Combined backlight source device

Abstract

The utility model relates to the technical field of light sources, and discloses a combined backlight source device which comprises a bottom light source and a side light source, and the bottom light source and the side light source both irradiate a target detection position. The spectroscope is located at the light path coincidence position of the bottom light source and the side light source; wherein the bottom light source passes through a transmission light path of the spectroscope and is coaxial with a reflection light path of the side light source passing through the spectroscope; and the light of the transmission light path and the light of the reflection light path are finally converged into the imaging assembly. After the bottom light source emits light, the light passes through the spectroscopic lens to illuminate the workpiece, and the camera exposes and takes a picture, so that the outline of the fine needle body is detected; the side light source directly irradiates the workpiece, the workpiece enters the camera to be imaged after being reflected by the light splitting lens, and the detection accuracy of the fine needle type workpiece is remarkably improved through multi-angle detection of the profile of the fine needle.

Description

Technical Field

[0001] This utility model relates to the field of light source technology, and in particular to a combined backlight device. Background Technology

[0002] In industrial production, the inspection of fine needle-like workpieces is crucial for product quality control. Traditional inspection methods typically employ a single-angle light source. However, due to the slender structure and complex surface features of fine needles, a single light source cannot fully and clearly display their complete outline. This leads to problems such as missing outline information and blurred details during inspection, resulting in errors in the inspection results and failing to meet the requirements for high-precision inspection. Therefore, improvements to existing technologies are necessary.

[0003] 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

[0004] This invention provides a combined backlight device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A combined backlight device, comprising:

[0007] A bottom light source and a side light source, both of which illuminate a target detection position;

[0008] A beam splitter is located at the point where the optical paths of the bottom light source and the side light source overlap; wherein the transmitted optical path of the bottom light source through the beam splitter is coaxial with the reflected optical path of the side light source through the beam splitter.

[0009] The imaging component, in which the light rays from the transmitted light path and the reflected light path ultimately converge into the imaging component.

[0010] Optionally, the combined backlight device further includes a light source housing, the light source housing including a rear cover plate; the side light source is mounted on the inner side of the rear cover plate.

[0011] Optionally, the light source housing further includes a left side plate and a right side plate, and each of the left side plate and the right side plate is provided with a lens slot at a corresponding position, and one or both sides of the beam splitter are respectively fixed in a corresponding lens slot.

[0012] Optionally, the light source housing also includes a front cover plate, the front cover plate being provided with a foam slot, and the other side of the beam splitter being fixed in the foam slot; elastic foam is attached inside the foam slot, the elastic foam being used to compress and fix the beam splitter.

[0013] Optionally, the left side plate is provided with a workpiece slot for placing the workpiece to be inspected, and the position of the workpiece slot corresponds to the target inspection position.

[0014] Optionally, the size of the workpiece groove is adapted to the shape of a fine needle-like workpiece, and the edge of the workpiece groove is provided with a scratch-resistant chamfer.

[0015] Optionally, the transmitted light path of the bottom light source and the reflected light path of the side light source are coaxially superimposed to form a composite light path, which covers the target detection position.

[0016] Optionally, the imaging component includes an industrial camera and a lens, wherein the optical axis of the lens is coaxially aligned with the composite optical path.

[0017] Optionally, the beam splitter is a semi-transparent and semi-reflective mirror, and the ratio of the transmittance to the reflectance of the beam splitter is adapted to the light intensity ratio of the bottom light source and the side light source.

[0018] Optionally, the combined backlight device further includes a control module, which is used to synchronously adjust the brightness and exposure sequence of the bottom light source and the side light source.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model provides a combined backlight device. After the bottom light source emits light, the light passes through the beam splitter to illuminate the workpiece, and the camera exposes and captures the image, realizing the detection of the outline of the fine needle body. The side light source directly illuminates the workpiece, and after being reflected by the beam splitter, it enters the camera for imaging. By detecting the outline of the fine needle from multiple angles, the accuracy of the detection of fine needle workpieces is significantly improved.

[0021] 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

[0022] 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.

[0023] Figure 1 This is an exploded view of a combined backlight device provided by this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a combined backlight device provided by this utility model;

[0025] Figure 3 This is a schematic diagram of the optical path of a combined backlight device provided by this utility model.

[0026] Reference numerals: 10, Light source housing; 21, Bottom light source; 22, Side light source; 31, Beam splitter; 41, Rear cover plate; 42, Front cover plate; 421, Foam slot; 4211, Elastic foam; 431, Left side plate; 4311, Workpiece slot; 432, Right side plate; 4321, Lens slot; 51, Industrial camera; 52, Lens; 60, Workpiece. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Similar to the understanding 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.

[0034] 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.

[0035] 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.

[0036] Please refer to the reference. Figures 1 to 3 This utility model provides a combined backlight device, comprising:

[0037] Bottom light source 21 and side light source 22, both illuminate a target detection position;

[0038] Beam splitter 31 is located at the point where the optical paths of the bottom light source 21 and the side light source 22 overlap; wherein, the transmitted optical path of the bottom light source 21 through beam splitter 31 is coaxial with the reflected optical path of the side light source 22 through beam splitter 31.

[0039] The imaging component, the transmitted light path, and the reflected light path all ultimately converge into the imaging component.

[0040] By illuminating the target detection position from different directions using the bottom light source 21 and the side light source 22, and using the beam splitter 31 to coaxially superimpose the transmitted light path of the bottom light source 21 and the reflected light path of the side light source 22, the two light paths eventually converge into the imaging component. This allows the workpiece body contour and surface details to be captured simultaneously in a single imaging, avoiding the image misalignment problem caused by light path separation in traditional multi-light source detection, and significantly improving detection efficiency and accuracy.

[0041] Furthermore, the combined backlight device also includes a light source housing 10, which includes a rear cover plate 41; a side light source 22 is mounted on the inner side of the rear cover plate 41. By mounting the side light source 22 on the inner side of the rear cover plate 41 of the light source housing 10, it is beneficial to ensure the installation stability of the light source and facilitate the quick replacement and maintenance of the light source.

[0042] Furthermore, the light source housing 10 also includes a left side plate 431 and a right side plate 432. Lens slots 4321 are provided at corresponding positions on both the left and right side plates 431 and 432. Two sides of the beam splitter 31 are respectively fixed in their corresponding lens slots 4321. This symmetrical fixing method, where the two sides of the beam splitter 31 are embedded into their corresponding lens slots 4321, effectively prevents the beam splitter 31 from tilting or shifting in the optical path, ensuring the coaxiality of the optical path. It also simplifies the installation process of the beam splitter 31 and reduces the impact of assembly errors on image quality.

[0043] Furthermore, the light source housing 10 also includes a front cover plate 42, on which a foam slot 421 is provided. The other side of the beam splitter 31 is fixed in the foam slot 421. Elastic foam 4211 is attached inside the foam slot 421, and the elastic foam 4211 is used to compress and fix the beam splitter 31. By using the flexibility of the foam to apply uniform compressive force to the beam splitter 31, the risk of lens breakage that may be caused by rigid fixation is avoided, and the gapless fit between the beam splitter 31 and the slot is ensured. This eliminates the abnormal light scattering or refraction caused by lens loosening, and further improves the stability of the light path.

[0044] Furthermore, the left side plate 431 is provided with a workpiece slot 4311 for placing the workpiece 60 to be inspected, and the position of the workpiece slot 4311 corresponds to the target inspection position.

[0045] The workpiece slot 4311 on the left side plate 431 is precisely aligned with the target detection position, so that the workpiece 60 to be detected can be placed in the optimal imaging area above the beam splitter 31, avoiding positional deviations when placed manually. At the same time, the open design of the slot facilitates the quick loading and unloading of workpieces, which is especially suitable for batch detection scenarios and improves the overall detection efficiency.

[0046] Furthermore, the size of the workpiece groove 4311 is adapted to the shape of the fine needle-like workpiece, and the edge of the workpiece groove 4311 is provided with an anti-scratch chamfer, thereby effectively avoiding scratches or wear caused by the fine needle-like workpiece coming into contact with the sharp edge of the groove when it is placed or taken out.

[0047] Furthermore, the transmitted light path of the bottom light source 21 and the reflected light path of the side light source 22 are coaxially superimposed to form a composite light path. The composite light path covers the target detection position, eliminating the shadow area under the illumination of a single light source, so that the three-dimensional contour of the workpiece is fully presented in the two-dimensional image. It is especially suitable for high-precision dimensional measurement and defect detection of fine needle-like workpieces.

[0048] Furthermore, the imaging assembly includes an industrial camera 51 and a lens 52, with the optical axis of the lens 52 coaxially aligned with the composite optical path.

[0049] Furthermore, the beam splitter 31 is a semi-transparent and semi-reflective mirror. The ratio of the transmittance to the reflectance of the beam splitter 31 is adapted to the light intensity ratio of the bottom light source 21 and the side light source 22. This helps to avoid local overexposure or loss of detail in the image due to excessive light from a certain light source, thereby providing clear contour features for subsequent image analysis.

[0050] Furthermore, the combined backlight device also includes a control module, which is used to synchronously adjust the brightness and exposure sequence of the bottom light source 21 and the side light source 22. By synchronously adjusting the brightness and exposure sequence of the bottom light source 21 and the side light source 22, the lighting conditions can be dynamically optimized according to the material, reflective characteristics, or detection requirements of different workpieces, thereby improving the applicability and detection accuracy of the device.

[0051] 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 combined backlight device, characterized in that, include: A bottom light source (21) and a side light source (22) are provided, both of which illuminate a target detection position. Beam splitter (31) is located at the point where the light paths of the bottom light source (21) and the side light source (22) overlap; wherein, the transmission light path of the bottom light source (21) through the beam splitter (31) is coaxial with the reflection light path of the side light source (22) through the beam splitter (31). The imaging component, in which both the transmitted light path and the reflected light path ultimately converge.

2. The combined backlight device according to claim 1, characterized in that, It also includes a light source housing (10), which includes a rear cover plate (41); the side light source (22) is installed on the inside of the rear cover plate (41).

3. The combined backlight device according to claim 2, characterized in that, The light source housing (10) also includes a left side plate (431) and a right side plate (432). The left side plate (431) and the right side plate (432) are provided with lens slots (4321) at corresponding positions. The two sides of the beam splitter (31) are respectively fixed in the corresponding lens slots (4321).

4. The combined backlight device according to claim 3, characterized in that, The light source housing (10) also includes a front cover plate (42), on which a foam slot (421) is provided. The other side of the beam splitter (31) is fixed in the foam slot (421). An elastic foam (4211) is attached inside the foam slot (421), and the elastic foam (4211) is used to squeeze and fix the beam splitter (31).

5. The combined backlight device according to claim 3, characterized in that, The left side plate (431) is provided with a workpiece slot (4311) for placing the workpiece (60) to be inspected, and the position of the workpiece slot (4311) corresponds to the target detection position.

6. The combined backlight device according to claim 5, characterized in that, The size of the workpiece groove (4311) is adapted to the shape of the fine needle-like workpiece, and the edge of the workpiece groove (4311) is provided with an anti-scratch chamfer.

7. The combined backlight device according to claim 1, characterized in that, The transmission light path of the bottom light source (21) and the reflection light path of the side light source (22) are coaxially superimposed to form a composite light path, which covers the target detection position.

8. The combined backlight device according to claim 7, characterized in that, The imaging assembly includes an industrial camera (51) and a lens (52), the optical axis of which is coaxially aligned with the composite optical path.

9. The combined backlight device according to claim 1, characterized in that, The beam splitter (31) is a semi-transparent and semi-reflective mirror, and the ratio of the transmittance to the reflectance of the beam splitter (31) is adapted to the light intensity ratio of the bottom light source (21) and the side light source (22).

10. The combined backlight device according to claim 1, characterized in that, It also includes a control module, which is used to synchronously adjust the brightness and exposure timing of the bottom light source (21) and the side light source (22).

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