CN-121994808-A - Visual inspection method for needle-shaped component

CN121994808ACN 121994808 ACN121994808 ACN 121994808ACN-121994808-A

Abstract

The visual inspection method of a needle member according to an embodiment of the present invention may include the steps of placing a needle member in an inclined posture on an upper surface of an inspection stage, correcting the needle member to an upright posture based on a magnet, rotating the needle member and photographing a surface of the needle member, and performing defect inspection of the needle member based on a plurality of photographed images obtained by photographing the surface of the needle member.

Inventors

Quan Heji
LIU ZHIMAN
CUI XIANGZHEN
JIN CHENGQI
Jia Renhao

Assignees

ENSCAPE有限公司

Dates

Publication Date: 20260508
Application Date: 20251105
Priority Date: 20241105

Claims (11)

1. A method for visual inspection of a needle-shaped member, comprising the steps of: placing the needle-shaped member in an inclined posture on the upper surface of the detection stage; correcting the needle-shaped member to an upright posture by a magnet; rotating the needle-shaped member and photographing the surface of the needle-shaped member, and The needle member is subjected to defect detection based on a plurality of photographed images obtained by photographing the surface of the needle member.
2. A visual inspection method of a needle-shaped member as set forth in claim 1, wherein, In the step of correcting the needle member to the upright posture, the magnet is moved relative to the needle member to correct the needle member to the upright posture.
3. A visual inspection method of a needle-shaped member as set forth in claim 2, wherein, In the step of correcting the needle member to an upright posture, a magnet driving unit for moving the magnet is controlled by a proportional-integral control method so as to move the magnet so that a center axis of the magnet is coaxial with a center axis of the needle member.
4. A visual inspection method of a needle-shaped member as set forth in claim 2, wherein, In the step of correcting the needle member to an upright posture, a distance M by which the magnet located on the lower side of the detection stage moves toward the needle member in the horizontal direction is calculated by a mathematical formula m=kx, Wherein K is a proportionality constant obtained through experiments, and X is the length of the needle-shaped part projected onto the upper surface of the detection table.
5. The visual inspection method of a needle-shaped member of claim 1, further comprising the steps of: Before photographing the surface of the needle member, the position of the detection table with respect to a rotation driving part that rotates the detection table is adjusted so that the lower end portion of the needle member is positioned on the rotation axis of the rotation driving part.
6. A visual inspection method of a needle-shaped member as set forth in claim 1, wherein, The step of performing the defect detection comprises the steps of: obtaining a plurality of modified images by changing the needle-shaped member displayed in each of the photographed images to a prescribed posture; extracting an extraction target area showing a part of the needle-shaped member from each of the modified images and connecting a plurality of the extraction target areas to each other to obtain a combined image, and And performing visual detection on the combined image.
7. A visual inspection method of a needle-shaped member as set forth in claim 6, wherein, In the step of photographing the surface of the needle member, the surface of the needle member is photographed in a state in which light from an illumination module is irradiated to the needle member.
8. The visual inspection method of a needle-shaped member as set forth in claim 7, wherein, In the step of obtaining the combined image, the extraction target area is identified based on a difference in pixel values of a surface and a background of the needle-shaped member in the modified image due to light of the illumination module.
9. A visual inspection method of a needle-shaped member as set forth in claim 6, wherein, The step of obtaining the modified image comprises the steps of: distinguishing a plurality of regions of interest of the needle member displayed in each of the captured images; Dividing each of the captured images so that a plurality of the regions of interest are displayed in different images, thereby obtaining a plurality of divided images, and And changing the region of interest displayed in each of the divided images to the prescribed pose, thereby obtaining a plurality of the modified images.
10. A visual inspection method of a needle-shaped member as set forth in claim 6, wherein, In the step of obtaining the combined image, a plurality of the extraction target areas are continuously connected in a manner conforming to the actual position in the needle member, thereby obtaining the combined image.
11. The visual inspection method of a needle-shaped member as set forth in claim 9, wherein, In the step of obtaining the modified image, the prescribed posture is a posture that is photographed when the needle member is accurately perpendicular to the inspection stage.

Description

Visual inspection method for needle-shaped component Technical Field The application relates to a visual inspection method of a needle-shaped component. The present application is a product of "large-scale technology industrialization project" (quality control by spring needle (Pogo Pin) appearance inspection equipment development and mass production inspection of a demanding enterprise, subject No. P0023213) in charge of korean industrial technology holonomy institute (KIAT). Background In the data economic transformation, with the development of technologies such as AI, IOT, big data, etc., the demand for semiconductors in various industrial fields such as automatic driving automobiles, robots, 5G, mobile home appliances, etc. is increasing. In semiconductor processing, pogo pins (Pogo pins) are required as core components for performance and reliability testing of semiconductors. Such a pogo pin is disclosed in korean patent No. 1204273. The minimum diameter of the spring needle is about 0.15mm, the minimum length is 1mm, various specifications are produced, so far, the appearance detection of the spring needle adopts microscopic visual detection, and the classification operation also adopts manual operation, so that the problem of low production efficiency exists. In order to solve the existing problems, a method of automatically performing the appearance detection of the pogo pin is required, and a unit for maintaining the pogo pin in an appropriate posture during the appearance detection of the pogo pin is necessarily required. Disclosure of Invention Technical problem The invention aims to solve the technical problem of providing a method capable of automatically detecting the appearance of a spring needle. In addition, the technical problem to be solved by the present invention is to provide a visual inspection method capable of improving accuracy and reliability for a side surface of a pogo pin having a curved shape. The technical problems of the present invention are not limited to the above-described technical problems, and a person skilled in the art can clearly understand a plurality of other technical problems not mentioned from the following description. Technical proposal The visual inspection method of a needle member according to an embodiment of the present invention for solving the above-described technical problems may include the steps of placing a needle member in an inclined posture on an upper surface of an inspection table, correcting the needle member to an upright posture by a magnet, rotating the needle member and photographing a surface of the needle member, and performing defect inspection of the needle member based on a plurality of photographed images obtained by photographing the surface of the needle member. In the step of correcting the needle member to the upright posture, the magnet may be moved relative to the needle member to correct the needle member to the upright posture. In the step of correcting the needle member to the upright posture, a magnet driving unit for moving the magnet may be controlled by proportional integral control (PI: proportional Integral control) so as to move the magnet so that a central axis of the magnet is coaxial with a central axis of the needle member. In the step of correcting the needle member to the upright posture, a distance M by which the magnet located at the lower side of the detection stage moves toward the needle member in the horizontal direction may be calculated by a mathematical formula m=kx, where K is a proportionality constant obtained through a test, and X is a length of the needle member projected onto the upper surface of the detection stage. In the step of photographing the surface of the needle member, the position of the inspection stage with respect to a rotation driving portion for rotating the inspection stage may be adjusted so that the rotation axis of the rotation driving portion is aligned with the central axis of the needle member. The step of performing the defect detection may include the steps of obtaining a plurality of modified images by changing the needle-shaped member displayed in each of the photographed images to a prescribed posture, extracting an extraction target area displaying a part of the needle-shaped member from each of the modified images, and connecting the plurality of extraction target areas to each other to obtain a combined image, and performing visual detection on the combined image. In the photographing of the surface of the needle member, the surface of the needle member may be photographed in a state in which light from an illumination module is irradiated to the needle member. In the step of obtaining the combined image, the extraction target region may be identified based on a difference in pixel values of a surface and a background of the needle-shaped member in the modified image due to light of the illumination module. The step of obtaining the modified image may include th