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CN-121993759-A - Lens structure, light source and detection equipment

CN121993759ACN 121993759 ACN121993759 ACN 121993759ACN-121993759-A

Abstract

The invention discloses a lens structure, a light source and detection equipment, which particularly comprise a positive lens part and a side lens part which are integrally formed, wherein the positive lens part is arranged between the two side lens parts, the positive lens part is used for enabling a positive light bead to be incident into a positive main beam and to be orthographic projected on a detection station, the side lens part is used for enabling a side light bead to be incident into a side main beam and to be oblique projected on the detection station, a reflecting surface is formed on the end part, far away from the positive lens part, of the side lens part, and the reflecting surface is used for enabling a side sub beam of an opposite side light bead to pass through the opposite side lens part and then be reflected on the detection station. In the structure, the front light lamp beads and the side light lamp beads can respectively emit light to the corresponding lens parts in a compact space, so that the transverse size and the longitudinal height of the whole lamp are obviously reduced. Meanwhile, the reflecting surface is formed on the side lens part, so that the overall efficiency of side light illumination is improved, the power of the lamp beads is not required to be additionally increased, and the power consumption is further reduced. The present invention can reduce the arrangement volume of the light source and reduce power consumption.

Inventors

  • CHEN LIN
  • WANG HUA
  • LI XIAOQING

Assignees

  • 深圳市美耐斯光电有限公司

Dates

Publication Date
20260508
Application Date
20260403

Claims (11)

  1. 1. The lens structure is characterized by comprising a positive lens part (100) and a side lens part (200) which are integrally formed, wherein the positive lens part (100) is arranged between the two side lens parts (200), the positive lens part (100) is used for enabling a positive light lamp bead (300) to enter a positive main light beam (301) and be orthographically emitted on a detection station, and the side lens part (200) is used for enabling a side light lamp bead (400) to enter a side main light beam (401) and be orthographically emitted on the detection station; The end of the side lens part (200) far away from the positive lens part (100) is provided with a side reflecting surface (240), and the side reflecting surface (240) is used for allowing side sub-beams (402) of the opposite side light beads (400) to pass through the opposite side lens part (200) and then reflect on a detection station.
  2. 2. The lens structure according to claim 1, wherein the side lens portion (200) includes a side main incident surface (210) and a side main exit surface (220), the side main incident surface (210) and the side main exit surface (220) are each disposed obliquely with respect to the normal main incident surface (110) of the positive lens portion (100), and the side main incident surface (210) and the side main exit surface (220) are each disposed obliquely in a direction approaching the detection station.
  3. 3. A lens arrangement according to claim 2, characterized in that the distance of the side main exit surface (220) from the side main entrance surface (210) in the direction of the side axis of the side light bead (400) increases in a direction closer to the positive axis of the positive light bead (300), such that the side main exit surface (220) is arranged obliquely with respect to the side main entrance surface (210).
  4. 4. A lens structure according to claim 3, wherein the side lens portion (200) comprises a first side transmission portion (201) and a second side transmission portion (202) integrally formed on the first side transmission portion (201), a side of the first side transmission portion (201) away from the second side transmission portion (202) being a side main incident surface (210), a side of the second side transmission portion (202) away from the first side transmission portion (201) being a side main exit surface (220); wherein the second side transmission part (202) does not completely cover the first side transmission part (201), and the thickness of the second side transmission part (202) increases gradually along the direction approaching to the positive optical axis of the positive light lamp bead (300).
  5. 5. The lens structure according to claim 4, wherein the side lens portion (200) further comprises a third side transparent portion (203), the third side transparent portion (203) is formed above the first side transparent portion (201) and the second side transparent portion (202), and a surface of the third side transparent portion (203) contacting the second side transparent portion (202) is a side reflection surface (240).
  6. 6. A lens structure according to claim 5, wherein a side of the third side transmitting portion (203) which is in contact with the side reflecting surface (240) and is at least partially opposite to the side main incident surface (210) is a side sub-exit surface (230), and the side sub-exit surface (230) is configured to scatter the side sub-beam (402) incident on the side light bead (400) outwards.
  7. 7. A lens structure according to claim 1, characterized in that the normal incidence surface (110) of the positive lens portion (100) comprises a first incidence surface (111) arranged opposite to the normal incidence light bead (300) and a second incidence surface (112) arranged outside the first incidence surface (111), the second incidence surface (112) being arranged in parallel with respect to the first incidence surface (111) or further away from the normal incidence light bead (300) with respect to the first incidence surface (111).
  8. 8. The lens structure according to claim 7, wherein the positive emission surface (120) of the positive lens portion (100) includes a first emission surface (121) provided corresponding to the first incident surface (111) and a second emission surface (122) provided corresponding to the second incident surface (112), and the second emission surface (122) is provided in parallel with the first emission surface (121) or closer to the positive lamp bead (300) than the first emission surface (121).
  9. 9. The lens structure according to claim 8, wherein the positive lens portion (100) further comprises a positive reflection surface (130) connected with the positive main incidence surface (110), the positive main incidence surface (110) is connected with the positive reflection surface (130) to form a groove (101), the groove (101) is used for arranging a positive light lamp bead (300), a reflecting layer is arranged at a notch of the groove (101), the reflecting layer is provided with a dodging port corresponding to the positive light lamp bead (300), and positive and negative light beams (302) of the positive light lamp bead (300) are reflected by the positive reflection surface (130) and the reflecting layer and then are reflected into the positive main incidence surface (110).
  10. 10. A light source, characterized by comprising a front light bead (300), a side light bead (400) and a lens structure according to any of claims 1-9, wherein the front light bead (300) is arranged corresponding to the positive lens portion (100), and the side light bead (400) is arranged corresponding to the side lens portion (200).
  11. 11. A detection apparatus comprising the light source of claim 10 and a camera, both disposed toward the detection station.

Description

Lens structure, light source and detection equipment Technical Field The present invention relates to the field of detecting light source structures, and in particular, to a lens structure, a light source, and a detecting device. Background In modern industry, machine vision detection is widely applied to various scenes such as metal workpiece surface defect detection, electronic device detection, plastic shell burr detection, glass cover plate scratch detection and the like. In the above scenario, whether a camera can obtain a clear and stable image depends on whether the light source can provide suitable illumination conditions for different forms of workpieces. The actual workpiece often has multi-level structural characteristics, such as micro-convex points, wire drawing marks and knife lines of a metal workpiece, electronic devices with steps, grooves and welding disc height differences, and plastic parts with chamfer angles, parting lines and reflecting surfaces. Therefore, in a specific inspection scenario, the light source not only needs to provide enough brightness, but also must make edges, concave-convex features and fine defects fully appear in the image according to the geometry and material characteristics of the workpiece, while maintaining the overall uniformity of the imaging. Specifically, in the detection of scratches on metal surfaces, oblique light with strong directivity is required to generate obvious shadows and highlights, so that scratches are easier to identify in images, but the light causes uneven brightness in a large area, so that a camera is difficult to obtain stable exposure, and in the detection of step heights of electronic devices, lateral light condensation can protrude out of step edges, but the bottom of a step often becomes a dark area due to insufficient illumination, so that boundary positioning is affected. It can be seen that when the stereoscopic features such as concave-convex, steps, defects and the like are required to be highlighted, lateral light condensation or low-angle illumination is required to be relied on, and the illumination mode inevitably brings strong shadow to ensure that the overall illumination is uneven, whereas when a uniform light source is adopted to improve the consistency of the brightness of the image, defects, edges and concave-convex structures are no longer clear and even cannot be recognized by an algorithm due to lack of light directivity. In order to overcome the above technical problems, in the prior art, a mode of stacking a plurality of light sources is generally adopted, for example, as shown in fig. 1, lateral stripe light is combined on the basis of forward stripe light, and a composite light field is jointly constructed by the plurality of light sources. However, the scheme not only occupies large space, but also has inconsistent optical axes and non-uniform installation angles among the light sources, and is easy to generate mutual interference or shielding, so that the light field is unstable. More importantly, as the lateral strip light and the forward strip light occupy a certain space, under the condition of guaranteeing the inclination angle of the lateral strip light, the lateral strip light needs to be pulled away from the top normal incidence strip so as to ensure that the lateral strip light and the top normal incidence strip do not interfere with each other, on one hand, the light source occupies more space, and on the other hand, the pulled away lateral dimming is higher in required power consumption under the requirement of maintaining the same light field. Therefore, the existing light source combination scheme has the defects of large occupied volume and high power consumption, and influences the production of the light source scheme. Disclosure of Invention The invention aims to provide a lens structure, a light source and detection equipment, which solve the technical problems of large occupied volume, high power consumption and unfavorable production when the detection light source in the prior art is applied to a multi-layer workpiece. To achieve the purpose, the invention adopts the following technical scheme: The lens structure comprises a positive lens part and a side lens part which are integrally formed, wherein the positive lens part is arranged between the two side lens parts, and is used for enabling a positive light lamp bead to be incident on a positive main beam and to be orthographically shot on a detection station; The end part of the side lens part far away from the positive lens part is provided with a side reflecting surface, and the side reflecting surface is used for enabling side sub-beams of the opposite side light beads to pass through the opposite side lens part and then reflect on the detection station. Optionally, the side lens portion includes a side main incident surface and a side main exit surface, the side main incident surface and the side main exit surface are both inclined