Patent US3838211A successfully refreshed from Google Patents.
US3838211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching system and devices
Assignee: Individual
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Filing: 1973-01-04
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Granted: 1974-09-24
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Expires: 1993-01-04
Abstract
Abstract In teaching certain subjects, it is necessary to communicate with the students using drawings as well as voice. Well known devices such as film, video tape and television have been used to automate the teaching process. Such devices, however, are expensive and difficult to use, especially by the teacher. This invention provides a system and devices used to implement the system, which enable automation of the teaching process, and which are relatively inexpensive and easy to use by both the teacher and student. Specifically, the invention pertains to an automated teaching system where a lecture consisting of voice and drawings or sketches and figures can be recorded on magnetic tape by means of an x-y record-reproduce device. The lecture, once recorded, may be duplicated many times and distributed among many students who can reproduce the recorded lecture on similar devices. The graphic information is reproduced on standard ordinary sheets of paper which the students may keep for later reference.
Inventors
- 👤 C Joannou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
297 words
A device for recording and reproducing information comprising: a. a plate of dielectric material on which writing paper may be affixed; b. a record stylus for writing graphic information, said stylus being energized by a signal generator so as to produce an electric field in the vicinity of its writing end; c. a moveable electrode assembly located underneath said dielectric plate, said electrode assembly being arranged to sense said electric field produced by said record stylus; d. a servo system operable in a record mode or a playback mode and arranged to move said electrode assembly in response to said electric field induced in said electrode assembly by said record stylus when in said record mode of operation and thus causing said electrode assembly to follow movements of said record stylus while writing on said paper; e. transducers connected to said servo system via linkages and arranged to produce electrical signals corresponding to positions of said electrode assembly; f. a reproduce stylus connected to said servo system via linkages and arranged to write on said paper in response to signals received by said servo system when operating in said playback mode; g. means for processing said signals produced by said transducers into a form suitable for storage on magnetic tape and means for processing signals from said magnetic tape into suitable form for driving said servo system; h. a tape recorder for recording and reproducing said signals corresponding to movements of said record stylus; i. means for sensing the lifting of said record stylus off said paper in the process of writing by sensing the iNtensity of said electric field induced in said electrode assembly and means for producing a signal corresponding to the lifting of said record stylus which is suitable for recording on magnetic tape.
Claim 2
Independent Claim
297 words
A device for recording and reproducing information comprising: a. a plate of dielectric material on which writing paper may be affixed; b. a record stylus for writing graphic information, said stylus being energized by a signal generator so as to produce an electric field in the vicinity of its writing end; c. a moveable electrode assembly located underneath said dielectric plate, said electrode assembly being arranged to sense said electric field produced by said record stylus; d. a servo system operable in a record mode or a playback mode and arranged to move said electrode assembly in response to said electric field induced in said electrode assembly by said record stylus when in said record mode of operation and thus causing said electrode assembly to follow movements of said record stylus while writing on said paper; e. transducers connected to said servo system via linkages and arranged to produce electrical signals corresponding to positions of said electrode assembly; f. a reproduce stylus connected to said servo system via linkages and arranged to write on said paper in response to signals received by said servo system when operating in said playback mode; g. means for processing said signals produced by said transducers into a form suitable for storage on magnetic tape and means for processing signals from said magnetic tape into suitable form for driving said servo system; h. a tape recorder for recording and reproducing said signals corresponding to movements of said record stylus; i. means for sensing the lifting of said record stylus off said paper in the process of writing by sensing the iNtensity of said electric field induced in said electrode assembly and means for producing a signal corresponding to the lifting of said record stylus which is suitable for recording on magnetic tape.
Claim 3
Dependent Claim
28 words
A device according to claim 1 in which said electrode assembly consists of a number of electrical conductors insulated from each other and supported by an insulated member.
Claim 4
Dependent Claim
42 words
A device according to claim 1 in which said plate of dielectric material is translucent and in which said electrode assembly is provided with a light source, said light source being arranged to transmit light through said dielectric plate and said paper.
Claim 5
Dependent Claim
42 words
A device according to claim 1 in which amplifying elements having high input impedance and low output impedance are used, said elements being mounted on said moveable electrode assembly and said elements being arranged to amplify signals induced in said electrode assembly.
Claim 6
Dependent Claim
23 words
A device according to claim 1 in which said transducers which produce signals corresponding to the movement of the record stylus are potentiometers.
Claim 7
Dependent Claim
42 words
A device according to claim 1 in which said means for processing said signals produced by said transducers consist of electronic circuitry which produces trains of pulses such that the time interval between said pulses corresponds to positions of said electrode assembly.
Claim 8
Dependent Claim
38 words
A device according to claim 1 in which said means for processing said signals produced by said transducers consist of electronic circuitry which produces AC voltages the frequency of which corresponds to the position of said electrode assembly.
Claim 9
Dependent Claim
38 words
A device according to claim 1 in which said reproduce stylus is mechanically connected to said servo system by a flexible ribbon capable of transmitting tensional as well as compressional forces, said flexible ribbon being guided by rollers.
Claim 10
Dependent Claim
32 words
A device according to claim 1 in which said tape recorder does not form part of said device and in which connectors are provided for driving said device from an external source.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |