JPS5885226A - Pulse signal generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse signal generator using a magnetically sensitive element made of a special ferromagnetic material having a nodal portion and a soft portion of magnetization characteristics.

First, in order to understand the present invention, an outline of the above-mentioned magnetic sensing element used in the present invention will be explained.

For example, when a ferromagnetic wire such as Bicaloy is processed by applying an external force such as twisting, tension, or bending, when an external magnetic field is applied to it, the rate of magnetic flux change of the external magnetic field depends on the type of ferromagnetic material. It has the property of generating a pulse electromotive force of a substantially constant magnitude that is not dependent on the current.

Such a ferromagnetic wire has, for example, a relatively hard magnetic anisotropy with a large coercive force Hc near the wire core, and a relatively soft magnetic anisotropy with a small coercive force and a high residual magnetism Br as it approaches the outer periphery. It has been treated to have magnetic anisotropy. It may also be a clad wire with a combination of hard and soft magnetic properties. Alternatively, it may be a planar structure in which a layer with hard magnetic properties and a layer with soft magnetic properties are laminated.

The entirety of such a ferromagnetic material is magnetized in the positive direction by a cent magnetic field in advance, and with the action of the set magnetic field deenergized, only the soft part is selectively magnetized in the opposite direction to the set magnetic field. When a small reset magnetic field and a set magnetic field that re-magnetizes the soft portion in the positive direction are applied in sequence, the magnetization action triggers the soft portion to dislocate all at once and rapidly, resulting in a magnetic field near the ferromagnetic material. induces a steep pulse in a sense coil placed at

Conventionally, pulse generators using such magnetically sensitive elements are
In general, this method uses a method in which the set magnets are moved closer and farther apart, resulting in a complex structure.Also, since a set magnet that is stronger than the reset magnet is used, it is difficult to construct a compact and precise structure. ing.

The present invention solves these problems and makes it possible to use a pulse signal generator using a magnetically sensitive element in, for example, push-button switches for electronic computers and other electronic devices.

Hereinafter, ferromagnetism and wire (hereinafter referred to as wire) are used as magnetically sensitive elements.
The case where this is used will be explained with reference to the drawings.

As shown in FIG.
When a pulsed excitation magnetic field (or a half-wave alternating current or half-wave alternating current) lx is applied, a pulsed excitation magnetic field (or a half-wave alternating current magnetic field) Hx is generated, as seen in the t1 region of Fig. 2, which moves the wire 1 in a certain direction (for example (toward the right in the drawing). Such a magnetic field is a magnetic field that magnetizes the wire only in a certain direction, and the wire 1 is
Since it has not been reset in advance, sense coil 3
does not induce pulse output.

However, when the reset magnet 4 whose magnetization direction is opposite to Hx is brought close to the wire 1 from the outside as shown in FIG. As shown, Hx is reduced and weakened by that amount, but the reduced set magnetic field Ha has a sufficient magnitude to excite the wire 1.

During the time when the wire is not acting, the reset magnetic field oil acts on the wire 1 and reverses the magnetization direction of the soft portion of the wire 1. In this way, once the wire 1 is reset, the magnetization direction of the soft part of the wire 1 is rapidly reversed at the rise of the next magnetic field 1 (s), so the second
As shown in the figure, pulse output 1 is induced. Of course, the pulse output (2) is induced also at the falling edge of H3.

When the reset magnet 4 is moved away, the magnetization becomes like that in the t1 region, and as described above, no pulse is output. Therefore, if the wire 1 and coils are fixed and the magnet 4 can be moved up and down using a push button and a return spring, it becomes a push button type pulse signal generator, which can be used for example in electronic computers and other electronic devices. Can be widely used in switches. In this case, if the pulse current Ix is applied to many of the pulse signal generators of the present invention when the main switch of the device is turned on, each time a push button is pressed, the reset magnet 4 is connected to the wire. Since it is close to 1, a pulse train can be output. In addition, if a single output pulse signal is required when a push button is pressed instead of a pulse train, input the first pulse output v1, and then input the next pulse output v2 or ■1 signal. It is sufficient to add an electronic circuit that interrupts the pulse train and maintains that state until the end of the pulse train.

In addition, when using a large number of pulse signal generators shown in FIG. 1 in a connected manner, for example, as shown in FIG. 6, a common excitation coil 2 is wound over the entire length of a common long wire 1. It is also possible to arrange the sense coil 3 and the reset magnet 4 in opposition to each section and make each of them function independently.

Furthermore, in order to reduce the stroke of the push button or the reset magnet 4, it is effective to arrange a retainer 5 for a closed magnetic path as shown by the imaginary line in FIG.

In the case of the present invention, the set magnet is brought close to the conventional ship,
There is no need to move it away, so it is structurally simple.
Since it is small and can be constructed precisely, it is effective for use in push-button switches for electronic computers, for example.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a waveform diagram showing the relationship between magnetic field and pulse output, and FIG. 3 is a diagram showing an example of application of the present invention. 1 Wire 2: Excitation coil 3゛Sense coil 4: Reset magnet

Claims (1)

[Claims] A coil for generating an excitation magnetic field Hx is wound around a magnetic sensing element made of a ferromagnetic material that has hard and soft magnetization characteristics, and a pulse current or half-wave alternating current is passed through this to generate the magnetic sensing element. The element is intermittently excited in a certain direction, and a reset magnet having a magnetization direction opposite to the excitation direction is brought close to the magneto-sensitive element, so that the magneto-sensitive element is activated during the time when the excitation magnetic field Hz is not acting. The magnetization direction of only the soft part is reversed and reset, and when the next excitation magnetic field rises or expands and falls, the magnetization direction of the soft part of the magnetically sensitive element is reversed, and the sense placed near the magnetically sensitive element is A pulse signal generator that induces output pulses in a coil.