CN-224232038-U - Off-axis star guider, astronomical telescope star guiding assembly and astronomical telescope

CN224232038UCN 224232038 UCN224232038 UCN 224232038UCN-224232038-U

Abstract

The utility model discloses an off-axis star guider, an astronomical telescope star guiding assembly and an astronomical telescope. The off-axis star guider comprises a connecting main body, a focusing device and an optical path coupler, wherein the focusing device is fixedly connected with the connecting main body, the optical path coupler is in movable fit with the connecting main body, the optical path coupler is provided with a first connecting structure, and the first connecting structure is used for being detachably connected with the star guiding camera. The focusing device is used as a part of the off-axis star guide, can be used for focusing the star guide camera, can be used for accurately adjusting the position of the prism or the reflecting mirror, can be operated without detaching the off-axis star guide from other equipment such as a telescope or the like when the position of the prism or the reflecting mirror is adjusted by using the focusing device, is convenient to use, and can accurately know the position of the prism or the reflecting mirror.

Inventors

CHEN ZHIWEI

Assignees

苏州墨空视觉技术有限公司

Dates

Publication Date: 20260512
Application Date: 20250529

Claims (16)

1. An off-axis star guider for extracting part of light from the edge region of a main imaging light path and guiding the light to a star guiding camera is characterized by comprising a connecting main body, a focusing device and a light path coupler, wherein the focusing device is fixedly connected with the connecting main body, the light path coupler is movably matched with the connecting main body and the focusing device, The focusing device and the optical path coupler are jointly configured to form a star-guiding optical path, the connecting main body is used for being connected with a telescope and/or a main camera and is connected with a main imaging optical path between the telescope and the main camera, the optical path coupler is used for guiding part of light rays in the main imaging optical path into the star-guiding optical path, the optical path coupler is provided with a first connecting structure, the first connecting structure is used for being detachably connected with the star-guiding camera, and when the optical path coupler is connected with the star-guiding camera, the optical path coupler and the star-guiding camera can be synchronously driven by the focusing device to move along the axial direction of the focusing device, so that the radial position of the optical path coupler in the main imaging optical path is changed.
2. The off-axis star guider according to claim 1, wherein the connecting body is provided with a first pore canal which is penetrated along the axial direction of the connecting body, when the connecting body is connected with the telescope and/or the main camera, the first pore canal is positioned on a main imaging optical path of the telescope and the main camera, a second pore canal which is penetrated along the axial direction of the connecting body is arranged inside the focusing device, the focusing device is used for being connected with the star guiding camera and focusing the star guiding camera, the optical path coupler is provided with a third pore canal which is penetrated along the axial direction of the connecting body, one end of the optical path coupler is arranged in the second pore canal, the other end of the optical path coupler is arranged in the first pore canal and the second pore canal, and the optical path coupler, the third pore canal and the second pore canal jointly form the star guiding optical path.
3. The off-axis star guide of claim 2, wherein the optical coupler comprises a mounting bracket and an optical path splitting element, a first end of the mounting bracket is disposed in the first channel, a second end of the mounting bracket is disposed in the second channel, a third channel is disposed in the mounting bracket, the optical path splitting element is disposed at a first end of the mounting bracket, and the first connection structure is disposed at the second end.
4. The off-axis star guide of claim 3 wherein the optical path splitting element comprises a splitting prism or mirror.
5. A satellite guide device for a shaft deviation according to claim 3, wherein the connecting body is of an annular structure, the connecting body is surrounded to form the first pore canal, the focusing device is arranged on the outer side of the connecting body along the radial direction of the connecting body, the axial direction of the focusing device is parallel to the radial direction of the connecting body, a fourth pore canal which extends along the radial direction of the connecting body is further arranged on the connecting body, the fourth pore canal is communicated with the first pore canal and the second pore canal, a part of the mounting frame close to the first end part extends into the first pore canal from the fourth pore canal, the radial dimension of the second end part is larger than the radial dimension of other parts, and the second end part is used as a limiting structure for limiting the radial movement distance of the light path coupler along the connecting body.
6. The off-axis star guide of claim 5, wherein the connecting body is further provided with a first locking screw, the first locking screw is in threaded connection with the connecting body, and the first locking screw is used for locking or unlocking the optical path coupler.
7. The off-axis star guide of claim 1, wherein the first connection structure is a threaded structure or a mortise and tenon structure.
8. The off-axis star guider as claimed in claim 1, wherein a dial for indicating a focusing stroke is arranged on the focusing device, and stroke graduation marks for indicating the focusing stroke are arranged on the dial.
9. The off-axis star guide of claim 8 wherein the focus mount is a double spiral focus mount.
10. An astronomical telescope star guiding assembly, characterized by comprising a star guiding camera and the off-axis star guiding device according to any one of claims 1-9, wherein a part of the star guiding camera is sleeved in the focusing device and is detachably connected with the focusing device, and a second connecting structure is arranged on the star guiding camera and is detachably connected with a first connecting structure positioned on the optical path coupler; When the first connecting structure and the second connecting structure are in a separated state and the star-guiding camera is connected with the focusing device, the star-guiding camera can be independently driven by the focusing device to move along the axial direction of the focusing device; when the first connecting structure and the second connecting structure are in a connecting state, and the star guiding camera is connected with the focusing device, the star guiding camera and the light path coupler can be driven by the focusing device to move along the axial direction of the focusing device at the same time.
11. The astronomical telescope guide assembly according to claim 10, further comprising a second locking screw provided on an outer barrel of the focusing device and at least used for locking or unlocking the guide star camera, the outer barrel being capable of generating a telescopic movement in its own axial direction.
12. The astronomical telescope guide assembly according to claim 11, wherein when the guide camera is not connected to the outer barrel, the guide camera is capable of producing relative linear movement with the focus regulator in an axial direction of the focus regulator and/or relative rotational movement about an axis of the focus regulator.
13. The astronomical telescope guide assembly according to claim 12, wherein the first connecting structure and the second connecting structure are connected by mortise and tenon connection or threaded connection.
14. The astronomical telescope guide assembly according to claim 13, wherein the second connecting structure is a mortise and tenon structure or a screw structure.
15. The astronomical telescope guide assembly according to claim 12, wherein the second connection structure is located at an end of the guide camera near the optical path coupler.
16. An astronomical telescope characterized in that it has an off-axis star guide as claimed in any one of claims 1 to 9 or an astronomical telescope star guide assembly as claimed in any one of claims 10 to 15.

Description

Off-axis star guider, astronomical telescope star guiding assembly and astronomical telescope Technical Field The utility model particularly relates to an off-axis star guider, an astronomical telescope star guiding assembly and an astronomical telescope, and belongs to the technical field of astronomical observation and photography. Background In astronomical observations and deep space photography, it is often necessary to correct telescope pointing in real time using a satellite guiding system (Guiding System) in order to compensate for satellite point drift due to earth rotation, telescope tracking errors or mechanical deformations. One technique currently in common use is off-axis star guides (OAGs). The off-axis star guider extracts part of light rays from the edge of the view field for guiding the star under the condition of not influencing the main imaging light path, thereby realizing high-precision telescope tracking correction. Compared with the traditional independent star guide or coaxial star guide, the OAG has the advantages of compact structure, shared optical path, reduced mechanical deformation error and the like, and is widely applied to the fields of deep space photography, planetary observation and the like. The core principle of the off-axis star guide is to use a beam splitter prism or mirror to extract a small portion of the light from the edge region of the main imaging path and direct it to the star-guide camera. Because the star guiding light path and the main imaging light path share the same optical system, the star guiding error caused by mechanical deformation of the traditional star guiding mirror can be avoided. The typical structure of the off-axis star guider is composed of a main light path interface for connecting the telescope with a main camera (such as a single-lens or astronomical CCD). The beam splitter prism/reflector is positioned at the edge of the light path and does not affect the main imaging area. Star camera interface-typically an M42 screw or 1.25 inch standard interface, to fit the mainstream star camera. And the focusing mechanism is provided with a spiral focusing seat at part of the high-end OAG, so that accurate focusing is facilitated. The off-axis star director uses a prism or mirror to extract a small portion of the light from the edge of the main light path into the star director for star directing. If the prism or the reflector is too close to the center of the light path, the main camera is blocked, and if the prism or the reflector is too close to the edge, the star guiding effect is affected due to poor imaging quality and low signal to noise ratio of the edge light. Therefore, the position of the prism or the reflecting mirror needs to be accurately adjusted as close to the center of the optical path as possible, but shielding of the main camera is avoided. At present, a common off-axis star guider, a prism or a reflecting mirror is arranged on a columnar structure (prism column), and the prism column is fixed on a main body structure of the off-axis star guider through screws. When the position of the prism needs to be adjusted, the fixing screw is loosened, and then the position of the prism column relative to the center of the optical path is manually moved, so that the position of the prism or the reflecting mirror is adjusted. The method has two defects that the position of the prism or the reflecting mirror cannot be accurately adjusted due to manual movement of the prism column, and in order to facilitate operation when the prism column is moved, the off-axis star guider is usually required to be detached from other equipment such as a telescope to readjust the position of the prism or the reflecting mirror, so that the operation method is complicated. Some off-axis star guides have a double spiral focus adjuster to adjust the position of the star guide camera and thereby focus the star guide camera, but the double spiral focus adjuster cannot be used to adjust the position of the prism or mirror. Disclosure of utility model The utility model mainly aims to provide an off-axis star guider, an astronomical telescope star guiding assembly and an astronomical telescope, so that the defects in the prior art are overcome. In order to achieve the purpose of the utility model, the technical scheme adopted by the utility model comprises the following steps: a first aspect of the embodiments of the present utility model provides an off-axis star guider for extracting a portion of light from an edge region of a main imaging light path and guiding the extracted light to a star camera, which includes a connection body, a focus controller fixedly connected to the connection body, and a light path coupler movably engaged with the connection body and the focus controller, The focusing device and the optical path coupler are jointly configured to form a star-guiding optical path, the connecting main body is used for being connected with a telescope and