Double-knob curve tube focusing mechanism

Abstract

The utility model belongs to the technical field of focusing lenses, and particularly relates to a double-knob curve tube focusing mechanism. Comprising a main lens cone and a shell, the main lens cone is fixedly installed at one end in the shell, a lens is installed at one end of the main lens cone, a movable lens cone is slidably connected into the other end of the main lens cone, and a lens is installed at the end, away from the main lens cone, of the movable lens cone; the two sides of the shell are symmetrically and rotationally connected with small gear shafts, the small gear shafts are located at the two ends of the outer portion of the shell and are fixedly provided with rotary knobs, the small gear shafts at the two ends are meshed with a large gear, the transmission structure comprises the rotary knobs, the small gear shafts, the large gear, a guide pin and a movable lens cone, and the large gear is provided with a curved groove. The two ends of the large gear are limited through the main lens cone and the pressing ring, and the guide pin penetrates through a curved groove in the large gear. According to the utility model, the large gear is driven to rotate around the main lens barrel through any symmetrically arranged knob, and the large gear drives the guide pin to move back and forth when rotating, so that the focal length is changed, meanwhile, high transmission ratio can be realized, and the focusing precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of focusing lenses, and in particular relates to a double-knob curve barrel focusing mechanism. Background Art

[0002] The focusing mechanism is a part in the sight and lens that has the function of adjusting the focal length. It is designed to provide greater flexibility and control to capture clear images in different scenarios. The common focusing method is to rotate a single knob or rotate the lens barrel to move the focusing assembly back and forth to achieve focusing. Single-select button focusing: using a curved barrel cam mechanism, the cam rotates, the rotation center position remains unchanged, the cam center distance is constantly changing, thereby driving the guide pin away from or close to the cam rotation center, the guide pin and the optical tail piece are connected by a rigid fit, and move at the same time, the position of the other optical lenses remains unchanged, and the optical focal length changes, thereby achieving focusing.

[0003] The Chinese patent application number CN201110449149.4 provides an automatic reciprocating cylindrical cam focusing mechanism involving a mechanical focusing technology of an optical lens, the mechanism includes: a guide column, a guide cylinder, a focusing lens assembly and a stepping motor, the mechanism also includes: a cylindrical cam assembly, the cylindrical cam assembly includes: a forward cam, a backward cam and a connecting cylinder; the forward cam and the backward cam are fixed in the connecting cylinder; the guide cylinder is located in the innermost layer of the focusing mechanism; the upper part of the guide end of the guide column is located in the closed cam groove of the cylindrical cam assembly, the lower part of the guide end of the guide column is located in the guide groove of the guide cylinder, and the threaded end of the guide column is fixed to the focusing lens assembly; the cylindrical cam assembly is located in the outer layer of the guide cylinder, and the forward cam moves in coordination with the stepping motor. The device can achieve smooth direction switching without a limit device, the focusing is stable and simple, and has a self-protection function for over-travel of focusing; the focusing resolution can be adjusted by controlling the subdivision multiple of the stepping motor, and high-precision continuous focusing can be achieved.

[0004] In general sights and other structures, the conventional focusing structure can only achieve single-side knob focusing or lens barrel rotation focusing, which cannot guarantee the accuracy of focal length adjustment; at the same time, the replacement of the knob is relatively complicated. Utility Model Content

[0005] In view of the above-mentioned shortcomings, the utility model provides a double-knob curved barrel focusing mechanism. The utility model realizes double-knob focusing by symmetrically arranged knobs and then changing the focal length through the curved groove structure design of the transmission shaft tube on the transmission structure. At the same time, a high transmission ratio can be achieved through the transmission of the small gear shaft and the large gear, thereby improving the focusing accuracy. The utility model realizes focusing with high focusing accuracy by means of a guide pin passing through the limit groove of the main lens barrel and the curved groove of the transmission shaft tube in sequence. The utility model improves the stability of the knob and is also easy to disassemble the knob.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A double-knob curved barrel focusing mechanism comprises a main barrel and a shell, wherein the main barrel is fixedly mounted on one end of the inner part of the shell, and a movable barrel is slidably connected to the inner part of the main barrel;

[0008] The two sides of the shell are symmetrically rotatably connected with pinion shafts, and a knob is fixedly installed on one end of the pinion shaft located outside the shell. One end of the pinion shaft is meshed with a transmission structure, and a curved groove is provided on the transmission structure; the two sides of the movable lens barrel are symmetrically fixedly connected with guide pins, and limiting grooves are correspondingly provided on both sides of the main lens barrel, and the guide pins pass through the limiting grooves and are slidably connected with the curved grooves.

[0009] Furthermore, the transmission structure includes a large gear and a transmission shaft tube, the large gear and the transmission shaft tube are one part, and the other end of the large gear is meshed with one end of the small gear shaft; the large gear is sleeved on the outside of the main lens barrel, and a curved groove is opened on the transmission shaft tube.

[0010] Furthermore, the limiting groove of the main lens barrel is in the shape of an elongated strip, so that the guide pin moves in the limiting groove.

[0011] Furthermore, a limiting ring is fixedly connected to the interior of the shell, and one end of the limiting ring abuts against the transmission shaft tube.

[0012] Furthermore, a lens is installed at one end of the main lens barrel, a movable lens barrel is slidably connected inside the other end of the main lens barrel, and a lens is installed at one end of the movable lens barrel away from the main lens barrel.

[0013] Furthermore, the knob includes a knob body and a fixing screw, a threaded hole is opened at one end of the pinion shaft, and the fixing screw passes through the middle part of the knob body and is threadedly connected to one end of the pinion shaft.

[0014] Furthermore, mounting holes are symmetrically provided on both sides of the housing, mounting circular grooves are fixedly connected to the mounting holes, a rotating hole is provided in the middle of the mounting circular groove, and the pinion shaft is rotatably connected to the rotating hole of the mounting circular groove.

[0015] Furthermore, a limiting shaft sleeve is provided at the bottom center of the knob body, and the limiting shaft sleeve is inserted into the installation circular groove and movably connected with the installation circular groove.

[0016] Furthermore, a baffle is installed at the outer end of the knob body, and an image plane is installed inside the shell.

[0017] Furthermore, two threaded holes are symmetrically provided on the side surface of the movable lens barrel, and the guide pin is threadedly connected to the side surface of the movable lens barrel.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1) The utility model uses symmetrically arranged knobs, and then through the meshing of the pinion shaft and the transmission structure, when any knob is rotated, it will drive the pinion shaft and the transmission structure to rotate. Then, through the curved groove structure design of the transmission shaft tube on the transmission structure, when the transmission structure rotates, the guide pin on the movable lens barrel slides along the curved groove, and under the limit of the limit groove of the main lens barrel, the movable lens barrel slides back and forth, thereby changing the focal length and realizing double-knob focusing. At the same time, through the transmission of the pinion shaft and the large gear, a high transmission ratio can be achieved, thereby improving the focusing accuracy.

[0020] (2) The utility model uses a guide pin to sequentially pass through the limit groove of the main lens barrel and the curved groove of the transmission shaft tube, so that when the transmission structure rotates, the movable lens barrel can slide back and forth to achieve focusing, and the focusing accuracy is high; under the action of the limit ring, the transmission structure is between the pinion shaft and the limit ring, so that the transmission structure can rotate without deviation.

[0021] (3) The utility model can limit the knob by movably connecting the circular groove with the limiting shaft sleeve at the bottom center of the knob body, thereby improving the stability of the knob and facilitating the disassembly of the knob. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a double-knob curved barrel focusing mechanism of the utility model;

[0023] Figure 2 It is a partial cross-sectional structural diagram of a double-knob curved barrel focusing mechanism of the utility model;

[0024] Figure 3 The utility model is a partial structural schematic diagram of a double-knob curved barrel focusing mechanism.

[0025] The figure numbers are as follows: main lens barrel-1; moving lens barrel-2; small gear shaft-3; knob-4; knob body-41; fixing screw-42; mounting circular groove-43; rotating hole-44; transmission structure-5; large gear-51; transmission shaft tube-52; curved groove-53; image plane-6; limit ring-7; guide pin-8; housing-9. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example

[0028] like Figure 1 to Figure 3 As shown, a dual-knob curved barrel focusing mechanism comprises a main barrel 1 and a housing 9, wherein the main barrel 1 is fixedly mounted at one end of the housing 9, and a movable barrel 2 is slidably connected to the interior of the main barrel 1;

[0029] The two sides of the shell 9 are symmetrically rotatably connected with the pinion shaft 3, and the pinion shaft 3 is fixedly installed with a knob 4 at one end outside the shell 9. One end of the pinion shaft 3 is meshed with a transmission structure 5, and the transmission structure 5 is provided with a curved groove 53; the two sides of the movable lens barrel 2 are symmetrically fixedly connected with guide pins 8, and the two sides of the main lens barrel 1 are correspondingly provided with limit grooves, and the guide pins 8 pass through the limit grooves and are slidably connected with the curved grooves 53.

[0030] Furthermore, the transmission structure 5 includes a large gear 51 and a transmission shaft tube 52, the large gear 51 and the transmission shaft tube 52 are one part, and the other end of the large gear 51 is meshed with one end of the pinion shaft 3; the large gear 51 is sleeved on the outer side of the main lens barrel 1, and a curved groove 53 is opened on the transmission shaft tube 52.

[0031] The pinion shaft 3 is rotated by the knob 4 on either side, and the pinion shaft 3 drives the transmission structure 5 to rotate around the axis.

[0032] The transmission structure 5 has a curved groove 53. The large gear 51 drives the movable lens barrel 2 to move forward and backward through the curved groove 53 during the rotation around the axis, thereby achieving focusing.

[0033] The utility model uses a symmetrically arranged knob 4, and then through the meshing of the pinion shaft 3 and the transmission structure 5, when any knob 4 is rotated, it will drive the pinion shaft 3 and the transmission structure 5 to rotate, and then through the structural design of the curved groove 53 of the transmission shaft tube 52 on the transmission structure 5, when the transmission structure 5 rotates, the guide pin 8 on the movable lens barrel 2 slides along the curved groove 53, and under the limitation of the limiting groove of the main lens barrel 1, the movable lens barrel 2 slides back and forth, thereby changing the focal length and realizing double-knob focusing. At the same time, through the transmission of the pinion shaft 3 and the large gear 51, a high transmission ratio can be achieved, thereby improving the focusing accuracy.

[0034] Furthermore, the limiting groove of the main lens barrel 1 is in the shape of an elongated strip, so that the guide pin 8 can move in the limiting groove.

[0035] Furthermore, a limiting ring 7 is fixedly connected to the interior of the housing 9 , and one end of the limiting ring 7 abuts against the transmission shaft tube 52 .

[0036] Furthermore, a lens is installed at one end of the main lens barrel 1 , and a movable lens barrel 2 is slidably connected inside the other end of the main lens barrel 1 , and a lens is installed at one end of the movable lens barrel 2 away from the main lens barrel 1 .

[0037] The utility model realizes focusing by allowing the movable lens barrel 2 to slide back and forth when the transmission structure 5 rotates, by means of a guide pin 8 passing through the limit groove of the main lens barrel 1 and the curved groove 53 of the transmission shaft tube 52 in sequence; and the focusing is achieved with high precision; under the action of the limit ring 7, the transmission structure 5 is located between the pinion shaft 3 and the limit ring 7, thereby realizing the rotation of the transmission structure 5 without deviation.

[0038] Furthermore, the knob 4 includes a knob body 41 and a fixing screw 42 . A threaded hole is formed at one end of the pinion shaft 3 . The fixing screw 42 passes through the middle of the knob body 41 and is threadedly connected to one end of the pinion shaft 3 .

[0039] Furthermore, mounting holes are symmetrically provided on both sides of the housing 9 , a mounting circular groove 43 is fixedly connected to the mounting hole, a rotating hole 44 is provided in the middle of the mounting circular groove 43 , and the pinion shaft 3 is rotatably connected to the rotating hole 44 of the mounting circular groove 43 .

[0040] Furthermore, a limiting sleeve is provided at the bottom center of the knob body 41 , and the limiting sleeve is inserted into the mounting circular groove 43 and movably connected to the mounting circular groove 43 .

[0041] The utility model can limit the knob 4 by movably connecting the circular groove 43 with the limiting shaft sleeve at the bottom center of the knob body 41, thereby improving the stability of the knob 4 and facilitating the disassembly of the knob 4.

[0042] Furthermore, a baffle is installed at the outer end of the knob body 41, and an image plane 6 is installed inside the housing 9. The baffle is convenient for protecting the fixing screw 42.

[0043] Furthermore, two threaded holes are symmetrically provided on the side of the movable lens barrel 2, and the guide pin 8 is threadedly connected to the side of the movable lens barrel 2. The threaded connection of the guide pin 8 facilitates the replacement of parts.

[0044] The above content is a further detailed description of the utility model in combination with specific implementation examples. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the protection scope of the utility model.

[0045] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-knob curved tube focusing mechanism, characterized in that: The invention comprises a main lens barrel (1) and a housing (9), wherein the main lens barrel (1) is fixedly mounted on one end of the interior of the housing (9), and a movable lens barrel (2) is slidably connected to the interior of the main lens barrel (1); The two sides of the housing (9) are symmetrically rotatably connected to a pinion shaft (3); a knob (4) is fixedly mounted on one end of the pinion shaft (3) located outside the housing (9); one end of the pinion shaft (3) is meshed with a transmission structure (5); a curved groove (53) is provided on the transmission structure (5); the two sides of the movable lens barrel (2) are symmetrically fixedly connected to a guide pin (8); two sides of the main lens barrel (1) are correspondingly provided with a limit groove; the guide pin (8) passes through the limit groove and is slidably connected to the curved groove (53).

2. A double-knob curved cylinder focusing mechanism according to claim 1, characterized in that: The transmission structure (5) comprises a large gear (51) and a transmission shaft tube (52), wherein the large gear (51) and the transmission shaft tube (52) are one part, and the other end of the large gear (51) is meshed with one end of a small gear shaft (3); the large gear (51) is sleeved on the outside of the main lens barrel (1), and the transmission shaft tube (52) is provided with a curved groove (53).

3. The double-knob curved cylinder focusing mechanism according to claim 1, characterized in that: The limiting groove of the main lens barrel (1) is in the shape of an elongated strip, so that the guide pin (8) can move in the limiting groove.

4. A double-knob curved cylinder focusing mechanism according to claim 2, characterized in that: A limiting ring (7) is fixedly connected to the interior of the outer shell (9), and one end of the limiting ring (7) is in contact with the transmission shaft tube (52).

5. The double-knob curved cylinder focusing mechanism according to claim 1, characterized in that: A lens is installed at one end of the main lens barrel (1), and a movable lens barrel (2) is slidably connected inside the other end of the main lens barrel (1), and a lens is installed at one end of the movable lens barrel (2) away from the main lens barrel (1).

6. The double-knob curved cylinder focusing mechanism according to claim 1, characterized in that: The knob (4) comprises a knob body (41) and a fixing screw (42); a threaded hole is provided at one end of the pinion shaft (3); the fixing screw (42) passes through the middle of the knob body (41) and is threadedly connected to one end of the pinion shaft (3).

7. A double-knob curved cylinder focusing mechanism according to claim 6, characterized in that: The housing (9) has mounting holes symmetrically formed on both sides, a mounting circular groove (43) is fixedly connected to the mounting hole, a rotating hole (44) is formed in the middle of the mounting circular groove (43), and the pinion shaft (3) is rotatably connected to the rotating hole (44) of the mounting circular groove (43).

8. The double-knob curved cylinder focusing mechanism according to claim 7, characterized in that: A limiting shaft sleeve is provided at the bottom center of the knob body (41), and the limiting shaft sleeve is inserted into the mounting circular groove (43) and movably connected to the mounting circular groove (43).

9. The double-knob curved cylinder focusing mechanism according to claim 7, characterized in that: A baffle is installed at the outer end of the knob body (41), and an image plane (6) is installed inside the housing (9).

10. The double-knob curved cylinder focusing mechanism according to claim 1, characterized in that: The side surface of the movable lens barrel (2) is symmetrically provided with two threaded holes, and the guide pin (8) is threadedly connected to the side surface of the movable lens barrel (2).

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