DE1270111B - Magnetic signal carrier - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

Gilb

German KL: 21 al-37/30

Number: 1270111

File number: P 12 70 111.0-53

Filing date: March 18, 1965

Opening day: June 12, 1968

It is known to use position signals to control machines that are generated with the aid of Hall generators are queried by magnetic memories (plus-minus voltage). The ones known so far Arrangements have disadvantages, e.g. too little steepness. This allows z. B. the condition

Magnetic signal carrier

Ur < 0.01

aU

dx

where Ur is a remanent voltage, or

you

U ₀ < 0.01

dx

where U _{0 is} a temperature-dependent Hall voltage, cannot be implemented.

Furthermore, there is a special type of recording of magnetic signals on a magnetic carrier, known as "variable area recording". Here is first a Track magnetized in one direction and then remagnetized in the opposite direction. A magnetization is thus obtained which corresponds to the longitudinal magnetization.

The invention relates to a magnetic signal carrier for contact and non-contact generation an exact position signal for the electronic control, especially for controlling machine tools, with the help of pre-magnetized magnetic tapes with signal marks of opposite polarization direction and acceptance heads with Hall generators. According to the invention, the magnetic tape has a three-part, transversely magnetized bias track provided in which the polarization direction of the central part of the polarization direction of the two outer parts is opposite. One or more three-part, transversely magnetized magnetic signal marks with one opposite to the bias track Direction of polarization applied.

The Hall generator is influenced by the magnetic signal carrier according to the invention largely avoided by neighboring magnetic tapes. Also has the plus-minus signal voltage a precisely localized and steep zero crossing. Furthermore, precommands can be issued from the same signal be derived.

The invention is intended to be even more detailed using the exemplary embodiment shown in the drawing explained. It shows

1 shows a schematic representation of a premagnetized Magnetic tape with applied magnetic signal according to the invention,

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, 8520 Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:

Walter Heissmeier,

Karl Klein,

Wolfgang Wagnerberger, 8500 Nuremberg

Fig. 2 in a schematic representation of the force flow curve on the signal carrier according to the invention and a pick-up head above the signal carrier,

ao Fig. 3 graphically shows the signal voltage curve at the pick-up head as a function of its distance from the magnetic signal.

In Fig. 1, a signal carrier according to the invention is shown schematically. 11 denotes a magnetic tape, 12 denotes the bias on the magnetic tape and 13 denotes the magnetic signal mark with a magnetization direction opposite to the bias.

From Fig. 2, the course of the force flux in the magnetic tape and the arrangement of the pick-up head to the signal carrier according to the invention can be seen. With 21 the magnetic tape is designated. The arrows 22 show the course of the force flow at a greater distance from the signal mark 23. The force flow in the immediate vicinity of the signal mark is indicated by the arrows 24, 25, 26 and 27. The reference number 28 shows a schematic representation of a removal head which consists of the ferrite plates 29, a Hall generator 210 and the air gap 211 . The terminals 212 on HaIlgenerator 210 is used for supplying the control current or to decrease the signal voltage U ₈ (Hall voltage).

From the arrangement of the pick-up head in relation to the signal carrier it can be seen that only the flow of force indicated by the arrows 24 and 25 can be effective in the air gap 211.

From Fig. 3 is the signal voltage curve at the pick-up head as a function of its distance from the magnetic signal.

The distance s is plotted on the abscissa and the signal voltage U _{s is} plotted on the ordinate. The curve 31 shows the course of the signal voltage.

809 559/344

Moves ζ. B. the pick-up head coming from the left in the direction of the magnetic signal mark, like this initially no magnetic flux acts on the pick-up head at a sufficiently large distance from the signal mark a. The signal voltage is zero or nearly zero. As the pick-up head approaches the magnetic signal mark, it comes into the area of action of the power flow 24 (Fig. 2). the Signal voltage initially rises to a maximum and then changes its sign when the pick-up head arrives in the area of the power flow 25 (FIG. 2). Here, too, the signal voltage reaches a Maximum. There is a zero crossing of the signal voltage between the two maxima. This zero crossing is characterized by a particularly high steepness,

Claims (1)

Claim: Magnetic signal carrier for non-contact and non-contact generation of an exact position signal for electronic control, especially for controlling machine tools, with the help of pre-magnetized magnetic tapes with signal marks of opposite polarization direction and pick-up heads with Hall generators, characterized in that the magnetic tape with a three-part, transversal magnetized bias track is provided, in which the polarization direction of the middle Part of the polarization direction of the two outer parts is opposite and that on the bias track one or more three-part, transversely magnetized magnetic signal markers are applied with a polarization direction opposite to the bias track. Considered publications:
Stewart, Magnetic Recording Techniques, New York, Toronto, London, 1958, pp. 25 and 26. 1 sheet of drawings 809 559/344 5.68 Q Bundesdruckerei Berlin