Double-knob thread focusing mechanism

Abstract

The utility model belongs to the technical field of focusing lenses, and particularly relates to a double-knob thread focusing mechanism. Comprising a main lens cone and a shell, the main lens cone is fixedly installed on the inner side of 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; according to the utility model, through the gear combination design, multi-direction multi-knob focusing can be realized, and the gear combination has a high transmission ratio, so that the focusing precision is improved; according to the utility model, focusing is realized by moving the lens cone through the focusing mechanism; through the structural design of the mounting circular groove, the knob is convenient to replace.

Description

Technical Field

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

[0002] The focusing mechanism 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 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 CN202121904929.9 provides a focusing ring and a focusing lens for a focusing lens, wherein the focusing lens comprises an outer cylinder, an inner cylinder that can be telescopically moved relative to the outer cylinder, and a transmission member, wherein the outer cylinder is provided with an axially extending limiting hole and a circumferentially surrounding limiting groove, one end of the transmission member is connected to the inner cylinder, and the other end passes through the limiting hole; the focusing ring comprises a ring body, the outer ring surface of the ring body is provided with circumferentially surrounding meshing teeth, the inner ring surface is provided with a strip groove that slides with one end of the transmission member extending out of the limiting hole and a limiting structure that slides with the limiting groove, and one end of the strip groove gradually approaches the same end face of the ring body to the other end. This patent improves the versatility of the focusing ring and increases the flexibility of focusing lens assembly.

[0004] Conventional focusing structures can only achieve single-side knob focusing or barrel rotation focusing, and cannot achieve high transmission ratio and high focusing accuracy; 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 threaded focusing mechanism. The utility model can achieve a high transmission ratio through the knobs on both sides, thereby improving the focusing accuracy; the utility model realizes focusing by moving the lens barrel back and forth, and the focusing accuracy is high; the utility model facilitates the replacement of the knobs through the structural design of installing circular grooves.

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

[0007] A double-knob threaded focusing mechanism comprises a main lens barrel and a shell, wherein the main lens barrel is fixedly mounted on the inner side of the shell, and a movable lens barrel is slidably connected inside the main lens barrel;

[0008] The two sides of the shell are symmetrically rotatably connected with small gear shafts, one end of the small gear shaft is located outside the shell and is fixedly mounted with a knob, the other end of the small gear shaft is meshed with a large gear, the large gear keyway is connected with a focus ring, the focus ring is rotatably connected to the inside of the shell, and the inner ring of the focus ring is threadedly connected to the movable lens barrel.

[0009] Furthermore, one end of the focus ring abuts against the main lens barrel, and the other end of the focus ring abuts against a focus ring pressure ring, and the focus ring pressure ring is fixedly connected to the main lens barrel.

[0010] 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.

[0011] 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.

[0012] Furthermore, mounting holes are symmetrically provided on both sides of the shell, a mounting circular groove is fixedly connected to the mounting hole, a rotating hole is provided in the middle of the mounting circular groove, the pinion shaft is rotatably connected to the rotating hole of the mounting circular groove; the mounting circular groove is movably plugged into the knob body.

[0013] Furthermore, a sealing ring is movably mounted on the outer side wall of the mounting circular groove.

[0014] Furthermore, a baffle is installed on the outer end of the knob body.

[0015] Furthermore, limiting grooves are symmetrically provided on both sides of the main lens barrel, and limiting pins are symmetrically fixedly connected to both sides of the movable lens barrel, and the limiting pins are slidably connected to the corresponding limiting grooves.

[0016] The side surface of the movable lens barrel is symmetrically provided with threaded holes, and the limiting pin is threadedly connected to the side surface of the movable lens barrel.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) The utility model uses knobs on both sides, through the cooperation of the pinion shaft and the large gear, to enable the movable lens barrel to slide back and forth in the limit groove of the main lens barrel, 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.

[0019] (2) The utility model uses a focus ring and a movable lens barrel to be threadedly connected, and a focus ring pressure ring is used to limit the focus ring so that it can only rotate, so that the large gear rotates to drive the focus ring to rotate. The threaded connection cooperates with the limit pin to enable the movable lens barrel to move forward and backward, thereby achieving focusing with high focusing accuracy.

[0020] (3) The utility model adopts the structural design of installing the circular groove to make the knob installation more stable and easy to rotate, and the knob is detachably connected by fixing the screw connection to facilitate the replacement of the knob. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a double-knob thread focusing mechanism of the utility model;

[0022] Figure 2 The utility model is a partial structural schematic diagram of a double-knob thread focusing mechanism.

[0023] The reference numerals are as follows: main lens barrel-1; movable lens barrel-2; pinion shaft-3; knob-4; knob body-41; fixing screw-42; mounting circular groove-43; rotating hole-44; large gear-5; focusing ring-6; focusing ring pressure ring-7; limit pin-8; housing-9; image plane-10. DETAILED DESCRIPTION

[0024] 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.

[0025] Example

[0026] like Figure 1-2 As shown, a double-knob threaded focusing mechanism comprises a main lens barrel 1 and a housing 9, wherein the main lens barrel 1 is fixedly mounted on the inner side of the housing 9, and a movable lens barrel 2 is slidably connected inside the main lens barrel 1;

[0027] The two sides of the shell 9 are symmetrically rotatably connected with small gear shafts 3, and a knob 4 is fixedly installed on one end of the small gear shaft 3 located outside the shell 9. The other end of the small gear shaft 3 is meshed with a large gear 5, and the large gear 5 is keyway-connected with a focus ring 6. The focus ring 6 is rotatably connected to the inside of the shell 9, and the inner ring of the focus ring 6 is threadedly connected to the movable lens barrel 2.

[0028] The pinion shaft 3 is rotated by the knob 4 on either side, and the pinion shaft 3 drives the large gear 5 to rotate around the axis.

[0029] The large gear 5 and the focusing ring 6 rotate simultaneously, and can cooperate with the keyway of the focusing ring 6. The focusing ring 6 and the movable lens barrel 2 are threadedly matched to realize forward and backward movement within a limited range, thereby changing the focal length and realizing focusing.

[0030] The utility model uses the knobs 4 on both sides, and the cooperation of the pinion shaft 3 and the large gear 5, so that the movable lens barrel 2 can be slid back and forth in the limit groove of the main lens barrel 1 and be slidably connected, 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 5, a high transmission ratio can be achieved, thereby improving the focusing accuracy.

[0031] Furthermore, one end of the focus ring 6 abuts against the main lens barrel 1 , and the other end of the focus ring 6 abuts against a focus ring pressing ring 7 , and the focus ring pressing ring 7 is fixedly connected to the main lens barrel 1 .

[0032] The focus ring 6 is limited in front and back directions by the main lens barrel 1 and the focus ring pressure ring 7, and can only rotate but cannot move forward and backward.

[0033] 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 .

[0034] 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 .

[0035] 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; the mounting circular groove 43 is movably plugged into the knob body 41.

[0036] Furthermore, a sealing ring is movably mounted on the outer side wall of the mounting circular groove 43 .

[0037] Furthermore, a baffle is installed at the outer end of the knob body 41, and an image plane 10 is installed inside the housing 9. The baffle is convenient for protecting the fixing screw 42.

[0038] The utility model makes the installation of the knob 4 more stable and easy to rotate by installing the circular groove 43 , and makes the knob 4 detachable by fixing the screw 42 , so that the replacement of the knob 4 is convenient.

[0039] Furthermore, the two sides of the main lens barrel 1 are symmetrically provided with limit grooves, and the two sides of the mobile lens barrel 2 are symmetrically fixedly connected with limit pins 8, and the limit pins 8 are slidably connected with the corresponding limit grooves. The mobile lens barrel 2 is limited and cannot rotate around the axis, but can only move forward and backward.

[0040] The utility model uses a focus ring 6 and a movable lens barrel 2 in a threaded connection mode, and at the same time uses a focus ring pressure ring 7 to limit the focus ring 6 so that it can only rotate, so that the large gear 5 rotates to drive the focus ring 6 to rotate, and the threaded connection mode cooperates with the limit pin 8 to enable the movable lens barrel 2 to move forward and backward, thereby realizing focusing, and the focusing accuracy is high.

[0041] Furthermore, threaded holes are symmetrically provided on the side surface of the movable lens barrel 2 , and the limit pin 8 is threadedly connected to the side surface of the movable lens barrel 2 , so that the limit pin 8 is easy to install and remove.

[0042] 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.

[0043] 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 thread 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 the inner side of the housing (9), and a movable lens barrel (2) is slidably connected inside the main lens barrel (1); The two sides of the housing (9) are symmetrically rotatably connected with small gear shafts (3), one end of the small gear shaft (3) located outside the housing (9) is fixedly mounted with a knob (4), the other end of the small gear shaft (3) is meshed with a large gear (5), the large gear (5) is keyway-connected with a focus ring (6), the focus ring (6) is rotatably connected to the inside of the housing (9), and the inner ring of the focus ring (6) is threadedly connected to the movable lens barrel (2).

2. A double-knob thread focusing mechanism according to claim 1, characterized in that: One end of the focus ring (6) abuts against the main lens barrel (1), and the other end of the focus ring (6) abuts against a focus ring pressing ring (7), and the focus ring pressing ring (7) is fixedly connected to the main lens barrel (1).

3. The double-knob thread 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).

4. The double-knob thread 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).

5. A double-knob thread focusing mechanism according to claim 4, 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), the pinion shaft (3) is rotatably connected to the rotating hole (44) of the mounting circular groove (43); and the mounting circular groove (43) is movably plugged into the knob body (41).

6. A double-knob thread focusing mechanism according to claim 5, characterized in that: A sealing ring is movably mounted on the outer side wall of the mounting circular groove (43).

7. A double-knob thread focusing mechanism according to claim 6, characterized in that: A baffle is installed at the outer end of the knob body (41).

8. The double-knob thread focusing mechanism according to claim 1, characterized in that: The main lens barrel (1) has limit slots symmetrically formed on both sides, and the movable lens barrel (2) has limit pins (8) symmetrically fixedly connected to both sides, and the limit pins (8) are slidably connected to the corresponding limit slots.

9. A double-knob thread focusing mechanism according to claim 8, characterized in that: The side surface of the movable lens barrel (2) is symmetrically provided with threaded holes, and the limiting pin (8) is connected to the thread of the movable lens barrel (2).

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