CN217181334U

CN217181334U - Multilayer optical filter switching device for large-aperture photoelectric telescope

Info

Publication number: CN217181334U
Application number: CN202220439854.XU
Authority: CN
Inventors: 张聪聪; 慎露润; 郑立新; 陈振东; 周丹
Original assignee: Shanghai Astronomical Observatory of CAS
Current assignee: Shanghai Astronomical Observatory of CAS
Priority date: 2022-03-02
Filing date: 2022-03-02
Publication date: 2022-08-12
Anticipated expiration: 2032-03-02

Abstract

The utility model relates to a multilayer filter auto-change over device for heavy-calibre photoelectric telescope, including the main body frame who roughly is rectangular shape and middle fretwork, the part of fretwork is equipped with the optical filter subassembly in the middle of the main body frame, two parallel long edges of each other of main body frame all are equipped with actuating mechanism and guide rail, the optical filter subassembly includes a plurality of optical filters of stacking, every optical filter all with actuating mechanism the guide rail links to each other. The utility model provides a multilayer filter auto-change over device for heavy-calibre photoelectric telescope, compact structure, the volume is less, and the shading is than little, can improve observation efficiency. And, the utility model discloses positioning accuracy is high, and switching speed is fast, and switches process automation degree height.

Description

Multilayer optical filter switching device for large-aperture photoelectric telescope

Technical Field

The utility model relates to an ray apparatus manufacturing and designing technical field, more specifically relates to a multilayer filter auto-change over device for heavy-calibre photoelectric telescope.

Background

In order to realize large-view-field space target search and large-target-surface multicolor photometric observation in the field of astronomy, a plurality of optical filters need to be configured in a main focus system of a large-aperture photoelectric telescope, and automatic switching can be realized among different optical filters. At present, automatic switching among different optical filters is realized by adopting a rotary optical filter switching mechanism generally, but for a main focus telescope, the rotary optical filter switching mechanism has a large volume, and the problem of overlarge shading ratio caused by shielding of a large number of optical paths is solved, so that the observation efficiency of a large-aperture photoelectric telescope is reduced. Therefore, a switching mechanism capable of integrating a plurality of filters in a small volume and realizing fast and accurate automatic switching is needed.

SUMMERY OF THE UTILITY MODEL

For solving the problem among the above-mentioned prior art, the utility model provides a multilayer filter auto-change over device for heavy-calibre photoelectric telescope, its volume is less, can improve observation efficiency when accurately automatically switched over light filter fast.

The utility model provides a pair of multilayer filter auto-change over device for heavy-calibre photoelectric telescope, including the main body frame who roughly is rectangular shape and middle fretwork, the part of fretwork is equipped with the optical filter subassembly in the middle of the main body frame, two parallel long edges of each other of main body frame all are equipped with actuating mechanism and guide rail, the optical filter subassembly includes a plurality of optical filters of stacking, every optical filter all with actuating mechanism the guide rail links to each other.

Further, the optical filter assembly includes an upper filter, an intermediate filter, and a lower filter.

Furthermore, each optical filter is installed in a mirror frame, a connecting plate is arranged on the mirror frame, and the connecting plate is connected with the sliding block on the guide rail.

Further, actuating mechanism includes ball and with the motor that ball links to each other, the nut on the ball pass through the bulb screw with the picture frame links to each other.

Further, the motor adopts a high-speed direct current motor and is provided with a planetary reduction mechanism.

Furthermore, limit switches for limiting the movement stroke of the optical filter are mounted at two ends of the main body frame.

Further, the diameter of the optical filter is 135 mm.

Further, the rotating speed of the motor is more than 450r/min, and the outer diameter is at most 22 mm.

Furthermore, the movement stroke of the optical filter is 150mm, and the repeated positioning precision of the limit switch is less than or equal to +/-0.1 mm.

Further, the thickness of the multilayer filter switching device is less than 45 mm.

The utility model provides a multilayer filter auto-change over device for heavy-calibre photoelectric telescope, compact structure, the volume is less, and the shading is than little, can improve observation efficiency. And, the utility model discloses positioning accuracy is high, and switching speed is fast, and switches process automation degree height.

Drawings

Fig. 1 is a schematic structural diagram of a multilayer filter switching device for a large-aperture photoelectric telescope according to the present invention.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a multilayer filter auto-change over device for heavy-calibre photoelectric telescope, including the main body frame 1 that roughly is rectangular shape and middle fretwork, the part of fretwork is equipped with optical filter subassembly 2 in the middle of main body frame 1, and two parallel long edges of each other of main body frame 1 all are equipped with actuating mechanism 3 and guide rail 4, and optical filter subassembly 2 includes a plurality of optical filters that stack, and every optical filter all links to each other with actuating mechanism 3, guide rail 4.

Specifically, the filter assembly 2 includes an upper filter 21, an intermediate filter 22, and a lower filter 23. Each optical filter is arranged in an independent mirror frame 24, a connecting plate 25 is arranged on the mirror frame 24, and the connecting plate 25 is connected with the sliding block on the guide rail 4 so as to fix the optical filters and ensure the stability of each optical filter when the telescope moves. In the present embodiment, the number of the filter assemblies 2 is two, that is, there are 6 filters, and the wavelength bands of the 6 filters are different, and the diameter of each filter is 135 mm. In other embodiments, two, four, or other numbers of optical filters, or three or more optical filter assemblies may be provided as desired.

Actuating mechanism 3 includes ball 31 and the motor 32 that links to each other with ball 31 through the shaft coupling, and the last nut 33 of ball 31 passes through ball head screw 34 and links to each other with picture frame 24 to guarantee the flexibility when the light filter switches. The number of drive mechanisms 3 is equal to the number of filters, i.e. there is a separate drive mechanism 3 for each filter.

The utility model discloses locate optical filter assembly 2 and guide rail 4's both sides with actuating mechanism 3, reducible whole auto-change over device's thickness for whole auto-change over device's thickness is less than 50mm, in order to reduce its influence to optical imaging. In this embodiment, the thickness of the entire switching device is 45 mm.

The utility model discloses a auto-change over device during operation, the driver send instruction for motor 32 through computer control program rotates with control motor 32, and motor 32 passes through the shaft coupling and drives ball 31 and rotate to turn into linear motion through nut 33, and then drive the light filter and remove at main body frame 1's long limit direction. When the optical filter moves from one end of the device to the center of the device, the optical filter moves into the optical path; when the optical filter moves from the center of the device to one end of the device, the optical filter moves out of the optical path. When one optical filter is required to work, all the other optical filters are moved out of the optical path; when another optical filter is needed to work, the optical filter is moved into the optical path, and the former optical filter is moved out of the optical path at the same time, so that the observation requirements of various optical filters are met.

The utility model discloses a translation formula multilayer switches structure, only direction increase device size about central visual field, therefore the device volume is less, only exists in the direction about central visual field promptly and is in the light, and the shading ratio is smaller. Meanwhile, in order to ensure the precise positioning of the optical filter, limit switches 5 are installed at both ends of the main body frame 1 (i.e., the extreme positions of the movement of the optical filter) to limit the movement stroke of the optical filter. In this embodiment, the movement stroke of the optical filter is 150mm, and the repeated positioning accuracy of the limit switch 5 is less than or equal to ± 0.1 mm.

In order to meet the requirement of fast switching of the optical filter, the motor 32 is a high-speed direct current motor and is provided with a planetary reduction mechanism. The filter can output larger torque to drive the filter to move while meeting the requirement of quick movement. In order to ensure that the whole switching time is less than 5 seconds, the rotating speed of the motor is required to be more than 450 r/min. Meanwhile, due to the size limitation of the whole switching device, the outer diameter of the motor is not more than 22 mm. In the present embodiment, the rotational speed of the motor 32 is 500 r/min.

During rotation of the telescope, the optical filter assembly is deformed differently by the influence of gravity. Specifically, when the telescope is pointed horizontally, the maximum deformation of gravity along the direction perpendicular to the optical axis is 0.5 μm, and the maximum deformation along the optical axis is 0.1 μm; when the telescope points to the zenith, the maximum deformation of gravity along the direction vertical to the optical axis is 0.5 μm, and the maximum deformation along the optical axis is 1.7 μm. Therefore, the deformation of the optical filter assembly caused by gravity is small, and the structural stability is not influenced.

The utility model provides a translation formula multilayer automatic switching control equipment, compact structure, it is small, the shading is than little, and positioning accuracy is high, and switching speed is fast, and switches process automation degree height.

What has been described above is only the preferred embodiment of the present invention, not for limiting the scope of the present invention, but various changes can be made to the above-mentioned embodiment of the present invention. All the simple and equivalent changes and modifications made according to the claims and the content of the specification of the present invention fall within the scope of the claims of the present invention. The present invention is not described in detail in the conventional technical content.

Claims

1. The utility model provides a multilayer filter auto-change over device for heavy-calibre photoelectric telescope, its characterized in that, is including roughly being rectangular shape and middle fretwork's main body frame, the part of fretwork is equipped with the filter subassembly in the middle of the main body frame, two long edges that are parallel to each other of main body frame all are equipped with actuating mechanism and guide rail, the filter subassembly includes a plurality of optical filters of stacking, every optical filter all with actuating mechanism the guide rail links to each other.

2. The multi-layer optical filter switching device for a large-aperture photoelectric telescope of claim 1, wherein the optical filter assembly comprises an upper layer optical filter, an intermediate optical filter and a lower layer optical filter.

3. The multi-layer optical filter switching device for a large-aperture photoelectric telescope of claim 1, wherein each optical filter is installed in a frame, and the frame is provided with a connecting plate, and the connecting plate is connected to the sliding block on the guide rail.

4. The multi-layer optical filter switching device for a large-aperture photoelectric telescope of claim 3, wherein the driving mechanism comprises a ball screw and a motor connected with the ball screw, and a nut on the ball screw is connected with the lens frame through a ball screw.

5. The multilayer filter switching device for a large-aperture photoelectric telescope of claim 4, wherein the motor is a high-speed DC motor and is provided with a planetary reduction mechanism.

6. The multi-layer filter switching device for a large-aperture photoelectric telescope of claim 1, wherein limit switches for limiting the movement stroke of the filter are installed at both ends of the main body frame.

7. The multilayer filter switching device for a large-aperture photoelectric telescope of claim 1, wherein the diameter of the filter is 135 mm.

8. The multilayer filter switching device for a large-aperture photoelectric telescope of claim 4, wherein the motor has a rotation speed of more than 450r/min and an outer diameter of at most 22 mm.

9. The multilayer filter switching device for a large-aperture photoelectric telescope of claim 6, wherein the movement stroke of the filter is 150mm, and the repeated positioning accuracy of the limit switch is less than or equal to ± 0.1 mm.

10. The multilayer filter switching device for a large-aperture electro-optical telescope of claim 1, wherein the thickness of the multilayer filter switching device is less than 45 mm.