Linear guide rail continuous zooming mechanism and adjustment method thereof

Abstract

The invention discloses a linear guide rail continuous zooming mechanism and an adjustment method thereof, and solves the problems that an existing linear guide rail type optical system is large in adjustment difficulty and complex in operation in the adjustment process, and even an optical axis is not horizontal after adjustment is completed. The continuous zooming mechanism specifically comprises a mounting seat, a linear guide rail arranged on the mounting seat in parallel, a movable mirror bracket slidably mounted on the linear guide rail, a driving unit arranged on one side of the linear guide rail and fixedly connected with the movable mirror bracket, a fixed mirror bracket detachably mounted on the mounting seat, and an adjusting unit arranged at the bottom of the mounting seat. A first cross reticle mirror is arranged on the movable mirror bracket; a second cross-shaped reticle mirror is arranged on the fixed mirror bracket; the fixed mirror bracket and the movable mirror bracket are oppositely arranged, so that the first cross-shaped reticle mirror corresponds to the second cross-shaped reticle mirror in position; a mounting pad is arranged between the fixed mirror bracket and the mounting seat; the adjusting unit is used for adjusting the azimuth angle and the pitch angle of the mounting base.

Description

Technical Field

[0001] The invention relates to a continuous zoom mechanism and an adjustment method, and in particular to a linear guide rail continuous zoom mechanism and an adjustment method. Background Art

[0002] At present, there are two common driving methods for zoom groups in zoom optical systems: cam barrel type and linear guide type. The cam barrel can be formed through one-time processing to ensure the motion accuracy between multiple moving groups, and is now widely used. However, with the increase in the number of uses, the cam groove is constantly worn, which often leads to larger matching dimensions between structural parts, resulting in hysteresis, jamming, and reduced imaging quality. In addition, when the aperture of the optical system is large, it is difficult to ensure high-precision processing dimensions with current processing technology, while the linear guide drive form is not limited by size, has a long service life, and has low maintenance costs in the later stage. However, the adjustment method of the zoom optical system in the form of a linear guide is relatively difficult compared to the cam barrel type.

[0003] The Chinese patent with publication number CN106526881B discloses "A method for adjusting the parallelism of linear guides in a continuous zoom thermal imager". It uses an internal focusing collimator telescope for observation and adjusts the pitch, azimuth angle and translation of the linear guide to achieve the parallelism of the linear guide relative to the axis of the fixed mirror reference hole. However, this method requires repeated adjustment of the position of the linear guide, which is difficult to adjust. The entire process is complicated to operate, and even multiple disassembly and assembly cannot complete the adjustment. In addition, after the adjustment is completed, the optical axis of the continuous zoom thermal imager will be uneven, which makes it impossible to use it with other optical systems. Summary of the invention

[0004] The purpose of the present invention is to provide a linear guide continuous zoom mechanism and an adjustment method thereof, so as to solve the technical problems that the existing linear guide optical system is difficult to adjust, the adjustment process is complicated, and even the optical axis is not level after the adjustment is completed.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A linear guide continuous zoom mechanism, which is special in that it comprises a mounting seat, a linear guide parallel to the mounting seat, a movable mirror frame slidably mounted on the linear guide, a driving unit arranged at one side of the linear guide and fixedly connected to the movable mirror frame, a fixed mirror frame detachably mounted on the mounting seat, and an adjustment unit arranged at the bottom of the mounting seat;

[0007] The movable mirror frame is provided with a first cross-shaped graticule mirror;

[0008] A second cross-reticulated mirror is provided on the fixed mirror frame;

[0009] The fixed mirror frame and the movable mirror frame are arranged opposite to each other so that the first cross-shaped graticule mirror and the second cross-shaped graticule mirror are located in corresponding positions;

[0010] The driving unit is used to drive the movable mirror frame to move along the linear guide rail, so that the movable mirror frame approaches or moves away from the fixed mirror frame;

[0011] A mounting pad is provided between the fixed mirror frame and the mounting seat;

[0012] The adjustment unit is used to adjust the azimuth angle and the pitch angle of the mounting seat.

[0013] Furthermore, the driving unit includes a screw motor, a nut and a nut adapter;

[0014] The body of the screw motor is fixedly connected to the mounting seat, and the output shaft of the screw motor faces the movable mirror frame; the movable mirror frame is provided with an avoidance notch for the output shaft;

[0015] The nut is sleeved on the output shaft of the screw motor and is threadedly connected thereto;

[0016] One end of the nut adapter is fixedly connected to the outer wall of the nut, and the other end is fixedly connected to the movable mirror frame.

[0017] Further, the nut adapter is S-shaped;

[0018] A connecting plate is provided on the outer wall of the nut;

[0019] One end of the S-shaped nut adapter is bent toward the direction of the output shaft and fixedly connected to the nut through the connecting plate, and the other end is bent away from the output shaft and fixedly connected to the movable mirror frame.

[0020] Furthermore, the connecting plate and the nut are integrally arranged.

[0021] Further, the nut is an anti-backlash nut;

[0022] The anti-backlash nut is made of polytetrafluoroethylene.

[0023] Furthermore, the mounting seat is provided with a long strip-shaped groove;

[0024] The bottom of the linear guide rails are respectively provided with long strip-shaped convex ridges;

[0025] The convex ridges are engaged with the concave-convex grooves.

[0026] Furthermore, the adjustment unit is a three-dimensional adjustment frame.

[0027] A method for assembling and adjusting the linear guide continuous zoom mechanism is characterized in that it comprises the following steps:

[0028] Step 1: Center and install the first cross-graticule plate on the movable frame, and center and install the second cross-graticule mirror on the fixed frame; install the movable frame on the mounting seat through a linear guide rail, and set the mounting seat on the adjustment unit; at the same time, set the theodolite on one side of the mounting seat and the adjustment unit;

[0029] Step 2, adjust the adjustment unit so that when the movable mirror frame is located at either end of the linear guide rail, the optical axis cross of the theodolite coincides with the cross image in the first cross-reticle plate;

[0030] Step 3: Install the fixed mirror frame on the mounting seat through the mounting pad, and trim the mounting surface of the mounting pad so that the cross images on the second cross-graffiti plate and the first cross-graffiti plate coincide with the cross of the optical axis of the theodolite, thereby completing the adjustment of the continuous zoom mechanism.

[0031] Furthermore, step 2 is specifically as follows:

[0032] 2.1. Drive the movable mirror frame to one end of the linear guide rail through the screw motor, and adjust the adjustment unit so that the optical axis cross of the theodolite coincides with the cross image in the first cross-reticle plate;

[0033] 2.2. Drive the movable mirror frame to the other end of the linear guide rail through the screw motor, and adjust the adjustment unit so that the optical axis cross of the theodolite coincides with the cross image in the first cross-reticle plate;

[0034] 2.3. Repeat steps 2.1 and 2.2 until the movable mirror frame is located at either end of the linear guide rail and the optical axis cross of the theodolite coincides with the cross image in the first cross-reticle plate.

[0035] Furthermore, step 1 is specifically as follows:

[0036] Center the first cross-graticule plate and install it on the movable mirror frame, and ensure that the radial clearance is less than 0.006mm; center the second cross-graticule mirror and install it on the fixed mirror frame, and ensure that the radial clearance is less than 0.006mm; install the movable mirror frame on the mounting seat through a linear guide; set the mounting seat on the adjustment unit; and set the theodolite on one side of the mounting seat and the adjustment unit.

[0037] Beneficial effects of the present invention:

[0038] 1. The present invention provides a linear guide continuous zoom mechanism and an installation method thereof. The installation is simple and efficient. During the installation process, the three-dimensional adjustment table is adjusted, and the installation surface of the installation pad only needs to be trimmed once to complete the installation.

[0039] 2. The present invention adopts a high-precision theodolite and a precision three-dimensional adjustment frame to realize a contactless adjustment method, which can achieve optical axis consistency better than two pixels.

[0040] 3. The linear guide continuous zoom mechanism and its installation method provided by the present invention are suitable for optical systems with large aperture and high magnification ratio, and have a long service life.

[0041] 4. The present invention can achieve precise horizontality of the optical axis of the zoom mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a linear guide continuous zoom mechanism and a theodolite of the present invention;

[0043] Figure 2 is a schematic structural diagram of a driving unit and a movable mirror frame in an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of the structure of the mounting base in the embodiment of the present invention.

[0045] Figure Number:

[0046] 1-mounting seat, 11-groove, 2-linear guide, 3-movable mirror frame, 31-first cross-reflective mirror, 4-anti-backlash nut, 5-screw motor, 6-nut adapter, 7-fixed mirror frame, 71-second cross-reflective mirror, 8-three-dimensional adjustment frame. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The embodiment of the present invention provides a linear guide continuous zoom mechanism, such as Figure 1 As shown, it includes a mounting seat 1, a linear guide rail 2 mounted on the mounting seat 1 by screws, a movable mirror frame 3 slidably mounted on the linear guide rail 2, a driving unit arranged at one side of the linear guide rail 2 and fixedly connected to the movable mirror frame 3, a fixed mirror frame 7 detachably mounted on the mounting seat 1, and an adjustment unit arranged at the bottom of the mounting seat 1;

[0049] The linear guide rail 2 can be a single guide rail or a double guide rail, and is used for the movement of the moving mirror group. In this embodiment, a double guide rail is preferred, and a moving mirror frame 3 is included.

[0050] The mounting seat 1 is provided with two parallel long grooves 11; the bottoms of the two linear guide rails are provided with long convex ridges; the two convex ridges are respectively engaged with the two grooves 11. The mounting seat 1 is used to mount the optical system. The mounting seat can be designed in other forms according to the system and has a high enough strength to avoid deformation during installation or use. The concave-convex engagement structure has good processing accuracy and can ensure the parallelism of the two guide rails after installation.

[0051] A first cross-graticule mirror 31 is arranged on the movable mirror frame 3; the first cross-graticule mirror 31 and the movable mirror frame 3 are centeringly assembled, and the radial clearance between the two is less than 0.006mm; the movable mirror frame 3 and the first cross-graticule mirror 31 constitute a movable mirror group, and the movable mirror group is a moving part in the zoom optical system, preferably a focusing, magnification or compensation lens group; there can be one or more movable mirror groups on the linear guide.

[0052] A second cross-graticule mirror 71 is arranged on the fixed mirror frame 7; similarly, the second cross-graticule mirror 71 and the fixed mirror frame 7 are also assembled in a centering manner, and the radial clearance between the two is also less than 0.006 mm; the fixed mirror frame 7 and the second cross-graticule mirror 71 form a fixed mirror group, which is a fixed part in the zoom optical system. The fixed mirror group can be one group or multiple groups, and can be arranged in front of or behind the movable mirror group. A mounting pad is arranged between the fixed mirror frame 7 and the mounting seat 1.

[0053] The movable mirror frame 3 and the fixed mirror frame 7 are arranged opposite to each other, so that the positions of the first cross-graticule mirror 31 and the second cross-graticule mirror 71 correspond to each other.

[0054] The driving unit is used to drive the movable mirror frame 3 to move along the linear guide rail 2, so that the movable mirror frame 3 is close to or away from the fixed mirror frame 7. Specifically, the driving unit includes a screw motor 5, an anti-backlash nut 4 and a nut adapter 6; the body of the screw motor 5 is fixedly connected to the mounting seat 1 by screws, and its output shaft faces the movable mirror frame 3; the movable mirror frame 3 is provided with an avoidance notch for the output shaft; the screw motor 5 is used to drive the movable mirror group, and its output shaft is in the form of a screw, and different lead and screw lengths can be selected according to the size of the optical system. The anti-backlash nut is generally selected in conjunction with the screw motor to prevent backlash or jamming, that is, to prevent return difference; in this embodiment, the anti-backlash nut 4 is mounted on the output shaft of the screw motor 5 and is threadedly connected thereto; the anti-backlash nut 4 is made of polytetrafluoroethylene; a triangular connecting plate is provided on the outer wall of the anti-backlash nut 4; the connecting plate and the nut are integrated. The nut adapter 6 is used to connect the anti-backlash nut and the movable mirror group; the nut adapter 6 in this embodiment is S-shaped; one end of the S-shaped nut adapter 6 is bent toward the direction of the output shaft and fixedly connected to the nut through a connecting plate, and the other end is bent away from the output shaft and finally fixedly connected to the movable mirror frame 3.

[0055] The adjustment unit is used to adjust the azimuth angle and the pitch angle of the mounting seat 1 , and the adjustment unit is preferably a three-dimensional adjustment frame 8 .

[0056] The above-mentioned method for assembling and adjusting the linear guide continuous zoom mechanism comprises the following steps:

[0057] Step 1: Assembly and construction:

[0058] 1.1. Center the first cross-graticule plate 31 on the movable mirror frame 3, and ensure that the radial clearance is less than 0.006 mm; center the second cross-graticule mirror 71 on the fixed mirror frame 7, and ensure that the radial clearance is less than 0.006 mm;

[0059] 1.2. Zoom mechanism assembly;

[0060] The movable mirror frame 3 is mounted on the mounting seat 1 through the linear guide rail 2, and is arranged at any extreme position of the movable range, and is connected to the screw motor 5 through the anti-backlash nut 4 and the nut adapter 6;

[0061] 1.3. Installation and adjustment system construction;

[0062] The mounting seat 1 is set on the three-dimensional adjustment frame 8; at the same time, the theodolite 9 is set on one side of the mounting seat 1 and the three-dimensional adjustment frame 8.

[0063] Step 2: Coaxial debugging;

[0064] Adjust the three-dimensional adjustment frame 8 so that when the movable mirror frame 3 is located at any end of the linear guide rail 2, the optical axis cross of the theodolite 9 coincides with the cross image in the first cross-reticulated plate 31; specifically:

[0065] 2.1. Drive the movable mirror frame 3 to one end of the linear guide rail 2 by means of the screw motor 5, and adjust the adjustment unit so that the optical axis cross of the theodolite 9 coincides with the cross image in the first cross-reticle plate 31;

[0066] 2.2. Drive the movable mirror frame 3 to the other end of the linear guide rail 2 by means of the screw motor 5, and adjust the adjustment unit so that the optical axis cross of the theodolite 9 coincides with the cross image in the first cross-reticle plate 31;

[0067] 2.3. Repeat steps 2.1 and 2.2 until the optical axis cross of the theodolite 9 coincides with the cross image in the first cross-reticle plate 31 when the movable mirror frame 3 is located at either end of the linear guide rail 2. During adjustment, if the optical axis cross of the theodolite 9 does not coincide with the cross image in the first cross-reticle plate 31, adjust the azimuth and elevation angles of the three-dimensional adjustment frame 8 to make the optical axis cross of the theodolite 9 coincide with the cross image in the first cross-reticle plate 31;

[0068] Step 3: Install the fixed mirror group and adjust the level;

[0069] The fixed mirror frame 7 is mounted on the mounting seat 1 through the mounting pad, the optical axis cross of the theodolite 9 is adjusted to be horizontal, and the mounting surface of the mounting pad is trimmed so that the cross images on the second cross-graticule plate 71 and the first cross-graticule plate 31 coincide with the optical axis cross of the theodolite 9, thereby completing the adjustment of the continuous zoom mechanism.

[0070] The adjustment method uses a theodolite, a first cross-grained plate, a second cross-grained plate, and a three-dimensional adjustment frame. The axis of the moving mirror frame on the linear guide is found through the theodolite, and then the position of the fixed mirror frame is adjusted so that the optical axis of the moving mirror frame coincides with the optical axis of the fixed mirror frame. Finally, the horizontal direction of the theodolite is leveled, the collimated image of the second cross-grained plate on the fixed mirror frame is observed, and the mounting surface of the mounting pad is trimmed so that the collimated image of the second cross-grained plate on the fixed mirror frame coincides with the crosshairs in the theodolite. This method effectively solves the problem that the optical axis of the moving lens group in the guide rail zoom mechanism does not coincide with the optical axis of the fixed lens group, and the problem that the optical axis of the zoom system is not horizontal. The above method can be used to complete the adjustment of the continuous zoom mechanism and achieve an optical axis consistency better than 2 pixels.

[0071] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A linear guide continuous zoom mechanism, characterized in that: The invention comprises a mounting seat (1), a linear guide rail (2) arranged parallel to the mounting seat (1), a movable mirror frame (3) slidably mounted on the linear guide rail (2), a driving unit arranged on one side of the linear guide rail (2) and fixedly connected to the movable mirror frame (3), a fixed mirror frame (7) detachably mounted on the mounting seat (1), and an adjustment unit arranged at the bottom of the mounting seat (1); The movable mirror frame (3) is provided with a first cross-shaped graticule (31); A second cross-shaped graticule (71) is provided on the fixed mirror frame (7); The fixed mirror frame (7) and the movable mirror frame (3) are arranged relative to each other, so that the first cross-shaped dividing mirror (31) and the second cross-shaped dividing mirror (71) are located in corresponding positions; The driving unit is used to drive the movable mirror frame (3) to move along the linear guide rail (2), thereby making the movable mirror frame (3) approach or move away from the fixed mirror frame (7); A mounting pad is provided between the fixed mirror frame (7) and the mounting seat (1); The adjustment unit is used to adjust the azimuth angle and the elevation angle of the mounting seat (1).

2. The linear guide continuous zoom mechanism according to claim 1, characterized in that: The driving unit comprises a screw motor (5), a nut and a nut adapter (6); The body of the screw motor (5) is fixedly connected to the mounting seat (1), and its output shaft faces the movable mirror frame (3); the movable mirror frame (3) is provided with an avoidance notch for the output shaft; The nut is sleeved on the output shaft of the screw motor (5) and is threadedly connected thereto; One end of the nut adapter (6) is fixedly connected to the outer wall of the nut, and the other end is fixedly connected to the movable mirror frame (3).

3. The linear guide continuous zoom mechanism according to claim 2, characterized in that: The nut adapter (6) is S-shaped; A connecting plate is provided on the outer wall of the nut; One end of the S-shaped nut adapter (6) is bent in the direction of the output shaft and fixedly connected to the nut via the connecting plate, and the other end is bent in the direction away from the output shaft and fixedly connected to the movable mirror frame (3).

4. The linear guide continuous zoom mechanism according to claim 3, characterized in that: The connecting plate and the nut are integrated.

5. The linear guide continuous zoom mechanism according to claim 4, characterized in that: The nut is a backlash-eliminating nut (4); The anti-backlash nut (4) is made of polytetrafluoroethylene.

6. The linear guide continuous zoom mechanism according to any one of claims 1 to 5, characterized in that: The mounting seat (1) is provided with a long strip-shaped groove (11); The bottom of the linear guide rail (2) is respectively provided with long strip-shaped convex ridges; The convex ridges are engaged with the concave-convex grooves (11).

7. The linear guide continuous zoom mechanism according to claim 6, characterized in that: The adjustment unit is a three-dimensional adjustment frame (8).

8. A method for assembling and adjusting the linear guide continuous zoom mechanism according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1, centering and mounting the first cross-graticule plate (31) on the movable mirror frame (3), centering and mounting the second cross-graticule mirror (71) on the fixed mirror frame (7); mounting the movable mirror frame (3) on the mounting seat (1) through the linear guide rail (2), and setting the mounting seat (1) on the adjustment unit; and at the same time, setting the theodolite (9) on one side of the mounting seat (1) and the adjustment unit; Step 2, adjusting the adjustment unit so that when the movable mirror frame (3) is located at any end of the linear guide rail (2), the optical axis cross of the theodolite (9) coincides with the cross image in the first cross-reticulated plate (31); Step 3, the fixed mirror frame (7) is mounted on the mounting seat (1) via the mounting pad, and the mounting surface of the mounting pad is trimmed so that the cross images on the second cross-grain plate (71) and the first cross-grain plate (31) are both overlapped with the cross of the optical axis of the theodolite (9), thereby completing the adjustment of the continuous zoom mechanism.

9. The method for assembling and adjusting the linear guide continuous zoom mechanism according to claim 8, characterized in that: Step 2 is as follows: 2.

1. Drive the movable mirror frame (3) to one end of the linear guide rail (2) by means of a screw motor (5), and adjust the adjustment unit so that the optical axis cross of the theodolite (9) coincides with the cross image in the first cross-reticle plate (31); 2.

2. Drive the movable mirror frame (3) to the other end of the linear guide rail (2) by means of a screw motor (5), and adjust the adjustment unit so that the optical axis cross of the theodolite (9) coincides with the cross image in the first cross-reticulated plate (31); 2.

3. Repeat steps 2.1 and 2.2 until the movable mirror frame (3) is located at either end of the linear guide rail (2), and the optical axis cross of the theodolite (9) coincides with the cross image in the first cross-reticle plate (31).

10. The method for assembling and adjusting the linear guide continuous zoom mechanism according to claim 9, characterized in that: Step 1 is as follows: The first cross-graticule plate (31) is mounted on the movable mirror frame (3) in a centered manner, and the radial clearance is ensured to be less than 0.006 mm; the second cross-graticule mirror (71) is mounted on the fixed mirror frame (7) in a centered manner, and the radial clearance is ensured to be less than 0.006 mm; the movable mirror frame (3) is mounted on the mounting seat (1) via a linear guide rail (2); the mounting seat (1) is arranged on the adjustment unit; and a theodolite (9) is arranged on one side of the mounting seat (1) and the adjustment unit.

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