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CN-224201564-U - Uniform lighting device for industrial microscopic detection

CN224201564UCN 224201564 UCN224201564 UCN 224201564UCN-224201564-U

Abstract

The utility model discloses a uniform lighting device for industrial microscopic detection, which comprises three LED light sources, wherein the size of a light emitting surface of the three LED light sources is 1.14mm multiplied by 1.14mm, a light distribution lens consists of a circular cylinder and a polygonal cylinder, three rectangular pyramid-shaped pits are formed in the bottom of the polygonal cylinder, the bottoms of the pits are square, three aspheric pits are formed in the top surface of the circular cylinder, the sections of the aspheric pits are round, and the LED light sources are fixed on the bottoms of the rectangular pyramid-shaped pits. The lens is designed into a quarter-ring cylinder, compared with the traditional rectangular lens, the size of the lens is reduced, the lens is adaptive to the industrial microscopic detection system packaging space with the diameter less than or equal to 50mm, the lens is formed by the cooperation of the bottom rectangular pyramid concave and the top aspheric surface concave, the characteristics of large field angle and high uniformity are generated on a target surface, the optical performance is improved, the mounting offset error is reduced through the positioning column and the heat dissipation groove, and the assembly stability is high.

Inventors

  • SUN XIANG
  • LIN WEN
  • YU TAO
  • LUO ZHENJUN
  • XU WENJIE
  • ZHANG DONGBO
  • PENG YUANYUAN
  • CHEN YUANKANG

Assignees

  • 华东交通大学

Dates

Publication Date
20260505
Application Date
20250626

Claims (10)

  1. 1. A uniform lighting device for industrial microscopic detection, comprising: Three LED light sources, the size of the light emitting surface is 1.14mm multiplied by 1.14mm; the light distribution lens consists of a circular cylinder and a polygonal cylinder; Three rectangular pyramid-shaped depressions are arranged at the bottom of the polygonal column body, and the bottoms of the depressions are square; the top surface of the circular cylinder is provided with three aspheric depressions, and the section of each aspheric depression is round; the LED light source is fixed to the bottom surface of the rectangular pyramid-shaped recess.
  2. 2. The uniform illumination device for industrial microscopic detection according to claim 1, wherein the light distribution lens is of a quarter-cylinder integrated structure and is made of PMMA.
  3. 3. A uniform illumination device for industrial microscopic detection according to claim 1, wherein the line connecting the central points of the three aspheric depressions forms an equilateral triangle with an circumscribed circle diameter of 18+ -0.2 mm.
  4. 4. A uniform illumination device for industrial microscopic examination according to claim 1, wherein the side slope of the rectangular pyramid-shaped concave portion has an angle of 65 DEG + -2 DEG with the bottom surface.
  5. 5. The apparatus of claim 1, wherein the height of the circular cylinder is 5+ -0.2 mm, the outer diameter is Φ25+ -0.5 mm, and the inner diameter is Φ10+ -0.3 mm.
  6. 6. A uniform illumination device for industrial microscopic detection according to claim 1, wherein the maximum depth of the aspheric concave is 1.8+ -0.1 mm, and the surface roughness Ra is less than or equal to 0.05 μm.
  7. 7. A uniform illumination device for industrial microscopic detection according to claim 1, wherein a chamfer structure with a width of 0.5+/-0.1 mm is arranged at the joint surface of the polygonal cylinder and the circular cylinder.
  8. 8. A uniform illumination device for industrial microscopic detection according to claim 1, wherein the distance between the edge of the light emitting surface of the LED light source and the bottom edge of the rectangular pyramid recess is 0.15+ -0.02 mm.
  9. 9. A uniform lighting device for industrial microscopic detection according to claim 1, wherein the top surface of the circular cylinder is provided with three positioning columns, the diameter phi is 1.2 plus or minus 0.1mm, and the height is 0.8 plus or minus 0.05mm.
  10. 10. The uniform illumination device for industrial microscopic detection according to claim 1, wherein the side wall of the light distribution lens is provided with radiating grooves with the depth of 0.2+/-0.05 mm, and the groove spacing is 2+/-0.2 mm.

Description

Uniform lighting device for industrial microscopic detection Technical Field The utility model belongs to the technical field of non-imaging optical design, and particularly relates to a uniform lighting device for industrial microscopic detection. Background In the field of industrial microscopic detection, the diameter of an illumination cavity space of an embedded detection platform (such as an automatic optical detection device (AOI)) is generally less than or equal to 50mm. In the current mainstream scheme, the light guide plate scheme needs a plurality of layers of optical films, the thickness is larger than or equal to 8mm, the illumination uniformity of the distance of 200mm is only 41.5%, the length of the lens array scheme is larger than 30mm and cannot be embedded into miniaturized equipment, and the bare lamp direct irradiation scheme has small volume, but the light spot uniformity is smaller than 26%, and the detection requirement of a chip welding spot (the uniformity is required to be larger than 50%) cannot be met. The prior art fails to achieve illumination with >50% illuminance uniformity in a diameter <50mm space. The conventional lambertian body light source design method is not suitable for non-lambertian body LEDs with luminous surfaces of >1mm 2. It is to this particular contradiction that the present utility model proposes an innovative structural solution. Disclosure of utility model The utility model aims to provide a uniform lighting device for industrial microscopic detection, which is used for solving the technical problems that a microscopic detection system requires uniform illumination and very limited size for the lighting device. In order to solve the technical problems, the specific technical scheme of the utility model is as follows: in some embodiments of the application, there is provided a uniform illumination device for industrial microscopic detection, comprising: Three LED light sources, the size of the light emitting surface is 1.14mm multiplied by 1.14mm; the light distribution lens consists of a circular cylinder and a polygonal cylinder; Three rectangular pyramid-shaped depressions are arranged at the bottom of the polygonal column body, and the bottoms of the depressions are square; the top surface of the circular cylinder is provided with three aspheric depressions, and the section of each aspheric depression is round; the LED light source is fixed to the bottom surface of the rectangular pyramid-shaped recess. In some embodiments of the present application, the light distribution lens is a quarter-cylinder integrated structure, and is made of PMMA. In some embodiments of the present application, the line connecting the center points of the three aspheric depressions forms a regular triangle with an circumscribed circle diameter of 18±0.2 mm. In some embodiments of the application, the side slope of the rectangular pyramid-shaped depressions is at an angle of 65 deg. + -2 deg. to the base. In some embodiments of the application, the height of the circular cylinder is 5+ -0.2 mm, the outer diameter is Φ25+ -0.5 mm, and the inner diameter is Φ10+ -0.3 mm. In some embodiments of the application, the maximum depth of the aspherical concave is 1.8+ -0.1 mm, and the surface roughness Ra is less than or equal to 0.05 μm. In some embodiments of the present application, a chamfer structure with a width of 0.5 + -0.1 mm is provided at the junction of the polygonal cylinder and the circular cylinder. In some embodiments of the application, the light emitting surface edge of the LED light source is 0.15+ -0.02 mm from the base of the rectangular pyramid recess. In some embodiments of the application, three positioning columns are arranged on the top surface of the circular cylinder, the diameter phi is 1.2 plus or minus 0.1mm, and the height is 0.8 plus or minus 0.05mm. In some embodiments of the application, the side wall of the light distribution lens is distributed with heat dissipation grooves with the depth of 0.2+/-0.05 mm, and the groove spacing is 2+/-0.2 mm. Compared with the prior art, the utility model has the beneficial effects that, The lens is designed into a quarter-ring cylinder, compared with the traditional rectangular lens, the size of the lens is reduced, the lens is adaptive to the industrial microscopic detection system packaging space with the diameter less than or equal to 50mm, the lens is formed by the cooperation of the bottom rectangular pyramid concave and the top aspheric surface concave, the characteristics of large field angle and high uniformity are generated on a target surface, the optical performance is improved, the mounting offset error is reduced through the positioning column and the heat dissipation groove, and the assembly stability is high. Drawings Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The draw