US3717856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual heads with selective data dependent energization
Assignee: Toshiba Corp
•
Filing: 1971-12-30
•
Granted: 1973-02-20
•
Expires: 1991-12-30
Abstract
Abstract Magnetic tape memory apparatus consisting of a writing unit and a reading unit, the writing unit comprising a magnetic tape feeding device, a first and a second writing magnetic heads which are juxtaposed along the travelling direction of the magnetic tape in such a manner that the directions of magnetization thereof intersect substantially orthogonally to each other, and a logical circuit which effects change-over such that data are fed to the first magnetic head when each bit level of a plurality of bits constituting an address at each predetermined bit is ''''1'''' and that they are fed to the sevond magnetic head when it is ''''0,'''' the reading unit comprising the first and second reading magnetic heads which individually read information stored on the magnetic tape by the first and second writing magnetic heads, means to combine outputs from the first and second reading magnetic heads and to thereby reproduce the data, and means to compare an output from the first magnetic head of the reading unit and an information representative of an aimed address and to lower the travelling speed of the magnetic tape when the two outputs are coincident.
Inventors
- 👤 M Kubo
- 👤 Y Shinomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:20
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/005; G11B20/00; G11B20/10; G11B5/00; G11B5/48; G11B5/488; G11B5/4893
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
Magnetic tape memory apparatus composed of a writing unit and a reading unit; said writing unit comprising a magnetic tape feeding device, first and second writing magnetic heads which are juxtaposed along the travelling direction of a magnetic Tape so that the directions of magnetization thereof may intersect each other, and a change over logical circuit which feeds data to said first writing magnetic head when the bit level of an address is ''''1'''' and to said second writing magnetic head when it is ''''0'''' and which thereby stores them on said magnetic head; said reading unit comprising first and second reading magnetic heads which individually read the information stored on said magnetic tape, means to combine outputs from said first and second reading magnetic heads to thereby reproduce said data, and means to compare an output from said first magnetic head of said reading unit and an information representative of a designated address in order to lower the travelling speed of said magnetic tape when said output and said information coincide.
Claim 2
Dependent Claim
172 words
Magnetic tape memory apparatus composed of a writing unit and a reading unit; said writing unit comprising a magnetic tape feeding device, first and second writing magnetic heads which are juxtaposed along the travelling direction of a magnetic Tape so that the directions of magnetization thereof may intersect each other, and a change over logical circuit which feeds data to said first writing magnetic head when the bit level of an address is ''''1'''' and to said second writing magnetic head when it is ''''0'''' and which thereby stores them on said magnetic head; said reading unit comprising first and second reading magnetic heads which individually read the information stored on said magnetic tape, means to combine outputs from said first and second reading magnetic heads to thereby reproduce said data, and means to compare an output from said first magnetic head of said reading unit and an information representative of a designated address in order to lower the travelling speed of said magnetic tape when said output and said information coincide.
Claim 3
Dependent Claim
172 words
Magnetic tape memory apparatus composed of a writing unit and a reading unit; said writing unit comprising a magnetic tape feeding device, first and second writing magnetic heads which are juxtaposed along the travelling direction of a magnetic Tape so that the directions of magnetization thereof may intersect each other, and a change over logical circuit which feeds data to said first writing magnetic head when the bit level of an address is ''''1'''' and to said second writing magnetic head when it is ''''0'''' and which thereby stores them on said magnetic head; said reading unit comprising first and second reading magnetic heads which individually read the information stored on said magnetic tape, means to combine outputs from said first and second reading magnetic heads to thereby reproduce said data, and means to compare an output from said first magnetic head of said reading unit and an information representative of a designated address in order to lower the travelling speed of said magnetic tape when said output and said information coincide.
Claim 4
Dependent Claim
172 words
Magnetic tape memory apparatus composed of a writing unit and a reading unit; said writing unit comprising a magnetic tape feeding device, first and second writing magnetic heads which are juxtaposed along the travelling direction of a magnetic Tape so that the directions of magnetization thereof may intersect each other, and a change over logical circuit which feeds data to said first writing magnetic head when the bit level of an address is ''''1'''' and to said second writing magnetic head when it is ''''0'''' and which thereby stores them on said magnetic head; said reading unit comprising first and second reading magnetic heads which individually read the information stored on said magnetic tape, means to combine outputs from said first and second reading magnetic heads to thereby reproduce said data, and means to compare an output from said first magnetic head of said reading unit and an information representative of a designated address in order to lower the travelling speed of said magnetic tape when said output and said information coincide.
Claim 5
Dependent Claim
43 words
Magnetic tape memory apparatus according to claim 1, wherein said first and second writing magnetic heads and said first and second reading magnetic heads are respectively arranged so that the directions of magnetization thereof may intersect substantially at right angles each to other.
Claim 6
Dependent Claim
119 words
Magnetic tape memory apparatus according to claim 1, wherein said writing unit comprises a first shift register to which said data are supplied, a second shift register to which the address signal is supplied, a clock generator for feeding clock pulses to said first and second shift registers, a first gate to which the outputs of said first and second shift registers are supplied, an inverter which inverts the output of said second shift register, a second gate to which the output of said inverter and that of said first shift register are supplied, and means to control the magnetizing current which is supplied from said first and second gates to said first and second writing magnetic heads, respectively.
Claim 7
Dependent Claim
45 words
Magnetic tape memory apparatus according to claim 3, further comprising a frequency divider which divides the frequency of the output of said clock generator at a predetermined ratio to expand its pulse width, thereby to supply the divided frequency signal to said second shift register.
Claim 8
Dependent Claim
155 words
Magnetic tape memory apparatus according to claim 1, wherein said reading unit comprises first and second wave-form shapers to which outputs from said first and second reading magnetic heads are respectively supplied, an OR circuit to which the outputs of said first and second wave-form shapers are supplied, a buffer register which stores the output of said OR circuit, a low pass filter to which the output of said first reading magnetic head is supplied, means to reproduce the address signal from the output of said low-pass filter, a third register storing an address signal corresponding to desired data, a coincidence circuit which compares the output of said reproducing means and that of said third register, and a speed control circuit which controls said magnetic tape so as to feed at high speed when there is no coincidence output from said coincidence circuit and to feed at low speed when said coincidence output is occured.
Claim 9
Dependent Claim
165 words
Magnetic tape memory apparatus according to claim 1, wherein said reading unit comprises first and second wave-form shapers to which outputs from said first and second reading magnetic heads are respectively supplied, an OR circuit to which the outputs of said first and second wave-form shapers are supplied, a buffer register which stores the output of said OR circuit, a low-pass filter to which the output of said first reading magnetic head is supplied, means to reproduce the address signal from the output of said low-pass filter, an operating circuit which provides the precedent address signal preceding by predetermined number of bits to the address signal corresponding to desired data, a coincidence circuit which compares the output of said reproducing means and that of said operating circuit, and a speed control circuit which controls said magnetic tape so as to feed at high speed when there is no coincidence output from said coincIdence circuit and to feed at low speed when said coincidence output occurs.
Claim 10
Dependent Claim
118 words
Magnetic tape memory apparatus according to claim 5, wherein said speed control circuit comprises a relay coil which is connected between the positive terminal of a relay power source and the earth, a transistor which is connected between the positive terminal of said relay coil and the earth and which has the output of said coincidence circuit supplied to its base, and a contact arrangement which is closed upon energization of said relay coil, to couple a high speed feeding terminal of a power source for feeding said magnetic tape and a motor for feeding said magnetic tape, and which effects change-over to a low speed feeding terminal of said power source upon deenergization of said relay coil.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |