Double-view-field infrared lens
Through the design of screws, couplings, motors, gap-extinguishing nuts and guide rail structures, combined with guide blocks and bias correction guide grooves, the field-of-view virtual focus problem of conventional dual-field infrared lenses in impact environments is solved, and the lens is stable switching and positioning in complex environments is achieved.
Patent Information
- Application Number
- CN202422392828.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-30
AI Technical Summary
Conventional dual-field infrared lenses are prone to dummy problems in field of view in impact environments, and the parts processing accuracy and driving mechanism are high.
The screw, coupling, motor, gap-elimination nut and guide rail structure are used to achieve zero-return difference conversion from rotational motion to linear motion, and the guide block and the correcting guide groove are used to ensure the stable movement of the switching mirror group on the optical axis.
Ensure the stable movement and precise positioning of the switching mirror group in an impact environment, avoid the field of visual focus, and adapt to complex mechanical environments.
Smart Images
Figure CN223244875U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical devices, in particular to a dual-field-of-view infrared lens. Background Art
[0002] With the development of infrared detection technology, infrared thermal imaging lenses have been widely used in military and civilian fields. Compared with single-field-of-view infrared thermal imaging lenses with fixed focal length and continuously zooming infrared thermal imaging lenses, dual-field-of-view infrared thermal imaging lenses can achieve target search in a wide field of view and target identification and tracking in a narrow field of view, with lower development costs and shorter design cycles.
[0003] Conventional dual-field-of-view infrared lenses use a motor to drive the zoom cam to rotate accordingly. The zoom curve groove and the zoom guide pin assembly drive the zoom slide to move along the zoom curve groove. Under the restriction of the straight groove, the rotational motion of the zoom slide is converted into linear motion for zooming. This type of lens requires high machining precision, and the matching precision requirements of the related parts of the drive mechanism are also very high. The transmission link is complex and requires high precision. In an impact environment, the system's field of view is prone to out-of-focus problems. Utility Model Content
[0004] In order to overcome the problems in the background technology, the utility model provides a dual-field-of-view infrared lens to solve the problem that the conventional dual-field-of-view infrared lens drives the zoom cam to rotate accordingly through a motor, and the field of view of the system is prone to out-of-focus in an impact environment.
[0005] A dual-field infrared lens includes a main lens barrel, a screw, a coupling, a motor, an anti-backlash nut, a guide rail, and a switching lens group. The top of the main lens barrel is an adjustment platform. The main lens barrel includes a front fixed lens group and a rear fixed lens group. The screw is installed on the adjustment platform through a set of support seats. The rear end of the screw is connected to the coupling and the motor. The front part of the screw is installed with an anti-backlash nut. The guide rail is installed on one side of the screw. The slider of the guide rail is connected to the anti-backlash nut. The switching lens group is coaxially arranged between the front fixed lens group and the rear fixed lens group. The top of the switching lens group is connected to the slider through a matching block.
[0006] Furthermore, a guide block coaxial with the main lens barrel is provided on the bottom wall of the main lens barrel, and a correction guide groove is provided at the bottom of the switching lens group to slide with the guide block.
[0007] Furthermore, the deviation-correcting guide groove is clearance-matched with the guide block, and a ball is installed in the deviation guide groove and is slidably installed with the guide block.
[0008] Compared with the prior art, the beneficial effects of the present invention are:
[0009] The present application is provided with a screw, a coupling, a motor, an anti-backlash nut and a guide rail to realize the zero-backlash conversion from rotational motion to linear motion, so that the switching lens group can move on the optical axis, thereby realizing the switching of wide and narrow fields of view. The present application is provided with a guide block and a correction guide groove to avoid radial offset of the switching lens group in an impact environment, ensure the stable movement of the switching lens group, realize the precise and reliable positioning of the switching lens assembly on the optical axis, and effectively adapt to the complex mechanical environment of vibration or impact. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] 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.
[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0012] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;
[0013] Figure 3 This is a schematic diagram of the switching mirror assembly structure of the present utility model.
[0014] 1-main lens barrel, 11-adjustment platform, 12-front fixed lens group, 13-rear fixed lens group, 2-screw, 3-coupling, 4-motor, 5-anti-backlash nut, 6-guide rail, 61-slider, 7-switching lens group, 71-matching block, 8-correction guide groove, 81-ball, 9-guide block. DETAILED DESCRIPTION
[0015] 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.
[0016] The utility model proposes a dual-field infrared lens, see Figure 1-3 A dual-field infrared lens includes a main lens barrel 1, a screw 2, a coupling 3, a motor 4, an anti-backlash nut 5, a guide rail 6, and a switching lens group 7. The top of the main lens barrel 1 is an adjustment platform 11. The main lens barrel 1 includes a front fixed lens group 12 and a rear fixed lens group 13. The screw 2 is installed on the adjustment platform 11 through a group of support seats 21. The rear end of the screw 2 is connected to the coupling 3 and the motor 4. The front part of the screw 2 is installed with an anti-backlash nut 5. The guide rail 6 is installed on one side of the screw 2. The slider 61 of the guide rail 6 is connected to the anti-backlash nut 5. The switching lens group 7 is coaxially arranged between the front fixed lens group 12 and the rear fixed lens group 13. The top of the switching lens group 7 is connected to the slider 61 through a matching block 71.
[0017] The slider 61 of the guide rail 6 is respectively connected to the anti-backlash nut 5 and the matching block 71 of the switching mirror group 7. The engagement of the anti-backlash nut 5 and the screw 2 has the ability to eliminate the engagement gap and self-lock. The anti-backlash nut 5 can enable the switching mirror group 7 to move precisely on the optical axis after the motor 4 drives the screw 2 to rotate, effectively adapting to the complex mechanical environment of vibration or impact, and avoiding the problem of out-of-focus in the field of view of the system of the traditional switching mirror group 7 structure under impact environment.
[0018] See Figure 1-3 A guide block 8 coaxial with the main lens barrel 1 is provided on the bottom wall of the main lens barrel 1, and a correction guide groove 8 is provided at the bottom of the switching lens group 7 to slide with the guide block 9, which can avoid radial deviation of the switching lens group 7 under impact environment and ensure stable movement of the switching lens group 7.
[0019] See Figure 1-3 The correction guide groove 8 is clearance-matched with the guide block 9. A ball 81 is installed in the correction guide groove 8 and is slidably installed with the guide block 9, which can reduce sliding resistance and wear and make the movement of the switching mirror group 7 efficient and stable.
[0020] Working process:
[0021] The starting motor 4 drives the coupling 3 and the screw 2 to rotate, and the anti-backlash nut 5 moves linearly on the screw 2 to drive the slider 61 of the guide rail 6 to move. The slider 61 drives the switching lens group 7 to move on the optical axis along the guide block 9 in the main lens barrel 1 to realize the field of view switching.
[0022] 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 dual-field-of-view infrared lens, characterized by: The invention comprises a main lens barrel (1), a screw rod (2), a coupling (3), a motor (4), an anti-backlash nut (5), a guide rail (6), and a switching lens group (7). The top of the main lens barrel (1) is an adjustment platform (11). The main lens barrel (1) comprises a front fixed lens group (12) and a rear fixed lens group (13). The screw rod (2) is mounted on the adjustment platform (11) through a set of support seats (21). The rear end of the screw rod (2) is connected to the coupling (3) and the motor (4). The front part of the screw rod (2) is mounted with an anti-backlash nut (5). The guide rail (6) is mounted on one side of the screw rod (2). The slider (61) of the guide rail (6) is connected to the anti-backlash nut (5). The switching lens group (7) is coaxially arranged between the front fixed lens group (12) and the rear fixed lens group (13). The top of the switching lens group (7) is connected to the slider (61) through a matching block (71).
2. The dual-field-of-view infrared lens according to claim 1, characterized in that: A guide block (9) coaxial with the main lens barrel (1) is provided on the bottom wall of the main lens barrel (1), and a correction guide groove (8) is provided at the bottom of the switching lens group (7) to slide with the guide block (9).
3. The dual-field-of-view infrared lens according to claim 2, characterized in that: The deviation-correcting guide groove (8) is clearance-matched with the guide block (9), and a ball (81) is installed in the deviation-correcting guide groove (8) and is slidably mounted with the guide block (9).