A miniaturized continuous zoom mechanical structure

Abstract

The present invention belongs to the field of optoelectronic technology, and specifically relates to a miniaturized continuous zoom mechanical structure to solve the technical problems of traditional continuous zoom systems, such as large size, small zoom ratio, low resolution, and incompatibility with high-precision cameras. The present invention comprises a housing, a front component optical system, and a rear component continuous zoom system; the front component optical system is composed of an off-axis two-mirror optical system composed of a primary mirror mounted on the fifth side panel of the housing and a secondary mirror mounted on the second side panel of the housing, which are arranged in sequence along the optical path, forming a front telescope for magnification, which can compress the focal length of the target system and the aperture of the incident light beam; the rear component continuous zoom system is located on the output optical path of the secondary mirror and is arranged between the second and fourth side panels of the housing, and comprises a support frame fixed to the bottom panel of the housing, a front fixing group, a zoom compensation group, a rear fixing group, and a detector fixed to the support frame and arranged in sequence along the optical path, for providing a continuous zoom function.

Description

Technical Field

[0001] The present invention belongs to the field of optoelectronic technology and relates to a continuous zoom mechanical structure, in particular to a miniaturized continuous zoom mechanical structure. Background Art

[0002] With the continuous development of science and technology, the detection system of optoelectronic equipment is required to be small in size, light in weight, with a large detection distance and high clarity. It should be able to observe continuously under climatic conditions such as fog, rain, snow and dust. It should be able to conduct panoramic searches of targets in large areas with a small magnification, and to conduct magnified observations of targets in small areas with a large magnification.

[0003] A continuous zoom system changes the focal length of the entire system by moving two or more lens groups within the system. While maintaining the image plane unchanged, the focal length can be increased or decreased by pushing, pulling, or rotating the zoom ring, ensuring a continuous, clear image throughout the zoom process. Without changing lenses, the focal length can be continuously varied within the focal range, enabling diverse composition. However, traditional continuous zoom systems generally suffer from large size, small zoom ratios, low resolution, and are not compatible with high-precision cameras. Summary of the Invention

[0004] The main purpose of the present invention is to solve the technical problems of traditional continuous zoom systems such as large size, small zoom ratio, low resolution and incompatibility with high-precision cameras, and to provide a miniaturized continuous zoom mechanical structure.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A miniaturized continuous zoom mechanical structure, which is special in that it includes a box, a front component optical system and a rear component continuous zoom system;

[0007] The box body includes a first side panel, a second side panel, a third side panel, a fourth side panel, a fifth side panel, a sixth side panel, a top panel and a bottom panel;

[0008] The front component optical system includes a primary mirror mounted on the fifth side plate and a secondary mirror mounted on the second side plate; the primary mirror and the secondary mirror are arranged in sequence along the optical path to form an off-axis two-mirror optical system, and the secondary mirror is located behind the primary image plane of the primary mirror and is used to convert the converged light beam into parallel light;

[0009] The rear component continuous zoom system is located on the output light path of the secondary mirror and is arranged between the second side plate and the fourth side plate, and includes a support frame fixed to the bottom plate of the box body, a front fixing group, a zoom compensation group, a rear fixing group and a detector fixed to the support frame and arranged in sequence along the light path;

[0010] The front fixed group is arranged at the front end of the support frame, and includes a focusing drive group, a front fixed lens barrel, and a focusing lens group arranged in the front fixed lens barrel; the focusing lens group reciprocates along the axial direction of the front fixed lens barrel under the drive of the focusing drive group;

[0011] The zoom and compensating lens group includes a zoom drive group, a straight groove barrel fixedly connected to the rear end of the front fixed lens barrel, a zoom lens group and a compensating lens group sequentially arranged in the straight groove barrel; the zoom lens group and the compensating lens group are driven by the zoom drive group to reciprocate along the axial direction of the straight groove barrel, and the movement directions of the zoom lens group and the compensating lens group are opposite;

[0012] The rear fixing group includes a rear fixing lens barrel fixedly connected to the rear end of the straight groove barrel and a rear fixing lens group fixedly installed on the inner side wall of the rear fixing lens barrel;

[0013] The detector is fixed at the rear end of the support frame and is arranged close to the rear fixing group.

[0014] Furthermore, the front component optical system also includes a primary mirror mount fixed on the fifth side plate and a primary mirror trimming pad installed between the primary mirror mount and the fifth side plate, and the primary mirror is installed on the fifth side plate through the primary mirror mount and the primary mirror trimming pad.

[0015] Furthermore, the front component optical system also includes a secondary mirror mount fixed on the second side panel, a lateral adjustment gasket and a vertical adjustment gasket installed between the secondary mirror mount and the second side panel, and the secondary mirror is installed on the second side panel through the secondary mirror mount lateral adjustment gasket and the vertical adjustment gasket.

[0016] Furthermore, the focus drive group includes a focus moving cylinder coaxially sleeved on the inner side of the front fixed lens barrel, a focus cam cylinder coaxially sleeved on the outer side of the front fixed lens barrel, a first motor fixedly mounted on the support frame, and a first drive pin;

[0017] The focusing lens group is fixedly mounted on the inner side wall of the focusing movable cylinder;

[0018] The focusing cam barrel is provided with a first large gear ring along the circumference of the outer surface, and the first gear installed at the output end of the first motor is meshed with the first large gear ring;

[0019] The side wall of the focusing cam barrel is provided with a first oblique groove;

[0020] The side wall of the front fixed lens barrel is correspondingly provided with a first straight groove;

[0021] The first driving pin passes through the corresponding first oblique slot and first straight slot in sequence and is fixedly connected to the focusing movable cylinder.

[0022] Furthermore, the zoom drive group includes a zoom slide coaxially sleeved on the inner side of the straight groove cylinder, a compensation slide, a zoom compensation cam cylinder coaxially sleeved on the outer side of the straight groove cylinder, a second motor fixedly mounted on the support frame, a second driving pin, and a third driving pin;

[0023] The zoom lens group is fixedly mounted on the inner side wall of the zoom slide;

[0024] The compensation mirror group is fixedly mounted on the inner side wall of the compensation slide;

[0025] The variable power compensation cam cylinder is provided with a second large gear ring along the circumference of the outer surface, and the second gear installed at the output end of the second motor is meshed with the second large gear ring;

[0026] The side wall of the zoom compensation cam barrel is provided with a second oblique groove and a third oblique groove in opposite directions corresponding to the positions of the zoom lens group and the compensation lens group, and the second oblique groove and the third oblique groove are in a normally distributed state;

[0027] The side wall of the straight groove cylinder is correspondingly provided with a second straight groove and a third straight groove;

[0028] The second driving pin passes through the corresponding second oblique slot and second straight slot in sequence and is fixedly connected to the zoom lens assembly;

[0029] The third driving pin passes through the corresponding third oblique groove and the third straight groove in sequence and is fixedly connected to the compensation mirror assembly.

[0030] Furthermore, each lens of the focusing lens group, the variable magnification lens group, the compensating lens group and the rear fixed lens group is provided with a separate centering frame.

[0031] Furthermore, each lens of the focusing lens group, the variable magnification lens group, the compensating lens group and the rear fixed lens group is provided with a trimming spacer in front and behind.

[0032] Furthermore, the focus drive group also includes a first limit switch installed on the support frame and a first blocking piece provided on the focus cam barrel and cooperating with the first limit switch.

[0033] Furthermore, the zoom drive group also includes a second limit switch mounted on the support frame and a second blocking piece provided on the zoom compensation cam barrel and cooperating with the second limit switch.

[0034] Furthermore, the outer surface of the detector is treated with an anti-radiation coating, and the inner surface is treated with a conductive coating.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides a miniaturized continuous zoom mechanical structure. The front optical system comprises a primary mirror mounted on the fifth side panel of the housing and a secondary mirror mounted on the second side panel, forming an off-axis two-mirror optical system. This system converts a converged light beam into parallel light, forming a magnifying front telescope that can compress the focal length of the target system and the aperture of the incident light beam. The rear continuous zoom system is positioned behind the secondary mirror to provide a continuous zoom function. The combination of the off-axis two-mirror optical system, consisting of the primary and secondary mirrors of the front optical system, and the rear continuous zoom system enables the present invention to achieve continuous zoom with a large zoom ratio, a large field of view, and a long focal length while occupying a relatively small space, thereby obtaining high-quality observation images. The present invention has the characteristics of a compact structure and high cost-effectiveness, and has good market application prospects.

[0037] 2. The present invention provides a miniaturized continuous zoom mechanical structure. When performing target monitoring, one device of the present invention can replace the functions of two or more devices under different mission requirements of traditional monitoring and tracking systems, reducing the satellite's spatial size and payload weight, thereby reducing the satellite's development cost and improving the reliability of satellite detection.

[0038] 3. The present invention provides a miniaturized continuous zoom mechanical structure. Since the primary mirror and secondary mirror of the front component optical system are not coaxial, the obstruction problem of the card-type coaxial optical system is effectively avoided, and no obstruction can be achieved, thereby enhancing the detection capability of the system.

[0039] 4. The present invention provides a miniaturized continuous zoom mechanical structure. During the design of the support structure of the primary mirror of the front component optical system, the influence of ambient temperature and assembly stress on the surface shape of the reflector is taken into consideration. The primary mirror of the off-axis two-mirror optical system is fixed to the box through a primary mirror seat and a primary mirror trimming pad, thereby ensuring the surface accuracy of the primary mirror.

[0040] 5. The present invention provides a miniaturized continuous zoom mechanical structure, in which the secondary mirror of the off-axis two-mirror optical system is fixed to the box through a secondary mirror mount, a lateral adjustment gasket, and a vertical adjustment gasket. This not only ensures the surface accuracy of the secondary mirror, but also allows the axial distance and relative angle between the primary mirror and the secondary mirror to be adjusted by adjusting the lateral adjustment gasket and the vertical adjustment gasket to ensure that the primary mirror and the secondary mirror have precise spatial positions.

[0041] 6. The present invention provides a miniaturized continuous zoom mechanical structure, in which each lens of the focusing lens group, the variable magnification lens group, the compensating lens group and the rear fixed lens group of the rear component continuous zoom system is provided with a separate centering frame, and adopts a centering assembly structure to ensure the reliability of the lens group in high and low temperature and vibration environments and the imaging accuracy of the entire zoom system.

[0042] 7. The present invention provides a miniaturized continuous zoom mechanical structure, which converts the rotational motion of the focusing cam barrel into reciprocating motion of the focusing lens group through the first driving pin through the matching relationship between the first driving pin, the first oblique groove and the first straight groove, thereby not only achieving high-precision focusing, but also making the structure of the zoom system more compact and more stable.

[0043] 8. The present invention provides a miniaturized continuous zoom mechanical structure, which converts the rotational motion of the zoom and compensation cam barrel into a translational motion that makes the zoom and compensation lens groups move in opposite directions through the matching relationship between the second driving pin, the second writing slot, the second straight slot and the zoom lens group, as well as the matching relationship between the third driving pin, the third oblique slot, the third straight slot and the compensation lens group. This not only improves the consistency accuracy of the visual axis of the television system during the continuous zoom process, but also makes the structure simpler, effectively improving the stability of the system.

[0044] 9. The present invention provides a miniaturized continuous zoom mechanical structure, in which each lens of the focusing lens group, the magnification lens group, the compensating lens group and the rear fixed lens group of the rear component continuous zoom system is provided with a trimming spacer in front and behind. The trimming spacer is used to adjust the axial spacing of each lens and the axial spacing between them and other structures as a whole, thereby ensuring the spacing requirements between the optical lenses.

[0045] 10. The present invention provides a miniaturized continuous zoom mechanical structure, in which the outer surface of the detector is treated with an anti-radiation coating and the inner surface is treated with a conductive coating to ensure that the lap resistance meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of a miniaturized continuous zoom mechanical structure of the present invention (the top plate of the box is not shown);

[0047] Figure 2 This is a schematic structural diagram of an embodiment of a miniaturized continuous zoom mechanical structure of the present invention (the top plate and the third side plate of the box are not shown);

[0048] Figure 3 This is a schematic structural diagram of another embodiment of a miniaturized continuous zoom mechanical structure of the present invention (the top plate and the third side plate of the box are not shown);

[0049] Figure 4 Schematic diagram of the structure of the rear component continuous zoom system in an embodiment of the present invention (the lower half of the support frame is not shown);

[0050] Figure 5 Schematic diagram of the structure of the rear-element continuous zoom system in another direction according to an embodiment of the present invention (the lower half of the support frame is not shown);

[0051] Figure 62 is a diagram showing the internal structure of the rear component continuous zoom system in an embodiment of the present invention.

[0052] The following are the descriptions of the reference numerals:

[0053] 1-box, 101-first side panel, 102-second side panel, 103-third side panel, 104-fourth side panel, 105-fifth side panel, 106-sixth side panel;

[0054] 2-primary mirror; 3-secondary mirror; 4-support frame;

[0055] 5-front fixed group, 501-front fixed lens barrel, 502-focusing lens group, 503-focusing movable barrel, 504-focusing cam barrel, 505-first motor, 506-first large ring gear, 507-first inclined slot, 508-first limit switch, 509-first baffle;

[0056] 6 - magnification compensation group, 601 - straight groove cylinder, 602 - magnification lens group, 603 - compensation lens group, 604 - magnification slide, 605 - compensation slide, 606 - magnification compensation cam cylinder, 607 - second motor, 608 - second large ring gear, 609 - second inclined slot, 610 - third inclined slot, 611 - second limit switch, 612 - second baffle;

[0057] 7-rear fixed group, 701-rear fixed lens barrel, 702-rear fixed lens group;

[0058] 8-detector; 9-primary mirror mount; 10-primary mirror trimming pad; 11-secondary mirror mount; 12-lateral adjustment gasket; 13-vertical adjustment gasket. DETAILED DESCRIPTION

[0059] To make the above-mentioned purposes, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the technical solution of the present invention, other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0060] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0061] Furthermore, in the description of the present invention, it should be noted that the terms "inner" and "outer" and other references to orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Unless otherwise specified or limited, the terms "mounted, connected, and connected" in this disclosure should be understood broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0063] A miniaturized continuous zoom mechanical structure comprises a box 1, a front component optical system and a rear component continuous zoom system.

[0064] like Figure 1 As shown, the box body 1 includes a first side panel 101, a second side panel 102, a third side panel 103, a fourth side panel 104, a fifth side panel 105, a sixth side panel 106, a top panel and a bottom panel; in order to meet the requirements of the optical system in this embodiment, the angle between the first side panel 101 and the second side panel 102 is 163°, the angle between the second side panel 102 and the third side panel 103 is 162°, the angle between the third side panel 103 and the fourth side panel 104 is 90°, the angle between the fourth side panel 104 and the fifth side panel 105 is 107°, the angle between the fifth side panel 105 and the sixth side panel 106 is 108°, and the angle between the sixth side panel 106 and the first side panel 101 is 90°.

[0065] like Figure 2 、 Figure 3As shown, the front component optical system includes a primary mirror mount 9 fixed to the fifth side plate 105, a primary mirror 2 mounted on the primary mirror mount 9, a primary mirror trimming pad 10 mounted between the primary mirror mount 9 and the fifth side plate 105, a secondary mirror mount 11 fixed to the second side plate 102, a secondary mirror 3 mounted on the secondary mirror mount 11, and a lateral adjustment gasket 12 and a vertical adjustment gasket 13 mounted between the secondary mirror mount 11 and the second side plate 102. The primary mirror 2 and the secondary mirror 3 are arranged sequentially along the optical path to form an off-axis two-mirror optical system. The optical axis of the primary mirror 2 is located 120 mm off-center on the primary optical axis and rotated 18° counterclockwise around the optical axis. The secondary mirror 3 is located 33 mm off-center below the primary optical axis and rotated 17° counterclockwise around the optical axis. The secondary mirror 3 is located behind the primary image plane of the primary mirror 2 and is used to convert the converged light beam into parallel light, forming a magnifying front telescope that can compress the focal length of the target system and the aperture of the incident light beam.

[0066] like Figure 3-Figure 6 As shown, the rear component continuous zoom system is located on the output light path of the secondary mirror 3, and is arranged between the second side plate 102 and the fourth side plate 104, including a support frame 4 fixed on the bottom plate of the box 1, a front fixed group 5 fixed on the support frame 4 and arranged in sequence along the light path, a magnification compensation group 6, a rear fixed group 7, and a detector 8.

[0067] The front fixed group 5 is arranged at the front end of the support frame 4, including a focusing drive group, a front fixed lens barrel 501 and a focusing lens group 502 arranged in the front fixed lens barrel 501; the focusing lens group 502 reciprocates along the axial direction of the front fixed lens barrel 501 under the drive of the focusing drive group.

[0068] The zoom and compensating group 6 includes a zoom drive group, a straight groove cylinder 601 fixedly connected to the rear end of the front fixed lens barrel 501, a zoom lens group 602 and a compensating lens group 603 sequentially arranged in the straight groove cylinder 601; the zoom lens group 602 and the compensating lens group 603 are driven by the zoom drive group to reciprocate along the axial direction of the straight groove cylinder 601, and the movement directions of the zoom lens group 602 and the compensating lens group 603 are opposite.

[0069] The rear fixing group 7 includes a rear fixing lens barrel 701 fixedly connected to the rear end of the straight groove barrel 601 and a rear fixing lens group 702 installed on the inner side wall of the rear fixing lens barrel 701 .

[0070] The detector 8 is fixed to the rear end of the support frame 4 and is arranged near the rear fixing group 7 to receive the optical signal. When designing the focal plane detector of the spatial continuous zoom system, in addition to considering the installation of the circuit board, it is necessary to uniformly consider the low-pressure use environment such as impact vibration, lap resistance, EMC, etc. The detector 8 of the present invention is designed, laid out and installed separately, and full consideration is given to the structural form to meet the requirements of the low-pressure use environment and mechanical experiments; in addition, the outer surface of the detector 8 is treated with an anti-radiation coating, and the inner surface is treated with a conductive treatment to ensure that the lap resistance meets the design requirements.

[0071] It can be seen from the basic structure that compared with the existing continuous zoom system, the present invention forms an off-axis two-mirror optical system through the main mirror installed on the fifth side panel of the box body by the front component optical system and the secondary mirror installed on the second side panel of the box body, which converts the converged light beam into parallel light, forming a front telescope for magnification, which can compress the focal length of the target system and the aperture of the incident light beam; the rear component continuous zoom system is arranged behind the secondary mirror to provide a continuous zoom function; the combination of the front component optical system and the rear component continuous zoom system can enable the present invention to achieve the continuous zoom function of large magnification ratio, large field of view and long focal length while occupying a smaller space volume, thereby obtaining high-quality observation images.

[0072] In order to make the structures of the main components such as the primary mirror 2 and the secondary mirror 3 of the front optical system and the focus drive group and the zoom drive group of the rear continuous zoom system more reasonable, the specific structures of the above components adopted in the present invention are as follows:

[0073] During the structural design of the front-element optical system, the complex aerospace environment and drastic temperature changes were taken into consideration. The thermal stress caused by the mismatch in linear expansion coefficients between the primary mirror 2, the secondary mirror 3, and the supporting structure would seriously reduce the surface accuracy of the primary mirror 2 and the secondary mirror 3, resulting in a decline in the imaging quality of the system. Therefore, in the design of the supporting structure of the primary mirror 2 and the secondary mirror 3, the influence of ambient temperature and assembly stress on the surface shape of the reflector was taken into consideration. The primary mirror seat 9 and the primary mirror trimming pad 10, the secondary mirror seat 11, the lateral adjustment gasket 12, and the vertical adjustment gasket 13 were designed to serve as the supporting structures of the primary mirror 2 and the secondary mirror 3, respectively. After optical processing and coating, the primary mirror 2 and the secondary mirror 3 are fixed to the supporting structure. Then, the primary mirror 2 assembly and the secondary mirror 3 assembly are installed on the housing 1, and it is ensured that the primary mirror 2 and the secondary mirror 3 meet the tolerance requirements of the optical system design.

[0074] When the front component optical system is working: the designed primary mirror seat 9 and primary mirror trimming pad 10, secondary mirror seat 11, lateral adjustment gasket 12 and vertical adjustment gasket 13 not only ensure the surface accuracy of the primary mirror 2 and the secondary mirror 3, but also can adjust the axial distance and relative angle between the primary mirror 2 and the secondary mirror 3 by adjusting the lateral adjustment gasket 12 and the vertical adjustment gasket 13 to ensure that the primary mirror 2 installed on the fifth side plate 105 of the box body 1 and the secondary mirror 3 installed on the fifth side plate 105 of the box body 1 have precise spatial positions; a front telescope for magnification is formed by the primary mirror 2 and the secondary mirror 3 to compress the focal length of the target system and the aperture of the incident light beam to reduce the focal length and aperture of the rear component continuous zoom system.

[0075] The focusing drive group of the rear component continuous zoom system includes a focusing movable barrel 503 coaxially sleeved in the front fixed barrel 501, a focusing cam barrel 504 coaxially sleeved outside the front fixed barrel 501, a first motor 505 fixedly mounted on the support frame 4, a first limit switch 508 mounted on the support frame 4 and a first driving pin. The focusing lens group 502 is fixedly mounted on the inner side wall of the focusing movable barrel 503; the focusing cam barrel 504 is provided with a first large gear ring 506 along the circumference of the outer surface, and the first gear installed at the output end of the above-mentioned first motor 505 is engaged with the first large gear ring 506; the side wall of the focusing cam barrel 504 is provided with two first oblique grooves 507; the side wall of the front fixed lens barrel 501 is correspondingly provided with two first straight grooves; the first driving pin passes through the corresponding first oblique groove 507 and the first straight groove in sequence and is fixedly connected to the focusing movable barrel 503; a first baffle 509 is provided on the focusing cam barrel 504, and the above-mentioned first limit switch 508 cooperates with the first baffle 509 to realize the on and off of the first limit switch 508.

[0076] The zoom drive group of the rear-element continuous zoom system includes a zoom slide 604 coaxially sleeved on the inside of the straight groove cylinder 601, a compensation slide 605, a zoom compensation cam cylinder 606 coaxially sleeved on the outside of the straight groove cylinder 601, a second motor 607 fixedly mounted on the support frame 4, a second limit switch 611 mounted on the support frame 4, a second drive pin, and a third drive pin. The zoom lens group 602 is fixedly mounted on the inner wall of the zoom slide 604, and the compensation lens group 603 is fixedly mounted on the inner wall of the compensation slide 605; the zoom compensation cam cylinder 606 is provided with a second large gear ring 608 along the circumference of the outer surface, and the second gear mounted on the output end of the second motor 607 is meshed with the second large gear ring 608; the side wall of the zoom compensation cam cylinder 606 is provided with two second inclined slots 609 and a third inclined slot 610, and the second inclined slots 609 and the third inclined slots 610 are normal. Distribution state; two second straight grooves and a third straight groove are correspondingly opened on the side wall of the straight groove cylinder 601; the second driving nail passes through the corresponding second oblique groove 609 and the second straight groove in sequence and is fixedly connected to the magnification lens group 602, and the third driving nail passes through the corresponding third oblique groove 610 and the third straight groove in sequence and is fixedly connected to the compensation lens group 603; a second baffle 612 is provided on the magnification compensation cam cylinder 606, and the above-mentioned second limit switch 611 cooperates with the second baffle 612 to realize the on and off of the second limit switch 611.

[0077] When the rear element continuous zoom system is working:

[0078] The first gear at the output end of the first motor 505 of the focus drive assembly drives the first large ring gear 506 to rotate, thereby driving the focus cam barrel 504 to rotate about the central axis of the front fixed barrel 501. The focus movable barrel 503, connected to the first drive pin, drives the focus lens group 502 to perform axial reciprocating motion to achieve the purpose of focusing. During this process, the first drive pin slides within the front fixed barrel 501 through the first straight slot, limiting the degree of freedom in one circumferential direction. The focus movable barrel 503 performs axial reciprocating linear motion in a shaft-hole matching manner, with the hole and shaft clearance matching to limit the degree of freedom in four directions. The first limit switch 508 and the first baffle 509 cooperate to realize the on and off of the first limit switch 508, used to detect the initial position of the focus adjustment part, ultimately achieving automatic focusing.

[0079] On the other hand, the second gear on the second motor 607 of the magnification drive group drives the second large gear ring 608 to rotate, thereby driving the magnification compensation cam barrel 606 to rotate around the central axis of the straight groove barrel 601. The magnification slide 604 connected to the second drive pin drives the magnification lens group 602 to perform axial reciprocating motion, and the compensation slide 605 connected to the third drive pin drives the compensation lens group 603 to perform axial reciprocating motion in the opposite direction of the magnification slide 604. Since the front end of the zoom lens group 602 is connected to the front fixed group 5 and the rear end of the compensation lens group 603 is connected to the rear fixed group 7, when the zoom lens group 602 moves linearly with the zoom slide 604, the closer the zoom slide 604 is to the focusing lens group 502 of the front fixed group 5, the smaller the magnification of the camera, and vice versa; the compensation lens group 603 and the compensation slide 605 compensate each image point of different focal lengths to the rear fixed lens group 702; the rear fixed lens group 702 is only used to lengthen the rear pitch of the optical system so that the image point falls on the CCD image plane. During the process, the second driving pin and the third driving pin slide in the straight groove cylinder 601 through the second straight groove and the third straight groove, limiting the degree of freedom in one circumferential direction; the magnification slide 604 and the compensation slide 605 make axial reciprocating linear motion in a shaft-hole matching manner, and the hole and shaft clearance match to limit the degree of freedom in four directions; the second limit switch 611 and the second baffle 612 cooperate to realize the on and off of the second limit switch 611, which is used to detect the initial position of the magnification compensation cam cylinder 606, thereby realizing continuous switching between large, medium and small fields of view.

[0080] The focusing lens group 502, the variable magnification lens group 602, the compensating lens group 603, and the rear fixed lens group 702 of the rear component continuous zoom system all have multiple lenses, and all are collimated and centered to ensure consistency with the central axis of the straight groove barrel 601. Each lens is designed with a separate centering frame and assembled using separate centering processing, ensuring the reliability of the lens group in high and low temperature and vibration environments and the imaging accuracy of the entire zoom system. Each lens is equipped with trimming spacers in front and behind. These trimming spacers adjust the axial spacing between the individual lenses and the axial spacing between them and other structures, ensuring the required optical spacing between the lenses. The first, second, and third drive pins are each divided into two groups to ensure the smooth operation of the drive system.

[0081] In this embodiment, because the front optical system compresses the focal length and aperture of the target system, the focal length of the rear continuous zoom system is approximately 1 / 4 of that of the target system. Therefore, the rear continuous zoom system structure is approximately 1 / 4 of the traditional optical structure. However, because the front optical system structure protrudes a certain distance in front of the transmission optical system, under the same focal length, aperture, and zoom ratio, the miniaturized continuous zoom mechanical structure provided by this embodiment is only 1 / 3 the volume of a traditional continuous zoom optical system, effectively compressing the optical system structure and achieving miniaturization of the entire system. Because the miniaturized continuous zoom mechanical structure provided by the present invention can achieve continuous zoom functions with a large zoom ratio, a large field of view, and a long focal length while occupying a relatively small space, thereby obtaining high-quality observation images, it has the characteristics of a compact structure and high cost-effectiveness, and therefore has good market application prospects.

Claims

1. A miniaturized continuous zoom mechanical structure, characterized by: It comprises a box (1), a front component optical system and a rear component continuous zoom system; The box body (1) comprises a first side plate (101), a second side plate (102), a third side plate (103), a fourth side plate (104), a fifth side plate (105), a sixth side plate (106), a top plate and a bottom plate; The front component optical system comprises a primary mirror (2) mounted on the fifth side plate (105) and a secondary mirror (3) mounted on the second side plate (102); the primary mirror (2) and the secondary mirror (3) are sequentially arranged along the optical path to form an off-axis two-mirror optical system, the optical axis of the primary mirror (2) is located 120 mm off-center on the main optical axis, the primary mirror (2) is rotated 18° counterclockwise around the optical axis, the secondary mirror (3) is located 33 mm off-center below the main optical axis, the secondary mirror (3) is rotated 17° counterclockwise around the optical axis, and the secondary mirror (3) is located behind the primary image plane of the primary mirror (2) and is used to convert the converged light beam into parallel light; The rear component continuous zoom system is located on the output light path of the secondary mirror (3), and is arranged between the second side plate (102) and the fourth side plate (104), and comprises a support frame (4) fixed on the bottom plate of the box (1), a front fixing group (5) fixed on the support frame (4) and arranged in sequence along the light path, a zoom compensation group (6), a rear fixing group (7) and a detector (8); The front fixed group (5) is arranged at the front end of the support frame (4), and comprises a focusing drive group, a front fixed lens barrel (501), and a focusing lens group (502) arranged in the front fixed lens barrel (501); the focusing lens group (502) is driven by the focusing drive group to reciprocate along the axial direction of the front fixed lens barrel (501); The zoom and compensating group (6) comprises a zoom driving group, a straight groove barrel (601) fixedly connected to the rear end of the front fixed barrel (501), a zoom lens group (602) and a compensating lens group (603) sequentially arranged in the straight groove barrel (601); the zoom lens group (602) and the compensating lens group (603) are driven by the zoom driving group to reciprocate along the axial direction of the straight groove barrel (601), and the movement directions of the zoom lens group (602) and the compensating lens group (603) are opposite; The rear fixed group (7) comprises a rear fixed lens barrel (701) fixedly connected to the rear end of the straight groove barrel (601) and a rear fixed lens group (702) fixedly mounted on the inner side wall of the rear fixed lens barrel (701); The detector (8) is fixed to the rear end of the support frame (4) and is arranged close to the rear fixing group (7).

2. The miniaturized continuous zoom mechanical structure according to claim 1, characterized in that: The front component optical system further comprises a primary mirror seat (9) fixed on the fifth side plate (105) and a primary mirror trimming pad (10) installed between the primary mirror seat (9) and the fifth side plate (105); the primary mirror (2) is installed on the fifth side plate (105) via the primary mirror seat (9) and the primary mirror trimming pad (10).

3. The miniaturized continuous zoom mechanical structure according to claim 2, characterized in that: The front component optical system further comprises a secondary mirror mount (11) fixed on the second side plate (102), a lateral adjustment gasket (12) and a vertical adjustment gasket (13) installed between the secondary mirror mount (11) and the second side plate (102), and the secondary mirror (3) is installed on the second side plate (102) via the lateral adjustment gasket (12) and the vertical adjustment gasket (13) of the secondary mirror mount (11).

4. The miniaturized continuous zoom mechanical structure according to claim 3, characterized in that: The focus drive group comprises a focus moving cylinder (503) coaxially sleeved on the inner side of the front fixed lens barrel (501), a focus cam cylinder (504) coaxially sleeved on the outer side of the front fixed lens barrel (501), a first motor (505) fixedly mounted on the support frame (4), and a first drive pin; The focusing lens group (502) is fixedly mounted on the inner side wall of the focusing movable cylinder (503); The focusing cam barrel (504) is provided with a first large gear ring (506) along the circumference of the outer surface, and a first gear installed at the output end of the first motor (505) is meshed with the first large gear ring (506); A first inclined groove (507) is formed on the side wall of the focusing cam barrel (504); A first straight groove is correspondingly formed on the side wall of the front fixed lens barrel (501); The first driving pin passes through the corresponding first oblique slot (507) and the first straight slot in sequence and is then fixedly connected to the focusing movable cylinder (503).

5. The miniaturized continuous zoom mechanical structure according to claim 4, characterized in that: The variable power drive group comprises a variable power slide (604) coaxially sleeved on the inner side of the straight groove cylinder (601), a compensation slide (605), a variable power compensation cam cylinder (606) coaxially sleeved on the outer side of the straight groove cylinder (601), a second motor (607) fixedly mounted on the support frame (4), a second driving pin, and a third driving pin; The zoom lens group (602) is fixedly mounted on the inner side wall of the zoom slide (604); The compensation mirror group (603) is fixedly mounted on the inner side wall of the compensation slide (605); The variable power compensation cam cylinder (606) is provided with a second large gear ring (608) along the circumference of the outer surface, and a second gear installed at the output end of the second motor (607) is meshed with the second large gear ring (608); The side wall of the variable magnification compensation cam barrel (606) is respectively provided with a second oblique groove (609) and a third oblique groove (610) in opposite directions at the positions of the magnification lens group (602) and the compensation lens group (603), and the second oblique groove (609) and the third oblique groove (610) are in a normally distributed state; The side wall of the straight groove cylinder (601) is correspondingly provided with a second straight groove and a third straight groove; The second driving pin passes through the corresponding second oblique slot (609) and the second straight slot in sequence and is then fixedly connected to the zoom lens assembly (602); The third driving pin passes through the corresponding third oblique slot (610) and the third straight slot in sequence and is then fixedly connected to the compensation mirror assembly (603).

6. The miniaturized continuous zoom mechanical structure according to claim 5, characterized in that: Each lens of the focusing lens group (502), the variable magnification lens group (602), the compensating lens group (603) and the rear fixed lens group (702) is provided with a separate centering frame.

7. The miniaturized continuous zoom mechanical structure according to claim 6, characterized in that: Each lens of the focusing lens group (502), the variable magnification lens group (602), the compensating lens group (603) and the rear fixed lens group (702) is provided with a trimming spacer at the front and rear.

8. The miniaturized continuous zoom mechanical structure according to claim 7, characterized in that: The focus drive group further comprises a first limit switch (508) mounted on the support frame (4) and a first blocking piece (509) arranged on the focus cam barrel (504) and cooperating with the first limit switch (508).

9. The miniaturized continuous zoom mechanical structure according to claim 8, characterized in that: The variable power drive group further comprises a second limit switch (611) mounted on the support frame (4) and a second blocking piece (612) arranged on the variable power compensation cam barrel (606) and cooperating with the second limit switch (611).

10. The miniaturized continuous zoom mechanical structure according to claim 9, characterized in that: The outer surface of the detector (8) is treated with an anti-radiation coating, and the inner surface is treated with a conductive coating.

Images