JPS6367018A - Magnetic induction type key device - Google Patents

Abstract

PURPOSE:To prevent a read error by providing not only a key code use vegand wire but also a reference signal use vegand wire, in a key device in which a vegand wire is placed on a rotor, and it is rotated against a detecting unit, and executing a window by a detecting signal of this reference signal use vegand wire. CONSTITUTION:A key code use vegand wire train 7a and a reference signal use wire train 7b are placed at an interval of 180 deg. on a rotor 3. When a grip is held and pressed in the inserting direction, the rotor 3 rotates, and a vegand wire 7 allows detecting coils 21a, 22a to generate a voltage. By the detecting coil 22a, a reference signal is detected, and a window pulse generating circuit 35 is allowed to generate a window pulse for deciding a key code which has been detected by the detecting coil 21a. Accordingly, it does not occur that the key code is read wrongly due to a difference of an inserting speed of a key.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetically sensitive key device that generates a key code by an electromagnetic method, and more particularly to a magnetically sensitive key device using Wiegand wire.

(Prior Art) In order to generate and read key code signals with a simple configuration without using a power source such as a battery, a key using a magnetic material with a special structure called Wiegand wire has been proposed ( JP-A No. 55-155879).

Wiegand wire is made by applying a special treatment to a certain sleeve alloy to make the core part soft magnetic and the surface part hard magnetic. According to such a Wiegand wire, the magnetization direction of the core part can be changed by an external magnetic field, and by matching or reversing the magnetization direction of the core part and the magnetization direction of the surface part, the Wiegand wire can be changed. The magnetic flux passing through can be made to have a large change.

By making such a sudden change, a relatively large voltage can be induced in the detection coil.

(Problem to be solved by the invention) However, when inserting a key embedded with such a Wiegand wire into a key hole equipped with a detection part on the code reading side, it is necessary to set the key in order to read the key code correctly. It was necessary to send it quickly. Therefore, a constant speed feeding mechanism must be provided on the reading side, which poses a problem that the system itself becomes complicated and expensive.

(Means and effects for solving the problem) In order to achieve the objective [-1], according to the present invention, the magnetic flux generated is increased or decreased by changing the magnetization direction in accordance with the change in the polarity of the external magnetic field. A detection module including a key in which a plurality of Wiegand wires are arranged, a pair of magnets that force a change in the magnetization direction of each Wiegand wire of this key, and a detection coil arranged in the middle, and a detection (ii) of this detection module. In the magnetically sensitive key device, the Wiegand wire has a cylindrical shape and a control circuit that determines whether the key code of the key matches a pre-stored key code based on ``3 and instructs unlocking. The Wiegand wire arrays are arranged along the cylindrical surface of the rotating body and extend in the axial direction of the rotating body, and the arranged Wiegand wire arrays include two types: a key code wire array and a reference signal wire array. , the rotating body is rotatable with respect to a grip for holding a key, the detection module is arranged corresponding to each of the key code wire row and the reference signal wire row, and the control circuit includes a wind pulse generation circuit that generates a wind pulse based on the detection signal from the reference signal wire array.

According to such a configuration, the signal width of the reference signal changes in accordance with the key insertion speed, and the presence of the key code can be confirmed using this reference signal.

(Example of the invention) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that in each figure, the same reference numeral indicates the same object.

FIG. 1 shows a magnetically sensitive key of a magnetically sensitive key device according to an embodiment of the present invention. According to the drawing, this magnetically sensitive key includes a grip (1), a pivot shaft (2), and a rotating body (
3) is the main component. The grip (1) is a part for holding a key, and has a roughly cylindrical shape.

The interior of this grip (1) is hollow and can accommodate, for example, an emergency profile key (4) (a conventional mechanical key) as shown in this embodiment. This profile key (4) has a block (4a) that serves as a lid for the grip (1) in a portion opposite to the key profile (4b). This block (4a) and grip (
1) have screws (la) and (4c) cut inside, respectively, so that they can be screwed together. Normally, the profile key (4) is stored with this screw connection, but if the magnetically sensitive key of this invention cannot be used due to some malfunction, the key (4) can be removed from the grip (1). You can open and close the key. The grip (1) can also be used as a part that combines a radio, a clock, a lighter, etc.

The pivot shaft (2) is a substantially cylindrical member for supporting and guiding the rotating body (3). The pivot shaft (2) is connected to the grip (1
), and a second part (2b) having a smaller diameter than the first part (2a), which part (
2a) and (2b) are also hollow. A screw (2C) is cut on the inner surface of the end of the first part (2a), and a grip (
It is screwed together with the screw (1b) cut on the small diameter end surface of 1). That is, when the grip (1) and the pivot shaft (2) are combined, their surfaces are flush with each other. An elastic member (5) bent into a U-shape is inserted into the first part (2a) and the second part (2b), and large and small protrusions (5a) and (5b) are inserted into each part ( 2a),
It protrudes from the surface of (2b). Second part (2b)
As shown in FIG. 2, a spiral groove (8) is formed on the surface. In addition, in the second part, spring page 1, which will be described later.
The hollow portion for receiving the elastic member (5) and the hollow portion for receiving the elastic member (5) are separated by a partition wall (2d).

The rotating body (3) has a cylindrical shape with one end closed and the other open, and Wiegand wires (7) arranged along its surface and extending in the axial direction are embedded therein. According to this embodiment, as shown in FIG. 3, the Wiegand wire (7) is
A key code Wiegand wire array (7a) arranged corresponding to the key code signal to be generated, and a reference signal generation Wiegand wire array (7a) arranged at equal intervals to generate a reference signal for reading the key code. 7b).

The key code Wiegand wire row (7a) and the reference signal generation Wiegand wire row (7b) are arranged 180 degrees apart from each other with respect to the central axis of the cylinder, and the key code Wiegand wire row (7a) is Two adjacent reference signal generation Wiegand wires (7b) are positioned between the sandwiched fan-shaped arcs. Therefore, if the key code Wiegand wire (7a) exists between the fan-shaped arcs sandwiched between the two adjacent reference signal generation Wiegand wires (7b), a logic "1" is displayed, and the presence If not, logical rOJ can be displayed. Note that in order to make the key code difficult to read, a general soft magnetic wire that does not have the Wiegand wire effect may be provided for the logic "0". In addition, in order to configure a start bit indicating the starting point of the signal at the end of the Wiegand wire (7b) for generating the reference signal, a start bit of 1 (2 tree start bits arranged at I intervals) and a river Wiegand A wire (7c) is present.

The open end side of the rotating body (3) is provided with a guide bin (8) that protrudes radially inward from the cylindrical surface. An engagement pin (8) extending in the axial direction is formed inside the closed end of the rotating body (3), and includes a washer (10a).
A compression spring (1o) is also provided. The other end of this spring (lO) is connected to the second part (2b) of the pivot shaft (2).
) into the hollow. In addition, a protrusion (5b
) is formed with a fitting groove (11) for fitting.

In this way, by interposing the spring (1o) and engaging the guide pin (8) of the rotating body (3) with the spiral groove (6) of the pivot shaft (2), the embodiment of the present invention is realized. Complete the magnetically sensitive key.

Figure 4 shows an opening/closing body (1) using such a magnetically sensitive key.
B) Shows a key code inspection device installed on a door (for example). According to the figure, a key hole (17) of an opening/closing body (16) that receives a rotating body (3) of a magnetically sensitive key;
A bearing (18) is arranged at the bottom of the key hole (17) to facilitate the rotation of the rotating body (3), and a Wiegand wire for changing the magnetic flux of the Wiegand wire array (7a) for the key code and for generating a reference signal. It includes first and second detection modules (21) and (22) that respectively synchronously detect changes in the magnetic flux of the wire array (7b). Bearing (18
) has a central portion complementary to the shape of the tip portion of the rotary body (3) so that it can abut and support the rotary body (3) of the key. Each detection module (21), (22) is spaced 90 degrees apart from each other by 180 degrees. In addition, detection modules (21), (22)
each has two magnets and one sensing coil. According to such detection modules (21) and (22), first, the first magnet directs the magnetization of the core, that is, the soft magnetic portion, and the hard magnetic portion of the surface in the same direction. Next, a second magnet with a different polarity from the first magnet approaches, but the strength of this second magnet overcomes the interaction of the magnetic field between the other parts and the core, and the magnetic polarity of the core of the Wiegand wire changes. switch suddenly. Detection coil (2ta), (2
A relatively large voltage pulse can be generated in 2a).

According to the above configuration, by inserting the key into the key hole (17) and pressing the grip (1) in the key insertion direction, the tip of the rotating body (3) can be rotated by the bearing (18). The guide pin (8) of the rotating body (3) is supported by the pivot shaft (2). 1Illi whirling groove (6
), and thus the rotating body (3) rotates. When this rotation is completed, the elastic member (5) of the pivot shaft (2)
It can be seen that the protrusion (5b) of ) fits into the first matching groove (11), and the key operation is completed. In the next key operation, by pressing the protrusion (5a), the fitting groove (11) and the protrusion (5a) are pressed.
b) is released, and due to the action of the compression spring (10), the rotating body (3) assumes the shape 1n shown in FIG. As can be understood from the above, the rotation speed of the rotating body (3) is determined by the spiral groove (
6), but in this embodiment, the rotating body (3) is configured to move the entire stroke with one key operation, and at this time, the rotating body (3) rotates once. .

FIG. 5 shows a control circuit for reading and determining a key code using such a magnetic sensitive key (FIG. 1) and a detection module (FIG. 4). This control circuit will be explained with reference to the timing chart of FIG.

The detection coils of each detection module (21) and (22) (
Since the output voltages of 21a) and (22a) may contain external noise, they are each processed by a noise discrimination circuit (
These noises are removed in steps 31) and (32). Also,
Since the waveform of the generated voltage is blunted due to the inductance of the detection coils (21a) and (22a) themselves, the waveform amplification and shaping circuits (33) and (34) respectively shape them into pulse signals as shown in Figure 6. . Here, the output of each waveform amplification shaping circuit (33), (34) is, for example, as shown in FIG.
) and (b). Among these output signals, the pulse signal generated by the reference signal generation Wiegand wire (7b) is generated by the wind pulse generation circuit (35) as shown in FIG.
0) is converted into a rectangular pulse. This rectangular pulse can be configured by a combination of an inverter, a multivibrator, etc. activated by the start bit pulse.

The key code determination circuit (36) performs an AND operation between the output pulse of the wind pulse generation circuit (35) and the output pulse of the waveform amplification shaping circuit (33) generated by the key code Wiegand wire (7a). The key code pulse (Fig. 6(d)) is obtained by calculating the logic. Thereafter, it is determined whether the key code included in this key code pulse matches the key code stored in the memory (37), and if they match, the actuator (
39) to lock or unlock the opening/closing body (1B) (Fig. 4). If they do not match, the output circuit (3
day) is not activated.

Next, the operation of this embodiment will be explained.

When the magnetic sensitive key shown in Fig. 1 is inserted into the key hole (17) of the opening/closing body (1o) and pressed in the insertion direction with the grip (1), the rotating body (3) is moved as shown by arrow A in Fig. 4. Rotate like this. Due to this rotation, the Wiegand wire for key code generation (7a) and the Wiegand wire for reference signal generation (7b) are connected to the detection t11 module (21), (
22), and each module (21), (
Voltages corresponding to FIGS. 6(a) and 6(b) are generated in the detection coils (21a) and (22a) of 22), respectively. As a result, the operation of the actuator (39) is determined as explained in the above control circuit, and the key code is -.
If they match, locking or unlocking of the opening/closing body is executed, or if they do not match, the locking or unlocking is not executed.

In this case, it will be seen that the reference signal for detecting the key code is always valid, since even if the key insertion speed changes, the pulse width of the wind pulse changes correspondingly. In other words, the key code will not be read incorrectly due to differences in key insertion speeds.

In the embodiments described below, the rotation of the rotating body is promoted by a mechanical structure, but electrical means such as a motor may also be used. The angle seen from the center axis of the rotating body where the Wiegand wires are distributed can also be set to 80 degrees or more as in this embodiment, or 80 degrees or less.

(Effects of the Invention) According to the present invention, the key operation speed can be adjusted by providing two types of Wiegand wires, one for the key code and the other for the reference signal, arranged on the surface of the cylindrical rotating body as described below. It is possible to obtain a highly reliable magnetically sensitive key device having a simple and compact structure, which allows a key code to be read reliably without any interference. Further, according to the magnetically sensitive key device of the present invention,
No power supply is required to generate and read the key code signal.

4. Detailed Description of the Invention FIG. 1 is a vertical cross-sectional view of a magnetically sensitive key which is the main part of a magnetically sensitive key device according to an embodiment of the present invention, and FIGS. 2 and 3 are examples of the present invention. FIG. 4 is an explanatory diagram of a main part of a magnetically sensitive key device according to an embodiment of the present invention, and FIG. FIG. 6, which is an explanatory diagram of another main part of the detection system of the expression key device, is a timing chart showing the output waveforms of each part of FIG. 5.

In the drawing, (1) is the grip, (2) is the pivot shaft, (
3) is a rotating body, (4) is a profile key, (5) is an elastic member, (6) is a spiral groove, (7) is a Wiegand wire, (7a) is a key code wire row, and (7b) is a reference. The signal wire row (8) is a guide bin.

Claims (7)

[Claims] (1) A key with multiple arrays of Wiegand wires that increase or decrease the magnetic flux generated by changing the magnetization direction as the polarity of the external magnetic field changes, and a pair that forces the magnetization direction of each Wiegand wire of this key to change. a detection module including a magnet and a detection coil arranged between the magnets;
A magnetically sensitive key device comprising a control circuit that determines whether the key code of the key matches a pre-stored key code based on the detection signal of the detection module and instructs unlocking. The Wiegand wires are arranged along the cylindrical surface of a cylindrical rotating body so as to extend in the axial direction of the rotating body, and the arranged Wiegand wire rows are a key code wire row and a reference signal wire row. The rotating body is rotatable with respect to a grip for holding a key, and the detection module is arranged corresponding to each of the key code wire row and the reference signal wire row. . The magnetically sensitive key device according to claim 1, wherein the control circuit includes a wind pulse generation circuit that generates a wind pulse based on a detection signal from the reference signal wire array. (2) In the device according to claim 1, each wire of the key code wire row among the Wiegand wires is spaced approximately 180 degrees apart from each other in the direction of two adjacent wires of the reference signal wire row. A magnetically sensitive key device characterized by being located on an arc of a shape. (3) A magnetically sensitive key device according to claim 2, wherein the reference signal wire array includes a start bit wire at an end thereof. (4) A magnetically sensitive key device according to claim 3, wherein the start bit wire comprises two Wiegand wires arranged at a shorter interval than other wires. (5) The device according to any one of claims 1 to 4, wherein the rotating body is hollow and includes a guide pin extending radially inward from the cylindrical surface,
The grip includes a pivot shaft that supports the rotating body and has a helical groove on the surface for guiding the guide pin,
guiding the guide pin of the rotating body along the spiral groove of the pivot shaft by pressing the grip in the direction of the rotation axis of the rotating body, and rotating the rotating body with respect to the pivot shaft; A magnetically sensitive key device featuring: (6) A magnetically sensitive key device according to any one of claims 1 to 5, wherein the rotating body is rotated by a motor. (7) A magnetically sensitive key device according to any one of claims 1 to 6, wherein the grip has a housing portion for a profile key.