Focusing structure, double-view-field lens and focusing method

Abstract

The invention discloses a focusing structure, a double-view-field lens and a focusing method.The focusing structure comprises a limiting barrel, a coarse adjustment button, a fine adjustment button, a first sliding rod, a second sliding rod, an outer lens barrel and an inner lens barrel coaxial with the outer lens barrel, a side adjustment base is arranged on the peripheral face of the outer lens barrel, and the limiting barrel is connected with the outer lens barrel through the side adjustment base; the limiting barrel is perpendicular to the outer lens barrel, a linear through groove coaxial with the outer lens barrel and an arc-shaped through groove with the midpoint of the linear through groove as the circle center are formed in the side adjusting seat, the fine adjusting button and the coarse adjusting button are both installed in the limiting barrel and can rotate in the axial direction of the limiting barrel, and an S-shaped groove used for providing a movement path of the first sliding rod is formed in the bottom of the fine adjusting button. One end of the first sliding rod is connected with the inner lens cone, the other end of the first sliding rod penetrates through the linear through groove and then is embedded into the S-shaped groove, a sliding groove is formed in the coarse adjustment button and is arranged in the axial direction of the limiting cylinder, one end of the second sliding rod is connected with the inner lens cone, and the other end of the second sliding rod penetrates through the arc-shaped through groove and then is embedded into the sliding groove.

Description

Technical Field

[0001] The present invention is applied to the field of optical lenses, and in particular relates to a focusing structure, a dual-field lens and a focusing method. Background Art

[0002] Because the field of view of a telephoto lens is small, it is more difficult to find the subject, while the field of view of a short-focus lens is larger. If you use a short-focus lens to find the subject and then switch to a telephoto lens to shoot or observe, it will take time and it is easy to lose the subject. By using a dual-field-of-view lens, you can quickly switch to the telephoto lens to continue tracking and observing after finding the subject in the short focal length. A dual-field-of-view lens refers to a lens that uses the same optical system but moves the position of some lenses to give the system different focal lengths.

[0003] In existing dual-field-of-view lenses, the method of using a single focus ring for simultaneous coarse and fine adjustments has the problem of a long focus ring stroke and inconvenience in use. In the method of using two focus rings for adjustment, one focus ring is responsible for coarse adjustment and the other focus ring is responsible for fine adjustment. Dual-field-of-view lenses using these two methods require a large space to be reserved and are not convenient to operate. If electric focus is used, the motor and transmission structure need to be fixed on the lens and focus ring. Although the reserved operating space can be reduced, doing so is costly and the failure rate will also increase. On the other hand, the hand rotation range of the existing dual-field-of-view lens is large during operation, and if one-handed operation may cause image jitter, it will also take more time to focus due to the inconvenience of operation, resulting in loss of the shooting target. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a focusing structure, a dual-field-of-view lens and a focusing method. The focusing structure is compact and the dual-field-of-view lens using the focusing structure is convenient for focusing operation.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A focusing structure comprises a limiting cylinder, a coarse adjustment knob, a fine adjustment knob, a first slide bar, a second slide bar, an outer barrel and an inner barrel coaxially arranged with the outer barrel, a side adjustment seat is provided on the outer circumference of the outer barrel, the limiting cylinder is connected to the outer barrel via the side adjustment seat, the limiting cylinder is perpendicular to the outer barrel, a straight through groove coaxially arranged with the outer barrel and an arc-shaped through groove with the midpoint of the straight through groove as the center of the circle is provided on the side adjustment seat, the fine adjustment knob and the coarse adjustment knob are both installed in the limiting cylinder and can rotate around the The axial rotation of the limiting cylinder, the bottom of the fine adjustment button is provided with an S-shaped groove for providing the movement path of the first slide bar, one end of the first slide bar is connected to the inner barrel, and the other end of the first slide bar passes through the linear through groove and is embedded in the S-shaped groove, the coarse adjustment button is provided with a slide groove for providing the movement path of the second slide bar, the slide groove is arranged along the axial direction of the limiting cylinder, one end of the second slide bar is connected to the inner barrel, and the other end of the second slide bar passes through the circular arc through groove and is embedded in the slide groove.

[0007] Preferably, two shift forks are provided on the coarse adjustment button along the axial direction of the limiting cylinder, the slide groove is formed between the two shift forks, the end of the second slide rod is embedded between the two shift forks, and the bottoms of the two shift forks are embedded in the arc-shaped through groove.

[0008] Preferably, a first positioning surface is provided on the inner circumference of the outer barrel, and the inner barrel slides axially in the outer barrel via the first positioning surface, and a first sealing ring is provided between the inner barrel and the outer barrel.

[0009] Preferably, the limiting cylinder includes a first step portion located at the top and a second step portion located at the bottom, the diameter of the second step portion is larger than the diameter of the first step portion, the top of the side adjustment seat is provided with a first protrusion, the first protrusion is provided with an external thread, and the inner periphery of the second step portion is provided with an internal thread matching the external thread.

[0010] Preferably, a pressure ring is provided on the inner periphery of the first step portion, and the pressure ring is connected to the first step portion by a thread. A second protrusion is provided on the outer periphery of the fine adjustment button, and the pressure ring is pressed on the top of the second protrusion. A second sealing ring is provided between the fine adjustment button and the first step portion, and a first annular groove for installing the second sealing ring is provided on the second protrusion.

[0011] Preferably, the coarse adjustment button is located at the bottom of the first step portion, the coarse adjustment button is located on the inner periphery of the first protrusion, the inner periphery of the first protrusion forms a second positioning surface for fixing the coarse adjustment button, a third sealing ring is provided between the coarse adjustment button and the first protrusion, and the outer periphery of the coarse adjustment button is provided with a second annular groove for installing the third sealing ring.

[0012] Preferably, a threaded countersunk hole is provided on the outer periphery of the inner lens barrel, the bottom of the first slide rod and the bottom of the second slide rod are both provided with external threads matching the threaded countersunk hole, and the top end surfaces of the first slide rod and the second slide rod are both provided with a cross groove.

[0013] Preferably, the outer periphery of the coarse adjustment button is connected to a coarse adjustment lever, the outer periphery of the coarse adjustment button is provided with a groove for installing the coarse adjustment lever, the outer periphery of the fine adjustment button is provided with a fine adjustment handwheel, the fine adjustment handwheel is located at the top of the fine adjustment button, and the fine adjustment button and the fine adjustment handwheel are connected by screws.

[0014] The present invention also provides a dual-field lens, comprising the focusing structure described in any one of the above items, wherein a first lens is installed in the outer lens barrel, and a second lens is installed in the inner lens barrel.

[0015] The present invention also provides a focusing method using the dual-field lens, comprising the following steps:

[0016] Step 1: At the short focal length, turn the fine adjustment knob to focus and find the subject;

[0017] Step 2: Turn the fine adjustment knob to continuously increase the distance between the front end of the inner lens barrel and the front end of the outer lens barrel until a critical position is reached, and then push the coarse adjustment knob to switch the short focal length to the long focal length;

[0018] Step 3: At the telephoto range, turn the fine adjustment knob to focus on the subject.

[0019] One of the above technical solutions has at least one of the following advantages or beneficial effects: the focusing structure realizes the segmented fine adjustment and coarse adjustment of the dual-field-of-view lens through the S-shaped groove. When the first slide bar is located in the middle position of the S-shaped groove, the coarse adjustment knob is used to drive the second slide bar to move, driving the inner barrel to move significantly, thereby switching the focus position and switching between short focus and long focus, reducing the moving stroke of a single focusing knob. When the first slide bar is located at both ends of the S-shaped groove, the fine adjustment knob is used to drive the first slide bar to move, driving the inner barrel to move slightly, thereby achieving fine adjustment of the focus. This focusing structure makes the dual-field-of-view lens smaller in size, more suitable for one-handed operation, and more convenient to use.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0022] Figure 1is a perspective view of an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view along the axial direction of the outer barrel of an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the structure of the outer lens barrel and the side adjustment seat in one embodiment of the present invention;

[0025] Figure 4 is a cross-sectional view along the radial direction of the outer barrel of an embodiment of the present invention;

[0026] Figure 5 is a perspective view of a coarse adjustment knob according to one embodiment of the present invention;

[0027] Figure 6 is a perspective view of a fine adjustment knob according to one embodiment of the present invention;

[0028] Figure 7 This is one of the working state schematic diagrams of an embodiment of the present invention;

[0029] Figure 8 This is the second working state diagram of an embodiment of the present invention;

[0030] Figure 9 This is the third working state diagram of an embodiment of the present invention;

[0031] Figure 10 This is the fourth working state diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0032] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0033] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0034] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] in, Figure 2 and Figure 3 The reference direction coordinate system of the embodiment of the present invention is given below. Figure 2 and Figure 3 The embodiment of the present invention is described with reference to the direction shown.

[0037] An embodiment of the present invention provides a focusing structure, including a limiting cylinder 100, a coarse adjustment knob 400, a fine adjustment knob 500, a first slide bar 600, a second slide bar 700, an outer barrel 300, and an inner barrel 200 coaxially arranged with the outer barrel 300, a side adjustment seat 310 is provided on the outer circumference of the outer barrel 300, the limiting cylinder 100 is connected to the outer barrel 300 via the side adjustment seat 310, the limiting cylinder 100 is perpendicular to the outer barrel 300, and the side adjustment seat 310 is provided with a linear through groove 311 coaxially arranged with the outer barrel 300 and The arc-shaped through groove 312 is set with the midpoint of the linear through groove 311 as the center of the circle. The fine adjustment button 500 and the coarse adjustment button 400 are both installed in the limit cylinder 100 and can rotate around the axial direction of the limit cylinder 100. The bottom of the fine adjustment button 500 is provided with an S-shaped groove 510 for providing a movement path for the first slide bar 600. One end of the first slide bar 600 is connected to the inner barrel 200, and the other end of the first slide bar 600 passes through the linear through groove 311 and is embedded in the S-shaped groove 510. The coarse adjustment button 400 is provided with a groove for providing a movement path for the second slide bar 700. The slide groove 410 of the path is arranged along the axial direction of the limiting cylinder 100. One end of the second slide bar 700 is connected to the inner barrel 200. The other end of the second slide bar 700 passes through the arc-shaped through groove 312 and is embedded in the slide groove 410. When the inner barrel 200 moves axially, the first slide bar 600 and the second slide bar 700 move the same distance. The focusing structure realizes the fine adjustment and coarse adjustment of the dual-field lens through the S-shaped groove 510. When the first slide bar 600 is located in the middle position of the S-shaped groove 510, the first slide bar 600 and the second slide bar 700 move the same distance. When the first slide bar 600 is at the two ends of the S-shaped groove 510, the fine adjustment knob 500 is used to drive the first slide bar 600 to move, which drives the inner lens barrel 200 to move slightly to achieve fine focus adjustment. This focusing structure makes the dual-field lens smaller in size, more suitable for one-handed operation, and more convenient to use.

[0038] As a preferred embodiment of the present invention, two shift forks 420 are provided on the coarse adjustment button 400 along the axial direction of the limiting cylinder 100, and a slide groove 410 is formed between the two shift forks 420. The end of the second slide rod 700 is embedded between the two shift forks 420, and the bottom of the two shift forks 420 is embedded in the arc-shaped through groove 312.

[0039] Preferably, the inner circumference of the outer barrel 300 is provided with a first positioning surface, and the inner barrel 200 slides axially in the outer barrel 300 through the first positioning surface. A first sealing ring 210 is provided between the inner barrel 200 and the outer barrel 300, and the first sealing ring 210 is used for sealing and adjusting damping.

[0040] Preferably, see Figure 4The limiting cylinder 100 includes a first step portion 110 at the top and a second step portion 120 at the bottom. The diameter of the second step portion 120 is larger than the diameter of the first step portion 110. A first protrusion 320 is provided at the top of the side adjustment seat 310. The first protrusion 320 is provided with an external thread, and the inner periphery of the second step portion 120 is provided with an internal thread matching the external thread.

[0041] In certain embodiments, see Figure 4 A pressure ring 130 is provided on the inner periphery of the first step portion 110, and the pressure ring 130 is connected to the first step portion 110 by a threaded connection. A second protrusion 520 is provided on the outer periphery of the fine-tuning button 500, and the pressure ring 130 is pressed on the top of the second protrusion 520. A second sealing ring 530 is provided between the fine-tuning button 500 and the first step portion 110, and a first annular groove 521 for installing the second sealing ring 530 is provided on the second protrusion 520. The second sealing ring 530 is used to seal and adjust the damping during rotation. Preferably, the fine-tuning button 500 is a cylindrical component, and the second protrusion 520 is located in the middle position of the fine-tuning button 500.

[0042] See also Figure 4 The coarse adjustment button 400 is located at the bottom of the first step 110, and the coarse adjustment button 400 is located on the inner periphery of the first protrusion 320. The inner periphery of the first protrusion 320 forms a second positioning surface for fixing the coarse adjustment button 400. A third sealing ring 430 is provided between the coarse adjustment button 400 and the first protrusion 320. The outer periphery of the coarse adjustment button 400 is provided with a second annular groove 440 for installing the third sealing ring 430. The third sealing ring 430 is used for sealing and adjusting the damping during rotation.

[0043] As a preferred embodiment of the present invention, the outer periphery of the inner barrel 200 is provided with a threaded countersunk hole, the bottom of the first slide bar 600 and the bottom of the second slide bar 700 are both provided with an external thread that matches the threaded countersunk hole, and the top end surfaces of the first slide bar 600 and the second slide bar 700 are both provided with a cross groove, which is used to screw the first slide bar 600 and the second slide bar 700 onto the inner barrel 200.

[0044] Preferably, see Figure 4 、 Figure 5 The outer periphery of the coarse adjustment button 400 is connected to the coarse adjustment lever 450, and a groove for installing the coarse adjustment lever 450 is provided on the outer periphery of the coarse adjustment button 400. The groove is arc-shaped. Preferably, the groove and the fork 420 are arranged on both sides of the coarse adjustment button 400 relative to each other.

[0045] As a preferred embodiment of the present invention, see Figure 2 A fine adjustment hand wheel 540 is provided on the periphery of the fine adjustment button 500. The fine adjustment hand wheel 540 is located at the top of the fine adjustment button 500. The fine adjustment button 500 and the fine adjustment hand wheel 540 are connected by screws.

[0046] An embodiment of the present invention further provides a dual-field lens, comprising the focusing structure in any of the above embodiments, wherein a first lens is installed in the outer lens barrel 300 and a second lens is installed in the inner lens barrel 200 .

[0047] The present invention also provides a focusing method using the dual-field lens, comprising the following steps:

[0048] Step 1: At the short focal length, turn the fine adjustment knob 500 to focus on the subject. At this time, the position relationship between the first slide bar 600 and the second slide bar 700 is as follows: Figure 7 As shown;

[0049] Step 2: Turn the fine adjustment knob 500 to continuously increase the distance between the front end of the inner lens barrel 200 and the front end of the outer lens barrel 300 until the critical position (i.e., the first slide bar 600 just reaches the middle position of the S-shaped groove 510). At this time, the positional relationship between the first slide bar 600 and the second slide bar 700 is as follows: Figure 8 As shown, after reaching the critical position, the coarse adjustment knob 400 is pushed to switch the short focal length to the long focal length (i.e., the first slide bar 600 is about to leave the middle position of the S-shaped groove 510). At this time, the positional relationship between the first slide bar 600 and the second slide bar 700 is as shown in FIG. Figure 9 As shown;

[0050] Step 3: At the telephoto range, turn the fine adjustment knob 500 to focus on the subject. At this time, the position relationship between the first slide bar 600 and the second slide bar 700 is as follows: Figure 10 shown.

[0051] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A focusing structure, characterized in that: The invention comprises a limiting cylinder, a coarse adjustment button, a fine adjustment button, a first slide bar, a second slide bar, an outer barrel and an inner barrel coaxially arranged with the outer barrel, a side adjustment seat is provided on the outer circumference of the outer barrel, the limiting cylinder is connected to the outer barrel through the side adjustment seat, the limiting cylinder is perpendicular to the outer barrel, the side adjustment seat is provided with a straight through groove coaxially arranged with the outer barrel and an arc-shaped through groove with the midpoint of the straight through groove as the center, the fine adjustment button and the coarse adjustment button are both installed in the limiting cylinder and can rotate around the limiting cylinder Axial rotation, the bottom of the fine adjustment knob is provided with an S-shaped groove for providing a movement path of the first slide bar, one end of the first slide bar is connected to the inner barrel, and the other end of the first slide bar passes through the linear through groove and is embedded in the S-shaped groove, the coarse adjustment knob is provided with a slide groove for providing a movement path of the second slide bar, the slide groove is arranged along the axial direction of the limiting cylinder, one end of the second slide bar is connected to the inner barrel, and the other end of the second slide bar passes through the circular arc through groove and is embedded in the slide groove.

2. The focusing structure according to claim 1, wherein: Two shift forks are provided on the coarse adjustment knob along the axial direction of the limiting cylinder, the slide groove is formed between the two shift forks, the end of the second slide rod is embedded between the two shift forks, and the bottoms of the two shift forks are embedded in the arc-shaped through groove.

3. The focusing structure according to claim 1, wherein: The inner circumference of the outer barrel is provided with a first positioning surface, and the inner barrel slides axially in the outer barrel via the first positioning surface. A first sealing ring is provided between the inner barrel and the outer barrel.

4. The focusing structure according to claim 1, wherein: The limiting cylinder includes a first step portion at the top and a second step portion at the bottom, the diameter of the second step portion is larger than the diameter of the first step portion, the top of the side adjustment seat is provided with a first protrusion, the first protrusion is provided with an external thread, and the inner periphery of the second step portion is provided with an internal thread matching the external thread.

5. The focusing structure according to claim 4, wherein: A pressure ring is provided on the inner periphery of the first step portion, and the pressure ring is connected to the first step portion by a thread. A second protrusion is provided on the outer periphery of the fine adjustment button, and the pressure ring is pressed on the top of the second protrusion. A second sealing ring is provided between the fine adjustment button and the first step portion, and a first annular groove for installing the second sealing ring is provided on the second protrusion.

6. The focusing structure according to claim 4, wherein: The coarse adjustment button is located at the bottom of the first step portion, and the coarse adjustment button is located on the inner periphery of the first protrusion. The inner periphery of the first protrusion forms a second positioning surface for fixing the coarse adjustment button. A third sealing ring is provided between the coarse adjustment button and the first protrusion, and a second annular groove for installing the third sealing ring is provided on the outer periphery of the coarse adjustment button.

7. The focusing structure according to claim 1, wherein: The outer periphery of the inner lens barrel is provided with a threaded countersunk hole, the bottom of the first slide rod and the bottom of the second slide rod are both provided with external threads matching the threaded countersunk hole, and the top end surfaces of the first slide rod and the second slide rod are both provided with a cross groove.

8. The focusing structure according to claim 1, wherein: The outer periphery of the coarse adjustment button is connected to a coarse adjustment lever, and the outer periphery of the coarse adjustment button is provided with a groove for installing the coarse adjustment lever. The outer periphery of the fine adjustment button is provided with a fine adjustment handwheel, and the fine adjustment handwheel is located at the top of the fine adjustment button. The fine adjustment button and the fine adjustment handwheel are connected by screws.

9. A dual-field-of-view lens, characterized in that: The focusing structure comprises the focusing structure according to any one of claims 1 to 8, wherein a first lens is installed in the outer lens barrel, and a second lens is installed in the inner lens barrel.

10. A focusing method using the dual-field lens according to claim 9, characterized in that The steps include: Step 1: At the short focal length, turn the fine adjustment knob to focus and find the subject; Step 2: Turn the fine adjustment knob to continuously increase the distance between the front end of the inner lens barrel and the front end of the outer lens barrel until a critical position is reached, and then push the coarse adjustment knob to switch the short focal length to the long focal length; Step 3: At the telephoto range, turn the fine adjustment knob to focus on the subject.

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