SU369613A1 - METHOD OF LOWER MAGNET RECORDING - Google Patents

Description

The invention relates to the field of automation and computing.

Methods are known for horizontal magnetic recording of information with a nominal magnetic head, in which the magnetic field of a recording varies along the width of the working gap from a certain minimum value from one edge of the head to a maximum value from the other edge. At the same time, the magnitude of the magnetic field at any point of the working gap depends on the amount of the write current that is generated through the winding of the head. For line recording, initially, the greatest current, which is sufficient for magnetization up to the height of the magnetic carrier across its entire width, is fed into the winding of the head.

The known method is energetically uneconomical, since it is necessary to create a large floor with a magnetic head.

In addition, large fields cause the magnetic field to spread over the working gap, which reduces the resolution when recording in the direction of movement of the magnetic carrier.

The proposed method is based on the fact that in it the width of the recording area - the active head section - is reduced regardless of the magnitude of the write current and the erasure. In this case, the current pulses are erased and are supplied constant in size and independent of the width of the active2

head section, and the write current pulses change depending on the level of the recorded signal. FIG. Figure 1 shows one of the possible constructive schemes for a magnetic head with a varying width of the active region; in fig. 2 - the principle of the magic head in the recording process; in fig. 3 and 4 - time diagrams.

The proposed method can be implemented with Pomonghiu, an agitator head with a varying width of the active section in the case when the width of the active section in the process of recording information on a single line is reduced from the maximum, and its width is minimal.

The head consists of a conductor / with leads 2 and 3, a photo-optical plastine 4 and an optical system (not shown), which creates a flow of singing 5. The photo-conductor plate has a reliable electrical contact over the entire length of the conductor. Illumination of the plastia is carried out by a uniform stream of light, the boundary 6 of which is displaced in the direction of the Y axis.

During the recording of a single line, the illuminated area of the plate changes from zero to the maximum value.

To write such a head to pins 2 and

3 connect the current source. With this current

The recordings pass through the conductor and the illuminated areas of the photoconductive plastic that are wired un-conductive. As the illuminated area of the photoconductor plate changes, the length in the active part of the (non-triggered) head also changes. In the case where the entire photoconductor plate is illuminated, the width of the active region is zero and no recording is made.

The recording of information is illustrated by timing charts of pulse and magnetization distribution in the carrier for various moments.

The value of "1 corresponds to the magnetization -j-Br, and the value of" On - magnetization - Br. Each width of the active region corresponds to two pulses: an erase / c pulse and a write pulse b.

To record information, the erase and write current pulses are sequentially passed through the head. At the moment of time t, an erasing current is passed through the active section, which re-magnetises the entire line of the carrier into the -Wr state. At time t / 2, a write current «1 is created, which remagnetizes the entire line to the state + Br. After that, the width of the active region is reduced, and at time / 3 the carrier remaining under the active region is re-magnetized to the state -Br, which corresponds to "O, and the magnetic carrier state remains unchanged until reduce by one more step and at the moment / o the part of the carrier peremagnetizes to the state -f-Sr, etc.

Thus, it is possible to record the entire string without distortion. With the transition to a new line entry, the entire process is repeated.

FIG. 4 shows timing diagrams for the case of recording multi-level information. In this case, the erase pulse is applied every time a transition is made to a new entry. The formation of a hidden magnetic image is the same as in the case shown in FIG. 3

The measurement of the width of the active part of the head should be synchronized with the flow of the write and erase currents to the head.

For the implementation of the method, various types of magnetic heads can be used, in which the width of the active region varies regardless of the levels of write and erase currents.

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Subject invention

The method of horizontal magnetic recording based on the sequential impact of unipolar erasable pulses and recording pulses of opposite polarity on the magnetic carrier while reducing the width of the non-magnetic band of the magnetic carrier, characterized in that, in order to improve the recording quality, the width of the magnetic band of the magnetic carrier is reduced regardless of the magnitudes of the erase pulses and underscore and successively affect the amplitude constant erase pulses and alternating

with them, varying in magnitude depending on the level of the recorded signal, write pulses.

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