[특허]Laser trimming of resistors

Laser trimming of resistors 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B23K-026/38 B23K-026/00
출원번호	US-0094003 (2005-03-29)
등록번호	US-7329831 (2008-02-12)
발명자 / 주소	Biunno,Nicholas Patel,Atul Ogle,Ken Dudnikov,George
출원인 / 주소	HADCO Santa Clara, Inc.
대리인 / 주소	Wilson Sonsini Goodrich & Rosati
인용정보	피인용 횟수 : 0 인용 특허 : 66

초록 ▼

Improved systems and methods for laser trimming resistors printed on a substrate layer are provided. An exemplary embodiment measures a resistance value for each annular resistor and sorts the annular resistors into one or more bins based on the measured resistance values and target resistance values associated with each resistor. A laser trim file may then be assigned to each bin based on a predictive trim formulation, where each laser trim file defines a set of configuration parameters for a laser drill to conform each resistor with their respective target value. The laser drill uses the laser trim files to trim the resistors within each bin in accordance with the laser trim file assigned to that bin.

대표청구항 ▼

What is claimed is: 1. A system for laser trimming annular resistors printed on a circuit board, the system comprising: a tester having means for measuring a resistance value for each annular resistor; a trim application having: means for sorting the annular resistors into one or more bins based on the measured resistance values and target resistance values associated with each annular resistor; and means for assigning a laser trim file to each bin based on a predictive trim formulation to conform each annular resistor with their respective target value; and a laser drill having means for trimming the annular resistors within each bin in accordance with the laser trim file assigned to that bin, each laser trim file defining a set of configuration parameters for the laser drill. 2. The system of claim 1, wherein the configuration parameters defined by the laser trim file include at least a spot size and power level for the laser drill. 3. The system of claim 1, wherein the laser trim file further defines a drill pattern on the annular resistor to form a planar channel within the annular resistor. 4. The system of claim 3, wherein the laser drill file includes at least a step size, an overlap factor and number of revolutions around the annular resistor to form the planar channel. 5. The system of claim 1, wherein the tester further includes means for measuring a resistance value of each trimmed annular resistor associated with a particular bin. 6. The system of claim 5, wherein the laser trim application further includes means for adjusting the laser trim file associated with the particular bin based on a distribution of the measured resistance values of the trimmed annular resistors within the particular bin. 7. The system of claim 5, wherein the laser trim application further includes means for displaying a distribution of the trimmed resistance values to assess performance of the laser drill file associated with the particular bin. 8. The system of claim 1, wherein the laser trim application further includes means for displaying a distribution of the measured resistance values associated with each bin to assess performance of an underlying screen printing process. 9. A method for laser trimming resistors, the method comprising: a step of measuring a resistance value for each resistor of a set of resistors on a circuit substrate layer; a step of sorting the resistors into one or more bins based on the measured resistance values and target resistance values associated with each resistor; a step of assigning a laser trim file to each bin based on a predictive trim formulation, each laser trim file defining a set of configuration parameters for a laser drill to conform each resistor with their respective target value; and a step of using the laser drill to trim the resistors within each bin in accordance with the laser trim file assigned to that bin; wherein the laser trim file further defines a drill pattern on the resistor to form a planar channel within the resistor. 10. The method of claim 9, wherein the configuration parameters defined by the laser trim file include at least a spot size and power level for the laser drill. 11. The method of claim 9, wherein the resistors comprise annular resistors. 12. The method of claim 11, wherein the laser trim file includes at least a step size, an overlap factor and number of feed steps over the resistor to form the planar channel. 13. A computer program product comprising: a computer usable medium having computer readable program code embodied therein, the computer readable program code comprising: means for receiving a resistance value for each resistor of a set of resistors on a circuit substrate layer; means for sorting the resistors into one or more bins based on the measured resistance values and target resistance values associated with each resistor; means for assigning a laser trim file to each bin based on a predictive trim formulation, each laser trim file defining a set of configuration parameters for a laser drill to conform each resistor with their respective target value; and means for outputting, for uploading to the laser drill, a file having assignment of the respective resistors to respective laser trim files. 14. The computer program product of claim 13, further comprising means for displaying a distribution of the measured resistance values associated with each bin to assess performance of an underlying passive component formation process.

이 특허에 인용된 특허 (66)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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Laser trimming of resistors 원문보기

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Laser trimming of resistors 원문보기

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