Invention Grant
- Patent Title: Method of separating chips from a wafer
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Application No.: US14785554Application Date: 2014-04-24
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Publication No.: US09978643B2Publication Date: 2018-05-22
- Inventor: Frank Kriebel , Laurence Singleton , Carsten Nieland
- Applicant: Smartrac Technology GmbH
- Agent Tue Nguyen
- Priority: DE102013207480 20130424
- International Application: PCT/EP2014/058316 WO 20140424
- International Announcement: WO2014/173999 WO 20141030
- Main IPC: H01L21/78
- IPC: H01L21/78 ; B23K26/53 ; B23K26/00 ; B23K26/40 ; H01L29/34 ; B23K101/40 ; B23K103/16 ; B23K103/00

Abstract:
The invention relates to a method for producing chips (13) by dividing a wafer along dividing lines (11, 12) defining dimensions of the chip, wherein a focus (18) of a preferably pulsed laser radiation (16) is moved along the dividing lines on a first and at least a second path (25, 26) within the wafer body, wherein the laser radiation is applied to the wafer from a rear side (17) of the wafer, and the power density for producing the defects (28) on the first path (25) is lower than the power density for producing the defects (29) on the second path (26), and/or the number of defects on the first path is smaller than the number of defects on the second path.
Public/Granted literature
- US20160093534A1 Method for Separating Chips from a Wafer Public/Granted day:2016-03-31
Information query
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