Zoom lens barrel structure of low-abrasion infrared objective lens

Abstract

The utility model provides a low-wear infrared objective zoom lens barrel structure, which relates to the technical field of optical devices and comprises a rear lens barrel, a front ball frame, a focusing barrel, a rear ball frame, balls and a rear fixing seat. And the focusing cylinder is installed on balls of the front ball frame and the rear ball frame, so that the inner wall of the focusing cylinder and the outer wall of the rear lens cone are arranged at an interval, and the rear fixing seat is installed on the outer circle of the rear lens cone at the rear end of the rear ball frame in a limiting manner. The surface contact resistance is large, the service life of the motor is shortened, the structural processing difficulty is large, and the required precision of a matching surface is high.

Description

Technical Field

[0001] The utility model relates to the technical field of optical devices, in particular to a low-wear infrared objective lens zoom barrel structure. Background Art

[0002] The infrared objective lens can continuously change the focal length of the system within a certain range. While changing the field of view, the image plane is stable and clear, and the problem of target loss will not occur. Therefore, you can first search for the target through a large field of view, and then switch to a small field of view to accurately observe the target.

[0003] The traditional method of changing the focal length of a system involves rigidly fitting the inner and outer cam barrels together, with the focus switched by rotating the outer cam barrel. This traditional method of rigidly fitting the inner and outer cam barrels for zooming has the following problems: the mating surfaces are in surface contact, resulting in large contact areas. Long-term use can lead to oxide layer shedding and aluminum shavings accumulation, causing product stalling; the surface contact resistance is high, reducing the life of the motor; the structure is difficult to manufacture, and the mating surfaces require high precision. Therefore, this application proposes a low-wear infrared objective lens zoom barrel structure. Utility Model Content

[0004] In order to overcome the problems in the background technology, the utility model provides a low-wear infrared objective lens zoom barrel structure to solve the problems of the hard fit of the inner and outer cam barrels of the traditional barrel structure, which will cause the oxide layer to fall off and aluminum chips to accumulate after long-term use, resulting in product stalling, and large surface contact resistance, which will reduce the life of the motor, and the difficulty of structural processing and the high precision requirement of the mating surface.

[0005] A low-wear infrared objective lens zoom barrel structure is characterized by comprising a rear lens barrel, a front ball rack, a focusing barrel, a rear ball rack, balls and a rear fixed seat, wherein the front ball rack and the rear ball rack are fittedly mounted on the outer circumference of the rear lens barrel, the focusing barrel is mounted on the balls of the front ball rack and the rear ball rack so that the inner wall of the focusing barrel is spaced apart from the outer wall of the rear lens barrel, and the rear fixed seat is limit-mounted on the outer circumference of the rear lens barrel at the rear end of the rear ball rack.

[0006] Furthermore, the front ball rack and the rear ball rack have the same structure and are arranged opposite to each other on the rear lens barrel. The bottoms of the front ball rack and the rear ball rack are provided with limit blocks that fit with the limit grooves on the rear lens barrel and the rear fixing seat.

[0007] Furthermore, the inner walls at both ends of the focusing tube are provided with inwardly inclined surfaces connected to the balls, and dust shields are provided at both ends of the focusing tube.

[0008] Furthermore, the rear fixing seat is threadedly mounted on the rear lens barrel, a fastening screw hole is penetrated through the side wall of the rear fixing seat, and a tightening bolt is installed in the fastening screw hole.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The focusing tube of the present application is installed through the front ball rack and the rear ball rack, and the contact form is changed from traditional surface contact to line contact, which reduces friction during the use of the product and reduces the overall processing accuracy of the structural parts. It solves the problem that the long-term use of the hard fit of the inner and outer cam tubes of the traditional lens barrel structure will cause the oxide layer to fall off, aluminum chips to accumulate, causing the product to stall, and the surface contact resistance is large, which will reduce the life of the motor, and the structural processing is difficult, and the mating surface requires high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for describing the embodiments are described below.

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0015] Figure 4 This is a schematic structural diagram of the front ball carrier of the present invention.

[0016] 1-rear lens barrel, 2-front ball bearing rack, 21-limit block, 3-focusing barrel, 31-dust shield, 4-rear ball bearing rack, 5-ball, 6-rear fixing seat, 7-tightening bolt. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding by technicians.

[0018] The utility model proposes a low-wear infrared objective lens zoom lens barrel structure, see Figure 1-4 A low-wear infrared objective lens zoom barrel structure includes a rear lens barrel 1, a front ball rack 2, a focusing barrel 3, a rear ball rack 4, balls 5 and a rear fixing seat 6. The front ball rack 2 and the rear ball rack 4 are fitted and installed on the outer circle of the rear lens barrel 1, and the focusing barrel 3 is installed on the balls 4 of the front ball rack 2 and the rear ball rack 4 so that the inner wall of the focusing barrel 3 is spaced from the outer wall of the rear lens barrel 1, and the rear fixing seat 6 is limitedly installed on the outer circle of the rear lens barrel 1 at the rear end of the rear ball rack 4.

[0019] The front ball rack 2 is installed on the outer circle of the rear lens barrel 1, and the ball 5 is installed on the front ball rack 2. Then the focusing barrel 3 is installed into the rear lens barrel 1 from the tail of the rear lens barrel 1, and then the ball 5 and the rear ball rack 4 are installed. Finally, it is fixed by the rear fixing seat 6. The rear lens barrel 1 and the focusing barrel 3 are respectively the inner and outer cam barrels in the zoom system. After the front ball rack 2 and the rear ball rack 4 are installed with the ball 5, the focusing barrel 3 and the rear lens barrel 1 can be installed non-contact, which reduces friction during the use of the product and reduces the overall processing accuracy of the structural parts.

[0020] See Figure 1-4 The front ball rack 2 and the rear ball rack 4 have the same structure and are arranged opposite to each other on the rear lens barrel 1. The bottom of the front ball rack 2 and the rear ball rack 4 are provided with limit blocks 21 that fit into the limit grooves on the rear lens barrel 1 and the rear fixed seat 6 to maintain the relative fixed position of the front ball rack 2 and the rear ball rack 4.

[0021] See Figure 1-4 The inner walls of the two ends of the focusing tube 3 are provided with inward inclined surfaces connected to the ball 5, and dust shielding pieces 31 are provided at both ends of the focusing tube 3 to prevent dust from falling in.

[0022] See Figure 1-4 The rear fixing seat 6 is threadedly mounted on the rear lens barrel 1 , and a fastening screw hole is opened through the side wall of the rear fixing seat 6 , and a tightening bolt 7 is installed in the fastening screw hole to facilitate disassembly and adjustment of the tightness of the fixing seat 6 .

[0023] Working process:

[0024] By rotating the focusing tube 3, the inner wall slopes at both ends of the focusing tube 3 and the ball 5 rotate, driving the lens group installed in the rear lens barrel 1 to move, thereby realizing the switching of the focal length. The rear fixing seat 6 is fixed by threaded installation and tightening bolts 7, which is convenient for adjusting the tightness of the fixation.

[0025] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-wear infrared objective lens zoom barrel structure, characterized by: The invention comprises a rear lens barrel (1), a front ball frame (2), a focusing barrel (3), a rear ball frame (4), a ball (5) and a rear fixed seat (6), wherein the front ball frame (2) and the rear ball frame (4) are fitted on the outer circle of the rear lens barrel (1), the focusing barrel (3) is mounted on the ball (5) of the front ball frame (2) and the rear ball frame (4) so that the inner wall of the focusing barrel (3) and the outer wall of the rear lens barrel (1) are spaced apart, and the rear fixed seat (6) is limitedly mounted on the outer circle of the rear lens barrel (1) at the rear end of the rear ball frame (4).

2. The low-wear infrared objective lens zoom barrel structure according to claim 1, characterized in that: The front ball rack (2) and the rear ball rack (4) have the same structure and are arranged opposite to each other on the rear lens barrel (1). The bottoms of the front ball rack (2) and the rear ball rack (4) are provided with limiting blocks (21) that fit into the limiting grooves on the rear lens barrel (1) and the rear fixing seat (6).

3. The low-wear infrared objective lens zoom barrel structure according to claim 1, characterized in that: Inwardly facing inclined surfaces are provided on the inner walls of both ends of the focusing tube (3) and are connected to the balls (5). Dust shielding sheets (31) are provided on both ends of the focusing tube (3).

4. The low-wear infrared objective lens zoom barrel structure according to claim 1, characterized in that: The rear fixing seat (6) is threadedly mounted on the rear lens barrel (1); a fastening screw hole is provided through the side wall of the rear fixing seat (6); a tightening bolt (7) is installed in the fastening screw hole.

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