US4767918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reading and writing apparatus for portable recording medium
Assignee: Toshiba Corp
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Filing: 1987-02-12
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Granted: 1988-08-30
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Expires: 2007-02-12
Abstract
Abstract In an IC card information reading and writing apparatus, a clock oscillator (4.9 MHz) is incorporated in the apparatus. Since the high-frequency clock is not passed through a cable connected between the apparatus and an external control unit, but supplied from the clock oscillator to the IC card via a short distance, the external control unit can stably control the IC card through the long cable without generating crosstalk or reflection. The clock signal is selectively supplied to the IC card via an AND gate in response to a clock-enable signal from the external control unit or a binary logic signal supply voltage for the reading and writing apparatus.
Inventors
- 👤 Hidekiyo Kushima
- 👤 Tsutomu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:27
CPC Classifications
G; G11; G11C; G11C7/00; G06; G06K; G06K7/00; G06K7/0013; G06K7/0086; G06K19/00; G06K19/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A reading and writing apparatus for a portable recording medium, having a recording medium loading section and a contact section to connect external terminals of the loaded recording medium to an external control unit for controlling the recording medium, which comprises: (a) clock oscillator means for generating an operation clock to be supplied to the portable recording medium through the contact section; and (b) logic circuit means responsive to a binary logic signal supplied from the external control unit, for selectively supplying the operation clock from said clock oscillator means to the recording medium.
Claim 2
Dependent Claim
94 words
A reading and writing apparatus for a portable recording medium, having a recording medium loading section and a contact section to connect external terminals of the loaded recording medium to an external control unit for controlling the recording medium, which comprises: (a) clock oscillator means for generating an operation clock to be supplied to the portable recording medium through the contact section; and (b) logic circuit means responsive to a binary logic signal supplied from the external control unit, for selectively supplying the operation clock from said clock oscillator means to the recording medium.
Claim 3
Dependent Claim
30 words
The reading and writing apparatus as set forth in claim 1, wherein said clock oscillator means is activated in response to a supply voltage for the reading and writing apparatus.
Claim 4
Dependent Claim
32 words
The reading and writing apparatus as set forth in claim 1, whrein said clock oscillator means is activated in response to a binary logic signal supply voltage for the portable recording medium.
Claim 5
Dependent Claim
42 words
The reading and writing apparatus as set forth in claim 1, wherein said logic circuit means is an AND gate having a first input terminal connected to said clock oscillator means and a second input terminal connected to the external control unit.
Claim 6
Dependent Claim
34 words
The reading and writing apparatus as set forth in claim 4, wherein the second input terminal of said AND gate is responsive to a clock-enable binary logic signal supplied from the external control unit.
Claim 7
Dependent Claim
34 words
The reading and writing apparatus as set forth in claim 4, wherein the second input terminal of said AND gate is responsive to a binary logic signal supply voltage for the portable recording medium.
Claim 8
Dependent Claim
49 words
The reading and writing apparatus as set forth in claim 6, wherein the second input terminal of said AND gate is responsive to a binary logic signal voltage outputted from a monitor circuit when the binary logic signal supply voltage for the portable recording medium exceeds a predetermined level.
Claim 9
Dependent Claim
20 words
The reading and writing apparatus as set forth in claim 1, wherein said portable recording medium is an IC card.
Claim 10
Dependent Claim
84 words
A reading and writing apparatus for a portable recording medium, having a recording medium loading section and a contact section to connect external terminals of the loaded recording medium to an external control unit for controlling the recording medium, which comprises: (a) clock oscillator means for generating an operation clock to be supplied to the portable recording medium through the contact section; and (b) said clock oscillator means being activated in response to a binary logic signal supply voltage for the portable recording medium.
Claim 11
Dependent Claim
84 words
A reading and writing apparatus for a portable recording medium, having a recording medium loading section and a contact section to connect external terminals of the loaded recording medium to an external control unit for controlling the recording medium, which comprises: (a) clock oscillator means for generating an operation clock to be supplied to the portable recording medium through the contact section; and (b) said clock oscillator means being activated in response to a binary logic signal supply voltage for the portable recording medium.
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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |