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Method of calibrating marking in laser marking system

A laser marking and coordinate system technology, applied in laser welding equipment, electrical components, circuits, etc., can solve problems such as deterioration of marking quality

Inactive Publication Date: 2007-12-26
TECHNICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the misaligned, in-carrier chips in each cell are marked by the method described above, the quality of the marking deteriorates significantly

Method used

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  • Method of calibrating marking in laser marking system
  • Method of calibrating marking in laser marking system
  • Method of calibrating marking in laser marking system

Examples

Experimental program
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Embodiment Construction

[0043] FIG. 5 is a view showing the structure of a laser marking system employing a marking calibration method according to a preferred embodiment of the present invention. In the drawings, for the same elements as in the conventional invention, the same names are used, and their detailed descriptions are omitted.

[0044] The laser marking system 160 includes: a carriage supply box 120, containing a plurality of carriages 110; a loader 130, which takes out a carriage 110 from the carriage supply box 120, and aligns the taken out carriages 110 on the horizontal transfer table 22; The stepper motor 150, transports the carriage 110 on the horizontal transfer table 122 in one direction; the laser marker 160, marks characters on each chip in the unit of the carriage 110 being conveyed below it; the rear vision camera 170, photographing the mark on the marked bracket 110 ; and an unloader 180 , unloading the marked bracket 110 into the bracket collection box 190 . In addition, the...

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PUM

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Abstract

In a method for calibrating marking in a laser marking system, (a) each chip is assigned to be observed to a corresponding vision camera, (b) a coordinate of the vision camera and a coordinate of the laser marker are matched, (c) a predetermined first symbol is marked on a chip or at a position corresponding to the chip, a selected first symbol is observed using the corresponding vision camera, and one point of the first symbol is taught as a reference point, (d) the first symbol and the reference point of the chip are observed using the corresponding vision camera and a second symbol is marked on the chip with respect to the reference point, (e) the second symbol on a selected chip is observed and one point of the second symbol is taught as a comparison point, and (f) a position of the comparison point is detected from the reference point on the chip and the marking error in each cell is calculated.

Description

technical field [0001] The present invention relates to a method of calibrating markings in a laser marking system using a vision camera, and more particularly, to a method of calibrating markings in a laser marking system, taking into account previously stored marking errors when photographing marked objects. Background technique [0002] FIG. 1 is a plan view showing a typical lead frame strip. Referring to the drawings, a plurality of chips 12 are mounted on a strip 10, and characters and / or numbers are marked on the surface of each chip 12 to distinguish the chips 12 according to production lots. A laser marker using a laser beam, which will be described later, is used as a marking device. Identification labels 14 are used to align the strips 10 . [0003] The marking process on the strip 10 with a laser marker is an automated process that includes handling the strip 10 to improve marking efficiency. [0004] FIG. 2 is a view showing a typical laser marking system. R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L23/544B23K26/00H01L21/00H01L21/68
CPCH01L2221/68313H01L21/67282H01L23/544H01L2223/54473H01L21/681H01L2924/0002H01L2924/00
Inventor 金炳焕李晸求边英植权九彻金泰政
Owner TECHNICS