Patent US3689162A successfully refreshed from Google Patents.
US3689162A
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US
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Apparatus for the relative positioning of two objects by means of a beam of radiation
Assignee: Individual
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Filing: 1971-01-25
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Granted: 1972-09-05
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Expires: 1991-01-25
Abstract
Abstract A displacement sensing device using superimposed dissimilar circular moire patterns. Groups of circles in one of the patterns alternately have a greater and a smaller pitch than those of the other pattern.
Inventors
- 👤 Eric Tapley Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:51
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38; B; B63; B63H; B63H25/00; B63H25/46; H; H01; H01J; H01J29/00; H01J29/46; H01J29/80; H01J29/81
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
An apparatus for determining the relative lateral positioning of two objects using circular moire patterns comprising a pattern of concentric circles on each of the objects, the concentric circles on one of the objects being equidistantly spaced and the concentric circles on the other object forming at least one group of equidistantly spaced circles, the pitch of the pattern on one object being different from the pitch of the pattern on the other object, the pattern on one object nearly engaging the pattern on the other object, and indexing means comprising a predetermined optical non-uniformity in at least one of the patterns, whereby the relative positions of the two objects can be determined when said patterns intercept a beam of radiation.
Claim 2
Independent Claim
121 words
An apparatus for determining the relative lateral positioning of two objects using circular moire patterns comprising a pattern of concentric circles on each of the objects, the concentric circles on one of the objects being equidistantly spaced and the concentric circles on the other object forming at least one group of equidistantly spaced circles, the pitch of the pattern on one object being different from the pitch of the pattern on the other object, the pattern on one object nearly engaging the pattern on the other object, and indexing means comprising a predetermined optical non-uniformity in at least one of the patterns, whereby the relative positions of the two objects can be determined when said patterns intercept a beam of radiation.
Claim 3
Dependent Claim
26 words
An apparatus as claimed in claim 1, wherein the spacing between the adjacent circles in each pattern is one-half of the pitch of the respective pattern.
Claim 4
Dependent Claim
27 words
An apparatus as claimed in claim 1, wherein the optical non-uniformity comprises in one of the patterns a light transmitting in place of a light absorbing circle.
Claim 5
Dependent Claim
33 words
An apparatus as claimed in claim 1, wherein the optical non-uniformity comprises groups of alternate circles in one pattern having a greater and smaller pitch respectively, then the pitch of the other pattern.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |