An optical lens

Abstract

The present invention belongs to the technical field of lenses, and specifically relates to an optical lens, including an optical device and a mechanical device, wherein the optical device includes a front lens group and a rear lens group arranged from the object side to the image side, and the mechanical device includes a lens barrel, a fixed barrel and an adapter ring which are sequentially sleeved on the lens barrel, wherein the front lens group is installed in the lens barrel, and the rear lens group is installed in the end of the fixed barrel, a guide pin is fixed to the side of the lens barrel, the fixed barrel is provided with a waist groove matched with the guide pin, and the adapter ring is provided with a curved groove matched with the guide pin, and the curved groove drives the guide pin to move forward and backward along the direction of the waist groove, so as to change the distance between the front lens group and the rear lens group. The present invention can adjust the distance between the front lens group and the rear lens group, realize focusing of the lens, and help improve the imaging quality of the lens.

Description

Technical Field

[0001] The present invention belongs to the technical field of lenses, and in particular relates to an optical lens. Background Art

[0002] With the implementation of the Made in China 2025 strategy and the rapid development of industrial automation, machine vision has been widely used in manufacturing, quality inspection, logistics, medicine, scientific research, and other fields. It measures, judges, and detects defects in target parts, reducing or eliminating human errors and improving measurement accuracy and stability. Lenses, as the "eyes" of machine vision, play a crucial role. Applications in electronic product manufacturing, such as LCD screen defect detection and mobile phone touch screen circuits, place increasingly stringent demands on lenses.

[0003] However, the inventors have discovered that the existing solution still has at least the following defects: when focusing the existing lens, the front lens group and the rear lens group can only move simultaneously, and the distance between the front lens group and the rear lens group is fixed, which affects the image quality. Summary of the Invention

[0004] The purpose of the present invention is to provide an optical lens that can adjust the distance between the front lens group and the rear lens group to achieve focusing of the lens, thereby helping to improve the imaging quality of the lens.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An optical lens comprises an optical device and a mechanical device, wherein the optical device comprises a front lens group and a rear lens group arranged from the object side to the image side, and the mechanical device comprises a lens barrel, a fixed barrel and an adapter ring sequentially sleeved on the lens barrel, the front lens group is mounted in the lens barrel, and the rear lens group is mounted in the end of the fixed barrel, a guide pin is fixed to the side of the lens barrel, the fixed barrel is provided with a waist groove that cooperates with the guide pin, and the adapter ring is provided with a curved groove that cooperates with the guide pin, and the curved groove drives the guide pin to move back and forth along the direction of the waist groove, so as to change the distance between the front lens group and the rear lens group.

[0007] As an improvement of the optical lens described in the present invention, the front lens group includes a front pressure ring, a first lens, a first spacer, a second lens, a second spacer, a third lens, a third spacer, a first cemented lens, a fourth spacer, a second cemented lens, a variable aperture, a middle pressure ring and a third cemented lens, which are arranged in sequence along the optical axis. The first lens and the second lens are both meniscus lenses, the third lens is a bimenus lens, and the third cemented lens is fixed in the lens barrel through a middle lens seat.

[0008] As an improvement of the optical lens described in the present invention, the waist groove extends along the moving direction of the guide pin, and the curved groove is arranged around the side wall of the adapter ring.

[0009] As an improvement to the optical lens described in the present invention, a guide sleeve is installed at one end of the guide pin, and the other end of the guide pin passes through the waist groove and the curved groove in sequence and is installed on the lens barrel.

[0010] As an improvement to the optical lens described in the present invention, the waist groove forms a straight hole along the optical axis, and the curved groove forms a spiral channel along the optical axis.

[0011] As an improvement to the optical lens described in the present invention, an aperture lever is fixed to the side of the variable aperture, an aperture ring is fixed to the aperture lever, an adjustable light ring is connected to the end of the aperture lever, the adjustable light ring is sleeved on the fixed tube, and the adjustable light ring is fixed to the outside of the fixed tube by a locking pin.

[0012] As an improvement to the optical lens described in the present invention, a guide sleeve is installed at one end of the guide pin, and the other end of the guide pin is installed on the lens barrel.

[0013] As an improvement of the optical lens described in the present invention, the mechanical device further includes a focus ring, and the focus ring is fixed to the outer side of the adapter ring by a first screw.

[0014] As an improvement to the optical lens described in the present invention, a fixing ring is sleeved on the end of the focusing ring, and the fixing ring fixes the focusing ring via a locking pin.

[0015] As an improvement of the optical lens described in the present invention, the rear lens group includes a fourth lens, a fifth spacer ring, a fifth lens and a rear pressure ring arranged in sequence along the optical axis, the fourth lens is a biconvex lens, and the fifth lens is a bimenus lens.

[0016] As an improvement to the optical lens described in the present invention, the end of the fixing tube is sleeved with a bayonet, and the bayonet is fixed to the end of the fixing tube by a plurality of second screws.

[0017] The beneficial effect of the present invention is that the present invention includes an optical device and a mechanical device, the optical device includes a front lens group and a rear lens group arranged from the object side to the image side, the mechanical device includes a lens barrel, a fixed tube and an adapter ring sequentially mounted on the lens barrel, the front lens group is installed in the lens barrel, the rear lens group is installed in the end of the fixed tube, a guide pin is fixed to the side of the lens barrel, the fixed tube is provided with a waist groove that cooperates with the guide pin, and the adapter ring is provided with a curved groove that cooperates with the guide pin, the curved groove drives the guide pin to move back and forth along the direction of the waist groove, so as to change the distance between the front lens group and the rear lens group. Since the front lens group and the rear lens group can only move simultaneously when focusing the existing lens, the distance between the front lens group and the rear lens group is fixed, which affects the image quality. Therefore, an adapter ring is mounted on a fixed tube, which is mounted on the lens barrel so that the lens barrel is in the innermost layer, and a guide pin is fixed on the side of the lens barrel. The fixed tube is provided with a waist groove that cooperates with the guide pin, and the adapter ring is provided with a curved groove that cooperates with the guide pin. The guide pin passes through the waist groove and the curved groove in sequence. When the adapter ring rotates, the curved groove drives the guide pin, thereby driving the front lens group in the lens barrel to move. At the same time, the fixed tube located between the adapter ring and the lens barrel is provided with a waist groove to ensure that the guide pin on the lens barrel moves back and forth along the direction of the waist groove. That is, the rotational motion of the adapter ring is converted into the back and forth motion of the front lens group in the lens barrel relative to the rear lens group at the end of the fixed tube, thereby changing the distance between the front lens group and the rear lens group, realizing the focusing function, and thus improving the image quality of the lens. The present invention can adjust the distance between the front lens group and the rear lens group, realize focusing of the lens, and help improve the image quality of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0019] Figure 2 It is a cross-sectional schematic diagram of the lens barrel of the present invention.

[0020] Figure 3 It is a cross-sectional schematic diagram of the fixing cylinder of the present invention.

[0021] Figure 4 It is a schematic diagram of the decomposition of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the waist groove and curved groove of the present invention.

[0023] Among them: 1-lens barrel; 2-fixed barrel; 3-adapter ring; 4-waist groove; 5-curved groove; 101-first lens; 102-first spacer; 103-second lens; 104-second spacer; 105-third lens; 106-third spacer; 107-first cemented lens; 108-fourth spacer; 109-second cemented lens; 110-variable iris; 111-intermediate pressure ring; 112-third cemented lens Mirror; 113-middle lens holder; 114-aperture lever; 115-aperture ring; 116-front pressure ring; 201-fourth lens; 202-fifth spacer ring; 203-fifth lens; 204-rear pressure ring; 205-bayonet; 206-second screw; 301-guide pin; 302-guide sleeve; 303-focusing ring; 304-fixing ring; 305-aperture ring; 306-first screw; 307-locking pin. DETAILED DESCRIPTION

[0024] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are merely for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0026] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The following is combined with Figures 1 to 5 The present invention is described in further detail, but is not intended to limit the present invention.

[0028] Implementation Method

[0029] like Figures 1 to 4 As shown, an optical lens includes an optical device and a mechanical device. The optical device includes a front lens group and a rear lens group arranged from the object side to the image side. The mechanical device includes a lens barrel 1, a fixed barrel 2 and an adapter ring 3 that are sequentially mounted on the lens barrel 1. The front lens group is installed in the lens barrel 1, and the rear lens group is installed in the end of the fixed barrel 2. A guide pin 301 is fixed to the side of the lens barrel 1, the fixed barrel 2 is provided with a waist groove 4 that cooperates with the guide pin 301, and the adapter ring 3 is provided with a curved groove 5 that cooperates with the guide pin 301. The curved groove 5 drives the guide pin 301 to move back and forth along the direction of the waist groove 4, which is used to change the distance between the front lens group and the rear lens group. Since the front lens group and the rear lens group can only move at the same time when focusing, the distance between the front lens group and the rear lens group is fixed, which affects the image quality. Therefore, the adapter ring 3 is sleeved on the fixed tube 2, and the fixed tube 2 is sleeved on the lens barrel 1, so that the lens barrel 1 is in the innermost layer, and the guide pin 301 is fixed on the side of the lens barrel 1, the fixed tube 2 is provided with a waist groove 4 that matches the guide pin 301, and the adapter ring 3 is provided with a curved groove 5 that matches the guide pin 301. The guide pin 301 passes through the waist groove 4 and the curved groove 5 in sequence. When the adapter ring 3 rotates, the curved groove 5 drives the guide pin 301 from And drive the front lens group in the lens barrel 1 to move. At the same time, the fixed tube 2 located between the adapter ring 3 and the lens barrel 1 is provided with a waist groove 4 to ensure that the guide pin 301 on the lens barrel 1 moves back and forth along the direction of the waist groove 4, that is, the rotational movement of the adapter ring 3 is converted into the back and forth movement of the front lens group in the lens barrel 1 relative to the rear lens group at the end of the fixed tube 2, thereby changing the distance between the front lens group and the rear lens group to realize the focusing function, thereby improving the imaging quality of the lens. Among them, the waist groove 4 is a straight groove extending along the optical axis direction, ensuring that the curved groove 5 drives the front lens group in the lens barrel 1 to move back and forth.

[0030] like Figure 5 As shown, the waist groove 4 extends along the moving direction of the guide pin 301, and the curved groove 5 is arranged around the side wall of the adapter ring 3. The waist groove 4 forms a straight hole along the optical axis, and the curved groove 5 forms a spiral channel along the optical axis, which is used to convert the rotational motion of the adapter ring 3 into the linear motion of the guide pin 301, and the guide pin 301 drives the lens barrel 1 to move back and forth; the fixed tube 2 and the rear lens group form a cavity, and the lens barrel 1 is accommodated in the cavity. The cavity provides space for the lens barrel 1 to move back and forth. The inner diameter of the cavity is matched with the outer diameter of the lens barrel 1, which reduces the shaking of the lens barrel 1 in the fixed tube 2 and ensures that the front lens group in the lens barrel 1 moves along the optical axis.

[0031] One end of the guide pin 301 is mounted with a guide sleeve 302, and the other end of the guide pin 301 passes through the waist groove 4 and the curved groove 5 in sequence and is mounted on the lens barrel 1. The guide sleeve 302 can prevent the guide pin 301 from large displacement, which helps to improve the movement stability of the guide pin 301.

[0032] The front lens group includes a front pressure ring 116, a first lens 101, a first spacer 102, a second lens 103, a second spacer 104, a third lens 105, a third spacer 106, a first cemented lens 107, a fourth spacer 108, a second cemented lens 109, a variable aperture 110, an intermediate pressure ring 111, and a third cemented lens 112, which are arranged in sequence along the optical axis. The addition of the first cemented lens 107, the second cemented lens 109, and the third cemented lens 112 facilitates control of aberrations and chromatic aberrations in the optical system, thereby improving the imaging quality of the fixed-focus lens. However, the invention is not limited to this, and the order of the lenses can be adjusted according to actual imaging requirements to achieve better imaging results. Among them, the variable aperture 110 plays a limiting role on the light beam in the optical system. The user can adjust the position of the variable aperture 110 and the aperture size according to actual imaging requirements to achieve better imaging effects; the front pressure ring 116, the first spacer ring 102, the second spacer ring 104, the third spacer ring 106 and the fourth spacer ring 108 ensure that there is sufficient distance between the lenses, thereby improving the imaging effect of the optical system.

[0033] The first lens 101 and the second lens 103 are both meniscus lenses, the third lens 105 is a bimenus lens, and the third cemented lens 112 is fixed in the lens barrel 1 via the middle lens holder 113. The middle lens holder 113 ensures that there is sufficient distance between the lenses, thereby improving the imaging effect of the optical system.

[0034] An aperture lever 114 is fixed to the side of the variable aperture 110, an aperture ring 115 is fixed to the aperture lever 114, and a light adjustment ring 305 is connected to the end of the aperture lever 114. The light adjustment ring 305 is sleeved on the fixed tube 2 and fixed to the outside of the fixed tube 2 by a locking pin 307.

[0035] A plurality of guide pins 301 are arranged around the lens barrel 1 to ensure that the guide pins 301 in all directions of the lens barrel 1 can simultaneously drive the front lens group to move forward and backward, ensuring that the front lens group moves smoothly along the optical axis, which helps to improve the accuracy of lens adjustment.

[0036] The mechanical device also includes a focus ring 303, which is fixed to the outside of the adapter ring 3 via a first screw 306. The first screw 306 is used to secure the focus ring 303 and the adapter ring 3, thereby improving the stability between the focus ring 303 and the adapter ring 3. The first screw 306 is an M1.6 flat head screw.

[0037] A fixing ring 304 is sleeved on the end of the focus ring 303, which is secured to the focus ring 303 via a locking pin 307. The addition of the fixing ring 304 serves to lock the rotational position of the focus ring 303. The surface of the fixing ring 304 is provided with scales for the focus ring 303 and the light adjustment ring 305, which facilitates recording the rotation angle of the focus ring 303 or the light adjustment ring 305. It also allows the user to directly read the travel distance of the lens barrel 1 or the variable aperture 110, thereby reducing operational errors.

[0038] The rear lens assembly includes a fourth lens 201, a fifth spacer 202, a fifth lens 203, and a rear pressure ring 204, arranged in sequence along the optical axis. The fourth lens 201 is a biconvex lens, and the fifth lens 203 is a bimenus lens. The rear pressure ring 204 acts as a fixed lens, preventing lens displacement that could cause lens failure.

[0039] The end of the fixed barrel 2 is provided with a bayonet mount 205, which is secured to the end of the fixed barrel 2 by a plurality of second screws 206. The addition of the bayonet mount 205 facilitates mounting the lens to the camera and facilitates removal and installation. The bayonet mount 205 is secured to the end of the fixed barrel 2 by the plurality of second screws 206, which not only helps to improve the stability of the bayonet mount 205 and the rear end of the fixed barrel 2, but also facilitates replacement of the bayonet mount 205, improving lens compatibility.

[0040] The working principle of the present invention is:

[0041] When the focusing ring 303 rotates, the curved groove 5 of the adapter ring 3 drives the rotation, and the rotational motion is converted into the linear motion of the lens barrel 1, that is, the linear motion of the front lens group, ensuring that the front lens group moves along the optical axis, and realizing the control of the front lens group's forward and backward movement. The waist groove 4 extends along the moving direction of the guide pin 301, limiting the guide pin 301 to only forward and backward movement, that is, the lens barrel 1 can only move forward and backward, ensuring that the front lens group moves along the optical axis, changing the distance between the front lens group and the rear lens group, and realizing the focusing function.

[0042] When the aperture ring 305 rotates, the variable aperture 110 is driven to move via the aperture lever 114 and the aperture ring 115 to adjust the aperture size.

[0043] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention fall within the scope of protection of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An optical lens, characterized in that: The invention comprises an optical device and a mechanical device, wherein the optical device comprises a front lens group and a rear lens group arranged from the object side to the image side, and the mechanical device comprises a lens barrel (1), a fixed tube (2) and an adapter ring (3) which are sequentially sleeved on the lens barrel (1), the front lens group is installed in the lens barrel (1), the rear lens group is installed in the end of the fixed tube (2), a guide pin (301) is fixed on the side of the lens barrel (1), the fixed tube (2) is provided with a waist groove (4) which cooperates with the guide pin (301), and the adapter ring (3) is provided with a curved groove (5) which cooperates with the guide pin (301), and the curved groove (5) drives the guide pin (301) to move forward and backward along the direction of the waist groove (4) to change the distance between the front lens group and the rear lens group; The waist groove (4) extends along the moving direction of the guide pin (301), and the curved groove (5) is arranged around the side wall of the adapter ring (3); the waist groove (4) forms a straight hole along the optical axis, and the curved groove (5) forms a spiral channel along the optical axis; a guide sleeve (302) is installed at one end of the guide pin (301), and the other end of the guide pin (301) passes through the waist groove (4) and the curved groove (5) in sequence and is installed on the lens barrel (1).

2. An optical lens according to claim 1, characterized in that: The front lens group comprises a front pressure ring (116), a first lens (101), a first spacer (102), a second lens (103), a second spacer (104), a third lens (105), a third spacer (106), a first cemented lens (107), a fourth spacer (108), a second cemented lens (109), a variable aperture (110), a middle pressure ring (111) and a third cemented lens (112) which are sequentially arranged along the optical axis; the first lens (101) and the second lens (103) are both meniscus lenses; the third lens (105) is a bimenus lens; and the third cemented lens (112) is fixed in the lens barrel (1) via a middle lens seat (113).

3. An optical lens according to claim 2, characterized in that: An aperture lever (114) is fixed to the side of the variable aperture (110), an aperture ring (115) is fixed to the aperture lever (114), an end of the aperture lever (114) is connected to a light-adjusting ring (305), the light-adjusting ring (305) is sleeved on the fixed tube (2), and the light-adjusting ring (305) is fixed to the outside of the fixed tube (2) by means of a locking pin (307).

4. An optical lens according to claim 1, characterized in that: The mechanical device also includes a focus ring (303), and the focus ring (303) is fixed to the outer side of the adapter ring (3) by a first screw (306).

5. An optical lens as claimed in claim 4, characterized in that: A fixing ring (304) is sleeved on the end of the focus ring (303), and the fixing ring (304) fixes the focus ring (303) via a locking pin (307).

6. An optical lens according to claim 1, characterized in that: The rear lens group comprises a fourth lens (201), a fifth spacer ring (202), a fifth lens (203) and a rear pressure ring (204) which are sequentially arranged along the optical axis; the fourth lens (201) is a biconvex lens, and the fifth lens (203) is a bi-lunar lens.

7. An optical lens according to claim 1, characterized in that: The end of the fixing tube (2) is sleeved with a bayonet (205), and the bayonet (205) is fixed to the end of the fixing tube (2) by a plurality of second screws (206).

Images