US3913094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Count sequence test set for a disc type digital encoder
Assignee: United States Department of the Navy
•
Filing: 1974-03-20
•
Granted: 1975-10-14
•
Expires: 1994-03-20
Abstract
Abstract A dynamic test set for encoders whose output code is two distinctly different gray codes. The two gray codes are converted to binary, then added together and fed to a storage register. The readout from the storage register is fed to an error detection circuit which approves an allowable difference in count of + OR - 1, + OR - 9, + OR - 11 and + OR - full count. Any other difference in count will cause an alarm to be energized thereby indicating an output error from the encoder.
Inventors
- 👤 Iii William F Wootton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:42
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/14; H03M7/16; G; G01; G01R; G01R31/00; G01R31/28; G01R31/317; G01R31/3181; G01R31/3185; G01R31/318522; G01R31/319; G01R31/3193; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
217 words
A device for checking a disc-type digital encoder which provides gray code outputs and cyclic gray code outputs corresponding to positions of a shaft of said encoder comprising, a first converter for converting a gray code to a first binary code, a second converter for converting a cyclic gray code to a second binary code, means for multiplying said first binary code by a factor of ten, adder means for adding said first binary code multiplied by a factor of ten and said second binary code, means connected to the output of said adder means for comparing an output against a previous output including an error detector connected to the output of said adder means for checking for a change in binary count of + OR - 1, + OR - 9, + OR - 11, and + OR - full count, and an alarm circuit connected to said error detector for providing a signal when said error detector detects a change other than + OR - 1, + OR - 9, + OR - 11 and + OR - full count, whereby any change other than + OR - 1, + OR - 9, + OR - 11 or + OR - full count indicates an output error in a disc type digital encoder being checked.
Claim 2
Independent Claim
217 words
A device for checking a disc-type digital encoder which provides gray code outputs and cyclic gray code outputs corresponding to positions of a shaft of said encoder comprising, a first converter for converting a gray code to a first binary code, a second converter for converting a cyclic gray code to a second binary code, means for multiplying said first binary code by a factor of ten, adder means for adding said first binary code multiplied by a factor of ten and said second binary code, means connected to the output of said adder means for comparing an output against a previous output including an error detector connected to the output of said adder means for checking for a change in binary count of + OR - 1, + OR - 9, + OR - 11, and + OR - full count, and an alarm circuit connected to said error detector for providing a signal when said error detector detects a change other than + OR - 1, + OR - 9, + OR - 11 and + OR - full count, whereby any change other than + OR - 1, + OR - 9, + OR - 11 or + OR - full count indicates an output error in a disc type digital encoder being checked.
Claim 3
Dependent Claim
43 words
A check-out system as set forth in claim 1 having a second error detector having as inputs the cyclic gray code bits from said encoder, said second error detector detecting for logic combinations which can exist only if the bits are shorted together.
Claim 4
Dependent Claim
21 words
A check-out system as set forth in claim 2 having said alarm circuit connected to an output of said error detector.
Claim 5
Dependent Claim
19 words
A check-out system as set forth in claim 3 wherein said alarm circuit is an audible tone warning device.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |