Turnover type filter switching device

Abstract

The invention relates to a filter switching device in an astronomical telescope imaging system, in particular to a turnover filter switching device. The device comprises a mounting structure, a plurality of driving motors and a plurality of filter mounting frames. The installation structure is used for being connected with an optical system and used for supporting and installing all parts, and the installation structure is provided with a light path through hole for light rays to pass through. The plurality of driving motors are arranged around the light path through hole, and each driving motor is connected with the corresponding filter mounting frame and is used for driving the filter mounting frame to turn over, so that whether the filters enter the light path or not is controlled, and switching among different filters is realized. Compared with an existing filter switching device adopting a rotating disc type filter wheel structure, when the filter switching device is applied to a primary focus telescope, the projection area of the device in the light path direction can be remarkably reduced, so that shielding of an incident light path of the telescope is reduced, and the imaging quality of an optical system is improved.

Description

Technical Field

[0001] This invention relates to a filter switching device in an astronomical telescope imaging system, and more specifically to a flip-type filter switching device. Background Technology

[0002] In astrophotography and astronomical observation, different types of filters are typically used depending on the observation target or imaging requirements, such as narrowband filters, broadband filters, or light pollution suppression filters. Therefore, a filter switching device is needed in the telescope's optical path to switch between various filters. A common existing filter switching device is a filter wheel structure, which usually includes a disc-shaped filter mounting plate with multiple filter mounting positions evenly arranged along its circumference. A motor drives the filter plate to rotate, causing different filters to sequentially rotate to their optical path positions, thus achieving filter switching. However, because the filter wheel needs to arrange multiple filter mounting positions on the disc, it has a large diameter. When this type of device is used in a prime focus telescope imaging system, the filter wheel usually needs to be installed directly in front of the telescope. In this case, the large projected area of ​​the filter wheel will obstruct the incident light path of the telescope, thereby reducing the telescope's effective aperture and affecting image quality. Therefore, there is a need for a more compact filter switching device with a smaller projected area along the optical path. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flip-type filter switching device. This invention is achieved through the following technical solution.

[0004] This invention includes a mounting structure, multiple drive motors, and multiple filter mounting frames. The mounting structure is used to connect to an optical system and to support and mount components such as the drive motors. The mounting structure can be a housing, frame, or other structural form capable of mounting and connecting components. The mounting structure is provided with an optical path through-hole to allow light from a telescope to pass along the optical path and enter the camera. Multiple drive motors are mounted around the optical path through-hole, each drive motor connected to a filter mounting frame, forming an independent flipping structure. The drive motors can be connected to the filter mounting frames via a transmission mechanism or by directly connecting the output shaft of the drive motor to the filter mounting frames to drive their flipping motion. During operation, by controlling the multiple drive motors, the filter mounting frame corresponding to the desired filter is flipped to the optical path position, allowing the filter to enter the optical path. Simultaneously, the remaining filter mounting frames are flipped to positions away from the optical path, thereby enabling the switching between different filters.

[0005] The beneficial effects achieved by this invention are: when the filter switching device needs to be installed in front of the telescope, compared with the existing filter switching device that uses a rotating filter wheel structure, the orthographic projection size of the device in the optical path direction is greatly reduced, the obstruction of the light entering the main focal telescope is reduced, and the imaging quality of the optical system is improved. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the overall structure of the present invention, wherein the mounting structure is shown separately to facilitate the display of the internal structure.

[0007] Figure 2 This is a partial structural diagram of the present invention, showing the state when all filter mounting frames are in the position away from the optical path.

[0008] Figure 3 This is a partial structural diagram of the present invention, showing the state of one of the filter mounting frames when it is flipped to the optical path position.

[0009] Figure 4 This is a schematic diagram of the flipping structure of a single drive motor and filter mounting frame in this invention.

[0010] In the figure: 1. Mounting structure A, 2. Mounting structure B, 3. Drive motor, 4. Filter mounting frame, 101. Optical path through hole on mounting structure A, 201. Optical path through hole on mounting structure B. Detailed Implementation

[0011] like Figure 1 As shown, the present invention includes mounting structure A (1), mounting structure B (2), multiple drive motors (3), and multiple filter mounting frames (4). Mounting structure A (1) and mounting structure B (2) are arranged opposite to each other, forming a support structure for mounting the various structural components and connecting the device to the telescope and camera side. Mounting structure A (1) has an optical path through-hole (101), and mounting structure B (2) also has an optical path through-hole (201), forming an optical path channel through the device to allow light from the telescope to pass through and enter the camera. Figure 1 In the diagram, mounting structure A(1) and mounting structure B(2) are shown separately to facilitate the demonstration of their internal structures. For example... Figure 2 As shown, multiple drive motors (3) are arranged around the optical path through-hole (101), and each drive motor (3) is connected to a corresponding filter mounting frame (4), which is used to mount the filter. Figure 4 As shown, in this embodiment, the filter mounting frame (4) is directly connected to the output shaft of the corresponding drive motor (3). When the drive motor (3) rotates, it can drive the filter mounting frame (4) to rotate around its axis. Figure 4The arrows in the diagram indicate the movement mode and direction of the filter mounting frames. In other embodiments, the drive motor (3) can also be connected to the filter mounting frames (4) via a transmission mechanism, such as a gear mechanism, linkage mechanism, or other transmission structure, to achieve power transmission between the drive motor (3) and the filter mounting frames (4) to drive the filter mounting frames (4) to rotate. When all filter mounting frames (4) are in the flipped-up position, each filter leaves the optical path channel, and light can pass directly without passing through the filters. Figure 3 As shown, when a certain filter is needed, the corresponding drive motor (3) drives the filter mounting frame (4) connected to it to flip onto the optical path through hole (101), so that the filter enters the optical path and realizes the switching between different filters. Figure 3 The arrows in the image indicate the movement and direction of the filter mounting frame.

Claims

1. A flip-type filter switching device, characterized in that, It includes an installation structure, multiple drive motors (3) and multiple filter mounting frames (4); the multiple drive motors (3) drive the multiple filter mounting frames (4) to rotate, thereby controlling whether the filter enters the optical path and realizing the switching of different filters.

2. The flip-type filter switching device according to claim 1, characterized in that, The mounting structure is provided with an optical path through hole for light to pass through.

3. The flip-type filter switching device according to claim 1, characterized in that, The mounting structure is used to connect the device to the optical system and to support and mount the various components.

4. The flip-type filter switching device according to claim 2, characterized in that, The plurality of drive motors (3) are arranged in the area surrounding the optical path through hole.

5. The flip-type filter switching device according to claim 1, characterized in that, The drive motor (3) is connected to the filter mounting frame (4) through a transmission mechanism, or the filter mounting frame (4) is directly connected to the output shaft of the drive motor (3).

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