Industrial camera lens system and 3D camera, focusing method

Abstract

The application discloses an industrial camera lens system, which comprises an industrial lens, a base, a fixed part connected with the base, a movable part connected with the fixed part on one side and forming a free end on the other side, a pipe clamp formed by cooperation of the free end and the fixed part, an inner wall of the pipe clamp having at least three internal thread segments, the internal thread segments being continuously extended along an axial direction, adjacent internal thread segments being discontinuously arranged in a circumferential direction, a pre-tightening positioning piece vertically penetrating through the movable part and abutting against an external thread of the industrial lens to realize radial pre-fixing of the industrial lens and the internal thread segments, and a locking piece vertically penetrating through the free end of the movable part and connected with the fixed part, so that the free end of the movable part is deformed towards the fixed part or away from the fixed part to realize radial clamping or loosening of the pipe clamp on the industrial lens. The application further discloses a 3D camera. The application further discloses a focusing method for the industrial lens. The application guarantees that the industrial lens is not affected by locking force to generate position deviation and ensures position precision of the industrial lens.

Description

Technical Field

[0001] This invention belongs to the field of 3D camera manufacturing, and in particular relates to an industrial camera lens system, a 3D camera, and a fixed-focus method. Background Technology

[0002] With the development of artificial intelligence, machine vision inspection has been applied in various fields. Among them, the most critical factor affecting the inspection effect in machine vision is the optical device. High-precision digital cameras use image sensors such as CCD or CMOS to sense light. CCD and CMOS are very sensitive to light. Therefore, in order to obtain better imaging effect, it is necessary to ensure that the lens can stably focus the light on the image sensor. Therefore, lens fixation and adjustment are very important aspects.

[0003] Currently, the most common way to fix lenses is by using double nuts. This method involves tightening an external nut onto the lens, and the relative axial force generated between the nut and the lens causes the thread to be squeezed on one side and the friction to be increased rapidly, thereby fixing the lens. In other words, this method can eliminate the axial clearance of the thread, but the axial relative position is the main factor affecting the lens's focusing accuracy.

[0004] However, for precision optical instruments, we need to consider the impact of radial clearance in the threads on accuracy. With double nuts, the lens is subjected to axial force from the nuts, and the axial clearance between the threads causes the lens to shift axially, affecting focusing accuracy. Simultaneously, to reduce instrument size, we need to make full use of compact space and minimize the number of parts to reduce costs. To address these issues, we need to design a high-precision, adjustable, and compact lens clamping and adjustment device, as well as a space-saving and accuracy-enhancing mounting method. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides an industrial camera lens system and a 3D camera and a fixed-focus method that provides stable lens clamping without affecting focusing accuracy during the clamping process.

[0006] The technical solution adopted by this invention to solve its technical problem is: an industrial camera lens system, including an industrial lens with external threads on its outer wall, and further comprising:

[0007] Base;

[0008] The fixing part is connected to the base;

[0009] The movable part is connected to the fixed part on one side and forms a free end on the other side. The free end cooperates with the fixed part to form an internally hollow tube clamp. The inner wall of the tube clamp has at least three internal thread segments that can be threaded to an industrial lens. The internal thread segments extend continuously along the axial direction and adjacent internal thread segments are circumferentially discontinuous.

[0010] The pre-tightening positioning component can pass vertically through the movable part and abut against the external thread of the industrial lens to achieve radial pre-fixation of the industrial lens and the internal thread section;

[0011] The locking element, which passes vertically through the free end of the movable part and is connected to the fixed part, causes the free end of the movable part to deform in the direction of approaching or moving away from the fixed part, thereby realizing the radial clamping or releasing of the tube clamp on the industrial lens.

[0012] Furthermore, the hollowed-out area of ​​the tube clamp has a triangular cross-section; the free end has an extension section formed by bending towards the fixed part, the extension section extends along the length direction of the movable part, and forms a through hole for the insertion of the locking member.

[0013] Furthermore, auxiliary positioning elements are provided on both sides of the locking element, and the straight line containing the locking element and the auxiliary positioning elements is parallel to the axis of the industrial lens.

[0014] Furthermore, the pre-tightening positioning element is made of an elastic material.

[0015] Furthermore, the end of the pre-tightening positioning member has a mesh structure.

[0016] Furthermore, the number of internal thread segments is three, which are evenly spaced.

[0017] Furthermore, the movable part is parallel to the bottom surface of the base in the relaxed state, and the movable part is provided with at least one internal thread section.

[0018] Furthermore, the central angle of the internal thread segment is 20-60°.

[0019] Furthermore, the base forms a first mounting hole for the first fastener to pass through in a vertical direction, the fixing part forms a second mounting hole for the second fastener to pass through in a horizontal direction, and a limiting slot is formed below the second mounting hole.

[0020] The present invention also discloses a 3D camera, including a housing, an optical-mechanical lens disposed within the housing, and an industrial camera lens system as described above.

[0021] This invention also discloses a focusing method for industrial lenses, comprising the following steps:

[0022] The industrial lens is axially inserted into the tube clamp formed by the cooperation of the free end of the movable part and the fixed part;

[0023] The external thread of the industrial lens mates with the internal thread section of the inner wall of the pipe clamp, and the industrial lens is rotated to achieve focusing.

[0024] Hold the industrial lens in the focused position, drive the pre-tightening positioning component to move down and abut against the external thread of the industrial lens, so that the industrial lens fits against at least two internal thread segments on the fixing part;

[0025] Determine whether the target focus state has been achieved;

[0026] The vertically downward moving locking component causes the free end of the movable part to deform towards the fixed part, and the internal thread section of the movable part fits tightly against the outer wall of the industrial lens.

[0027] Complete the axial fixation and radial clamping of the industrial lens using the tube clamp.

[0028] The beneficial effects of this invention are: 1) By cooperating with the internal thread section of the pipe clamp's inner wall and the pre-tightening positioning component, the industrial lens is pre-positioned, ensuring that the industrial lens is not affected by the locking force and thus ensuring the positional accuracy of the industrial lens; 2) Compared with the double-nut clamping method, this device has one less nut, saving installation space for the industrial lens, which helps reduce product cost and product size; 3) The industrial lens is fixed by a three-point positioning method using the internal thread section during locking. Compared with the double-nut clamping method, the three-point positioning method can simultaneously eliminate the axial and radial clearances of the threads, ensuring that there is no positional shift in the axial direction when the industrial lens is locked, thus ensuring positioning accuracy; 4) Conventional pipe clamp methods consist of two movable parts, and the positioning and fixing of the industrial lens are achieved by the deformation of the movable parts. Since the amount of deformation, the deformation method, and the final contact position with the industrial lens are not constrained, the radial position of the industrial lens is not controlled, leading to... The image quality performance obtained by the sensor, or the consistency of the impact, is addressed by the three-point positioning method of this invention, which uses three threaded segments evenly distributed inside the pipe clamp. The deformation amount and deformation mode of each positioning point are relatively consistent, thus the radial position of the industrial lens is controllable. At the same time, the industrial lens can be rotated to adjust its front and rear position when not locked, realizing the precise positioning and adjustment function of the industrial lens; 5) Two auxiliary positioning parts are configured on both sides of the locking part to ensure that the downward pressing direction of the locking part does not deviate when locking, ensuring that the vertical downward pressing does not affect the front and rear position of the industrial lens, thus ensuring the focusing accuracy of the industrial lens; 6) The product volume is reduced and the ease of product installation is improved while ensuring installation accuracy; 7) The installation method of this invention has three degrees of freedom, and only one degree of freedom needs to be fixed with the first fastener to achieve complete positioning, which not only reduces the installation space but also improves the installation accuracy; 8) The focus adjustment operation is convenient. Attached Figure Description

[0029] Figure 1 This is a front view of the clamp holding an industrial lens according to the present invention.

[0030] Figure 2 This is a perspective view of the clamp holding an industrial lens according to the present invention.

[0031] Figure 3 This is an exploded structural diagram of the present invention and the industrial lens.

[0032] Figure 4 The three-dimensional representation of the present invention Figure 1 .

[0033] Figure 5 The three-dimensional representation of the present invention Figure 2 .

[0034] Figure 6 This is a perspective view of the present invention, showing an industrial lens held in place and mounted inside a 3D camera housing.

[0035] Figure 7 This is an exploded structural diagram of the clamp holding an industrial lens and a 3D camera housing according to the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] like Figures 1-5 As shown, an industrial camera lens system includes an industrial lens 1 with an external thread 11 on its outer wall, a base 21, a fixed part 22 connected to the base 21, a movable part 23, a pre-tightening positioning member 4, and a locking member 5.

[0038] One side of the movable part 23 is connected to the fixed part 22, and the other side forms a free end 231. This free end 231 and the fixed part 22 cooperate to form a pipe clamp 3. Specifically, with Figure 1 Taking the direction shown as an example, the right end of the movable part 23 is integrally connected to the fixed part 22, and the left end of the movable part 23 is a free end 231 that is a certain distance away from the fixed part 22. In the relaxed state, the movable part 23 is parallel to the bottom surface of the base 21. That is to say, in the initial state, the top surface of the movable part 23 is horizontal. Of course, in other embodiments, the movable part 23 may have a certain degree of inclination in the relaxed state.

[0039] The inner wall of the pipe clamp 3 has at least three internal thread segments 31 that can be threadedly connected to the industrial lens 1. These internal thread segments 31 extend continuously along the axial direction, while adjacent internal thread segments 31 are discontinuously arranged circumferentially. In other words, the internal threads on the inner wall of the pipe clamp 3 are not circumferentially continuous. In this embodiment, at least one internal thread segment 31 is located on the side wall of the movable part 23 facing the fixed part 22. The central angle of each internal thread segment 31 is 20-60°, preferably 30°, 45°, or 60°. In this embodiment, there are three internal thread segments 31, each with the same central angle and evenly spaced. Of course, in other embodiments, the central angles of the internal thread segments 31 may differ, and the intervals between adjacent internal thread segments 31 may also differ.

[0040] The pre-tightening positioning member 4 can pass vertically through the movable part 23 and abut against the external thread 11 of the industrial lens 1, thereby achieving radial pre-fixation of the industrial lens 1 and the internal thread section 31. Here, the pre-tightening positioning member 4 can be threadedly connected to the movable part 23. In this embodiment, the pre-tightening positioning member 4 is made of an elastic material, such as rubber or silicone, and its lower end has a mesh structure. Specifically, the lower end of the pre-tightening positioning member 4 is cut into multiple small-area protrusions, and grooves are formed between adjacent protrusions, allowing the protrusions to deform more, increasing the surface area of ​​its lower end, ensuring effective pre-fixation between the pre-tightening positioning member 4 and the industrial lens 1, and protecting the external thread 11 of the industrial lens 1 from damage. That is, after the industrial lens 1 is threadedly connected in the pipe clamp 3 and the position of the industrial lens 1 is adjusted to achieve focus, the pre-tightening positioning member 4 is first moved downwards to radially press against the industrial lens 1 to prevent it from deviating from the target position.

[0041] The locking member 5 passes vertically through the free end 231 of the movable part 23 and is connected to the fixed part 22, so that the free end 231 of the movable part 23 deforms in the direction of approaching or moving away from the fixed part 22, in order to realize the radial clamping or releasing of the tube clamp 3 on the industrial lens 1.

[0042] To ensure that the clamp 3 effectively holds the industrial lens 1 and prevents the focal position of the industrial lens 1 from shifting, the cutout area of ​​the clamp 3 has a triangular cross-section with the base facing upwards and the apex facing downwards, and the connections between the sides are rounded. Internal threads are formed on the inner wall of each side of the triangle, so each side of the triangle is not completely horizontal, and there is still a certain arc-shaped concave structure at the internal thread.

[0043] The free end 231 has an extension 232 formed by bending towards the fixed part 22. This extension 232 extends along the length of the movable part 23 and forms a through hole 233 for the vertical insertion of the locking member 5. In other words, the top surface of the movable part 23 is not completely horizontal, nor is its inner wall completely horizontal. Instead, it forms a downward-bending stepped structure, giving the movable part 23 two parts. One part corresponds to the hollow area of ​​the tube clamp 3, while the part of the free end 231 corresponds to the fixed part 22. This not only shortens the distance between the free end 231 and the fixed part 22 but also preserves the rounded corners of the triangular hollow area to a certain extent, making the clamping of the industrial lens 1 more stable and without adversely affecting the focus.

[0044] Auxiliary positioning components 51 are provided on both sides of the locking component 5. The straight line of the locking component 5 and the auxiliary positioning components 51 is parallel to the axis of the industrial lens 1, and the auxiliary positioning components 51 on both sides are symmetrically distributed.

[0045] A through hole 211 is provided on the base 21 at a position directly opposite to the industrial lens 1, and a gap 213 is formed between the base 21 and the fixing part 22, thereby providing space for the industrial lens 1 to adjust the focus front and back.

[0046] A first mounting hole 212 is formed on the base 21 for the first fastener 61 to pass through in a vertical direction, and the first mounting hole 212 is also located within the gap 213. A second mounting hole 221 is formed on the fixing part 22 for the second fastener 62 to pass through in a horizontal direction, and a limiting slot 222 is formed below the second mounting hole 221, the bottom and sides of the limiting slot 222 being open.

[0047] like Figure 6 , Figure 7 As shown, a positioning protrusion 71 is formed at the position of the industrial lens 1 on the 3D camera housing 7. This protrusion extends from the inner sidewall of the 3D camera housing 7 and is used to form a mounting fit with the limiting slot 222. A third mounting hole 72 is formed above the positioning protrusion 71 and on its sidewall. A second fastener 62 passes through the third mounting hole 72 and the second mounting hole 221 horizontally, thereby achieving positioning and mounting of the 3D camera housing 7 in both the vertical and horizontal directions. Simultaneously, a fourth mounting hole 73 is also provided on the bottom surface of the 3D camera housing 7. The first fastener 61 passes vertically through the first mounting hole 212 and is then assembled and connected to the fourth mounting hole 73.

[0048] A 3D camera includes a housing 7, an optical-mechanical lens 8 disposed within the housing 7, and the aforementioned industrial camera lens system disposed within the housing 7.

[0049] A fixed-focusing method for industrial lenses includes the following steps:

[0050] The industrial lens 1 is axially inserted into the hollow area of ​​the tube clamp 3 formed by the cooperation of the free end 231 of the movable part 23 and the fixed part 22;

[0051] The external thread 11 of the industrial lens 1 is threadedly connected to the internal thread section 31 of the inner wall of the pipe clamp 3. The industrial lens 1 is rotated to adjust its position to complete the focusing and ensure the shooting accuracy. At this time, the axial fixation of the industrial lens 1 by the pipe clamp 3 is completed. To be precise, the internal thread section 31 of the inner wall of the pipe clamp 3 realizes the axial fixation of the industrial lens 1, fixing it in the position after the focusing is completed.

[0052] After adjustment, the industrial lens 1 is held in the focused position, and the pre-tightening positioning part 4 is driven to move downward and abut against the external thread 11 of the industrial lens 1, so that the industrial lens 1 is in contact with at least two internal thread segments 31 on the fixing part 22; at this time, the radial pre-fixing of the industrial lens 1 is completed.

[0053] Check if the industrial lens 1 is adjusted to the optimal focus state. If not, loosen the pre-tightening positioning piece 4 and continue axial adjustment. If the optimal focus state has been reached, move the locking piece 5 vertically downward, causing the free end 231 of the movable part 23 to deform towards the fixed part 22. The internal thread section 31 of the movable part 23 fits tightly against the outer wall of the industrial lens 1. Here, "fitting tightly" means that before the locking piece 5 moves downward, the internal thread section 31 of the movable part 23 may or may not be in contact with the outer wall of the industrial lens 1. At this time, the radial clamping of the industrial lens 1 by the pipe clamp 3 is completed, eliminating the axial and radial clearance of the thread.

[0054] The pipe clamp 3 completes the axial fixation and radial clamping of the industrial lens 1, which will not deviate from the previously determined fixed focus position. This ensures that the positional accuracy of the industrial lens 1 is not affected by the locking force, improves the shooting accuracy of the product, and also ensures the consistency of mass production.

[0055] The industrial camera lens system holding the industrial lens 1 is assembled into the 3D camera housing 7. Specifically, the limiting slot 222 is aligned with the positioning protrusion 71 to position the industrial camera lens system in the front-back direction within the 3D camera housing 7. Then, the second fastener 62 is passed horizontally through the third mounting hole 72 and the second mounting hole 221 to position the industrial camera lens system in the vertical direction within the 3D camera housing 7. Finally, the first fastener 61 is vertically passed through the first mounting hole 212 and assembled with the fourth mounting hole 73 to position the industrial camera lens system in the left-right direction within the 3D camera housing 7.

[0056] The above specific embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An industrial camera lens system, comprising an industrial lens (1) with external threads (11) on its outer wall, characterized in that, Also includes: Base (21); The fixing part (22) is connected to the base (21); The movable part (23) is connected to the fixed part (22) on one side and forms a free end (231) on the other side. The free end (231) cooperates with the fixed part (22) to form an internally hollowed tube clamp (3). The inner wall of the tube clamp (3) has at least three internal thread segments (31) that can be threadedly connected to the industrial lens (1). The internal thread segments (31) extend continuously along the axial direction, and adjacent internal thread segments (31) are intermittently arranged circumferentially. The pre-tightening positioning component (4) can pass vertically through the movable part (23) and abut against the external thread (11) of the industrial lens (1) to achieve radial pre-fixation of the industrial lens (1) and the internal thread section (31); The locking member (5) is connected to the fixed part (22) through the free end (231) of the movable part (23) perpendicularly, so that the free end (231) of the movable part (23) deforms in the direction of approaching or moving away from the fixed part (22) to achieve radial clamping or loosening of the tube clamp (3) on the industrial lens (1).

2. The industrial camera lens system according to claim 1, characterized in that: The hollow area of ​​the tube clamp (3) has a triangular cross section; the free end (231) has an extension section (232) formed after bending towards the fixed part (22), the extension section (232) extends along the length direction of the movable part (23) and forms a through hole (233) for the locking member (5) to be inserted.

3. The industrial camera lens system according to claim 1 or 2, characterized in that: The locking member (5) is provided with auxiliary positioning members (51) on both sides. The straight line of the locking member (5) and the auxiliary positioning members (51) is parallel to the axis of the industrial lens (1).

4. The industrial camera lens system according to claim 1, characterized in that: The pre-tightening positioning element (4) is made of elastic material.

5. The industrial camera lens system according to claim 1 or 4, characterized in that: The end of the pre-tightening positioning member (4) has a mesh structure.

6. The industrial camera lens system according to claim 1, characterized in that: The number of internal thread segments (31) is three, which are evenly spaced.

7. The industrial camera lens system according to claim 6, characterized in that: The movable part (23) is parallel to the bottom surface of the base (21) in the relaxed state, and the movable part (23) is provided with at least one internal thread section.

8. The industrial camera lens system according to claim 1, characterized in that: The central angle of the internal thread section (31) is 20-60°.

9. The industrial camera lens system according to claim 1, characterized in that: The base (21) forms a first mounting hole (212) through which the first fastener (61) passes in the vertical direction, and the fixing part (22) forms a second mounting hole (221) through which the second fastener (62) passes in the horizontal direction. A limiting slot (222) is formed below the second mounting hole (221).

10. A 3D camera, characterized in that: It includes a housing (7), an optical-mechanical lens (8) disposed within the housing (7), and an industrial camera lens system as claimed in any one of claims 1-9.

11. A fixed-focusing method for industrial lenses, based on the industrial camera lens system of any one of claims 1-9, characterized in that, Includes the following steps: The industrial lens is axially inserted into the tube clamp formed by the cooperation of the free end of the movable part and the fixed part; The external thread of the industrial lens mates with the internal thread section of the inner wall of the pipe clamp, and the industrial lens is rotated to achieve focusing. Hold the industrial lens in the focused position, drive the pre-tightening positioning component to move down and abut against the external thread of the industrial lens, so that the industrial lens fits against at least two internal thread segments on the fixing part; Determine whether the target focus state has been achieved; The vertically downward moving locking component causes the free end of the movable part to deform towards the fixed part, and the internal thread section of the movable part fits tightly against the outer wall of the industrial lens. Complete the axial fixation and radial clamping of the industrial lens using the tube clamp.

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