Aperture assembly and imaging device including the same

Abstract

The present invention relates to the field of imaging equipment technology, and specifically provides an aperture assembly and an imaging equipment including the aperture assembly, aiming to solve the problem that the existing variable F number aperture has large energy consumption and complex structure and cannot be used on small equipment. To this end, the aperture assembly of the present invention comprises: a lens barrel; an annular baffle installed in the lens barrel, the outer edge of which is connected to the inner circumference of the lens barrel, and the inner edge forms a light-through hole; a filter installed in the light-through hole and connected to the annular baffle; a plurality of blades arranged on the annular baffle at intervals along the circumferential direction, the hinged portion of each blade is pivotally connected to the annular baffle, and the sliding portion is slidably connected to the annular baffle, and the sliding path is an arc so that the blade can rotate around the hinged portion; the plurality of sliding portions can slide simultaneously in the direction of the outer edge or the inner edge under the action of rotational inertia to change the light transmission area, so that the F number can be adjusted without a driving device, simplifying the structure of the device and reducing the overall energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging devices, and in particular provides an aperture assembly and an imaging device comprising the aperture assembly. Background Art

[0002] In order to further improve the performance of infrared zoom optical systems and take into account the requirements of spatial resolution and sensitivity, there is an urgent need for a cooled variable F-number infrared detector based on variable cold aperture technology. Compared with traditional infrared zoom optical systems, variable F-number infrared zoom optical systems can maintain a balance between resolution and sensitivity when switching between large and small fields of view, improve the aperture utilization of the optical system, and then reduce the radial size of the optical system, which is conducive to improving the imaging quality of infrared optical systems and miniaturization design.

[0003] By proportionally increasing or decreasing the opening size of the cold aperture, the F number of the detector can be adjusted.

[0004] However, the existing variable F-number aperture adopts electric drive adjustment, which not only increases the energy consumption of the equipment, but also leads to a complex structure and a large system, and cannot be used on small equipment.

[0005] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0006] The present invention aims to solve the above technical problem, namely, the existing variable F number diaphragm consumes a lot of energy and has a complex structure, and cannot be used on small equipment.

[0007] In a first aspect, the present invention provides an aperture assembly, comprising: a lens barrel, both ends of which are provided with openings; an annular baffle, the annular baffle is installed in the lens barrel, and the outer edge of the annular baffle is mechanically connected to or integrally arranged with the inner circumferential surface of the lens barrel, and the inner edge of the annular baffle forms a light-through hole; a filter, the filter is installed in the light-through hole and fixedly connected to the annular baffle; a plurality of blades, the plurality of blades are arranged on the annular baffle at intervals along the circumferential direction, and are movably connected to the annular baffle, and can synchronously move toward the inner edge or the outer edge under the inertia of the clockwise or counterclockwise rotation of the lens barrel, so as to block or avoid the edge portion of the light-through hole, thereby reducing or increasing the light-transmitting area.

[0008] In the preferred technical solution of the above-mentioned aperture assembly, the blade has a hinged portion and a sliding portion, the hinged portion is pivotally connected to the annular baffle, the sliding portion is slidably connected to the annular baffle, the sliding trajectory of the sliding portion is an arc and the radius of the arc is equal to the distance from the hinged portion to the sliding portion, so that the blade can rotate around the hinged portion.

[0009] In the preferred technical solution of the above-mentioned aperture assembly, a plurality of hinge holes are provided on the annular baffle, a pivot is provided on the hinge portion, the pivot is rotationally matched with the hinge hole, and / or a plurality of arc guide rails are provided on the annular baffle, a positioning pin is provided on the sliding portion, and the positioning pin is slidingly matched with the arc guide rail.

[0010] In the preferred technical solution of the aperture assembly, an inner limit groove and an outer limit groove are respectively provided at both ends of the arc-shaped guide rail, and both the inner limit groove and the outer limit groove can limit the positioning pin.

[0011] In the preferred technical solution of the above-mentioned aperture assembly, the arc guide rail is configured as a structure that is high in the middle and low at both ends, and an elastic needle is also installed at the bottom of the positioning pin, and the elastic needle can be extended and retracted according to the height change of the arc guide rail.

[0012] In the preferred technical solution of the above-mentioned aperture assembly, a plurality of the hinge holes are arranged at intervals on the annular baffle near the inner edge, the sliding portion is arranged on the side of the blade near the outer edge, the inner side of the blade is provided with a first arcuate edge and a second arcuate edge, the outer side of the blade is provided with a third arcuate edge, the curvature of the second arcuate edge is equal to that of the third arcuate edge, when the plurality of the sliding portions slide to the inner edge at the same time, the plurality of the first arcuate edges are connected end to end to form a circular area, the second arcuate edge is butt-jointed with the third arcuate edge to connect the plurality of blades into an annular shading plate.

[0013] In the preferred technical solution of the aperture assembly, an arc-shaped shading strip is further provided at the connection between the second arc-shaped edge and the third arc-shaped edge, and the arc-shaped shading strip is fixed on the second arc-shaped edge or the third arc-shaped edge.

[0014] In a preferred technical solution of the aperture assembly, a reflective layer is disposed on the outer surface of the lens barrel, and / or a light absorbing layer is disposed on the inner surface of the lens barrel.

[0015] In a preferred technical solution of the above aperture assembly, the number of the blades is set to three, and / or the light transmittance of the filter is greater than 85%.

[0016] In a second aspect, the present invention provides an imaging device comprising the aperture assembly described above.

[0017] When the above technical scheme is adopted, the aperture assembly of the present invention includes: a lens barrel, both ends of which are provided with openings; an annular baffle, which is installed in the lens barrel, and the outer edge of the annular baffle is mechanically connected to or integrally arranged with the inner circumferential surface of the lens barrel, and the inner edge of the annular baffle forms a light-through hole; a filter, which is installed in the light-through hole and fixedly connected to the annular baffle; a plurality of blades, which are arranged on the annular baffle at intervals along the circumferential direction and movably connected to the annular baffle, and can be synchronously moved toward the inner edge or outer edge under the inertia of the lens barrel rotating clockwise or counterclockwise, so as to block or avoid the edge portion of the light-through hole, thereby reducing or increasing the light-transmitting area. By reasonably setting the shapes of multiple blades and the movable connection structure between the blades and the annular baffle, the inertial force after the lens barrel is quickly rotated can be used to drive the multiple blades to move synchronously to the inside or outside of the annular baffle, so that the multiple blades can block or avoid the edge area of ​​the filter, thereby reducing or increasing its light transmission area and achieving the effect of adjusting the F number, so that the equipment can omit the electric drive adjustment device, reduce the comprehensive energy consumption of the equipment, simplify the structure of the equipment, and realize the use of the aperture assembly on small equipment.

[0018] Furthermore, the blade of the present invention has a hinge and a sliding part, the hinge is pivotally connected to the annular baffle, the sliding part is slidably connected to the annular baffle, the sliding track of the sliding part is an arc, and the radius of the arc is equal to the distance from the hinge to the sliding part, so that the blade can rotate around the hinge. Through such a setting, on the one hand, the blade can rotate between the light hole and the annular baffle with the hinge as the axis, so as to block or avoid the edge area of ​​the filter; on the other hand, this connection structure makes the movement of the blade more sensitive, and it is easier to rotate under the action of rotational inertia, so as to adjust the light transmission area.

[0019] Furthermore, the annular baffle of the present invention is provided with a plurality of hinge holes, the hinge portion is provided with a pivot, the pivot rotates with the hinge hole, and / or the annular baffle is provided with a plurality of arc guide rails, the sliding portion is provided with a positioning pin, the positioning pin slides with the arc guide rail. Through such a configuration, the rotating mechanism and the sliding mechanism have a simple structure and reliable operation, which not only ensures the relative rotation between the blade and the annular baffle, but also ensures the smoothness of the blade during the rotation process and the stability of the connection between the two.

[0020] Furthermore, the two ends of the arc-shaped guide rail of the present invention are respectively provided with an inner limit groove and an outer limit groove, and the inner limit groove and the outer limit groove can limit the positioning pin. Through such a setting, the positioning pin can be limited when it slides to the two ends of the arc-shaped guide rail respectively, so that the blade can be stopped at the blocking position or the avoidance position when the diaphragm is not rotated and adjusted, thereby ensuring the stability of the light transmission area and F number of the diaphragm during the use of the equipment.

[0021] Furthermore, the arc guide of the present invention is set to a structure with a high middle and low ends, and an elastic needle is installed at the bottom of the positioning pin, which can be extended and retracted according to the height change of the arc guide. Through such a setting, on the one hand, during the adjustment process, it helps the positioning pin to slide to the two ends of the arc guide, preventing the positioning pin from stopping in the middle of the arc guide and affecting the adjustment of the F number; on the other hand, when not adjusting, it prevents the positioning pin from sliding to the middle of the arc guide, improves the stability of the blade in the blocking position and the avoidance position, and further improves the light transmission area of ​​the aperture and the stability of the F number during the use of the equipment.

[0022] Furthermore, the multiple hinge holes of the present invention are arranged at intervals on the annular baffle near the inner edge, the sliding part is arranged on the side of the blade near the outer edge, the inner side of the blade is provided with a first arc edge and a second arc edge, the outer side of the blade is provided with a third arc edge, the second arc edge and the third arc edge have the same curvature, when the multiple sliding parts slide to the inner edge at the same time, the multiple first arc edges are connected end to end to form a circular area, and the second arc edge and the third arc edge are connected to connect the multiple blades into an annular shading plate. Through such a setting, on the one hand, it can ensure that the light hole is a circular area after each blade moves to the shielding position; on the other hand, it ensures the tightness of the connection between two adjacent blades, prevents light leakage at the connection, and improves the overall shading effect.

[0023] Furthermore, the connection between the second arc edge and the third arc edge of the present invention is also provided with an arc shading strip, which is fixed on the second arc edge or the third arc edge. By such a setting, the joint between two adjacent blades can be covered, which can further prevent light leakage and improve the shading effect.

[0024] Furthermore, the outer surface of the lens barrel of the present invention is provided with a reflective layer, and / or the inner surface of the lens barrel is provided with a light absorbing layer. The reflective layer can reduce the heat radiation from outside the field of view as much as possible, maintain the low temperature environment of the detector, and thus improve the sensitivity of the system; the light absorbing layer can make the non-imaging light beam entering the aperture form diffuse reflection, reducing the influence on the imaging light beam.

[0025] Furthermore, the number of blades of the present invention is set to three, and / or the light transmittance of the filter is greater than 85%. Through such a setting, the light transmittance performance of the filter is improved.

[0026] In addition, the imaging device further provided by the present invention on the basis of the above-mentioned aperture assembly has the technical effects possessed by the above-mentioned aperture assembly due to the adoption of the above-mentioned aperture assembly. Compared with the imaging device before the improvement, the imaging device of the present invention not only ensures the normal adjustment of the F number and the imaging effect, but also reduces the overall energy consumption, simplifies the device structure, and realizes the miniaturization of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 The structure of the aperture assembly of the present invention is schematically shown in FIG. Figure 1 ;

[0029] Figure 2 The structure of the aperture assembly of the present invention is schematically shown in FIG. Figure 2 ;

[0030] Figure 3 The structure of the aperture assembly of the present invention is schematically shown in FIG. Figure 3 ;

[0031] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0032] List of reference numerals:

[0033] 1. Lens barrel; 2. Annular baffle; 21. Hinge hole; 22. Arc guide rail; 221. Inner limit groove; 222. Outer limit groove; 3. Filter; 4. Blade; 41. First arc edge; 42. Second arc edge; 421. Arc shading strip; 43. Third arc edge; 44. Pivot; 45. Positioning pin. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0035] It should be noted that, in the description of the present invention, terms such as "inside", "outside", and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] Based on the problem pointed out in the background technology that the existing variable F number aperture consumes a lot of energy and has a complex structure, and cannot be used on small equipment. The present invention provides an aperture assembly and an imaging device including the aperture assembly, by arranging a plurality of blades at intervals on an annular baffle around the filter, so that the blades are movably connected to the annular baffle, and can synchronously move toward the inner edge or outer edge under the inertia of the clockwise or counterclockwise rotation of the lens barrel, so as to block or avoid the edge of the light hole, thereby reducing or increasing the light transmission area. Therefore, the F number can be adjusted without installing an electric drive device, reducing the overall energy consumption and simplifying the device structure.

[0038] ‌A variable F-number diaphragm is an optical device used to change the size of the diaphragm aperture. It is widely used in imaging devices such as infrared detectors and cameras. The amount of light entering the optical machine is controlled by adjusting the opening and closing degree of the diaphragm. Usually, a variable F-number diaphragm consists of multiple movable blades that rotate around a central axis to change the degree of overlap between them, thereby adjusting the aperture size of the diaphragm. The surface of the blades is usually specially treated to reduce light scattering and absorption.

[0039] Its working principle is based on the control of the amount of light passing through the diaphragm aperture. When the diaphragm aperture is larger, more light is allowed to pass through; when the diaphragm aperture is smaller, only less light is allowed to pass through. By rotating or sliding the diaphragm blades by the drive device, the size of the diaphragm aperture can be adjusted to achieve two-level adjustment of the F number, thereby achieving precise control of the amount of light.

[0040] For example, in an infrared detector, it is usually necessary to encapsulate the aperture in a vacuum dewar flask and keep it working at a low temperature through a cooling system, that is, a cold aperture. The cold aperture can further reduce the background radiation from outside the field of view by keeping the detector in a low-temperature working environment, thereby improving the overall performance of the system.

[0041] When adjusting the aperture of the existing variable F-number cold diaphragm, an electric drive device such as a drive motor is usually used to control the movement of the blades. This not only generates a large amount of heat radiation, increases the cooling load and comprehensive energy consumption of the detector, but also makes the variable diaphragm complex and bulky, affecting the use of the variable diaphragm on small detectors.

[0042] Based on the above reasons, Figures 1 to 3 As shown, the aperture assembly of the present invention includes a lens barrel 1, both ends of which are provided with openings to allow light to pass through; an annular baffle 2 is fixed in the lens barrel 1, and the annular baffle 2 is used to install a filter 3, and its outer edge is sealed and connected to the inner circumference of the lens barrel 1, and the two can be mechanically connected or integrally formed, and the inner edge forms a circular light hole.

[0043] The filter 3 is installed in the light-through hole, which can control the propagation direction and intensity distribution of light, eliminate stray light, and thus improve the imaging quality. Preferably, the light transmittance of the filter 3 of the present invention is greater than 85% to ensure high light transmission performance. The filter 3 is set to be circular, and its edge is fixedly connected to the inner edge of the annular baffle 2, so as to fill the light-through hole.

[0044] A plurality of blades 4 are arranged at intervals along the circumferential direction on the annular baffle 2. The blades 4 are movably connected to the annular baffle 2 and can synchronously move toward the inner edge or the outer edge under the inertia of the clockwise or counterclockwise rotation of the lens barrel 1, so as to block or avoid the edge area of ​​the filter 3, thereby reducing or increasing the light transmission area and achieving the effect of adjusting the F number.

[0045] Specifically, Figures 1 to 3 As shown, each blade 4 is provided with a hinged portion and a sliding portion, wherein the hinged portion is pivotally connected to the annular baffle 2, and the sliding portion is slidably connected to the annular baffle 2, the sliding trajectory of the sliding portion is an arc, and the radius R of the arc is equal to the distance from the hinged portion to the sliding portion, which enables the blade 4 to perform a circular motion with the hinged portion as the center and R as the rotation radius.

[0046] Preferably, if Figure 2 and Figure 3 As shown, a plurality of hinge holes 21 and arc guide rails 22 of the same number are provided on the annular baffle 2, and the hinge holes 21 and the arc guide rails 22 are alternately distributed along the circumferential direction, a pivot 44 is provided on the hinge portion of the blade 4, and a positioning pin 45 is provided on the sliding portion, and the pivot 44 and the positioning pin 45 on the same blade 4 are respectively adapted to the adjacent hinge holes 21 and arc guide rails 22, that is, the pivot 44 is inserted in the hinge hole 21 and can rotate with the hinge hole 21, and the positioning pin 45 is inserted in the arc guide rail 22 and can slide along the arc guide rail 22. The distance between the pivot 44 and the positioning pin 45 is the rotation radius R of the blade 4.

[0047] Further preferably, the hinge hole 21 is arranged at the inner edge of the annular baffle 2, and the two ends of the arc guide rail 22 are respectively arranged at the inner edge and the outer edge of the annular baffle 2, which are respectively recorded as the inner end point and the outer end point, and the positioning pin 45 is arranged on the side of the blade 4 close to the outer edge, so that the blade 4 can reciprocate between the filter 3 and the annular baffle 2. When the positioning pin 45 slides to the inner end point of the arc guide rail 22, the blade 4 is in the blocking position. At this time, multiple blades 4 can extend into the light-through hole to cover the edge area of ​​the filter 3, thereby reducing the light-transmitting area of ​​the filter 3; when the positioning pin 45 slides to the outer end point of the arc guide rail 22, the blade 4 is in the avoidance position. At this time, multiple blades 4 are completely retracted into the contour range of the annular baffle 2 to avoid the light-through hole, avoid overlapping with the filter 3 and blocking light, and maximize the light-transmitting area.

[0048] There is a certain distance between the outer end point and the inner end point of the arc-shaped guide rail 22 along the circumferential direction. Figures 1 to 3 As shown, when the lens barrel 1 rotates rapidly in the counterclockwise direction under the action of an external force, the blade 4 will be subjected to an inertial force in the counterclockwise direction. When the lens barrel 1 rotates rapidly in the clockwise direction under the action of an external force, the blade 4 will be subjected to an inertial force in the clockwise direction.

[0049] Therefore, when the blade 4 is in the avoidance position, the positioning pin 45 is located at the outer end point, and the multiple blades 4 are all within the contour range of the annular baffle 2 and separated from each other, so that the light-through hole is completely in a light-transmitting state, and the F number at this time is 1; when the blade 4 is in the blocking position, the positioning pin 45 is located at the inner end point, and the multiple blades 4 are all extended into the light-through hole and gathered together to form an annular shading plate, which blocks the edge area of ​​the filter 3, reducing the light-transmitting area of ​​the filter 3, so that the F number at this time is 2.

[0050] When the F number needs to be adjusted from 1 to 2, that is, the blade 4 is adjusted from the avoidance position to the blocking position, just quickly rotate the lens barrel 1 in the clockwise direction. When the lens barrel 1 stops rotating, under the action of inertia, the positioning pin 45 will slide from the outer end point to the inner end point, and multiple blades 4 will also rotate inward. During this process, multiple blades 4 change from a separated state to a gathered state, and rotate from the annular baffle 2 to the contour range of the light hole, thereby reducing the light transmission area of ​​the light hole.

[0051] When the F number needs to be adjusted from 2 to 1, that is, the blade 4 is adjusted from the blocking position to the avoidance position, just quickly rotate the lens barrel 1 in the counterclockwise direction. When the lens barrel 1 stops rotating, under the action of inertia, the positioning pin 45 will slide from the inner end point to the outer end point, and multiple blades 4 will also rotate outward. During this process, multiple blades 4 change from a gathered state to a separated state, and rotate from the light-transmitting hole to the contour range of the annular baffle 2, thereby restoring the light-transmitting area to the maximum.

[0052] The lens barrel 1 is usually installed inside the detector. In actual use, the detector can be held and quickly rotated, or the lens barrel 1 can be quickly rotated by a rotating device installed on the detector. Both can adjust the light transmission area and F number, making the adjustment process simple and convenient.

[0053] The number of blades 4 can be flexibly set as needed. In this application, Figures 1 to 3 As shown, the number of blades 4 is preferably set to three. The three blades 4 can rotate synchronously under the action of rotational inertia to gather inward or spread outward, thereby adjusting the light transmission area.

[0054] The shape of the blade 4 can also be flexibly set as required. Preferably, Figures 1 to 3 As shown, the blades 4 of the present invention are configured to be scimitar-shaped, with a first arcuate edge 41 and a second arcuate edge 42 provided on the inner side, and a third arcuate edge 43 provided on the outer side, wherein the curvature of the second arcuate edge 42 is equal to that of the third arcuate edge 43. When the blades 4 are in the blocking position, the three blades 4 are in a retracted state, and the first arcuate edges 41 on adjacent blades 4 are connected end to end to form a circular light-transmitting area. At the same time, the second arcuate edges 42 on adjacent blades 4 are connected to the third arcuate edges 43 to connect multiple blades 4 into a ring-shaped shading plate.

[0055] The curvature of the first arc edge 41 is set to 2π / 3 to ensure that the three first arc edges 41 can form a full circle. The curvature of the second arc edge 42 and the third arc edge 43 can be flexibly set as long as the curvatures of the two are equal. In the present application, the curvature of the two is preferably equal to the curvature of the light hole.

[0056] The setting of the first arc edge 41 can ensure that the light hole is a circular area after each blade 4 moves to the blocking position; the setting of the second arc edge 42 and the third arc edge 43 ensures the tightness of the connection between two adjacent blades 4, prevents light leakage at the connection, and improves the overall shading effect.

[0057] However, due to the limitation of process and materials, and the strong penetrability of the light beam, a small amount of light beam still leaks into the joint between the second arc edge 42 and the third arc edge 43. Therefore, in order to further improve the light shielding property of the blades 4 in the gathered state and prevent the light beam from entering from the joint between two adjacent blades 4, as shown in FIG. Figures 1 to 3 As shown, the present application preferably sets an arc-shaped shading strip 421 at the connection between the second arc-shaped edge 42 and the third arc-shaped edge 43, so that the arc-shaped shading strip 421 is fixed on the second arc-shaped edge 42 and extends a section toward the third arc-shaped edge 43 of the adjacent blade 4, so that the gap can be completely covered after the two are connected to prevent light from entering.

[0058] When adjusting the F number, it is necessary to keep the blade 4 stable in the shielding position or the avoidance position. Therefore, in order to prevent the positioning pin 45 from sliding freely in the arc guide rail 22, as shown in FIG. Figure 4 As shown, an inner limit groove 221 and an outer limit groove 222 are respectively provided at the inner end point and the outer end point, and the inner limit groove 221 and the outer limit groove 222 are both lower than the arc guide rail 22 to prevent the positioning pin 45 from sliding out. Only under the inertia of the rapid rotation of the lens barrel 1, the positioning pin 45 will slide out from the inner limit groove 221 or the outer limit groove 222.

[0059] More preferably, if Figure 4As shown, the arc guide rail 22 of the present invention is configured as a structure that is high in the middle and low at both ends, and an elastic needle head (not shown in the figure) is also installed at the bottom of the positioning pin 45. During the sliding process of the positioning pin 45 in the arc guide rail 22, the elastic needle head can adaptively extend and retract according to the height change of the arc guide rail 22.

[0060] Through such a setting, on the one hand, during the adjustment process, the positioning pin 45 can be helped to slide toward the two ends of the arc guide rail 22, preventing the positioning pin 45 from being stuck in the middle of the arc guide rail 22 and affecting the adjustment of the F number; on the other hand, when not adjusted, the positioning pin 45 is prevented from sliding toward the middle of the arc guide rail 22, thereby improving the stability of the blade 4 in the blocking position and the avoidance position, and further improving the light transmission area of ​​the aperture and the stability of the F number during use.

[0061] In order to block the background radiation from outside the field of view and reduce the interference of stray light, thereby improving the sensitivity and image contrast of the infrared detector, ensuring that the detector only receives the imaging beam, reducing the interference of the non-imaging beam, and improving the image quality.

[0062] The outer surface of the lens barrel 1 of the present invention is provided with a reflective layer, preferably gold-plated, and the inner surface of the lens barrel 1 is provided with a light-absorbing layer, preferably black and rough. The outer gold-plated layer can reduce the heat radiation from outside the field of view as much as possible, maintain the low temperature environment of the detector, and thus improve the sensitivity of the system; the inner light-absorbing layer can make the non-imaging light beam entering the aperture form diffuse reflection, reducing the influence on the imaging light beam.

[0063] In addition, the imaging device further provided by the present invention on the basis of the above-mentioned aperture assembly has the technical effects possessed by the above-mentioned aperture assembly due to the adoption of the above-mentioned aperture assembly. Compared with the imaging device before the improvement, the imaging device of the present invention not only ensures the normal adjustment of the F number and the imaging effect, but also reduces the overall energy consumption, simplifies the device structure, and realizes the miniaturization of the device.

[0064] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An aperture assembly, characterized in that: The aperture assembly comprises: A lens barrel (1), wherein both ends of the lens barrel (1) are provided with openings; an annular baffle (2), the annular baffle (2) being installed in the lens barrel (1), the outer edge of the annular baffle (2) being mechanically connected to or integrally arranged with the inner circumference of the lens barrel (1), and the inner edge of the annular baffle (2) forming a light-through hole; A filter (3), the filter (3) being mounted in the light-through hole and fixedly connected to the annular baffle (2); A plurality of blades (4), wherein the plurality of blades (4) are arranged on the annular baffle (2) at intervals along the circumferential direction; The blade (4) has a hinged portion and a sliding portion, the hinged portion is pivotally connected to the annular baffle (2), the sliding portion is slidably connected to the annular baffle (2), the sliding trajectory of the sliding portion is an arc, and the radius of the arc is equal to the distance from the hinged portion to the sliding portion, so that the blade (4) can rotate around the hinged portion; The annular baffle (2) is provided with a plurality of hinge holes (21), the hinge portion is provided with a pivot (44), the pivot (44) is rotatably engaged with the hinge hole (21), the annular baffle (2) is provided with a plurality of arc-shaped guide rails (22), the sliding portion is provided with a positioning pin (45), the positioning pin (45) is slidably engaged with the arc-shaped guide rail (22); An inner limit groove and an outer limit groove are respectively provided at both ends of the arc-shaped guide rail (22), and both the inner limit groove and the outer limit groove are lower than the arc-shaped guide rail (22) and can limit the positioning pin (45); The plurality of blades can be moved synchronously towards the inner edge or the outer edge under the inertia of the clockwise or counterclockwise rotation of the lens barrel (1), so as to block or avoid the edge portion of the light-through hole, thereby reducing or increasing the light-transmitting area.

2. The aperture assembly according to claim 1, characterized in that The arc-shaped guide rail (22) is configured as a structure that is high in the middle and low at both ends, and an elastic needle is also installed at the bottom of the positioning pin (45), and the elastic needle can be extended and retracted according to the height change of the arc-shaped guide rail (22).

3. The aperture assembly according to claim 1, characterized in that A plurality of hinge holes (21) are arranged at intervals on the annular baffle (2) at positions close to the inner edge, the sliding portion is arranged on one side of the blade (4) close to the outer edge, a first arcuate edge (41) and a second arcuate edge (42) are arranged on the inner side of the blade (4), a third arcuate edge (43) is arranged on the outer side of the blade (4), the second arcuate edge (42) and the third arcuate edge (43) have the same curvature, and when the plurality of sliding portions slide to the inner edge at the same time, the plurality of first arcuate edges (41) are connected end to end to form a circular area, and the second arcuate edge (42) and the third arcuate edge (43) are butted against each other so that the plurality of blades (4) are connected to form an annular light shielding plate.

4. The aperture assembly according to claim 3, characterized in that An arc-shaped shading strip (421) is further provided at the connection between the second arc-shaped edge (42) and the third arc-shaped edge (43); the arc-shaped shading strip (421) is fixed on the second arc-shaped edge (42) or the third arc-shaped edge (43).

5. The aperture unit according to any one of claims 1 to 4, characterized in that The outer surface of the lens barrel (1) is provided with a reflective layer, and / or the inner surface of the lens barrel (1) is provided with a light absorbing layer.

6. The aperture unit according to any one of claims 1 to 4, characterized in that The number of the blades (4) is set to three, and / or the light transmittance of the filter (3) is greater than 85%.

7. An imaging device, characterized in that: The imaging device comprises the aperture assembly according to any one of claims 1 to 6.

Images