Patent US5202230A successfully refreshed from Google Patents.
Patent US6202932B1 successfully refreshed from Google Patents.
US6202932B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
contactless coupling between a host unit and a smart card
Assignee: Individual
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Filing: 1999-10-01
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Granted: 2001-03-20
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Expires: 2019-10-01
Abstract
Abstract A method and module for transferring energy, clock frequency and data information without using an electrically conducting connection between a portable module and host equipment. Energy is transferred as optical radiation from at least two distinct light sources with intensities alternating between the minimum and maximum values in such a way that when one intensity goes from minimum to maximum the other goes from maximum to minimum wherein total intensity of optical radiation received by the module and supply voltage formed therefrom is nearly constant. The clock frequency is formed by and detected as the cyclical alteration of light intensities. Data is transferred as a modulation of the clock frequency.
Inventors
- 👤 Juha Rapeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:35
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/077; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/1097; G06K19/0723; G06K7/0008
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
153 words
A method of transferring energy, clock frequency and data from a host equipment to a smart card's semiconductor chip which is connected to the host equipment without an electrically conducting contact, comprising the steps of: transferring energy to the smart card as optical radiation from at least two distinct light sources; varying light intensity of each of the light sources periodically between maximum and minimum values in such a way that while a radiation intensity of one of the light sources goes from minimum to maximum, a radiation intensity of the other of the light sources changes accordingly from maximum to minimum so that total intensity of light emission remains essentially constant; transmitting the clock frequency via a cyclical alteration of energy transfer from the light sources wherein the alteration frequency of the radiation sources becomes the clock frequency for the smart card; and transferring data as a modulation of the clock frequency.
Claim 2
Independent Claim
153 words
A method of transferring energy, clock frequency and data from a host equipment to a smart card's semiconductor chip which is connected to the host equipment without an electrically conducting contact, comprising the steps of: transferring energy to the smart card as optical radiation from at least two distinct light sources; varying light intensity of each of the light sources periodically between maximum and minimum values in such a way that while a radiation intensity of one of the light sources goes from minimum to maximum, a radiation intensity of the other of the light sources changes accordingly from maximum to minimum so that total intensity of light emission remains essentially constant; transmitting the clock frequency via a cyclical alteration of energy transfer from the light sources wherein the alteration frequency of the radiation sources becomes the clock frequency for the smart card; and transferring data as a modulation of the clock frequency.
Claim 3
Dependent Claim
37 words
The method according to claim 1 , wherein the data information is demodulated using a pre-defined edge of one radiation intensity to trigger the state of the other radiation intensity to the logical state of the data.
Claim 4
Dependent Claim
39 words
The method according to claim 1 , wherein the data transfer from the smart card to the host equipment is performed from the surface of the integrated circuit chip in the smart card by using an electromagnetic proximity connection.
Claim 5
Dependent Claim
26 words
The method according to claim 1 , wherein the optical radiation from the distinct light sources are guided to separated areas on the smart card's surface.
Claim 6
Dependent Claim
43 words
The method according to claim 1 , wherein the optical radiation from the distinct radiation sources are guided to an essentially single area on the smart card's surface and distinguished therein from their different wavelengths and using distinct detectors to detect different wavelengths.
Claim 7
Dependent Claim
117 words
A smart card for storing and processing of information, comprising: a semiconductor chip in the card; at least one optically transparent area on a surface of the card for receiving radiation from two or more light sources and for guiding the radiation on to a defined area on the semiconductor chip; means for converting optical radiation guided to the defined area into electric energy, said means comprising, two photo-voltaic converters, the first of said converters converting alternating radiation intensity into an electrical signal, and the second of said converters converting received alternating radiation intensity into an electrical signal, the radiation intensities being arranged in such a way that the sum of said electrical signals is essentially constant.
Claim 8
Dependent Claim
117 words
A smart card for storing and processing of information, comprising: a semiconductor chip in the card; at least one optically transparent area on a surface of the card for receiving radiation from two or more light sources and for guiding the radiation on to a defined area on the semiconductor chip; means for converting optical radiation guided to the defined area into electric energy, said means comprising, two photo-voltaic converters, the first of said converters converting alternating radiation intensity into an electrical signal, and the second of said converters converting received alternating radiation intensity into an electrical signal, the radiation intensities being arranged in such a way that the sum of said electrical signals is essentially constant.
Claim 9
Dependent Claim
23 words
The smart card as in claim 6 , further comprising means for producing a continuous operating voltage from the received alternating radiation intensities.
Claim 10
Dependent Claim
48 words
The smart card as in claim 6 , wherein both photo-voltaic converters are connected to a triggering circuitry which converts the output of photo-voltaic converters into a two stage signal and that the output of the triggering circuitry is used as the clock signal of the smart card.
Claim 11
Dependent Claim
74 words
The smart card as in claim 8 , wherein the triggering circuitry additionally contains a flip-flop circuit where a data input is connected to the output of one of said photo-voltaic converters, and a clock input is connected to the output of the other of said photo-voltaic converters, and the output of which is a data signal representing a value of one radiation intensity as triggered by an edge of the other radiation intensity.
Claim 12
Dependent Claim
45 words
The smart card as in claim 6 , further comprising capacitive electrodes located on defined areas of the semiconductor chip, a potential of the capacitive electrodes being altered between two values according to data to be transferred from the smart card to a host unit.
Claim 13
Dependent Claim
53 words
The smart card as in claim 6 , further comprising a pn-junction on a surface of the semiconductor chip, said pn-junction being optically observable through the surface of the smart card, and an optical reflection coefficient of said pn-junction being altered by a voltage across the pn-junction according to data to be transferred.
Claim 14
Dependent Claim
63 words
The smart card as in claim 6 , further comprising an internal oscillator attached to a divider with a division number M, and another divider for dividing an externally applied clock frequency with a division number N for detecting via comparison whether the externally applied clock frequency is between a minimum and maximum values and thus acceptable for operation of the smart card.
Claim 15
Dependent Claim
59 words
The smart card as in claim 12 , further comprising means for storing energy which is required during one basic operation in such a way that when the energy supply from an external source becomes interrupted during the operation, the smart card performs a controlled interruption by using said stored energy and the internal oscillator as the clock frequency.
Claim 16
Dependent Claim
98 words
A reader for a smart card having space for adopting and supporting the smart card, the reader comprising two light sources optically isolated from each other when the smart card is supported by the reader, a light intensity of each of said two light sources varying periodically between maximum and minimum values in such a way that while the light intensity of one of said sources goes from minimum to maximum, the light intensity of the other of said sources changes accordingly from maximum to minimum so that a total intensity of the light sources remains essentially constant.
Claim 17
Dependent Claim
98 words
A reader for a smart card having space for adopting and supporting the smart card, the reader comprising two light sources optically isolated from each other when the smart card is supported by the reader, a light intensity of each of said two light sources varying periodically between maximum and minimum values in such a way that while the light intensity of one of said sources goes from minimum to maximum, the light intensity of the other of said sources changes accordingly from maximum to minimum so that a total intensity of the light sources remains essentially constant.
References Cited (Backward Citations)
US3971916A
Cited
EP0056064A1
Cited
DE3047322A1
Cited
US4742573A
Cited
US5196682A
Cited
US4783598A
Cited
US5122644A
Cited
EP0387383A1
Cited
GB2278085A
Cited
US5434401A
Cited
DE19500805A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-03-19 | 2004-09-18 | 2005-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-03-19 | 2008-09-18 | 2009-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-03-19 | 2012-09-18 | 2013-03-20 | $7700.00 | Window Closed / Lapsed |