Annular light source with variable aperture

Abstract

The utility model discloses a ring-shaped light source with a variable aperture, which comprises a ring-shaped switching base, a first detection opening, a second detection opening and a light source, an annular light source is arranged in the middle of the adapter base, the annular light source comprises a light source base and an upper cover plate which are buckled with each other, a second detection opening and a third detection opening are formed in the light source base and the upper cover plate respectively, and an annular circuit board is arranged between the light source base and the upper cover plate; a plurality of LED lamp beads are uniformly arranged on the annular circuit board; an adjustable diaphragm is arranged above the second detection opening, aperture adjustment of the second detection opening is achieved, and the axis of the first detection opening, the axis of the second detection opening, the axis of the third detection opening and the axis of the adjustable diaphragm are located on the same axis. The aperture of the annular light source can be changed through the adjustable diaphragm so as to meet the detection requirements of different product sizes, the adjustment is convenient, the cost is saved, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of detection light sources, and in particular to a ring light source with a variable aperture. Background Technology

[0002] For defect detection on product edges or surfaces, a ring light source is usually required. However, the LEDs in a ring light source have a large divergence angle, and the size of the ring light source is relatively fixed. When inspecting products of different sizes, the imaging effect is affected by the product size, resulting in inconsistent effects. Therefore, it is necessary to improve the ring light source to adapt to different product sizes and improve the imaging effect. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a ring light source with a variable aperture. The aperture of the ring light source can be changed by adjusting the aperture to adapt to the detection needs of different product sizes. It is easy to adjust, saves costs, and improves detection efficiency.

[0004] To achieve the above objectives, this utility model provides a ring light source with a variable aperture, comprising:

[0005] An annular adapter base has a first detection opening at its center;

[0006] The adapter base is provided with a ring light source in the middle. The ring light source includes a light source base and a top cover plate that are interlocked with each other. A second detection opening and a third detection opening are respectively provided on the light source base and the top cover plate. A ring circuit board is provided between the light source base and the top cover plate. A number of LED beads are evenly arranged on the ring circuit board.

[0007] An adjustable aperture is provided above the second detection opening to adjust the aperture of the second detection opening. The axes of the first detection opening, the second detection opening, the third detection opening and the adjustable aperture are on the same axis.

[0008] Furthermore, a first mounting cavity is provided around the first detection opening, and the light source base is fixedly connected to the first mounting cavity, so that the second detection opening overlaps with the first detection opening. The inner wall of the first mounting cavity directly limits the outer edge of the light source base, realizing radial zero-gap assembly, and enabling direct contact between the light source base and the adapter base, which can effectively conduct heat from the annular circuit board to the adapter base for heat dissipation.

[0009] Furthermore, the depth of the first mounting cavity is less than the height of the light source base. This ensures that the LED beads are positioned slightly higher than the adapter base, preventing the adapter base from interfering with the light output quality of the ring light source.

[0010] Furthermore, the annular circuit board is externally connected to a power cord. A strip-shaped through-slot is formed in the first mounting cavity, and a first through-hole is provided on the light source base. The power cord passes through the strip-shaped through-slot and the first through-hole in sequence to connect to the annular circuit board. The power cord is connected through an internal channel, reducing the space occupied by external wiring and lowering production costs. The strip-shaped through-slot provides a certain amount of leeway to prevent the power cord from being excessively bent or stretched during the installation of the light source base. Moreover, the power cord can pass through the strip-shaped through-slot first, then the light source base is installed, and finally the circuit board is connected through the first through-hole, achieving modular assembly.

[0011] Furthermore, a second mounting cavity is provided on the light source base, and a first snap-fit ​​groove is provided in the second mounting cavity. A second snap-fit ​​groove that mates with the first snap-fit ​​groove is provided at the lower end of the upper cover plate. The upper and lower ends of the annular circuit board are respectively inserted into the first snap-fit ​​groove and the second snap-fit ​​groove. The annular circuit board is directly embedded through the upper and lower snap-fit ​​grooves, avoiding PCB deformation caused by traditional screw fixing. At the same time, the snap-fit ​​structure forces the center of the circuit board to be coaxial with the detection opening, ensuring that the LED light emission direction is strictly perpendicular. The metal wall of the snap-fit ​​groove is tightly attached to the upper and lower surfaces of the circuit board, forming a double-sided heat dissipation path.

[0012] Furthermore, a transition section is formed between the first card slot and the second detection opening, and the LED bead is positioned above this transition section. This reduces stray light intensity and improves the image signal-to-noise ratio.

[0013] Furthermore, the diameter of the third detection opening is larger than that of the second detection opening, so that the third detection opening and the second detection opening have a diameter difference.

[0014] Furthermore, the LED bead is oriented toward the axis of the third detection opening, and the end of the LED bead is positioned outside the projection position of the edge of the third detection opening.

[0015] Furthermore, a third mounting cavity is formed at the lower end of the adjustable aperture, which encloses the annular light source. The third mounting cavity forms a cylindrical light-shielding barrier, completely isolating stray ambient light, improving the signal-to-noise ratio of the detection area, and ensuring that the aperture adjustment range is precisely matched with the emitting surface of the annular light source, thus avoiding the edge light leakage problem of traditional external apertures.

[0016] Furthermore, the adjustable aperture includes an aperture base, a movable ring, several aperture blades, and an aperture adjustment mechanism. The movable ring is rotatably mounted on the aperture base and has several guide grooves. Each aperture blade is arc-shaped, and the aperture blades are spirally stacked on the movable ring. Each aperture blade has an aperture connecting rod at its end. One end of the connecting rod is engaged in the guide groove, while the other end is rotatably mounted on the aperture base. The aperture adjustment mechanism is linked to the movable ring. Rotating the aperture adjustment mechanism causes the movable ring to rotate, which in turn moves the aperture connecting rod along the guide grooves, causing the aperture blades to contract or expand, thus controlling the aperture size.

[0017] Compared with the prior art, the present invention has the following advantages: The present invention integrates the adjustable aperture with the ring light source, and in particular, sets the adjustable aperture outside the third detection opening to realize stepless adjustment of the light source exit aperture, which can adapt to the detection needs of different sizes of products, is convenient to adjust, saves costs, and improves detection efficiency.

[0018] Furthermore, the first detection opening, the second detection opening, the third detection opening, and the adjustable aperture of this utility model are set as a four-layer structure with the same axis, which is strictly coaxial, avoiding edge shadows or uneven brightness caused by eccentricity and improving the detection quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a ring light source with a variable aperture according to the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the decomposition process;

[0022] Figure 3 This is a structural schematic diagram of the adapter base of this utility model;

[0023] Figure 4 This is a structural schematic diagram of the light source base of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the top cover plate of this utility model;

[0025] Figure 6 This is a top-down view with the variable aperture removed;

[0026] Figure 7 This is a schematic diagram of the structure of the variable aperture of this utility model;

[0027] Figure 8 This is a schematic diagram of the variable aperture of this utility model from another perspective.

[0028] The diagram includes:

[0029] 1. Adapter base; 11. First detection opening; 12. First mounting cavity; 13. Third mounting hole; 14. Strip through groove; 15. Second mounting hole; 2. Ring light source; 21. Light source base; 211. Fourth mounting hole; 212. Second detection opening; 213. Second mounting cavity; 214. First snap-fit ​​groove; 215. Sixth mounting hole; 216. Transition part; 217. First through hole; 22. Top cover plate; 221. Third detection opening; 222. Second snap-fit ​​groove; 223. Fifth mounting hole; 23. Ring circuit board; 231. LED lamp bead; 3. Adjustable aperture; 31. Aperture base; 32. Movable ring; 33. Aperture blade; 34. Aperture adjustment component; 35. Guide groove; 36. Aperture connecting rod; 37. Third mounting cavity; 38. First mounting hole; 4. Power cord. Detailed Implementation

[0030] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0033] Please see Figures 1 to 8 An embodiment of this utility model provides a ring light source with a variable aperture, including a ring-shaped adapter base 1, a ring light source 2, and an adjustable aperture 3;

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, a first detection opening 11 is provided in the center of the adapter base 1; the aforementioned ring light source 2 is installed on the adapter base 1. Specifically, the ring light source 2 includes a ring circuit board 23 and a light source base 21 and an upper cover plate 22 that are interlocked with each other. A first mounting cavity 12 is provided around the first detection opening 11. The light source base 21 is fixedly connected to the first mounting cavity 12. Specifically, a plurality of evenly distributed third mounting holes 13 are provided on the first mounting cavity 12. The third mounting holes 13 penetrate the adapter base 1. A fourth mounting hole 211 matching the third mounting holes 13 is provided at the bottom of the light source base 21. During assembly, screws are inserted from the bottom of the adapter base 1 so that the light source base 21 is installed in the first mounting cavity 12. The fourth mounting hole 211 does not penetrate the light source base 21 so that the screws will not interfere with the operation of the ring light source 2 when the screws are connected.

[0035] A second detection opening 212 and a third detection opening 221 are respectively provided on the light source base 21 and the upper cover plate 22. After the light source base 21 is installed in the first mounting cavity 12, the second detection opening 212 is stacked with the first detection opening 11. Preferably, the depth of the first mounting cavity 12 is less than the height of the light source base 21, so that the position of the LED lamp bead 231 is slightly higher than the adapter base 1, avoiding the adapter base 1 from interfering with the light output quality of the ring light source 2.

[0036] The annular circuit board 23 is disposed between the light source base 21 and the upper cover plate 22. Specifically, the light source base 21 is provided with a second mounting cavity 213, and the second mounting cavity 213 is provided with a first snap-fit ​​groove 214. The lower end of the upper cover plate 22 is provided with a second snap-fit ​​groove 222 that cooperates with the first snap-fit ​​groove 214. The upper cover plate 22 is provided with a plurality of fifth mounting holes 223. The light source base 21 is provided with a sixth mounting hole 215 that matches the fifth mounting holes 223. The light source base 21 and the upper cover plate 22 are fixed by screws through the fifth mounting holes 223 and the sixth mounting holes 215. The upper and lower ends of the annular circuit board 23 are respectively inserted into the first snap-fit ​​groove 214 and the second snap-fit ​​groove 222. After the light source base 21 and the upper cover plate 22 are connected, the light source base 21 and the upper cover plate 22 respectively snap-fit ​​the upper and lower ends of the annular circuit board 23.

[0037] A plurality of LED beads 231 are evenly arranged on the annular circuit board 23. The LED beads 231 are arranged in a horizontal direction. A transition portion 216 is formed between the first snap-fit ​​groove 214 and the second detection opening 212. The LED beads 231 are positioned higher than the transition portion 216, thereby placing the LED beads 231 above the second detection opening 212, which can reduce the intensity of stray light.

[0038] The diameter of the third detection opening 221 is larger than that of the second detection opening 212, so that the third detection opening 221 and the second detection opening 212 form a diameter difference. The LED bead 231 faces the axis of the third detection opening 221, and the end of the LED bead 231 is placed outside the projection position of the edge of the third detection opening 221, so that the emitted light of the LED bead 231 is more concentrated towards the direction of the third detection opening 221. The annular circuit board 23 is externally connected to a power line 4. A strip-shaped through groove 14 is opened on the first mounting cavity 12, and a first through hole 217 is provided on the light source base 21. The power line 4 passes through the strip-shaped through groove 14 and the first through hole 217 in sequence and connects to the annular circuit board 23. The power cord 4 is connected through an internal channel, which reduces the space occupied by external wiring and lowers production costs. The strip groove 14 provides a certain amount of movement leeway to prevent the power cord 4 from being excessively bent or stretched when the light source base 21 is installed. Furthermore, the power cord 4 can pass through the strip groove 14 first, then the light source base 21 is installed, and finally the ring circuit board 23 is connected through the first through hole 217 to achieve modular assembly.

[0039] An adjustable aperture 3 is provided above the second detection opening 212. The adjustable aperture 3 of this invention is a commercially available adjustable aperture 3 (also called an adjustable aperture or variable aperture), typically used for adjusting the aperture of a camera. This invention applies it to the ring light source 2 to achieve aperture adjustment of the second detection opening 212. Since the adjustable aperture 3 of this invention uses a conventional adjustable aperture 3, its structure and principle are only briefly described: Figure 7 As shown, the adjustable aperture 3 is provided with an aperture base 31, a movable ring 32, several aperture blades 33, and an aperture adjustment component 34. The movable ring 32 is rotatably mounted on the aperture base 31. Several guide grooves 35 are provided on the movable ring 32. Each aperture blade 33 is arc-shaped. Several aperture blades 33 are spirally stacked on the movable ring 32 in sequence, and the end of each aperture blade 33 is connected to an aperture connecting rod 36. One end of the aperture connecting rod 36 is locked in the guide groove 35, and the other end of the aperture connecting rod 36 is rotatably mounted on the aperture base 31. The aperture adjustment component 34 is linked with the movable ring 32. In use, the aperture adjustment component 34 can be pushed to rotate, which drives the movable ring 32 to rotate. The movable ring 32 drives the aperture connecting rod 36 to move on the guide groove 35, so that the aperture blades 33 contract or open, thereby achieving the contraction or enlargement of the aperture. The axes of the first detection opening 11, the second detection opening 212, the third detection opening 221, and the adjustable aperture 3 are on the same axis.

[0040] like Figure 8As shown, a third mounting cavity 37 is formed at the lower end of the aperture base 31, which encloses the ring light source 2. The third mounting cavity 37 forms a cylindrical light-shielding barrier, which completely isolates stray ambient light, improves the signal-to-noise ratio of the detection area, and precisely matches the aperture adjustment range with the light-emitting surface of the ring light source 2, avoiding the edge light leakage problem of traditional external apertures.

[0041] The aperture base 31 has first mounting holes 38 on its four sides, and the adapter base 1 has second mounting holes 15 that match the first mounting holes 38. The adjustable aperture 3 is precisely positioned and securely installed by screws through the first mounting holes 38 and the second mounting holes 15.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A ring light source with a variable aperture, characterized in that, include: The annular adapter base (1) has a first detection opening (11) at its center; The adapter base (1) is provided with a ring light source (2) in the middle. The ring light source (2) includes a light source base (21) and an upper cover plate (22) that are interlocked with each other. A second detection opening (212) and a third detection opening (221) are respectively provided on the light source base (21) and the upper cover plate (22). A ring circuit board (23) is provided between the light source base (21) and the upper cover plate (22). A number of LED beads (231) are evenly arranged on the ring circuit board (23). An adjustable aperture (3) is provided above the second detection opening (212) to adjust the aperture of the second detection opening (212). The axes of the first detection opening (11), the second detection opening (212), the third detection opening (221) and the adjustable aperture (3) are on the same axis.

2. The ring light source with variable aperture according to claim 1, characterized in that, A first mounting cavity (12) is provided around the first detection opening (11), and the light source base (21) is fixed in the first mounting cavity (12), so that the second detection opening (212) overlaps with the first detection opening (11).

3. A ring light source with a variable aperture according to claim 2, characterized in that, The depth of the first mounting cavity (12) is less than the height of the light source base (21).

4. A ring light source with a variable aperture according to claim 2, characterized in that, The annular circuit board (23) is connected to a power line (4). A strip-shaped through groove (14) is provided on the first mounting cavity (12). A first through hole (217) is provided on the light source base (21). The power line (4) passes through the strip-shaped through groove (14) and the first through hole (217) in sequence and connects to the annular circuit board (23).

5. A ring light source with a variable aperture according to claim 1, characterized in that, The light source base (21) is provided with a second mounting cavity (213), and a first snap-fit ​​groove (214) is provided in the second mounting cavity (213). A second snap-fit ​​groove (222) that cooperates with the first snap-fit ​​groove (214) is provided at the lower end of the upper cover plate (22). The upper and lower ends of the annular circuit board (23) are respectively inserted into the first snap-fit ​​groove (214) and the second snap-fit ​​groove.

6. A ring light source with a variable aperture according to claim 5, characterized in that, A transition portion (216) is formed between the first snap-fit ​​groove (214) and the second detection opening (212), and the LED bead (231) is positioned above the transition portion (216).

7. A ring light source with a variable aperture according to claim 1, characterized in that, The diameter of the third detection opening (221) is larger than that of the second detection opening (212), so that the third detection opening (221) and the second detection opening (212) form a diameter difference.

8. A ring light source with a variable aperture according to claim 7, characterized in that, The LED bead (231) is oriented toward the axis of the third detection opening (221), and the end of the LED bead (231) is positioned outside the projection position of the edge of the third detection opening (221).

9. A ring light source with a variable aperture according to claim 1, characterized in that, The lower end of the adjustable aperture (3) forms a third mounting cavity (37), which encloses the annular light source (2).

10. A ring light source with a variable aperture according to claim 1, characterized in that, The adjustable aperture (3) is provided with an aperture base (31), a movable ring (32), several aperture blades (33), and an aperture adjustment component (34). The movable ring (32) is rotatably mounted on the aperture base (31). Several guide grooves (35) are provided on the movable ring (32). Each aperture blade (33) is arc-shaped. Several aperture blades (33) are spirally stacked on the movable ring (32) in sequence. Each aperture blade (33) is connected to an aperture connecting rod (36) at its end. One end of the aperture connecting rod (36) is locked in the guide groove (35), and the other end of the aperture connecting rod (36) is rotatably mounted on the aperture base (31). The aperture adjustment component (34) is linked with the movable ring (32).

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