Focusing structure

Abstract

The utility model provides a focusing structure, which comprises an outer lens barrel, and further comprises a knob, a focusing lens and a focusing lens, the small bevel gear is fixedly connected with the knob; the large bevel gear is meshed with the small bevel gear; the thread focusing cylinder is fixedly connected with the bevel gear wheel; the inner lens barrel is in threaded connection with the threaded focusing barrel; wherein the inner lens cone is slidably connected with the outer lens cone, and the sliding direction of the inner lens cone is the optical axis direction of the outer lens cone. According to the utility model, the focusing structure is compact.

Description

Technical Field

[0001] The utility model relates to the technical field of camera focusing, in particular to a focusing structure. Background Art

[0002] Infrared cameras are cameras that can monitor 24 hours a day. There are ordinary infrared cameras and dot matrix infrared cameras. Dot matrix infrared cameras are better than ordinary ones. They have a long irradiation distance, fine and clear image quality, and a longer service life than ordinary infrared cameras. Infrared cameras are sensitive to infrared rays within a certain wavelength range, such as 800nm-1100nm. In terms of the spectrum, it is similar to the principle of ordinary cameras sensing visible light. The working principle of infrared cameras is that infrared lamps emit infrared rays to illuminate objects, and the infrared rays are diffusely reflected and received by surveillance cameras to form video images.

[0003] The focus adjustment structure of the existing infrared camera is mostly driven by a knob to drive a small gear to rotate, and the small gear drives a large gear to rotate, and the large gear drives a focus tube, so that the focus tube moves along the optical axis of the objective lens group under the guidance of the focus seat, and then drives the camera board fixedly connected to the focus tube to move along the optical axis of the objective lens group to adjust the focal length. However, when this focusing structure realizes the forward and backward movement of the camera board along the optical axis, the focus seat needs to be involved, which increases the number of parts and occupies a large space, resulting in a non-compact structure of the infrared camera.

[0004] Therefore, it is necessary to develop a new focusing structure to make the focusing structure compact. Utility Model Content

[0005] The utility model aims to provide a focusing structure to solve the problem that the existing focusing structure is not compact.

[0006] In order to solve the above technical problems, the utility model provides a focusing structure, including an outer lens barrel, and also including: a knob rotatably mounted on the outer lens barrel; a small bevel gear fixedly connected to the knob; a large bevel gear meshing with the small bevel gear; a threaded focusing barrel fixedly connected to the large bevel gear; and an inner lens barrel threadedly connected to the threaded focusing barrel; wherein the sliding direction of the inner lens barrel is the optical axis direction of the outer lens barrel.

[0007] Optionally, a limiting groove is provided on the outer lens barrel, and a guide pin is fixed on the inner lens barrel, and the guide pin is slidably engaged with the limiting groove.

[0008] Optionally, the limiting groove is a through groove arranged on the outer lens barrel.

[0009] Optionally, the limiting groove is a waist-shaped groove.

[0010] Optionally, the guide pin is detachably threadedly connected to the inner barrel.

[0011] Optionally, it also includes a knob support seat, which is arranged on the outer circumferential surface of the outer lens barrel, the knob is rotatably connected to the knob support seat, and the number of the knob support seat, the knob and the small bevel gear are respectively two.

[0012] Optionally, one knob support seat, one knob and one small bevel gear form a group, and two groups of the knob support seat, the knob and the small bevel gear are respectively arranged on opposite sides of the outer lens barrel.

[0013] Optionally, it also includes a gear pressure ring for limiting the movement of the large bevel gear along the optical axis direction of the outer lens barrel.

[0014] Optionally, the rotation axis of the knob is perpendicular to the optical axis of the outer lens barrel.

[0015] Optionally, the knob is fixedly connected to the small bevel gear via a second fastener.

[0016] The focusing structure provided by the utility model has the following beneficial effects:

[0017] Since the knob rotatably mounted on the outer barrel, the small bevel gear fixedly connected to the knob, the large bevel gear meshing with the small bevel gear, the threaded focusing barrel fixedly connected to the large bevel gear, and the inner barrel threadedly connected to the threaded focusing barrel, the optical axes of the outer barrel and the inner barrel are coaxial, therefore, rotating the knob can drive the small bevel gear to rotate, thereby driving the large bevel gear to rotate, and then driving the threaded focusing barrel to rotate, so as to drive the inner barrel threadedly connected to the threaded focusing barrel to move; since the inner barrel is slidably connected to the outer barrel, and the sliding direction of the inner barrel is the optical axis direction of the outer barrel, therefore, the movement of the inner barrel is the movement along the optical axis direction of the outer barrel, that is, the inner barrel can be driven to move along the optical axis direction of the outer barrel by adjusting the knob, compared with the prior art, there is no need for the participation of a focusing seat, thereby saving parts and reducing the space occupied by the focusing structure, thus making the focusing structure compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a focusing structure in an embodiment of the utility model;

[0019] Figure 2 is a cross-sectional view of a knob in an embodiment of the utility model;

[0020] Figure 3 It is a partial structural schematic diagram of the focusing structure in the embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 100-outer lens barrel; 110-limiting groove; 200-knob support seat; 300-knob; 400-small bevel gear; 500-large bevel gear; 600-threaded focusing barrel; 700-inner lens barrel; 710-guide pin; 800-gear pressure ring; 900-housing; 910-first fastener; 920-second fastener; 930-third fastener. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings 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. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a cross-sectional view of the focusing structure in the embodiment of the utility model, Figure 2 is a cross-sectional view of a knob 300 in an embodiment of the utility model, Figure 3 It is a schematic diagram of the partial structure of the focusing structure in the embodiment of the utility model. The embodiment provides a focusing structure, including an outer lens barrel 100; a knob 300 rotatably mounted on the outer lens barrel 100; a small bevel gear 400 fixedly connected to the knob 300; a large bevel gear 500 meshing with the small bevel gear 400; a threaded focusing barrel 600 fixedly connected to the large bevel gear 500; and an inner lens barrel 700 threadedly connected to the threaded focusing barrel 600; wherein the inner lens barrel 700 is slidably connected to the outer lens barrel 100, and the inner lens barrel 700 slides relative to the outer lens barrel 100 along the optical axis direction of the outer lens barrel 100.

[0030] Since the knob 300 rotatably mounted on the outer lens barrel 100, the small bevel gear 400 fixedly connected to the knob 300, the large bevel gear 500 meshing with the small bevel gear 400, the threaded focusing barrel 600 fixedly connected to the large bevel gear 500, and the inner lens barrel 700 threadedly connected to the threaded focusing barrel 600, the optical axes of the outer lens barrel 100 and the inner lens barrel 700 are coaxial, therefore, rotating the knob 300 can drive the small bevel gear 400 to rotate, thereby driving the large bevel gear 500 to rotate, and then driving the threaded focusing barrel 600 to rotate, so as to drive the inner lens barrel 700 to rotate. The inner lens barrel 700 threadedly connected to the threaded focusing barrel 600 moves; since the inner lens barrel 700 is slidably connected to the outer lens barrel 100, and the sliding direction of the inner lens barrel 700 is the optical axis direction of the outer lens barrel 100, the movement of the inner lens barrel 700 is the movement along the optical axis direction of the outer lens barrel 100, that is, the inner lens barrel 700 can be driven to move along the optical axis direction of the outer lens barrel 100 by adjusting the knob 300. Compared with the prior art, the focusing process does not require the participation of the focusing seat, thereby saving parts and reducing the space occupied by the focusing structure, thereby making the structure of the focusing structure compact.

[0031] The outer lens barrel 100 is provided with a limiting groove 110, and the inner lens barrel 700 is fixed with a guide pin 710, and the guide pin 710 and the limiting groove 110 are slidably matched. Since the inner lens barrel 700 can move relative to the outer lens barrel 100 along the optical axis direction of the outer lens barrel 100 only by the guide pin 710 and the limiting groove 110, and the guide pin 710 and the limiting groove 110 occupy a small space, the focusing structure is compact.

[0032] Specifically, the limiting groove 110 is a through groove provided on the outer lens barrel 100 .

[0033] The limiting groove 110 is a waist-shaped groove.

[0034] The rotation axis of the knob 300 is perpendicular to the optical axis of the outer lens barrel 100 .

[0035] The guide pin 710 is detachably threadedly connected to the inner lens barrel 700 .

[0036] The focusing structure further includes a gear pressing ring 800 for limiting the large bevel gear 500 from moving along the optical axis direction of the outer lens barrel 100 .

[0037] Specifically, the gear pressing ring 800 is threadedly connected to the outer lens barrel 100 .

[0038] The large bevel gear 500 is fixedly connected to the threaded focusing cylinder 600 via a first fastener 910 .

[0039] The knob 300 is fixedly connected to the small bevel gear 400 via a second fastener 920 .

[0040] The focusing structure further includes a housing 900 , and the housing 900 is fixedly connected to the outer lens barrel 100 via a third fastener 930 . The housing 900 is located between the knob support seat 200 and the outer lens barrel 100 .

[0041] Preferably, it also includes a knob support seat, which is arranged on the outer circumferential surface of the outer barrel, and the knob 300 is rotatably connected to the knob support seat, and the number of the knob support seat 200, the knob 300 and the small bevel gear 400 are two respectively.

[0042] Furthermore, a knob support seat 200, a knob 300 and a small bevel gear 400 form a group, and two groups of the knob support seat 200, the knob 300 and the small bevel gear 400 are respectively arranged on opposite sides of the outer lens barrel 100. In this way, when in a special environment (the space on one side is limited or the user is left-handed), it will bring certain limitations to the focusing function, and the focusing of the double-sided knob 300 can solve this problem, making the application scenarios of the infrared camera wider.

[0043] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A focusing structure, comprising an outer lens barrel, characterized in that: Also includes: A knob rotatably mounted on the outer lens barrel; A small bevel gear fixedly connected to the knob; A large bevel gear meshing with the small bevel gear; A threaded focusing barrel fixedly connected to the large bevel gear; and An inner lens barrel threadably connected to the threaded focusing barrel; Wherein, the inner lens barrel is slidably connected to the outer lens barrel, and the sliding direction of the inner lens barrel is the optical axis direction of the outer lens barrel.

2. The focusing structure according to claim 1, characterized in that: The outer lens barrel is provided with a limiting groove, and the inner lens barrel is fixed with a guide pin, which is slidably matched with the limiting groove.

3. The focusing structure according to claim 2, characterized in that: The limiting groove is a through groove arranged on the outer lens barrel.

4. The focusing structure according to claim 2, characterized in that: The limiting groove is a waist-shaped groove.

5. The focusing structure according to claim 2, characterized in that: The guide pin is detachably threadedly connected to the inner lens barrel.

6. The focusing structure according to claim 1, characterized in that: It also includes a knob support seat, which is arranged on the outer circumferential surface of the outer lens barrel. The knob is rotatably connected to the knob support seat. The number of the knob support seat, the knob and the small bevel gear are respectively two.

7. The focusing structure according to claim 6, characterized in that: One knob support seat, one knob and one small bevel gear form a group, and two groups of knob support seats, knobs and small bevel gears are respectively arranged on opposite sides of the outer lens barrel.

8. The focusing structure according to claim 1, characterized in that: It also includes a gear pressing ring for limiting the movement of the large bevel gear along the optical axis direction of the outer lens barrel.

9. The focusing structure according to claim 1, characterized in that: The rotation axis of the knob is perpendicular to the optical axis of the outer lens barrel.

10. The focusing structure according to claim 1, characterized in that: The knob is fixedly connected to the small bevel gear via a second fastener.

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