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| United States Patent | 5,829,125 |
| Fujimoto, et. al. | Nov. 3, 1998 |
Method of manufacturing circuit module
Abstract
The present invention relates to a method of manufacturing a circuit module through the use of a wireless bonding technique. In this invention, in order to achieve component assembly without experiencing thermal and mechanical stresses, in the circuit module manufacturing method in which an external electrode of a component and a conductor of a substrate are connected with each other according to the wireless bonding technique, the substrate has a laser beam transmissible property, and after the component is placed on an assembly surface of the substrate, a laser beam is applied from a surface of the substrate opposite to the assembly surface thereof to a connecting spot. The laser beam passing through the substrate heats the connecting spot so that the connection between the external electrode of the component and the conductor of the substrate is made by phase transition or diffusion.
| Inventors: | Fujimoto; Masayuki
(Tokyo, JP);
Nakazawa; Matsuo
(Tokyo, JP);
Takahashi; Hiroshi
(Tokyo, JP);
Suzuki; Kazutaka
(Tokyo, JP);
Isuzuku; Koichiro
(Tokyo, JP).
|
| Assignee: | Taiyo Yuden Co., Ltd.
(Tokyo, JP).
|
| Appl. No.: | 698,163 |
| Filed: | Aug. 7, 1996 |
Foreign Application Priority Data
| Aug. 8, 1995 [JP] | 7-202092 |
| Intl. Cl. : | H05K 3/34 |
| Current U.S. Cl.: | 29/840; 219/121.64 |
| Field of Search: | 29/840; 219/121.63, 121.64 |
References Cited | [Referenced By]
U.S. Patent Documents
| 4,535,219 | Aug., 1985 | Sliwa | 219/121.64 X |
| 5,049,718 | Sept., 1991 | Spletter et al. | 219/121.64 |
| 5,250,781 | Oct., 1993 | Kanda et al. | 29/840 X |
| 5,361,491 | Nov., 1994 | Oomachi et al. | 29/840 X |
| 5,405,809 | Apr., 1995 | Nakamura et al. | 29/840 X |
| 5,481,082 | Jan., 1996 | Yamamoto | 219/121.64 X |
| 5,495,089 | Feb., 1996 | Freedman et al. | 219/121.64 |
| 5,500,502 | Mar., 1996 | Horita et al. | 219/121.64 X |
| 5,545,281 | Aug., 1996 | Matsui et al. | 29/840 X |
| 5,644,837 | Jul., 1997 | Fathi et al. | 29/840 X |
Primary Examiner: Johnson; Linda
Attorney, Agent or Firm: Lowe Hauptman Gopstein Gilman & Berner
22 Claims, 47 Drawing Figures
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