A telescope stray light suppression structure

Abstract

The present invention relates to the technical field of space telescopes, and specifically provides a stray light suppression structure for a telescope, which breaks through the limitation of the traditional design of a stray light suppression structure on the telescope's own structure. A follow-up light-shielding curtain is provided on the follow-up dome skylight of the telescope. The light-shielding curtain includes a plurality of light-shielding plates. There is a light-transmitting area with the same diameter as the telescope aperture between the two middle light-shielding plates. The adjacent light-shielding plates on both sides of the light-transmitting area are connected in a laminated sliding manner. When the telescope's pointing changes, the light-transmitting area slides along the follow-up dome skylight. The adjacent light-shielding plates overlap or unfold to adjust the pointing of the light-transmitting area, and the light-shielding plates are used to avoid the existence of an ineffective slit between the telescope aperture and the follow-up dome skylight, thereby preventing stray light from entering through the slit. Without increasing the length of the telescope barrel and the turning radius, the present invention effectively suppresses the stray light outside the field of view.

Description

Technical Field

[0001] The present invention belongs to the technical field of space telescopes, and particularly relates to a stray light suppression structure for a telescope. Background Art

[0002] With the continuous improvement of the observation ability of telescopes, the demand for the detection of faint celestial bodies and high-resolution observation is gradually increasing; at the same time, fields such as daytime imaging and daytime laser ranging have put forward higher requirements for the all-day operation of telescopes. These requirements make the suppression of stray light outside the field of view of the telescope system become more and more important. When the optical system images a target, when the light outside the field of view is transmitted to the detector through complex optical elements, structural elements, etc., it will directly affect the signal-to-noise ratio of the image. Severe stray light outside the field of view will submerge the target. Especially for the stray light under strong light, if it cannot be effectively suppressed, the detector will be saturated, overloaded, and may even be damaged. At present, the main methods for suppressing stray light in the optical system include designing a stray light suppression structure in the optical path, spraying an extinction coating, installing an aperture stop, etc.

[0003] In addition to considering optimizing the layout in optical design and reasonably selecting optical materials to reduce stray light, in the entire telescope system, stray light suppression structures such as light-shielding tubes, light-shielding covers, and light-blocking rings are basically designed in the optical path. Among them, the light-shielding tube is at the very front of the entire optical system, and a light-blocking ring is added inside the light-shielding tube. In addition, stray light is suppressed by installing light-shielding covers in the central hole of the primary mirror and the secondary mirror. However, when facing a large shielding angle requirement, the length of the light-shielding tube needs to be very long, which directly increases the weight and gyration radius of the telescope. At the same time, for telescopes used in strong skylight scenarios such as daytime, the stray light elimination ability of traditional light-shielding tubes is not prominent and it is difficult to meet the high-precision observation requirements. Summary of the Invention

[0004] In view of this, the present invention aims to provide a stray light suppression structure for a telescope, breaking away from the inertial thinking of designing a stray light suppression structure on the telescope structure, innovatively designing a stray light suppression structure on the follow-up dome of the telescope, and reducing the light transmission area of the skylight of the traditional follow-up dome to an observation window that only matches the telescope aperture through a follow-up light-shielding curtain, solving the problem that the traditional follow-up dome has observation slits that will introduce a large amount of stray light and severely restricting the detection ability of the telescope. Without increasing the length of the telescope barrel and the gyration radius, the stray light during the observation of the telescope is effectively suppressed.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] The present invention provides a stray light suppression structure for a telescope, including:

[0007] The light-shielding curtain of the follow-up dome skylight of the telescope, the light-shielding curtain includes a plurality of light-shielding plates arranged along the follow-up dome skylight. Among them, there are two light-shielding plates fixedly connected by a connecting rod, and there is a light-transmitting area adapted to the telescope aperture between these two light-shielding plates. The adjacent light-shielding plates on both sides of the light-transmitting area are connected by laminated sliding;

[0008] When the light-transmitting area slides along the follow-up dome skylight, the light-shielding plate on one side of the light-transmitting area reduces the covering area of the light-shielding plate on this side by overlapping each other, and the light-shielding plate on the other side of the light-transmitting area increases the covering area of the light-shielding plate on this side by unfolding each other. The light-shielding plates on both sides of the light-transmitting area can be completely overlapped and hidden in the non-skywindow area of the follow-up dome.

[0009] Preferably, the follow-up dome is provided with a sliding door for opening or closing the skylight.

[0010] Preferably, the light-shielding curtain is made of aluminum.

[0011] Preferably, the adjacent light-shielding plates on both sides of the light-transmitting area are interlocked through a limiting structure to prevent the formation of light-transmitting slits between adjacent light-shielding plates.

[0012] Preferably, the two light-shielding plates connected by the connecting rod are provided with pulleys at the two top corners far from the light-transmitting area; pulleys are provided at the four top corners of the remaining light-shielding plates;

[0013] A pair of sliding tracks along the sliding direction of the light-transmitting area are provided on both sides of each light-shielding plate;

[0014] The adjacent light-shielding plates on both sides of the light-transmitting area are connected by pulleys inserted into the sliding tracks.

[0015] Preferably, the surface of the light-shielding curtain facing the inside of the follow-up dome is provided with a light-absorbing coating.

[0016] Preferably, the surface of the light-shielding curtain facing the outside is provided with a high-reflectivity coating.

[0017] Preferably, the light-shielding plate includes: a grid array formed by periodically arranging horizontal ribs and arch ribs, and a semi-blind cylindrical ring is provided in each grid. The semi-blind cylindrical ring includes a semi-blind cylindrical ring with only the upper bottom surface open and a semi-blind cylindrical ring with only the lower bottom surface open. The semi-blind cylindrical rings with the upper bottom surface open and the lower bottom surface open are alternately distributed, and radial air holes are provided between adjacent semi-blind cylindrical rings.

[0018] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0019] The present invention breaks through the traditional inertial thinking of designing stray light suppression structures on the telescope structure. Innovatively, the stray light suppression structure is designed on the follow-up dome of the telescope without changing the optical system of the telescope, simplifying the measures for eliminating stray light from the telescope. The light-transmitting area of the skylight is reduced to match the aperture of the telescope through the follow-up light-shielding curtain on the follow-up dome, avoiding the stray light entering from the observation slit of the follow-up dome during telescope observation. Without increasing the length of the telescope barrel and the radius of gyration, the stray light is effectively suppressed.

[0020] The light-shielding curtain of the present invention adopts a laminated sliding design, which can achieve synchronous movement with the telescope pointing. It is easy to operate without additional adjustment or complex operation procedures, improving the use efficiency of the telescope. Moreover, the light-shielding curtain is made of lightweight aluminum material, avoiding a significant increase in the weight of the follow-up dome, reducing the requirements for the drive system of the follow-up dome, and also reducing the manufacturing and maintenance costs of the light-shielding curtain.

[0021] On the light-shielding plate of the present invention, semi-blind cylindrical rings are alternately arranged, and air holes are provided between the semi-blind cylindrical rings. It can not only effectively block stray light but also maintain air flow, ensuring that the visual clarity of the telescope observation aperture is not damaged and avoiding wind-induced vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 is a schematic diagram of the positional relationship between the light-shielding curtain and the follow-up dome according to an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the structure of the light-shielding curtain according to an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the structure of the light-shielding plate according to an embodiment of the present invention.

[0026] Among them, the reference numerals include:

[0027] Follow-up dome 1, sliding door 2, light-shielding curtain 3, first light-shielding plate 31, second light-shielding plate 32, third light-shielding plate 33, fourth light-shielding plate 34, light-transmitting area 35, connecting rod 36, slideway 37;

[0028] Horizontal rib 301, arch rib 302, grid 303, semi-blind cylindrical ring 304. DETAILED DESCRIPTION OF THE INVENTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than constituting a limitation to the present invention. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present invention. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present invention are not shown or described in the specification in order to avoid the core part of the present invention being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0030] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other to form various embodiments. At the same time, the steps or actions in the method description can also be adjusted in the order that is obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0034] Please refer to Figure 1 , in an embodiment of the present invention, a telescope stray light suppression structure is provided, mainly aiming at the problem that the stray light is serious during the daytime operation of the telescope, which affects the observation ability of the telescope. The traditional methods are all to optimize the design of the telescope barrel, which will lead to the problems of increasing the length and gyration radius of the telescope barrel. However, when observing during the daytime with a strong skylight background, the traditional methods have a poor stray light suppression effect and cannot meet the requirement of the telescope for high-precision observation during the daytime. The embodiment of the present invention starts from the follow-up dome 1 of the telescope, breaking through the inertial thinking of designing the stray light suppression structure on the telescope barrel structure, and setting a light-shielding curtain 3 at the skylight position of the follow-up dome 1 of the telescope. Specifically, the follow-up dome 1 is an auxiliary device for high-precision detection of a space high-precision telescope, which is convenient for the telescope to track and observe, and avoids the influence of the external environment on the observation ability of the telescope. The follow-up dome 1 is usually spherical, with a light-passing skylight provided thereon, and a sliding door 2 for closing and opening the skylight is provided. During the observation process of the telescope, the skylight is in an open state, and the follow-up dome 1 can rotate integrally with the telescope inside it to track the azimuth angle of the telescope, avoiding the follow-up dome 1 from affecting the observation aperture of the telescope. The follow-up dome 1 can greatly reduce the influence of stray light on the telescope, but there will still be an observation slit, resulting in stray light shooting towards the telescope from the ineffective observation slit. It can be understood that the skylight of the follow-up dome 1 covers the pitch angle of the telescope, so the skylight is usually a light-passing area with a 90-degree pitch angle. However, the area of the skylight is larger than the aperture of the telescope, so there will be an ineffective observation slit between the aperture of the telescope and the skylight of the follow-up dome 1, resulting in a large amount of ineffective stray light shooting towards the telescope, seriously restricting the detection ability of the telescope.

[0035] The stray light suppression structure of the telescope provided by the embodiment of the present invention mainly includes a light-shielding curtain 3 arranged inside the skylight of the follow-up dome 1, and the light-shielding curtain 3 is fixed to the follow-up dome 1 through an internal skeleton. After the sliding door 2 is opened, the originally open light-transmitting area of the skylight is blocked by the light-shielding curtain 3, and only an observation window adapted to the telescope aperture, that is, a light-transmitting area 35, is reserved in the telescope pointing area. It can be understood that the adaptation to the telescope aperture here means that the area of the telescope aperture is equal to the area of the light-transmitting area 35. In the actual design process, it is not required that the area of the telescope aperture is exactly equal to the area of the light-transmitting area 35, and it can be custom-designed according to specific stray light suppression requirements. Please refer to Figure 2 , the light-shielding curtain 3 is designed with a multi-segment laminated folding structure, which can make the light-transmitting area 35 move with the pitching motion of the telescope, and maximize the suppression of stray light outside the field of view from entering the entrance pupil of the telescope optical system. Specifically, the light-shielding curtain 3 includes a plurality of light-shielding plates arranged along the arc side of the skylight of the follow-up dome 1. In the extreme case, these light-shielding plates can be stacked at the bottom or top of the follow-up dome 1 according to different pitching angles of the telescope. The specific number of light-shielding plates can be determined according to the size of the follow-up dome 1. The larger the size of the follow-up dome 1, the more light-shielding plates.

[0036] In the embodiment of the present invention, only 4 light-shielding plates are taken as an example to introduce the stray light suppression effect of the light-shielding curtain 3. Specifically, the light-shielding curtain 3 includes a first light-shielding plate 31, a second light-shielding plate 32, a third light-shielding plate 33 and a fourth light-shielding plate 34. Among them, the first light-shielding plate 31 and the third light-shielding plate 33 are fixedly connected through a connecting rod 36. The distance between the first light-shielding plate 31 and the third light-shielding plate 33 is fixed, and the two are relatively stationary. The light-transmitting area 35 between the first light-shielding plate 31 and the third light-shielding plate 33 is adapted to the telescope aperture.

[0037] On one side of the light-transmitting area 35, the first light-shielding plate 31 and the second light-shielding plate 32 are laminated and slidably connected, that is, the first light-shielding plate 31 and the second light-shielding plate 32 can slide relative to each other and overlap, and even completely slide and hide inside the top of the follow-up dome 1.

[0038] On the other side of the light-transmitting area 35, the third light-shielding plate 33 and the fourth light-shielding plate 34 are laminated and slidably connected, that is, the third light-shielding plate 33 and the fourth light-shielding plate 34 can slide relative to each other and overlap, and even completely slide and hide inside the bottom of the follow-up dome 1.

[0039] The sliding connection structure between the first light-shielding plate 31 and the second light-shielding plate 32 is exactly the same as the sliding connection structure between the third light-shielding plate 33 and the fourth light-shielding plate 34. In the embodiment of the present invention, only the connection relationship between the first light-shielding plate 31 and the second light-shielding plate 32 is described as an example: The first light-shielding plate 31 is provided with pulleys at two apex angles far from the light-transmitting area 35, and a pair of slideways 37 along the sliding direction of the light-transmitting area 35 are provided at positions corresponding to the pulleys on both sides of the first light-shielding plate 31. Pulleys are provided at all four apex angles of the second light-shielding plate 32, and a pair of slideways 37 along the sliding direction of the light-transmitting area 35 are provided at positions corresponding to the pulleys on both sides of the second light-shielding plate 32. The pulleys of the first light-shielding plate 31 are embedded in the slideways 37 of the second light-shielding plate 32, and the pulleys of the second light-shielding plate 32 are embedded in the slideways 37 of the first light-shielding plate 31, so that the first light-shielding plate 31 and the second light-shielding plate 32 can overlap each other, reducing the coverage areas of the first light-shielding plate 31 and the second light-shielding plate 32, and even being completely hidden at the top of the follower dome 1. In addition, a limiting structure is provided at the proximal ends of the slideways 37 of the first light-shielding plate 31 and the second light-shielding plate 32 for interlocking to prevent the pulleys from disengaging from the slideways 37 and prevent light-transmitting slits from being formed between the first light-shielding plate 31 and the second light-shielding plate 32, thereby introducing additional stray light. The sliding connection situation between the third light-shielding plate 33 and the fourth light-shielding plate 34 is exactly the same as the above, and will not be elaborated here.

[0040] In order to adjust the position of the light-transmitting area 35, in the embodiment of the present invention, a driving mechanism is provided on the first light-shielding plate 31, and the driving power is provided by a driving motor with a sprocket installed on the output shaft. The movement of the driving motor is transmitted to the first light-shielding plate 31 through the cooperation of a chain and a sprocket, and the first light-shielding plate 31 is driven by the driving motor to move along the edge of the skylight of the follower dome 1. In addition, the first light-shielding plate 31 can also be driven to move in other ways.

[0041] Specifically, when the elevation angle of the telescope increases, the light transmission area 35 needs to move upward following the pointing direction of the telescope. Therefore, the driving mechanism drives the first light-shielding plate 31 to move upward along the slideway 37. During the upward movement of the first light-shielding plate 31 along the slideway 37, the first light-shielding plate 31 gradually overlaps with the lower layer of the second light-shielding plate 32. When the first light-shielding plate 31 is completely folded to the lower layer of the second light-shielding plate 32, the continuous upward movement of the first light-shielding plate 31 will push the second light-shielding plate 32 to move upward together until they are completely hidden in the non-light-transmitting area at the top of the follow-up dome 1. During this process, the first light-shielding plate 31 will simultaneously drive the third light-shielding plate 33 to move upward through the connecting rod 36, so as to ensure that the light transmission area 35 is aligned with the telescope aperture. Since a limiting structure is provided between the third light-shielding plate 33 and the fourth light-shielding plate 34, the interlocking of the third light-shielding plate 33 and the fourth light-shielding plate 34 is realized. Under the action of the limiting structure, the third light-shielding plate 33 and the fourth light-shielding plate 34 change from the overlapping state to the unfolded state. When completely unfolded, the third light-shielding plate 33 pulls the fourth light-shielding plate 34 to move upward from the bottom of the follow-up dome 1. It should be noted that when the light transmission area 35 moves to the maximum elevation angle, the lower end of the fourth light-shielding plate 34 is still inside the follow-up dome 1, that is, there is still an overlap between the fourth light-shielding plate 34 and the lower end of the skylight of the follow-up dome 1, and there is no light-transmitting slit.

[0042] When the elevation angle of the telescope decreases, the light transmission area 35 needs to move downward following the pointing direction of the telescope. Therefore, the driving mechanism drives the first light-shielding plate 31 to slide out from the lower layer of the second light-shielding plate 32. When the first light-shielding plate 31 completely slides out from the lower layer of the second light-shielding plate 32, that is, the first light-shielding plate 31 and the second light-shielding plate 32 completely change from the overlapping state to the unfolded state. The continuous downward movement of the first light-shielding plate 31 will pull the second light-shielding plate 32 to move downward together until the lower end of the light transmission area 35 moves to the lower end of the skylight of the follow-up dome 1. It should be noted that at this time, the light transmission area 35 moves to the minimum elevation angle state, and the upper end of the second light-shielding plate 32 is still inside the follow-up dome 1, that is, there is still an overlap between the second light-shielding plate 32 and the upper end of the skylight of the follow-up dome 1, and there is no light-transmitting slit. During this process, the first light-shielding plate 31 will simultaneously push the third light-shielding plate 33 to move downward through the connecting rod 36, and the third light-shielding plate 33 gradually overlaps with the fourth light-shielding plate 34. When the third light-shielding plate 33 completely overlaps with the fourth light-shielding plate 34, that is, the third light-shielding plate 33 is completely hidden in the lower layer of the fourth light-shielding plate 34, the first light-shielding plate 31 continues to push the third light-shielding plate 33 and the fourth light-shielding plate 34 to move downward until the third light-shielding plate 33 and the fourth light-shielding plate 34 are completely hidden in the non-light-transmitting area at the bottom of the follow-up dome 1.

[0043] Since the shading curtain 3 is provided in the skylight area of the follower dome 1 in the embodiments of the present invention, it will affect the airtightness of the follower dome 1, hinder the air flow, and cause the problem of wind-induced vibration in the light-transmitting area 35 and the telescope field-of-view aperture position, resulting in a decrease in the visual clarity of the light-transmitting area 35 and the telescope field-of-view aperture position. Therefore, the present invention optimizes the air permeability design of the shading curtain 3. Specifically, please refer to Figure 3 , each light-shielding plate in the light-shielding curtain 3 adopts a semi-permeable design. The light-shielding plate is a sandwich structure with two thin-walled skins in the middle. Each light-shielding plate includes transverse ribs 301 and arch ribs 302. The transverse ribs 301 and arch ribs 302 are periodically arranged to form a grid array. A semi-blind cylindrical ring 304 is provided in each grid 303, that is, a cylindrical concave hole is opened in the grid 303 divided by the transverse ribs 301 and arch ribs 302. The semi-blind cylindrical ring 304 includes a semi-blind cylindrical ring with only the upper bottom surface open, that is, the upper bottom surface of the cylindrical concave hole has no skin coverage, and the lower bottom surface has skin coverage, and a semi-blind cylindrical ring with only the lower bottom surface open, that is, the lower bottom surface of the cylindrical concave hole has no skin coverage, and the upper bottom surface has skin coverage. To balance the light-shielding property and air permeability, the semi-blind cylindrical rings with the upper bottom surface open and the semi-blind cylindrical rings with the lower bottom surface open are alternately distributed, and radial air holes are provided between adjacent semi-blind cylindrical rings. A certain amount of air flow can be allowed through the air holes, solving the problem of limited ventilation of the light-shielding plate without air holes, and at the same time avoiding the problem that directly opening air holes on the light-shielding plate will cause stray light to enter the interior of the follower dome 1.

[0044] As a preferred embodiment, since the design purpose of the shading curtain 3 is to attenuate stray light, an anti-glare coating can be provided on the inner surface of each light-shielding plate of the shading curtain 3, specifically by spraying a black anti-glare paint with a low reflectivity on the surface of the light-shielding plate facing the interior of the follower dome 1. At the same time, in order to prevent the shading curtain 3 from absorbing heat, a high-reflectivity coating can be sprayed on the outer surface of all light-shielding plates to avoid the design of the shading curtain 3 affecting the heat dissipation performance of the overall optical system.

[0045] In summary, the above description is only the preferred embodiments of this specification and is not used to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0046] The system, device, module or unit illustrated by the above one or more embodiments can be specifically implemented by a computer chip or an entity, or by a product with a certain function. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0047] It should also be noted that the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising said element.

[0048] Each embodiment in this specification is described in a progressive manner, and the same or similar parts among the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, they are described relatively simply, and the relevant parts can be referred to the description of the method embodiments.

[0049] The specific embodiments of this specification have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A telescope stray light suppression structure, characterized in that: include: A shade curtain provided at a telescope's follow-up dome skylight, the shade curtain comprising a plurality of shade plates arranged along the follow-up dome skylight, wherein two shade plates are fixedly connected by a connecting rod, a light-transmitting area adapted to the telescope aperture exists between the two shade plates, and adjacent shade plates on both sides of the light-transmitting area are laminated and slidably connected; When the light-through area slides along the follow-up dome skylight, the shading plates on one side of the light-through area overlap with each other to reduce the coverage area of ​​the shading plates on that side, and the shading plates on the other side of the light-through area expand with each other to increase the coverage area of ​​the shading plates on that side. The shading plates on both sides of the light-through area can be completely overlapped and hidden in the non-skylight area of ​​the follow-up dome. The sunshade includes: a square array formed by periodically arranging transverse ribs and arch ribs, each square is provided with a semi-blind cylindrical ring, the semi-blind cylindrical ring includes a semi-blind cylindrical ring with only an upper bottom surface opening and a semi-blind cylindrical ring with only a lower bottom surface opening, the semi-blind cylindrical rings with upper bottom surface openings and the semi-blind cylindrical rings with lower bottom surface openings are alternately distributed, and radial air holes are provided between adjacent semi-blind cylindrical rings.

2. The telescope stray light suppression structure according to claim 1, characterized in that: The follow-up dome has a sliding door for opening or closing the skylight.

3. The telescope stray light suppression structure according to claim 1, characterized in that: The blackout curtain is made of aluminum.

4. The telescope stray light suppression structure according to claim 1, characterized in that: The adjacent shading plates on both sides of the light-transmitting area are interlocked by a limiting structure to avoid the formation of light-transmitting slits between the adjacent shading plates.

5. The telescope stray light suppression structure according to claim 1, characterized in that: Two shading plates connected by a connecting rod are provided with pulleys at two vertex corners away from the light-passing area; and pulleys are provided at the four vertex corners of the remaining shading plates; A pair of slideways along the sliding direction of the light-passing area are provided on both sides of each shading plate; The adjacent shading plates on both sides of the light-through area are connected by pulleys embedded in the slideway.

6. The telescope stray light suppression structure according to claim 1, characterized in that: The surface of the blackout curtain facing the inner side of the follower dome is provided with a matte coating.

7. The telescope stray light suppression structure according to claim 1, characterized in that: The surface of the blackout curtain facing outward is provided with a high reflectivity coating.

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