CN111458896B - Full-band high-precision zoom optical system image surface interfacing and coaxial adjusting method - Google Patents
Full-band high-precision zoom optical system image surface interfacing and coaxial adjusting method Download PDFInfo
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Abstract
The invention provides a full-band high-precision zoom optical system image surface connection and coaxial adjustment device and method, which solve the problems of low efficiency, easy damage of an imaging component and low image surface adjustment precision of the conventional zoom optical lens image surface adjustment method. The device comprises an optical platform, a grating ruler, a display, a light source, a full-wave-band collimator, a zoom lens fixing mechanism and an image plane adjusting assembly, wherein the full-wave-band 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-band 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 the zoom optical lens on the zoom lens fixing mechanism; the image plane 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 zooming optical system, in particular to an image plane connecting and coaxial adjusting device and method of a full-band high-precision zooming optical system.
Background
At present, the common image surface adjusting method of the zoom optical lens is to firstly design the thickness of a gasket according to theory, combine the difference of image definition under the change of long and short focal lengths, and determine the thickness of a final gasket by continuously repairing, grinding and iterating the thickness of the gasket so as to finish the image surface adjusting work of the lens. However, for batch lens image plane adjustment, the method has the following disadvantages:
1. the pad repairing and grinding process is based on theoretical design thickness, and manual repairing and grinding and interpretation are carried out according to actual image definition, so that the efficiency is low;
2. because of the particularities of zoom optical lenses (zoom cameras), the final thickness needs to be determined by constant lapping and iteration. In the process of adjusting the image plane of a zoom optical lens (zoom camera), the imaging component needs to be repeatedly disassembled and assembled, the process has lower efficiency for adjusting the image planes of batch lenses, and the imaging component is easy to damage in the process of disassembling and assembling;
3. when the working wave band of the zoom optical lens is not limited to the visible light wave band, and the infrared/near infrared wave band is contained, the conventional visible light wave band collimator cannot meet the requirement of image plane adjustment;
4. when the optical axis of the zoom optical lens and the normal line of the imaging component are coaxially adjusted, the zoom optical lens needs to be fixed, and the fixation is usually completed by connecting a camera bottom plate by adopting a screw;
5. the image plane and coaxial adjustment process adopts a mode of naked eye identification and manual operation, so that the adjustment precision is lower.
Disclosure of Invention
The invention provides a full-band high-precision zoom optical system image surface and coaxial adjusting device and method, which are used for solving the technical problems that the existing zoom optical lens image surface adjusting method is low in efficiency in a spacer thickness determining process, an imaging component is easy to damage in a repeated dismounting process, a visible light band collimator cannot meet requirements and the image surface adjusting precision is low.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the full-band high-precision zooming optical system image surface connection and coaxial adjusting device is characterized in that: the device comprises an optical platform, a grating ruler, a display, a light source, a full-wave-band collimator, a zoom lens fixing mechanism and an image plane adjusting assembly, wherein the full-wave-band collimator, the zoom lens fixing mechanism and the image plane adjusting assembly are sequentially arranged along the emergent direction of the light source;
the all-band 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, and is used for fixing the zoom optical lens to be tested;
the image plane adjusting assembly comprises a CCD mounting frame, a four-dimensional adjustable base, a sliding block and a guide rail control assembly;
the CCD mounting frame is used for mounting the CCD imaging assembly, and is arranged on a four-dimensional adjustable base which is used for adjusting the movement of the CCD imaging assembly in four-dimensional directions;
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 component and obtaining the thickness of the trimming gasket;
the display is connected with the CCD imaging component and is used for acquiring pictures in the full-band collimator in real time.
Further, 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 arranged on the four-dimensional adjustment platform in parallel and a guide rod 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 frame is arranged on the four-dimensional adjustment platform, and the upper part of the zoom lens mounting frame is arranged on the guide rod in a penetrating way;
the two clamping blocks are arranged on the guide rod and are positioned on two sides of the zoom lens mounting frame;
the first adjusting screw rod passes through the zoom lens mounting frame and the two clamping blocks and is arranged between the two side plates, and the first adjusting screw rod is respectively connected with the two clamping blocks in a left-handed thread and a right-handed thread;
the first motor is fixed on a side plate or a four-dimensional adjusting platform, the output of the first motor is connected with one end of a first adjusting screw rod and is used for driving the first adjusting screw rod to rotate, and then the two clamping blocks are driven to move in opposite directions or in opposite directions along the axial direction of the guide rod.
Further, the guide rail control assembly comprises a second adjusting screw rod, a second guide rod and a second motor for driving the second adjusting screw rod to rotate;
the second motor is arranged on the four-dimensional adjustment 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 and is arranged on the zoom lens mounting frame and is rotatably connected with the zoom lens mounting frame, the axis of the second adjusting screw is perpendicular to the axis of the first adjusting screw, and the zoom lens mounting frame 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 passes through the sliding block and is 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;
the grating ruler is arranged on the second guide rod.
Further, the zoom lens fixing mechanism further includes a lens mounting bracket;
the upper surface of the zoom lens mounting frame is axially provided with a through groove along the second adjusting screw rod;
the lens mounting bracket is arranged on the through groove;
the inner sides of the two clamping blocks are provided with protruding blocks for clamping the lens mounting bracket.
Further, the guide rail control assembly further comprises a limiting block which is arranged on the second adjusting screw and located between the sliding block and the zoom lens mounting frame.
Further, a locking piece for fixing the limiting block is arranged on the limiting block.
Further, the number of the guide rods is 2, and the guide rods are positioned at 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 full-band high-precision zoom optical system image surface connection and coaxial adjustment method, which is characterized by comprising the following steps of:
1) Image plane adjustment for zoom optical system
1.1 A zoom optical lens is arranged on a zoom lens fixing mechanism, a CCD imaging component is arranged on a CCD mounting frame, and an identification rate plate is arranged in a full-band collimator;
wherein 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 located in a short-focus large view field, driving the sliding block to move through the guide rail control assembly to enable the CCD imaging assembly to be close to the focal position of the zoom optical lens until the discrimination rate plate in the full-band collimator shot by the zoom optical lens is displayed in the display to be clear, and recording the grating ruler data d at the moment 1 ；
1.3 Adjusting the zoom cam to enable the zoom optical lens to be in a long-focus small view field, and enabling the display to clearly display an identification rate plate picture in the full-band collimator shot by the zoom optical lens at a long-focus position by adjusting the focusing cam;
1.4 Returning the zoom optical lens to the short focus large view field to observe the image in the display; if the image is not clear, the guide rail control assembly drives the sliding block, so that the position of the CCD imaging assembly is changed, the discrimination plate picture in the full-band collimator shot by the zoom optical lens is displayed in the display, the image of the discrimination plate is clear, and the data d of the grating ruler is recorded at the moment 2 ；
1.5 Returning the zoom optical lens to the tele position to observe an image in the display; if not, adjusting the focusing cam until the discrimination plate picture in the all-band collimator shot by the zoom optical lens is displayed in the display;
1.6 Repeating the steps 1.2) to 1.5) until the image definition in the display is consistent throughout the process of changing the long and short focal lengths of the zoom optical lens, and obtaining the thickness d of the gasket required to be polished in the phase surface adjustment process, wherein d=d 2 –d 1 ；
2) Replacement reticle
Replacing the discrimination rate plate in the full-band collimator with a reticle;
3) Zoom optical system coaxial commissioning
3.1 The zoom optical lens with the image surface adjusted shoots the reticle in the all-band collimator, and displays the reticle picture to 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 reticle cross wire in 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 a reticle cross wire of the small view field to coincide with the datum point;
3.4 Returning the zoom optical lens to the short-focus large view field, observing whether the center of the reticle cross hair of the large view field is coincident with the datum point or not, and executing the step 3.5 if the center of the reticle cross hair of the large view field is coincident with the datum point; if the two different types of the standard points do not coincide, the standard points are determined again, and the step 3.3) is executed until the positions of the standard points are always positioned at the center of the cross wire of the differentiating plate in the long and short focal length changing process of the zoom optical lens;
3.5 The CCD imaging component generates an electric cross wire which is the center of the CCD target surface and is presented by a display; the step 3.4) is accurately interpreted and finely adjusted by moving the CCD target surface center 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, and at the moment, the optical axis of the zooming optical system and the optical axis of the collimator are coaxial, and the CCD target surface center electric cross wire is reset;
3.6 The position of the CCD imaging component is adjusted through the four-dimensional adjustable base, so that an electric cross wire generated at the center of the CCD target surface is overlapped with the center of the differentiation plate, and the horizontal direction and the vertical direction of the electric cross wire are overlapped, so that the penetration of the CCD imaging component and the zoom optical lens is achieved, and the coaxial debugging of the image surface of the optical system is completed.
Further, in step 1.2), the grating ruler data d 1 To zero, the thickness d=d of the pad is polished in the phase surface adjustment process in step 1.6) 2 。
Compared with the prior art, the invention has the advantages that:
1. according to the adjusting device and the adjusting method, the zoom lens fixing mechanism is arranged on the optical platform through the four-dimensional adjusting platform, so that 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 driven to axially move along the zoom optical lens, the position of the CCD imaging assembly relative to the zoom optical lens is adjusted until the image definition in the display is consistent all the time in the process of changing the long and short focuses of the zoom optical lens, the thickness of a shim to be repaired and ground in the process of adjusting the phase surface is obtained through the moving step length of the grating ruler, and the repairing and cutting precision is high; and the CCD imaging component is not required to be repeatedly disassembled and assembled in the image plane adjustment process of the zooming optical lens.
2. The collimator used by the adjusting device and the method is a full-band collimator, can be suitable for adjusting the image plane of the optical lens with various bands and coaxially debugging the optical axis, and is also suitable for coaxially debugging the multiband multi-lens.
3. According to the zoom lens fixing mechanism, the through groove can be formed in the upper surface of the zoom lens mounting frame, the zoom optical lens is arranged on the zoom lens mounting frame through the lens mounting frame, the first motor drives the two clamping blocks to move, the convex blocks on the inner sides of the two clamping blocks are used for fixing the lens mounting frame, and further radial positioning of the zoom optical lens is achieved. The fixing mode of the existing zoom optical lens is changed, so that the problem of insufficient image plane penetration precision caused by deformation of a bottom plate is avoided.
4. The limiting block can be arranged on the second adjusting screw rod and used for mechanically limiting the moving direction of the sliding block, so that the damage to the zoom lens mounting frame and the zoom lens in the moving process of the sliding block is prevented.
5. According to the invention, the locking piece can be arranged on the limiting block, and the position of the sliding block is accurately positioned by positioning the locking piece, so that the accuracy of obtaining the thickness of the repairing and grinding gasket is improved.
6. Firstly, an identification rate plate is placed in a full-wave-band collimator, a CCD imaging assembly is driven by a guide rail control assembly, namely, the thickness of a gasket to be polished in the phase surface adjustment process is obtained, and the preliminary position of the CCD imaging assembly is determined; then, the discrimination rate plate is replaced by a reticle, and the space position of the zoom optical lens is adjusted through a four-dimensional adjustment platform, so that the optical axis of the zoom optical system is coaxial with the optical axis of the collimator; and finally, the position of the CCD imaging component is finely adjusted through the four-dimensional adjustable base, so that the coaxial adjustment of the image plane of the optical system is finished.
Drawings
FIG. 1 is a schematic view of an image plane and coaxial adjusting device of a full-band high-precision zoom optical system according to the present invention;
FIG. 2 is a schematic view of the invention in which a zoom lens fixing mechanism and a guide rail control assembly are mounted on an optical platform in an image surface interfacing and coaxial adjusting device of an all-band high-precision zoom optical system;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a schematic view of a four-dimensional adjustable base in an image surface interfacing and coaxial adjusting device of a full-band high-precision zoom optical system according to the present invention;
wherein, the reference numerals are as follows:
the device comprises a 1-light source, a 2-full-wave collimator, a 3-zoom optical lens, a 4-zoom lens fixing mechanism, a 5-CCD mounting frame, a 51-fixing clamp, a 52-clamp locking piece, a 6-CCD imaging component, a 7-slider, an 8-four-dimensional adjusting platform, a 9-optical platform, a 10-clamping block, a 11-zoom lens mounting frame, a 12-grating ruler, a 13-frame body, a 14-first adjusting screw, a 15-ball bearing, a 16-second adjusting screw, a 17-limiting block, a 18-lens mounting bracket, a 19-display, a 20-side plate, a 21-guide rod, a 22-first motor, a 23-four-dimensional adjustable base, a 231-mounting platform, a 232-horizontal left-right adjusting mechanism, a 233-horizontal front-back adjusting mechanism, a 234-vertical adjusting mechanism, a 235-pitching direction adjusting mechanism, a 24-second motor and a 25-bump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an image surface connection and coaxial adjustment device of a full-band 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, and a full-band collimator 2, a zoom lens fixing mechanism 4 and an image surface adjustment assembly which are sequentially arranged on an outgoing light path of the light source 1. Compared with the existing complicated working process, the adjusting device has the advantages of simple structure, easiness in implementation and convenience in operation, and can be used for scientific research production debugging of batch products.
The full-band collimator 2 is mounted on the optical platform 9, and the full-band collimator 2 includes the full-band collimator 2 mounted with the reticle and the full-band collimator 2 mounted with the discrimination plate.
The zoom lens fixing mechanism 4 is connected with the four-dimensional adjustment platform 8, so that 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-band collimator 2 are coaxial, and the movement gesture which can be completed by the four-dimensional adjustment platform 8 comprises: the horizontal direction rotates back and forth, left and right in the horizontal direction, and high and low in the vertical direction and rotates in the vertical direction.
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, a lens mounting bracket 18; the frame 13 comprises two side plates 20 arranged in parallel and guide rods 21 vertically arranged between the two side plates 20, wherein the number of the guide rods 21 is 2 arranged in parallel; the axis of the guide rod 21 is perpendicular to the axis of the full-band collimator 2, and two side plates 20 are provided on the four-dimensional adjustment platform 8.
The zoom lens mounting frame 11 is arranged on the four-dimensional adjustment platform 8, is positioned between the two side plates 20, is matched with the upper gap and is arranged on the guide rod 21 in a penetrating way, the upper surface of the zoom lens mounting frame 11 is axially provided with a through groove along the second adjusting screw 16, the lens mounting bracket 18 is arranged on the through groove, the lens mounting bracket 18 is used for mounting the zoom optical lens 3, the zoom optical lenses 3 with different specifications use the lens mounting brackets 18 with different specifications, the width of the through groove is wide enough, and the lens mounting brackets 18 with different specifications can be placed.
The two clamping blocks 10 are mounted on the guide rod 21 in a clearance fit manner and are positioned on two sides of the zoom lens mounting frame 11, a ball bearing 15 is arranged between the clamping blocks 10 and the guide rod 21, and protruding blocks 25 for clamping the lens mounting frame 18 are arranged on the inner sides (opposite surfaces of the two clamping blocks 10) of the two clamping blocks 10.
The first adjusting screw 14 is disposed between the two side plates 20 through the zoom lens mount 11 and the two clamping blocks 10; the first adjusting screw 14 is connected with the two clamping blocks 10 by left-handed threads and right-handed threads respectively and is in clearance fit with the zoom lens mounting frame 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 the first adjusting screw 14 rotates under the drive of the first motor 22, so that the two clamping blocks 10 are driven to move in opposite directions along the axial direction of the guide rod 21, the convex blocks 25 on the inner sides of the two clamping blocks 10 fasten the lens mounting bracket 18, and the zoom optical lens 3 on the lens mounting bracket 18 is fastened radially; when the zoom optical lens 3 needs to be disassembled or replaced, the two clamping blocks 10 are driven to move back to back through the first motor 22, the zoom optical lens 3 is disassembled, the zoom optical lens 3 with different specifications can be fixed by the zoom lens fixing mechanism 4 of the embodiment, the assembly and disassembly processes are simple and convenient, and only the first motor 22 is required to drive the first adjusting screw 14 to rotate forwards or reversely, so that the fixing mode of the existing zoom optical lens is changed, and the problem of insufficient image plane penetration precision caused by bottom plate deformation is avoided.
After the zoom lens fixing mechanism 4 is connected with the four-dimensional adjustment platform 8, the four-dimensional adjustment platform 8 is fixed with the optical platform 9.
The image plane 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 axially move relative to the zoom optical lens 3; the CCD imaging component 6 is arranged on the CCD mounting frame 5, the CCD mounting frame 5 is arranged on the four-dimensional adjustable base 23, the four-dimensional adjustable base 23 is arranged on the sliding block 7, and the CCD imaging component 6 is positioned on the emergent light path of the light source 1.
As shown in fig. 4, the four-dimensional adjustable base 23 includes a mounting platform 231, a horizontal left-right adjustment mechanism 232, a horizontal front-rear adjustment mechanism 233, a vertical direction adjustment mechanism 234, and a pitching direction adjustment mechanism 235, which are disposed on the mounting platform, and are used for adjusting four degrees of freedom of left-right translation, front-rear translation, up-down translation, and up-down pitching of the CCD imaging assembly 6. The CCD mounting frame 5 comprises a fixing clamp 51 and a clamp locking piece 52, wherein the fixing clamp 51 is made of polytetrafluoroethylene, the fixing clamp 51 is arranged on the four-dimensional adjustable base 23 and is positioned on an emergent light path of the light source, and the clamp locking piece 52 is used for locking the fixing clamp to finish the fixing of the CCD imaging component 6.
The guide rail control assembly is used for driving the sliding block 7 to axially reciprocate along the zoom optical lens 3 so as to drive the CCD imaging assembly 6 to reciprocate near the focal plane position of the zoom optical lens 3; the guide rail control assembly is arranged on the four-dimensional adjustment 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 adjustment structure; 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 passes through the sliding block 7 and is arranged on the zoom lens mounting frame 11 and is in rotatable connection with the zoom lens mounting frame 11, the axis of the second adjusting screw 16 is perpendicular to the axis of the first adjusting screw 14, and at the moment, the zoom lens mounting frame 11 is positioned in the middle of the guide rod 21; one end of a second guide rod is fixedly connected with the shell of the second motor, the other end of the second guide rod penetrates through the sliding block and is fixedly connected with the zoom lens mounting frame, 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, and further the sliding block 7 is driven 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 which needs to be polished 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 arranged on the second adjusting screw 16 and located between the sliding block 7 and the zoom lens mounting frame 11, and is used for mechanically limiting the moving direction of the sliding block 7 and preventing the damage to the zoom lens mounting frame 11 and the zoom lens in the moving process of the sliding block 7, a locking piece used for limiting is arranged on the limiting block 17, specifically, a sensor is arranged at the front end of the limiting block 17, electric limiting is performed, or the limiting piece is a bolt, and the position of the sliding block 7 is accurately positioned by fixing the limiting block 17.
The display 19 is connected with the CCD imaging assembly 6 for acquiring pictures in the full-band collimator 2 in real time.
The adjusting device is precisely matched in the assembling process, so that the coaxial adjusting precision of the image plane of the zooming optical system is higher.
Meanwhile, the embodiment provides a full-band high-precision zoom optical system image surface interfacing and coaxial adjusting method, which comprises the following steps:
1) Image plane adjustment for zoom optical system
1.1 Fixing the lens to be tested on the zoom lens fixing mechanism 4, mounting the CCD imaging component 6 on the CCD mounting frame 5, and placing 3 in the full-band collimator 2 # An authentication rate board;
the lens to be tested is a continuous zooming optical imaging lens;
1.2 Adjusting the zoom cam to enable the zoom optical lens (3) to be positioned in a short-focus large view field, taking a picture shot by the short-focus large view field as a reference, connecting a CCD imaging component 6 which is installed on a CCD mounting frame 5 with a display 19, driving a sliding block 7 to move through a second motor 24, further enabling the CCD imaging component 6 to axially approach to the focal point position of the lens along a second adjusting screw 16, enabling a picture of an identification rate plate in a collimator shot by the lens to be clearly displayed in the display 19, limiting and fixing the sliding block 7 through a limiting block 17, and recording the number of grating rulers 12 at the momentAccording to d 1 Simultaneously, 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 the long focal position, observing a small view field picture, and enabling the lens to shoot 3 in the collimator tube by adjusting the focusing cam # The discrimination rate board picture is clearly presented to the display 19;
1.4 Returning the zoom optical lens 3 to the picture shot by the short-focus large-view field to observe the image definition in the display 19; if the image is unclear, the second motor 24 drives the sliding block 7 to move so as to enable the lens to shoot the 3 in the full-wave-band collimator 2 # The discrimination rate plate picture is clearly displayed in the display 19 again, the sliding block 7 is limited and fixed through the limiting block 17, and the data d of the grating ruler 12 at the moment is recorded 2 ；
1.5 Returning the zoom optical lens 3 to the tele position to observe the image in the display 19; if not, the focusing cam is adjusted until the discrimination rate plate picture in the full-band collimator 2 shot by the zoom optical lens 3 is displayed in the display 19;
1.6 Repeating the steps 1.2-1.5 to continuously record the data d of the secondary record 2 Overlay of raw data d 1 The image definition in the display 19 is consistent all the time until the zoom optical lens 3 changes the long and short focus, and the data d of the grating ruler 12 in the guide rail control assembly is read out 2 The thickness of the pad is required to be polished in the image plane adjustment process. Processing corresponding trimming gaskets according to the thickness of the size, thereby completing the image plane adjustment work of the zoom optical lens 3;
2) Replacement reticle
The discrimination rate plate in the full-band collimator 2 is replaced by a reticle;
3) Zoom optical system coaxial commissioning
3.1 The zoom optical lens 3 with the image plane adjusted shoots the reticle in the full-band collimator 2 and presents the reticle picture to the display 19;
3.2 Adjusting the zoom optical lens 3 to a short focus large view field, and determining a datum point on a screen of the display 19, wherein the datum point is a reticle cross wire center 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 a four-dimensional adjusting platform 8 to enable the center of a reticle cross wire of the small view field to coincide with a datum point;
3.4 Returning the zoom optical lens 3 to the short-focus large-view field, observing whether the center of the reticle cross hair of the large-view field is coincident with the datum point or not, and if so, executing the step 3.5; if the two different points do not coincide, the datum point is determined again, and the step 3.3 is executed until the position of the datum point is always positioned at the center of the dividing plate cross wire in the process of changing the long and short focal lengths of the zoom optical lens 3;
3.5 The CCD imaging assembly 6 generates an electrical cross wire, i.e. the center of the CCD target surface, and is presented by a display 19. And (3) accurately judging and finely adjusting the 3.4) process by moving the CCD target surface center electric cross wire through software, 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, and at the moment, the optical axis of the zooming optical system and the optical axis of the collimator are coaxial, and the CCD target surface center electric cross wire is reset.
3.6 The position of the CCD imaging component 6 is adjusted through the four-dimensional adjustable base 23, so that an electric cross wire generated at the center of a CCD target surface of the CCD imaging component 6 coincides with the center of the differentiation plate, and the horizontal direction and the vertical direction of the electric cross wire coincide with each other, and the penetration of the CCD imaging component 6 and the zoom optical lens 3 is achieved, namely the coaxial debugging of an optical system image surface is completed.
The coaxial adjusting device and the coaxial adjusting method are mainly used for adjusting the image plane and penetrating the center of the aviation zoom optical system so as to solve the problems of insufficient precision and low efficiency in operation in the prior art.
The foregoing description of the preferred embodiments of the present invention is merely illustrative, and the technical solution of the present invention is not limited thereto, and any known modifications may be made by those skilled in the art based on the main technical concept of the present invention, which falls within the technical scope of the present invention.
Claims (8)
1. An image surface connection and coaxial adjustment method of a full-band high-precision zooming optical system is characterized by comprising the following steps of: the adjusting device comprises an optical platform (9), a grating ruler (12), a display (19), a light source (1), a full-band collimator (2), a zoom lens fixing mechanism (4) and an image plane adjusting component, wherein the full-band collimator (2), the zoom lens fixing mechanism (4) and the image plane adjusting component are sequentially arranged along the emergent direction of the light source (1);
the full-wave-band collimator (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 the 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-band collimator (2) are collinear;
the image plane adjusting assembly comprises a CCD mounting frame (5), a four-dimensional adjustable base (23), a sliding block (7) and a guide rail control assembly;
the CCD mounting frame (5) is used for mounting the CCD imaging component (6), the CCD mounting frame (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 four-dimensional directions;
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) and obtaining 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-band collimator (2) in real time;
the adjusting method comprises the following steps:
1) Image plane adjustment for zoom optical system
1.1 A zoom optical lens (3) is arranged on a zoom lens fixing mechanism (4), a CCD imaging component (6) is arranged on a CCD mounting frame (5), and an identification rate plate is arranged in a full-band 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 to enable the CCD imaging assembly (6) to be close to the focus position of the zoom optical lens (3) until the discrimination rate plate picture in the full-band collimator (2) shot by the zoom optical lens (3) is displayed in the display (19) is clear, and recording data d of the grating ruler (12) at the moment 1 ；
1.3 Adjusting the zoom cam to enable the zoom optical lens (3) to reach a long-focus small view field, and enabling the display (19) to clearly display an identification rate plate picture in the full-band collimator (2) shot by the zoom optical lens (3) at a long-focus position by adjusting the focusing cam;
1.4 Returning the zoom optical lens (3) to the short focus large view field to observe the image in the 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 rate plate picture in the full-band collimator (2) shot by the zoom optical lens (3) is displayed in the display (19) to be clear, and the data d of the grating ruler (12) is recorded at the moment 2 ；
1.5 Returning the zoom optical lens (3) to the tele position for viewing the image in the display (19); if not, the focusing cam is adjusted until the discrimination plate picture in the full-band collimator (2) shot by the zoom optical lens (3) is displayed in the display (19) to be clear;
1.6 Repeating the steps 1.2) to 1.5) until the image definition in the display (19) is consistent in the process of changing the long and short focuses of the zoom optical lens (3), and obtaining the thickness d of the gasket required to be polished in the phase surface adjustment process, wherein d=d 2 –d 1 ；
2) Replacement reticle
The discrimination rate plate in the full-band collimator (2) is replaced by a reticle;
3) Zoom optical system coaxial commissioning
3.1 The zoom optical lens (3) with the image plane adjusted shoots the reticle in the full-band collimator (2) and displays the reticle picture into 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 a reticle cross wire center in a 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 reticle cross wire center of the small view field to coincide with the datum point;
3.4 Returning the zoom optical lens (3) to the short-focus large-view field, observing whether the center of the reticle cross hair of the large-view field is coincident with the datum point or not, and if so, executing the step 3.5); if the two different points do not coincide, the datum point is determined again, and the step 3.3) is executed until the position of the datum point is always positioned at the center of the dividing plate cross wire in the process of changing the long and short focal lengths of the zoom optical lens (3);
3.5 The CCD imaging component (6) generates an electric cross wire which is the center of the CCD target surface and is presented by a display (19); the step 3.4) is accurately interpreted and finely adjusted by moving the CCD target surface center 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, and at the moment, the optical axis of the zooming optical system and the optical axis of the collimator are coaxial, and the CCD target surface center electric cross wire is reset;
3.6 The position of the CCD imaging component (6) is adjusted through the four-dimensional adjustable base (23), so that an electric cross wire generated at the center of a CCD target surface of the CCD imaging component (6) is overlapped with the center of the differentiation plate, and the horizontal direction and the vertical direction of the electric cross wire are overlapped, so that the penetration of the CCD imaging component (6) and the zoom optical lens (3) is achieved, and the coaxial debugging of the image surface of the optical system is completed.
2. The full-band high-precision zoom optical system image surface interfacing and coaxial adjusting method 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 adjustment 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 frame (11) is arranged on the four-dimensional adjustment platform (8), and the upper part of the zoom lens mounting frame is arranged on the guide rod (21) in a penetrating way;
the two clamping blocks (10) are arranged on the guide rod (21) and are positioned on two sides of the zoom lens mounting frame (11);
the first adjusting screw (14) passes 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 respectively in threaded connection with the two clamping blocks (10) in a left-handed and a right-handed way;
the first motor (22) is fixed on one side plate (20) or the four-dimensional adjusting platform (8), and the output of the first motor is connected with one end of the first adjusting screw (14) and is used for driving the first adjusting screw (14) to rotate so as to drive the two clamping blocks (10) to move in opposite directions or in opposite directions along the axial direction of the guide rod (21).
3. The full-band high-precision zoom optical system image surface interfacing and coaxial adjusting method 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 adjustment platform (8); 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 sliding block (7) and is arranged on the zoom lens mounting frame (11) and is rotatably connected with the zoom lens mounting frame (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 frame (11) is positioned 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 passes through the sliding block and is fixedly connected with the zoom lens mounting frame (11), and the axis of the second guide rod is parallel to the axis of the second adjusting screw (16);
the grating ruler (12) is arranged on the second guide rod.
4. The full-band high-precision zoom optical system image surface interfacing and coaxial adjusting method according to claim 3, wherein: the zoom lens fixing mechanism (4) further comprises a lens mounting bracket (18);
the upper surface of the zoom lens mounting frame (11) is axially provided with a through groove along 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 protruding blocks (25) for clamping the lens mounting bracket (18).
5. The method for adjusting the image plane alignment and the coaxial alignment 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 positioned between the sliding block (7) and the zoom lens mounting frame (11).
6. The method for adjusting the image plane alignment and the coaxial alignment of the full-band 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 method for adjusting the image plane alignment and the coaxial alignment of the full-band 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 at two sides of the first adjusting screw rod (14);
a ball bearing (15) is arranged between the clamping block (10) and the guide rod (21).
8. The method for adjusting the image plane alignment and the coaxial alignment of the full-band high-precision zoom optical system according to claim 7, wherein: in step 1.2), the data d of the grating ruler (12) is recorded 1 To zero, the thickness d=d of the pad is polished 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 |