Automatic zooming device for security camera

Abstract

The utility model relates to an automatic zoom device for a security camera, which comprises a front fixing assembly, a zoom assembly, a compensation assembly and a rear fixing assembly which are sequentially arranged from front to back, two guide rods and two rotating shafts are arranged between the front fixing assembly and the rear fixing assembly, and the two guide rods and the two rotating shafts are alternately arranged according to a rectangular array. The zooming assembly and the compensation assembly are installed on the two guide rods at the same time, two micro servo motors are installed behind the rear fixing assembly, motor shafts of the two micro servo motors are connected with two rotating shafts through couplings respectively, and the two rotating shafts are each provided with an external thread cylinder. And the two external threaded cylinders are respectively in threaded connection with a first internal threaded hole in the zoom assembly and a second internal threaded hole in the compensation assembly. The beneficial effects are that the zoom assembly and the compensation assembly can be moved independently according to actual needs, and a stable supporting structure can be formed for the zoom assembly and the compensation assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of cameras, in particular to an automatic zoom device for a security camera. Background Art

[0002] In order to capture clear video footage from a distance, security cameras installed at heights generally use automatic zoom devices to adjust the focal length of the security cameras. Mechanical compensation zoom is currently the most widely used optical zoom method. For example, the utility model patent with application number 202222311076.9 discloses a high-precision guide mechanism for automatic zoom lenses. The sliding of the guide rod and the guide sleeve adopts a precise fit of line contact, which provides a guarantee for precise guidance. The zoom motor drives the zoom screw shaft to move, thereby driving the zoom component and the compensation component to move along the set trajectory on the guide pair through the front and rear connecting pins. The zoom component and the compensation component must be linked according to the manufactured zoom screw shaft parameters and cannot be moved separately according to actual needs. In addition, the zoom component and the compensation component are only supported by two guide rods located at the bottom of the component, and have poor stability. Utility Model Content

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide an automatic zoom device for a security camera.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A security camera automatic zoom device includes a front fixing component, a magnification component, a compensation component and a rear fixing component arranged in sequence from front to back, two guide rods and two rotatable shafts are installed between the front fixing component and the rear fixing component, and the two guide rods and the two rotating shafts are arranged alternately in a rectangular array, the magnification component and the compensation component are simultaneously installed on the two guide rods, two micro servo motors are installed behind the rear fixing component, the motor shafts of the two micro servo motors are respectively connected to the two rotating shafts through couplings, and an externally threaded barrel is installed on each of the two rotating shafts, and the two externally threaded barrels are respectively screwed to the first internally threaded hole on the magnification component and the second internally threaded hole on the compensation component.

[0006] The front fixing assembly, the zoom assembly, the compensation assembly and the rear fixing assembly are located on the same optical axis, and the guide rod and the rotating shaft are parallel to the optical axis of the front fixing assembly.

[0007] Wherein, the connection line between the two guide rods and the connection line between the two rotating shafts intersect on the optical axis of the front fixing component.

[0008] Among them, the two externally threaded barrels are respectively the first externally threaded barrel and the second externally threaded barrel, the first externally threaded barrel is screwed to the first internally threaded hole on the zoom component, and the second externally threaded barrel is screwed to the second internally threaded hole on the compensation component, the zoom component is provided with a first through hole for the second externally threaded barrel to pass through, and the compensation component is provided with a second through hole for the first externally threaded barrel to pass through.

[0009] Wherein, the zoom component is provided with a first guide sleeve which is sleeved on the guide rod, and the compensation component is provided with a second guide sleeve which is sleeved on the guide rod.

[0010] Wherein, miniature ball bearings are respectively installed between the two ends of the rotating shaft and the front fixed component and the rear fixed component.

[0011] A first positioning plane is provided on the side wall of the rotating shaft, and a second positioning plane is provided on the inner side of the externally threaded barrel. When the externally threaded barrel is sleeved on the rotating shaft, the first positioning plane and the second positioning plane fit tightly together.

[0012] Wherein, the external threaded barrel and the rotating shaft are fixed with set screws.

[0013] The beneficial effects of the present utility model are as follows: two micro servo motors are used to drive the two rotating shafts to rotate respectively, thereby driving the magnification component and the compensation component to move respectively through two external threaded cylinders, and the magnification component and the compensation component can be moved separately according to actual needs; the magnification component and the compensation component are both supported by two guide rods and a rotating shaft, and the two guide rods and any one of the rotating shafts are respectively located at the three vertices of a triangle, which can form a stable support structure for the magnification component and the compensation component. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of the automatic zoom device for security cameras in the utility model;

[0016] Figure 2 This is a schematic structural diagram of the zoom component in the utility model;

[0017] Figure 3 It is a structural diagram of the compensation component in the utility model;

[0018] Figure 4 This is a schematic structural diagram of the first externally threaded barrel in the present utility model;

[0019] Explanation of the numbers in the figure: front fixing component 1, magnification component 2, first internal threaded hole 201, first through hole 202, first guide sleeve 203, compensation component 3, second internal threaded hole 301, second through hole 302, second guide sleeve 303, rear fixing component 4, guide rod 5, rotating shaft 6, first positioning plane 601, micro servo motor 7, coupling 8, external threaded barrel 9, first external threaded barrel 901, second external threaded barrel 902, second positioning plane 903, micro ball bearing 10, and set screw 11. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0021] like Figures 1 to 4 As shown, an automatic zoom device for a security camera includes a front fixing component 1, a magnification component 2, a compensation component 3 and a rear fixing component 4 arranged in sequence from front to back, and the front fixing component 1, the magnification component 2, the compensation component 3 and the rear fixing component 4 are located on the same optical axis.

[0022] Two guide rods 5 and two rotatable shafts 6 are installed between the front fixed assembly 1 and the rear fixed assembly 4, and the two guide rods 5 and the two rotating shafts 6 are arranged alternately in a rectangular array, that is, the two guide rods 5 and the two rotating shafts 6 are arranged alternately, and the guide rods 5 and the rotating shafts 6 are parallel to the optical axis of the front fixed assembly 1, and the line connecting the two guide rods 5 and the line connecting the two rotating shafts 6 intersect on the optical axis of the front fixed assembly 1.

[0023] The zoom component 2 and the compensation component 3 are simultaneously installed on two guide rods 5. Preferably, the zoom component 2 is installed with a first guide sleeve 203 which is sleeved on the guide rod 5, and the first guide sleeve 203 helps the zoom component 2 to move smoothly along the guide rod 5; the compensation component 3 is installed with a second guide sleeve 303 which is sleeved on the guide rod 5, and the second guide sleeve 303 helps the compensation component 3 to move smoothly along the guide rod 5.

[0024] Miniature ball bearings 10 are respectively installed between the two ends of the rotating shaft 6 and the front fixing component 1 and the rear fixing component 4. The miniature ball bearings 10 help the rotating shaft 6 to rotate smoothly.

[0025] Two micro servo motors 7 are installed at the rear of the rear fixing assembly 4. The motor shafts of the two micro servo motors 7 are connected to the two rotating shafts 6 through couplings 8 respectively. An external threaded barrel 9 is installed on each of the two rotating shafts 6. In order to prevent circumferential movement between the external threaded barrel 9 and the rotating shaft, a first positioning plane 601 is provided on the side wall of the rotating shaft 6, and a second positioning plane 903 is provided on the inner side of the external threaded barrel 9. When the external threaded barrel 9 is sleeved on the rotating shaft 6, the first positioning plane 601 and the second positioning plane 903 are tightly fitted; in order to prevent axial movement between the external threaded barrel 9 and the rotating shaft, the external threaded barrel 9 and the rotating shaft 6 are fixed with a set screw 11.

[0026] The two externally threaded barrels 9 are respectively screwed with the first internally threaded hole 201 on the zoom component 2 and the second internally threaded hole 301 on the compensation component 3. Specifically, the two externally threaded barrels 9 are respectively the first externally threaded barrel 901 and the second externally threaded barrel 902. The first externally threaded barrel 901 is screwed with the first internally threaded hole 201 on the zoom component 2, and the second externally threaded barrel 902 is screwed with the second internally threaded hole 301 on the compensation component 3. The zoom component 2 is provided with a first through hole 202 for the second externally threaded barrel 902 to pass through, and the compensation component 3 is provided with a second through hole 302 for the first externally threaded barrel 901 to pass through.

[0027] Design principle: Two micro servo motors are used to drive the two rotating shafts to rotate respectively, thereby driving the magnification component and the compensation component to move respectively through two external threaded cylinders. The magnification component and the compensation component can be moved separately according to actual needs; the magnification component and the compensation component are both supported by two guide rods and a rotating shaft, and the two guide rods and any one of the rotating shafts are respectively located at the three vertices of the triangle, which can form a stable support structure for the magnification component and the compensation component.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. An automatic zoom device for a security camera, comprising a front fixing assembly, a zoom assembly, a compensation assembly, and a rear fixing assembly arranged in sequence from front to back, characterized in that: Two guide rods and two rotatable shafts are installed between the front fixed assembly and the rear fixed assembly, and the two guide rods and the two rotating shafts are arranged alternately in a rectangular array. The magnification component and the compensation component are simultaneously installed on the two guide rods. Two micro servo motors are installed behind the rear fixed assembly. The motor shafts of the two micro servo motors are respectively connected to the two rotating shafts through couplings. An externally threaded barrel is installed on each of the two rotating shafts, and the two externally threaded barrels are respectively screwed to the first internally threaded hole on the magnification component and the second internally threaded hole on the compensation component.

2. The automatic zoom device for a security camera according to claim 1, characterized in that: The front fixing assembly, the zoom assembly, the compensation assembly and the rear fixing assembly are located on the same optical axis, and the guide rod and the rotating shaft are parallel to the optical axis of the front fixing assembly.

3. The automatic zoom device for a security camera according to claim 2, characterized in that: The connecting line between the two guide rods and the connecting line between the two rotating shafts intersect on the optical axis of the front fixing component.

4. The automatic zoom device for a security camera according to claim 1, characterized in that: The two externally threaded barrels are respectively the first externally threaded barrel and the second externally threaded barrel. The first externally threaded barrel is screwed to the first internally threaded hole on the zoom component, and the second externally threaded barrel is screwed to the second internally threaded hole on the compensation component. The zoom component is provided with a first through hole for the second externally threaded barrel to pass through, and the compensation component is provided with a second through hole for the first externally threaded barrel to pass through.

5. The automatic zoom device for a security camera according to claim 1, characterized in that: The zoom component is provided with a first guide sleeve sleeved on the guide rod, and the compensation component is provided with a second guide sleeve sleeved on the guide rod.

6. The automatic zoom device for a security camera according to claim 1, characterized in that: Miniature ball bearings are respectively installed between the two ends of the rotating shaft and the front fixed component and the rear fixed component.

7. The automatic zoom device for a security camera according to claim 1, characterized in that: A first positioning plane is provided on the side wall of the rotating shaft, and a second positioning plane is provided on the inner side of the externally threaded barrel. When the externally threaded barrel is sleeved on the rotating shaft, the first positioning plane and the second positioning plane are tightly fitted.

8. The automatic zoom device for a security camera according to claim 1, characterized in that: The external threaded barrel and the rotating shaft are fixed with set screws.

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