Lens focusing mechanism for head-mounted thermal imager

Abstract

The invention belongs to the field of infrared thermal imaging, and specifically is a lens focusing mechanism for a head-mounted thermal imager, comprising a lens focusing mechanism body and a lens cover body, wherein a head-mounted thermal imager main shell is arranged at the bottom of the lens focusing mechanism body, a head-mounted thermal imager main shell is arranged at the bottom of the lens cover body, the head-mounted thermal imager main shell comprises a fixing seat, the lens focusing mechanism body comprises a distance adjustment pressure ring, a lens barrel, a slide groove cam barrel, a distance adjustment screw and a focusing ring, the outer wall of the lens barrel is provided with a distance adjustment screw, and the outer wall of the lens barrel is provided with a slide groove cam barrel; the focusing requirement is achieved by moving a lever of the focusing mechanism by fingers, thereby solving the problem that it is inconvenient to focus when the focal length of the existing infrared lens is small (≤15mm), and at the same time, the lens cover matched with the infrared lens mechanism adopts a snap-on match and a button operation, thereby effectively solving the problem that the existing lens cover fails to be fixed after long-term use.

Description

Technical Field

[0001] The invention relates to the field of infrared thermal imaging, in particular to a lens focusing mechanism for a head-mounted thermal imager. Background Art

[0002] In order to obtain a clear image, currently most infrared lenses use a manually rotated focus wheel to drive the inner lens barrel to achieve focusing operation. When the focal length of the infrared lens is small (≤15mm), the diameter of the lens is relatively small, and the corresponding outline size of the focus hand wheel is also small. At this time, it is not very convenient to focus by manually turning the focus wheel. At the same time, the lens cover that matches the infrared lens is mostly fixed by an interference fit between plastic parts and plastic parts, or between plastic parts and silicone rubber parts. This method has problems such as wear of the parts fitting and failure of the lens cover fixation after long-term use;

[0003] Therefore, in order to solve the above problems, a lens focusing mechanism for a head-mounted thermal imager is proposed. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art and solve the problem of obtaining clear images, currently infrared lenses mostly use a manually rotated focus wheel to drive the inner lens barrel to achieve focusing operation. When the focal length of the infrared lens is small (≤15mm), the aperture of the lens is relatively small, and the outline size of the corresponding focusing hand wheel is also small. At this time, it is not very convenient to focus by manually turning the focus wheel. At the same time, the lens cover matched with the infrared lens is mostly fixed by an interference fit between plastic parts and plastic parts, or between plastic parts and silicone rubber parts. This method has problems such as wear of the parts fitting and failure of lens cover fixing after long-term use. The present invention proposes a lens focusing mechanism for a head-mounted thermal imager.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: a lens focusing mechanism for a head-mounted thermal imager according to the present invention comprises a lens focusing mechanism body and a lens cover body, a head-mounted thermal imager main shell is arranged at the bottom of the lens focusing mechanism body, a head-mounted thermal imager main shell is arranged at the bottom of the lens cover body, the head-mounted thermal imager main shell comprises a fixing seat, the lens focusing mechanism body comprises a distance adjustment pressure ring, a lens barrel, a slide groove cam barrel, a distance adjustment screw and a focus ring, a distance adjustment screw is arranged on the outer wall of the lens barrel, a slide groove cam barrel is arranged on the outer wall of the lens barrel, and a focus ring is arranged on the outer wall of the slide groove cam barrel;

[0006] The focus ring includes a lever and a limiting boss, and the lever is arranged on the outer wall of the limiting boss, and the outer wall of the lens barrel is provided with a distance adjustment pressure ring; the focus ring and the slide groove cam barrel are matched by a card slot, and the focus ring and the slide groove cam barrel form a whole when focusing, and the slide groove cam barrel is connected to the fixed seat and the lens barrel by a distance adjustment screw, and the lens cover body includes a lens cover body, a spring, a button, a cylindrical pin A, a double torsion spring and a cylindrical pin B, and the outer wall of the cylindrical pin B is provided with a double torsion spring;

[0007] The double torsion spring includes a double pin and a retaining ring, and one end of the double pin is fixedly connected to the retaining ring. A lens cover body is arranged on one side of the double torsion spring, a cylindrical pin A is arranged on the front of the lens cover body, a button is arranged on the outer wall of the cylindrical pin A, and a spring is arranged at the bottom of the button.

[0008] The lever can be used to control the focus ring more effectively, the cooperation between the double pins and the retaining ring can effectively ensure the torque effect of the double torsion spring, the screw connection can effectively improve the installation and disassembly efficiency, and also better ensure the fixing stability.

[0009] Preferably, the lens cover body is connected to the main shell of the head-mounted thermal imager through a cylindrical pin B, and the cylindrical pin B and the main shell of the head-mounted thermal imager form a through structure, and the cylindrical pin B can more stably ensure the position fixing stability of the lens cover body.

[0010] Preferably, the distance adjustment pressure ring is connected to the fixing seat by threads, and when the lens is focused, the lever of the focus ring is moved to drive the slide groove cam tube to rotate. The rotation is controlled by the isomorphic lever, which can effectively improve the rotation efficiency and stability.

[0011] Preferably, the double pins at both ends of the double torsion spring are inserted into the circular holes of the lens cover body, and the retaining ring in the middle of the double torsion spring is inserted into the main shell of the head-mounted thermal imager. The double pins of the double torsion spring can be used to more stably limit the connection position of the lens cover body, and the operating stability of the double torsion spring is also better guaranteed.

[0012] Preferably, the lens cover body can be closed when the lens cover body is pressed, and at this time, the buckle position of the button cooperates with the limiting boss of the focus ring, so that the lens cover body can be controlled more conveniently through the button.

[0013] The present invention is beneficial in that:

[0014] The present invention realizes the focusing demand by moving the lever of the focusing mechanism with a finger, thereby solving the problem that the existing infrared lens is inconvenient to focus when the focal length is small (≤15mm). At the same time, the lens cover matched with the infrared lens mechanism adopts a snap-fitting and a button-type operation, which can effectively solve the problem that the existing lens cover fails to be fixed after long-term use. When the focal length of the infrared lens is small (≤15mm), the lens cover can be conveniently operated. The lens cover is fixed by a button snap-fitting, and this fixing method is reliable and not prone to failure after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A partial stereogram of the present invention installed on a head-mounted thermal imager;

[0017] Figure 2 is a cross-sectional view of the lens cover of the present invention when it is closed;

[0018] Figure 3 is a cross-sectional view of the lens cover of the present invention when it is opened;

[0019] Figure 4 is a schematic diagram of the focus ring structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the double torsion spring structure of the present invention.

[0021] In the figure: 1. Main shell of head-mounted thermal imager; 11. Fixing seat; 2. Lens focusing mechanism body; 21. Distance adjustment pressure ring; 22. Lens barrel; 23. Slide cam barrel; 24. Distance adjustment screw; 25. Focusing ring; 251. Lever; 252. Limiting boss; 3. Lens cover body; 31. Lens cover body; 32. Spring; 33. Button; 34. Cylindrical pin A; 35. Double torsion spring; 351. Double pin; 352. Retaining ring; 36. Cylindrical pin B. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0023] See also Figure 1-5 As shown, a lens focusing mechanism for a head-mounted thermal imager is characterized in that: it includes a lens focusing mechanism body 2 and a lens cover body 3, the bottom of the lens focusing mechanism body 2 is provided with a head-mounted thermal imager main shell 1, the bottom of the lens cover body 3 is provided with a head-mounted thermal imager main shell 1, the head-mounted thermal imager main shell 1 includes a fixing seat 11, the lens focusing mechanism body 2 includes a distance adjustment pressure ring 21, a lens barrel 22, a slide groove cam barrel 23, a distance adjustment screw 24 and a focus ring 25, the outer wall of the lens barrel 22 is provided with a distance adjustment screw 24, the outer wall of the lens barrel 22 is provided with a slide groove cam barrel 23, and the outer wall of the slide groove cam barrel 23 is provided with a focus ring 25;

[0024] The focus ring 25 includes a lever 251 and a limiting boss 252, and the lever 251 is arranged on the outer wall of the limiting boss 252, and the distance adjustment pressure ring 21 is arranged on the outer wall of the lens barrel 22; the focus ring 25 and the slide groove cam barrel 23 are matched by a card slot, and the focus ring 25 and the slide groove cam barrel 23 form a whole when focusing, and the slide groove cam barrel 23 is connected to the fixing seat 11 and the lens barrel 22 by the distance adjustment screw 24, and the lens cover body 3 includes a lens cover body 31, a spring 32, a button 33, a cylindrical pin A34, a double torsion spring 35 and a cylindrical pin B36, and the outer wall of the cylindrical pin B36 is provided with a double torsion spring 35;

[0025] The double torsion spring 35 includes a double pin 351 and a retaining ring 352, and one end of the double pin 351 is fixedly connected to the retaining ring 352. A lens cover body 31 is set on one side of the double torsion spring 35, a cylindrical pin A34 is set on the front of the lens cover body 31, a button 33 is set on the outer wall of the cylindrical pin A34, and a spring 32 is set at the bottom of the button 33.

[0026] In this embodiment, the lens cover body 3 is connected to the main shell 1 of the head-mounted thermal imager through a cylindrical pin B36, and the cylindrical pin B36 and the main shell 1 of the head-mounted thermal imager form a through structure; when working, the lens cover body 3 can be better rotated with the main shell 1 of the head-mounted thermal imager through the cylindrical pin B36.

[0027] In this embodiment, the distance-adjusting pressure ring 21 is connected to the fixed seat 11 through threads. When the lens is focused, the lever 251 of the focus ring 25 is moved to drive the slide groove cam tube 23 to rotate. During operation, the connection efficiency between the distance-adjusting pressure ring 21 and the fixed seat 11 can be better improved.

[0028] In this embodiment, the double pins 351 at both ends of the double torsion spring 35 are inserted into the circular holes of the lens cover body 31, and the retaining ring 352 in the middle of the double torsion spring 35 is inserted into the main shell 1 of the head-mounted thermal imager; when working, it can better ensure the stability of the position fixation of the double torsion spring 35 when the equipment is in use.

[0029] In this embodiment, the lens cover can be closed by pressing the lens cover body 31, at which time the buckle position of the button 33 cooperates with the limiting boss 252 of the focus ring 25; during operation, the fixing stability of the lens cover body 31 can be better guaranteed.

[0030] Working principle: a runway-shaped limit groove is provided on the side wall of the fixing seat 11 at the upper end of the main housing 1 of the head-mounted thermal imager. The limit groove can control the focusing stroke of the lens. The focusing ring 25 cooperates with the slide cam barrel 23 by means of a card slot. When focusing, the focusing ring 25 and the slide cam barrel 23 rotate as a whole. The gap between the distance adjustment pressure ring 21 and the focusing ring 25 can be adjusted to control the feel when focusing. A lever 251 is provided on the side wall of the focusing ring 25. When focusing the lens, the lever 251 on the side wall of the focusing ring 25 is moved to drive the slide cam barrel 23 to rotate. The cam barrel rotates and drives the adjusting The distance screw 24 drives the lens barrel 22 to make a linear motion in the fixing seat 11 to meet the focusing requirement. The double pins 351 at both ends of the double torsion spring 35 are inserted into the circular hole of the lens cover body 31. The retaining ring 352 in the middle of the double torsion spring 35 is inserted into the main shell 1 of the head-mounted thermal imager. The double torsion spring 35 can be designed to different angles according to the flip angle of the lens cover. The lens cover can be closed by pressing the lens cover body 31. At this time, the buckle position of the button 33 cooperates with the limiting boss 252 of the focus ring 25. When the button 33 is pressed, the buckle position is disengaged from the limiting boss 252 of the focus ring 25 to open the lens cover.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] 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, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A lens focusing mechanism for a head-mounted thermal imager, characterized in that: The invention comprises a lens focusing mechanism body (2) and a lens cover body (3); a head-mounted thermal imager main housing (1) is arranged at the bottom of the lens focusing mechanism body (2); a head-mounted thermal imager main housing (1) is arranged at the bottom of the lens cover body (3); the head-mounted thermal imager main housing (1) comprises a fixing seat (11); the lens focusing mechanism body (2) comprises a distance adjustment pressure ring (21), a lens barrel (22), a slide groove cam barrel (23), a distance adjustment screw (24) and a focus ring (25); the outer wall of the lens barrel (22) is provided with a distance adjustment screw (24); the outer wall of the lens barrel (22) is provided with a slide groove cam barrel (23); and the outer wall of the slide groove cam barrel (23) is provided with a focus ring (25); The focus ring (25) comprises a lever (251) and a limiting boss (252), and the lever (251) is arranged on the outer wall of the limiting boss (252), and the distance adjustment pressure ring (21) is arranged on the outer wall of the lens barrel (22); the focus ring (25) and the slide groove cam barrel (23) are matched by means of a card slot, and the focus ring (25) and the slide groove cam barrel (23) form a whole when focusing, and the slide groove cam barrel (23) is connected to the fixing seat (11) and the lens barrel (22) by a distance adjustment screw (24); the lens cover body (3) comprises a lens cover body (31), a spring (32), a button (33), a cylindrical pin A (34), a double torsion spring (35) and a cylindrical pin B (36), and the outer wall of the cylindrical pin B (36) is provided with a double torsion spring (35); The double torsion spring (35) comprises a double pin (351) and a retaining ring (352), and one end of the double pin (351) is fixedly connected to the retaining ring (352); a lens cover body (31) is arranged on one side of the double torsion spring (35); a cylindrical pin A (34) is arranged on the front of the lens cover body (31); a button (33) is arranged on the outer wall of the cylindrical pin A (34); and a spring (32) is arranged at the bottom of the button (33).

2. The lens focusing mechanism for a head-mounted thermal imager according to claim 1, characterized in that: The lens cover body (3) is connected to the main housing (1) of the head-mounted thermal imager via a cylindrical pin B (36), and the cylindrical pin B (36) and the main housing (1) of the head-mounted thermal imager form a through structure.

3. The lens focusing mechanism for a head-mounted thermal imager according to claim 1, characterized in that: The distance adjustment pressure ring (21) is connected to the fixing seat (11) via threads, and when the lens is focused, the lever (251) of the focus ring (25) is moved to drive the slide groove cam tube (23) to rotate.

4. The lens focusing mechanism for a head-mounted thermal imager according to claim 3, characterized in that: The double pins (351) at both ends of the double torsion spring (35) are inserted into the circular holes of the lens cover body (31), and the retaining ring (352) in the middle of the double torsion spring (35) is inserted into the main housing (1) of the head-mounted thermal imager.

5. The lens focusing mechanism for a head-mounted thermal imager according to claim 1, characterized in that: The lens cover can be closed by pressing the lens cover body (31), at which time the buckle position of the button (33) matches the limiting boss (252) of the focus ring (25).

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