| United States Patent | 5,808,273 |
| Galster, et. al. | Sept. 15, 1998 |
Abstract
A process for adjusting a magneto-resistive sensor having a pair of current contacts and a pair of voltage contacts to compensate an offset error, without additional components. The magneto-resistive sensor (10) is charged with a homogeneous, definitely oriented magnetic field, a defined control current (I) is applied between its current contacts (22, 24) and at least one of the voltage contacts (30, 32) is trimmed, for example, by a laser beam (38), during the measurement of a pseudo-Hall voltage across the voltage contacts.
| Inventors: | Galster; Rudolf (Gerlingen, DE); Gerlach; Guenter (Rastatt, DE); Dukart; Anton (Woerth, DE); Marx; Klaus (Stuttgart, DE); Jost; Franz (Stuttgart, DE). |
| Assignee: | Robert Bosch GmbH (Stuttgart, DE). |
| Appl. No.: | 637,728 |
| Filed: | Apr. 26, 1996 |
| PCT Filed: | Oct. 7, 1994 |
| PCT No: | PCT/DE94/01172 |
| 371 Date: | Apr. 26, 1996 |
| 102(e) Date: | Apr. 26, 1996 |
| PCT Pub. No.: | WO95/12128 |
| PCT Pub. Date: | May 4, 1995 |
| Oct. 26, 1993 [DE] | 43 36 482.9 |
| Intl. Cl. : | B23K 26/00 |
| Current U.S. Cl.: | 219/121.69; 219/121.85; 29/610.1; 338/195; 338/32.H |
| Field of Search: | 219/121.68, 121.69, 121.83, 121.85; 324/207.2, 207.21, 251, 252; 29/602.1, 610.1, 593; 338/32 R, 32 H, 195 |
| 3,046,458 | Jul., 1962 | Basiago et al. | 338/32.H |
| 3,162,932 | Dec., 1964 | Wood et al. | 338/32.H |
| 3,789,311 | Jan., 1974 | Masuda | 338/32.H |
| 3,947,934 | Apr., 1976 | Olson | 29/602.1 |
| 4,259,563 | Mar., 1981 | Madeley | 219/121.69 |
| 4,698,522 | Oct., 1987 | Larsen et al. | 338/32.H |
| 4221385 | Aug., 1991 | DE | |
| 3-259578 | Nov., 1991 | JP | |
| 4-42978 | Feb., 1992 | JP | |
| 1290215 | Feb., 1987 | SU |
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