Backlight source and detection device
By setting infrared and visible light LEDs in the backlight and using a total reflection tube and diffuser plate, the switching between infrared and visible light is achieved, solving the problem that existing backlights can only emit one type of light and improving the applicability of the detection device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-03-31
AI Technical Summary
Existing backlights can only emit one type of light, which cannot meet the detection requirements that require both infrared backlighting and visible backlighting.
Design a backlight source comprising a first lamp board and a second lamp board. Infrared LEDs are mounted on the first lamp board, and visible LEDs are mounted on the second lamp board. The switching between infrared and visible light is achieved through a total reflection tube and a diffuser.
The ability to switch between infrared and visible light under the same backlight increases the applicability of the detection device, avoids bright spot phenomena, and reduces light loss.
Smart Images
Figure CN224065329U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of light source structure, and in particular to a backlight and detection device. Background Technology
[0002] Currently, the market demands increasingly stringent product quality standards. During the manufacturing process, products need to be inspected from multiple aspects to eliminate defective items and improve overall quality. Based on these objectives, product defect detection technology is widely used across various industries. As a key component of the detection system, the light source has a significant impact on improving detection quality.
[0003] Commonly used light sources include front light sources and backlights. A backlight consists of a housing and a light panel. The light panel includes a circuit board and several LEDs mounted on it. The LEDs emit light, which is diffused by a diffuser plate and then directed onto the bottom of the workpiece, forming the backlight in visual inspection. Existing backlights generally only emit one type of light: either infrared light or visible light. In some inspection scenarios, it is necessary to inspect workpieces under both infrared and visible light backlights, and current backlight technologies cannot meet these requirements.
[0004] Therefore, it is necessary to design a backlight and a detection device to improve the applicability of the backlight.
[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content
[0006] This invention provides a backlight source and a detection device that can provide both infrared backlight and visible backlight, effectively expanding its applicability.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A backlight, comprising:
[0009] case;
[0010] The first lamp board includes a first circuit board and an array of infrared lamp beads mounted on the first circuit board;
[0011] The second lamp board is disposed on the light-emitting side of the second lamp board, and includes a second circuit board and an array of visible light lamp beads mounted on the second circuit board;
[0012] A total reflection tube is installed on the first circuit board, the infrared light bulb is located in the total reflection tube, the reflection tube passes through the second circuit board, and a diffuser plate is also installed on the light-emitting side of the second lamp board.
[0013] Optionally, the second circuit board is provided with a tapered positioning hole;
[0014] The total reflection cylinder includes a cylindrical part and a horn part connected to the cylindrical part. The bottom of the cylindrical part abuts against and fits against the first circuit board, and the wall of the conical positioning hole fits against the outer periphery of the horn part.
[0015] Both the inner wall surface of the cylindrical section and the inner wall surface of the horn section are total reflection surfaces.
[0016] Optionally, the horn-shaped cylindrical portion forms a horn-shaped inner bore wall surface;
[0017] The center lines of the horn-shaped section and the cylindrical section coincide.
[0018] Optionally, the first circuit board, the second circuit board, and the diffuser are arranged at intervals in a vertically upward direction, and the first circuit board and the second circuit board are both parallel to the diffuser.
[0019] Optionally, the housing includes a base plate and side plates fixedly connected to the base plate;
[0020] The side plate is provided with a limiting protrusion, and the limiting protrusion and the bottom plate are spaced apart to form a slot for clamping the first circuit board.
[0021] Optionally, the second circuit board is mounted on the limiting protrusion.
[0022] Optionally, the bottom of the housing has a plurality of heat dissipation strips.
[0023] A detection device includes a backlight source as described in any of the preceding claims.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] The backlight and detection device provided by this utility model provide infrared backlighting. When infrared backlighting is required, infrared LEDs mounted on the first circuit board emit light, which passes through a total reflection tube to a diffuser plate, and then through the diffuser plate to the workpiece, thus forming infrared backlighting. When visible light backlighting is required, visible light LEDs mounted on the second circuit board emit light, which directly passes through the diffuser plate to the workpiece, thus forming visible light backlighting. It should also be noted that the backlight should not have bright spots, and infrared light has stronger penetration. In this embodiment, the infrared LEDs are positioned further away, and light loss is reduced through a total reflection tube, thus enabling two types of backlighting to be achieved with a single backlight source.
[0026] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description
[0027] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a top view schematic diagram of the backlight provided in an embodiment of the present utility model;
[0029] Figure 2 yes Figure 1 A schematic diagram of light emission when the visible light LED is emitting light from the AA cross-section of the backlight.
[0030] Figure 3 yes Figure 1 A schematic diagram of the light output when the infrared lamp bead emits light in the AA cross section of the backlight.
[0031] Reference numerals: 1. Housing; 2. First lamp board; 21. First circuit board; 22. Infrared lamp bead; 3. Second lamp board; 301. Conical positioning hole; 31. Second circuit board; 32. Visible light bead; 4. Total reflection cylinder; 41. Cylindrical section; 42. Horn section; 5. Diffuser plate; 51. Base plate; 52. Side plate; 521. Limiting protrusion; 522. Slot; 53. Heat dissipation strip. Detailed Implementation
[0032] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.
[0033] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0034] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.
[0035] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.
[0036] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.
[0037] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.
[0038] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.
[0039] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0040] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances. Example 1
[0041] In view of the aforementioned defects in existing backlights, the applicant, based on years of extensive practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, has actively conducted research and innovation in order to create a backlight that can overcome the defects in the existing technology and make it more practical. After continuous research, design, and repeated prototype production and improvement, this utility model with real practical value has finally been created.
[0042] Please refer to Figures 1 to 3 This utility model embodiment provides a backlight source, including: a housing 1; a first lamp board 2, including a first circuit board 21 and an array of infrared LED beads 22 mounted on the first circuit board 21; a second lamp board 3, disposed on the light-emitting side of the second lamp board 3, including a second circuit board 31 and an array of visible light LED beads 32 mounted on the second circuit board 31; a total reflection tube 4 is installed on the first circuit board 21, the infrared LED beads 22 are located in the total reflection tube 4, the reflection tube passes through the second circuit board 31, and a diffuser plate 5 is also installed on the light-emitting side of the second lamp board 3.
[0043] In this embodiment, when infrared backlighting is required, infrared LED beads 22 mounted on the first circuit board 21 emit light, and the light passes through the total reflection tube 4 and is directed to the diffuser plate 5, and then through the diffuser plate 5 to the workpiece, thereby forming infrared backlighting; when visible light backlighting is required, visible light LED beads 32 mounted on the second circuit board 31 emit light, and the light is directed directly to the diffuser plate 5, and then through the diffuser plate 5 to the workpiece, thereby forming visible light backlighting.
[0044] It should also be noted that while the backlight should not exhibit bright spots, infrared light has stronger penetrating power. Therefore, when infrared LEDs 22 and visible light LEDs 32 are placed on the same circuit board, and the visible light LEDs 32 can emit light normally, the infrared LEDs 22 will easily form bright spots. In this embodiment, the infrared LEDs 22 are placed further away to avoid bright spots during backlighting, while also reducing light loss through the total reflection tube 4, thus enabling two types of backlighting to be achieved under a single backlight source.
[0045] Optionally, the second circuit board 31 is provided with a tapered positioning hole 301; the total reflection cylinder 4 includes a cylindrical part 41 and a horn part 42 connected to the cylindrical part 41, the bottom of the cylindrical part 41 abuts against the first circuit board 21, and the hole wall of the tapered positioning hole 301 fits against the outer periphery of the horn part 42; the inner hole wall surface of the cylindrical part 41 and the inner hole wall surface of the horn part 42 are both total reflection surfaces.
[0046] Specifically, the conical positioning hole 301 makes the installation of the total reflection tube 4 easier and enables better precise positioning of the total reflection tube 4. It should also be noted that the bottom of the cylindrical part 41 abuts against and fits against the first circuit board 21, thereby guiding more infrared light to the diffuser plate 5.
[0047] Optionally, the horn-shaped inner hole wall of the horn-shaped tube portion 42 is formed; the center of the horn-shaped tube portion 42 and the center line of the cylindrical tube portion 41 coincide with each other. The horn-shaped inner hole wall can make infrared light more diffused and improve the backlight uniformity of infrared light.
[0048] In this embodiment, the first circuit board 21, the second circuit board 31, and the diffuser plate 5 are arranged at intervals along a vertically upward direction, and both the first circuit board 21 and the second circuit board 31 are parallel to the diffuser plate 5. Specifically, the distance between the first circuit board 21 and the second circuit board 31 can be set according to the specific brightness of the visible light lamp bead 32 and the infrared light lamp bead 22. The distance between the second circuit board 31 and the diffuser plate 5 needs to be specifically set according to the specific brightness of the visible light lamp bead 32 and the material of the diffuser plate 5.
[0049] Optionally, the housing 1 includes a base plate 51 and a side plate 52 fixedly connected to the base plate 51; the side plate 52 is provided with a limiting protrusion 521, and the limiting protrusion 521 and the base plate 51 are spaced apart to form a slot 522 for clamping the first circuit board 21.
[0050] The design of the card slot 522 can improve the installation efficiency of the first circuit board 21 and enable faster positioning of the first circuit board 21.
[0051] Optionally, the second circuit board 31 is mounted on the limiting protrusion 521. Specifically, the limiting protrusion 521 ensures the distance between the first circuit board 21 and the second circuit board 31.
[0052] Optionally, the bottom of the housing 1 is provided with several heat dissipation strips 53 to prevent the backlight from overheating and malfunctioning. Example 2
[0053] This embodiment provides a detection device, including a backlight source as described in any of the preceding embodiments.
[0054] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.
Claims
1. A backlight, comprising: The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source.
2. The backlight of claim 1, wherein, The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source.
3. The backlight of claim 2, wherein, The application relates to a backlight source. The application relates to a backlight source.
4. The backlight of claim 1, wherein, The application relates to a backlight source.
5. The backlight of claim 1, wherein, The application relates to a backlight source. The application relates to a backlight source.
6. The backlight of claim 5, wherein, The application relates to a backlight source.
7. The backlight of claim 1, wherein, The application relates to a backlight source.
8. A detection device, characterized in that The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. The application relates to a backlight source. 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