a coordinate system in which the collimating focusing lens barrel 4 can move in multiple directions with itself as a reference. The collimating focusing lens barrel 4 is movably connected inside the tilt adjustment block 3. A first rotating cylindrical pin 7 is fixedly installed on one side of the optical path base 1. A first adjustment hole 9 is provided on one side of the L-shaped adjustment base 2. The first rotating cylindrical pin 7 is adapted to the first adjustment hole 9. A second rotating cylindrical pin 8 is fixedly connected to one side of the tilt adjustment block 3. A second adjustment hole 10 is provided on one side of the L-shaped adjustment base 2. The second rotating cylindrical pin 8 is adapted to the second adjustment hole 10.

[0022] Other embodiments of the present utility model: Referring to Figure 1, on the one hand, since a first rotating cylindrical pin 7 and a first adjustment hole 9 which are adapted to each other are provided between the optical path base 1 and the L-shaped adjustment base 2, and a second rotating cylindrical pin 8 and a second adjustment hole 10 which are adapted to each other are also provided between the optical path base 1 and the inclination adjustment block 3, a two-dimensional plane coordinate system is established with the rotation direction of the L-shaped adjustment base 2 and the optical path base 1 as the X-axis and the rotation direction of the L-shaped adjustment base 2 and the inclination adjustment block 3 as the Y-axis, so that the L-shaped adjustment base 2 can achieve precise rotation adjustment around the X-axis and the Y-axis through the two-dimensional plane coordinate system.

[0023] Other embodiments of the present utility model: Refer to Figure 1 , further comprising a first fixing screw 11, a second fixing screw 12 and a gasket 15. The first fixing screw 11 is in threaded connection with the L-shaped adjustment base 2. One end of the first fixing screw 11 passing through the L-shaped adjustment base 2 is movably connected to the inclination adjustment block 3. The second fixing screw 12 is in threaded connection with the collimating and focusing lens barrel 4. One end of the second fixing screw 12 passing through the collimating and focusing lens barrel 4 is movably connected to the inclination adjustment block 3. One side of the gasket 15 is movably connected to the collimating and focusing lens barrel 4 and the other side is movably connected to the second fixing screw 12; the adjustment position is locked by the first fixing screw 11 or the second fixing screw 12, and the parallel movement adjustment along the XY axis can be realized by the fitting of the collimating and focusing lens barrel 4 and the inclination adjustment block 3.

[0024] Other embodiments of the present utility model: Refer to Figure 1 , an APC lens barrel 5 is fixedly installed on one side of the collimating and focusing lens barrel 4 away from the inclination adjustment block 3, and an optical fiber head 6 is fixedly connected to one side of the APC lens barrel 5 away from the collimating and focusing lens barrel 4. First, the focal length of the optical fiber head 6 can be adjusted by the forward and backward movement of the APC lens barrel 5 and the collimating and focusing lens barrel 4. Second, the lens position can be adjusted by the adaptation of the set screw 13 and the adjustment hole 14. The structure of the present utility model is simple, the adjustment is convenient, no additional adjustment tooling is required, the locking is firm, there is no internal stress in the parts after the adjustment is completed, and the structural stability is high, and it can resist vibration and impact.

[0025] The working principle of the present utility model is as follows: By installing an L-shaped adjustment base 2 on the optical path base 1, an inclination adjustment block 3 and a collimating focusing lens barrel 4 are installed on the L-shaped adjustment base 2. The technical path is that there are rotating positioning pins that can move in two directions, namely the X-axis and the Y-axis, between the optical path base 1 and the L-shaped adjustment base 2. At the same time, adjustment holes adapted to the rotating positioning pins are provided on the parts. Therefore, precise rotational adjustment of the inclination adjustment block 3 and the collimating focusing lens barrel 4 around the X-axis and the Y-axis can be achieved through the movement of the rotating positioning pins and the adjustment holes, and then the adjustment position is locked by fixing screws. In this process, on the one hand, through the fitting of the collimating focusing lens barrel 4 and the inclination adjustment block 3, parallel movement adjustment of the XY axes can be achieved, and the adjustment position can be locked by fixing screws. On the other hand, the focal length adjustment of the optical fiber head 6 can be achieved through the forward and backward movement of the collimating focusing lens barrel 4 and the APC lens barrel 5, and the adjustment position can also be fixed by the set screws 13.

[0026] The above-mentioned is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A four-axis adjustable optical fiber focusing structure, characterized in that: The invention comprises an optical path base (1), an L-shaped adjustment base (2) and an inclination adjustment block (3); the inclination adjustment block (3) is internally movably connected to a collimating and focusing lens barrel (4); the optical path base (1), the L-shaped adjustment base (2) and the inclination adjustment block (3) establish a coordinate system of the collimating and focusing lens barrel (4) that is movable in multiple directions based on themselves.

2. The four-axis adjustable optical fiber focusing structure according to claim 1, characterized in that: A first rotating cylindrical pin (7) is fixedly mounted on one side of the optical path base (1), a first adjustment hole (9) is opened on one side of the L-shaped adjustment base (2), and the first rotating cylindrical pin (7) is matched with the first adjustment hole (9).

3. The four-axis adjustable optical fiber focusing structure according to claim 2, characterized in that: A second rotating cylindrical pin (8) is fixedly connected to one side of the inclination adjustment block (3), a second adjustment hole (10) is provided on one side of the L-shaped adjustment base (2), and the second rotating cylindrical pin (8) is matched with the second adjustment hole (10).

4. The four-axis adjustable optical fiber focusing structure according to claim 3, characterized in that: It also comprises a first fixing screw (11), the first fixing screw (11) being threadedly connected to the L-shaped adjustment base (2), and the first fixing screw (11) passing through one end of the L-shaped adjustment base (2) to be movably connected to the inclination adjustment block (3).

5. The four-axis adjustable optical fiber focusing structure according to claim 4, characterized in that: It also comprises a third fixing screw (16), the third fixing screw (16) being threadedly connected to the L-shaped adjustment base (2), and the third fixing screw (16) passing through one end of the L-shaped adjustment base (2) to be movably connected to the optical path base (1).

6. The four-axis adjustable optical fiber focusing structure according to claim 5, characterized in that: It also comprises a second fixing screw (12), the second fixing screw (12) being threadedly connected to the collimating and focusing lens barrel (4), and the second fixing screw (12) passing through one end of the collimating and focusing lens barrel (4) and being movably connected to the tilt adjustment block (3).

7. The four-axis adjustable optical fiber focusing structure according to claim 6, characterized in that: An APC lens barrel (5) is fixedly mounted on a side of the collimating and focusing lens barrel (4) away from the tilt angle adjustment block (3).

8. The four-axis adjustable optical fiber focusing structure according to claim 7, characterized in that: A side of the APC lens barrel (5) away from the collimating and focusing lens barrel (4) is fixedly connected to an optical fiber head (6).

9. The four-axis adjustable optical fiber focusing structure according to claim 8, characterized in that: The driving end of each screw is provided with a hexagonal mouth structure.

10. The four-axis adjustable optical fiber focusing structure according to claim 9, characterized in that: It also comprises a gasket (15), one side of which is movably connected to the collimating and focusing lens barrel (4), and the other side of which is movably connected to the second fixing screw (12).

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