Fog surface Fresnel lens focal length test equipment

Abstract

The utility model relates to the field of Fresnel lens performance testing, in particular to a fogging surface Fresnel lens focal length testing device, which comprises a bottom plate and a displacement mechanism, and is characterized in that a laser transmitter mounting mechanism, a lens mounting seat, a diffusion plate support and a camera support are sequentially arranged on the bottom plate from front to back; a laser transmitter is fixed on the laser transmitter mounting mechanism, the laser transmitter mounting mechanism is driven by a displacement mechanism to move, and the displacement mechanism is arranged at the top of the bottom plate; the lens mounting seat is fixed at the top of the bottom plate, and a matte Fresnel lens is mounted on the lens mounting seat; the diffusion plate bracket is fixed at the top of the bottom plate, and a diffusion plate is fixed on the diffusion plate bracket; the camera support is fixed to the top of the bottom plate and is fixedly provided with an industrial camera, the fogging surface Fresnel lens focal length testing equipment can carry out fogging surface Fresnel lens focal length testing, errors are small, automatic testing is achieved, and testing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of Fresnel lens performance testing equipment, and particularly relates to a foggy Fresnel lens focal length testing equipment. Background Art

[0002] The current main application fields of Fresnel lenses include projection and solar photovoltaic fields. Because the light rays emitted by Fresnel lenses are relatively soft at the edges, they are commonly used in dyeing lamps. A colored plastic film is placed on the bracket in front of the lens to dye the light, or a metal mesh or frosted plastic can be placed to disperse the light. Many devices containing Fresnel lenses allow the lamp to move back and forth around the focus to enlarge or reduce the size of the light beam, and it is very suitable for use in lens projectors, rear projection TVs, slide projectors, and collimators, not only because the light passing through it is brighter than that passing through ordinary lenses, but also because the brightness of the entire light beam passing through it is relatively consistent at each part.

[0003] In the current testing of the focal length of foggy Fresnel lenses, when a laser beam passes through a non-foggy Fresnel lens and projects onto a white diffuser plate, a bright spot with obvious brightness will be formed, and the center of the light spot can be roughly measured using a caliper; while when a laser beam passes through a foggy Fresnel lens and projects onto a white diffuser plate, a uniformly bright circular light spot will be formed, and the center of the light spot cannot be accurately located. Only the outline of the light spot can be manually drawn and then the center can be found, which is not conducive to measuring the focal length, and this testing process usually requires manual operation for alignment, resulting in low efficiency. Summary of the Utility Model

[0004] In the existing Fresnel lens focal length testing technology, the central value obtained from the focal length testing of foggy Fresnel lenses has a large error, the focal length testing result is inaccurate, and this process requires manual alignment of various components, resulting in low testing efficiency. To solve the above problems, the utility model provides a foggy Fresnel lens focal length testing equipment, which can perform the focal length testing of foggy Fresnel lenses with small errors and realize automated testing, thereby improving the testing efficiency.

[0005] The technical solution of the utility model is as follows:

[0006] A foggy Fresnel lens focal length testing equipment, comprising a bottom plate and a displacement mechanism. On the bottom plate, a laser emitter mounting mechanism, a lens mounting seat, a diffuser plate support, and a camera support are sequentially arranged from front to back;

[0007] A laser emitter is fixed on the laser emitter mounting mechanism, and the laser emitter mounting mechanism is driven by the displacement mechanism to move. The displacement mechanism is arranged on the top of the bottom plate;

[0008] The lens mounting seat is fixed on the top of the bottom plate, and a foggy Fresnel lens is installed on the lens mounting seat. The working end of the laser emitter faces the foggy Fresnel lens;

[0009] The diffusion plate bracket is fixed to the top of the bottom plate, and a diffusion plate is fixed thereto.

[0010] The camera bracket is fixed to the top of the bottom plate, and an industrial camera is fixed thereto.

[0011] Preferably, the displacement mechanism includes a first horizontal connecting plate, a first driving device, a second driving device and a connecting seat.

[0012] The first horizontal connecting plate is fixed to the top of the bottom plate, the first driving device is fixed to the top of the first horizontal connecting plate, the top of the moving end of the first driving device is fixedly connected with the connecting seat, and the connecting seat is driven by the first driving device to move left and right.

[0013] The second driving device is fixed to the connecting seat, and the moving end of the second driving device is fixedly connected with the laser emitter mounting mechanism.

[0014] Preferably, the laser emitter mounting mechanism includes a vertical connecting plate, a second horizontal connecting plate, a cage type XY translation adjustment frame and an adjustable collimation adapter.

[0015] The vertical connecting plate is fixedly connected with the second horizontal connecting plate, the front side of the second horizontal connecting plate is fixedly connected with the cage type XY translation adjustment frame, the adjustable collimation adapter is fixed inside the cage type XY translation adjustment frame, and the laser emitter is fixed to the adjustable collimation adapter.

[0016] The moving end of the second driving device is fixedly connected with the vertical connecting plate, and the second driving device drives the second horizontal connecting plate to move up and down.

[0017] Preferably, the first driving device is a first electric cylinder.

[0018] Preferably, the second driving device is a second electric cylinder.

[0019] Preferably, the lens mounting seat includes an L-shaped seat body and a mounting plate fixed to the top of the L-shaped seat body, and a mounting groove for mounting a matte Fresnel lens is formed on the mounting plate.

[0020] Preferably, the middle of the mounting plate bulges, and the mounting groove is arranged at the bulge.

[0021] Preferably, a pair of swing handles are hinged to the mounting plate, and the pair of swing handles are respectively located on both sides of the mounting groove.

[0022] Preferably, a frame is further included, and the bottom plate is fixed inside the frame.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model drives a laser emitter to reach a working position through the cooperation of a first electric cylinder and a second electric cylinder, and then conducts the focal length test of a matte Fresnel lens. The whole process does not require manual operation to adjust the position, and the test process is set in a frame composed of black acrylic plates, which can isolate external stray light. The overall test process is stable, which can improve the measurement accuracy and measurement speed. Brief Description of the Drawings

[0025] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 is a schematic diagram of the displacement mechanism, the laser emitter mounting mechanism and the lens mounting seat of the utility model

[0027] Figure 3 is Figure 1 an enlarged schematic diagram of the reference numeral A in

[0028] Figure 4 is a schematic diagram of the frame and its interior;

[0029] Figure 5 is a schematic diagram of the overall structure of the frame;

[0030] In the figure: 1 - bottom plate, 2 - displacement mechanism, 21 - first horizontal connecting plate, 22 - first electric cylinder, 23 - second electric cylinder, 24 - connecting seat, 3 - laser emitter mounting mechanism, 31 - second horizontal connecting plate, 32 - vertical connecting plate, 33 - cage-type XY translation adjustment frame, 34 - adjustable collimation adapter, 4 - lens mounting seat, 41 - L-shaped seat body, 42 - mounting plate, 43 - mounting groove, 44 - swing handle, 5 - diffuser plate bracket, 6 - diffuser plate, 7 - camera bracket, 8 - industrial camera, 9 - laser emitter, 10 - matte Fresnel lens, 11 - frame. Detailed Description of the Embodiment

[0031] The following will combine the drawings and specific embodiments to elaborate on the utility model in detail.

[0032] Refer to Figure 1 , a focal length test device for a matte Fresnel lens, including a bottom plate 1 and a displacement mechanism 2. The laser emitter mounting mechanism 3, the lens mounting seat 4, the diffuser plate bracket 5 and the camera bracket 7 are sequentially arranged on the bottom plate from front to back;

[0033] A laser emitter 9 is fixed on the laser emitter mounting mechanism 3, and the laser emitter mounting mechanism 3 is driven by the displacement mechanism 2 to move. The displacement mechanism 2 is arranged on the top of the bottom plate 1;

[0034] The lens mounting base 4 is fixed to the top of the bottom plate, and a matte Fresnel lens 10 is mounted on the lens mounting base 4;

[0035] The diffuser plate bracket 5 is fixed to the top of the bottom plate 1 and is fixed with a diffuser plate 6;

[0036] The camera bracket 7 is fixed to the top of the bottom plate 1 and is fixed with an industrial camera 8.

[0037] Specifically, the industrial camera 8 can be a CCD camera.

[0038] In an embodiment of the present invention, the displacement mechanism 2 includes a first horizontal connecting plate 21, a first driving device, a second driving device, and a connecting seat 24;

[0039] The first horizontal connecting plate 21 is fixed to the top of the bottom plate 1, the first driving device is fixed to the top of the first horizontal connecting plate 21, the top of the moving end of the first driving device is fixedly connected to the connecting seat 24, and the connecting seat 24 is driven by the first driving device to move left and right; the second driving device is fixed to the connecting seat 24, and the moving end of the second driving device is fixedly connected to the laser emitter mounting mechanism 3.

[0040] On the basis of the previous embodiment, the laser emitter mounting mechanism 3 includes a vertical connecting plate 32, a second horizontal connecting plate 31, a cage type XY translation adjustment frame 33, and an adjustable collimation adapter 34;

[0041] The moving end of the second driving device is fixedly connected to the vertical connecting plate 32, and the second driving device drives the second horizontal connecting plate 31 to move up and down;

[0042] The vertical connecting plate 32 is fixedly connected to the second horizontal connecting plate 31, the front side of the vertical connecting plate 32 is fixedly connected to the cage type XY translation adjustment frame 33, the adjustable collimation adapter 34 is fixed inside the cage type XY translation adjustment frame 33, and the laser emitter 9 is fixed on the adjustable collimation adapter 34.

[0043] In this embodiment, the adjustable collimation adapter 34 can be a cage type XY translation adjustment frame of Guangzhou Base Optoelectronic Technology Co., Ltd., and its model is OAD-12F; the cage type XY translation adjustment frame 33 can be a cage type XY translation adjustment frame of Guangzhou Base Optoelectronic Technology Co., Ltd., and its model is CXY1-M.

[0044] See Figure 1-2 , in an embodiment of the present invention, the first driving device is a first electric cylinder 22, and the second driving device is a second electric cylinder 23.

[0045] During operation, the moving end of the first electric cylinder 22 drives the connecting seat 24 to move left and right, thereby driving the second electric cylinder 23 fixedly connected to the connecting seat 24 to move. The moving end of the second electric cylinder 23 drives the second horizontal connecting plate to move up and down, and further drives the vertical connecting plate 32, the cage-type XY translation adjustment frame 33, the adjustable collimation adapter 34 and the laser emitter 9 to move up and down. Through the cooperation of the first electric cylinder 22 and the second electric cylinder 23, the laser emitter 9 can be driven to reach the working position.

[0046] See Figure 1-2 , in an embodiment of the present invention, the lens mounting seat includes an L-shaped seat body 41 and a mounting plate 42 fixed to the top of the L-shaped seat body. An installation groove 43 for installing the matte Fresnel lens 10 is provided on the mounting plate 42.

[0047] Furthermore, the middle of the mounting plate 42 protrudes, and the installation groove 43 is provided at the protrusion.

[0048] See Figure 1-3 , on the basis of the previous embodiment, a pair of swing handles 44 are hinged on the mounting plate 42. The pair of swing handles 44 are respectively located on both sides of the installation groove 43. Turning the pair of swing handles 44 to the position of the installation groove 43 to limit the matte Fresnel lens 10 can realize the pressing and fixing of the matte Fresnel lens 10.

[0049] Figure 4-5 , in an embodiment of the present invention, it further includes a frame 11. The bottom plate 1 is fixed inside the frame 11. The frame is composed of black acrylic plates and can isolate external stray light.

[0050] The working principle of the present invention is as follows:

[0051] Place the matte Fresnel lens 10 into the installation groove 43, rotate the swing handle 44 to press the matte Fresnel lens 10, start the first electric cylinder 22 and the second electric cylinder 23 to drive the laser emitter 9 to move to the specified position. The laser beam emitted by the laser emitter 9 passes through the matte Fresnel lens 10 and projects onto the diffusion plate 6 to form an approximately circular light spot. The CCD camera takes a photo of the light spot. The edge of the light spot image is relatively blurred. The processor performs binary processing on the image, and the processed picture becomes a special black-and-white grayscale image with only black and white.

[0052] Perform filtering and denoising processing on the binary grayscale image. First, use smoothing filtering to process the surrounding noise points, and then use median filtering to remove the granular noise points in the light spot. The edge of the light spot becomes smooth and clear.

[0053] Perform edge detection on the processed image, obtain the boundary points of the fitted circle, establish an X-Y coordinate system with the upper left corner as the coordinate origin, detect the edge points of the light spot according to the edge detection algorithm, and select appropriate points for fitting.

[0054] The center error of the light spot calculated by a single circle fitting is relatively large. To reduce the error, multiple fittings are required to improve the accuracy. Finally, the center of the light spot is calculated by circle fitting based on the least square principle, so as to obtain the focusing performance data of the matte Fresnel lens 10 with high accuracy. The above image processing technology and calculation process are conventional technologies in this field.

[0055] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A frosted Fresnel lens focal length testing device, characterized in that: It comprises a bottom plate and a displacement mechanism, wherein the bottom plate is provided with a laser transmitter mounting mechanism, a lens mounting seat, a diffusion plate bracket and a camera bracket in sequence from front to back; The laser emitter mounting mechanism is fixed with a laser emitter, and the laser emitter mounting mechanism is driven to move by a displacement mechanism, and the displacement mechanism is arranged on the top of the bottom plate; The lens mounting seat is fixed to the top of the bottom plate, a frosted Fresnel lens is mounted on the lens mounting seat, and the working end of the laser transmitter faces the frosted Fresnel lens; The diffuser plate bracket is fixed to the top of the bottom plate and is fixed with a diffuser plate; The camera bracket is fixed on the top of the bottom plate and is fixed with an industrial camera.

2. The frosted Fresnel lens focal length testing device according to claim 1, characterized in that: The displacement mechanism comprises a first transverse connecting plate, a first driving device, a second driving device and a connecting seat; The first transverse connecting plate is fixed to the top of the bottom plate, the first driving device is fixed to the top of the first transverse connecting plate, the top of the moving end of the first driving device is fixedly connected to the connecting seat, and the connecting seat is driven by the first driving device to move left and right; The second driving device is fixed on the connecting seat, and the moving end of the second driving device is fixedly connected to the laser emitter mounting mechanism.

3. The frosted Fresnel lens focal length testing device according to claim 2, characterized in that: The laser transmitter mounting mechanism includes a vertical connecting plate, a second transverse connecting plate, a cage-type XY translation adjustment frame and an adjustable alignment adapter; The vertical connecting plate is fixedly connected to the second horizontal connecting plate, the front side of the second horizontal connecting plate is fixedly connected to the cage-type XY translation adjustment frame, the adjustable collimation adapter is fixed inside the cage-type XY translation adjustment frame, and the laser transmitter is fixed on the adjustable collimation adapter; The moving end of the second driving device is fixedly connected to the vertical connecting plate, and the second driving device drives the second transverse connecting plate to move up and down.

4. The frosted Fresnel lens focal length testing device according to claim 3, characterized in that: The first driving device is a first electric cylinder.

5. The frosted Fresnel lens focal length testing device according to claim 4, characterized in that: The second driving device is a second electric cylinder.

6. The frosted Fresnel lens focal length testing device according to claim 1, characterized in that: The lens mounting seat comprises an L-shaped seat body and a mounting plate fixed on the top of the L-shaped seat body, and the mounting plate is provided with a mounting groove for mounting the fogged Fresnel lens.

7. The frosted Fresnel lens focal length testing device according to claim 6, characterized in that: The middle part of the mounting plate is protruded, and the mounting groove is arranged at the protrusion.

8. The focal length testing device for a frosted Fresnel lens according to claim 6, characterized in that: A pair of swing handles are hinged on the mounting plate, and the pair of swing handles are respectively located on both sides of the mounting groove.

9. The focal length testing device for a frosted Fresnel lens according to claim 1, characterized in that: The utility model also comprises a frame, and the base plate is fixed inside the frame.

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