Load cell and temperature correction of the same

Details Load cell and temperature correction of the same Load cell and temperature correction of the same

1987-03-30

1988-05-31

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

73766, 338 3, G01G 314, G01B 716, G01L 122

Patent

active

047474564

ABSTRACT:
A load cell and a method of correcting the same are provided wherein a beam member on which an insulator film is formed is prevented from being trimmed by a laser beam upon laser trimming thereof. The load cell comprises a span resistor member and a zero point resistor member both formed separately of the beam member and including a span temperature correcting thin film resistor and a zero point balance temperature correcting thin film resistor, respectively, each of which has a temperature coefficient and is formed on a substrate. The resistor members are applied to the insulator film on the beam member and the thin film resistors are connected to a bridge circuit. The thin film resistors are trimmed with a laser beam to correct the span temperature correcting thin film resistor and the zero point balance temperature correcting thin film resistor for temperature. The substrates intercept a laser beam upon laser trimming of the thin film resistors.

REFERENCES:
patent: 4158396 (1979-06-01), Suzuki et al.
patent: 4299130 (1981-11-01), Koneval
patent: 4332174 (1982-06-01), Suzuki et al.
patent: 4343197 (1982-08-01), Suzuki et al.
patent: 4432247 (1984-02-01), Takeno et al.
patent: 4630491 (1986-12-01), Kitagawa et al.

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