US3759082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing stress-sensitive semiconductor transducer
Assignee: AG Communication Systems Corp
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Filing: 1972-01-20
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Granted: 1973-09-18
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Expires: 1992-01-20
Abstract
Abstract A motor driven force transducer applies stress at a selected rate to a substrate bearing a stress-sensitive test specimen. The analog electrical outputs of the specimen under test and the force transducer are converted to digital form for correlation by a computer.
Inventors
- 👤 J Provenzano
- 👤 D Hiestand
- 👤 J Krabec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:05
CPC Classifications
G; G01; G01L; G01L25/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
Apparatus for testing the stress-sensitivity of stresssensitive semiconductor transducers, which produce electrical output signals proportional to the level of stress applied thereto, said apparatus comprising a stress-sensitive semiconductor transducer to be tested, means for supporting said stress-sensitive transducer in a fixed position, a force transducer including a load cell, adapted to be driven at a selected rate with respect to said stress-sensitive transducer, and operative to produce an electrical output signal indicative of the level of force sensed thereby, a stressing member coupled to one end of said force transducer and being driven therewith, means for driving said force transducer and stressing member with respect to said stress-sensitive transducer to thereby apply stress thereto, first output means coupled to said force transducer, second output means contacting said stress-sensitive transducer for coupling electrical output signals therefrom, and means coupled to said first and second output means for correlating said force transducer output signals and said stress-sensitive transducer output signal.
Claim 2
Dependent Claim
158 words
Apparatus for testing the stress-sensitivity of stresssensitive semiconductor transducers, which produce electrical output signals proportional to the level of stress applied thereto, said apparatus comprising a stress-sensitive semiconductor transducer to be tested, means for supporting said stress-sensitive transducer in a fixed position, a force transducer including a load cell, adapted to be driven at a selected rate with respect to said stress-sensitive transducer, and operative to produce an electrical output signal indicative of the level of force sensed thereby, a stressing member coupled to one end of said force transducer and being driven therewith, means for driving said force transducer and stressing member with respect to said stress-sensitive transducer to thereby apply stress thereto, first output means coupled to said force transducer, second output means contacting said stress-sensitive transducer for coupling electrical output signals therefrom, and means coupled to said first and second output means for correlating said force transducer output signals and said stress-sensitive transducer output signal.
Claim 3
Dependent Claim
34 words
Apparatus as recited in claim 1 further including means coupled to said correlating means for displaying the output signal of said stress-sensitive transducer as a function of the output signal of said force transducer.
Claim 4
Dependent Claim
53 words
Apparatus as recited in claim 1 wherein said correlating means includes an analog-to-digital conversion circuit coupled to the outputs of said stress-sensitive transducer and said force transducer, and operative to convert the electrical output signals therefrom to binary form and digital data processing means for correlating the binary outputs of said conversion circuit.
Claim 5
Dependent Claim
94 words
Apparatus as recited in claim 1 wherein said driving means comprises a threaded actuator member disposed substantially parallel to the longitudianl axis of said force transducer, fixed in translation and adapted to be driven in rotation about its own longitudianl axis, means for mounting said force transducer, said mounting means fixed in rotation, adapted for longitudinal translation substantially parallel to said actuator member and including a threaded portion engaging said threads of said actuator member, and means for driving said actuator member in rotation whereby said force transducer mounting means is driven in translation.
Claim 6
Dependent Claim
19 words
Apparatus as recited in claim 4 wherein said actuator member driving means is a variable speed reversible electric motor.
Claim 7
Dependent Claim
43 words
Apparatus as recited in claim 5 further including first and second limit switches disposed in a preselected relationship with respect to said force transducer mounting means to sense translation thereof to preselected limits, coupled to said motor, and operative to reverse said motor.
Claim 8
Dependent Claim
28 words
Apparatus as recited in claim 5 further including a reduction gear assembly including a driving pinion gear engaging said motor, and a driven gear engaging said actuator member.
Claim 9
Dependent Claim
41 words
Apparatus as recited in claim 1 wherein said stress-sensitive transducer is a thin film transducer deposited on a transducer substrate, and said stressing member is driven into contact with said substrate thereby applying stress through said substrate to said stress-sensitive transducer.
Claim 10
Dependent Claim
39 words
Apparatus as recited in claim 8 wherein said transducer supporting means comprises means for supporting said substrate at the periphery thereof with said transducer disposed on the surface of said substrate opposite that in contact with said stressing member.
Claim 11
Dependent Claim
71 words
Apparatus as recited in claim 9 wherein said second output means comprises a printed wiring card disposed within said substrate supporting means and having an output electrical circuit disposed thereon, an electrical spring contact disposed on said printed wiring card in electrical continuity with said output circuit, and adapted to engage said stress-sensitive transducer and couple the output signal therefrom, and means for coupling said output circuit to said correlating means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |