JPS6057778B2 - Electric pulse generating element signal transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for transmitting signals generated from an electric pulse generating element.

There are various electric pulse generating elements that have been used in the past.

For example, in one type of optical encoder,
When light is received by a light-receiving element, by operating a shutter installed between the light and the light-receiving element, the light is intermittently blocked, thereby creating brightness and darkness of the light and generating electrical pulses. . This method is widely used. There are also pulse generating elements that utilize magnetism.

Some types generate an electromotive force in a coil by rapidly bringing a permanent magnet close to a coil wound to a certain length. This method is also extremely common and has a wide range of applications, for example, being used in trigger pulse generating elements such as non-contact keyboard switches. Among the above-mentioned pulse generating elements utilizing magnetism, one that is particularly notable recently is the magnetic steel thin wire described in Japanese Patent Publication No. 52-13705.

This magnetic steel wire material is called Vicalloy (an alloy of vanadium and cobalt), and it is manufactured by mechanically and thermally treating a type of magnetic steel wire using a unique method. The center part of the wire is made of magnetic material and remains soft, while only the surface layer of the wire is made hard. When a magnetic field is applied to this fine wire in the axial direction from the outside, the direction of the magnetic field at the core suddenly reverses at a certain critical value, regardless of the speed of the magnetic field fluctuation. Therefore, if a pickup coil is provided on this line, a pulse voltage will be induced in this coil. In this way, a parasitic pulse generating element can be formed by varying the external magnetic field, and since the pulse voltage is also a high voltage close to IOV, this element is suitable for a wide range of applications.

The above magnetic steel wire (hereinafter referred to as magnetic wire) will be explained in more detail based on the accompanying drawings.

In FIG. 1, the magnetic wires 2 are each magnetizable metal wire, preferably of substantially uniform composition, forming a relatively soft core 4 and a relatively hard outer shell 6 with different magnetic properties. processed as follows. The magnetic wire 2 is then connected to an external magnetic field (also referred to as a magnetic field).

The same applies hereafter). Relatively hard outer shell 6
has sufficiently greater coercivity and coercivity than the relatively soft core 4, so that when the external magnetic field is removed, the outer shell retains its magnetism, and the outer shell retains its magnetism in the axial direction opposite to the direction of magnetization of the outer shell. The core is magnetically captured by reversing the magnetic field of the core 4. In this case, "magnetically capturing" the core means that the magnetic field generated outside the core can use the core as a flux path. More specifically, in one state, i.e. in the absence of an external magnetic field, the magnetic field of the shell 6 dominates the core 4 and magnetizes the core so as to complete a magnetic path through the core 4. do.

On the other hand, when an external magnetic field stronger than the magnetic field of the outer shell 6 and opposite to the direction of the magnetic field is applied to the core part 4, the external magnetic field is applied to the core part 4.
, and switches the magnetization direction of the core 4 so that the magnetic flux of the external magnetic field completes a magnetic path through the core 4. The fact that the magnetization direction of the core 4 is controlled by the magnetic field of the outer shell 6 or the opposite external magnetic field is said to mean that the core 4 is magnetically captured.

The above magnetic wire has the following general characteristics.

1 output can be increased. 2. Fast response.

3. It is lightweight, small, and inexpensive.

4. Wide temperature range.

5-input power supply is not required.

6 Higher S/N ratio than other sensors.

It is also possible to combine forward and reverse outputs of 7 pulses.

Although magnetic wires such as those described above will be used in an increasingly wide range of applications in the future, they are currently not used in automatic applications. Codes embedded in the pulse generator of a car distributor or in a credit card have been published in the literature.

By the way, there is no problem not only with the above-mentioned magnetic wire but also when transmitting electric pulse signals over short distances.
When transmitting a pulse signal with a fast rise over a long distance, various problems occur such as energy attenuation along the way and influence of induced noise.

Therefore, conventionally, processing has been performed near the pulse generator, and the range of application has been limited accordingly. The present invention has therefore been particularly devised to overcome the above-mentioned deficiencies, and it is an object of the present invention to provide a device which makes it possible to transmit pulse signals over long distances.

Briefly, by supplying the signal from the pulse generating element to a light emitting element with excellent responsiveness, the electrical pulse signal is first converted into an optical pulse signal, and this light is passed through the optical fiber cable. After that, at the end of the optical fiber cable, the light is received by a light-receiving element with excellent responsiveness, and the light is converted into electricity and used.

An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 4 is a route map showing an embodiment of the present invention. The pulse generating element 10 consists of the magnetic wire 2 already explained in FIG. The approach of an external permanent magnet with an opposite magnetic field to this magnetic wire causes a sudden reversal of the direction of the magnetic field in the core 4, so that a pulsed voltage is induced in the pick-up coil 8. Further, reference numeral 12 denotes a light emitting element, which is made of, for example, a light emitting diode, and the pickup coil 8 detects the pulse generated in the magnetic wire 2 and sends it to the light emitting element, whereby the pulsed current is converted into light.

Reference numeral 14 denotes an optical fiber cable, which is installed over a long distance between a light-receiving element 16 and the light-emitting element 12, which will be described later, and through which light 1 generated from the light-emitting element is transmitted to the light-receiving element 16. Ru. The light receiving element 16 is
For example, it is made of a phototransistor or the like, and converts the light 1 transmitted via the optical fiber cable 14 into electricity, which is then used for a desired purpose.

Since the present invention employs a light emitting element, an optical fiber cable, and a light receiving element configured as described above, the pulse signal generated by the pulse generating element can not only be transmitted over long distances, but also have a large amount of energy during transmission. It has the advantage that it causes less attenuation and is not affected by induced noise.

[Brief explanation of drawings]

The accompanying drawings illustrate one embodiment of the invention. FIG. 1 shows a side view of the magnetic wire, partially cut away. FIG. 2 is a schematic end view of FIG. 1. FIG. 3 is a side view showing a state in which the direction of the magnetic field in the core of FIG. 1 is reversed. Figure 4 is a route map of the pulse signal transmission device. l is light, 2 is magnetic wire, 4 is core, 6 is outer shell, 8 is pickup coil,
10 is a pulse generating element, 12 is a light emitting element, 14 is an optical fiber cable, and 16 is a light receiving element.

Claims (1)

[Claims] 1. By approaching the magnetic wire with a permanent magnet having a magnetic field stronger than the magnetic field of the outer shell of the magnetic wire and opposite to the direction of this magnetic field, the direction of the magnetic field at the core of the magnetic wire is reversed. The pulse generating element generated by
A light-receiving element connected to a light-emitting element that converts pulses from the pulse generating element into light and capable of converting light from the light-emitting element into electricity is installed separately at an appropriate distance from the light-emitting element, and the light-emitting element and the light receiving element are connected by an optical fiber cable capable of transmitting light.