Three-field switching device for infrared equipment

Abstract

The present invention relates to the field of view switching technology of optical equipment, and in particular to a three-field view switching device for infrared equipment, comprising: a housing component, a housing component having a containing cavity, a lens observation hole being provided on the housing component; a lens rotating component, the lens rotating component comprising a rotating lens barrel, six lens groups with different focal lengths being provided on the lens barrel, and the six lens groups being symmetrically distributed in pairs; a groove wheel positioning rotating component, the groove wheel positioning rotating component rotating to drive the lens rotating component to rotate; a positioning and fixing component, the positioning and fixing component being fixedly arranged above the lens rotating component, a limiting structure being provided on the positioning and fixing component, the limiting structure corresponding to the six lens groups one by one, locking the corresponding limiting structure to lock the corresponding lens group, so that the two symmetrical lens groups can be coaxial with the lens observation hole, and the switching of the three fields of view is completed. The three-field view switching device for infrared equipment of the present invention ensures stable and rapid switching among the three fields of view of telephoto, medium focal length and wide angle.

Description

Technical Field

[0001] The invention relates to the technical field of field switching of optical equipment, and in particular to a three-field switching device for infrared equipment. Background Art

[0002] Multi-field imaging technology can achieve imaging of targets at different distances and angles by switching different lenses or changing the focal length of the optical system. Multi-field imaging technology can improve the coverage and target recognition capabilities of the monitoring system. Compared with fixed-focal-length optical systems, the three-field lens switching device can search for targets within a large field of view at a small magnification at the short focal end, and track and aim at targets within a narrow field of view at a large magnification at the long focal end. Compared with the continuously variable focal length optical system, the three-field rotation switching device does not require the zoom group and the compensation group lens to move along the axial direction, and has the advantages of simple design and manufacturing and low cost.

[0003] The field of view switching device is a device used in an optical system, which can change the field of view range of the optical system by switching different field of view lenses. In the infrared multi-field of view device, the field of view switching device is often used to switch different infrared lenses to achieve infrared imaging under different field of view ranges. The field of view switching device is usually composed of a mechanical structure and a control circuit. The mechanical structure mainly includes a driver, a switching device and a limit device, etc., which can realize the precise switching and positioning of the infrared lens. The driver usually adopts a motor or an electromagnet, etc., which can provide sufficient force and speed to drive the switching device to move. The switching device is usually designed with a mechanical structure, such as gears, cams and connecting rods, etc., which can convert the movement provided by the driver into the switching movement of the infrared lens. The limit device is used to control the position of the switching device to avoid exceeding the specified working range. The control circuit is mainly used to control the movement of the driver and the feedback signal of the limit device. The control circuit can be programmed as needed to realize functions such as automatic switching and precise positioning. In the infrared multi-field of view device, the control circuit can switch different infrared lenses according to system needs and control their precise positioning to achieve infrared imaging under different fields of view.

[0004] Repeatable positioning technology is an important precision positioning technology. It refers to the accurate control of the position of the optical system by using limit devices and precision mechanical structures to ensure that the optical system can repeatedly reach the same position under different times and conditions. Repeatable positioning technology is usually used in fields such as high-precision measurement, manufacturing and automation systems. It can improve the stability, accuracy and reliability of the system to meet the needs of industry and scientific research.

[0005] In repeatable positioning technology, the most commonly used limit devices include photoelectric switches, mechanical switches, grating rulers and encoders, etc. They can output signals when the optical system moves to a specified position, thereby controlling the system to stop or change the direction of movement. By optimizing the design and debugging of the limit device, high-precision positioning and repeatable positioning of the optical system can be achieved. Different application scenarios have different requirements for positioning accuracy, and generally require positioning errors within a few microns. Therefore, it is necessary to select appropriate limit devices and mechanical structures to achieve high-precision positioning.

[0006] However, the positioning accuracy and stability of existing optical devices after rotation and positioning in harsh and special environments cannot meet the requirements. Summary of the invention

[0007] The technical problem to be solved by the present invention is: to solve the technical problem that the positioning accuracy and stability of the optical equipment in the prior art cannot meet the requirements after rotation and positioning in harsh environments and special environments. The present invention provides a three-field-of-view switching device for infrared equipment, which can ensure stable and fast switching after switching while performing stable switching of the three fields of view of telephoto, medium focal length and wide angle. The technical solution adopted by the present invention to solve its technical problem is: a three-field-of-view switching device for infrared equipment, comprising:

[0008] A housing component, wherein the housing component has a receiving cavity and a lens observation hole is provided on the housing component;

[0009] A lens rotating assembly, the lens rotating assembly comprising a rotating lens barrel, the lens barrel being provided with six lens groups with different focal lengths, the six lens groups with different focal lengths being symmetrically distributed in pairs;

[0010] A groove wheel positioning rotating assembly, wherein the groove wheel positioning rotating assembly is arranged below the lens rotating assembly, and the rotation of the groove wheel positioning rotating assembly drives the lens rotating assembly to rotate;

[0011] A positioning and fixing component is fixedly arranged above the lens rotating component. A limiting structure is provided on the positioning and fixing component. The limiting structure corresponds to the six groups of lens groups one by one. The corresponding limiting structure is locked to lock the corresponding lens group, so that the two symmetrical lens groups can be coaxially arranged with the lens observation hole to complete the switching of the three fields of view.

[0012] Furthermore, the shell assembly includes a shell, a base, an upper cover plate, a front lens hole and a rear lens hole. The shell body is a rectangular frame with hollowed-out sides, and the front lens hole and the rear lens hole are opened on the front and back sides; the upper cover plate and the lower cover plate form a rectangular cavity with the shell body, and the center of the front lens hole and the center of the rear lens hole are coaxial and parallel to each other.

[0013] Further, the multi-lens rotating assembly includes a polygonal rotating lens barrel, a telephoto lens group 1, a telephoto lens group 2, a medium focal lens group 1, a wide-angle lens group 1, a wide-angle lens group 2, a light hole, and a rotating fixed axis;

[0014] Further, the polygonal rotating lens barrel comprises a regular hexagonal hollow lens barrel, and a telephoto lens group 1 mounting hole, a medium focal length lens group 1 mounting hole, a wide-angle lens group 1 mounting hole, a telephoto lens group 2 mounting hole, a light-through hole, and a wide-angle lens group 2 mounting hole are sequentially installed clockwise at the center position of the polygonal side. The telephoto lens group 1 mounting hole is coaxial with the telephoto lens group 2 mounting hole, the medium focal length lens group 1 is coaxial with the light-through hole, the wide-angle lens group 1 is coaxial with the wide-angle lens group 2, and the extension lines of the center points of the six holes intersect at one point and are coaxial with the front and rear lens holes on the lens housing. In particular, the diameter of the medium focal length lens group light-through hole is larger than that of the medium focal length lens group 1 mounting hole, and the diameters of the front lens hole and the rear lens hole are both larger than the hole diameter on the rotating lens assembly.

[0015] Furthermore, the telephoto lens group 1, wide-angle lens group 2, telephoto lens group 2, wide-angle lens group 1, and medium-focus lens group 1 are coaxially mounted in the telephoto lens group 1 mounting hole, the wide-angle lens group 2 mounting hole, the telephoto lens group 2 mounting hole, the wide-angle lens group 1 mounting hole, and the medium-focus lens group 1 mounting hole, respectively.

[0016] Furthermore, the outer lower surface of the multi-lens rotating assembly coincides with the upper surface of the groove wheel rotation positioning assembly, and the rotation hole of the outer lower surface of the multi-lens rotating assembly coincides with the rotation hole of the lower surface groove wheel and are coaxial, the outer upper surface of the multi-lens rotating assembly coincides with the lower surface of the positioning and fixing assembly, and the central axis of the upper surface of the multi-lens rotating assembly is coaxial with the center of the lower surface of the positioning and fixing assembly, the center of the upper surface of the multi-lens rotating assembly is coaxial with the center of the lower surface, the upper surface and the lower surface of the polygonal rotating lens barrel are both regular hexagons and the sides of the upper and lower surfaces are symmetrical, the sides are regular quadrilaterals, and the quadrilaterals are connected to each other.

[0017] Furthermore, the groove wheel rotation positioning assembly is arranged inside the shell assembly, including a groove wheel assembly, a transmission assembly and a fixed rotation assembly, the groove wheel assembly includes an inner groove wheel, an outer groove wheel one, and an outer groove wheel two, the lower surface of the inner groove wheel overlaps and partially contacts with the lower surfaces of the outer groove wheel one and the outer groove wheel two, the inner groove wheel has four equidistant open notches, and the four equidistant open notches are arranged in a circular array around the center point of the inner groove wheel, the outer groove wheel one and the outer groove wheel two have the same diameter and are symmetrically arranged on both sides of the inner groove wheel, the outer groove wheel one and the outer groove wheel two are provided with a pin shaft and a distance ring, the outer surface of the pin shaft contacts with the notch of the inner groove wheel and reciprocates, and the inner groove wheel is driven to rotate by the groove wheel, the distance ring contacts with the inner groove wheel when the pin shaft is not in contact with the notch to position and stabilize the position of the inner groove wheel, the positioning ring has a mechanical positioning self-locking characteristic, which can improve the stability of the system.

[0018] Furthermore, the inner groove wheel overlaps with the lower surface of the lens rotating assembly and is fixed by bolts, and the relative positions of the inner groove wheel and the lens rotating assembly are fixed;

[0019] Further, the transmission assembly includes a long transmission shaft 1, a long transmission shaft 2, a short transmission shaft, a short transmission shaft of a motor, a large transmission gear 1, a large transmission gear 2, a small transmission gear 1, a small transmission gear 2 and a motor;

[0020] The long transmission shaft 1 and the long transmission shaft 2 are respectively connected to the outer groove wheel 1, the large transmission gear 1 and the outer groove wheel 2, the large transmission gear 2. The upper surface of the long transmission shaft is at the center of the outer groove wheel. The outer groove wheel moves in a circle around the long transmission shaft under the action of power. The lower surface of the long transmission shaft is at the center of the large transmission gear. The relative position of the long transmission shaft and the transmission gear is fixed and the power is provided by the transmission gear.

[0021] The upper surface of the short transmission gear 1 coincides with the lower surface of the support frame, and the short transmission gear 1 is fixed on the support frame; the lower surface of the short transmission shaft is at the center of the small transmission bearing and the two are relatively fixed;

[0022] The upper surface of the motor transmission shaft is in contact with the motor, and the lower surface of the motor transmission shaft is located at the center of the small transmission bearing and is relatively fixed;

[0023] Furthermore, the fixed rotating assembly includes a bearing seat, a transmission shaft, and a bearing seat; a support frame is fixed inside the housing assembly and is used to fix the groove wheel rotating fixed assembly, and on the support frame, from left to right, there are a long transmission shaft 1, a motor, a bearing seat, a short transmission shaft 1, and a long transmission shaft;

[0024] The bearing seat is fixed on the upper surface of the support frame, connected and relatively fixed to the lens rotating assembly through a transmission shaft and bolts, and a radial deep groove ball bearing is built into the bearing seat, and the bearing seat plays a fixing and supporting role;

[0025] The motor provides power to the motor transmission shaft 1, and the motor transmission shaft transmits the power to the small transmission gear 2, the large transmission gear 1, the large transmission gear 2, the large transmission shaft 1, the large transmission shaft 2, the outer groove wheel 1, the outer groove wheel 2, the inner groove wheel, and the lens rotating assembly in sequence;

[0026] In particular, the connection between the transmission shaft and the groove wheel, the support frame and the transmission bearing is connected by a deep groove ball bearing and a tightening sleeve, which can effectively reduce the transmission efficiency loss;

[0027] Furthermore, the relative position of the groove wheel rotation positioning structure and the rotating lens assembly is fixed, and when the pin shaft leaves the opening groove, the outer groove wheel positioning ring is used to fix the position of the inner groove wheel and then fix the angle of the lens rotating assembly, so that one side of the lens rotating assembly is parallel to the plane where the lens hole of the outer shell assembly is located, and at this time, the axis of one group of the three lens groups is coaxial with the lens of the outer shell assembly;

[0028] Furthermore, the positioning and fixing assembly includes a stabilizing frame and a limit hole frame mounted on the stabilizing frame, a group of transmission bearings, an angle displacement sensor, a rubber-coated bearing, and a limit electromagnet spring lock pin; the angle displacement sensor is mounted on the upper surface of the stabilizing frame and is used to measure the relative position of the required surface and the plane where the front lens of the housing assembly is located;

[0029] The limit hole frame has six limit holes distributed in a circular array on the outer surface of the limit hole frame, the diameter of the limit hole is the same as the diameter of the limit electromagnet spring lock pin steel ball head, and there are two steel columns at the mouth of the limit hole for providing support after the lock pin steel ball head contacts;

[0030] The rubber-coated bearing is on the lower surface of the rotating seat, and the outer surface of the rubber-coated bearing contacts the outer side of the limit hole frame, so as to provide support for the limit hole frame when rotating to prevent the lens rotating assembly from deviating in the vertical direction;

[0031] The limit electromagnet spring lock pin includes a lock pin housing, a lock pin shell, a signal receiver, an electromagnet, a spring, and a limit steel ball head; the parts are arranged in sequence in the lock pin shell and fixedly connected; the signal receiver adopts negative feedback, and after receiving the electromagnetic signal, the electromagnet is disconnected to make the magnetic force disappear, and the spring drives the limit steel ball head to pop out and contact the limit hole on the limit hole frame and lock;

[0032] The above-mentioned up, down, front, back, left, right, big, small, only indicate relative relationships;

[0033] Furthermore, in order to reduce the influence of stray light, filters are placed on the outside of the front lens and the rear lens of the housing assembly to filter the stray light, and anti-reflective coatings are applied to the housing assembly and the lens rotation assembly to filter the stray light to improve the imaging quality.

[0034] The innovation of the present invention is that the three-field-of-view switching device for infrared equipment of the present invention utilizes a hexagonal rotating assembly to install three groups of lenses and drives a groove wheel through a motor to adjust the lenses to the correct position. The required adjustment angle is less than 90°, the adjustment speed is fast and the mechanical distance is short. By utilizing the characteristics of the groove wheel, the position of the lens will not shift when it is in use position to ensure the accuracy of use.

[0035] The limit electromagnet spring lock pin can keep the lens in a stable use state after positioning. Its strong lock state will not cause the lens rotation assembly to shift under the action of external force or mechanical failure, and has high stability and impact resistance.

[0036] In the present invention, a filter and an external anti-reflection coating are used to eliminate the influence of stray light to improve the performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0038] Figure 1 is a three-dimensional exploded view of an application example of the present invention;

[0039] Figure 2 It is a front view and cross-sectional view of an application example of the present invention;

[0040] Figure 3 is a schematic diagram of the structure of a polygonal rotating lens barrel in one embodiment of the present invention;

[0041] Figure 4 is a cross-sectional view of a polygonal rotating lens barrel in an application example of the present invention;

[0042] Figure 5 It is a schematic diagram of the structure of a groove wheel rotation positioning assembly in an application example of the present invention;

[0043] Figure 6 It is a schematic diagram of the structure of a positioning and fixing component in an application example of the present invention;

[0044] Figure 7 It is a schematic diagram of the cooperation between the limiting hole and the limiting electromagnet spring lock pin in an application example of the present invention;

[0045] Figure 8 is a cross-sectional view of a spring lock pin of a limit electromagnet in an application example of the present invention;

[0046] Fig. 9 It is a front view of a positioning and fixing component in an application example of the present invention.

[0047] Reference numerals:

[0048] 1. Outer shell; 101. Front lens hole; 102. Rear lens hole; 2. Upper cover; 3. Base; 4. Positioning and fixing assembly; 5. Multi-lens rotating assembly; 51. Lens barrel; 6. Lens group; 7. Groove wheel rotating and positioning assembly; 401. Limit hole frame; 402. Limit large gear; 403. Limit small gear; 404. Rubber-coated bearing a; 405. Rubber-coated bearing b; 406. Rubber-coated bearing c; 407. Rubber-coated bearing d; 408. Limit electric Magnet spring lock pin; 4081, trigger; 4083, electromagnet; 4084, spring; 4086, steel ball head; 409, angle displacement sensor; 411, stabilizer; 421, telephoto lens group limit hole; 422, mid-focus lens group limit hole; 423, wide-angle lens group limit hole; 501, telephoto lens group 1 mounting hole; 502, mid-focus lens group 1 mounting hole; 503, wide-angle lens group 1 mounting hole; 504, telephoto lens group 2 mounting hole; 505 Light hole; 506, wide-angle lens group 2 mounting hole; 601, telephoto front lens; 602, medium-focus lens; 603, wide-angle front lens; 604, telephoto rear lens; 606, wide-angle rear lens; 611, mounting hole; 701, outer groove wheel a; 7011, pin a; 7012, distance ring; 702, inner groove wheel; 7021, notch a; 7022, notch b; 703, outer groove wheel b; 7031, pin b; 7032, distance ring ; 711, support frame; 721, large transmission gear a; 722, small transmission gear a; 723, small transmission gear b; 724, large transmission gear b; 731, long transmission shaft a; 732, short transmission shaft; 733, short transmission shaft of motor; 734, long transmission shaft b; 741, bearing seat; 742, bolt; 743, gasket; 744, transmission bolt; 745, transmission shaft; 746, bearing; 747, orifice; 751, motor; DETAILED DESCRIPTION

[0049] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] See also Figure 1 The purpose of the present invention is to provide a three-field-of-view switching device for infrared optical equipment. The structure of the present invention mainly includes a shell component, a multi-lens rotating component 5 inside the shell component, a groove wheel rotating positioning component 7, and a positioning and fixing component 4.

[0054] The above-mentioned shell assembly includes an outer shell body 1, an upper cover plate 2, a lower cover plate 3, a front lens hole 101, and a rear lens hole 102; the outer shell body is a rectangular frame with hollowed-out sides, and a front lens hole 101 and a rear lens hole 102 are opened on the front and back sides; in order to save materials and maximize the use of space, the outer shell body 1 adopts a rectangular structure, and the upper cover plate 2 and the lower cover plate 3 form a rectangular cavity with the outer shell body. The upper and lower covers are detachable. In order to facilitate the installation of the polygonal rotating shell 5, screws are used to fix it on the outside, and holes are opened on the side to facilitate observation of the operation of the equipment.

[0055] See also Figure 1 , Figure 3 , Figure 4The multi-lens rotating assembly includes a polygonal rotating lens barrel 51 with regular hexagonal upper and lower surfaces and rectangular sides. The polygonal rotating lens barrel includes a regular hexagonal hollow lens barrel 51, and a telephoto lens group 1 mounting hole 501, a mid-focus lens group 1 mounting hole 502, a wide-angle lens group 1 mounting hole 503, a telephoto lens group 2 mounting hole 504, a light-through hole 505, and a wide-angle lens group 2 mounting hole 506 are sequentially installed clockwise at the center of the polygonal side. The telephoto lens group 1 mounting hole 501 and the telephoto lens group 2 mounting hole 504, the wide-angle lens group 2 mounting hole 506 and the wide-angle lens group 1 mounting hole 503, the mid-focus lens group 1 mounting hole 502, and the light-through hole 505 are coaxial, and the center points of the three groups of holes intersect at one point. The six mounting holes are arranged clockwise along the sideline at the center point of the side, see Figure 4 The optical paths between the holes will not interfere with each other, and the angle between adjacent holes is 60°. The three groups of lenses rotate exactly 180 degrees, which coincides with the angle of rotation of the groove wheel to complete a cycle of movement.

[0056] like Figure 4 As shown, the telephoto front lens 601 and the telephoto rear lens 604, the medium focus lens 602, the wide-angle front lens 603 and the wide-angle rear lens 606 are respectively installed in the telephoto lens group 1 mounting hole 501 and the telephoto lens group 2 mounting hole 504, the medium focus lens group 1 mounting hole 502, the wide-angle lens group 1 mounting hole 503 and the wide-angle lens group 2 mounting hole 506 in sequence, and spacers and pressure rings are arranged to adjust the positions of the lenses to obtain the best effect. The lenses are all processed by high-speed CNC lathes for precision processing. The eccentricity of the lens in each switching lens group is less than 0.002mm, the tilt is less than 0.3 arc minutes, the eccentricity of each coaxial lens group 6 is less than 0.01mm, and washers and pressure rings are installed between each lens, which can fix the position and facilitate adjustment. The optical materials of the above-mentioned telephoto lens group lenses are zinc selenide, single crystal germanium, zinc sulfide, and single crystal germanium respectively. The lens 604 of the telephoto rear lens is mainly used to correct position chromatic aberration and magnification chromatic aberration and eliminate system thermal difference. The light hole 505 of this embodiment is a special light hole for the mid-focus lens 602, and its hole diameter is larger than the diameter of the mid-focus lens. Preferably, the rotating lens barrel and the pressing ring of the present invention are both made of aluminum alloy, which can better eliminate the thermal difference of the system.

[0057] The above-mentioned multi-lens rotating assembly 5 is installed inside the shell, and the inner groove wheel 702 of the groove wheel rotation positioning assembly 7 is connected to the mounting hole 611 through the transmission shaft 745. The lower surface opening 747 is coaxial with the center of the inner groove wheel 702 and is fixed by bolts and provided with lateral support by the bearing seat 741. In this embodiment, the groove wheel rotation positioning assembly 7 drives the multi-lens rotating assembly 5 to rotate horizontally and makes the lens center of the multi-lens rotating assembly 5 coaxial with the front and rear lenses of the shell at a certain angle.

[0058] In this embodiment, the motor 751 provides power, and the power is transmitted to the multi-lens rotating assembly 5 through the motor short transmission shaft 733, the small transmission gear b723, the large transmission gear b724, the long transmission shaft b734, the outer groove wheel b703, the inner groove wheel 702 and the small transmission gear b723, the small transmission gear a722, the large transmission gear a721, the long transmission shaft a731, the outer groove wheel a701, and the inner groove wheel 702 to provide axial rotation power for it. In this embodiment, the long transmission shaft a731 connects the outer groove wheel a701, the support frame 711 and the large transmission gear a721 through a tightening sleeve and a bearing. The long transmission shaft a731 and the outer groove wheel a701, the support frame 711 and the large transmission gear a721 are connected with a notch design. The bearing 746 and the groove wheel and the support frame 711 can be fixed on the transmission shaft to avoid lateral movement that affects the adjustment accuracy. The long transmission shaft b734 connects the outer groove wheel b702, the support frame 711 and the large transmission gear b724 through the adapter sleeve and the bearing. The bottom of the bearing seat 741 is fixed to the support frame 711 by bolts 742 to prevent deflection. The transmission bolt 744 is embedded in the bottom of the bearing seat 741 to provide lateral support for the multi-lens rotating assembly 5. Figure 4 In this example, the outer groove wheel a701 is embedded in the opening notch a7021 of the inner groove wheel 702 through the pin a7011 and drives it to rotate. After the telephoto lens group is adjusted to be coaxial with the lens of the outer shell assembly, the inner groove wheel 702 is stationary. After the observation is completed, the motor is started, and the pin b7031 of the outer groove wheel b703 is embedded in the opening notch b7022 of the inner groove wheel 702 to drive the multi-lens rotating assembly 5 to rotate in the opposite direction. After adjusting to the wide-angle lens, it stops running. From the time when the pin 7011 on the outer groove wheel a701 enters the opening notch a7021 of the inner groove wheel to the time when the pin b7031 on the outer groove wheel b703 leaves the opening notch b7022 of the inner groove wheel 702 is a cycle. In this cycle, the rotation amplitude of the lens group 6 is 180°, which can cover the entire range of the three lens groups 6. Since it does not require the motor to reverse, it can effectively reduce the time for adjusting the lens, so that the lens can be quickly positioned to the observation position. In this example, after the pin a7011 on the outer groove wheel a701 leaves the opening slot a7021 and before the pin b7031 on the outer groove wheel b703 enters the opening slot b7022, the distance ring a7012 is always in contact with the inner groove wheel 702 and fixes the inner groove wheel to prevent it from rotating and affecting the accuracy; after the pin b7031 on the outer groove wheel b703 leaves the opening slot b7022 and before the pin a7011 on the outer groove wheel a701 enters the opening slot a7021, the distance ring b7032 is always in contact with the inner groove wheel and fixes the inner groove wheel to prevent it from rotating and affecting the accuracy.

[0059] See also Figure 6 , Figure 7 , Figure 8In the above positioning and fixing assembly, the position-limiting hole frame 401 and the position-limiting large gear 402 are mounted on the upper surface of the multi-lens rotating assembly 5 and fixed by bolts, and the stabilizing frame 411 is fixed on the upper cover plate 2 by bolts. In this example, the lower surface of the stabilizing frame 411 contacts the upper surface of the position-limiting hole frame 401 and contacts the position-limiting hole frame 401 through the rubber-coated bearings a404, b405, c406, and d407. When the multi-lens rotating assembly 5 rotates, the rubber-coated bearings rotate to provide lateral support; preferably, the position-limiting small gear 403 is mounted as shown in FIG. Figure 6 As shown in the figure, the limiting gear 402 is coupled with each other to provide axial rotation support; the limiting hole 421 of the telephoto lens group, the limiting hole 422 of the medium-focus lens group, and the limiting hole 423 of the wide-angle lens group are respectively installed above the first mounting hole 501 of the telephoto lens group, the first mounting hole 502 of the medium-focus lens group, and the first mounting hole 503 of the wide-angle lens group. In this example, the medium-focus lens 602 is rotated to the observation position and is coaxial with the front lens hole 101 of the outer shell group. At this time, the steel ball head in the limiting electromagnet spring lock pin 408 coincides with the position of the limiting hole 422 of the medium-focus lens group. At this time, the position is confirmed by the angle displacement sensor 409, and the signal is transmitted to the trigger 4081. The trigger The 4081 signal is transmitted to the electromagnet 4083 to cut off the power, and the spring 4084 drives the steel ball head 4086 to pop out and embed into the limiting hole 422 of the mid-focus lens group. At this time, the relative position of the stabilizing frame 411 and the limiting hole frame 401 is locked. After the observation is completed, the trigger 4081 signal is transmitted to the electromagnet 4083 to energize, the steel ball head retracts, the limiting hole frame 401 rotates, and the limiting fixation is completed; in this embodiment, the steel ball head and the limiting hole are the same size, and the limiting electromagnet spring lock pin 408 is embedded in the limiting hole by receiving the electrical signal, fixes the limiting hole frame and then fixes the rotating lens assembly, so that the lens does not have axial displacement during the observation process to affect the accuracy.

[0060] The three-field-of-view switching device of the infrared optical equipment in this embodiment can work stably in areas with strong winds such as industrial parks, and can realize rapid switching of the three fields of view of telephoto, medium focal length, and wide angle, and is suitable for the measurement of infrared optical systems.

[0061] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A three-field switching device for infrared equipment, It is characterized in that include: A housing component, wherein the housing component has a receiving cavity and a lens observation hole is provided on the housing component; A lens rotating assembly, the lens rotating assembly comprising a rotating lens barrel, the lens barrel being provided with six lens groups with different focal lengths, the six lens groups with different focal lengths being symmetrically distributed in pairs; A groove wheel positioning rotating assembly, wherein the groove wheel positioning rotating assembly is arranged below the lens rotating assembly, and the rotation of the groove wheel positioning rotating assembly drives the lens rotating assembly to rotate; A positioning and fixing assembly, the positioning and fixing assembly is fixedly arranged above the lens rotating assembly, and a limiting structure is provided on the positioning and fixing assembly, and the limiting structure corresponds to the six groups of lens groups one by one. The corresponding limiting structure is locked to lock the corresponding lens group, so that the two symmetrical lens groups can be coaxially arranged with the lens observation hole, and the switching of the three fields of view is completed; The housing assembly comprises: a housing, a base, and an upper cover plate, wherein a receiving cavity is formed inside the housing, the base, and the upper cover plate, and the lens observation hole comprises a front lens hole and a rear lens hole, wherein the front lens hole and the rear lens hole are respectively arranged on two sides of the housing, and the front lens hole and the rear lens hole are coaxially arranged; The lens barrel is a regular hexagonal hollow lens barrel, and is provided with a first mounting hole for a telephoto lens group, a first mounting hole for a mid-focus lens group, a first mounting hole for a wide-angle lens group, a second mounting hole for a telephoto lens group, a light-through hole, and a second mounting hole for a wide-angle lens group in a clockwise order at the center of the side of the lens barrel. The first mounting hole for the telephoto lens group is coaxial with the second mounting hole for the telephoto lens group, the first mounting hole for the mid-focus lens group is coaxial with the light-through hole, the first mounting hole for the wide-angle lens group is coaxial with the second mounting hole for the wide-angle lens group, and the extended axes of the six holes intersect at one point, and the corresponding two holes can be rotated to be coaxial with the front lens hole and the rear lens hole; The sheave positioning rotation assembly comprises a sheave assembly and a transmission assembly, wherein the transmission assembly drives the sheave assembly to rotate, and the sheave assembly comprises an inner sheave, an outer sheave one, and an outer sheave two, wherein the lower surface of the inner sheave overlaps and partially contacts with the upper surfaces of the outer sheave one and the outer sheave two, the inner sheave has four equidistant opening notches, and the four equidistant opening notches are arranged in a circular array around the center point of the inner sheave, the outer sheave one and the outer sheave two have the same diameter and are symmetrically arranged on both sides of the inner sheave, the outer sheave one and the outer sheave two are provided with a pin shaft and a distance ring, the outer surface of the pin shaft contacts with the notch of the inner sheave and reciprocates, and the inner sheave is driven to rotate by the outer sheave, and the positioning ring contacts with the outer periphery of the inner sheave when the pin shaft is not in contact with the notch, so as to locate and stabilize the position of the inner sheave; The positioning and fixing assembly includes a stabilizing frame and a limit hole frame installed on the stabilizing frame, an angle displacement sensor, a rubber-coated bearing, and a limit electromagnet spring lock pin. The limit hole frame is arranged above the lens rotation assembly and is fixedly connected to the lens rotation assembly. The angle displacement sensor is installed on the upper surface of the stabilizing frame and is used to measure the relative position of the required surface and the plane where the front lens hole of the shell assembly is located. The limit hole frame has six limit holes distributed in a circular array on the outer surface of the limit hole frame. The six limit holes correspond to the six lens holes one by one, and the diameter of the limit hole is the same as the diameter of the steel ball head of the limit electromagnet spring lock pin. There are two steel columns at the mouth of the limit hole for providing support after the locking pin steel ball head contacts. The rubber-coated bearing is on the lower surface of the stabilizing frame, and the outer surface of the rubber-coated bearing contacts the outer side of the limit hole frame, which is used to provide support for the limit hole frame when it rotates to prevent the lens rotation assembly from shifting in the vertical direction. The limit electromagnet spring lock pin includes a lock pin shell, a lock pin shell, a signal receiver, an electromagnet, a spring and a limit steel ball head. The signal receiver adopts negative feedback. After receiving the electromagnetic signal, the electromagnet is disconnected to make the magnetic force disappear. The spring drives the limit steel ball head to pop out and contact and lock the limit hole on the limit hole frame, so that the corresponding lens group is locked.

2. The three-field-of-view switching device for infrared equipment according to claim 1, It is characterized in that The telephoto lens group 1 mounting hole, the mid-focus lens group 1 mounting hole, the wide-angle lens group 1 mounting hole, the telephoto lens group 2 mounting hole, the light-through hole and the wide-angle lens group 2 mounting hole are respectively installed with the telephoto lens group 1, the mid-focus lens group 1, the wide-angle lens group 1, the telephoto lens group 2, the light-through hole and the wide-angle lens group 2.

3. The three-field-of-view switching device for infrared equipment as claimed in claim 2, It is characterized in that The diameters of the front lens hole and the rear lens hole are both larger than the diameter of the lens hole on the lens rotation assembly.

4. The three-field-of-view switching device for infrared equipment according to claim 1, It is characterized in that The inner groove wheel contacts the lower surface of the lens rotating assembly and is fixed by bolts. The inner groove wheel is relatively fixed to the lens rotating assembly, and the inner groove wheel drives the lens rotating assembly to rotate.

5. The three-field-of-view switching device for infrared equipment as claimed in claim 4, It is characterized in that The transmission assembly includes a long transmission shaft 1, a long transmission shaft 2, a short transmission shaft, a motor, a short transmission shaft of the motor, a large transmission gear 1, a large transmission gear 2, a small transmission gear 1, a small transmission gear 2 and a support frame. The support frame is arranged horizontally, and the long transmission shaft 1, the long transmission shaft 2 and the short transmission shaft are all vertically arranged on the support frame and connected through bearings. The motor is arranged below the support frame, and the short transmission shaft of the motor is transmission-connected to the motor. The lower end of the short transmission shaft of the motor is fixedly connected to the small transmission gear 2, and the small transmission gear 2 is respectively meshed with the small transmission gear 1 and the large transmission gear 2, and the large transmission gear 2 is fixedly connected to the lower end of the long transmission shaft 2, and the upper end of the long transmission shaft 2 is fixedly connected to the outer groove wheel 2, and the small transmission gear 1 is fixedly connected to the lower end of the short transmission shaft, and the small transmission gear 1 is meshed with the large transmission gear 1, and the large transmission gear 1 is fixedly connected to the lower end of the long transmission shaft 1, and the upper end of the long transmission shaft is fixedly connected to the outer groove wheel 1.

6. The three-field-of-view switching device for infrared equipment as claimed in claim 5, It is characterized in that The groove wheel positioning rotation assembly is fixedly connected to the lens rotation assembly. When the pin shaft leaves the groove, the outer groove wheel positioning ring is used to fix the inner groove wheel to fix the angle of the lens rotation assembly, so that the axis of one of the three groups of lenses is coaxial with the front lens hole and the rear lens hole of the outer shell assembly.

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