CN111458896A - Image surface butt joint and coaxial adjusting device and method for full-waveband high-precision zoom optical system - Google Patents
Image surface butt joint and coaxial adjusting device and method for full-waveband high-precision zoom optical system Download PDFInfo
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Abstract
The invention provides an image plane butt joint and coaxial adjusting device and method for a full-waveband high-precision zooming optical system, and solves the problems of low efficiency, easy damage to an imaging assembly and low image plane adjusting precision of an existing zooming optical lens image plane adjusting method. The device comprises an optical platform, a grating ruler, a display, a light source, a full-waveband collimator, a zoom lens fixing mechanism and an image plane adjusting component, wherein the full-waveband collimator, the zoom lens fixing mechanism and the image plane adjusting component are sequentially arranged along the emergent direction of the light source; the full-waveband collimator is arranged on the optical platform; the zoom lens fixing mechanism is arranged on the optical platform through a four-dimensional adjusting platform, and the four-dimensional adjusting platform adjusts the position of a zoom optical lens on the zoom lens fixing mechanism; the image surface adjusting assembly comprises a CCD mounting frame, a four-dimensional adjustable base, a sliding block and a guide rail control assembly for driving the sliding block to move; the CCD mounting frame is arranged on the four-dimensional adjustable base; the four-dimensional adjustable base is arranged on the sliding block; the grating ruler is used for recording the position of the CCD imaging component; the display is connected with the CCD imaging component.
Description
Technical Field
The invention relates to an image plane adjusting technology of a zoom optical system, in particular to an image plane butt joint and coaxial adjusting device and method of a full-waveband high-precision zoom optical system.
Background
At present, the commonly used zoom optical lens image plane adjustment method is to design the thickness of a spacer according to a theory, combine the difference of image definition under the change of long focus and short focus, and determine the final thickness of the spacer by continuously lapping and iterating the thickness of the spacer, thereby completing the adjustment work of the lens image plane. However, for batch lens image plane adjustment, the method has the following disadvantages:
1. in the pad repairing and researching process, the theoretical design thickness is taken as a basis, manual repairing and researching and interpretation are carried out according to the definition of an actual image, and the efficiency is low;
2. due to the particularities of the zoom optical lens (zoom camera), the final thickness needs to be determined by continually lapping the spacer and iterating. In the process of adjusting the image plane of the zoom optical lens (zoom camera), the imaging assembly needs to be repeatedly disassembled and assembled, the process has low efficiency for batch lens image plane adjustment, and the imaging assembly is easily damaged in the disassembling and assembling process;
3. when the working waveband of the zoom optical lens is not limited to the visible waveband any more and comprises an infrared/near-infrared waveband, the common visible waveband collimator cannot meet the requirement of image surface adjustment;
4. when the optical axis of the zoom optical lens and the normal of the imaging assembly are coaxially adjusted, the zoom optical lens needs to be fixed, and usually, a camera bottom plate is connected by screws to complete fastening, so that the method is easy to cause the deformation of the bottom plate and influence the coaxial adjustment precision;
5. in the image surface and coaxial adjustment process, the adjustment precision is low by adopting a mode of visual identification and manual operation.
Disclosure of Invention
The invention provides an image surface butt joint and coaxial adjusting device and method for a full-waveband high-precision zooming optical system, aiming at solving the technical problems that the efficiency of a gasket thickness determining process is low, an imaging assembly is easy to damage in a repeated assembly and disassembly process, a visible light waveband collimator cannot meet the requirement, and the image surface adjusting precision is low in the existing zooming optical lens image surface adjusting method.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an image surface butt joint and coaxial adjusting device of a full-waveband high-precision zoom optical system is characterized in that: the zoom lens comprises an optical platform, a grating ruler, a display, a light source, a full-waveband collimator, a zoom lens fixing mechanism and an image plane adjusting assembly, wherein the full-waveband collimator, the zoom lens fixing mechanism and the image plane adjusting assembly are sequentially arranged along the emergent direction of the light source;
the full-waveband collimator is arranged on the optical platform and is positioned on an emergent light path of the light source;
the zoom lens fixing mechanism is arranged on the optical platform through a four-dimensional adjusting platform, the zoom lens fixing mechanism is used for fixing the zoom optical lens to be tested, and the four-dimensional adjusting platform is used for adjusting the position of the zoom optical lens to be tested so that the optical axes of the zoom optical lens to be tested and the full-waveband collimator to be coaxial;
the image surface adjusting assembly comprises a CCD mounting frame, a four-dimensional adjustable base, a sliding block and a guide rail control assembly;
the CCD mounting rack is used for mounting the CCD imaging assembly, the CCD mounting rack is arranged on the four-dimensional adjustable base, and the four-dimensional adjustable base is used for adjusting the movement of the CCD imaging assembly in the four-dimensional direction;
the four-dimensional adjustable base is arranged on the sliding block;
the guide rail control assembly is used for driving the sliding block to axially reciprocate along the zoom optical lens to be tested;
the grating ruler is used for recording the position of the CCD imaging assembly to obtain the thickness of the trimming gasket;
the display is connected with the CCD imaging assembly and used for acquiring the pictures in the full-wave-band collimator in real time.
Furthermore, the zoom lens fixing mechanism comprises a frame body, a zoom lens mounting frame, a first adjusting screw, a first motor and two clamping blocks;
the frame body comprises two side plates which are arranged on the four-dimensional adjusting platform in parallel and a guide rod which is vertically arranged between the two side plates, and the axis of the guide rod is vertical to the axis of the full-wave-band collimator;
the zoom lens mounting rack is arranged on the four-dimensional adjusting platform, and the upper part of the zoom lens mounting rack penetrates through the guide rod;
the two clamping blocks are arranged on the guide rod and positioned on two sides of the zoom lens mounting frame;
the first adjusting screw rod penetrates through the zoom lens mounting frame and the two clamping blocks to be arranged between the two side plates, and the first adjusting screw rod is connected with the two clamping blocks through left-handed and right-handed threads respectively;
the first motor is fixed on one side plate or the four-dimensional adjusting platform, the output of the first motor is connected with one end of the first adjusting screw rod, and the first motor is used for driving the first adjusting screw rod to rotate so as to drive the two clamping blocks to move in the axial direction of the guide rod or move back to back.
Further, the guide rail control assembly comprises a second adjusting screw, a second guide rod and a second motor for driving the second adjusting screw to rotate;
the second motor is arranged on the four-dimensional adjusting platform;
one end of the second adjusting screw is connected with the output of the motor, the other end of the second adjusting screw penetrates through the sliding block to be arranged on the zoom lens mounting rack and is rotatably connected with the zoom lens mounting rack, the axis of the second adjusting screw is perpendicular to the axis of the first adjusting screw, and the zoom lens mounting rack is positioned in the middle of the guide rod;
one end of the second guide rod is fixedly connected with the second motor, the other end of the second guide rod penetrates through the sliding block to be fixedly connected with the zoom lens mounting frame, and the axis of the second guide rod is parallel to the axis of the second adjusting screw rod;
the grating ruler is arranged on the second guide rod.
Further, the zoom lens fixing mechanism further comprises a lens mounting bracket;
a through groove is formed in the upper surface of the zoom lens mounting rack along the axial direction of the second adjusting screw;
the lens mounting bracket is arranged on the through groove;
the inner sides of the two clamping blocks are provided with convex blocks used for clamping the lens mounting bracket.
Further, the guide rail control assembly further comprises a limiting block which is installed on the second adjusting screw and located between the sliding block and the zoom lens installation frame.
Furthermore, the limiting block is provided with a locking piece for fixing the limiting block.
Furthermore, the number of the guide rods is 2, and the guide rods are positioned on two sides of the first adjusting screw rod;
and a ball bearing is arranged between the clamping block and the guide rod.
Meanwhile, the invention provides a method for image surface butt joint and coaxial adjustment of a full-waveband high-precision zoom optical system, which is characterized by comprising the following steps of:
1) zoom optical system image plane adjustment
1.1) installing a zoom optical lens on a zoom lens fixing mechanism, installing a CCD imaging assembly on a CCD installation frame, and placing a resolution plate in a full-waveband collimator;
the zoom optical lens is a continuous zoom optical imaging lens;
1.2) adjusting the zoom cam to enable the initial position of the zoom optical lens to be positioned in a short-focus large view field, driving the slide block to move through the guide rail control assembly, enabling the CCD imaging assembly to be close to the focus position of the zoom optical lens until a display displays that a resolution plate in a full-waveband collimator tube shot by the zoom optical lens is clear, and recording data d of a grating ruler at the moment1；
1.3) adjusting the zoom cam to enable the zoom optical lens to reach a long-focus small visual field, and adjusting the focus cam to enable a display to clearly present a resolution board picture in a full-waveband collimator shot by the zoom optical lens at a long-focus position;
1.4) returning the zoom optical lens to a short-focus large view field, and observing an image in a display; if not clear, the guide rail control assembly drives the sliding block, so that the position of the CCD imaging assembly is changed, the image of the resolution plate in the full-waveband collimator tube for displaying the images shot by the zooming optical lens in the display is clear, and the data d of the grating ruler at the moment is recorded2；
1.5) returning the zoom optical lens to a long-focus position, and observing an image in a display; if not, adjusting the focusing cam until the display displays that the image of the resolution plate in the full-waveband collimator shot by the zooming optical lens is clear;
1.6) repeating the steps 1.2) to 1.5) until the image definition in the display is consistent all the time in the process of changing the long focus and the short focus of the zoom optical lens, and obtaining the thickness d of the gasket to be repaired in the process of adjusting the phase surface, wherein d is equal to d2–d1；
2) Change reticle
Replacing the resolution plate in the full-waveband collimator tube with a reticle;
3) zoom optical system coaxial commissioning
3.1) the zoom optical lens which finishes the image surface adjustment shoots the reticle in the full-wave-band collimator tube and displays the image of the reticle in the display;
3.2) adjusting the zoom optical lens to a short-focus large view field, and generating a reference point on a display screen, wherein the reference point is the center of a cross wire of a reticle under the large view field state of the zoom optical lens;
3.3) adjusting the zoom optical lens to a long-focus small view field, and adjusting the space position of the zoom optical lens through a four-dimensional adjusting platform to enable the center of the cross wire of the reticle in the small view field to coincide with the datum point;
3.4) returning the zoom optical lens to a short-focus large view field, observing whether the center of the cross wire of the reticle with the large view field is superposed with the reference point or not, and if so, executing the step 3.5); if the difference is not coincident, re-determining the reference point, and executing the step 3.3) until the position of the reference point is always positioned at the center of the cross wire of the differentiation plate in the process of changing the long focal length of the zoom optical lens;
3.5) the CCD imaging component generates an electric cross wire, namely the center of the CCD target surface, and the electric cross wire is displayed by a display; accurately interpreting and finely adjusting the step 3.4) by moving the CCD target surface central electric cross wire, so that the coaxial precision of the optical axis of the zooming optical system and the optical axis of the collimator is better than 2 pixels, the optical axis of the zooming optical system and the optical axis of the collimator are coaxial at the moment, and the CCD target surface central electric cross wire is reset;
and 3.6) adjusting the position of the CCD imaging component through the four-dimensional adjustable base to ensure that an electric cross wire generated at the center of the CCD target surface coincides with the center of the differentiation plate and ensure that the electric cross wire coincides with the center of the differentiation plate in the horizontal direction and the vertical direction, so that the CCD imaging component and the zooming optical lens penetrate through the center, and coaxial debugging of the image surface of the optical system is completed.
Further, in step 1.2), grating scale data d is processed1To zero, the thickness d ═ d of the shim needs to be repaired in the phase surface adjustment process in step 1.6)2。
Compared with the prior art, the invention has the advantages that:
1. the zoom lens fixing mechanism is arranged on the optical platform through the four-dimensional adjusting platform, so that the four-dimensional movement of the zoom optical lens on the zoom lens fixing mechanism can be completed; the CCD mounting frame, the four-dimensional adjustable base and the sliding block are sequentially connected, the sliding block is driven to move through the guide rail control assembly, the CCD imaging assembly on the CCD mounting frame is further driven to axially move along the zooming optical lens, the position of the CCD imaging assembly relative to the zooming optical lens is adjusted until the image definition in the display is consistent all the time in the long-and-short-focus change process of the zooming optical lens, the thickness of a gasket to be repaired and ground in the phase surface adjusting process is obtained through the moving step length of the grating ruler, and the repairing and cutting precision is high; the CCD imaging component does not need to be repeatedly disassembled and assembled in the process of adjusting the image surface of the zoom optical lens.
2. The collimator used by the adjusting device and the method is a full-waveband collimator, and can be suitable for image plane adjustment and optical axis coaxial debugging of optical lenses with various wavebands, and also suitable for multiband multi-lens coaxial debugging work.
3. The zoom lens fixing mechanism can be used for arranging a through groove on the upper surface of a zoom lens mounting frame, a zoom optical lens is arranged on the zoom lens mounting frame through a lens mounting support, two clamping blocks are driven to move through a first motor, and the lens mounting support is fixed by convex blocks on the inner sides of the two clamping blocks, so that the zoom optical lens is radially positioned. The fixing mode of the existing zoom optical lens is changed, so that the problem of insufficient image plane punching precision caused by deformation of the bottom plate is avoided.
4. According to the invention, the second adjusting screw rod can be provided with the limiting block for mechanically limiting the moving direction of the sliding block and preventing the sliding block from damaging the zoom lens mounting frame and the zoom lens in the moving process.
5. The limiting block can be provided with a locking piece, the position of the sliding block is accurately positioned by positioning the locking piece, and the precision of obtaining the thickness of the repairing and grinding gasket is improved.
6. The adjusting method comprises the steps of firstly placing a discrimination plate in a full-wave-band collimator, driving a CCD imaging assembly through a guide rail control assembly, namely obtaining the thickness of a gasket to be repaired in the phase surface adjusting process, and determining the initial position of the CCD imaging assembly; then, the resolution plate is replaced by a reticle, the spatial position of the zooming optical lens is adjusted through a four-dimensional adjusting platform, and the optical axis of the zooming optical system is coaxial with the optical axis of the collimator; and finally, precisely adjusting the position of the CCD imaging component through the four-dimensional adjustable base to finish the coaxial debugging of the image surface of the optical system.
Drawings
FIG. 1 is a schematic structural diagram of an image plane butt joint and common axis adjusting device of a full-band high-precision zoom optical system according to the present invention;
FIG. 2 is a schematic view of the full-waveband high-precision zoom optical system according to the present invention, in which a zoom lens fixing mechanism and a guide rail control assembly are mounted on an optical platform;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a schematic structural diagram of a four-dimensional adjustable base in the image plane docking and coaxial adjusting device of the full-waveband high-precision zoom optical system of the present invention;
wherein the reference numbers are as follows:
1-a light source, 2-a full-waveband collimator, 3-a zoom optical lens, 4-a zoom lens fixing mechanism, 5-a CCD mounting rack, 51-a fixing clamp, 52-a clamp locking piece, 6-a CCD imaging assembly, 7-a slide block, 8-a four-dimensional adjusting platform, 9-an optical platform, 10-a clamping block, 11-a zoom lens mounting rack, 12-a grating ruler, 13-a frame body, 14-a first adjusting screw rod, 15-a ball bearing, 16-a second adjusting screw rod, 17-a limiting block, 18-a lens mounting rack, 19-a display, 20-a side plate, 21-a guide rod, 22-a first motor, 23-a four-dimensional adjustable base, 231-a mounting platform and 232-a horizontal left-right adjusting mechanism, 233-horizontal fore-and-aft adjustment mechanism, 234-vertical direction adjustment mechanism, 235-pitch direction adjustment mechanism, 24-second motor, 25-projection.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in FIG. 1, an image plane butt joint and coaxial adjustment device of a full-waveband high-precision zoom optical system comprises an optical platform 9, a grating ruler 12, a display 19, a four-dimensional adjustment platform 8, a light source 1, a full-waveband collimator 2, a zoom lens fixing mechanism 4 and an image plane adjustment assembly, wherein the full-waveband collimator 2, the zoom lens fixing mechanism 4 and the image plane adjustment assembly are sequentially arranged on an emergent light path of the light source 1. Compared with the existing complex working process, the adjusting device has the advantages of simple structure, easy realization and convenient operation, and can be used for scientific research, production and debugging of batch products.
The full-waveband collimator 2 is arranged on the optical platform 9, and the full-waveband collimator 2 comprises the full-waveband collimator 2 provided with a division cross-hair plate and the full-waveband collimator 2 provided with a discrimination plate.
The zoom lens fixing mechanism 4 is connected with the four-dimensional adjusting platform 8, the zoom optical lens 3 fixed on the zoom lens fixing mechanism 4 can complete movement in different directions, the optical axes of the zoom optical lens 3 and the full-waveband collimator 2 are coaxial, and the movement posture which can be completed by the four-dimensional adjusting platform 8 comprises: the horizontal direction is around, the horizontal direction is left and right sides, and vertical direction height and vertical direction are rotatory.
As shown in fig. 2 and 3, the zoom lens fixing mechanism 4 includes a frame body 13, a zoom lens mounting frame 11, a first adjusting screw 14, a first motor 22, two clamping blocks 10, and a lens mounting frame 18; the frame body 13 comprises two side plates 20 arranged in parallel and guide rods 21 vertically arranged between the two side plates 20, and the number of the guide rods 21 is 2; the axis of the guide rod 21 is perpendicular to the axis of the full-wave-band collimator 2, and the two side plates 20 are arranged on the four-dimensional adjusting platform 8.
The zoom lens mounting rack 11 is arranged on the four-dimensional adjusting platform 8, is positioned between the two side plates 20, and is arranged on the guide rod 21 in a clearance fit manner at the upper part, a through groove is axially formed in the upper surface of the zoom lens mounting rack 11 along the second adjusting screw 16, the lens mounting support 18 is arranged on the through groove, the lens mounting support 18 is used for mounting the zoom optical lens 3, the zoom optical lenses 3 of different specifications use the lens mounting supports 18 of different specifications, the width of the through groove is wide enough, and the lens mounting supports 18 of different specifications and widths can be placed.
The two clamping blocks 10 are installed on the guide rod 21 in a clearance fit mode and located on two sides of the zoom lens installation frame 11, a ball bearing 15 is arranged between the clamping blocks 10 and the guide rod 21, and protruding blocks 25 used for clamping the lens installation support 18 are arranged on the inner sides (the opposite surfaces of the two clamping blocks 10) of the two clamping blocks 10.
The first adjusting screw 14 is arranged between the two side plates 20 through the zoom lens mounting bracket 11 and the two clamping blocks 10; the first adjusting screw 14 is connected with the two clamping blocks 10 through left-handed and right-handed threads respectively and is in clearance fit with the zoom lens mounting rack 11; the 2 guide rods 21 are symmetrically arranged at two sides of the first adjusting screw 14; the first motor 22 is connected with one end of the first adjusting screw 14, and under the driving of the first motor 22, the first adjusting screw 14 rotates to further drive the two clamping blocks 10 to move oppositely along the axial direction of the guide rod 21, so that the convex blocks 25 on the inner sides of the two clamping blocks 10 fasten the lens mounting bracket 18, and further complete radial fastening of the zoom optical lens 3 on the lens mounting bracket 18; when the zooming optical lens 3 needs to be disassembled or replaced, the first motor 22 drives the two clamping blocks 10 to move back and forth, the zooming optical lens 3 is disassembled, the zooming optical lens 3 with different specifications can be fixed by the zooming lens fixing mechanism 4, the assembling and disassembling process is simple and convenient, only the first motor 22 is needed to drive the first adjusting screw 14 to rotate forwards or backwards, the fixing mode of the existing zooming optical lens is changed, and therefore the problem that the center-penetrating precision of an image plane is not enough due to the deformation of the bottom plate is solved.
After the zoom lens fixing mechanism 4 is connected to the four-dimensional adjustment platform 8, the four-dimensional adjustment platform 8 is fixed to the optical platform 9.
The image surface adjusting assembly comprises a CCD mounting frame 5 for fixing the CCD imaging assembly 6, a four-dimensional adjustable base 23 for fixing the CCD mounting frame 5, a sliding block 7 for enabling the four-dimensional adjustable base 23 to move and a guide rail control assembly for driving the sliding block 7 to move axially relative to the zooming optical lens 3; CCD imaging component 6 installs on CCD mounting bracket 5, and CCD mounting bracket 5 sets up on four-dimensional adjustable base 23, sets up on slider 7 on four-dimensional adjustable base 23, and CCD imaging component 6 is located light source 1 outgoing light path.
As shown in fig. 4, the four-dimensional adjustable base 23 includes an installation platform 231, and a horizontal left-right adjusting mechanism 232, a horizontal front-back adjusting mechanism 233, a vertical direction adjusting mechanism 234, and a pitch direction adjusting mechanism 235 disposed on the installation platform, and is used for adjusting four degrees of freedom of left-right translation, front-back translation, up-down translation, and up-down pitch of the CCD imaging component 6, when the zoom optical lens completes image plane butt joint work and presents the image of the collimator differentiation plate to the display, the cross wire generated at the center of the CCD target surface of the CCD imaging component 6 coincides with the center of the differentiation plate in the collimator through the four-dimensional adjustable base 23, and simultaneously, the horizontal direction and the vertical direction of the two coincide. The CCD mounting frame 5 comprises a fixing clamp 51 and a clamp locking piece 52, the fixing clamp 51 is made of polytetrafluoroethylene, the fixing clamp 51 is arranged on the four-dimensional adjustable base 23 and located on an emergent light path of the light source, and the clamp locking piece 52 is used for locking the fixing clamp to complete the fixation of the CCD imaging component 6.
The guide rail control assembly is used for driving the sliding block 7 to axially reciprocate along the zooming optical lens 3 so as to drive the CCD imaging assembly 6 to reciprocate near the focal plane position of the zooming optical lens 3; the guide rail control assembly is arranged on the four-dimensional adjusting platform 8 and comprises a second motor 24, a second adjusting screw 16 and a second guide rod which are arranged in parallel; the second motor 24 is arranged on the four-dimensional adjusting structure; one end of the second adjusting screw 16 is connected with the output of the second motor 24, the other end of the second adjusting screw passes through the slider 7 and is arranged on the zoom lens mounting rack 11 and is rotatably connected with the zoom lens mounting rack 11, the axis of the second adjusting screw 16 is vertical to the axis of the first adjusting screw 14, and the zoom lens mounting rack 11 is positioned in the middle of the guide rod 21; one end of the second guide rod is fixedly connected with a shell of the second motor, the other end of the second guide rod penetrates through the sliding block to be fixedly connected with the zoom lens mounting rack, the grating ruler 12 is arranged on the second guide rod, the second motor 24 is used for driving the second screw rod to rotate so as to drive the sliding block 7 to axially reciprocate along the zoom optical lens 3, and the second guide rod provides guide motion for the movement of the sliding block; the grating ruler 12 is arranged on the second guide rod in parallel to the axis of the second guide rod, the grating ruler 12 is used for recording the position of the CCD imaging component 6, and the thickness of the gasket required to be repaired and ground in the phase surface adjusting process is obtained through the moving step length of the grating ruler 12.
The guide rail control assembly further comprises a limiting block 17 installed on the second adjusting screw 16 and located between the slider 7 and the zoom lens mounting frame 11, the moving direction of the slider 7 is mechanically limited, the slider 7 is prevented from being damaged by the zoom lens mounting frame 11 and the zoom lens in the moving process, a limiting locking part is arranged on the limiting block 17, a sensor is specifically arranged at the front end of the limiting block 17, the electric limiting is carried out, or the limiting part is a bolt, the limiting block 17 is fixed, and the position of the slider 7 is accurately positioned.
The display 19 is connected with the CCD imaging assembly 6 and is used for acquiring pictures in the full-wave-band collimator 2 in real time.
The adjusting device of the invention has precise matching in the assembling process, thereby ensuring that the coaxial adjusting precision of the image surface of the zoom optical system is higher.
Meanwhile, the embodiment provides a method for image plane butt joint and common axis adjustment of a full-waveband high-precision zoom optical system, which comprises the following steps:
1) zoom optical system image plane adjustment
1.1) fixing a lens to be tested on a zoom lens fixing mechanism 4, installing a CCD imaging assembly 6 on a CCD installation frame 5, and putting 3 the lens into a full-waveband collimator 2#An discrimination rate board;
the lens to be tested is a continuous zooming optical imaging lens;
1.2) adjust the zoom cam and make zoom optical lens (3) be located the big visual field of short burnt, use the picture of the big visual field of short burnt shooting as the benchmark, will install CCD imaging component 6 on CCD mounting bracket 5 and be connected with display 19, drive slider 7 through second motor 24 and remove, and then make CCD imaging component 6 be close to the focus position of camera lens along the 16 axial of second adjusting screw, make the resolution board picture clear present to display 19 in the collimator that the camera lens was shot, and through stopper 17 to slider 7 spacing fixed, record this moment grating ruler 12 data d1Meanwhile, the data of the grating ruler 12 is set to zero;
1.3) adjusting the zoom cam to enable the zoom optical lens 3 to reach a long-focus position, observing a small view field picture, and enabling the lens to shoot the collimator 3#The resolution board displays the image clearly on the display 19;
1.4) returning the zoom optical lens 3 to a short-focus large-view-field shot picture, and observing the image definition in the display 19; if not clear, the second motor 24 drives the slide block 7 to move, so that the 3 in the full-waveband collimator 2 for shooting by the lens#The discrimination board image is clearly displayed in the display 19 again, the slide block 7 is limited and fixed through the limiting block 17, and the data d of the grating ruler 12 at the moment is recorded2；
1.5) returning the zoom optical lens 3 to the telephoto position, and observing the image in the display 19; if the image is not clear, the image of the resolution plate in the full-waveband collimator 2 shot by the zooming optical lens 3 is displayed in the display 19 by adjusting the focusing cam until the image is clear;
1.6) repeatedly executing the step 1.2-1.5, and continuously recording the data d of the secondary recording2Covering the original data d1Until the image definition in the display 19 is consistent all the time in the process of changing the length and the length of the zoom optical lens 3, reading the data d of the grating ruler 12 in the guide rail control assembly at the moment2That is, the thickness of the spacer to be repaired in the image plane adjustment process. Processing a corresponding trimming gasket according to the size and thickness so as to finish the image surface adjustment work of the zoom optical lens 3;
2) change reticle
Replacing the resolution plate in the full-waveband collimator tube 2 with a reticle;
3) zoom optical system coaxial commissioning
3.1) the zoom optical lens 3 which finishes the image surface adjustment shoots the reticle in the full-wave-band collimator 2 and displays the image of the reticle in the display 19;
3.2) adjusting the zoom optical lens 3 to a short-focus large view field, and determining a reference point on a screen of the display 19, wherein the reference point is the cross wire center of the reticle in a large view field state;
3.3) adjusting the zoom optical lens 3 to a long-focus small view field, and adjusting the space position of the zoom optical lens 3 through the four-dimensional adjusting platform 8 to ensure that the center of the cross wire of the reticle in the small view field is coincided with the reference point;
3.4) returning the zoom optical lens 3 to the short-focus large view field, observing whether the center of the cross wire of the reticle in the large view field is superposed with the reference point or not, and if so, executing the step 3.5; if the difference does not coincide, re-determining the reference point, and executing the step 3.3 until the position of the reference point is always positioned at the center of the cross wire of the differentiation plate in the long-short focal change process of the zoom optical lens 3;
3.5) the CCD imaging component 6 generates an electric cross-hair, namely the center of the CCD target surface, and the electric cross-hair is displayed by the display 19. The software is used for moving the central electric cross wire of the CCD target surface, and the accurate interpretation and the accurate fine adjustment are carried out on the process of 3.4), so that the coaxial accuracy of the optical axis of the zooming optical system and the optical axis of the collimator is better than 2 pixels, the optical axis of the zooming optical system and the optical axis of the collimator are coaxial at the moment, and the central electric cross wire of the CCD target surface is reset.
3.6) adjusting the position of the CCD imaging component 6 through the four-dimensional adjustable base 23 to ensure that the electric cross hair generated at the center of the CCD target surface of the CCD imaging component 6 coincides with the center of the differentiation plate, and simultaneously ensuring that the electric cross hair coincides with the center of the differentiation plate in the horizontal direction and the vertical direction to achieve the center penetration of the CCD imaging component 6 and the zooming optical lens 3, namely finishing the coaxial debugging of the image surface of the optical system.
The coaxial adjusting device and the coaxial adjusting method are mainly used for image plane adjustment and center penetration of an aerial zoom optical system, so that the problems of insufficient precision and low efficiency in working in the prior art are solved.
The above description is only for the purpose of describing the preferred embodiments of the present invention and does not limit the technical solutions of the present invention, and any known modifications made by those skilled in the art based on the main technical concepts of the present invention fall within the technical scope of the present invention.
Claims (9)
1. The utility model provides a full wave band high accuracy zoom optical system image plane butt joint and coaxial adjusting device which characterized in that: the zoom lens system comprises an optical platform (9), a grating ruler (12), a display (19), a light source (1), a full-waveband collimator tube (2), a zoom lens fixing mechanism (4) and an image plane adjusting assembly, wherein the full-waveband collimator tube (2), the zoom lens fixing mechanism (4) and the image plane adjusting assembly are sequentially arranged along the emergent direction of the light source (1);
the full-waveband collimator tube (2) is arranged on the optical platform (9) and is positioned on an emergent light path of the light source (1);
the zoom lens fixing mechanism (4) is arranged on the optical platform (9) through a four-dimensional adjusting platform (8), the zoom lens fixing mechanism (4) is used for fixing the zoom optical lens (3) to be tested, and the four-dimensional adjusting platform (8) is used for adjusting the position of the zoom optical lens (3) to be tested, so that the optical axes of the zoom optical lens (3) to be tested and the full-waveband collimator (2) are collinear;
the image surface adjusting assembly comprises a CCD mounting rack (5), a four-dimensional adjustable base (23), a sliding block (7) and a guide rail control assembly;
the CCD mounting rack (5) is used for mounting the CCD imaging component (6), the CCD mounting rack (5) is arranged on the four-dimensional adjustable base (23), and the four-dimensional adjustable base (23) is used for adjusting the movement of the CCD imaging component (6) in the four-dimensional direction;
the four-dimensional adjustable base (23) is arranged on the sliding block (7);
the guide rail control assembly is used for driving the sliding block (7) to axially reciprocate along the zoom optical lens (3) to be tested;
the grating ruler (12) is used for recording the position of the CCD imaging component (6) to obtain the thickness of the trimming gasket;
the display (19) is connected with the CCD imaging component (6) and is used for acquiring pictures in the full-wave-band collimator (2) in real time.
2. The image plane butt joint and common axis adjusting device of the full-waveband high-precision zoom optical system according to claim 1, wherein: the zoom lens fixing mechanism (4) comprises a frame body (13), a zoom lens mounting frame (11), a first adjusting screw (14), a first motor (22) and two clamping blocks (10);
the frame body (13) comprises two side plates (20) which are arranged on the four-dimensional adjusting platform (8) in parallel and a guide rod (21) which is vertically arranged between the two side plates (20), and the axis of the guide rod (21) is vertical to the axis of the full-wave-band collimator (2);
the zoom lens mounting rack (11) is arranged on the four-dimensional adjusting platform (8), and the upper part of the zoom lens mounting rack is arranged on the guide rod (21) in a penetrating manner;
the two clamping blocks (10) are arranged on the guide rod (21) and are positioned on two sides of the zoom lens mounting rack (11);
the first adjusting screw (14) penetrates through the zoom lens mounting frame (11) and the two clamping blocks (10) and is arranged between the two side plates (20), and the first adjusting screw (14) is in threaded connection with the two clamping blocks (10) in a left-handed mode and a right-handed mode respectively;
the first motor (22) is fixed on one side plate (20) or the four-dimensional adjusting platform (8), the output of the first motor is connected with one end of the first adjusting screw rod (14) and used for driving the first adjusting screw rod (14) to rotate, and then the two clamping blocks (10) are driven to axially move in opposite directions or move back to back along the guide rod (21).
3. The image plane butt joint and common axis adjusting device of the full-waveband high-precision zoom optical system according to claim 2, wherein: the guide rail control assembly comprises a second adjusting screw (16), a second guide rod and a second motor (24) for driving the second adjusting screw (16) to rotate;
the second motor (24) is arranged on the four-dimensional adjusting platform (8); one end of the second adjusting screw (16) is in output connection with the second motor (24), the other end of the second adjusting screw penetrates through the sliding block (7) and is arranged on the zoom lens mounting rack (11) and is rotatably connected with the zoom lens mounting rack (11), the axis of the second adjusting screw (16) is perpendicular to the axis of the first adjusting screw (14), and the zoom lens mounting rack (11) is located in the middle of the guide rod (21);
one end of the second guide rod is fixedly connected with the second motor, the other end of the second guide rod penetrates through the sliding block to be fixedly connected with the zoom lens mounting rack (11), and the axis of the second guide rod is parallel to the axis of the second adjusting screw rod (16);
the grating ruler (12) is arranged on the second guide rod.
4. The image plane butt joint and common axis adjusting device of the full-waveband high-precision zoom optical system according to claim 3, wherein: the zoom lens fixing mechanism (4) further comprises a lens mounting bracket (18);
a through groove is formed in the upper surface of the zoom lens mounting rack (11) along the axial direction of the second adjusting screw (16);
the lens mounting bracket (18) is arranged on the through groove;
the inner sides of the two clamping blocks (10) are provided with convex blocks (25) for clamping the lens mounting bracket (18).
5. The image plane docking and common axis adjusting device of the full-band high-precision zoom optical system according to claim 4, wherein: the guide rail control assembly further comprises a limiting block (17) which is arranged on the second adjusting screw (16) and is located between the sliding block (7) and the zoom lens mounting rack (11).
6. The image plane butt joint and common axis adjusting device of the full-waveband high-precision zoom optical system according to claim 5, wherein: the limiting block (17) is provided with a locking piece for fixing the limiting block (17).
7. The image plane butt joint and common axis adjusting device of the full-waveband high-precision zoom optical system according to claim 6, wherein: the number of the guide rods (21) is 2, and the guide rods are positioned on two sides of the first adjusting screw rod (14);
and a ball bearing (15) is arranged between the clamping block (10) and the guide rod (21).
8. An image surface butt joint and common axis adjusting method for a full-waveband high-precision zoom optical system is characterized by comprising the following steps:
1) zoom optical system image plane adjustment
1.1) installing a zoom optical lens (3) on a zoom lens fixing mechanism (4), installing a CCD imaging assembly (6) on a CCD installation frame (5), and placing a resolution plate in a full-waveband collimator (2);
wherein, the zoom optical lens (3) is a continuous zoom optical imaging lens;
1.2) adjusting the zoom cam to enable the initial position of the zoom optical lens (3) to be located in a short-focus large view field, driving the sliding block (7) to move through the guide rail control assembly, enabling the CCD imaging assembly (6) to be close to the focus position of the zoom optical lens (3) until a display (19) displays that a resolution plate in a full-waveband collimator tube (2) shot by the zoom optical lens (3) is clear in picture, and recording data d of a grating ruler (12) at the moment1；
1.3) adjusting a zooming cam to enable the zooming optical lens (3) to reach a long-focus small view field, and adjusting the focusing cam to enable a display (19) to clearly present a resolution board picture in a full-waveband collimator (2) shot by the zooming optical lens (3) at a long-focus position;
1.4) returning the zoom optical lens (3) to a short-focus large view field and observing an image in a display (19); the slide block (7) is driven by the guide rail control assembly, so that the position of the CCD imaging assembly (6) is changed, the discrimination board picture in the full-waveband collimator tube (2) shot by the zoom optical lens (3) in the display (19) is clear, and the data d of the grating ruler (12) at the moment is recorded2；
1.5) returning the zoom optical lens (3) to a telephoto position, and observing an image in a display (19); if the picture is not clear, the picture of the resolution plate in the full-waveband collimator tube (2) shot by the zoom optical lens (3) is displayed in the display (19) by adjusting the focusing cam until the picture is clear;
1.6) repeating steps 1.2) to 1.5) until the image definition in the display (19) is consistent all the time in the process of changing the length and the length of the zoom optical lens (3), and obtaining the thickness d of the gasket required to be repaired in the process of adjusting the phase plane, wherein d is equal to d2–d1；
2) Change reticle
The discrimination plate in the full-wave-band collimator (2) is replaced by a reticle;
3) zoom optical system coaxial commissioning
3.1) the zoom optical lens (3) which finishes the image surface adjustment shoots the reticle in the all-band collimator tube (2) and presents the image of the reticle to the display (19);
3.2) adjusting the zoom optical lens (3) to a short-focus large view field, and generating a reference point on a screen of a display (19), wherein the reference point is the center of a cross wire of a reticle under the large view field state of the zoom optical lens (3);
3.3) adjusting the zoom optical lens (3) to a long-focus small view field, and adjusting the space position of the zoom optical lens (3) through a four-dimensional adjusting platform (8) to enable the center of the cross wire of the reticle in the small view field to coincide with the reference point;
3.4) returning the zoom optical lens (3) to a short-focus large view field, observing whether the center of the cross wire of the reticle with the large view field is superposed with the reference point or not, and if so, executing the step 3.5); if the difference is not coincident, the reference point is determined again, and the step 3.3) is executed until the position of the reference point is always positioned at the center of the cross wire of the differentiation plate in the process of changing the long focus and the short focus of the zoom optical lens (3);
3.5) the CCD imaging component (6) generates an electric cross wire, namely the center of the CCD target surface, and the electric cross wire is displayed by a display (19); accurately interpreting and finely adjusting the step 3.4) by moving the CCD target surface central electric cross wire, so that the coaxial precision of the optical axis of the zooming optical system and the optical axis of the collimator is better than 2 pixels, the optical axis of the zooming optical system and the optical axis of the collimator are coaxial at the moment, and the CCD target surface central electric cross wire is reset;
3.6) adjusting the position of the CCD imaging component (6) through the four-dimensional adjustable base (23), so that the electric cross hair generated at the center of the CCD target surface of the CCD imaging component (6) coincides with the center of the differentiation plate, and the coincidence of the CCD target surface and the differentiation plate in the horizontal direction and the vertical direction is ensured, thereby achieving the penetration of the CCD imaging component (6) and the zooming optical lens (3), and completing the coaxial debugging of the image surface of the optical system.
9. The image plane docking and common axis adjusting method of the full-band high-precision zoom optical system according to claim 8, characterized in that: step (ii) of1.2), the data d of the grating ruler (12)1To zero, the thickness d ═ d of the shim needs to be repaired in the phase surface adjustment process in step 1.6)2。
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Effective date of registration: 20230904 Address after: Room 403, Building 2, Changling Industrial Park, No. 901, West Section of Biyuan 1st Road, High tech Zone, Xi'an City, Shaanxi Province, 710065 Patentee after: Xi'an zhongkexi optical Photoelectric Technology Co.,Ltd. Address before: 710119, No. 17, information Avenue, new industrial park, hi tech Zone, Shaanxi, Xi'an Patentee before: XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS OF CAS |