Spiral telescope focusing mechanism

Abstract

The utility model relates to the technical field of telescopes, in particular to a spiral telescope focusing mechanism, which comprises a rear ferrule, a central groove is arranged on the rear ferrule, an adjusting joint is sleeved in the central groove, the adjusting joint and the central groove are coaxially arranged, and a focusing tube is sleeved in the adjusting joint. According to the utility model, the focusing tube and other parts are arranged, the power assembly provides a power source for the driving part to rotate, the driving part rotates to enable the focusing tube to move, the focusing function is further realized, the driving part and the focusing tube are in threaded connection, and the connection mode has certain self-locking performance, so that when the focusing tube is adjusted to a required position, the focusing tube can be moved to the required position, and the focusing function is realized. The focusing tube is not easy to slip even under the action of an external load (such as the weight of a camera), the stability of the focal length is ensured, meanwhile, compared with a traditional linear guide rail, the spiral focusing mechanism adopts a simpler structure, the assembling and adjusting processes are simplified, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to telescope technical field especially relates to a screw type telescope focusing mechanism. BACKGROUND

[0002] The optical imaging system of the telescope has a wide application in the fields of military and civil, and therefore the indexes such as the optical imaging precision and the imaging quality of the telescope are particularly important. Under the condition that the mechanical structure and the optical structure meet the requirements, the precision of the focusing device also greatly affects the precision of the optical imaging system.

[0003] At present, the general focusing device is driven by rotating the gear shaft through the hand wheel to drive the rack installed on the focusing tube, so as to drive the focusing tube to move forward and backward for focusing. In order to ensure the movement of the focusing tube along the axis, a linear guide rail needs to be installed, which makes the assembly and adjustment process more complicated and increases the cost. At the same time, this kind of transmission does not have self-locking function, and when the camera is loaded on the focusing tube, the focusing tube is easily slipped. In view of this, the utility model provides a screw type telescope focusing mechanism to solve the above technical problems. UTILITY MODEL CONTENT

[0004] In order to overcome the technical problems in the background art, the utility model provides a screw type telescope focusing mechanism.

[0005] The technical scheme is: a screw type telescope focusing mechanism, comprising a rear sleeve ring;

[0006] An adjusting joint is provided on the rear sleeve ring, and the adjusting joint is coaxially arranged in the central groove;

[0007] A focusing tube is arranged in the adjusting joint, and a guide groove is arranged on the focusing tube; a guide pin is fixedly connected in the adjusting joint, and the guide pin cooperates with the guide groove to enable the focusing tube to slide linearly along the axial direction relative to the adjusting joint;

[0008] A driving member is threadedly connected with the focusing tube, and the driving member is provided with power by a power assembly to realize rotation.

[0009] Further, the driving member comprises a large synchronous wheel, the large synchronous wheel is threadedly connected with the focusing tube, the power assembly comprises a small synchronous wheel, a synchronous belt, a stepping motor and a manual focusing hand wheel, the stepping motor is installed on the rear sleeve ring, a small synchronous wheel is fixedly connected on the output shaft of the stepping motor, the small synchronous wheel is connected with the large synchronous wheel through the synchronous belt, and a manual focusing hand wheel is fixedly connected on the rotating shaft of the small synchronous wheel.

[0010] Further, the power assembly further comprises a rotating shaft, a tensioner, an adjusting screw and a connecting plate, the rotating shaft is fixedly connected to the rear collar, the connecting plate is rotationally connected to the rotating shaft, the tensioner is fixedly connected to the connecting plate, and the adjusting screw is threadedly connected to the rear collar and abuts against the connecting plate.

[0011] Further, the first screw and the second screw are uniformly distributed in the central groove, the adjusting joint is fixedly connected to the rear collar through the first screw, and the second screw is used for adjusting the inclination angle of the adjusting joint and is threadedly connected with the adjusting joint.

[0012] Further, the focusing tube is sleeved with a camera joint, and the camera joint is coaxially arranged with the focusing tube.

[0013] Further, the rear collar is fixedly connected with a protective cover for protecting internal parts.

[0014] Further, the manual focusing hand wheel can be used alone to realize manual focusing.

[0015] Further, electric focusing can be realized when the stepping motor is powered on, and manual focusing can be realized through the manual focusing hand wheel when the stepping motor is powered off.

[0016] Beneficial effects: the utility model discloses a focusing tube and other components, and the power assembly is used as a driving element to provide a power source for rotation, and then the driving element rotates to move the focusing tube, thereby realizing the focusing function, since the driving element and the focusing tube are connected through threads, the connection has certain self-locking property, when the focusing tube is adjusted to the required position, even if the focusing tube is affected by external load (such as the weight of the camera), the focusing tube is not easy to slip off, and the stability of focal length is ensured, compared with the traditional linear guide rail, the spiral focusing mechanism adopts a simpler structure, simplifies the assembly and adjustment process, and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0018] Figure 2 It is a schematic view of the small synchronous wheel and the tensioner and other components of the utility model.

[0019] Figure 3 It is another schematic view of the small synchronous wheel and the tensioner and other components of the utility model.

[0020] Figure 4 It is an explosion view of the utility model.

[0021] Figure 5 It is a sectional view of the utility model.

[0022] Meaning of reference signs in the figures: 101, rear collar, 1011, central groove, 102, adjusting joint, 103, focusing tube, 1031, guide groove, 104, camera joint, 105, protective cover, 106, first screw, 107, second screw, 108, rotating shaft, 109, connecting plate, 110, adjusting screw, 111, tension pulley, 112, guide pin, 201, large synchronizing wheel, 202, small synchronizing wheel, 203, synchronizing belt, 204, stepping motor, 205, manual focusing hand wheel. DETAILED DESCRIPTION

[0023] Reference herein to an embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combinable with other embodiments.

[0024] A helical telescope focusing mechanism, such as Figures 1-5As shown, including the rear collar 101, the rear collar 101 is provided with a central groove 1011, the central groove 1011 is provided with an adjusting joint 102, the adjusting joint 102 is coaxially arranged with the central groove 1011, the adjusting joint 102 is provided with a focusing tube 103, the focusing tube 103 is provided with a guide groove 1031, the adjusting joint 102 is fixedly connected with a guide pin 112, the guide pin 112 cooperates with the guide groove 1031 to make the focusing tube 103 only be able to slide linearly along the axial direction relative to the adjusting joint 102, the driving part is threadedly connected with the focusing tube 103, the driving part is provided with power by the power assembly to realize rotation, the central groove 1011 is uniformly provided with a first screw 106 and a second screw 107, the adjusting joint 102 is fixedly connected with the rear collar 101 through the first screw 106, the second screw 107 is used for adjusting the inclination angle of the adjusting joint 102 and is threadedly connected with the adjusting joint 102, when the adjusting joint 102 is found to be slightly inclined, the second screw 107 can be rotated, and then the second screw 107 will pull the adjusting joint 102 to adjust the inclination angle of the adjusting joint 102, the focusing tube 103 is provided with a camera joint 104, the camera joint 104 is coaxially arranged with the focusing tube 103, further comprising a protective cover 113, the rear collar 101 is fixedly connected with the protective cover 113 for protecting the internal parts, therefore, the driving part is provided with a power source by the power assembly to rotate, and then the driving part rotates to make the focusing tube 103 move left and right, thereby realizing the focusing function, since the driving part and the focusing tube 103 are threadedly connected, the connecting mode has certain self-locking property, when the focusing tube 103 is adjusted to the required position, even if affected by external load (such as the weight of the camera), the focusing tube is not easy to slip off, which ensures the stability of the focal length, compared with the traditional linear guide rail, the screw type focusing mechanism adopts a simpler structure, simplifies the assembly and adjustment process, and reduces the cost.

[0025] The driving components include a large synchronous pulley 201, which is threadedly connected to the focusing tube 103. The power components include a small synchronous pulley 202, a synchronous belt 203, a stepper motor 204, and a manual focusing handwheel 205. The stepper motor 204 is mounted on the rear collar 101. The small synchronous pulley 202 is fixedly connected to the output shaft of the stepper motor 204. The small synchronous pulley 202 is connected to the large synchronous pulley 201 via the synchronous belt 203. The manual focusing handwheel 205 is fixedly connected to the shaft 108 of the small synchronous pulley 202. This enables electric focusing when the stepper motor 204 is energized. When the stepper motor 204 is powered off, manual focusing is achieved through the manual focusing handwheel 205. Thus, when electric focusing is required, the stepper motor 204 is started, and the output shaft of the stepper motor 204 drives the small synchronous pulley 202 to rotate. The small synchronous pulley 202 then drives the large synchronous pulley 201 to rotate through the synchronous belt 203. The rotation of the large synchronous pulley 201 causes the focusing tube 103 to move, thereby achieving the focusing function. When manual focusing is required, rotating the manual focusing handwheel 205 will also cause the small synchronous pulley 202 to rotate, thus providing a dual focusing function.

[0026] The power assembly also includes a rotating shaft 108, a tensioning wheel 111, an adjusting screw 110, and a connecting plate 109. The rotating shaft 108 is fixedly connected to the rear collar 101, and the connecting plate 109 is rotatably connected to the rotating shaft 108. The tensioning wheel 111 is fixedly connected to the connecting plate 109. The adjusting screw 110 is threadedly connected to the rear collar 101. The adjusting screw 110 abuts against the connecting plate 109. Thus, rotating the adjusting screw 110 causes the adjusting screw 110 to abut against the connecting plate 109, which in turn causes the tensioning wheel 111 to contact the timing belt 203, thereby tensioning the timing belt 203 and preventing the timing belt from loosening.

[0027] In other embodiments, the driving component may be a large gear, which is threadedly connected to the focusing tube 103. The power assembly may include a gear set and a stepper motor 204. Both the stepper motor 204 and the gear set are mounted on the rear collar 101. The output shaft of the stepper motor 204 is fixedly connected to one of the gears in the gear set. The large gear and the gear set mesh with each other. Thus, when the stepper motor 204 is started, the output shaft of the stepper motor 204 drives the gear set to rotate, which in turn drives the large gear to rotate. The rotation of the large gear causes the focusing tube 103 to move left and right, thereby realizing the focusing function.

[0028] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A focusing mechanism for a helical telescope, characterized by, Including rear collar (101); Adjusting joint (102), the rear collar (101) is provided with a center groove (1011), the adjusting joint (102) is arranged in the center groove (1011), and the adjusting joint (102) is coaxially arranged with the center groove (1011); Focus tube (103), the adjusting joint (102) is provided with a focus tube (103), the focus tube (103) is provided with a guide groove (1031), the adjusting joint (102) is fixedly connected with a guide pin (112), and the guide pin (112) is matched with the guide groove (1031) to make the focus tube (103) only be able to slide linearly along the axial direction relative to the adjusting joint (102); The driving part is threadedly connected with the focus tube (103), and the driving part is powered by a power assembly to realize rotation.

2. A helical focusing mechanism for a telescope according to claim 1, wherein The driving part includes a large synchronous wheel (201), the large synchronous wheel (201) is threadedly connected with the focus tube (103), the power assembly includes a small synchronous wheel (202), a synchronous belt (203), a stepping motor (204) and a manual focusing hand wheel (205), the stepping motor (204) is installed on the rear collar (101), a small synchronous wheel (202) is fixedly connected to the output shaft of the stepping motor (204), the small synchronous wheel (202) is connected with the large synchronous wheel (201) through the synchronous belt (203), and the manual focusing hand wheel (205) is fixedly connected to the rotating shaft (108) of the small synchronous wheel (202).

3. A helical telescope focusing mechanism according to claim 2, wherein The power assembly further includes a rotating shaft (108), a tensioner (111), an adjusting screw (110) and a connecting plate (109), the rotating shaft (108) is fixedly connected to the rear collar (101), the connecting plate (109) is rotatably connected to the rotating shaft (108), the tensioner (111) is fixedly connected to the connecting plate (109), and the adjusting screw (110) is threadedly connected to the rear collar (101) and abuts against the connecting plate (109).

4. A helical telescope focusing mechanism according to claim 3, wherein The center groove (1011) is uniformly provided with a first screw (106) and a second screw (107), the adjusting joint (102) is fixedly connected to the rear collar (101) through the first screw (106), and the second screw (107) is used for adjusting the inclination angle of the adjusting joint (102) and is threadedly connected with the adjusting joint (102).

5. A helical telescope focusing mechanism according to claim 1, wherein The focus tube (103) is provided with a camera joint (104), and the camera joint (104) is coaxially arranged with the focus tube (103).

6. A helical telescope focusing mechanism according to claim 3, wherein Further comprising a protective cover (113), the rear collar (101) is fixedly connected with a protective cover (113) for protecting internal parts.

7. A helical telescope focusing mechanism according to claim 2, wherein The manual focusing hand wheel (205) can be used alone to realize manual focusing.

8. A helical telescope focusing mechanism according to claim 7, wherein the focusing mechanism is adapted to be used with a telescope having a focal length of 1000 mm or less. In the case that the stepping motor (204) is powered on, electric focusing is realized, and in the case that the stepping motor (204) is powered off, manual focusing is realized through the manual focusing hand wheel (205).

Images