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CN-224215189-U - Oblique illumination device for detecting surface concave-convex of elliptical or cylindrical object

CN224215189UCN 224215189 UCN224215189 UCN 224215189UCN-224215189-U

Abstract

The utility model discloses an oblique lighting device for detecting the surface roughness of an elliptical or cylindrical object, which comprises a shell, wherein a plurality of light source monomer components are uniformly arranged on a bottom plate in the shell along the X axis, each light source monomer component comprises a planoconvex lens arranged along the Z axis, a lamp strip is arranged on the left side of each planoconvex lens, each lamp strip comprises a plurality of lamp beads arranged along the Y axis, a cover plate arranged obliquely is arranged above each lamp bead, one end of each cover plate is connected with the top end of each planoconvex lens, the other end of each cover plate is connected with the bottom plate in the shell, each cover plate comprises a light absorbing velvet layer, a diffuse reflection layer opposite to each lamp bead is arranged on the inner end surface of each light absorbing velvet layer, and a polarizing plate and a light condensing rod arranged along the X axis are sequentially arranged above each light source monomer component. The utility model has simple structure and convenient installation, can stably emit even and high-brightness oblique light, and is suitable for detecting the low-angle illumination of a dark field of the concave-convex surface of an elliptical or cylindrical object.

Inventors

  • LI GUOYING

Assignees

  • 北京博兴远志科技有限公司

Dates

Publication Date
20260508
Application Date
20250627

Claims (7)

  1. 1. A slant lighting device for detecting oval or cylindrical object surface unsmooth, a serial communication port, including casing (1), evenly be equipped with a plurality of light source monomer subassemblies (2) along the X axial on the bottom plate in casing (1), light source monomer subassembly (2) include one along planoconvex lens (21) of Z axial setting, the plane end of planoconvex lens (21) is equipped with dodging membrane (25), the left side of planoconvex lens (21) is equipped with a lamp area, the lamp area includes a plurality of lamp pearl (22) that set up along the Y axial, the apron that a slant set up has been arranged to the top of lamp pearl (22), the one end of apron with the top of planoconvex lens (21) is connected, and the other end with the bottom plate in casing (1) is connected, the apron includes light absorbing velvet layer (23), the inner terminal surface of light absorbing velvet layer (23) be equipped with lamp pearl (22) relative diffuse reflection layer (24), polarizer (3) and spotlight stick (4) that set up along the X axial have been arranged in proper order to the top of light source monomer subassembly (2).
  2. 2. A diagonal illumination device for detecting surface irregularities of an elliptical or cylindrical object according to claim 1, characterized in that the beads (22) are patch-type LED beads.
  3. 3. An oblique illumination device for detecting surface irregularities of an elliptical or cylindrical object according to claim 2, characterized in that the root of the plano-convex lens (21) is flush with the light emitting surface of the lamp bead (22).
  4. 4. A diagonal illumination device for detecting surface irregularities of an elliptical or cylindrical object according to claim 3, characterized in that the lamp beads (22) are placed at a distance of one focal length from the plano-convex lens (21).
  5. 5. The oblique illumination device for detecting the surface roughness of an elliptical or cylindrical object according to claim 1, wherein the aperture of the plano-convex lens (21) is 5-7 times the aperture of the light emitting surface of the lamp bead (22).
  6. 6. An oblique illumination device for detecting surface irregularities of an elliptical or cylindrical object according to claim 1, characterized in that the distance L > b/tan θ between adjacent plano-convex lenses (21), where b is the caliber of the plano-convex lens (21) and θ is the angle of the parallel light beam emitted from the plano-convex lens (21) with the principal optical axis of the plano-convex lens (21).
  7. 7. A diagonal illumination device for detecting surface irregularities of an elliptical or cylindrical object according to claim 1, characterized in that the distance of the lamp beads (22) from the diffuse reflecting layer (24) is not less than 5mm.

Description

Oblique illumination device for detecting surface concave-convex of elliptical or cylindrical object Technical Field The utility model relates to the technical field of illumination for optical detection, in particular to an oblique illumination device for detecting surface concave-convex of an elliptical or cylindrical object. Background Bright field light illumination is a common optical detection method, and is typically performed using a forward, linear light source. When detecting the surface of an object, light uniformly irradiates the surface of the object from all directions, and the light reflected by the object enters the detection system. Although the bright field irradiation method is simple and easy to use, the bright field irradiation method is easily influenced by the smoothness of the surface of an object and the reflection characteristics of the surface, and the fine defects of the surface cannot be well revealed. For example, like the pits and the convex hulls on the surface of an elliptical or cylindrical object, the reflection of these defects is weak, and may be masked under the irradiation of bright field light, resulting in low image contrast and inaccurate detection. Disclosure of utility model In view of the above-mentioned technical problems in the related art, the present utility model provides an oblique illumination device for detecting the surface roughness of an elliptical or cylindrical object, which can solve the above-mentioned problems. In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows: The utility model provides a slant lighting device for detecting oval or cylindrical object surface concave-convex, includes the casing, evenly be equipped with a plurality of light source monomer subassemblies along X axial on the bottom plate in the casing, light source monomer subassembly includes a planoconvex lens that sets up along Z axial, planoconvex lens's plane end is equipped with even light membrane, planoconvex lens's left side is equipped with a lamp area, the lamp area includes a plurality of lamp pearls that set up along Y axial, the apron that the slant set up has been arranged to the top of lamp pearl, the one end of apron with planoconvex lens's top is connected, the other end with the bottom plate in the casing is connected, the apron includes the light absorbing velvet layer, the inner terminal surface on light absorbing velvet layer be equipped with the diffuse reflection layer that the lamp pearl is relative, light source monomer subassembly's top has arranged polarizer and spotlight stick along X axial in proper order. Further, the lamp beads are patch type LED lamp beads. Further, the root of the plano-convex lens is flush with the light emitting surface of the lamp bead. Further, the lamp beads are placed at a position which is one time focal distance away from the plano-convex lens. Further, the caliber of the plano-convex lens is 5-7 times of the caliber of the light emitting surface of the lamp bead. Further, a distance L between adjacent plano-convex lenses is greater than b/tan theta, wherein b is the caliber of the plano-convex lens, and theta is an included angle between a parallel light beam emitted from the plano-convex lens and a main optical axis of the plano-convex lens. Further, the distance between the lamp beads and the diffuse reflection layer is not smaller than 5mm. The utility model has the beneficial effects of simple structure, convenient installation, stable emission of uniformly and highlight oblique light, and suitability for low-angle illumination of dark fields for detecting the surface roughness of elliptic or cylindrical objects. Drawings In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. The utility model is described in further detail below with reference to the accompanying drawings. FIG. 1 is a schematic view of an oblique illumination device for detecting surface irregularities of an elliptical or cylindrical object according to an embodiment of the present utility model; fig. 2 is an enlarged view of a portion of the left side of fig. 1. In the figure: 1. A housing; 2, a light source monomer component, 21, a plano-convex lens, 22, lamp beads, 23, a light absorption velvet layer, 24, a diffuse reflection layer, 25, a light homogenizing film, 3, a polarizing plate and 4, a light condensing rod. Detailed Description The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is appa