US3851745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric braille recording and reproducing system
Assignee: Canon Semiconductor Equipment Inc
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Filing: 1973-10-16
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Granted: 1974-12-03
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Expires: 1993-10-16
Abstract
Abstract Disclosed is an electric braille recording and reproducing system for the blind which not only permits information to be recorded in the form of electric signals of different frequencies on a magnetic recording tape, but also permits the information thus recorded to be retrieved from the tape in the form of the six-point code, thereby drastically reducing the bulky amount of documents in braille which would otherwise be inevitable. The electric braille recording and reproducing system is also useful in the education of the blind.
Inventors
- 👤 S Okazaki
- 👤 K Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
G; G09; G09B; G09B21/00; G09B21/001; G09B21/003; B; B41; B41J; B41J3/00; B41J3/32
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
237 words
In a braille recording and reproducing system, signal generator means for producing ac signals of different frequencies, at least two mixer circuits connected to said signal generator means for mixing signals selectively supplied thereto from said signal generator means, a braille keyboard including a master key and two sets of point keys corresponding to the six points in a braille character, each of said sets of point keys consisting of three-point keys, one of said sets of point keys when selectively pushed supplies accordingly different ac signals from said signal generator means to one of said mixer circuits and the other of said sets of point keys supplies different ac signals from said signal generator means to the other of said mixer circuits, dual channel magnetic recording and reproducing means operatively connected to said mixer circuits for recording on a recording medium electric signals each consisting of a combination of different frequencies depending on which of said point keys were operated, and an oscillator control circuit to supply simultaneously said different ac signals preselected by said two sets of point keys to both of said mixer circuits after a given time delay sufficient to allow said recording and reproducing means to start and reach a constant speed, and said master key operatively coupled to said magnetic recording and reproducing means and to said oscillator control circuit to initiate operation thereof responsive to actuation of said master key.
Claim 2
Dependent Claim
237 words
In a braille recording and reproducing system, signal generator means for producing ac signals of different frequencies, at least two mixer circuits connected to said signal generator means for mixing signals selectively supplied thereto from said signal generator means, a braille keyboard including a master key and two sets of point keys corresponding to the six points in a braille character, each of said sets of point keys consisting of three-point keys, one of said sets of point keys when selectively pushed supplies accordingly different ac signals from said signal generator means to one of said mixer circuits and the other of said sets of point keys supplies different ac signals from said signal generator means to the other of said mixer circuits, dual channel magnetic recording and reproducing means operatively connected to said mixer circuits for recording on a recording medium electric signals each consisting of a combination of different frequencies depending on which of said point keys were operated, and an oscillator control circuit to supply simultaneously said different ac signals preselected by said two sets of point keys to both of said mixer circuits after a given time delay sufficient to allow said recording and reproducing means to start and reach a constant speed, and said master key operatively coupled to said magnetic recording and reproducing means and to said oscillator control circuit to initiate operation thereof responsive to actuation of said master key.
Claim 3
Dependent Claim
81 words
The system of claim 1 in which two frequeNcy discriminators are connected to said magnetic recording and reproducing means, two pulse generators connected to said discriminators and two sets of dc amplifiers connected to said pulse generators, each set of dc amplifiers consisting of three dc amplifiers, and in which a reading and embossing block having movable elements is connected to said dc amplifiers to produce the points of said braille character when energized by electric pulses from said dc amplifiers.
Claim 4
Dependent Claim
34 words
The system of claim 1 in which said signal generator means comprises a plurality of oscillator means in which the number of said oscillator means is less than the number of said point keys.
Claim 5
Dependent Claim
19 words
The system of claim 1 and further comprising amplifying means for amplifying the output signals from said mixer circuits.
Claim 6
Dependent Claim
20 words
The system of claim 2 in which said movable elements of said reading and embossing block comprise movable pin rods.
Claim 7
Dependent Claim
36 words
The system of claim 5 and further comprising electric coil means connected to said dc amplifiers and said pin rods and operable to move said pin rods when energized by electric pulses from said dc amplifiers.
Claim 8
Dependent Claim
188 words
In a braille recording and reproducing system, signal generator means for producing ac signals of different frequencies, at least two mixer circuits connected to said signal generator means for mixing signals selectively supplied thereto from said signal generator means, a braille keyboard including a master key and two sets of point keys corresponding to the six points in a braille character, each of said sets of point keys consisting of three-point keys, one of said sets of point keys when selectively pushed supplying accordingly different ac signals from said signal generator means to one of said mixer circuits and the other of said sets of point keys supplying different ac signals from said signal generator means to the other of said mixer circuits, said master key being operable to simultaneous supply said different ac signals preselected by said two sets of point keys to both of said mixer circuits, and dual channel magnetic recording and reproducing means operatively connected to said mixer circuits for recording on a recording medium electric signals each consisting of a combination of different frequencies depending on which of said point keys were operated.
Claim 9
Dependent Claim
188 words
In a braille recording and reproducing system, signal generator means for producing ac signals of different frequencies, at least two mixer circuits connected to said signal generator means for mixing signals selectively supplied thereto from said signal generator means, a braille keyboard including a master key and two sets of point keys corresponding to the six points in a braille character, each of said sets of point keys consisting of three-point keys, one of said sets of point keys when selectively pushed supplying accordingly different ac signals from said signal generator means to one of said mixer circuits and the other of said sets of point keys supplying different ac signals from said signal generator means to the other of said mixer circuits, said master key being operable to simultaneous supply said different ac signals preselected by said two sets of point keys to both of said mixer circuits, and dual channel magnetic recording and reproducing means operatively connected to said mixer circuits for recording on a recording medium electric signals each consisting of a combination of different frequencies depending on which of said point keys were operated.
Claim 10
Dependent Claim
81 words
The system of claim 7 in which two frequency discriminators are connected to said magnetic recording and reproducing means, two pulse generators connected to said discriminators and two sets of dc amplifiers connected to said pulse generators, each set of dc amplifiers consisting of three dc amplifiers, and in which a reading and embossing block having movable elements is connected to said dc amplifiers to produce the points of said braille character when energized by electric pulses from said dc amplifiers.
Claim 11
Dependent Claim
34 words
The system of claim 7 in which said signal generator means comprises a plurality of oscillator means in which the number of said oscillator means is less than the number of said point keys.
Claim 12
Dependent Claim
19 words
The system of claim 7 and further comprising amplifying means for amplifying the output signals from said mixer circuits.
Claim 13
Dependent Claim
20 words
The system of claim 8 in which said movable elements of said reading and embossing block comprise movable pin rods.
Claim 14
Dependent Claim
36 words
The system of claim 11 and further comprising electric coil means connected to said dc amplifiers and said pin rods and operable to move said pin rods when energized by electric pulses from said dc amplifiers.
Claim 15
Dependent Claim
169 words
In a braille recording and reproducing system, a braille keyboard including two sets of point keys corresponding to the six points in a braille character, each of said sets of point keys consisting of three-point keys, signal generator means for producing a number of frequencies less than the number of said point keys, at least two mixer circuits connected to said signal generator means for mixing signals selectively supplied thereto from said signal generator means such that when one of said sets of point keys is selectively pushed it supplies accordingly different ac signals from said signal generator means to one of said mixer circuits and the other of said sets of point keys supplies different ac signals from said signal generator means to the other of said mixer circuits and dual channel magnetic recording and reproducing means operatively connected to said mixer circuits for recording on a recording medium electric signals each consisting of a combination of different frequencies depending on which of said point keys were operated.
Claim 16
Dependent Claim
169 words
In a braille recording and reproducing system, a braille keyboard including two sets of point keys corresponding to the six points in a braille character, each of said sets of point keys consisting of three-point keys, signal generator means for producing a number of frequencies less than the number of said point keys, at least two mixer circuits connected to said signal generator means for mixing signals selectively supplied thereto from said signal generator means such that when one of said sets of point keys is selectively pushed it supplies accordingly different ac signals from said signal generator means to one of said mixer circuits and the other of said sets of point keys supplies different ac signals from said signal generator means to the other of said mixer circuits and dual channel magnetic recording and reproducing means operatively connected to said mixer circuits for recording on a recording medium electric signals each consisting of a combination of different frequencies depending on which of said point keys were operated.
Claim 17
Dependent Claim
81 words
The system of claim 13 in which two frequency discriminators are connected to said magnetic recording and reproducing means, two pulse generators connected to said discriminators and two sets of dc amplifiers connected to said pulse generators, each set of dc amplifiers consisting of three dc amplifiers, and in which a reading and embossing block having movable elements is connected to said dc amplifiers to produce the points of said braille character when energized by electric pulses from said dc amplifiers.
Claim 18
Dependent Claim
34 words
The system of claim 13 in which said signal generator means comprises a plurality of oscillator means in which the number of said oscillator means is less than the number of said point keys.
Claim 19
Dependent Claim
19 words
The system of claim 13 and further comprising amplifying means for amplifying the output signals from said mixer circuits.
Claim 20
Dependent Claim
20 words
The system of claim 14 in which said movable elements of said reading and embossing block comprise movable pin rods.
Claim 21
Dependent Claim
36 words
The system of claim 17 and further comprising electric coil means connected to said dc amplifiers and said pin rods and operable to move said pin rods when energized by electric pulses from said dc amplifiers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |