Transmission-type low-temperature lens thermal unloading structure

Abstract

According to the transmission-type low-temperature lens thermal unloading structure provided by the invention, a flexible structure is adopted between a lens and a lens frame to be matched with low-temperature glue, and an unloading ring and Bipod laminated structure is adopted between lens groups, so that the surface shape and center deviation requirements of the whole lens assembly under low temperature and gravity are ensured. The main structure comprises a single-group lens assembly, a Bipod internal support, a support ring, an unloading ring and a Bipod external support. Each single lens assembly is composed of a lens, a lens unloading frame, an annular rubber pad and a pressing block. The single lens assembly is connected through an unloading ring and Bipod stacked structure, in order to ensure the mechanical property of the whole lens assembly, two supporting rings are added, and the overall rigidity is increased by reducing the span of Bipod; the external support of the whole lens assembly adopts a Bipod flexible support, so that the influence of the external support on the lens assembly at a low temperature is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of space optical remote sensors, and in particular relates to a transmission type low-temperature lens thermal unloading structure. Background Art

[0002] With the rapid development of space remote sensors, infrared detector technology is also improving day by day, and the temperature of the detected target is increasingly turning to deep low temperature. For infrared detection systems, thermal radiation is an important factor affecting the sensitivity of the system. In order to obtain good infrared detector sensitivity and imaging quality, cryogenic optical system is currently the most important method.

[0003] The optomechanical structure design of the cryogenic optical system must not only have sufficient rigidity and strength to ensure mechanical performance indicators such as gravity overload and fundamental frequency, but also require the lens to be able to unload the heat load caused by the temperature gradient within the system in a low-temperature environment to ensure good imaging quality.

[0004] Since cryogenic optical systems must follow the design principle of no heat effect, in order to achieve the need for heat unloading of cryogenic lens components in infrared optical systems, there are two common design ideas: one is to use the same material to ensure that the entire structure is proportionally scaled; the other is to use materials with matching thermal expansion coefficients and use flexible structural designs to achieve quasi-thermal design. In practical applications, it is often impossible to use the same material due to the needs of the optical system, and the actual needs can only be met through thermal matching and flexible unloading structure design. The traditional design method is to use thermal matching materials and flexible structure frame design, which has the disadvantages of heavy weight and difficult adjustment of the mirror spacing. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and provide a transmission type low temperature lens thermal unloading structure design, which improves the assembly accuracy and significantly reduces the structure weight while ensuring the mechanical properties and low temperature surface shape.

[0006] The technical solution of the present invention is:

[0007] The invention discloses a transmission type low temperature lens thermal unloading structure, comprising: a plurality of single-group lens assemblies, an unloading ring, a Bipod internal support, a support ring, a Bipod external support and an adjusting gasket; wherein the plurality of unloading rings are evenly distributed on the single-group lens assemblies; the single-group lens assemblies are respectively connected to the supporting rings through the Bipod internal support; the supporting ring is connected to the external interface through the Bipod external support; an adjusting gasket is arranged between each single-group lens assembly and the Bipod internal support, the thickness of the gasket is adjusted according to the installation and adjustment, and the lens spacing between each single-group lens assembly is adjusted.

[0008] Furthermore, in the above structure, the single-group lens assembly includes a lens unloading frame, a lens, a ring rubber pad, a pressure block, a lower rubber pad and a flexible ring structure; wherein the lens is adhesively connected to the flexible ring structure installed on the lens unloading frame through the ring rubber pad, and the lens is limited up and down by the pressure block, and the lower rubber pad is filled between the pressure block and the lens.

[0009] Furthermore, in the above structure, the Bipod internal support includes internal support one, internal support two, internal support three and internal support four; wherein, internal support one, internal support two, internal support three and internal support four have the same structure; internal support one includes two legs, a first support and two second supports; the ends of the two legs are connected and fixed to the single-group lens assembly through the first support; the other two ends of the two legs are respectively fixed to the support ring through two second supports.

[0010] Furthermore, in the above structure, the several single-group lens assemblies are lens assembly one, lens assembly two, lens assembly three, lens assembly four and lens assembly five; wherein, lens assembly one, lens assembly two, lens assembly three, lens assembly four and lens assembly five have the same structure.

[0011] Furthermore, in the above structure, the support ring includes: support ring 1 and support ring 2; wherein, support ring 1 connects lens assembly 1, lens assembly 2 and lens assembly 3 through internal support 1; support ring 2 connects lens assembly 4 and lens assembly 5 through internal support 2 and internal support 3 respectively.

[0012] Furthermore, in the above structure, the Bipod external support includes: external support one and external support two; external support one is connected to support ring one at one end and connected to the external structure at the other end; external support two is connected to support ring two and connected to the external structure at the other end.

[0013] Furthermore, in the above structure, the external support one includes a first connecting seat, a first supporting leg, a second supporting leg, a first supporting seat and a second supporting seat; wherein, a connecting through hole is provided on one end face of the first connecting seat and is connected to the supporting ring; the end of the first supporting leg is connected to the external interface through the first supporting seat, and the end of the second supporting leg is connected to the external interface through the second supporting seat.

[0014] Furthermore, in the above structure, the unloading ring includes a connecting flange, a connecting hole and a flexible groove; wherein the connecting flange is connected to the lens unloading frame, the connecting hole is connected to the internal support of the Bipod, and the flexible groove is an annular structure, which is placed on the connecting surface of the connecting flange and the connecting hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The transmission type cryogenic lens of the present invention adopts an open Bipod support form, which overcomes the closed barrel installation structure of the traditional transmission type lens, not only greatly reduces the weight of the entire lens group, but also more accurately and intuitively controls the lens spacing, and improves the installation accuracy;

[0017] (2) The transmission type low temperature lens of the present invention adopts a flexible unloading structure. Bipod supports are used between lens groups to avoid excessive span. A certain number of support rings are introduced as adapters. Through the flexible unloading rings, the surface shape and position accuracy requirements under various environmental conditions as well as the support stiffness, strength and vibration characteristics are guaranteed. The Bipod support uses the same material as the frame so that the low temperature mechanical properties should match the lens assembly. The structure adopts an integrated structure, and the flexible link adopts a two-stage flexible design, thereby ensuring the stiffness of the lens assembly and the low temperature unloading design requirements. The lens spacing is achieved by adjusting the gasket between the Bipod support and the frame;

[0018] (3) The transmission-type low-temperature lens of the present invention adopts a flexible unloading structure. The single-group lens assembly adopts a framing method of side direct bonding combined with flexible unloading. The flexible unloading adopts two links of structure and glue spot to realize thermal unloading, thereby ensuring the surface shape requirements of a single lens group under low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a diagram showing the composition of the transmission type cryogenic lens assembly of the present invention;

[0020] Figure 2 This is a connection diagram of the transmission type cryogenic lens assembly of the present invention;

[0021] Figure 3 It is a schematic diagram of a single lens assembly of the present invention;

[0022] Figure 4 It is a schematic diagram of a lens unloading frame of a single-group lens assembly of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the unloading ring of the present invention;

[0024] Figure 6 A schematic diagram of the internal support structure of the Bipod of the present invention;

[0025] Figure 7 Schematic diagram of the external support structure of the Bipod of the present invention. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings.

[0027] The invention discloses a transmission type low temperature lens thermal unloading structure, comprising: a plurality of single-group lens assemblies 1, an unloading ring 2, a Bipod internal support 3, a support ring 4, a Bipod external support 5 and an adjusting gasket 6; wherein the plurality of unloading rings 2 are evenly distributed on the single-group lens assemblies 1; the single-group lens assemblies 1 are respectively connected to the support rings 4 through the Bipod internal support 3; the support ring 4 is connected to an external interface through the Bipod external support 5; an adjusting gasket 6 is arranged between each single-group lens assembly 1 and the Bipod internal support 1, the gasket thickness is adjusted according to the installation and adjustment, and the lens spacing between each single-group lens assembly 1 is adjusted.

[0028] Preferably, a single-group lens assembly 1 includes a lens unloading frame 111, a lens 112, a ring rubber pad 113, a pressure block 114, a lower rubber pad 115 and a flexible ring structure 1111; wherein the lens 112 is adhesively connected to the flexible ring structure 1111 installed on the lens unloading frame 111 through the ring rubber pad 113, and the lens 112 is limited up and down by the pressure block 114, and the lower rubber pad 115 is filled between the pressure block 114 and the lens 112.

[0029] Preferably, the Bipod internal support 3 includes an internal support 1 31, an internal support 2 32, an internal support 33 and an internal support 4 34; wherein, the internal support 1 31, the internal support 2 32, the internal support 33 and the internal support 4 34 have the same structure; the internal support 1 31 includes two legs, a first support and two second supports; the ends of the two legs are connected and fixed to the single-group lens assembly 1 through the first support; the other two ends of the two legs are fixed to the support ring 4 through two second supports respectively.

[0030] Preferably, the plurality of single-group lens assemblies 1 are lens assembly 1 11, lens assembly 2 12, lens assembly 3 13, lens assembly 4 14 and lens assembly 5 15; wherein, lens assembly 1 11, lens assembly 2 12, lens assembly 3 13, lens assembly 4 14 and lens assembly 5 15 have the same structure.

[0031] Preferably, the support ring 4 comprises: a support ring 1 41 and a support ring 2 42; wherein, the support ring 1 41 is connected to the lens assembly 1 11, the lens assembly 2 12 and the lens assembly 3 13 through the internal support 1 31; the support ring 2 42 is connected to the lens assembly 4 14 and the lens assembly 5 15 through the internal support 2 32 and the internal support 3 33 respectively.

[0032] Preferably, the Bipod external support 5 comprises: an external support 1 51 and an external support 2 52; one end of the external support 1 51 is connected to the support ring 1 41, and the other end is connected to the external structure; the external support 2 52 is connected to the support ring 2 42, and the other end is connected to the external structure.

[0033] Preferably, the external support 51 includes a first connecting seat 501, a first supporting leg 502, a second supporting leg 504, a first supporting seat 503 and a second supporting seat 505; wherein, a connecting through hole is set on one end face of the first connecting seat 501 and connected to the support ring 4; the end of the first supporting leg 502 is connected to the external interface through the first supporting seat 503, and the end of the second supporting leg 504 is connected to the external interface through the second supporting seat 505.

[0034] Preferably, the unloading ring 2 includes a connecting flange 21, a connecting hole 22 and a flexible groove 23; wherein the connecting flange 21 is connected to the lens unloading frame 111, the connecting hole 22 is connected to the Bipod internal support 3, and the flexible groove 23 is an annular structure, which is placed on the connecting surface between the connecting flange 21 and the connecting hole 22.

[0035] Example

[0036] like Figure 1 As shown, the transmission type cryogenic lens assembly of the present invention comprises: a single lens assembly 1, an unloading ring 2, a Bipod internal support 3, a support ring 4, a Bipod external support 5 and an adjustment gasket 6;

[0037] like Figure 2 As shown, the single lens assembly 1 includes lens assembly 1 11, lens assembly 2 12, lens assembly 3 13, lens assembly 4 14, and lens assembly 5 15; the Bipod internal support 3 includes internal support 1 31, internal support 2 32, internal support 3 33, and internal support 4 34; the support ring 4 includes support ring 1 41 and support ring 2 42; the Bipod external support 5 includes external support 1 51 and external support 2 52;

[0038] like Figure 3 As shown, each lens assembly includes a lens unloading frame 111, a lens 112, a ring rubber pad 113, a pressing block 114, and a lower rubber pad 115; wherein the lens 112 in each lens group is connected to the lens unloading frame 111 by directly gluing the side of the ring rubber pad 113, and the lens is limited up and down by the pressing block 114, and the lower rubber pad 115 is pasted between the pressing block 114 and the lens 112.

[0039] like Figure 4 As shown, each lens unloading frame 111 includes 12 flexible ring structures 1111. The flexible ring structures ensure thermal unloading of the lens in a low temperature environment and reduce the influence of temperature on the low temperature surface shape of the lens.

[0040] like Figure 5 As shown, each unloading ring 2 includes a connecting flange 21, a connecting hole 22, and a flexible groove 23; wherein the connecting flange 21 is connected to the lens unloading frame 111, the connecting hole 22 is connected to the Bipod internal support 3, and the flexible groove 23 plays a stress unloading role in the connection between the single lens assemblies 1.

[0041] like Figure 6 As shown, the internal support 3 of the Bipod connects several single lens assemblies 1 in series, including the connection between a single lens assembly 1 and a support ring 4, and the connection between two support rings 4.

[0042] like Figure 7 As shown, the Bipod external support 5 includes a first connecting seat 501, a first supporting leg 502, a second supporting leg 504, a first supporting seat 503 and a second supporting seat 505; wherein the first connecting seat 501 is connected to the supporting ring 4; the ends of the first supporting leg 502 and the second support 504 are connected to the external interface.

[0043] The connection form of the entire lens assembly: the lens unloading frame 111 on a single lens assembly 1 is equipped with three unloading rings 2, and the function of the unloading ring 2 is to reduce the low-temperature stress caused by the connection between each lens group; in order to increase the rigidity of the entire lens assembly, two support rings 4 are added, and the single lens assembly is connected to the support ring 4 through the Bipod internal support 3 respectively, and the two support rings 4 are connected through the Bipod internal support 3; in order to ensure the spacing requirements between the lenses, the Bipod internal support 3 and the support ring 4 are ensured by an adjustment gasket 6 whose thickness and angle can be adjusted; the support ring 4 is connected to the Bipod external support 5, and the support legs of the Bipod external support 5 are connected to the external interface.

[0044] In order to ensure the thermal unloading design requirements of the lens assembly at low temperatures, the entire lens assembly, except for the lens 112 and the ring rubber pad 113, is made of the same metal material with a thermal expansion coefficient similar to that of the lens 112.

[0045] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A transmission type low temperature lens thermal unloading structure, characterized in that: include: A plurality of single-group lens assemblies (1), an unloading ring (2), a Bipod internal support (3), a support ring (4), a Bipod external support (5) and an adjustment gasket (6); wherein the plurality of unloading rings (2) are evenly distributed on the single-group lens assemblies (1); the single-group lens assemblies (1) are respectively connected to the support rings (4) via the Bipod internal support (3); the support ring (4) is connected to an external interface via the Bipod external support (5); an adjustment gasket (6) is provided between each single-group lens assembly (1) and the Bipod internal support (1); the gasket thickness is adjusted according to the assembly and adjustment, and the lens spacing between each single-group lens assembly (1) is adjusted.

2. A transmission type low temperature lens heat unloading structure according to claim 1, characterized in that: The single-group lens assembly (1) comprises a lens unloading frame (111), a lens (112), a ring rubber pad (113), a pressing block (114), a lower rubber pad (115) and a flexible ring structure (1111); wherein the lens (112) is adhesively connected to the flexible ring structure (1111) mounted on the lens unloading frame (111) via the ring rubber pad (113), and the lens (112) is limited in upper and lower positions via the pressing block (114), and the lower rubber pad (115) is filled between the pressing block (114) and the lens (112).

3. The transmission type low temperature lens heat unloading structure according to claim 1, characterized in that: The Bipod internal support (3) comprises an internal support one (31), an internal support two (32), an internal support three (33) and an internal support four (34); wherein the internal support one (31), the internal support two (32), the internal support three (33) and the internal support four (34) have the same structure; the internal support one (31) comprises two legs, a first support and two second supports; the ends of the two legs are connected and fixed to the single-group lens assembly (1) via the first support; the other two ends of the two legs are respectively fixed to the support ring (4) via the two second supports.

4. The transmission type low temperature lens heat unloading structure according to claim 1, characterized in that: A plurality of single-group lens assemblies (1) are lens assembly one (11), lens assembly two (12), lens assembly three (13), lens assembly four (14) and lens assembly five (15); wherein the lens assembly one (11), lens assembly two (12), lens assembly three (13), lens assembly four (14) and lens assembly five (15) have the same structure.

5. A transmission type low temperature lens heat unloading structure according to claim 4, characterized in that: The support ring (4) comprises: a support ring 1 (41) and a support ring 2 (42); wherein the support ring 1 (41) is connected to the lens assembly 1 (11), the lens assembly 2 (12) and the lens assembly 3 (13) via the internal support 1 (31); and the support ring 2 (42) is connected to the lens assembly 4 (14) and the lens assembly 5 (15) via the internal support 2 (32) and the internal support 3 (33).

6. The transmission type low temperature lens heat unloading structure according to claim 1, characterized in that: The Bipod external support (5) comprises: an external support 1 (51) and an external support 2 (52); one end of the external support 1 (51) is connected to the support ring 1 (41), and the other end is connected to the external structure; the external support 2 (52) is connected to the support ring 2 (42), and the other end is connected to the external structure.

7. A transmission type low temperature lens heat unloading structure according to claim 6, characterized in that: The external support (51) comprises a first connecting seat (501), a first supporting leg (502), a second supporting leg (504), a first supporting seat (503) and a second supporting seat (505); wherein a connecting through hole is provided on one end face of the first connecting seat (501) and is connected to the supporting ring (4); the end of the first supporting leg (502) is connected to the external interface via the first supporting seat (503), and the end of the second supporting leg (504) is connected to the external interface via the second supporting seat (505).

8. The transmission type low temperature lens heat unloading structure according to claim 2, characterized in that: The unloading ring (2) comprises a connecting flange (21), a connecting hole (22) and a flexible groove (23); wherein the connecting flange (21) is connected to the lens unloading frame (111), the connecting hole (22) is connected to the Bipod internal support (3), and the flexible groove (23) is an annular structure and is disposed on the connecting surface between the connecting flange (21) and the connecting hole (22).

Images