Direct type dome light source and line scanning detection module

Abstract

The invention relates to a direct reflection dome light source, which comprises a base, a lamp holder plate and a lamp tube; the base is provided with a light hole and a side plate at the end; the lamp holder plate is circular arc-shaped and comprises two groups arranged symmetrically in the form of a dome; the lower end of the lamp holder plate is connected to the base and the upper end is connected to the side plate; the lamp tube comprises several lamp tubes, which are divided into two groups and are installed on the two groups of lamp holder plates respectively; the side plate is provided with two vertically arranged second waist-shaped holes, and the upper end of the lamp holder plate is connected to the corresponding second waist-shaped hole through a second bolt and nut connecting piece; the base is provided with a first waist-shaped hole, which is parallel to the lamp holder plate, and the lower end of the lamp holder plate is connected to the first waist-shaped hole through a first bolt and nut connecting piece. The light source designed by the invention has the advantages of simple structure, low cost, convenient disassembly, simple maintenance, open mechanism without special heat dissipation mechanism, light path fine adjustment, reflection to direct reflection and high energy utilization rate.

Description

Technical Field

[0001] This invention belongs to the field of visual inspection technology, specifically relating to a direct-type dome light source and a line scan inspection module. Background Technology

[0002] In the trend of intelligent manufacturing, intelligent engineering, and digitalization, machine vision inspection is needed in all production stages of factories. The inspection of large-format products relies on line scan cameras and line scan light sources. With the widespread adoption of deep learning algorithms, the detection of product appearance defects can be significantly simplified using deep learning. Line scan cameras and line scan light sources are a common combination with deep learning algorithms. Reducing the cost of diffuse reflection line scan light sources can further reduce the need for machine vision in engineering, thus facilitating the digital and intelligent transformation of factories.

[0003] Existing line scan cameras mostly use dome-type diffuse reflection light sources (such as patent applications CN214369563U - dome light source, CN105847640A - light source used in multi-line scan CCD cameras, CN113155737A - imaging device, etc.). Figure 6 As shown, the lighting principles are largely the same: light emitted by high-brightness LED beads is reflected onto the surface of the object being detected through the diffuse reflection of the dome surface. Because the inner surface of the dome is not specular but diffuse, the reflection efficiency is low. Therefore, to ensure brightness after reflection, this light source typically requires high-power LED beads powered by a high-power DC power supply. Furthermore, due to the high density of LED beads and their significant heat generation, a dedicated heat dissipation structure and cooling fan are needed to assist in cooling the LED beads; otherwise, brightness maintenance will be affected. Circular or arc-shaped domes are generally made of metal with a coating. The metal parts are usually die-cast in one piece, so manufacturing such light sources requires first "mold making" (creating a die-casting model). Therefore, the manufacturing process is lengthy, and adjustments to the light source design are complex and costly (each adjustment requires re-mold making).

[0004] Existing line scan dome light sources generate significant heat, have low energy efficiency and high energy consumption, and are large and bulky. This is especially problematic for line scan cameras, which are often used to inspect wide-area objects, requiring a long light source; they also require a dedicated power supply, and the controller is bulky. In summary, existing line scan dome light sources are cumbersome to manufacture, costly to process, difficult to maintain, and expensive to repair. Furthermore, the reflective curved surface (dome) cannot be adjusted, and once the design is finalized, it cannot be changed, making process replication and customization difficult. Summary of the Invention

[0005] The purpose of this invention is to provide a direct-light dome light source that is simple in structure, easy to use, and inexpensive.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A direct-light dome light source, characterized in that it comprises:

[0008] A base, wherein a light-transmitting hole is provided on the base and a side plate is provided at the end;

[0009] The lamp base plate is arc-shaped and consists of two sets arranged symmetrically in a dome shape; the lower end of the lamp base plate is connected to the base and the upper end is connected to the side plate.

[0010] The lamp tubes consist of several tubes, divided into two groups, and installed on two sets of lamp holder plates respectively.

[0011] Furthermore, the side plate is provided with two vertically arranged second waist-shaped holes, and the upper end of the lamp holder plate is connected to the corresponding second waist-shaped hole through a second bolt and nut connector.

[0012] Furthermore, the base is provided with a first waist-shaped hole, the direction of which is parallel to the lamp holder plate, and the lower end of the lamp holder plate is connected to the first waist-shaped hole through a first bolt and nut connector.

[0013] Furthermore, the lamp holder plate is provided with a third oblong hole, and the lamp tube is connected to the lamp holder plate through a bolt and nut assembly in conjunction with the third oblong hole.

[0014] Furthermore, the bolt and nut assembly includes a screw rod equipped with two locking nuts, which clamp the lamp holder plate to achieve connection, and the end of the screw rod is connected to the lamp tube.

[0015] Furthermore, the end of the screw is provided with a buckle, which engages with the lamp tube.

[0016] Furthermore, each group of lamps comprises at least three lamps.

[0017] Furthermore, the lamp tube is an LED fluorescent tube, a fluorescent lamp, or an LED light strip.

[0018] Furthermore, each end of the light-transmitting hole is provided with a side plate, and each set of lamp holder plates consists of two pieces, which are respectively connected to the side plates at both ends of the light-transmitting hole and to both ends of the lamp tube.

[0019] A line scan detection module, characterized in that: it includes the above-mentioned direct dome light source and line scan camera, wherein the line scan camera is located directly above the direct dome light source, and the scanning surface of the line scan camera passes through the gap between two sets of lamp tubes and the light-transmitting hole to hit the detection surface of the product being inspected.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The light source designed in this invention has a simple structure, is assembled with standard parts, and has low cost; the process is simple and the production cycle is short; the design is easy to disassemble and easy to maintain; the open mechanism does not require a special heat dissipation mechanism; the flexible design allows for fine adjustment of the light path of the light source; it changes reflection to direct light, resulting in high energy utilization; the fluorescent lamp has excellent color reproduction; and it is lightweight. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the direct-light dome light source in the embodiment.

[0022] Figure 2 This is a three-dimensional schematic diagram of the embodiment.

[0023] Figure 3 This is a three-dimensional schematic diagram of the embodiment.

[0024] Figure 4 This is a three-dimensional schematic diagram of the embodiment.

[0025] Figure 5 This is a three-dimensional schematic diagram of the line scan detection module in the embodiment.

[0026] Figure 6 This is a schematic diagram of the principle of existing dome light sources in the background technology.

[0027] In the diagram, 11 is the base; 12 is the side plate; 13 is the light-transmitting hole; 14 is the first waist-shaped hole; 15 is the second waist-shaped hole; 21 is the lamp holder plate; 22 is the screw; 23 is the buckle; 24 is the locking nut; 25 is the second bolt and nut connector; 26 is the first bolt and nut connector; 27 is the third waist-shaped hole; 31 is the lamp tube; and 41 is the line scan camera. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, the direct-light dome light source mainly includes a base 11, a lamp holder plate 21, and a lamp tube 31.

[0030] like Figure 2 , 3As shown, the base 11 is a rectangular plate structure with a rectangular light-transmitting hole 13 at the center along its length. Side plates 12 are provided at both ends of the light-transmitting hole 13, and two vertically arranged second waist-shaped holes 15 are provided on the side plates 12. The base 11 also has four first waist-shaped holes 14 (perpendicular to the length of the light-transmitting hole 13), which are located at the left and right ends of the front and rear sides of the light-transmitting hole 13, respectively. The entire base 11 structure is symmetrical in front, back, left, and right.

[0031] like Figure 1 As shown, the lamp holder plate 21 is arc-shaped and has a certain degree of elasticity; the lamp holder plate 21 includes two sets, with two pieces in each set; the two sets of lamp holder plates 21 are symmetrically arranged on the front and rear sides of the light-transmitting hole 13, forming a dome shape.

[0032] like Figure 2 As shown, the upper end of the lamp holder plate 21 is connected to the second waist-shaped hole 15 on the same side through the second bolt and nut connector 25, and the lower end of the lamp holder plate 21 is connected to the first waist-shaped hole 14 through the first bolt and nut connector 26.

[0033] like Figure 2 , 4 As shown, the lamp tube 31 is an LED fluorescent tube (a long strip lamp such as a fluorescent lamp or LED light strip), with a total of eight tubes, divided into two groups, and each group of lamp base plates 21 is equipped with four tubes.

[0034] The lamp holder plate 21 is provided with a third oblong hole 27. The lamp tube 31 is connected to the lamp holder plate 21 through the bolt and nut assembly in conjunction with the third oblong hole 27. The bolt and nut assembly includes a screw 22, which is equipped with two locking nuts 24. The connection is achieved by clamping the lamp holder plate 21 through the two locking nuts 24. The end of the screw 22 is connected to the lamp tube 31 through a buckle 23.

[0035] refer to Figure 2 The adjustment methods for direct-light dome lighting include:

[0036] (1) Adjusting the connection position between the second bolt and nut connector 25 and the side plate 12 can achieve the adjustment of the height of the lamp tube 31 and the curvature of the lamp holder plate 21;

[0037] (2) By adjusting the connection position of the first bolt and nut connector 26 and the base 11, the inner and outer parts of the lamp tube 31 and the curvature of the lamp holder plate 21 can be adjusted.

[0038] (3) Adjust the two locking nuts 24 and the screw 22. The length of the screw 22 extending inward can be adjusted, thereby adjusting the position of the lamp tube 31 extending inward.

[0039] (4) By adjusting the relative position of the screw 22 and the lamp holder plate 21 along the length direction, the lamp tube 31 can be adjusted along the circumference of the dome and the density of multiple lamp tubes 31 can be adjusted.

[0040] (5) As needed, the above (1), (2), (3), and (4) adjustments can be made simultaneously, or any combination of the above (1), (2), (3), and (4) adjustments can be made to ultimately achieve the all-round and three-dimensional adjustment requirements of the lamp tube 31.

[0041] like Figure 5 As shown, this solution also provides a line scan detection module, including the aforementioned direct-light dome light source and a line scan camera 41. The line scan camera 41 is located directly above the direct-light dome light source, and the scanning surface passes through the slit between the two sets of lamps 31 and the light-transmitting hole 13 to illuminate the detection surface of the product being inspected. Due to the characteristics of dome light, the light source cannot be too far from the object being inspected; keeping it within 100mm is more suitable.

[0042] Functional effects of this solution:

[0043] 1. This solution uses LED fluorescent tubes as the light-emitting device, employing multiple tubes to directly illuminate the object at close range, ensuring brightness without the energy loss associated with reflection. It also provides a similar lighting effect to diffused dome lighting, closely approximating ambient light with excellent color reproduction. Various tube lengths are available to suit different needs. Different colored tubes can also be selected as required.

[0044] 2. This solution uses a simple structural frame material for fixing (fixing method with bolt connection, all accessories are frame type design), which reduces the overall weight, increases permeability, and facilitates heat dissipation.

[0045] 3. The light source path of this solution can be finely adjusted, as described above for the adjustment method of the direct-light dome light source. The lamps can be flexibly adjusted as needed, such as left and right, up and down, angle, and density, thus achieving fine-tuning of the light path and changing the lighting mode.

[0046] 4. This solution is easy to maintain. The fluorescent tubes are fixed with clips. If a tube malfunctions, it can be removed without tools and replaced with a new tube of the same model to continue working. Maintenance and repair are very simple. Moreover, targeted replacement is possible and the cost is not high.

[0047] 5. Fluorescent lamps are all powered by 220V AC. The lamps are connected in series using standard fluorescent lamp wiring. No specific controller is required; a relay module with control functionality, in conjunction with the camera's I / O output, can be used to achieve a "strobe" lighting function. That is, the light source illuminates only when the camera begins exposure and turns off after the exposure ends. Standard relay modules can be used; relay modules with delay control functions can achieve more features. Specific implementation method: A photoelectric switch or other electrical device provides a trigger signal to the camera. Upon receiving the trigger signal, the camera outputs an I / O signal. This I / O signal is high during the camera's exposure and goes low after the exposure ends. This I / O signal controls the relay module of the light source, which illuminates the light source when it receives a high-level signal. The "strobe" lighting function reduces energy consumption, reduces heat generation, and extends lamp life.

[0048] 6. Typical dome lighting requires independent cooling fans and heat sinks, but the light source in this solution does not require consideration of heat dissipation. Firstly, it uses ordinary fluorescent tubes, whose heat dissipation is not a serious issue; secondly, the open structure allows for natural heat dissipation. If the "flicker" function is used, the tubes are often off, further eliminating the problem of overheating.

[0049] 7. Diverse selection of light sources (lamp fixtures). LED fluorescent lamps can be replaced with ordinary fluorescent lamps (fluorescent lamps), and the sizes are compatible; or LED light strips can be used directly (without a diffuse reflector cover; this can achieve the effect of increasing brightness).

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct- view, dome light source, characterized by, It includes: The base (11) is provided with a light hole (13), and the end is provided with a side plate (12); The lamp holder plate (21) is arc-shaped and includes two groups arranged symmetrically in the form of a dome; the lower end of the lamp holder plate (21) is connected to the base (11), and the upper end is connected to the side plate (12); The lamp tube (31) includes several equal parts divided into two groups and is installed on the two groups of lamp holder plates (21); The side plate (12) is provided with two vertically arranged second waist-shaped holes (15), and the upper end of the lamp holder plate (21) is connected to the corresponding second waist-shaped hole (15) through the second bolt-nut connecting piece (25); The base (11) is provided with a first waist-shaped hole (14) in the direction parallel to the lamp holder plate (21), and the lower end of the lamp holder plate (21) is connected to the first waist-shaped hole (14) through the first bolt-nut connecting piece (26); The lamp holder plate (21) is provided with a third waist-shaped hole (27), and the lamp tube (31) is connected to the lamp holder plate (21) through the bolt-nut assembly cooperating with the third waist-shaped hole (27).

2. The direct view dome light source of claim 1, wherein, The bolt-nut assembly includes a screw rod (22), which is provided with two locking nuts (24) to clamp the lamp holder plate (21) to achieve connection, and the end of the screw rod (22) is connected to the lamp tube (31).

3. The direct view dome light source of claim 2, wherein, The end of the screw rod (22) is provided with a buckle (23) which is connected to the lamp tube (31).

4. The direct view dome light source of claim 1, wherein, Each group of lamp tubes (31) includes at least three.

5. The direct view dome light of claim 1, wherein, The lamp tube (31) is a LED daylight lamp tube, a fluorescent lamp or a LED light bar.

6. The direct view dome light source of claim 1, wherein, Both ends of the light hole (13) are provided with side plates (12), each group of lamp holder plates (21) is two, which are connected to the side plates (12) at both ends of the light hole (13) and connected to both ends of the lamp tube (31).

7. A line-scan detection module, comprising: The direct type dome light source and the line scan camera (41) according to any one of claims 1-6 are included, the line scan camera (41) is located directly above the direct type dome light source, and the scanning surface of the line scan camera (41) passes through the gap between the two groups of lamp tubes (31) and the light hole (13) to hit the detection surface of the detected product.

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