Coaxial parallel light source structure

Abstract

The utility model discloses a coaxial parallel light source structure, belongs to the technical field of light sources, and aims to solve the technical problems that in the prior art, the incident angle of light emitted to a Fresnel lens by a coaxial parallel light source structure is fixed, and the flexibility is low. The coaxial parallel light source structure comprises a box body, wherein a Fresnel lens is arranged at one end of the top of the box body; the point light source is arranged above the Fresnel lens; the driving mechanism is arranged on the box body and is used for driving the point light source to move close to or far away from the Fresnel lens; the driving mechanism comprises a fixed arm vertically fixed on the box body, a cross rod arranged on one side of the fixed arm in a sliding manner, a sliding block embedded in the fixed arm in a sliding manner, a screw rod vertically and rotatably mounted in the fixed arm, and a motor mounted on the fixed arm and used for driving the screw rod to rotate. The coaxial parallel light source structure has the function of changing the focal length of the Fresnel lens, can perform gathering or diffusion adjustment on emitted parallel light rays, and can meet different detection requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of light sources, and in particular relates to a coaxial parallel light source structure. Background Art

[0002] During the manufacturing process, scratches, indentations, bumps, wrinkles, marks, ripples and other defects may appear on the surface of cards, flat hardware, and flat reflective objects (such as plexiglass, ceramics, etc.). Usually, defect detection equipment with coaxial light source is used to detect defects in order to realize product quality detection.

[0003] In the prior art, the utility model with application number 202122812991.1 discloses a coaxial parallel light source structure, including a box body and a point light source, a photographing port and a light source port are arranged side by side on one side of the box body, a lampshade is mounted on the light source port, a point light source is installed on the upper side of the lampshade, and a Fresnel lens is installed on the lower side, a beam splitter and a reflector are arranged obliquely on the lower sides of the photographing port and the light source port in the box body, the beam splitter and the reflector are parallel to each other, a detection port is arranged on the other side of the box body, and the detection port and the photographing port are colinearly distributed on both sides of the beam splitter, in the existing coaxial parallel light source structure, although the detection port is arranged on the lower side of the photographing port and the light source port, the detection port is arranged on the lower side of the photographing port and the light source port, The camera and the point light source are located in the same position, which effectively reduces the space occupied by the overall coaxial light source detection structure. However, it is not difficult to find that the distance between the point light source and the Fresnel lens is fixed, so that the incident angle of the light to the Fresnel lens is fixed, resulting in a fixed degree of diffusion of the parallel light refracted by the Fresnel lens. When detecting cards, flat hardware, and flat reflective objects, it is often necessary to adjust the light according to the reflective properties of the object surface. As a result, the existing coaxial parallel light source structure has certain limitations for the detection of objects. For this reason, the present application proposes a coaxial parallel light source structure. Utility Model Content

[0004] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a coaxial parallel light source structure, aiming to solve the technical problem that the incident angle of the light of the coaxial parallel light source structure to the Fresnel lens is fixed and the flexibility is low in the prior art.

[0005] Technical Solution

[0006] In order to solve the above technical problems, the utility model provides a coaxial parallel light source structure, including a box body, a Fresnel lens is arranged at one end of the top of the box body; a point light source is arranged above the Fresnel lens; a driving mechanism is arranged on the box body for driving the point light source to move closer to or away from the Fresnel lens, and the driving mechanism includes: a fixed arm vertically fixed to the box body, a cross bar slidably arranged on one side of the fixed arm, a slider slidably embedded in the fixed arm, a lead screw vertically rotatably installed in the fixed arm, and a motor installed on the fixed arm for driving the lead screw to rotate, the two ends of the cross bar are respectively connected to the point light source and the slider, and the lead screw thread passes through the slider.

[0007] Preferably, a sliding cavity is provided in the top of the fixed arm, a sliding groove is provided on the side of the fixed arm facing the point light source, the sliding groove is connected to the sliding cavity, the cross bar is passed through the sliding groove, the slider is slidably embedded in the sliding cavity, and the screw is rotatably installed in the sliding cavity.

[0008] Preferably, a reflector is obliquely arranged at a position close to the Fresnel lens in the box, a beam splitter is arranged at one end of the box away from the Fresnel lens, the beam splitter is parallel to the reflector, and a photo-taking port and a detection port are respectively provided on the top wall and the bottom wall at the corresponding positions of the box and the beam splitter, and light-transmitting lenses are embedded in the photo-taking port and the detection port.

[0009] Preferably, a lampshade is provided on the point light source, a sleeve is fixed on the box at a position corresponding to the Fresnel lens, and the bottom end of the lampshade is embedded in the sleeve.

[0010] Preferably, a ring seat is provided at the bottom end of the lampshade, a sealing rubber ring is sleeved on the ring seat, and the sealing rubber ring is sealed and fitted with the inner wall of the sleeve.

[0011] Preferably, a collar is provided at one end of the crossbar away from the fixed arm, a pair of retaining rings are provided on the outer shell wall of the point light source, and the collar is nested between the pair of retaining rings.

[0012] Preferably, a rubber gasket is provided on the inner wall of the collar, and the collar and the rubber gasket are both divided into two halves, one section of the collar is fixedly connected to the cross bar, one end of the two sections of the collar are hinged to each other, and the other ends of the two sections of the collar are bolted.

[0013] Beneficial Effects

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model cooperates with a point light source, a Fresnel lens, a reflector and a beam splitter. The light emitted by the point light source is dispersed into parallel light by the Fresnel lens and emitted to the reflector. The parallel light is reflected by the reflector and emitted to the beam splitter. Then, it is reflected by the beam splitter and emitted out of the detection port, so as to monitor the object under the detection port. Moreover, the detection camera can take pictures of the detection object through the beam splitter through the photo port, and the overall structure is reasonable.

[0016] In the utility model, through the setting of the point light source and the driving mechanism, the starting motor drives the screw to rotate, drives the slider to slide and rise and fall along the sliding cavity, drives the cross bar and the point light source to rise and fall, and can adjust the distance between the point light source and the Fresnel lens, so that the incident angle of the light emitted to the Fresnel lens is changed, thereby changing the focal length of the Fresnel lens, and adjusting the convergence or diffusion of the emitted parallel light. It has high flexibility to meet different detection needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the point light source and the driving mechanism of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the point light source and the lampshade in the utility model;

[0021] Figure 4 It is a structural schematic diagram of the driving mechanism in the utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the sliding cavity in the utility model;

[0023] Figure 6 It is a schematic diagram of the internal structure of the box in the utility model.

[0024] The markings in the attached drawings are: 1. box body; 2. point light source; 3. driving mechanism; 4. lampshade; 5. sleeve; 6. camera port; 7. light-transmitting lens; 8. ring seat; 9. sealing rubber ring; 10. retaining ring; 11. fixed arm; 12. cross bar; 13. sleeve ring; 14. rubber gasket; 15. slide groove; 16. motor; 17. slide cavity; 18. slider; 19. screw rod; 20. Fresnel lens; 21. reflector; 22. spectroscope; 23. detection port. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] This embodiment provides a coaxial parallel light source structure, and its structural schematic diagram is as follows Figure 1 - Figure 6 As shown, it includes a box body 1, a Fresnel lens 20 is arranged at one end of the top of the box body 1; a point light source 2 is arranged above the Fresnel lens 20; and a driving mechanism 3 is arranged on the box body 1 for driving the point light source 2 to move close to or away from the Fresnel lens 20, wherein a reflector 21 is obliquely arranged at a position close to the Fresnel lens 20 in the box body 1, a beam splitter 22 is arranged at one end of the box body 1 away from the Fresnel lens 20, and the beam splitter 22 is parallel to the reflector 21, and the top wall and bottom of the box body 1 at the corresponding position of the beam splitter 22 are arranged at the same time. A photographing port 6 and a detection port 23 are respectively provided on the wall, and a light-transmitting lens 7 is embedded in both the photographing port 6 and the detection port 23. Through this structural method, the light emitted by the point light source 2 is dispersed into parallel light rays through the Fresnel lens 20 and emitted to the reflector 21. The parallel light rays are reflected by the reflector 21 and emitted to the beam splitter 22, and then reflected by the beam splitter 22 and emitted from the detection port 23, which is used for monitoring the object below the detection port 23. In addition, the detection camera can take photos and detect the detection object through the photographing port 6 through the beam splitter 22. The driving mechanism 3 drives the point light source 2 to rise and fall, adjusts the distance between the point light source 2 and the Fresnel lens 20, changes the incident angle of the light emitted to the Fresnel lens 20, and then changes the focal length of the Fresnel lens 20, and adjusts the convergence or diffusion of the emitted parallel light rays, which has high flexibility.

[0027] Furthermore, the tilt angles of the reflector 21 and the beam splitter 22 are preferably set to 45°.

[0028] As a preferred technical solution in this embodiment, the driving mechanism 3 includes: a fixed arm 11 vertically fixed on the box body 1, a cross bar 12 slidably arranged on one side of the fixed arm 11, a slider 18 slidably embedded in the fixed arm 11, a screw rod 19 vertically rotatably installed in the fixed arm 11, and a motor 16 installed on the fixed arm 11 for driving the screw rod 19 to rotate, the two ends of the cross bar 12 are respectively connected to the point light source 2 and the slider 18, the screw rod 19 threadedly penetrates the slider 18, wherein a sliding cavity 17 is opened at the top of the fixed arm 11, and a sliding groove 15 is opened on the side of the fixed arm 11 facing the point light source 2, the sliding groove 15 is connected to the sliding cavity 17, the cross bar 12 is penetrated at the sliding groove 15, the slider 18 is slidably embedded in the sliding cavity 17, and the screw rod 19 is rotatably installed in the sliding cavity 17. The starting motor 16 drives the screw rod 19 to rotate, drives the slider 18 to slide and rise along the sliding cavity 17, drives the cross bar 12 and the point light source 2 to rise and fall, and adjusts the distance between the point light source 2 and the Fresnel lens 20, so as to change the focal length of the Fresnel lens 20 and adjust the purpose of focusing or diffusing the emitted parallel light rays.

[0029] Furthermore, in the present embodiment, a lampshade 4 is provided on the point light source 2, and a sleeve 5 is fixed on the box body 1 at a position corresponding to the Fresnel lens 20. The bottom end of the lampshade 4 is engaged with the sleeve 5. The lampshade 4 is used to gather the light emitted by the point light source 2. The sleeve 5 is used to cooperate with the lifting and lowering adjustment of the point light source 2. A ring seat 8 is provided at the bottom end of the lampshade 4. A sealing rubber ring 9 is sleeved on the ring seat 8. The sealing rubber ring 9 is sealed to the inner wall of the sleeve 5. The ring seat 8 and the sealing rubber ring 9 can make the lampshade 4 and the sleeve 5 sealed to prevent interference from external light sources.

[0030] Furthermore, in the present embodiment, a ring 13 is provided at one end of the cross bar 12 away from the fixed arm 11, and a pair of retaining rings 10 are provided on the outer shell wall of the point light source 2, and the ring 13 is nested between the pair of retaining rings 10, wherein a rubber gasket 14 is provided on the inner wall of the ring 13, and the ring 13 and the rubber gasket 14 are both divided into two sections in half, wherein one section of the ring 13 is fixedly connected to the cross bar 12, one ends of the two sections of the ring 13 are hinged to each other, and the other sections of the two sections of the ring 13 are bolted, and this structural method can facilitate the assembly and connection between the cross bar 12 and the point light source 2.

[0031] Working principle: When in use, the light emitted by the point light source 2 is dispersed into parallel light through the Fresnel lens 20 and directed to the reflector 21. The parallel light is reflected by the reflector 21 and directed to the beam splitter 22, and then reflected by the beam splitter 22 and directed to the detection port 23, which is used to monitor the object below the detection port 23. In addition, the detection camera can take photos of the detection object through the beam splitter 22 through the photo port 6. Furthermore, by starting the motor 16 to drive the screw 19 to rotate, the slider 18 is driven to slide and rise along the slide cavity 17, and the cross bar 12 and the point light source 2 are driven to rise and fall, and the distance between the point light source 2 and the Fresnel lens 20 can be adjusted, so that the incident angle of the light directed to the Fresnel lens 20 is changed, and then the focal length of the Fresnel lens 20 is changed, and the emitted parallel light is adjusted to gather or diffuse, which has high flexibility to meet different detection needs.

[0032] All technical features in this embodiment can be freely combined according to actual needs.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coaxial parallel light source structure, characterized in that: include: A box body (1), wherein a Fresnel lens (20) is arranged at one end of the top of the box body (1); A point light source (2) disposed above the Fresnel lens (20); A driving mechanism (3) is arranged on the box (1) and is used to drive the point light source (2) to move closer to or farther from the Fresnel lens (20). The driving mechanism (3) comprises: A fixed arm (11) vertically fixed on a box body (1), a cross bar (12) slidably arranged on one side of the fixed arm (11), a slider (18) slidably embedded in the fixed arm (11), a screw rod (19) vertically rotatably installed in the fixed arm (11), and a motor (16) installed on the fixed arm (11) for driving the screw rod (19) to rotate, wherein the two ends of the cross bar (12) are respectively connected to the point light source (2) and the slider (18), and the screw rod (19) is threadedly inserted through the slider (18).

2. A coaxial parallel light source structure according to claim 1, characterized in that: A sliding cavity (17) is provided at the top of the fixed arm (11), a sliding groove (15) is provided on a side of the fixed arm (11) facing the point light source (2), the sliding groove (15) is connected to the sliding cavity (17), the cross bar (12) is inserted into the sliding groove (15), the sliding block (18) is slidably embedded in the sliding cavity (17), and the screw rod (19) is rotatably installed in the sliding cavity (17).

3. The coaxial parallel light source structure according to claim 1, characterized in that: A reflector (21) is obliquely arranged at a position close to the Fresnel lens (20) in the box (1), a beam splitter (22) is arranged at one end of the box (1) away from the Fresnel lens (20), and the beam splitter (22) is parallel to the reflector (21). A photographing port (6) and a detection port (23) are respectively provided on the top wall and the bottom wall at positions corresponding to the beam splitter (22), and a light-transmitting lens (7) is embedded in both the photographing port (6) and the detection port (23).

4. The coaxial parallel light source structure according to claim 1, characterized in that: The point light source (2) is provided with a lampshade (4), a sleeve (5) is fixed at a position on the box (1) corresponding to the Fresnel lens (20), and the bottom end of the lampshade (4) is engaged with the sleeve (5).

5. The coaxial parallel light source structure according to claim 4, characterized in that: A ring seat (8) is arranged at the bottom end of the lampshade (4), a sealing rubber ring (9) is sleeved on the ring seat (8), and the sealing rubber ring (9) is sealed and fitted with the inner wall of the sleeve (5).

6. The coaxial parallel light source structure according to claim 1, characterized in that: A collar (13) is provided at one end of the crossbar (12) away from the fixed arm (11); a pair of retaining rings (10) are provided on the outer shell wall of the point light source (2); and the collar (13) is nested between the pair of retaining rings (10).

7. The coaxial parallel light source structure according to claim 6, characterized in that: A rubber pad (14) is arranged on the inner wall of the collar (13), and the collar (13) and the rubber pad (14) are both divided into two halves, one of which is fixedly connected to the cross bar (12), one end of the two collars (13) is hinged to each other, and the other ends of the two collars (13) are connected by bolts.

Images