Telescope

Abstract

The utility model discloses a telescope which comprises a primary mirror assembly, a secondary mirror assembly and a middle ferrule, and the primary mirror assembly and the middle ferrule are fixedly installed through a connecting rod. The telescope further comprises an overturning rod, the first end of the overturning rod is fixedly installed on the secondary mirror assembly, and the second end of the overturning rod is rotatably installed on the outer side of the middle ferrule. In the first state, the primary mirror assembly and the secondary mirror assembly are arranged on the two sides of the middle ferrule respectively, in the second state, the primary mirror assembly and the secondary mirror assembly are both arranged on the same side of the middle ferrule, and in the first state and the second state, the overturning rods are both parallel to the axis of the middle ferrule. According to the telescope provided by the utility model, the position of the secondary mirror assembly on the middle ferrule can be changed through the rotation of the overturning rod, the relative position between the secondary mirror assembly and the primary mirror assembly can be changed according to the use condition, and the secondary mirror assembly can be positioned through the limiting opening in the middle ferrule during use; when the telescope is used, the optical axis does not deviate, and extra calibration is not needed.

Description

Technical Field

[0001] This utility model belongs to the field of optical equipment technology, and specifically relates to a telescope. Background Technology

[0002] Among the many types of telescopes, the Newtonian telescope is widely used as a reflecting telescope. The main feature of this type of telescope is that it uses a parabolic mirror as the primary mirror and a flat diagonal reflecting mirror. Its working principle is to use the parabolic mirror to reflect and focus light to a point, and place a reflecting mirror at a 45° angle to the primary mirror in front of the focal point of the primary mirror. The converging light reflected by the primary mirror is reflected by the reflecting mirror at a 90° angle out of the telescope tube and then reaches the eyepiece for observation.

[0003] In existing technologies, reflecting telescopes are generally quite large due to their long focal lengths. Therefore, the following solutions are often used when designing telescopes: 1) Design the telescope's tooth dimensions according to the actual focal length, ensuring the size is the same during use and when stored. However, this design results in a very large telescope, especially large-aperture telescopes, which are extremely inconvenient to use and carry. 2) Telescopes that are retractable, dividing the telescope into upper and lower parts. One part is pulled out from the other for use and retracted for storage. However, this design is prone to optical axis misalignment during extension and retraction, requiring recalibration. 3) Modular telescopes, designed as several modules including a secondary mirror assembly, a primary mirror assembly, and a connecting rod assembly. The telescope needs to be reassembled for use and disassembled for storage when not in use. However, assembling and adjusting these telescopes is cumbersome and requires some operational experience.

[0004] Therefore, it is necessary to provide a telescope to address the aforementioned technical problems.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a telescope that can solve the technical problems of large size and cumbersome use of existing telescopes.

[0007] To achieve the above objectives, a specific embodiment of this utility model provides a telescope, which includes a primary mirror assembly, a secondary mirror assembly, and a middle ring. The primary mirror assembly and the middle ring are fixedly installed together by a connecting rod. The telescope also includes a flip rod, the first end of which is fixedly installed with the secondary mirror assembly, and the second end of which is rotatably installed on the outside of the middle ring. In a first state, the primary mirror assembly and the secondary mirror assembly are respectively located on both sides of the middle ring. In a second state, the primary mirror assembly and the secondary mirror assembly are both located on the same side of the middle ring. In both the first and second states, the flip rod is parallel to the axis of the middle ring.

[0008] In one or more embodiments of this utility model, the outer side of the middle collar is provided with an inwardly recessed limiting opening, and in the first state, the side of the flipping rod abuts against the limiting opening.

[0009] In one or more embodiments of this utility model, a first mounting block is installed on the side of the middle collar near the main lens assembly, and the second end of the flip rod is rotatably mounted on the first mounting block via a first handwheel; and / or,

[0010] A reinforcing rod is detachably installed between the middle collar and the secondary lens assembly. A second mounting block is installed on the opposite side of the secondary lens assembly and the middle collar. In the first state, the two ends of the reinforcing rod are respectively fixedly installed on the second mounting blocks of the secondary lens assembly and the middle collar.

[0011] In one or more embodiments of this utility model, a ball head seat is installed on the opposite side of the main lens assembly and the middle collar, the connecting rod is installed between the ball head seats of the main lens assembly and the middle collar, and a light shield is installed on the main lens assembly and the middle collar, the light shield being installed inside the connecting rod.

[0012] In one or more embodiments of this utility model, the primary lens assembly includes an objective lens ring, an objective lens mounting plate, an objective lens fixing plate, an objective lens, and a cover plate. The ball head is mounted on one side of the objective lens ring, the objective lens mounting plate is mounted at the center of the objective lens ring, the objective lens is mounted at the center of the objective lens mounting plate, the objective lens fixing plate is also mounted between the objective lens and the objective lens mounting plate, and a cover plate is mounted on the objective lens.

[0013] In one or more embodiments of this utility model, the secondary mirror assembly includes a front collar, a rear collar, a support rod, a pull plate, a reflector mount, a reflector, a focusing mechanism mounting plate, and a focusing mechanism. The second mounting block is installed on the side of the front collar near the middle collar. The support rod is installed between the front collar and the rear collar. A reflector mount is installed at the center of the rear collar via the pull plate. A reflector is installed on the side of the reflector mount near the front collar. A focusing mechanism mounting plate is also installed between the front collar and the rear collar. A focusing mechanism is installed on the side of the focusing mechanism mounting plate away from the reflector.

[0014] In one or more embodiments of the present invention, the focusing mechanism includes a focusing base, a focusing unit, and an eyepiece unit. The focusing base is fixedly mounted on the focusing mechanism mounting plate. The eyepiece unit is mounted inside the focusing base and on the outside of the focusing base. The focusing unit is also connected to the eyepiece unit disposed inside the focusing base to adjust the position of the eyepiece unit relative to the focusing base.

[0015] In one or more embodiments of this utility model, the focusing unit includes a second handwheel, a handwheel seat, and a rotating shaft. The handwheel seat is installed on the outside of the focusing seat, the rotating shaft is installed inside the handwheel seat, the rotating shaft is connected to the eyepiece unit for transmission, and the second handwheel is installed at both ends of the rotating shaft.

[0016] In one or more embodiments of this utility model, the eyepiece unit includes a focusing tube, an eyepiece mount, a first lens, a second lens, a third lens, an extension joint, an eyepiece tube, an eyepiece extension tube, and a toothed plate. The toothed plate is fixedly installed on the outside of the focusing tube, and the focusing tube is slidably installed inside the focusing mount. The outside of the toothed plate meshes with the rotating shaft. An eyepiece mount is installed inside the focusing tube. A second lens and a third lens are sequentially installed inside the eyepiece mount from the image side to the object side. An extension joint is installed at the end of the eyepiece mount near the second lens. An eyepiece extension tube is installed inside the extension joint. A first lens is installed inside the eyepiece extension tube. An eyepiece tube is installed at the end of the eyepiece extension tube.

[0017] In one or more embodiments of this utility model, the object-side optical axis of the first lens is convex, and the image-side optical axis is convex; the object-side optical axis of the second lens is convex, and the image-side optical axis is concave; the object-side optical axis of the third lens is convex, and the image-side optical axis is concave.

[0018] Compared with the prior art, the telescope in this invention can change the position of the secondary mirror assembly on the middle ring by rotating the flip rod, thereby changing the relative position between the secondary mirror assembly and the primary mirror assembly. While ensuring that the telescope can be used normally, it also reduces the size of the telescope when stored. The secondary mirror assembly is positioned by the limiting port on the middle ring to ensure that the optical axis of the telescope will not be deviated during use. The entire telescope does not require additional time for calibration during use, and its small size and space-saving design make it easy to carry when stored. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the telescope in use according to one embodiment of the present invention;

[0021] Figure 2 This is a structural schematic diagram of the telescope storage process in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the telescope being stored in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the collar in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the secondary mirror assembly in one embodiment of the present invention;

[0025] Figure 6 This is a top view of the focusing mechanism in one embodiment of the present invention;

[0026] Figure 7 This is a cross-sectional view of the focusing mechanism in one embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the main mirror assembly in one embodiment of the present invention.

[0028] Explanation of key figure labels:

[0029] 1. Primary lens assembly; 11. Objective lens collar; 12. Objective lens mounting plate; 13. Objective lens fixing plate; 14. Objective lens; 15. Cover plate; 2. Secondary lens assembly; 21. Front collar; 22. Rear collar; 23. Support rod; 24. Pull plate; 25. Mirror mount; 26. Mirror; 27. Focusing mechanism mounting plate; 28. Focusing mechanism; 281. Focusing mount; 282. Focusing unit; 2821. Second handwheel; 2822. Handwheel seat; 2823. Rotating shaft; 283. Eyepiece unit 2831. Focusing tube; 2832. Eyepiece mount; 2833. First lens; 2834. Second lens; 2835. Third lens; 2836. Extension joint; 2837. Eyepiece tube; 2838. Eyepiece extension tube; 2839. Toothed plate; 3. Middle collar; 31. Limiting port; 4. Flipping rod; 5. Reinforcing rod; 6. Connecting screw; 7. First handwheel; 8. Connecting rod; 9. First mounting block; 10. Second mounting block; 101. Ball head seat; 102. Light shield. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0031] like Figures 1-3 As shown, in one embodiment of this utility model, the telescope is a Newtonian telescope, which includes a primary mirror assembly 1, a secondary mirror assembly 2, and a middle ring 3. The primary mirror assembly 1 and the middle ring 3 are fixedly installed together by a connecting rod 8. The telescope also includes a flip rod 4, the first end of which is fixedly installed with the secondary mirror assembly 2, and the second end is rotatably installed on the outside of the middle ring 3.

[0032] In the first state, the primary mirror assembly 1 and the secondary mirror assembly 2 are respectively located on both sides of the middle ring 3. In the second state, the primary mirror assembly 1 and the secondary mirror assembly 2 are both located on the same side of the middle ring 3. The primary mirror assembly 1 reflects and focuses the light to a point. The focal point of the primary mirror assembly 1 enters the secondary mirror assembly 2, and then the secondary mirror assembly 2 is used for focusing and observation. In both the first and second states, the flip rod 4 is parallel to the axis of the middle ring 3.

[0033] The first state is the state when the telescope is in use, and the second state is the state when the telescope is stored. In the first state, when using the telescope, light enters from the side of the secondary mirror assembly 2 away from the middle ring 3 and passes through the middle ring 3. After passing through the middle ring 3, the light shines on the primary mirror assembly 1 and is reflected back to the secondary mirror assembly 2. The secondary mirror assembly 2 is equipped with an eyepiece for observation. After use, the secondary mirror assembly 2 is flipped to be close to the primary mirror assembly 1 by flipping the flip lever 4. In the second state, the size of the entire telescope is greatly reduced, making it easier to store and carry the telescope.

[0034] like Figure 4 As shown, in this embodiment, the outer side of the middle collar 3 is provided with an inwardly recessed limiting opening 31. In the first state, the side of the flip rod 4 abuts against the limiting opening 31. The limiting opening 31 on the middle collar 3 ensures that when using the telescope, rotating the flip rod 4 allows the secondary mirror assembly 2 to be directly rotated to a position corresponding to the optical axis of the primary mirror assembly 1. The limiting opening 31 and the flip rod 4 cooperate to allow the entire telescope to be used directly after the secondary mirror assembly 2 is flipped, without the need for additional calibration.

[0035] like Figure 1 , 4 As shown, in this embodiment, a first mounting block 9 is installed on the side of the middle collar 3 near the primary mirror assembly 1. The second end of the flip rod 4 is rotatably mounted on the first mounting block 9 via a first handwheel 7. A reinforcing rod 5 is detachably installed between the middle collar 3 and the secondary mirror assembly 2. Second mounting blocks 10 are installed on opposite sides of the secondary mirror assembly 2 and the middle collar 3. In the first state, both ends of the reinforcing rod 5 are fixedly mounted on the second mounting blocks 10 of the secondary mirror assembly 2 and the middle collar 3 respectively via locking screws 6, ensuring the stability between the primary mirror assembly 1 and the secondary mirror assembly 2. The flip rod 4 is mounted on the side of the middle collar 3 via the first mounting block 9, and the position of the flip rod 4 is locked by the first handwheel 7. The flip rod 4 is locked using the first handwheel 7 in both the first and second states, ensuring the structural stability of the telescope during use and storage.

[0036] In this embodiment, ball joints 101 are installed on opposite sides of the main lens assembly 1 and the middle collar 3. The connecting rod 8 is installed between the ball joints 101 of the main lens assembly 1 and the middle collar 3. A light shield 102 is installed on the main lens assembly 1 and the middle collar 3. The light shield 102 is installed inside the connecting rod 8. The light shield 102 is used to ensure that the main lens assembly 1 is not interfered with by the surrounding stray light.

[0037] like Figure 8As shown, the primary lens assembly 1 in this embodiment includes an objective lens collar 11, an objective lens mounting plate 12, an objective lens fixing plate 13, an objective lens 14, and a cover plate 15. A ball head 101 is mounted on one side of the objective lens collar 11. The objective lens mounting plate 12 is mounted at the center of the objective lens collar 11. The objective lens 14 is mounted at the center of the objective lens mounting plate 12. The objective lens fixing plate 13 is also mounted between the objective lens 14 and the objective lens mounting plate 12. The cover plate 15 is mounted on the objective lens 14.

[0038] Among them, the objective lens 14 is a parabolic reflector used to collect and focus light to form a high-quality image. The objective lens 14 is a commonly used device in the field, and the implementation of its corresponding functions are all mature existing technologies. The specific internal structure will not be described in detail here.

[0039] like Figure 5 As shown, the secondary mirror assembly 2 in this embodiment includes a front collar 21, a rear collar 22, a support rod 23, a pull plate 24, a reflector mount 25, a reflector 26, a focusing mechanism mounting plate 27, and a focusing mechanism 28. The second mounting block 10 is installed on the side of the front collar 21 near the middle collar 3. The support rod 23 is installed between the front collar 21 and the rear collar 22. The reflector mount 25 is installed at the center of the rear collar 22 via the pull plate 24. The reflector 26 is installed on the side of the reflector mount 25 near the front collar 21. The focusing mechanism mounting plate 27 is also installed between the front collar 21 and the rear collar 22. The focusing mechanism 28 is installed on the side of the focusing mechanism mounting plate 27 away from the reflector 26.

[0040] The front collar 21 and the rear collar 22 are fixed together by a support rod 23, which serves as the main frame of the secondary lens assembly 2. A reflector 26 is installed at the axial position of the rear collar 22. The angle between the mirror surface of the reflector 26 and the central axis of the objective lens 14 is 45°. The reflector 26 is used to further reflect the light reflected by the objective lens 14 into the focusing mechanism 28.

[0041] like Figure 6 As shown, the focusing mechanism 28 in this embodiment includes a focusing base 281, a focusing unit 282, and an eyepiece unit 283. The focusing base 281 is fixedly installed on the focusing mechanism mounting plate 27. The eyepiece unit 283 is installed inside the focusing base 281, and the focusing unit 282 is installed on the outside of the focusing base 281. The focusing unit 282 is also connected to the eyepiece unit 283 disposed inside the focusing base 281 to adjust the position of the eyepiece unit 283 relative to the focusing base 281.

[0042] The focusing unit 282 is fixedly installed with the focusing base 281, and the eyepiece unit 283 is disposed inside the focusing base 281 and slidably installed therewith. The focusing unit 282 and the eyepiece unit 283 are driven together. Therefore, when focusing is required, the position of the eyepiece unit 283 relative to the focusing base 281 is adjusted by controlling the focusing unit 282. The angle between the optical axis of the eyepiece unit 283 and the mirror surface of the mirror 26 is 45°.

[0043] like Figure 7 As shown, the focusing unit 282 in this embodiment includes a second handwheel 2821, a handwheel seat 2822, and a rotating shaft 2823. The handwheel seat 2822 is installed on the outside of the focusing seat 281, and the rotating shaft 2823 is installed inside the handwheel seat 2822. The rotating shaft 2823 is connected to the eyepiece unit 283 for transmission, and the second handwheel 2821 is installed at both ends of the rotating shaft 2823.

[0044] The rotating shaft 2823 is rotated by rotating the second handwheel 2821. The rotating shaft 2823 is connected to the eyepiece unit 283. Therefore, the rotation of the rotating shaft 2823 can drive the eyepiece unit 283 to move back and forth along the optical axis within the focusing seat 281.

[0045] like Figure 7 As shown, the eyepiece unit 283 in this embodiment includes a focusing tube 2831, an eyepiece base 2832, a first lens 2833, a second lens 2834, a third lens 2835, an extension joint 2836, an eyepiece tube 2837, an eyepiece extension tube 2838, and a toothed plate 2839. The toothed plate 2839 is fixedly installed on the outside of the focusing tube 2831, and the focusing tube 2831 is slidably installed inside the focusing base 281. The outside of the toothed plate 2839 meshes with the rotating shaft 2823. The focusing tube 2831 houses an eyepiece mount 2832. Inside the eyepiece mount 2832, from the image side to the object side, a second lens 2834 and a third lens 2835 are installed sequentially. An extension connector 2836 is installed at the end of the eyepiece mount 2832 near the second lens 2834. Inside the extension connector 2836, an eyepiece extension tube 2838 is installed. Inside the eyepiece extension tube 2838, a first lens 2833 is installed. At the end of the eyepiece extension tube 2838, an eyepiece tube 2837 is installed.

[0046] In this embodiment, a toothed plate 2839 is mounted on the outer side of the focusing tube 2831. The toothed plate 2839 meshes with the rotating shaft 2823, thereby realizing the transmission between the eyepiece unit 283 and the focusing unit 282. In a further embodiment, the object-side optical axis of the first lens 2833 is convex, and the image-side optical axis is also convex. The object-side optical axis of the second lens 2834 is convex, and the image-side optical axis is concave. The object-side optical axis of the third lens 2835 is convex, and the image-side optical axis is concave. In this embodiment, light is reflected by the objective lens 14, and its focal point is at the reflector 26. The light passes through the third lens 2835, the second lens 2834, and the first lens 2833 in sequence through the reflection of the reflector 26 and forms an image. This Newtonian telescope can avoid the chromatic aberration problem in traditional lens telescopes because the reflector does not rely on the refraction of the lens to focus the light. This allows the Newtonian telescope to provide clearer images when observing celestial objects, especially when observing planets, stars, and deep-sky objects.

[0047] In this embodiment, when the telescope is in use, the first handwheel 7 is rotated and released to rotate the flip lever 4, so that the telescope is adjusted from the first state to the second state. This ensures that the side of the flip lever 4 can abut against the limiting port 31 on the middle collar 3. The eyepiece unit 283 can be adjusted directly using the focusing unit 282 for observation without calibrating the optical axis. After use, the first handwheel 7 is released and the flip lever 4 is rotated to adjust the telescope from the second state to the first state before storing it.

[0048] Compared with the prior art, the telescope in this embodiment separates the secondary mirror assembly 2 and the primary mirror assembly 1, and the relative positions of the secondary mirror assembly 2 and the primary mirror assembly 1 can be changed according to the actual situation, which facilitates the storage and use of the telescope. When the secondary mirror assembly 2 rotates, it can be positioned by the limiting port 31 on the middle collar 3 to ensure that the optical axis of the telescope will not shift during use. The entire telescope does not require additional time for calibration during use, and it is small in size and does not take up much space when stored, making it convenient to carry.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A telescope, characterized in that, The telescope includes a primary mirror assembly, a secondary mirror assembly, and a central ring. The primary mirror assembly and the central ring are fixedly installed together by a connecting rod. The telescope also includes a flip rod, the first end of which is fixedly installed with the secondary mirror assembly, and the second end of which is rotatably installed on the outside of the central ring. In a first state, the primary mirror assembly and the secondary mirror assembly are respectively located on both sides of the central ring. In a second state, the primary mirror assembly and the secondary mirror assembly are both located on the same side of the central ring. In both the first and second states, the flip rod is parallel to the axis of the central ring.

2. The telescope according to claim 1, characterized in that, The outer side of the middle collar is provided with an inwardly recessed limiting opening. In the first state, the side of the flipping rod abuts against the limiting opening.

3. The telescope according to claim 1, characterized in that, A first mounting block is installed on the side of the middle collar near the main lens assembly, and the second end of the flip rod is rotatably mounted on the first mounting block via a first handwheel; and / or, A reinforcing rod is detachably installed between the middle collar and the secondary lens assembly. A second mounting block is installed on the opposite side of the secondary lens assembly and the middle collar. In the first state, the two ends of the reinforcing rod are respectively fixedly installed on the second mounting blocks of the secondary lens assembly and the middle collar.

4. The telescope according to claim 1, characterized in that, Ball joints are installed on opposite sides of the primary lens assembly and the middle collar. The connecting rod is installed between the ball joints of the primary lens assembly and the middle collar. A light-shielding tube is installed on the primary lens assembly and the middle collar, and the light-shielding tube is installed on the inner side of the connecting rod.

5. The telescope according to claim 4, characterized in that, The primary lens assembly includes an objective lens ring, an objective lens mounting plate, an objective lens fixing plate, an objective lens, and a cover plate. The ball head is mounted on one side of the objective lens ring. The objective lens mounting plate is mounted at the center of the objective lens ring. The objective lens is mounted at the center of the objective lens mounting plate. The objective lens fixing plate is also mounted between the objective lens and the objective lens mounting plate. The cover plate is mounted on the objective lens.

6. The telescope according to claim 3, characterized in that, The secondary mirror assembly includes a front collar, a rear collar, a support rod, a pull plate, a mirror mount, a mirror, a focusing mechanism mounting plate, and a focusing mechanism. The second mounting block is installed on the side of the front collar near the middle collar. The support rod is installed between the front collar and the rear collar. A mirror mount is installed at the center of the rear collar via the pull plate. A mirror is installed on the side of the mirror mount near the front collar. A focusing mechanism mounting plate is also installed between the front collar and the rear collar. A focusing mechanism is installed on the side of the focusing mechanism mounting plate away from the mirror.

7. The telescope according to claim 6, characterized in that, The focusing mechanism includes a focusing base, a focusing unit, and an eyepiece unit. The focusing base is fixedly mounted on the focusing mechanism mounting plate. The eyepiece unit is installed inside the focusing base and on the outside of the focusing base. The focusing unit is also connected to the eyepiece unit located inside the focusing base to adjust the position of the eyepiece unit relative to the focusing base.

8. The telescope according to claim 7, characterized in that, The focusing unit includes a second handwheel, a handwheel seat, and a rotating shaft. The handwheel seat is installed on the outside of the focusing seat, and the rotating shaft is installed inside the handwheel seat. The rotating shaft is connected to the eyepiece unit for transmission, and the second handwheel is installed at both ends of the rotating shaft.

9. The telescope according to claim 8, characterized in that, The eyepiece unit includes a focusing tube, an eyepiece mount, a first lens, a second lens, a third lens, an extension joint, an eyepiece tube, an eyepiece extension tube, and a toothed plate. The toothed plate is fixedly installed on the outside of the focusing tube, and the focusing tube is slidably installed inside the focusing mount. The outside of the toothed plate engages with the rotating shaft. An eyepiece mount is installed inside the focusing tube. A second lens and a third lens are sequentially installed inside the eyepiece mount from the image side to the object side. An extension joint is installed at the end of the eyepiece mount near the second lens. An eyepiece extension tube is installed inside the extension joint. A first lens is installed inside the eyepiece extension tube. An eyepiece tube is installed at the end of the eyepiece extension tube.

10. The telescope according to claim 9, characterized in that, The first lens has a convex surface at both the object-side optical axis and the image-side optical axis; the second lens has a convex surface at both the object-side optical axis and the image-side optical axis; and the third lens has a convex surface at both the object-side optical axis and the image-side optical axis.

Images