US3612835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined optical and magnetic transducer
Assignee: SandenVendo America Inc
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Filing: 1969-12-19
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Granted: 1971-10-12
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Expires: 1989-12-19
Abstract
Abstract A combined optical and magnetic transducer for sensing both optical and magnetic properties of an article, for example, a piece of paper currency or other document having both visible and magnetic markings to be tested or read, an information-bearing medium such as a data-recording tape to be read, or the like. The transducer comprises a magnetic-sensing head having a transparent gap separating the poles of the magnetic core of the head, a photoelectric element being disposed in the head in alignment with the gap. Outside the head, one side of the article contacts or is in close proximity to the poles at the gap, and the article is illuminated by a light source, so that both magnetic properties and optical properties of the article may be detected simultaneously during relative movement of the article and the transducer.
Inventors
- 👤 Boley A Andrews
- 👤 James F Ptacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:51
CPC Classifications
G; G11; G11B; G11B13/00; G11B13/04; G06; G06K; G06K7/00; G07; G07D; G07D7/00; G07D7/04; G07D7/06; G07D7/12; G07D7/121
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
Apparatus for sensing optical and magnetic properties of an article, said apparatus comprising: magnetic-sensing means provided with magnetic circuit structure having a substantially transparent gap therein adapted for disposition in proximal relationship to the article to sense magnetic properties thereof; and optical-sensing means disposed to sense optical properties of the article through said gap.
Claim 2
Dependent Claim
54 words
Apparatus for sensing optical and magnetic properties of an article, said apparatus comprising: magnetic-sensing means provided with magnetic circuit structure having a substantially transparent gap therein adapted for disposition in proximal relationship to the article to sense magnetic properties thereof; and optical-sensing means disposed to sense optical properties of the article through said gap.
Claim 3
Dependent Claim
26 words
The apparatus as claimed in claim 1, said optical-sensing means being disposed in the path of light rays entering said gap after incidence with the article.
Claim 4
Dependent Claim
53 words
The apparatus as claimed in claim 1, said magnetic-sensing means producing an output signal in response to the sensed magnetic properties, said gap defining a proximal region in which the presence of a magnetic substance causes the magnetic-sensing means to respond; and means for positioning a zone of the article in said region.
Claim 5
Dependent Claim
45 words
The apparatus as claimed in claim 3, said optical-sensing means producing an output signal in response to the sensed optical properties, and being disposed in the path of light rays entering said gap from said region after incidence with the article at said zone thereof.
Claim 6
Dependent Claim
52 words
The apparatus as claimed in claim 1, there being a light source for illuminating the article for transmission of light rays therefrom to said optical-sensing means through said gap, said structure being opaque and said gap being interposed in the path of the rays from said source to said optical sensing meanS.
Claim 7
Dependent Claim
36 words
The apparatus as claimed in claim 5, there being means for positioning a zone of the article between said source and said gap, whereby the optical-sensing means senses the transmittance of the article at said zone.
Claim 8
Dependent Claim
16 words
The apparatus as claimed in claim 1, said magnetic and optical sensing means being simultaneously operative.
Claim 9
Dependent Claim
59 words
The apparatus as claimed in claim 1, said structure comprising a magnetic core presenting said gap, the latter having inner and outer extremities, said magnetic-sensing means having a coil on said core for delivering an output signal indicative of the sensed magnetic properties, said optical-sensing means including a photosensitive element adjacent said inner extremity and aligned with said gap.
Claim 10
Dependent Claim
24 words
The apparatus as claimed in claim 8, there being means for positioning a zone of the article adjacent said outer extremity of the gap.
Claim 11
Dependent Claim
46 words
The apparatus as claimed in claim 1, each of said sensing means producing an output signal indicative of the properties sensed thereby; and detection means coupled with both of said sensing means and responsive to the output signals therefrom for reading the characteristics of the article.
Claim 12
Dependent Claim
101 words
Apparatus for sensing optical and magnetic properties of an article, said apparatus comprising: light transmittance sensing means including a pair of spaced, coacting elements; magnetic-sensing means provided with magnetic circuit structure having a gap therein disposed between said elements and defining a light-transmitting aperture; and means for positioning a zone of said article between said elements and proximal to said gap for sensing of magnetic properties of the article at said zone by said magnetic-sensing means, said elements comprising a light source for illuminating said zone and a photosensitive device responsive to light rays transmitted through the article at said zone.
Claim 13
Dependent Claim
101 words
Apparatus for sensing optical and magnetic properties of an article, said apparatus comprising: light transmittance sensing means including a pair of spaced, coacting elements; magnetic-sensing means provided with magnetic circuit structure having a gap therein disposed between said elements and defining a light-transmitting aperture; and means for positioning a zone of said article between said elements and proximal to said gap for sensing of magnetic properties of the article at said zone by said magnetic-sensing means, said elements comprising a light source for illuminating said zone and a photosensitive device responsive to light rays transmitted through the article at said zone.
References Cited (Backward Citations)
US2704634A
Cited
US3092402A
Cited
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 |