Die bond touch down detector
First Claim
1. A die bond touch down detector circuit, comprising:
- a plurality of strain gauges operable to detect deformations of a die bond head;
an amplifier operable to amplify an output signal from said plurality of strain gauges;
a filter operable to eliminate noise from said output signal; and
a microprocessor operable to process said output signal in order to generate a touch down signal indicating that said die bond head has come in contact with an obstacle, wherein said microprocessor performs calibration of positioning equipment that positions said die bond head.
1 Assignment
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Accused Products
Abstract
A die bond touch down detector (20) includes a strain gauge circuit (22) having a plurality of strain gauges (12) formed into a wheatstone bridge configuration. The strain gauges (12) are mounted on a die bond head (10) and measure and detect deformations of the die bond head (10). The strain gauge circuit (22) generates a differential output signal in response to deformations detected by the strain gauges (12). The differential output signal is amplified, filtered, and converted to digital format for processing by a microcontroller (36). The microcontroller (36) performs calibration, display formatting, and touch down signal generation. The die bond touch down detector (20) provides real time monitorization, automatic calibration, and real force applied information for the die bond head (10).
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Citations
12 Claims
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1. A die bond touch down detector circuit, comprising:
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a plurality of strain gauges operable to detect deformations of a die bond head; an amplifier operable to amplify an output signal from said plurality of strain gauges; a filter operable to eliminate noise from said output signal; and a microprocessor operable to process said output signal in order to generate a touch down signal indicating that said die bond head has come in contact with an obstacle, wherein said microprocessor performs calibration of positioning equipment that positions said die bond head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. The method of detecting deformations in a die bond head, comprising the steps of:
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measuring deformations in a plurality of strain gauges in contact with the die bond head; processing measured deformations in the plurality of strain gauges to determine deformations of the die bond head; and determining a touch down position of the die bond head in response to the measured deformations. - View Dependent Claims (11, 12)
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Specification