Lens device with adjustable focal length

Abstract

The utility model relates to a lens device with an adjustable focal length, which comprises a lens barrel, the first end of the lens barrel is fixedly connected with an optical lens assembly, the second end of the lens barrel is fixedly connected with an eyepiece assembly, the lens barrel forms a hollow cylinder, and the lens barrel is provided with a first central axis coinciding with the optical axis of the optical lens assembly; the focusing assembly comprises a focusing frame, the focusing frame is arranged on the optical lens assembly, and the focusing frame moves along the optical axis to adjust the focal length of the optical lens assembly; and the adjusting knob is arranged on the outer side of the lens cone and is connected to the focusing frame through a connecting rod, and the adjusting knob rotates around the first central axis or a second central axis perpendicular to the first central axis so as to drive the focusing frame to move along the optical axis through the connecting rod.

Description

Technical Field

[0001] This application relates to the field of imaging equipment technology, and in particular to a lens device with adjustable focal length. Background Technology

[0002] Lenses are an important component of imaging devices. Due to different usage environments or different distances from the target being observed, operators need to adjust the focus of the lens when using imaging devices to obtain a clear image. Currently, most lenses in imaging devices use a manual rotating focusing wheel to adjust the distance between the optical lens and the image sensing unit to achieve the purpose of focusing.

[0003] However, since the rollers are usually designed as independent components outside the lens barrel, they are often too small and may be difficult to turn when used outdoors with gloves on. Summary of the Invention

[0004] The embodiments of this application provide a focal length adjustable lens device, wherein the adjustment knob for adjusting the lens focal length is disposed on the outer surface of the lens barrel, and can be adjusted by different rotation methods, which has the characteristics of convenient operation.

[0005] In one embodiment of this application, a focal length adjustable lens device is provided, comprising:

[0006] A lens barrel, wherein an optical lens assembly is fixedly connected to a first end and an eyepiece assembly is fixedly connected to a second end, wherein the lens barrel is formed as a hollow cylinder and has a first central axis that coincides with the optical axis of the optical lens assembly;

[0007] Focusing assembly, the focusing assembly comprising:

[0008] A focusing frame is mounted on the optical lens assembly and adjusts the focal length of the optical lens assembly by moving it along the optical axis.

[0009] An adjustment knob is mounted on the outside of the lens barrel and connected to the focusing frame via a connecting rod. The adjustment knob rotates around the first central axis or a second central axis perpendicular to the first central axis, thereby driving the focusing frame to move along the optical axis via the connecting rod.

[0010] In one embodiment, the connecting rod is installed inside the lens barrel and is parallel to the first central axis;

[0011] The adjustment knob is located adjacent to the eyepiece assembly.

[0012] In one embodiment, the first end of the connecting rod is housed in a ball head in a spherical groove at the top of the focusing frame;

[0013] The ball head at least partially protrudes from the top of the focusing frame, and the ball head is confined within the spherical groove by a ball head pressure plate.

[0014] In one embodiment, the optical lens assembly includes:

[0015] A lens housing, wherein the lens housing is formed as a hollow cylinder, and the lens housing is coaxial with the lens barrel;

[0016] An optical lens assembly, wherein the optical lens assembly is mounted on the front end of the lens housing;

[0017] A detector, which is mounted at the rear end of the lens housing;

[0018] The focusing frame is installed inside the lens housing and has an outer peripheral surface that slides with the inner wall of the lens housing. The focusing frame has a connecting part that penetrates the detector and extends into the lens barrel, and the connecting rod is connected to the connecting part.

[0019] In one embodiment, the adjustment knob is formed as a cylindrical handwheel sleeved on the outer surface of the lens barrel, and the adjustment knob is limited to having only rotational freedom about the first central axis relative to the lens barrel;

[0020] The focusing component includes:

[0021] The first slider is mounted on the lens barrel and is threadedly engaged with the inner surface of the adjustment knob. The first slider is fixedly connected to the connecting rod.

[0022] The first slider is limited to having only a linear degree of freedom to move along the extension direction of the optical axis relative to the lens barrel.

[0023] In one embodiment, the adjustment knob is formed as an arc-shaped handwheel sleeved on the outer surface of the lens barrel, and the adjustment knob is limited to having only rotational freedom about the first central axis relative to the lens barrel;

[0024] The focusing component includes:

[0025] The second straight groove is formed in the lens barrel and extends along a direction parallel to the first central axis;

[0026] The second curved groove is formed on the inner surface of the adjustment knob and forms an angle with the cross-sectional direction of the lens barrel;

[0027] The second sliding pin passes through both the second straight groove and the second curved groove, and is fixedly connected to the connecting rod.

[0028] The rotation of the adjustment knob around the first central axis drives the second sliding pin to move linearly along the second straight groove, thereby driving the focusing frame to move along the optical axis via the connecting rod.

[0029] In one embodiment, the focusing component includes:

[0030] The second drive plate is fixed to the inner surface of the adjustment knob and is formed as an arc-shaped plate with the same radius as the adjustment knob. The second curved groove is formed on the second drive plate.

[0031] In one embodiment, the adjustment knob is mounted on the top of the lens barrel and rotates about the second central axis;

[0032] The focusing component includes:

[0033] The third sliding pin is fixedly connected between the adjusting knob and the connecting rod, and is offset from the second central axis;

[0034] A third curved groove is formed in the lens barrel and extends in a plane perpendicular to the second central axis, the third curved groove at least partially surrounding the second central axis;

[0035] The rotation of the adjustment knob around the second central axis drives the third sliding pin to move along the third curved groove, thereby driving the focusing frame to move along the optical axis via the connecting rod.

[0036] In one embodiment, the inner surface of the lens barrel has a support groove, the second end of the connecting rod is supported in the support groove, and the support groove extends along the first central axis.

[0037] In one embodiment, the first end of the connecting rod is threadedly connected to the focusing frame, the connecting rod is limited to drive the focusing frame to move along the optical axis by rotation about the first central axis, and the connecting rod is immovable in the direction of the first central axis.

[0038] In one embodiment, the adjustment knob is mounted on the top of the lens barrel and rotates about the second central axis;

[0039] The focusing component includes:

[0040] A fourth bevel gear is mounted on the top of the lens barrel and rotates synchronously with the adjustment knob around the second central axis;

[0041] The fifth bevel gear is mounted on the second end of the connecting rod and meshes with the fourth bevel gear;

[0042] The rotation of the adjustment knob around the second central axis drives the connecting rod to rotate around the first central axis via the fourth and fifth bevel gears, thereby moving the focusing frame along the optical axis.

[0043] In this example, the adjustment knob 30 is mounted on the outside of the lens barrel 10, preferably close to the outer surface of the lens barrel 10. The adjustment knob 30 can be adjusted in different ways, such as rotating around a first central axis L1 or rotating around a second central axis L2 perpendicular to the first central axis L1. When the adjustment knob 30 is positioned close to the outer surface of the lens barrel 10, the impact of the adjustment knob on the overall size of the lens assembly can be disregarded, thus achieving the goal of enlarging the adjustment knob. By increasing the size of the adjustment knob 30, user adjustment becomes more convenient, and even in situations where operation is inconvenient, such as when wearing gloves, accidental operation can be avoided. Attached Figure Description

[0044] The following figures are for illustrative purposes only and do not limit the scope of this application.

[0045] Figure 1 and Figure 2 This is a cross-sectional schematic diagram and an exploded view of a first embodiment of the focal length adjustable lens device of this application.

[0046] Figure 3 and Figure 4 This is a cross-sectional schematic diagram and an exploded view of a second embodiment of the focal length adjustable lens device of this application.

[0047] Figure 5 and Figure 6 This is a cross-sectional schematic diagram and an exploded view of a third embodiment of the focal length adjustable lens device of this application.

[0048] Figure 7 and Figure 8 This is a cross-sectional schematic diagram and an exploded view of a fourth embodiment of the focal length adjustable lens device of this application. Detailed Implementation

[0049] To provide a clearer understanding of the technical features, objectives, and effects of the invention, specific embodiments of the invention are now described with reference to the accompanying drawings, in which the same reference numerals denote the same parts.

[0050] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0051] To keep the drawings concise, only the parts relevant to the invention are shown in each figure, and do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of the components with the same structure or function is shown schematically, or only one is labeled.

[0052] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0053] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0054] In this document, terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0055] The embodiments of this application provide a focal length adjustable lens device, wherein the adjustment knob for adjusting the lens focal length is disposed on the outer surface of the lens barrel, and can be adjusted by different rotation methods, which has the characteristics of convenient operation.

[0056] The exemplary embodiments will now be described more fully with reference to the accompanying drawings.

[0057] First Embodiment

[0058] like Figure 1 and Figure 2 As shown, one embodiment of this application provides a focal length adjustable lens device, including:

[0059] The lens barrel 10 has an optical lens assembly 1 fixedly connected to its first end and an eyepiece assembly 2 fixedly connected to its second end. The lens barrel 10 is formed as a hollow cylinder and has a first central axis L1 that coincides with the optical axis of the optical lens assembly 1.

[0060] Focusing assembly 20, which includes:

[0061] Focusing frame 21 is mounted on optical lens assembly 1 and adjusts the focal length of optical lens assembly 1 by moving along the optical axis.

[0062] An adjustment knob 30 is mounted on the outside of the lens barrel 10 and connected to the focusing frame 21 via a connecting rod 22. The adjustment knob 30 rotates around the first central axis L1 or the second central axis L2 perpendicular to the first central axis L1, so as to drive the focusing frame 21 to move along the optical axis via the connecting rod 22.

[0063] A focusing mechanism is a device on a camera or lens used to adjust the distance between the lens and the film to ensure a sharp image. It typically includes mechanical parts, sensors, and drive mechanisms to precisely control the lens's focal length.

[0064] In this example, the focusing frame 21 serves as a structure for adjusting the focal length position of the optical lens assembly 1. It is located inside the optical lens assembly 1. The focal length of the optical lens assembly 1 can be adjusted by adjusting the distance between the focusing frame 21 and the lens in the optical axis direction of the optical lens assembly 1.

[0065] The first end of the lens barrel 10 is fixedly connected to the optical lens assembly 1. Normally, the lens barrel 10 is cylindrical, and the first central axis L1 of the lens barrel 10 coincides with the optical axis of the optical lens assembly 1.

[0066] In this example, the adjustment knob 30 is mounted on the outside of the lens barrel 10, preferably close to the outer surface of the lens barrel 10. The adjustment knob 30 can be adjusted in different ways, such as rotating around a first central axis L1 or rotating around a second central axis L2 perpendicular to the first central axis L1. When the adjustment knob 30 is positioned close to the outer surface of the lens barrel 10, the impact of the adjustment knob on the overall size of the lens assembly can be disregarded, thus achieving the goal of enlarging the adjustment knob. By increasing the size of the adjustment knob 30, user adjustment becomes more convenient, and even in situations where operation is inconvenient, such as when wearing gloves, accidental operation can be avoided.

[0067] The focusing assembly includes a focusing frame 21 located within the optical lens assembly 1, an adjustment knob 30 mounted on the outside of the lens barrel 10, and a connecting rod 22 connecting the focusing frame 21 and the adjustment knob 30.

[0068] In one example, the connecting rod 22 is installed inside the lens barrel 10 and parallel to the first central axis L1, and the adjusting knob 30 is adjacent to the eyepiece assembly 2.

[0069] Link 22 extends along a direction parallel to the first central axis L1. In this document, the first central axis L1 may not specifically refer to the direction that coincides with the optical axis of the optical lens assembly 1, but rather to multiple directions that are parallel to the optical axis of the optical lens assembly 1.

[0070] The focusing frame 21 is located at the first end of the lens barrel 10, and the adjustment knob 30 is adjacent to the second end of the lens barrel 10. A connecting rod 22 extends along the first central axis L1 to connect the focusing frame 21 and the adjustment knob 30. The movement of the connecting rod 22 is not unique. For example, the connecting rod 22 can move directly along the first central axis L1 by moving along the direction of the first central axis L1. Alternatively, the connecting rod 22 can move the focusing frame 21 along the first central axis L1 by rotating about the first central axis L1.

[0071] In a specific example, the first end of the connecting rod 22 is housed in the ball head 221 in the spherical groove 211 at the top of the focusing frame 21;

[0072] The ball head 221 protrudes at least partially from the top of the focusing frame 21, and is confined within the spherical groove 211 by the ball head pressure plate 23.

[0073] In this example, the connecting rod 22 is directly connected to the focusing frame 21 via the ball joint 221. Therefore, by moving along the first central axis L1, the connecting rod 22 directly drives the focusing frame 21 to move along the first central axis L1. The ball joint 221 connecting the connecting rod 22 and the focusing frame 21 allows the ball joint 221 to have the freedom of rotational adjustment within the spherical groove 211, thereby effectively eliminating deviations caused by parts processing and assembly, and preventing the focusing activity from jamming due to locking.

[0074] The tightness of the fit between the ball head 221 and the spherical groove 211 is controlled by the tightness of the connection between the ball head pressure plate 23 and the focusing frame 21.

[0075] Specifically, the optical lens assembly 1 includes:

[0076] Lens housing 1a is formed as a hollow cylinder and is coaxial with lens barrel 10;

[0077] Optical lens assembly 1b is mounted on the front end of lens housing 1a;

[0078] Detector 1c is installed at the rear end of lens housing 1a;

[0079] The focusing frame 21 is installed inside the lens housing 1a and has an outer peripheral surface that slides with the inner wall of the lens housing 1a. The focusing frame 21 has a connecting part that penetrates the detector 1c and extends into the lens barrel 10. The connecting rod 22 is connected to the connecting part.

[0080] The primary function of the optical lens is to collect light and focus it onto the detector to form a clear image. The detector then converts the focused light into electrical signals for further processing and analysis. In this example, the focusing frame 21 is mounted inside the lens housing 1a, and the detector 1c is located at the rear end of the lens housing 1a. The focusing frame 21 has a connecting portion extending from the lens housing 1a into the lens barrel 10, and this connecting portion has a spherical groove 211.

[0081] In such Figure 1 and Figure 2 In the embodiment shown, the adjustment knob 30 is formed as a cylindrical handwheel sleeved on the outer surface of the lens barrel 10, and the adjustment knob 30 is limited to having only a rotational degree of freedom to rotate about the first central axis L1 relative to the lens barrel 10.

[0082] Correspondingly, the focusing assembly 20 includes:

[0083] The first slider 24 is mounted on the lens barrel 10 and is threaded to the inner surface of the adjusting knob 30. The first slider 24 is fixedly connected to the connecting rod 22.

[0084] The first slider 24 is limited to having only a linear degree of freedom to move along the extension direction of the optical axis relative to the lens barrel 10.

[0085] In this example, the adjustment knob 30 is sleeved on the outer surface of the lens barrel 10. For example, the outer surface of the lens barrel 10 has an annular groove, and the adjustment knob 30 is placed in the annular groove. By matching the size of the annular groove with the adjustment knob 30, the adjustment knob 30 is limited to having only a rotational degree of freedom about the first central axis L1 relative to the lens barrel 10, and no translational degree of freedom in the extension direction of the first central axis L.

[0086] Since the linkage 22 moves along the direction of the first central axis L1, and the adjustment knob 30 rotates around the first central axis L1, the focusing assembly 20 includes a first slider 24, which converts the rotation of the adjustment knob 30 into linear movement.

[0087] like Figure 1 and Figure 2As shown, the first slider 24 is mounted on the lens barrel 10 and fits against the inner surface of the adjustment knob 30. The first slider 24 is threadedly engaged with the adjustment knob 30 via a thread on its top, and is fixedly connected to the connecting rod 22 by fasteners. The first slider 24 is limited by the connecting rod 22 and the lens barrel 10 to have only one degree of freedom: linear movement along the first central axis L1. Rotation of the adjustment knob 30, through the threaded engagement, drives the first slider 24 to move linearly along the first central axis L1, thereby causing the connecting rod 22 to move linearly along the first central axis L1 as well, and further driving the focusing frame 21 to move linearly along the first central axis L1.

[0088] The adjustment precision of the focusing frame 21 can be adjusted by the gear ratio of the adjusting knob 30 and the first slider 24. For example, when the gear ratio of the adjusting knob 30 and the first slider 24 increases, the adjustment precision of the focusing frame 21 will increase, and the movement distance of the focusing frame 21 will decrease with each rotation of the adjusting knob 30. When the gear ratio of the adjusting knob 30 and the first slider 24 decreases, the adjustment precision of the focusing frame 21 will decrease, and the movement distance of the focusing frame 21 will increase with each rotation of the adjusting knob 30.

[0089] In this example, the diameter of the adjustment knob 30 can be enlarged to match that of the lens barrel 10, and the depth of the annular groove can be set to be slightly less than the thickness of the adjustment knob 30. This causes the adjustment knob 30 to slightly protrude from the surface of the lens barrel 10, improving user convenience. In this example, the size of the adjustment knob 30 can be essentially maximized.

[0090] The surface of the adjustment knob 30 may be provided with operating threads, for example, to improve ease of operation by increasing surface roughness.

[0091] Second Embodiment

[0092] like Figure 3 and Figure 4 As shown, one embodiment of this application provides a focal length adjustable lens device, including:

[0093] The lens barrel 10 has an optical lens assembly 1 fixedly connected to its first end and an eyepiece assembly 2 fixedly connected to its second end. The lens barrel 10 is formed as a hollow cylinder and has a first central axis L1 that coincides with the optical axis of the optical lens assembly 1.

[0094] Focusing assembly 20, which includes:

[0095] Focusing frame 21 is mounted on optical lens assembly 1 and adjusts the focal length of optical lens assembly 1 by moving along the optical axis.

[0096] An adjustment knob 30 is mounted on the outside of the lens barrel 10 and connected to the focusing frame 21 via a connecting rod 22. The adjustment knob 30 rotates around the first central axis L1 or the second central axis L2 perpendicular to the first central axis L1, so as to drive the focusing frame 21 to move along the optical axis via the connecting rod 22.

[0097] In this example, the first end of the connecting rod 22 is housed in the ball head 221 in the spherical groove 211 at the top of the focusing frame 21;

[0098] The ball head 221 protrudes at least partially from the top of the focusing frame 21, and is confined within the spherical groove 211 by the ball head pressure plate 23.

[0099] In this example, the connecting rod 22 is directly connected to the focusing frame 21 via the ball joint 221. Therefore, by moving along the first central axis L1, the connecting rod 22 directly drives the focusing frame 21 to move along the first central axis L1. The ball joint 221 connecting the connecting rod 22 and the focusing frame 21 allows the ball joint 221 to have the freedom of rotational adjustment within the spherical groove 211, thereby effectively eliminating deviations caused by parts processing and assembly, and preventing the focusing activity from jamming due to locking.

[0100] The adjustment knob 30 is formed as a circumferential handwheel sleeved on the outer surface of the lens barrel 10. The adjustment knob 30 is limited to having only rotational freedom around the first central axis L1 relative to the lens barrel 10.

[0101] In this example, the adjustment knob 30 has a similar structure to that of the first embodiment, and is limited to having only a rotational degree of freedom about the first central axis L1 relative to the lens barrel 10. For ease of operation, the surface of the adjustment knob 30 in this example may have a protruding paddle, so that the user can easily rotate the adjustment knob 30 by pushing or pulling.

[0102] Correspondingly, the focusing assembly 20 includes:

[0103] The second straight groove 261 is formed in the lens barrel 10 and extends along a direction parallel to the first central axis L1.

[0104] The second curved groove 262 is formed on the inner surface of the adjustment knob 30 and forms an angle with the cross-sectional direction of the lens barrel 10.

[0105] The second sliding pin 25 passes through both the second straight groove 261 and the second curved groove 262, and is fixedly connected to the connecting rod 22.

[0106] The rotation of the adjustment knob 30 around the first central axis L1 drives the second sliding pin 25 to move linearly along the second straight groove 261, thereby driving the focusing frame 21 to move along the optical axis via the connecting rod 22.

[0107] The adjustment knob 30 is limited to having only rotational freedom about the first central axis L1 relative to the lens barrel 10, but no translational freedom in the direction of extension of the first central axis L.

[0108] Since the linkage 22 moves along the direction of the first central axis L1, and the adjustment knob 30 rotates around the first central axis L1, the focusing assembly 20 includes a conversion device that converts the rotation of the adjustment knob 30 into linear movement—a second linear groove 261 and a second curved groove 262.

[0109] The second curved groove 262 is formed on the inner surface of the adjustment knob 30, the second straight groove 261 is formed on the lens barrel 10, and the second sliding pin 25 is connected between the adjustment knob 30 and the connecting rod 22. The rotation of the adjustment knob 30 is converted into linear movement by simultaneously passing through the second straight groove 261 and the second curved groove 262.

[0110] The second curved groove 262 extends generally along the circumferential direction of the lens barrel 10, but forms an angle with the cross-sectional direction of the lens barrel 10. The rotation of the adjustment knob 30 around the first central axis L1 drives the second sliding pin 25 to be adjusted by the second curved groove 262 and the second straight groove 261 to move linearly along the second straight groove 261. The second sliding pin 25 is fixedly connected to the connecting rod 22, thereby driving the connecting rod 22 to move linearly along the first central axis L1, so as to drive the focusing frame 21 to move along the optical axis.

[0111] In a specific example, the focusing component 20 includes:

[0112] The second drive plate 263 is fixed to the inner surface of the adjustment knob 30 and is formed as an arc plate with the same radius as the adjustment knob 30. The second curved groove 262 is formed on the second drive plate 263.

[0113] In a specific example, the adjustment knob 30 is fitted onto the outer surface of the lens barrel 10. For example, the outer surface of the lens barrel 10 has an annular groove, and the adjustment knob 30 is placed in the annular groove. By matching the size of the annular groove with the adjustment knob 30, the adjustment knob 30 is limited to having only a rotational degree of freedom about the first central axis L1 relative to the lens barrel 10, and no translational degree of freedom in the extension direction of the first central axis L.

[0114] The second drive plate 263 is pressed into the annular groove by the adjustment knob 30, so as to be limited between the adjustment knob 30 and the lens barrel 10. Optionally, the second drive plate 263 may have a limiting mechanism that is positioned above the adjustment knob 30 in the circumferential direction, so that when the adjustment knob 30 rotates around the first central axis L1, the second drive plate 263 can be driven to rotate synchronously with the adjustment knob 30 around the first central axis L1.

[0115] Third Embodiment

[0116] like Figure 5 and Figure 6 As shown, one embodiment of this application provides a focal length adjustable lens device, including:

[0117] The lens barrel 10 has an optical lens assembly 1 fixedly connected to its first end and an eyepiece assembly 2 fixedly connected to its second end. The lens barrel 10 is formed as a hollow cylinder and has a first central axis L1 that coincides with the optical axis of the optical lens assembly 1.

[0118] Focusing assembly 20, which includes:

[0119] Focusing frame 21 is mounted on optical lens assembly 1 and adjusts the focal length of optical lens assembly 1 by moving along the optical axis.

[0120] An adjustment knob 30 is mounted on the outside of the lens barrel 10 and connected to the focusing frame 21 via a connecting rod 22. The adjustment knob 30 rotates around the first central axis L1 or the second central axis L2 perpendicular to the first central axis L1, so as to drive the focusing frame 21 to move along the optical axis via the connecting rod 22.

[0121] The focusing assembly includes a focusing frame 21 located within the optical lens assembly 1, an adjustment knob 30 mounted on the outside of the lens barrel 10, and a connecting rod 22 connecting the focusing frame 21 and the adjustment knob 30.

[0122] In this example, the connecting rod 22 is installed inside the lens barrel 10 and is parallel to the first central axis L1, and the adjusting knob 30 is adjacent to the eyepiece assembly 2.

[0123] Link 22 extends along a direction parallel to the first central axis L1. In this document, the first central axis L1 may not specifically refer to the direction that coincides with the optical axis of the optical lens assembly 1, but rather to multiple directions that are parallel to the optical axis of the optical lens assembly 1.

[0124] The focusing frame 21 is located at the first end of the lens barrel 10, and the adjustment knob 30 is adjacent to the second end of the lens barrel 10. A connecting rod 22 extends along the first central axis L1 to connect the focusing frame 21 and the adjustment knob 30. The movement of the connecting rod 22 is not unique. For example, the connecting rod 22 can move directly along the first central axis L1 by moving along the direction of the first central axis L1. Alternatively, the connecting rod 22 can move the focusing frame 21 along the first central axis L1 by rotating about the first central axis L1.

[0125] In a specific example, the first end of the connecting rod 22 is housed in the ball head 221 in the spherical groove 211 at the top of the focusing frame 21;

[0126] The ball head 221 protrudes at least partially from the top of the focusing frame 21, and is confined within the spherical groove 211 by the ball head pressure plate 23.

[0127] In this example, the connecting rod 22 is directly connected to the focusing frame 21 via the ball joint 221. Therefore, by moving along the first central axis L1, the connecting rod 22 directly drives the focusing frame 21 to move along the first central axis L1. The ball joint 221 connecting the connecting rod 22 and the focusing frame 21 allows the ball joint 221 to have the freedom of rotational adjustment within the spherical groove 211, thereby effectively eliminating deviations caused by parts processing and assembly, and preventing the focusing activity from jamming due to locking.

[0128] In this example, the adjustment knob 30 is mounted on the top of the lens barrel 10 and rotates around the second central axis L2. In one specific example, the direction of the second central axis L2 is vertical.

[0129] Since the linkage 22 moves along the first central axis L1, and the adjustment knob 30 rotates around the second central axis L2, the focusing assembly 20 includes a third curved groove 281, which converts the rotation of the adjustment knob 30 into linear movement.

[0130] In a specific example, the focusing component 20 includes:

[0131] The third sliding pin 27 is fixedly connected between the adjusting knob 30 and the connecting rod 22, and is offset from the second central axis L2;

[0132] The third curved groove 281 is formed in the lens barrel 10 and extends in a plane perpendicular to the second central axis L2. The third curved groove 281 at least partially surrounds the second central axis L2.

[0133] The rotation of the adjustment knob 30 around the second central axis L2 drives the third sliding pin 27 to move along the third curved groove 281, thereby driving the focusing frame 21 to move along the optical axis via the connecting rod 22.

[0134] The central axis of the adjusting knob 30 is the second central axis L2. The adjusting knob 30 and the third sliding pin 27 are fixedly connected, and the third sliding pin 27 is offset from the second central axis L2, so that the rotation of the adjusting knob 30 can drive the third sliding pin 27 to be displaced in the direction of the first central axis L1.

[0135] In one specific example, the inner surface of the lens barrel 10 has a support groove 11, and the second end of the connecting rod 22 is supported in the support groove 11, which extends along the first central axis L1.

[0136] The movement direction of the connecting rod 22 is limited to the first central axis L1 by the support groove 11. The support groove 11 cooperates with the third curved groove 281. The third sliding pin 27 passes through the third curved groove 281 and the connecting rod 22 at the same time, thereby converting the rotation of the adjustment knob 30 around the second central axis L2 into the linear movement of the connecting rod 22 along the first central axis L1.

[0137] The adjustment knob 30 is located at the top of the lens barrel 10, and its central axis is the second central axis L2. The maximum diameter of the adjustment knob 30 can also be enlarged to be equal to the diameter of the lens barrel 10. By increasing the size of the adjustment knob 30, it is easier for the user to adjust it, and even in situations where it is inconvenient to operate, such as wearing gloves, it can prevent accidental operation.

[0138] Fourth embodiment

[0139] like Figure 7 and Figure 8 As shown, one embodiment of this application provides a focal length adjustable lens device, including:

[0140] The lens barrel 10 has an optical lens assembly 1 fixedly connected to its first end and an eyepiece assembly 2 fixedly connected to its second end. The lens barrel 10 is formed as a hollow cylinder and has a first central axis L1 that coincides with the optical axis of the optical lens assembly 1.

[0141] Focusing assembly 20, which includes:

[0142] Focusing frame 21 is mounted on optical lens assembly 1 and adjusts the focal length of optical lens assembly 1 by moving along the optical axis.

[0143] An adjustment knob 30 is mounted on the outside of the lens barrel 10 and connected to the focusing frame 21 via a connecting rod 22. The adjustment knob 30 rotates around the first central axis L1 or the second central axis L2 perpendicular to the first central axis L1, so as to drive the focusing frame 21 to move along the optical axis via the connecting rod 22.

[0144] The focusing assembly includes a focusing frame 21 located within the optical lens assembly 1, an adjustment knob 30 mounted on the outside of the lens barrel 10, and a connecting rod 22 connecting the focusing frame 21 and the adjustment knob 30.

[0145] In this example, the connecting rod 22 is installed inside the lens barrel 10 and is parallel to the first central axis L1, and the adjusting knob 30 is adjacent to the eyepiece assembly 2.

[0146] Link 22 extends along a direction parallel to the first central axis L1. In this document, the first central axis L1 may not specifically refer to the direction that coincides with the optical axis of the optical lens assembly 1, but rather to multiple directions that are parallel to the optical axis of the optical lens assembly 1.

[0147] In this example, the first end of the connecting rod 22 is threadedly connected to the focusing frame 21. The connecting rod 22 is limited to drive the focusing frame 21 to move along the optical axis by rotating about the first central axis L1, and the connecting rod 22 is not movable in the direction of the first central axis L1.

[0148] Specifically, the connecting rod 22 passes through the detector 1c and is threadedly connected to the focusing frame 21. Since the connecting rod 22 is limited in the direction of the first central axis L1, it only has rotational freedom around the first central axis L1. Because the focusing frame 21 is limited to having only the degree of freedom to move along the first central axis L1, the threaded connection drives the focusing frame 21 to move along the first central axis L1.

[0149] In this example, the adjustment knob 30 is mounted on the top of the lens barrel 10 and rotates around the second central axis L2. In one specific example, the direction of the second central axis L2 is vertical.

[0150] Since the linkage 22 moves by rotating around the first central axis L1, and the adjustment knob 30 adjusts by rotating around the second central axis L2, the focusing assembly 20 includes a switching device for the rotation direction of the adjustment knob 30—a fourth bevel gear 28 and a fifth bevel gear 29.

[0151] Focusing assembly 20 includes:

[0152] The fourth bevel gear 28 is mounted on the top of the lens barrel 10 and rotates synchronously with the adjustment knob 30 around the second central axis L2.

[0153] The fifth bevel gear 29 is mounted on the second end of the connecting rod 22 and meshes with the fourth bevel gear 28;

[0154] The rotation of the adjustment knob 30 around the second central axis L2 drives the connecting rod 22 to rotate around the first central axis L1 via the fourth bevel gear 28 and the fifth bevel gear 29, thereby driving the focusing frame 21 to move along the optical axis.

[0155] The central axis of the fourth bevel gear 28 is along the direction of the second central axis L2, and the central axis of the fifth bevel gear 29 is along the direction of the first central axis L2. The fourth bevel gear 28 and the fifth bevel gear 29 mesh with each other in a mutually perpendicular manner, thereby changing the direction of rotation by 90°. This converts the rotation of the adjusting knob 30 around the second central axis L2 into the rotation of the connecting rod 22 around the first central axis L1.

[0156] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A lens device with adjustable focal length, characterized in that, include: The lens barrel (10) is fixedly connected to an optical lens assembly (1) at its first end and to an eyepiece assembly (2) at its second end. The lens barrel (10) is formed as a hollow cylinder and has a first central axis (L1) that coincides with the optical axis of the optical lens assembly (1). Focusing assembly (20), the focusing assembly (20) includes: A focusing frame (21) is mounted on the optical lens assembly (1) and the focal length of the optical lens assembly (1) is adjusted by moving along the optical axis. An adjustment knob (30) is mounted on the outside of the lens barrel (10) and connected to the focusing frame (21) via a connecting rod (22). The adjustment knob (30) rotates around the first central axis (L1) or a second central axis (L2) perpendicular to the first central axis (L1) to drive the focusing frame (21) to move along the optical axis via the connecting rod (22).

2. The focal length adjustable lens device according to claim 1, characterized in that, The connecting rod (22) is installed inside the lens barrel (10) and is parallel to the first central axis (L1). The adjustment knob (30) is adjacent to the eyepiece assembly (2).

3. The focal length adjustable lens device according to claim 1 or 2, characterized in that, The first end of the connecting rod (22) is housed in the ball head (221) in the spherical groove (211) at the top of the focusing frame (21). The ball head (221) protrudes at least partially from the top of the focusing frame (21), and the ball head (221) is confined within the spherical groove (211) by means of the ball head pressure plate (23).

4. The focal length adjustable lens device according to claim 3, characterized in that, The optical lens assembly (1) includes: Lens housing (1a), the lens housing (1a) is formed as a hollow cylinder, the lens housing (1a) and the lens barrel (10) are coaxial; An optical lens assembly (1b) is mounted on the front end of the lens housing (1a); A detector (1c) is mounted at the rear end of the lens housing (1a); The focusing frame (21) is installed inside the lens housing (1a) and has an outer peripheral surface that slides with the inner wall of the lens housing (1a). The focusing frame (21) has a connecting part that penetrates the detector (1c) and extends into the lens barrel (10). The connecting rod (22) is connected to the connecting part.

5. The focal length adjustable lens device according to claim 3, characterized in that, The adjustment knob (30) is formed as a cylindrical handwheel sleeved on the outer surface of the lens barrel (10). The adjustment knob (30) is limited to having only rotational freedom about the first central axis (L1) relative to the lens barrel (10). The focusing assembly (20) includes: The first slider (24) is mounted on the lens barrel (10) and is threadedly engaged with the inner surface of the adjustment knob (30). The first slider (24) is fixedly connected to the connecting rod (22). The first slider (24) is limited to having only a degree of freedom to move linearly along the extension direction of the optical axis relative to the lens barrel (10).

6. The focal length adjustable lens device according to claim 3, characterized in that, The adjustment knob (30) is formed as an arc-shaped handwheel sleeved on the outer surface of the lens barrel (10). The adjustment knob (30) is limited to having only rotational freedom about the first central axis (L1) relative to the lens barrel (10). The focusing assembly (20) includes: A second straight groove (261) is formed in the lens barrel (10) and extends in a direction parallel to the first central axis (L1); The second curved groove (262) is formed on the inner surface of the adjustment knob (30) and forms an angle with the cross-sectional direction of the lens barrel (10); The second sliding pin (25) passes through both the second straight groove (261) and the second curved groove (262) and is fixedly connected to the connecting rod (22); The adjustment knob (30) rotates around the first central axis (L1) to drive the second sliding pin (25) to move linearly along the second straight groove (261) so as to drive the focusing frame (21) to move along the optical axis via the connecting rod (22).

7. The focal length adjustable lens device according to claim 6, characterized in that, The focusing assembly (20) includes: The second drive plate (263) is fixed to the inner surface of the adjustment knob (30) and is formed as an arc plate with the same radius as the adjustment knob (30). The second curved groove (262) is opened on the second drive plate (263).

8. The focal length adjustable lens device according to claim 3, characterized in that, The adjustment knob (30) is mounted on the top of the lens barrel (10) and rotates around the second central axis (L2); The focusing assembly (20) includes: The third sliding pin (27) is fixedly connected between the adjusting knob (30) and the connecting rod (22) and is offset from the second central axis (L2). A third curved groove (281) is formed in the lens barrel (10) and extends in a plane perpendicular to the second central axis (L2). The third curved groove (281) at least partially surrounds the second central axis (L2). The adjustment knob (30) rotates around the second central axis (L2) to drive the third sliding pin (27) to move along the third curved groove (281) so as to drive the focusing frame (21) to move along the optical axis via the connecting rod (22).

9. The focal length adjustable lens device according to claim 6 or 8, characterized in that, The inner surface of the lens barrel (10) has a support groove (11), and the second end of the connecting rod (22) is supported on the support groove (11), which extends along the first central axis (L1).

10. The focal length adjustable lens device according to claim 1 or 2, characterized in that, The first end of the connecting rod (22) is threadedly connected to the focusing frame (21). The connecting rod (22) is limited to drive the focusing frame (21) to move along the optical axis by rotating about the first central axis (L1), and the connecting rod (22) is immovable in the direction of the first central axis (L1).

11. The focal length adjustable lens device according to claim 10, characterized in that, The adjustment knob (30) is mounted on the top of the lens barrel (10) and rotates around the second central axis (L2); The focusing assembly (20) includes: The fourth bevel gear (28) is mounted on the top of the lens barrel (10) and rotates synchronously with the adjustment knob (30) around the second central axis (L2); The fifth bevel gear (29) is mounted on the second end of the connecting rod (22) and meshes with the fourth bevel gear (28); The adjustment knob (30) rotates around the second central axis (L2) via the fourth bevel gear (28) and the fifth bevel gear (29) to drive the connecting rod (22) to rotate around the first central axis (L1), thereby driving the focusing frame (21) to move along the optical axis.

Images