US3612834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal readout method and apparatus
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1969-09-15
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Granted: 1971-10-12
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Expires: 1989-09-15
Abstract
Abstract A code carrier is in the form of a circular plate comprising concentric metal rings alternating radially with nonmetallic rings. All the rings have substantially the same radial width and preferably substantially the same axial thickness. In accordance with the particular code, certain of the rings are of magnetic metal and certain of the rings are of nonmagnetic metal. The code carrier is passed along a detection path, such as being slid along an aluminum channel. A pair of detectors are positioned along the detection path in alignment with the locus of movement of the center of the code carrier, and are spaced apart longitudinally of the path a distance equal to the radial width of the rings. One of these detectors detects magnetic metal and the other detector detects nonmagnetic metal. The outputs of the two detectors are connected through respective shaping circuits to the two inputs of an AND circuit which provides an output pulse responsive to simultaneous detection of both a magnetic ring and a nonmagnetic metal ring. The nonmagentic metal detector has an output branched therefrom, beyond the respective shaping circuit, and this output provides clock or timing pulses.
Inventors
- 👤 Masakazu Arikawa
- 👤 Yasuhiko Nohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:01
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/28; H03M1/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A signal readout method comprising the steps of providing a code carrier in the form of a plate having substantially identical opposite surfaces composed of metal strips alternating with nonmetallic strips, all of the metal strips being located identically on both surfaces and having substantially the same lateral spacing from each other, with some of the metal strips being magnetic and others being nonmagnetic, and the metal strips constituting code indicia; passing the code carrier along a detection path; separately and contactlessly scanning the magnetic and nonmagnetic strips on only one such surface at two respective points on the path centered on the locus of movement of the center of the code carrier and spaced apart by the spacing of the metal strips; and, responsive to simultaneous detection of a magnetic strip and a nonmagnetic strip, providing an output pulse corresponding to the detected code indicia.
Claim 2
Dependent Claim
146 words
A signal readout method comprising the steps of providing a code carrier in the form of a plate having substantially identical opposite surfaces composed of metal strips alternating with nonmetallic strips, all of the metal strips being located identically on both surfaces and having substantially the same lateral spacing from each other, with some of the metal strips being magnetic and others being nonmagnetic, and the metal strips constituting code indicia; passing the code carrier along a detection path; separately and contactlessly scanning the magnetic and nonmagnetic strips on only one such surface at two respective points on the path centered on the locus of movement of the center of the code carrier and spaced apart by the spacing of the metal strips; and, responsive to simultaneous detection of a magnetic strip and a nonmagnetic strip, providing an output pulse corresponding to the detected code indicia.
Claim 3
Dependent Claim
81 words
A signal readout method, as claimed in claim 1, in which the code carrier is provided in the form of a circular plate composed of concentric metal rings alternating radially with nonmetallic rings, with all of the metal rings having substantially the same radial spacing; scanning of the magnetic and nonmagnetic rings being effected at two points centered on the locus of movement of the center of the code carrier and spaced apart by the radial spacing of the metal rings.
Claim 4
Dependent Claim
25 words
A signal readout method, as claimed in claim 2, including the step of, responsive to detection of each nonmagnetic ring, providing an output clock pulse.
Claim 5
Dependent Claim
162 words
A signal readout apparatus comprising, in combination, a code carrier in the form of a plate having substantially identical opposite surfaces comprising metal strips alternating transversely with nonmetallic strips, all of the metal strips being located identically on both surfaces and having substantially the same lateral spacing with some of the metal strips being magnetic and the others being nonmagnetic, and the metal strips constituting code indicia; means providing a detection path along which the code carrier is passed; a first detector operable to detect magnetic metal contactlessly; a second detector operable to detect a nonmagnetic metal contactlessly; said first and second detectors being spaced from each other along said path by the lateral spacing of said strips and being centered on the locus of movement of the center of the code carrier; both detectors being positioned adjacent the same surface of a code carrier on said path; and an AND circuit having its inputs connected to the outputs of both detectors.
Claim 6
Dependent Claim
162 words
A signal readout apparatus comprising, in combination, a code carrier in the form of a plate having substantially identical opposite surfaces comprising metal strips alternating transversely with nonmetallic strips, all of the metal strips being located identically on both surfaces and having substantially the same lateral spacing with some of the metal strips being magnetic and the others being nonmagnetic, and the metal strips constituting code indicia; means providing a detection path along which the code carrier is passed; a first detector operable to detect magnetic metal contactlessly; a second detector operable to detect a nonmagnetic metal contactlessly; said first and second detectors being spaced from each other along said path by the lateral spacing of said strips and being centered on the locus of movement of the center of the code carrier; both detectors being positioned adjacent the same surface of a code carrier on said path; and an AND circuit having its inputs connected to the outputs of both detectors.
Claim 7
Dependent Claim
64 words
Signal readout apparatus, as claimed in claim 7, in which said code carrier is in the form of a circular plate comprising concentric metal rings alternating radially with nonmetallic rings and with all of the metal rings having substantially the same radial spacing from each other; said first and second detectors being spaced from each other by the radial spacing of said metal rings.
Claim 8
Dependent Claim
16 words
A signal readout apparatus, as claimed in claim 5, in which said detectors are proximity switches.
Claim 9
Dependent Claim
18 words
A signal readout apparatus, as claimed in claim 5, in which said detectors are eddy current pickup windings.
Claim 10
Dependent Claim
30 words
A signal readout apparatus, s claimed in claim 5, including a branch circuit extending from said second detector and providing clOck pulses responsive to detection of a nonmagnetic metal ring.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |