SU968849A1

SU968849A1 - Method of determining recording and reproducing heads position in combined unit

Info

Publication number: SU968849A1
Application number: SU813294558A
Authority: SU
Inventors: Видунас Ионович Римкус; Юрий Николаевич Скибин; Юрий Сергеевич Епишкин; Ауксутис Аницетович Якштас
Original assignee: Ставропольский государственный педагогический институт
Priority date: 1981-05-27
Filing date: 1981-05-27
Publication date: 1982-10-23

Description

Изобретение относится к приборостроению, а именно к технике магнитной записи, и может быть использовано при определении параметров магнитных головок.The invention relates to instrumentation, namely to the technique of magnetic recording, and can be used in determining the parameters of magnetic heads.

Известен способ определения положения магнитной головки, основанный на записи на магнитном носителе нескольких отрезков двухдорожечной сигналограммы, лежащей внутри дорожки воспро- ¹изведения магнитной головки и содержащей сигналы с одинаковой частотой и амплитудой, а также одинаковым опережающим или отстающим фазовым сдвигом между сигналамй по различным дорожкам' одного и того же отрезка. Величины сигйалов, снимаемых с головки воспроизведения по различным отрезкам сигналограммы, сравнивают при одновременном воспроизведении с обеих дорожек £ 1) .Known method for determining the position of the magnetic head, based on recording on a magnetic medium a number of segments two-track waveform lying within the track reproduced product of the magnetic head ¹ and comprising signals with the same frequency and amplitude, and the same advancing or lagging phase shift between the various paths signalamy ' of the same segment. The values of the signals recorded from the playback head for different segments of the waveform are compared while simultaneously playing from both tracks £ 1).

Однако данный способ не позволяет определить взаимное расположение рабо2 чих зазоров в комбинированном блоке магнитных головок.However, this method does not allow one to determine the mutual arrangement of working gaps in the combined block of magnetic heads.

Известен также способ определения положения магнитных головок, основанный на записи ими немагнитном носителе контрольных сигналов с последующей их визуализацией [ 2 J .There is also a method of determining the position of magnetic heads, based on their recording of a non-magnetic carrier of control signals with their subsequent visualization [2 J.

Этот способ позволяет определить взаимное расположение рабочих зазоров магнитных головок записи и воспроизведения *в комбинированном блоке, однако для этого требуется ряд трудоемких операций, и, кроме того, указанный способ не обеспечивает достаточной точности измерений. .This method allows you to determine the relative position of the working gaps of the magnetic heads of the recording and playback * in the combined unit, however, this requires a number of time-consuming operations, and, in addition, this method does not provide sufficient measurement accuracy. .

Целью изобретения является повышение точности и упрощение процесса измерений.The aim of the invention is to improve the accuracy and simplification of the measurement process.

Поставленная цель достигается тем, что запись осуществляют одновременно головками записи и воспроизведения блока, контрольные же сигналы формируют в виде радиоимпульсов, длительность коThis goal is achieved in that the recording is carried out simultaneously by the recording and playback heads of the unit, while control signals are formed in the form of radio pulses, the duration of

96 торых равна времени перемещения магнитного носителя между рабочими зазорами головок записи и воспроизведения, а скважность равна двум, при этом частоты сигналов, подаваемых в головки записи и воспроизведения, отличаются в 2,0-3,0 раза.96 of which is equal to the time of movement of the magnetic medium between the working gaps of the recording and reproducing heads, and the duty cycle is two, while the frequencies of the signals supplied to the recording and reproducing heads differ by 2.0-3.0 times.

На фиг. 1 показан комбинированный блок магнитных головой, контролируемый по предлагаемому способу; на фиг. 24 — изображения проявленных сигналограмм.In FIG. 1 shows a combined block of magnetic heads controlled by the proposed method; in FIG. 24 - images of the developed signalograms.

Предложенный способ осуществляют в следующей последовательности (фиг. 1 и 2).The proposed method is carried out in the following sequence (Fig. 1 and 2).

Всеми магнитными головками записи и воспроизведения 2 на магнитном носителе 3 одновременно записывают радиоимпульсы. При этом радиоимпульсы 4 записывают магнитными головками 1 записи, в которые подают сигнал с частотой , а радиоимпульсы 5 записывают, головками 2 воспроизведения, в которые подают сигнал частотой £^=(2-3) .All magnetic recording and reproducing heads 2 on a magnetic medium 3 simultaneously record radio pulses. In this case, the radio pulses 4 are recorded by the magnetic heads 1 of the record into which the signal is supplied with a frequency, and the radio pulses 5 are recorded by the heads 2 of the reproduction into which the signal is supplied with the frequency £ ^ = (2-3).

Для обеспечения на магнитном носителе записи непрерывной последовательности радиоимпульсов необходимо, чтобы их длительность была равна времени -t = = (J прохождения магнитного носителя со скоростью V расстояния Б между рабочими зазорами головок 1 записи и головок 2 воспроизведения. При этом скважность ά радиоимпульсов должна быть равна двум. Записанную сигналограмму визуализируют одним из известных методов, после чего ширину и положение проявленных дорожек оценивают с помощью инструментального микроскопа.In order to ensure a continuous sequence of radio pulses on a magnetic recording medium, it is necessary that their duration be equal to the time -t = = (J of the magnetic carrier passing with a speed V of distance B between the working clearances of the recording heads 1 and the playback heads 2. At that, the duty cycle ά of the radio pulses must be equal The recorded signalogram is visualized using one of the known methods, after which the width and position of the developed tracks are evaluated using an instrumental microscope.

Сигналограмма может быть записана комбинированным блоком, у которого рабочие зазоры воспроизводящих головок хорошо совпадают с дорожками записи (фиг. 2). Рабочие зазоры головок воспроизведения могут смещены вверх относительно дорожек записи (фиг. 3). В этом случае часть рабочего.зазора головки воспроизведения не воспроизводит сигналограммы, записанной головкой записи данного комбинированного блока магнитных головок, и ЭДС воспроизведения такой головки при воспроизведении указанной сигналограммы меньше, чем при воспроизведении измерительной ленты. При настройке магнитофона с таким блоком головок уровень записи получается завышенным, вследствие чего, п'овы5 шаются нелинейные искажения или ухудшается частотная характеристика записи.The signalogram can be recorded with a combined unit, in which the working gaps of the reproducing heads are in good agreement with the recording tracks (Fig. 2). The working gaps of the playback heads can be offset upward relative to the recording tracks (Fig. 3). In this case, part of the working gap of the playback head does not reproduce the waveform recorded by the recording head of this combined unit of magnetic heads, and the EMF of reproducing such a head when playing the specified waveform is less than when playing the measuring tape. When setting up a tape recorder with such a block of heads, the recording level is overestimated, as a result of which non-linear distortions increase or the frequency response of the recording deteriorates.

Длина рабочих зазоров головок записи может быть меньше длины рабочих заЮ зоров головок воспроизведения (фиг. 4), При этом, также как и в предыдущем случае, ЭДС при воспроизведении собственной записи меньше, чем ЭДС при воспроизведении измерительной ленты, 15 что приводит к таким же, как и в предыдущем случае, недостаткам при настройке магнитофона.The length of the working clearances of the recording heads can be less than the length of the working clearances of the playback heads (Fig. 4). In this case, as in the previous case, the EMF when playing back your own record is smaller than the EMF when playing the measuring tape, 15 which leads to the same , as in the previous case, the disadvantages when setting up the tape recorder.

Описываемый способ позволит повы2о сить точность контроля качества блоков комбинированных магнитных головок и сократить трудозатраты, связанные с этим контролем.The described method will increase the accuracy of quality control of blocks of combined magnetic heads and reduce the labor costs associated with this control.

Claims

The invention relates to a device, namely to a magnetic recording technique, and can be used in determining the parameters of magnetic heads. A known method for determining the position of a magnetic head is based on recording on a magnetic medium several segments of a two-track signalogram lying inside the reproduction track of the magnetic head and containing signals with the same frequency and amplitude as well as the same leading or lagging phase shift between signals along different tracks of the same the same segment. The values of sigals taken from the playback head along different segments of the signal are compared with simultaneous reproduction from both tracks f 1. However, this method does not allow to determine the relative position of the working gaps in the combined block of magnetic heads. There is also known a method for determining the position of magnetic heads, based on their recording of a magnetic carrier of control signals with their subsequent visualization 2. This method allows you to determine the relative position of the working gaps of the magnetic recording and playback heads in a combination unit, but this requires a number of labor-intensive operations, and, moreover, this method does not provide sufficient measurement accuracy. The aim of the invention is to improve accuracy and simplify measurement process. This goal is achieved by recording at the same time the recording and reproducing heads of the block, while the control signals are formed as radio pulses, the duration of which is equal to the travel time of the magnetic media between the working gaps of the recording and reproducing heads, and the duty cycle are two. supplied to the recording and playback heads differ 2.0-3.0 times. FIG. 1 shows a combined block of magnetic heads, controlled by the proposed method; in fig. 24 shows images of recorded waveforms. The proposed method is carried out in the following sequence (Fig. 1 and 2). All magnetic recording heads 1 and 2 playback on the magnetic but the body 3 simultaneously record radio pulses. In this case, radio pulses 4 are recorded by magnetic recording heads 1, which are given a signal with a frequency, and radio pulses 5 are recorded by playback heads 2, which are signaled with a frequency, (2-3). . To provide a continuous sequence of radio pulses on a magnetic recording medium, it is necessary that their duration be equal to the time-B and the passage of the magnetic carrier at a speed V of distance 6 between the working gaps of the recording heads 1 and the playback heads 2. In this case, the duty cycle and radio pulses should be equal to two. The recorded waveform is visualized by one of the known methods, and then the width and position of the developed tracks are assessed using an instrumental microscope. The waveform recording can be recorded by a combination unit, in which the working gaps of the reproducing heads well coincide with the recording tracks (Fig. 2). The working gaps of the playback heads can be shifted upwards relative to the recording tracks (Fig. 3). In this case, a part of the working playhead of the reproduction head does not reproduce the waveforms recorded by the recording head of this combined magnetic head unit, and the emf of such head reproducing when playing the specified waveform is less than 9 when playing the measuring tape. When adjusting a tape recorder with such a block of heads, the recording level becomes too high, as a result of which nonlinear distortions increase or the frequency response of the recording deteriorates. The length of the working gaps of the recording heads may be less than the length of the working gaps of the playback heads (Fig. 4). At the same time, as in the previous case, the EMF when playing your own recording is less than the EMF when playing the measuring tape, which leads to the same disadvantages as in the previous case when setting up the tape recorder. The described method will improve the accuracy of quality control of blocks of combined magnetic heads and reduce the labor costs associated with this control. The formula for determining the position of magnetic recording and reproducing heads in a combination unit, based on recording control signals on a magnetic carrier with their subsequent visualization, is such that, in order to improve the accuracy and simplify the measurement process, recording is performed simultaneously by recording heads and playback of the block, the control signals are formed in the form of radio pulses, the duration of which is equal to the time of movement of the magnetic carrier between the working gap of the recording heads and reproducing, and the duty cycle is equal to two, the frequency of signals fed to the recording head and reproduction, characterized in 2,0-3,0 times. Sources of information taken into account in the examination of 1 Patent of Germany No. 2319441, cl. Q11 5/46, 10.02.77.

2. Household tape recorders. Test methods and measurements. GOST 17162-71. M .. 1977, p. 5.5, s, 8-9 (the prototype).

figure 1

FIG. 2