阅读说明：本技术 一种用于空间光学遥感器的调焦机构 (Focusing mechanism for space optical remote sensor ) 是由 赵海波 赵伟国 董吉洪 刘奉昌 于 2019-10-31 设计创作，主要内容包括：本发明涉及遥感器调焦技术领域,尤其涉及一种用于空间光学遥感器的调焦机构,包括：将丝杠和丝母设置在支撑座的内部,丝杠的另一端连接轴套,轴套与丝杠通过紧定螺钉固定,丝杠一端用深沟球轴承支撑,丝杠另一端用角接触轴承支撑,角接触轴承内部设置外环隔圈,两侧设置有轴承端盖,编码器与轴套配合连接并通过螺钉固定,调焦镜背部与调焦镜柔节胶结,调焦镜柔节通过螺钉固定在调焦镜架上,调焦镜架与调焦镜架固定装置通过螺钉连接,调焦镜架固定装置通过螺钉固定在直线轴承座上,直线轴承座内设置有至少两个直线轴承,直线轴承内部与光轴进行配合,光轴通过轴孔配合的方式安装在所述支撑座上,即有效实现高稳定性的调焦。(The invention relates to the technical field of remote sensor focusing, in particular to a focusing mechanism for a space optical remote sensor, which comprises: the lead screw and the screw are arranged inside the supporting seat, the other end of the lead screw is connected with the shaft sleeve, the shaft sleeve and the lead screw are fixed through a set screw, one end of the lead screw is supported by a deep groove ball bearing, the other end of the lead screw is supported by an angular contact bearing, an outer ring spacer ring is arranged inside the angular contact bearing, bearing end covers are arranged on two sides of the lead screw, the encoder is matched and connected with the shaft sleeve and fixed through screws, the back of the focusing lens is glued with the flexible joint of the focusing lens, the flexible joint of the focusing lens is fixed on the focusing lens frame through screws, the focusing lens frame is connected with a fixing device of the focusing lens frame through screws, the fixing device of the focusing lens frame is fixed on a linear bearing seat through screws, at least two linear bearings are arranged in the linear bearing seat, the inside of.)

1. A focusing mechanism for a space optical remote sensor comprises a lead screw and a nut which are arranged in a supporting seat, one end of the lead screw is connected with a motor through a coupler, the other end of the lead screw is fixedly connected with a shaft sleeve through a set screw, an encoder is matched and connected with the shaft sleeve and is fixed through a screw,

one end of the lead screw is supported by a deep groove ball bearing, the other end of the lead screw is supported by an angular contact bearing, the angular contact bearing is provided with an axial positioning device, the focusing lens is fixedly connected with the focusing lens fixing device through screws and is fixedly connected onto a linear bearing seat through the screws, at least two linear bearings are arranged in the linear bearing seat, the inside of each linear bearing is matched with the optical axis, and the optical axis is installed on the supporting seat in a shaft hole matching mode.

2. The focusing mechanism for a space optical remote sensor according to claim 1, wherein the supporting base is provided with at least two threaded holes at the positions where the optical axis is installed in the axial hole, and at least two set screws are arranged in each threaded hole.

3. The focusing mechanism for a space optical remote sensor according to claim 1, wherein the focusing lens fixing means comprises a focusing lens flexible section, a focusing lens frame, a nut flexible section and at least two lapping pads, and the nut flexible section is provided with flexible grooves in different directions.

4. The focusing mechanism for a spatial optical remote sensor according to claim 1, wherein the encoder has a first encoder shield and a second encoder shield, the first encoder shield is fixed to the second encoder shield by screws, the second encoder shield is fixed to the support base by set screws, and the first encoder shield and the second encoder shield are made of a metal material having a thickness of not less than 3 mm.

5. The focusing mechanism for a space optical remote sensor according to claim 1, wherein a light shield is fixedly disposed outside the focusing lens.

6. The focusing mechanism for a space optical remote sensor as claimed in claim 1, wherein the axial positioning means are an outer ring spacer disposed inside the angular contact bearing and bearing end caps disposed at both sides of the angular contact bearing, and the angular contact bearings are a pair, and are pre-tightened by the lock nut in a back-to-back assembly.

7. A focusing mechanism for a space optical remote sensor as claimed in claim 1 wherein a spring collar is provided within the linear bearing mount.

8. A focusing mechanism for a space optical remote sensor as claimed in claim 3 wherein the focusing lens flexure is provided with a cylindrical pin.

9. A focusing mechanism for a space optical remote sensor according to claim 1, wherein the optical axis or the nut is provided with a limit.

Technical Field

The invention belongs to the technical field of remote sensor focusing, and particularly relates to a focusing mechanism for a space optical remote sensor.

Background

The space optical remote sensor is used for carrying out detailed investigation and general investigation on earth and space resources, and has important scientific and military significance in the fields of earth observation, space exploration and the like. As a precise optical system, the space optical remote sensor has strict requirements on the relative positions of the respective optical elements. Differences exist among the installation and adjustment environment, the calibration environment and the track working environment of the space optical remote sensor on the ground, such as changes of atmospheric pressure, temperature and object distance, and the like, and the image plane position of the optical system of the deep space detection remote sensing camera deviates from a focal plane due to the differences, namely, a defocusing phenomenon is generated; in addition, vibration and impact force in the transmitting process of the space optical remote sensor, material stress after entering a track, gravity rebound and the like can cause the defocusing phenomenon of an optical system of the deep space detection remote sensing camera, the defocusing phenomenon can seriously affect the imaging quality of the space remote sensing camera, and in order to ensure the imaging quality of the camera and obtain an image with the optimal resolution, the defocusing must be compensated, namely, an image plane of the optical system is adjusted to a target surface of a photosensitive element through a focusing mechanism.

As a key component of a space optical remote sensor, the performance of a focusing mechanism directly determines the imaging quality of a camera, and the success or failure of a detection task is influenced. In recent years, with the continuous development of deep space exploration, more rigorous requirements are put on a focusing mechanism, the focusing mechanism not only needs to have high precision, but also needs to have high stability to adapt to increasingly complex and changeable external environments, and the high stability of the focusing mechanism can still maintain the original precision and rigidity under the conditions that the focusing mechanism undergoes focusing movement and external interference.

Most of traditional focusing mechanisms are researched aiming at the instability problem caused by temperature, a flexible link is arranged on an optical element supporting assembly, the focusing instability caused by the processing error of key parts of the focusing mechanism, the assembly residual error of the key parts, the gaps of all movable parts, the shaking in the motion process and the like is less researched, and the existence of the factors can enable the focusing mechanism to generate larger internal stress, so that the stability of the focusing mechanism is influenced.

Disclosure of Invention

The invention aims to provide a space optical remote sensor and a high-stability focusing mechanism thereof, and aims to solve the problem of unstable performance of the focusing mechanism caused by machining errors, assembly residual errors of components, gaps of all movable components and shaking in the motion process in the prior art.

The embodiment of the invention provides a focusing mechanism for a space optical remote sensor, which comprises a motor, a motor base, a coupler, a supporting base, a lead screw, a nut, an encoder, an angular contact bearing, a focusing lens flexible joint, a focusing lens frame, a linear bearing seat, a linear bearing, a screw, a shaft sleeve, a deep groove ball bearing, a bearing end cover, a set screw, a focusing lens frame fixing device and an optical axis, wherein one end of the lead screw is connected with the motor through the coupler, the motor is fixedly connected with the motor base, the supporting base is a main supporting structure of the whole focusing mechanism and is used for bearing and connecting an optical and transmission assembly, the lead screw and the nut are arranged inside the supporting base and are used for converting the rotary motion of the motor into linear motion, the other end of the lead screw is connected with the shaft sleeve, the shaft sleeve and the lead screw are fixed through the set screw, one end of the lead screw is supported, the other end of the lead screw is supported by an angular contact bearing, the angular contact bearing is provided with an axial positioning device, and the axial positioning device is used for axially positioning the angular contact bearing.

The encoder is connected with the shaft sleeve in a matched mode and fixed through screws, the rotation angle of the lead screw can be fed back accurately by the encoder, and a sensing link is provided for closed-loop control of the focusing mechanism.

The back of the focusing lens is connected with the focusing lens fixing device through screws and is fixedly connected onto the linear bearing seat through screws, at least two linear bearings are arranged in the linear bearing seat, the interior of each linear bearing is matched with the optical axis, the optical axis is installed on the supporting seat in a shaft hole matched mode, and the linear bearings and the optical axis are combined to realize the guiding of the focusing mechanism.

Further, the position of shaft hole installation optical axis on the supporting seat is provided with two at least screw holes, sets up two at least holding screw in every screw for finely tune the position of optical axis on the supporting seat, and two holding screw of continuous use have the function of relaxing, and the point is glued fixedly after adjusting.

Furthermore, the focusing lens fixing device comprises a focusing lens flexible joint, a focusing lens frame, a screw flexible joint and at least two repairing and grinding pads, the focusing lens is connected with the focusing lens flexible joint in a gluing mode, the focusing lens flexible joint is used for adapting to the position and surface shape change of the focusing lens caused by temperature change, the focusing lens flexible joint is fixed on the focusing lens frame through screws, flexible grooves in different directions are formed in the screw flexible joint and used for releasing focusing mechanism instability caused by non-coplanar errors and non-coaxial errors when the focusing lens frame, the screw flexible joint and the repairing pads are connected.

Further, the encoder has first encoder protection casing and second encoder protection casing, first encoder protection casing passes through the fix with screw on the second encoder protection casing, the second encoder protection casing passes through holding screw to be fixed on the supporting seat, first encoder protection casing and second encoder protection casing adopt thickness not less than 3 mm's metal material to make, are used for protecting the encoder to avoid the influence of space strong radiation.

Furthermore, a light shield is fixedly arranged outside the focusing lens and used for eliminating stray light.

Further, the axial positioning device comprises an outer ring spacer ring arranged in the angular contact bearing and bearing end covers arranged on two sides of the angular contact bearing, the angular contact bearings are in a pair, a back-to-back assembly mode is adopted, and pre-tightening is carried out through the locking nut.

Furthermore, a spring collar is arranged in the linear bearing seat and used for axially fixing the linear bearing seat.

Further, the focusing mirror flexible adjustment is provided with a cylindrical pin for positioning the focusing mirror flexible adjustment.

Furthermore, limiting blocks are arranged at two ends of the optical axis and used for axially positioning the optical axis.

Furthermore, screw limiting blocks are arranged on two sides of the screw and used for mechanically limiting the focusing mechanism.

Compared with the prior art, the high-stability focusing mechanism of the space optical remote sensor further comprises a shaft sleeve, a bearing end cover, a set screw, a focusing mirror frame fixing device, an optical shaft and a deep groove ball bearing, wherein the position of the optical shaft arranged on a shaft hole on a supporting seat is provided with at least two threaded holes, at least two set screws are arranged in each threaded hole and used for finely adjusting the position of the optical shaft on the supporting seat, the two set screws are continuously used for having a loosening function, and after the adjustment is finished, the adhesive dispensing and the fixing are carried out, so that the assembly residual error of the optical shaft on the supporting seat, the clearance of each movable part and the shake generated in the motion process are reduced, the focusing mirror frame fixing device comprises a nut flexible joint and at least two repairing and grinding pads, flexible grooves in different directions are arranged on the nut flexible joint and used for reducing the instability of the focusing mechanism caused by non-coplanarity error and non-axis error when the focusing mirror frame, through further mechanical limitation and focusing guide of the focusing mechanism by the components, high-stability focusing is effectively realized.

Drawings

FIG. 1 is a schematic top view of a focusing mechanism for a space optical remote sensor in an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic sectional view taken along line B-B of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 2;

fig. 5 is a schematic structural diagram of a nut flexible joint provided with a flexible groove in the embodiment of the invention.

The device comprises a lens hood 1, a lens hood 2, a focusing mirror frame 3, a supporting seat 4, a coupler 5 and a motor base; 6. the device comprises a motor, 7, a limiting block, 8, an optical shaft, 9, a linear bearing, 10, a linear bearing seat, 11, a spring collar, 12, a first encoder protective cover, 13, an encoder, 14, a shaft sleeve, 15, a set screw, 16, a deep groove ball bearing, 17, a second encoder protective cover, 18, a focusing lens, 19, a focusing lens flexible joint, 20, a screw, 21, a pin, 22, a first nut limiting block, 23, a nut flexible joint, 24, a lead screw, 25, a repairing and grinding pad, 26, a nut, 27, a second nut limiting block, 28, a first bearing end cover, 29, an angular contact bearing, 30, an outer ring spacer, 31, a locking nut, 32, a second bearing end cover, 3-1, a front end longitudinal screw hole, 3-2, a front end transverse screw hole, 3-3, a rear end longitudinal screw hole, 3-4, a rear end transverse screw hole, 23-1 and a flexible groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, it should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative concepts or reference to the normal use state of the product, and should not be considered as limiting. The following describes the implementation of the present invention in detail with reference to specific embodiments.

As shown in fig. 1 to 5, an embodiment of the present invention provides a focusing mechanism for a space optical remote sensor, including a support base 3, a lead screw 24 and a nut 26 are disposed inside the support base, one end of the lead screw 24 is connected to a motor 6 through a coupling 4, the other end of the lead screw 24 is connected to a shaft sleeve 14, the shaft sleeve 14 and the lead screw 24 are fixed by a set screw 15, the front end of the lead screw 24 is supported by a deep groove ball bearing 16, the rear end is supported by an angular contact bearing 29, an outer ring spacer 30 is disposed inside the angular contact bearing 29, a first bearing end cover 28 and a second bearing end cover 32 are disposed on both sides of the angular contact bearing 29, an encoder 13 is connected to the shaft sleeve 14 in a matching manner and fixed by screws, the back of a focusing lens 18 is connected to a focusing lens flexible joint 19 in a gluing manner, the focusing lens flexible joint 19 is fixed to a focusing lens frame 2 by screws and, focusing mirror holder 2 passes through the screw connection with focusing mirror holder fixing device, and focusing mirror holder fixing device passes through the fix with screw on sharp bearing frame 10, is provided with two linear bearing 9 in the sharp bearing frame 10 to be provided with spring rand 11 and carry out axial fixity, linear bearing 9 is inside to cooperate with optical axis 8, optical axis 8 is installed on supporting seat 3 through shaft hole complex mode, and is provided with the stopper at optical axis 8's both ends and carries out axial positioning to optical axis 8, can realize the purpose of high stability focusing.

As shown in fig. 1 to 5, the focusing frame fixing device in this embodiment includes a nut flexible joint 23 and two grinding pads 25, the nut flexible joint 23 and the two grinding pads 25 are fixedly connected by screws, and the grinding pads 25 are fixedly disposed on the linear bearing seat 10, so that the focusing stability of the focusing lens can be improved.

In this embodiment, a plurality of threaded holes are provided near the position of the optical axis 8 mounted in the shaft hole of the support base 3, which are respectively a front end two longitudinal screw holes 3-1 and two transverse screw holes 3-2, a rear end two longitudinal screw holes 3-3 and two transverse screw holes 3-4, the front end longitudinal screw hole 3-1 is vertically distributed with the front end transverse screw hole 3-2, the rear end longitudinal screw hole 3-3 is vertically distributed with the rear end transverse screw hole 3-4, two set screws 15 are provided in each screw hole for fine adjustment of the position of the optical axis 8 on the support base 3, and two set screws 15 are continuously used, so that the function of loosening is realized, the glue is dispensed and fixed after adjustment, the assembly residual error of the optical axis on the supporting seat, the clearance of each movable part and the shaking in the motion process can be effectively reduced, and the focusing stability is improved.

In this embodiment, the nut flexible joint 23 is preferably provided with a longitudinal and transverse flexible groove 23-1 for releasing instability of the focusing mechanism caused by non-coplanar errors and non-coaxial errors when the focusing frame 2, the nut flexible joint 23 and the grinding pad 25 are connected, thereby effectively improving stability of focusing.

In this embodiment, the encoder 13 has a first encoder protective cover 12 and a second encoder protective cover 17, the second encoder protective cover 17 is fixed on the supporting base 3 through screws 15, the first encoder protective cover 12 is fixed on the second encoder protective cover 17 through screws 20, the first encoder protective cover 12 and the second encoder protective cover 17 are made of a metal material with a thickness of not less than 3mm, preferably a metal such as lead, steel or chrome, and are used for protecting the encoder 13 from strong space radiation.

In the present embodiment, the light shield 1 is disposed around the focusing lens 18 to eliminate stray light.

In the present embodiment, the angular bearings 29 are a pair, and are assembled back to back, and are pre-tightened by the lock nuts 31.

In this embodiment, a first nut limiting block 22 and a second nut limiting block 27 are disposed on two sides of the nut, and are used for mechanically limiting the focusing mechanism.

In another embodiment of the present invention, a plurality of threaded holes are disposed near the position of the optical axis 8 mounted in the shaft hole of the support base 3, and are distributed in different directions along the tangent plane of the optical axis 8, and at least two set screws are disposed in each threaded hole for fine adjustment of the position of the optical axis 8 on the support base 3, so as to effectively reduce the assembly residual error of the optical axis on the support base, the gap between each movable component and the shake occurring during the movement, and improve the stability of focusing.

The above-mentioned embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications, substitutions and improvements within the technical scope of the present invention, and these modifications, substitutions and improvements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.