Pop-up light shield based on memory metal spring

Abstract

The invention discloses a pop-up light shield based on a memory metal spring, and relates to the technical field of optical system light shields, the pop-up light shield comprises a fixed cover and a pop-up cover, the end part of one side of the fixed cover is provided with a plurality of mounting plates, and the plurality of mounting plates are uniformly arranged along the outer circumference of the fixed cover; a plurality of first limiting flanges are arranged at the end part of the other side of the fixed cover; a plurality of limiting guide rails are arranged on the inner wall of the pop-up cover, and each limiting guide rail is in sliding connection with the corresponding first limiting flange; the side face, close to the pop-up cover, of the mounting plate is connected with the end, away from the fixed cover, of the pop-up cover through a memory metal spring, the memory metal spring is arranged in a heating pipe in a sleeved mode, one end of the heating pipe is connected with the mounting plate, and the other end of the heating pipe is bonded to the pop-up cover. The self-unfolding mode of the memory metal spring is adopted, the structure is simple, deployment is convenient, and good movement stability and high unfolding precision are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of optical system sunshades, and in particular to a pop-up sunshade based on a memory metal spring. Background Art

[0002] For the imaging system of space remote sensors, the intrusion of sunlight can cause problems such as stray light and heat flow, affecting the imaging quality of the optical system. When stray light enters the optical system, it passes through the primary and secondary reflectors and finally reaches the focal plane of the camera, which will cause the target signal-to-noise ratio of the optical system to decrease, and the final imaging quality to deteriorate; the heat flow will destroy the thermal balance in the camera, causing thermal deformation of structural parts and optical components, affecting the accuracy of the optical system, and thus causing the imaging quality to deteriorate.

[0003] In order to eliminate the interference of sunlight on the optical imaging system, an effective method often used is to install a sunshade at the aperture. The sunshade is an important component of the optical system and a conventional measure for the system to suppress stray light. It is used to block the light beam outside the field of view from entering the optical system, reduce the harm of stray light to the system imaging, and thus improve the quality of the system imaging.

[0004] Existing deployable sunshades include various types such as mechanical deployable, inflatable deployable and self-deployable, but most of them have complex structures, require additional drives, are heavy, have large radial dimensions, and have relatively limited use conditions.

[0005] Therefore, those skilled in the art provide a pop-up sunshade based on a memory metal spring to solve the problems raised in the above background technology. Summary of the invention

[0006] The present invention provides a solution to the above-mentioned problem. A spring made of memory alloy is used as a power source. The spring is heated by an electric heating wire to restore it to an extended state, thereby popping open the light shield. The pop-up light shield can effectively reduce the volume of the camera when it is not working, which is beneficial to the internal layout of the spacecraft and reduces the space required for launch. A pop-up light shield based on a memory metal spring.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A pop-up light shield based on a memory metal spring of the present invention comprises:

[0009] A fixed cover, wherein one end of the fixed cover has a plurality of mounting plates, the plurality of mounting plates are evenly arranged along the outer circumference of the fixed cover, and the other end of the fixed cover has a plurality of first limiting flanges;

[0010] A pop-up cover, wherein the inner wall of the pop-up cover has a plurality of position-limiting guide rails, each of which is slidably connected to a corresponding first position-limiting flange;

[0011] The side of the mounting plate close to the pop-up cover and the end of the pop-up cover away from the fixed cover are connected through a memory metal spring. The memory metal spring is sleeved in the heating tube. One end of the heating tube is connected to the mounting plate, and the other end of the heating tube is bonded to the pop-up cover.

[0012] The number of the heating tubes and the memory metal springs are both two, and they are symmetrically arranged on both sides of the fixed cover. The two memory metal springs are connected to the corresponding mounting plates respectively, and the remaining mounting plates are used for the mounting structure of the fixed cover.

[0013] Furthermore, a base is installed on the side of the mounting plate away from the memory metal spring, two power supply interfaces are arranged on the outer side of the base, and one end of the heating tube passes through the mounting plate and is connected to the base.

[0014] Furthermore, a heating wire is arranged in the heating tube, the heating wire is electrically connected to one of the power supply interfaces, and the other end of the heating wire extends to the end of the heating tube.

[0015] Furthermore, another power interface is electrically connected to the heating tube.

[0016] Furthermore, the inner wall of the pop-up cover is provided with a plurality of annular support plates, the plurality of limiting guide rails are evenly fixed on the inner walls of the plurality of annular support plates, and each limiting guide rail is connected to the inner walls of the plurality of annular support plates.

[0017] Furthermore, an annular baffle is provided on the end of the pop-up cover away from the mounting plate, and a plurality of second limiting flanges are provided on the end of the pop-up cover close to the mounting plate, each of the second limiting flanges is connected to the end of the corresponding limiting guide rail, and the end of the second limiting flange away from the pop-up cover is located on the inner side of the corresponding limiting guide rail.

[0018] Furthermore, a first through hole is provided on each of the two second limiting flanges, and the two first through holes are symmetrically arranged inside the pop-up cover. Second through holes are provided at positions corresponding to the first through holes on multiple annular support plates, and when the pop-up cover is set on the fixed cover, the heating tube is located in the corresponding first through hole and the second through hole.

[0019] Furthermore, the portion of the fixing cover between two adjacent mounting plates is recessed inward to form a groove, and the groove is arranged on the fixing cover near the end of the mounting plate.

[0020] In the above technical solution, the present invention provides a pop-up sunshade based on a memory metal spring, which has the following beneficial effects:

[0021] 1. This application adopts the self-expanding method of memory metal spring, which has simple structure, convenient deployment, good motion stability and high expansion accuracy;

[0022] 2. The present application greatly reduces the initial volume of the sunshade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A schematic diagram of the structure of a pop-up light shield based on a memory metal spring when it is unfolded provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a pop-up light shield based on a memory metal spring in another direction when it is unfolded according to an embodiment of the present invention;

[0026] Figure 3 for Figure 1 A cross-sectional view of

[0027] Figure 4 for Figure 1 A schematic diagram of the structure of the ejection cover;

[0028] Figure 5 for Figure 1 A schematic diagram of the structure of the fixed cover;

[0029] Figure 6 for Figure 1 Schematic diagram of the connection mechanism between the middle base and the heating tube;

[0030] Figure 7 for Figure 6 A cross-sectional view of

[0031] Figure 8 A cross-sectional view of a pop-up light shield based on a memory metal spring provided by an embodiment of the present invention when not deployed.

[0032] Description of reference numerals:

[0033] 10. Fixed cover; 11. Mounting plate; 12. First limit flange; 13. Base; 14. Power interface; 15. Groove;

[0034] 20. Pop-up cover; 21. Position-limiting guide rail; 22. Annular support plate; 23. Annular baffle; 24. Second position-limiting flange; 25. First through hole;

[0035] 30. Memory metal spring; 31. Heating tube; 32. Heating wire. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] See also Figure 1-5 As shown;

[0038] A pop-up light shield based on a memory metal spring according to an embodiment of the present invention comprises:

[0039] A fixed cover 10, wherein one end of the fixed cover 10 has a plurality of mounting plates 11, and the plurality of mounting plates 11 are evenly arranged along the outer circumference of the fixed cover 10, and the other end of the fixed cover 10 has a plurality of first limiting flanges 12;

[0040] A pop-up cover 20, wherein the inner wall of the pop-up cover 20 has a plurality of position limiting guide rails 21, and each position limiting guide rail 21 is slidably connected to a corresponding first position limiting flange 12;

[0041] The side of the mounting plate 11 close to the pop-up cover 20 and the end of the pop-up cover 20 away from the fixed cover 10 are connected through a memory metal spring 30. The memory metal spring 30 is sleeved in a heating tube 31. One end of the heating tube 31 is connected to the mounting plate 11, and the other end of the heating tube 31 is bonded to the pop-up cover 20.

[0042] The number of the heating tubes 31 and the memory metal springs 30 are both two, and they are symmetrically arranged on both sides of the fixed cover 20. The two memory metal springs 30 are respectively connected to the corresponding mounting plates 11, and the remaining mounting plates 11 are used for the mounting structure of the fixed cover 10. The heating tubes 31 can be copper tubes.

[0043] During specific operation, the heating tube 31 is heated to separate the bonding portion of the heating tube 31 and the pop-up cover 20, and then the pop-up cover 31 is popped out under the action of the memory metal spring 30. During the pop-up process, the first limiting flange 12 can slide along the corresponding limiting guide rail 21. The above-mentioned overall structure is simple, which can effectively reduce the volume of the camera when it is not working, which is beneficial to the internal layout of the spacecraft and reduces the space required for launch.

[0044] See also Figure 1-7 As shown;

[0045] Furthermore, a base 13 is installed on the side of the mounting plate 11 away from the memory metal spring 30 , and two power supply interfaces 14 are arranged on the outer side of the base 13 . One end of the heating tube 31 passes through the mounting plate 11 and is connected to the base 13 .

[0046] Furthermore, a heating wire 32 is disposed in the heating tube 31 . The heating wire 32 is electrically connected to one of the power interfaces 14 . The other end of the heating wire 32 extends to the end of the heating tube 31 .

[0047] Furthermore, the other power interface 14 is electrically connected to the heating tube 31 .

[0048] When the pop-up cover 20 needs to be popped out, power is supplied through the power interface 14, and the heating wire 32 connected thereto is heated, so that the heating tube 31 is separated from the bonding portion of the pop-up cover 20, and the pop-up cover 20 is smoothly popped out. Meanwhile, during the pop-up process, the heating tube 31 can be used as a guide rod for the pop-up cover 20 to avoid the pop-up being affected by the deflection of the pop-up cover 20.

[0049] Furthermore, the inner wall of the pop-up cover 20 is provided with a plurality of annular support plates 22 , the plurality of limiting guide rails 21 are evenly fixed on the inner walls of the plurality of annular support plates 22 , and each limiting guide rail 21 is connected to the inner walls of the plurality of annular support plates 22 .

[0050] The pop-up cover 20 uses multiple annular support plates 22 to fix multiple limiting guide rails 21, that is, a space is formed between the pop-up cover 20, the annular support plates 22 and the limiting guide rails 21 to reduce the overall weight and facilitate popping out.

[0051] Furthermore, an annular baffle 23 is provided on the end of the pop-up cover 20 away from the mounting plate 11, and a plurality of second limiting flanges 24 are provided on the end of the pop-up cover 20 close to the mounting plate 11, each of the second limiting flanges 24 is connected to the end of the corresponding limiting guide rail 21, and the end of the second limiting flange 24 away from the pop-up cover 20 is located on the inner side of the corresponding limiting guide rail 21.

[0052] When the pop-up cover 20 is not popped out, the end of the heating tube 31 is bonded to the inner side of the annular baffle 23; when the pop-up cover 20 is popped out, the second limiting flange 24 on the pop-up cover 20 abuts against the corresponding first limiting flange 12 on the fixed cover 10 to prevent the pop-up cover 20 from separating from the fixed cover 10.

[0053] Furthermore, a first through hole 25 is provided on each of the two second limiting flanges 24, and the two first through holes 25 are symmetrically arranged inside the pop-up cover 20. Second through holes are provided at positions corresponding to the first through holes 25 on the plurality of annular support plates 22. When the pop-up cover 20 is sleeved on the fixed cover 10, the heating tube 31 is located in the corresponding first through hole 25 and the second through hole.

[0054] When the pop-up cover 20 has not popped out, the heating tube 31 passes through the corresponding first through hole 25 and multiple second through holes and is bonded to the annular baffle 23, which can ensure the coaxiality of the pop-up cover 20 and the fixed cover 10; after the pop-up cover 20 pops out, that is, after the heating tube 31 is separated from the annular baffle 23, the heating tube 31 cooperates with the first through hole 25 and multiple second through holes to guide the pop-up direction of the pop-up cover 20, thereby improving the deployment accuracy.

[0055] Furthermore, the portion of the fixed cover 10 between two adjacent mounting plates 11 is recessed inward to form a groove 15. The groove 15 is arranged on the fixed cover 10 near the end of the mounting plate 11. The design of multiple grooves 15 can effectively reduce the weight of the fixed cover 10.

[0056] During specific installation, the first limiting flange 12 on the fixed cover 10 enters the pop-up cover 20 from between two adjacent limiting guide rails 21 and rotates, so that the first limiting flange 12 cooperates with the limiting guide rail 21, and the second limiting flange 24 cooperates with the outer wall of the fixed cover 10. The second limiting flange 24 is engaged with the first limiting flange 12 to determine the movable range of the pop-up cover 20, and then the heating tube 31 is passed through the holes on the mounting plate 11, the first through hole 25 and the corresponding multiple second through holes in sequence, and finally bonded to the annular baffle 23. At the same time, the two ends of the memory metal spring 30 are respectively bonded to the annular baffle 23 and the mounting plate 11 by heat-resistant adhesive, and the base 13 and the mounting plate 11 are also bonded by heat-resistant adhesive; when the pop-up cover 20 pops out, the heat of the heating wire 32 is radiated to the outer memory metal spring 30 through the heating tube 31.

[0057] The stable state of the memory metal spring 30 of the present application is the extended state. Since the memory metal spring 30 has the characteristic of restoring the stable state shape when the temperature reaches above the memory temperature, this characteristic can be used as a power source for the pop-up cover 20 to unfold. When installing, press the pop-up cover 20 to the retracted position (such as Figure 8 When the camera reaches the working position, the heating wire 31 heats the memory metal spring 30 so that its temperature reaches above the memory temperature, the memory metal spring 30 stretches to a stable state, and the pop-up cover 20 reaches the working position.

[0058] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pop-up sunshade based on a memory metal spring, characterized in that: include: A fixed cover (10), wherein one end of the fixed cover (10) has a plurality of mounting plates (11), the plurality of mounting plates (11) are evenly arranged along the outer circumference of the fixed cover (10), and the other end of the fixed cover (10) has a plurality of first limiting flanges (12); A pop-up cover (20), wherein the inner wall of the pop-up cover (20) has a plurality of position-limiting guide rails (21), and each position-limiting guide rail (21) is slidably connected to a corresponding first position-limiting flange (12); The side surface of the mounting plate (11) close to the pop-up cover (20) and connected to one end of the pop-up cover (20) away from the fixed cover (10) through a memory metal spring (30), the memory metal spring (30) is sleeved in a heating tube (31), one end of the heating tube (31) is connected to the mounting plate (11), and the other end of the heating tube (31) is bonded to the pop-up cover (20); The number of the heating tubes (31) and the memory metal springs (30) is two each, and they are symmetrically arranged on both sides of the fixed cover (20). The two memory metal springs (30) are respectively connected to the corresponding mounting plates (11), and the remaining mounting plates (11) are used for the mounting structure of the fixed cover (10).

2. The pop-up visor based on a memory metal spring according to claim 1, characterized in that: A base (13) is installed on the side of the mounting plate (11) away from the memory metal spring (30), two power supply interfaces (14) are arranged on the outer side of the base (13), and one end of the heating tube (31) passes through the mounting plate (11) and is connected to the base (13).

3. The pop-up visor based on a memory metal spring according to claim 2, characterized in that: A heating wire (32) is arranged inside the heating tube (31), the heating wire (32) is electrically connected to one of the power supply interfaces (14), and the other end of the heating wire (32) extends to the end of the heating tube (31).

4. The pop-up visor based on a memory metal spring according to claim 3, characterized in that: The other power interface (14) is electrically connected to the heating tube (31).

5. The pop-up visor based on a memory metal spring according to claim 1, characterized in that: The inner wall of the pop-up cover (20) is provided with a plurality of annular support plates (22), the plurality of position limiting guide rails (21) are evenly fixed on the inner walls of the plurality of annular support plates (22), and each position limiting guide rail (21) is connected to the inner walls of the plurality of annular support plates (22).

6. The pop-up visor based on a memory metal spring according to claim 5, characterized in that: An annular baffle (23) is provided on the end of the pop-up cover (20) away from the mounting plate (11), and a plurality of second limiting flanges (24) are provided on the end of the pop-up cover (20) close to the mounting plate (11), each of the second limiting flanges (24) is connected to the end of a corresponding limiting guide rail (21), and the end of the second limiting flange (24) away from the pop-up cover (20) is located on the inner side of the corresponding limiting guide rail (21).

7. The pop-up visor based on a memory metal spring according to claim 6, characterized in that: The two second limiting flanges (24) are each provided with a first through hole (25), the two first through holes (25) are symmetrically arranged inside the pop-up cover (20), and the plurality of annular support plates (22) are each provided with a second through hole at a position corresponding to the first through hole (25), and when the pop-up cover (20) is sleeved on the fixed cover (10), the heating tube (31) is located in the corresponding first through hole (25) and the second through hole.

8. The pop-up visor based on a memory metal spring according to claim 1, characterized in that: The portion of the fixed cover (10) located between two adjacent mounting plates (11) is recessed inward to form a groove (15), and the groove (15) is arranged on the fixed cover (10) at an end close to the mounting plate (11).

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