CN219533514U - Sealed astronomical telescope focusing device and astronomical telescope - Google Patents

Abstract

The utility model relates to the field of astronomical observation equipment, in particular to a sealed astronomical telescope focusing device and an astronomical telescope, wherein the focusing device comprises a coarse adjusting component, a fine adjusting component and an objective lens which are arranged in a lens cone, the coarse adjusting component comprises a coarse adjusting sleeve and a coarse adjusting driving unit, and the fine adjusting component comprises a fine adjusting sleeve exchange and a fine adjusting driving unit; transparent sealing elements are arranged at two ends of the lens cone; the fine adjustment sleeve is nested in the coarse adjustment sleeve, and the fine adjustment driving unit can drive the fine adjustment sleeve to move along the axial direction of the coarse adjustment sleeve; the coarse adjustment sleeve is nested in the lens barrel, and the coarse adjustment driving unit can drive the coarse adjustment sleeve to move along the axial direction of the lens barrel; the objective lens is arranged at the end part of one end of the fine adjustment sleeve, a fine adjustment sealing piece is arranged between the outer wall of the fine adjustment sleeve and the inner wall of the coarse adjustment sleeve, and a coarse adjustment sealing piece is arranged between the outer wall of the coarse adjustment sleeve and the inner wall of the lens barrel. The utility model has the effect that the surface of the objective lens in the lens barrel is not easy to have vapor and is stained with dust.

Description

Sealed astronomical telescope focusing device and astronomical telescope

Technical Field

The utility model belongs to the field of astronomical observation equipment, and particularly relates to a sealed astronomical telescope focusing device.

Background

Astronomical telescopes are the main tools for observing astronomical objects and capturing astronomical information, and astronomical telescopes commonly used by astronomical lovers are generally refractive or reflective optical astronomical telescopes.

When the optical astronomical telescope is used, the lens barrel of the astronomical telescope is generally required to be opposite to a place to be observed through the finder, and then the distance between the objective lens and the eyepiece is adjusted to realize focusing, but the existing astronomical telescope generally has only one focusing structure, and the focusing adjustment precision is low, so that some astronomical telescopes are designed to have two focusing structures so as to realize the focusing adjustment with thickness precision and fineness precision.

The Chinese patent with the publication number of CN 218099770U discloses a focusing device for a main focus telescope, wherein a sliding port is formed in the top of a lens main body, and a focusing device connected with an objective lens is arranged in the sliding port.

In view of this, it is desirable to provide a sealed astronomical telescope focusing device.

Disclosure of Invention

In order to improve the above-mentioned drawbacks, the present utility model provides a sealed astronomical telescope focusing device and a sealed astronomical telescope.

The utility model provides a sealed astronomical telescope focusing device, which adopts the following technical scheme.

The sealed astronomical telescope focusing device comprises a coarse adjusting component, a fine adjusting component and an objective lens, wherein the coarse adjusting component, the fine adjusting component and the objective lens are arranged in a lens cone, the coarse adjusting component comprises a coarse adjusting sleeve and a coarse adjusting driving unit, and the fine adjusting component comprises a fine adjusting sleeve and a fine adjusting driving unit; transparent sealing elements are arranged at two ends of the lens barrel; the fine adjustment sleeve is nested in the coarse adjustment sleeve, and the fine adjustment driving unit is configured to drive the fine adjustment sleeve to move along the axial direction of the coarse adjustment sleeve; the coarse adjustment sleeve is nested in the lens barrel, and the coarse adjustment driving unit is configured to drive the coarse adjustment sleeve to move along the axial direction of the lens barrel; the objective lens is arranged at the end part of one end of the fine adjustment sleeve, a fine adjustment sealing piece is arranged between the two ends of the outer wall of the fine adjustment sleeve and the inner wall of the coarse adjustment sleeve, and a coarse adjustment sealing piece is arranged between the two ends of the outer wall of the coarse adjustment sleeve and the inner wall of the lens barrel.

Through adopting the technical scheme, the objective lens is arranged at the end part of one end of the fine adjustment sleeve, the fine adjustment sleeve is nested in the coarse adjustment sleeve, the coarse adjustment sleeve is nested in the lens cone, the fine adjustment driving unit can drive the fine adjustment sleeve to move along the axial direction of the coarse adjustment sleeve, and the coarse adjustment driving unit can drive the coarse adjustment sleeve to move along the axial direction of the lens cone, so that the objective lens can be subjected to two-stage adjustment of thickness, and the focusing effect is better; the lens cone can be closed through setting up transparent sealing member at the both ends of lens cone, and can not influence the printing opacity of lens cone, in addition, be equipped with the fine adjustment sealing member between the both ends of fine adjustment sleeve's outer wall and the inner wall of rough adjustment sleeve, be equipped with the coarse adjustment sealing member between the both ends of rough adjustment sleeve's outer wall and the inner wall of lens cone, consequently, can guarantee that external steam does not invade the inside of lens cone to can prevent that the objective from being in the one side of lens cone from fogging and even appearing the condition of mildewing, in order to do benefit to astronomical telescope's long-term preservation and use.

Specifically, the coarse adjustment driving unit is arranged on the outer wall of the lens barrel, and the fine adjustment driving unit is arranged on the outer wall of the coarse adjustment sleeve; the side wall of the lens cone is provided with a coarse adjustment window, and the side wall of the coarse adjustment sleeve is provided with a fine adjustment window at a position corresponding to the coarse adjustment window.

Through adopting above-mentioned technical scheme, can be convenient for coarse tuning drive unit and coarse tuning sleeve connection to and fine tuning drive unit and fine tuning sleeve connection, in order to can realize the regulation to the distance between objective and the eyepiece.

Specifically, a coarse adjustment guide groove extending along the axial direction of the lens barrel is formed in the inner wall of the lens barrel, and a coarse adjustment limiting protrusion matched with the coarse adjustment guide groove is formed in the outer wall of the coarse adjustment sleeve.

Through adopting above-mentioned technical scheme, can realize the spacing to coarse adjustment sleeve for coarse adjustment sleeve is difficult for taking place the skew when removing along the lens cone, thereby can guarantee optical imaging effect, and coarse adjustment sleeve also is difficult for taking place to rotate when removing along the lens cone, makes coarse adjustment sealing member difficult impaired.

Specifically, the position department that corresponds with the coarse adjustment window on the outer wall of coarse adjustment sleeve still is equipped with the coarse adjustment rack of axial extension along the lens-barrel, coarse adjustment drive unit includes adjust knob, knob pivot, knob bearing frame and adjusting gear, the knob bearing frame is located on the outer wall of lens-barrel, the rotatable connection of knob pivot is in on the knob bearing frame, just the one end of knob pivot with adjust knob is connected, the other end with adjusting gear connects, coarse adjustment rack is followed coarse adjustment window department wears out and with adjusting gear connects.

Through adopting above-mentioned technical scheme, can realize the telescopic quick travel adjustment of coarse adjustment to can preliminary quick realization focus's regulation.

Specifically, be equipped with on the inner wall of coarse adjustment sleeve along this coarse adjustment sleeve's axial extension's fine tuning guide way, be equipped with on the outer wall of fine tuning sleeve with fine tuning guide way assorted fine tuning spacing arch.

Through adopting above-mentioned technical scheme, can realize the spacing to the fine adjustment sleeve for the fine adjustment sleeve is difficult for taking place the skew when removing along coarse adjustment sleeve, thereby can guarantee the optical imaging effect, and the fine adjustment sleeve also is difficult for taking place to rotate when removing along the lens cone, makes the fine adjustment sealing member be difficult for impaired.

Specifically, the position department that corresponds with the fine adjustment window on the external wall of fine adjustment sleeve still is equipped with the connecting seat, the fine adjustment drive unit includes adjusting screw, screw rod knob and screw rod bearing frame, the screw rod bearing frame is located on the external wall of coarse adjustment sleeve, adjusting screw rotatable coupling is in on the screw rod bearing frame, adjusting screw's one end with the screw rod knob is connected, the connecting seat is followed fine adjustment window department wears out, just the connecting seat wear out with fine adjustment window's one end be equipped with be suitable for with adjusting screw assorted internal thread hole, in order to via internal thread hole with adjusting screw connects.

Through adopting above-mentioned technical scheme, can realize fine adjustment telescopic slowly moving and adjust, and the regulation precision of moving quantity is high to can realize the high accuracy of focal length and adjust, imaging quality is better.

The astronomical telescope provided by the second aspect of the utility model adopts the following technical scheme.

The astronomical telescope comprises an eyepiece, a sealed astronomical telescope focusing device and a lens cone, wherein the sealed astronomical telescope focusing device and the lens cone are in the technical scheme, the eyepiece is connected with one end of the lens cone, and the objective lens is arranged at the end part, far away from one end of the eyepiece, of the fine adjustment sleeve.

By adopting the technical scheme, the astronomical telescope is provided with the sealed astronomical telescope focusing device and the lens cone, so that the astronomical telescope is provided with all the technical advantages of the sealed astronomical telescope focusing device, the required length of the lens cone is shorter, and the whole structure of the astronomical telescope is more compact.

Further, the lens cone is divided into an objective end sealing cavity and an eyepiece end sealing cavity by the sealed astronomical telescope focusing device, an air guide pipeline is further arranged in the cylinder wall of the lens cone, one end of the air guide pipeline is connected with the objective end sealing cavity, and the other end of the air guide pipeline is connected with the eyepiece end sealing cavity.

Through adopting above-mentioned technical scheme for the objective is at the in-process that removes, can realize gaseous exchange between two cavities of objective, with the balance that can maintain atmospheric pressure, prevents to appear the too big transparent sealing member of pressure and the condition that the objective drops.

In summary, the utility model has the following beneficial technical effects:

1. the objective lens is arranged at the end part of one end of the fine adjustment sleeve, the fine adjustment sleeve is nested in the coarse adjustment sleeve, the coarse adjustment sleeve is nested in the lens cone, the fine adjustment driving unit can drive the fine adjustment sleeve to move along the axial direction of the coarse adjustment sleeve, and the coarse adjustment driving unit can drive the coarse adjustment sleeve to move along the axial direction of the lens cone, so that the objective lens can be subjected to two-stage adjustment of the coarse and fine adjustment, and the focusing effect is better;

2. the lens cone can be sealed by arranging the transparent sealing pieces at the two ends of the lens cone, the light transmission of the lens cone cannot be influenced, in addition, the fine adjustment sealing pieces are arranged between the two ends of the outer wall of the fine adjustment sleeve and the inner wall of the coarse adjustment sleeve, and the coarse adjustment sealing pieces are arranged between the two ends of the outer wall of the coarse adjustment sleeve and the inner wall of the lens cone, so that external water vapor can be prevented from invading into the lens cone, and the situation that one surface of the objective lens in the lens cone is fogged or even mildewed can be prevented, so that the astronomical telescope can be stored and used for a long time;

3. in the moving process of the objective lens, gas exchange can be realized between the cavities at the two ends of the objective lens, so that the balance of air pressure can be maintained, and the situation that the transparent sealing element with overlarge pressure and the objective lens fall off is prevented.

Drawings

Fig. 1 is a schematic perspective view of a sealed astronomical telescope focusing device (and astronomical telescope) according to the present utility model.

Fig. 2 is a top view of the sealed astronomical telescope focusing device (and astronomical telescope) of the present utility model.

Fig. 3 is an enlarged cross-sectional view taken in the direction A-A of fig. 2.

Fig. 4 is a partial cross-sectional view in the direction B-B of fig. 3.

Fig. 5 is a partial cross-sectional view in the direction C-C of fig. 3.

Fig. 6 is an enlarged view of region F in fig. 5.

Fig. 7 is an enlarged view of the region G in fig. 6.

Fig. 8 is an enlarged view of the region D in fig. 4.

Fig. 9 is an enlarged view of the area E in fig. 4.

Reference numerals: 1. a coarse adjustment assembly; 11. a coarse tuning sleeve; 111. finely adjusting the window; 112. coarse adjustment limiting protrusions; 113. coarse adjusting the rack; 114. fine tuning guide grooves; 12. a coarse adjustment driving unit; 121. an adjustment knob; 122. a knob shaft; 123. knob bearing seat; 124. an adjusting gear; 13. coarsely adjusting the seal; 2. a fine adjustment assembly; 21. fine tuning the sleeve; 211. fine adjustment limiting protrusions; 212. a connecting seat; 22. a fine adjustment driving unit; 221. adjusting a screw; 222. a screw knob; 223. a screw bearing seat; 23. fine-tuning the seal; 3. an objective lens; 4. a lens barrel; 41. a transparent seal; 42. coarsely adjusting a window; 43. a rough adjustment guide groove; 44. an objective lens end sealing cavity; 45. an eyepiece end sealing cavity; 46. an air guide pipeline; 5. an eyepiece.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-9.

The utility model discloses a sealed astronomical telescope focusing device.

Referring to fig. 1 and 2, a sealed astronomical telescope focusing device comprises a coarse adjusting assembly 1 and a fine adjusting assembly 2 which are arranged in a lens barrel 4, specifically, as shown in fig. 3 and 4, the coarse adjusting assembly 1 comprises a coarse adjusting sleeve 11 and a coarse adjusting driving unit 12, the fine adjusting assembly 2 comprises a fine adjusting sleeve 21 and a fine adjusting driving unit 22, the coarse adjusting sleeve 11 is driven by the coarse adjusting driving unit 12 to move along the axial direction of the lens barrel 4, and the fine adjusting sleeve 21 is driven by the fine adjusting driving unit 22 to move along the axial direction of the coarse adjusting sleeve 11, so that two kinds of progress adjustment can be carried out on an objective lens 3, and focusing speed and progress can be considered.

Specifically, as shown in fig. 3 and 5, the fine adjustment sleeve 21 is nested in the coarse adjustment sleeve 11, the coarse adjustment sleeve 11 is nested in the lens barrel 4, the fine adjustment driving unit 22 is configured to drive the fine adjustment sleeve 21 to move along the axial direction of the coarse adjustment sleeve 11, the coarse adjustment driving unit 12 is configured to drive the coarse adjustment sleeve 11 to move along the axial direction of the lens barrel 4, wherein the objective lens 3 is arranged at one end of the fine adjustment sleeve 21, as shown in fig. 5 and 6, transparent sealing members 41 are arranged at two ends of the lens barrel 4, the two ends of the lens barrel 4 can realize the sealing of the lens barrel 4 without affecting the light transmission of the lens barrel 4, and in addition, as shown in fig. 7, a coarse adjustment sealing member 13 is arranged between two ends of the outer wall of the fine adjustment sleeve 21 and the inner wall of the coarse adjustment sleeve 11, so that external vapor is prevented from invading into the interior of the lens barrel 4, and the objective lens 3 can be prevented from fogging or even mildew on one side in the lens barrel 4, so as to be beneficial to the long-term storage and use of the astronomical telescope.

Further, the fine adjustment sealing member 23 and the coarse adjustment sealing member 13 may be provided with rubber sealing rings, and both ends of the outer wall of the fine adjustment sleeve 21 may be provided with grooves arranged around the circumference of the fine adjustment sleeve 21 for accommodating the fine adjustment sealing member 23, so that when the fine adjustment sleeve 21 and the coarse adjustment sleeve 11 are relatively displaced, the fine adjustment sealing member 23 is not easily displaced, so as to ensure the sealing effect, and similarly, both ends of the outer wall of the coarse adjustment sleeve 11 may be provided with grooves arranged around the circumference of the coarse adjustment sleeve 11 for accommodating the coarse adjustment sealing member 13, so that when the coarse adjustment sleeve 11 and the lens barrel 4 are relatively displaced, the coarse adjustment sealing member 13 is not easily displaced, so as to ensure the sealing effect; the transparent sealing member 41 should be provided as an optical lens of glass material, and the optical lens should be a flat mirror.

Referring to fig. 3, in an embodiment of the sealed astronomical telescope focusing device of the present utility model, a coarse adjustment driving unit 12 may be disposed on an outer wall of a lens barrel 4, a fine adjustment driving unit 22 may be disposed on an outer wall of a coarse adjustment sleeve 11, and a fine adjustment driving unit 22 may be disposed on an outer wall of the coarse adjustment sleeve 11, so that the fine adjustment driving unit 22 and the fine adjustment sleeve 21 may move synchronously with the coarse adjustment sleeve 11, so as to facilitate quick preliminary focusing; a coarse adjustment window 42 needs to be provided on the side wall of the lens barrel 4, and a fine adjustment window 111 needs to be provided on the side wall of the coarse adjustment sleeve 11 at a position corresponding to the coarse adjustment window 42, so that connection between the coarse adjustment drive unit 12 and the coarse adjustment sleeve 11 and connection between the fine adjustment drive unit 22 and the fine adjustment sleeve 21 are achieved, thereby enabling focusing.

Further, referring to fig. 3 and 4, in an embodiment of the sealed astronomical telescope focusing device of the present utility model, a coarse adjustment guiding groove 43 extending along an axial direction of the lens barrel 4 is provided on an inner wall of the lens barrel 4, a coarse adjustment limiting protrusion 112 matching with the coarse adjustment guiding groove 43 is provided on an outer wall of the coarse adjustment sleeve 11, a fine adjustment guiding groove 114 extending along the axial direction of the coarse adjustment sleeve 11 is provided on an inner wall of the coarse adjustment sleeve 11, a fine adjustment limiting protrusion 211 matching with the fine adjustment guiding groove 114 is provided on an outer wall of the fine adjustment sleeve 21, and limiting of the coarse adjustment sleeve 11 and the fine adjustment sleeve 21 can be achieved, so that the coarse adjustment sleeve 11 is not easy to deflect and rotate when moving along the lens barrel 4 and the fine adjustment sleeve 21 moves along the coarse adjustment sleeve 11, thereby ensuring an optical imaging effect, and ensuring a sealing effect when the coarse adjustment sealing element 13 and the fine adjustment sealing element 23 are not easy to distort and damage occurs.

It will be appreciated that the fine tuning guide slot 114 formed on the inner wall of the coarse tuning sleeve 11 coincides with the coarse tuning limit protrusion 112 formed on the outer wall of the coarse tuning sleeve 11, that is, the coarse tuning sleeve 11 is a shell sleeve structure, and may be punched from the inner wall to the outer wall of the coarse tuning sleeve 11 by punching to form the fine tuning guide slot 114 on the inner wall and the coarse tuning limit protrusion 112 on the outer wall.

Further, referring to fig. 3 and 4, in an embodiment of the sealed astronomical telescope focusing device of the present utility model, a coarse adjustment rack 113 extending along the axial direction of the lens barrel 4 is further provided on the outer wall of the coarse adjustment sleeve 11 at a position corresponding to the coarse adjustment window 42, the coarse adjustment driving unit 12 includes an adjustment knob 121, a knob rotation shaft 122, a knob bearing seat 123 and an adjustment gear 124, the knob bearing seat 123 is provided on the outer wall of the lens barrel 4, the knob rotation shaft 122 is rotatably connected to the knob bearing seat 123, one end thereof is connected to the adjustment knob 121, the other end thereof is connected to the adjustment gear 124, and the coarse adjustment rack 113 penetrates from the coarse adjustment window 42 and is connected to the adjustment gear 124, thereby enabling the coarse adjustment of the coarse adjustment sleeve 11 by rotating the adjustment knob 121 and enabling the fine adjustment sleeve 21 and the objective lens 3 provided on the fine adjustment sleeve 21 to be quickly moved to the vicinity of the position to be adjusted by the transmission form of the rack gear.

Further, referring to fig. 3 and 5, in an embodiment of the sealed astronomical telescope focusing device of the present utility model, a connecting seat 212 is further provided on the outer wall of the fine adjustment sleeve 21 at a position corresponding to the fine adjustment window 111, the fine adjustment driving unit 22 includes an adjusting screw 221, a screw knob 222 and a pair of screw bearing seats 223, the screw bearing seats 223 are provided on the outer wall of the coarse adjustment sleeve 11, specifically, one screw bearing seat 223 is provided at each of two ends of the fine adjustment window 111 along the axial direction of the fine adjustment sleeve 21, the adjusting screw 221 is rotatably connected to the screw bearing seat 223, one end of the adjusting screw 221 is connected to the screw knob 222, the connecting seat 212 penetrates out from the fine adjustment window 111, and one end of the connecting seat 212 penetrating out of the fine adjustment window 111 is provided with an internal threaded hole adapted to be matched with the adjusting screw 221, so as to be connected to the adjusting screw 221 via the internal threaded hole, thereby enabling high-precision movement adjustment of the fine adjustment sleeve 21 in a screw transmission manner by rotating the screw knob 222, thereby enabling high-precision focusing to be achieved, and better imaging effect.

Further, a second aspect of the utility model discloses an astronomical telescope.

Referring to fig. 1, an astronomical telescope comprises an eyepiece 5 and a sealed astronomical telescope focusing device and a lens cone 4 in the above technical scheme, wherein the eyepiece 5 is connected with one end of the lens cone 4, and an objective lens 3 is arranged at the end part of the fine adjustment sleeve 21, which is far away from one end of the eyepiece 5, so that the required length of the lens cone 4 is shorter, and the overall structure of the astronomical telescope is more compact.

Further, referring to fig. 4 and 5, in an embodiment of the astronomical telescope according to the present utility model, the lens barrel 4 is divided into an objective end sealing cavity 44 and an eyepiece end sealing cavity 45 by the sealed astronomical telescope focusing device, and as shown in fig. 8 and 9, an air duct 46 is further provided in the barrel wall of the lens barrel 4, one end of the air duct 46 is connected with the objective end sealing cavity 44, and the other end is connected with the eyepiece end sealing cavity 45, so that during the movement of the objective 3, gas exchange can be realized between the two cavities of the objective 3, so as to maintain air pressure balance, and prevent the occurrence of the condition that the transparent sealing element 41 with excessive pressure and the objective 3 fall off.

The implementation principle of the sealed astronomical telescope focusing device provided by the embodiment of the utility model is as follows: the objective lens 3 is arranged at the end part of one end of the fine adjustment sleeve 21, the fine adjustment sleeve 21 is nested in the coarse adjustment sleeve 11, the coarse adjustment sleeve 11 is nested in the lens cone 4, the fine adjustment driving unit 22 can drive the fine adjustment sleeve 21 to move along the axial direction of the coarse adjustment sleeve 11, and the coarse adjustment driving unit 12 can drive the coarse adjustment sleeve 11 to move along the axial direction of the lens cone 4, so that the objective lens 3 can be subjected to two-stage adjustment, and the focusing effect can be better.

The lens cone 4 can be sealed at both ends through setting up transparent sealing member 41, and can not influence the printing opacity of lens cone 4, in addition, be equipped with fine adjustment sealing member 23 between the both ends of the outer wall of fine adjustment sleeve 21 and the inner wall of coarse adjustment sleeve 11, be equipped with coarse adjustment sealing member 13 between the both ends of the outer wall of coarse adjustment sleeve 11 and the inner wall of lens cone 4, consequently, can guarantee that external steam does not invade the inside of lens cone 4, thereby can prevent that objective 3 is in the one side of lens cone 4 and foggy the condition of mildewing appears even, in order to do benefit to astronomical telescope's long-term storage and use.

During the movement of the objective lens 3, the air exchange between the two end chambers of the objective lens 3 can be realized, so that the balance of air pressure can be maintained, and the situation that the transparent sealing member 41 with overlarge pressure and the objective lens 3 fall off is prevented.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (8)

1. A sealed astronomical telescope focusing device is characterized in that: the lens barrel comprises a coarse adjusting component (1), a fine adjusting component (2) and an objective lens (3) which are arranged in a lens barrel (4), wherein the coarse adjusting component (1) comprises a coarse adjusting sleeve (11) and a coarse adjusting driving unit (12), and the fine adjusting component (2) comprises a fine adjusting sleeve (21) and a fine adjusting driving unit (22); transparent sealing elements (41) are arranged at two ends of the lens cone (4);

the fine adjustment sleeve (21) is nested in the coarse adjustment sleeve (11), and the fine adjustment driving unit (22) is configured to drive the fine adjustment sleeve (21) to move along the axial direction of the coarse adjustment sleeve (11); the coarse adjustment sleeve (11) is nested in the lens barrel (4), and the coarse adjustment driving unit (12) is configured to drive the coarse adjustment sleeve (11) to move along the axial direction of the lens barrel (4);

the objective lens (3) is arranged at the end part of one end of the fine adjustment sleeve (21), a fine adjustment sealing piece (23) is arranged between the two ends of the outer wall of the fine adjustment sleeve (21) and the inner wall of the coarse adjustment sleeve (11), and a coarse adjustment sealing piece (13) is arranged between the two ends of the outer wall of the coarse adjustment sleeve (11) and the inner wall of the lens barrel (4).

2. The sealed astronomical telescope focusing device according to claim 1, wherein: the coarse adjustment driving unit (12) is arranged on the outer wall of the lens barrel (4), and the fine adjustment driving unit (22) is arranged on the outer wall of the coarse adjustment sleeve (11); a coarse adjustment window (42) is arranged on the side wall of the lens cone (4), and a fine adjustment window (111) is arranged on the side wall of the coarse adjustment sleeve (11) at a position corresponding to the coarse adjustment window (42).

3. The sealed astronomical telescope focusing device according to claim 2, wherein: the inner wall of the lens cone (4) is provided with a rough adjustment guide groove (43) extending along the axial direction of the lens cone (4), and the outer wall of the rough adjustment sleeve (11) is provided with a rough adjustment limit protrusion (112) matched with the rough adjustment guide groove (43).

4. A sealed astronomical telescope focusing device according to claim 2 or 3, characterized in that: the outer wall of the coarse adjustment sleeve (11) is provided with a coarse adjustment rack (113) extending along the axial direction of the lens cone (4) at a position corresponding to the coarse adjustment window (42), the coarse adjustment driving unit (12) comprises an adjustment knob (121), a knob rotating shaft (122), a knob bearing seat (123) and an adjustment gear (124), the knob bearing seat (123) is arranged on the outer wall of the lens cone (4), the knob rotating shaft (122) is rotatably connected to the knob bearing seat (123), one end of the knob rotating shaft (122) is connected with the adjustment knob (121), the other end of the knob rotating shaft is connected with the adjustment gear (124), and the coarse adjustment rack (113) penetrates out from the position of the coarse adjustment window (42) and is connected with the adjustment gear (124).

5. The sealed astronomical telescope focusing device according to claim 2, wherein: the inner wall of the rough adjustment sleeve (11) is provided with a fine adjustment guide groove (114) extending along the axial direction of the rough adjustment sleeve (11), and the outer wall of the fine adjustment sleeve (21) is provided with a fine adjustment limit protrusion (211) matched with the fine adjustment guide groove (114).

6. The sealed astronomical telescope focusing device according to claim 5, wherein: the utility model discloses a fine adjustment drive unit, including fine adjustment sleeve (21), fine adjustment drive unit (22) are located on the outer wall of fine adjustment sleeve (21), with the position department that fine adjustment window (111) corresponds still is equipped with connecting seat (212), fine adjustment drive unit (22) are including adjusting screw (221), screw knob (222) and screw bearing frame (223), screw bearing frame (223) are located on the outer wall of coarse adjustment sleeve (11), adjusting screw (221) rotatable coupling is in on screw bearing frame (223), the one end of adjusting screw (221) with screw knob (222) are connected, connecting seat (212) are worn out from fine adjustment window (111), just connecting seat (212) wear out with the one end of fine adjustment window (111) be equipped with be suitable for with adjusting screw (221) assorted internal thread hole, so that via internal thread hole with adjusting screw (221) are connected.

7. An astronomical telescope, characterized in that: the sealed astronomical telescope focusing device comprises an eyepiece (5) and any one of claims 1 to 6, and a lens cone (4), wherein the eyepiece (5) is connected with one end of the lens cone (4), and the objective lens (3) is arranged at the end part, far away from one end of the eyepiece (5), of the fine adjustment sleeve (21).

8. An astronomical telescope according to claim 7, characterized in that: the lens cone (4) is divided into an objective lens end sealing cavity (44) and an eyepiece lens end sealing cavity (45) by the sealed astronomical telescope focusing device, an air guide pipeline (46) is further arranged in the cylinder wall of the lens cone (4), one end of the air guide pipeline (46) is connected with the objective lens end sealing cavity (44), and the other end of the air guide pipeline is connected with the eyepiece lens end sealing cavity (45).