JPS6367017A - Magnetic induction type key - Google Patents

Abstract

PURPOSE:To execute generation and read of a key code by arranging a vegand wire so as to run along a cylindrical surface of a cylindrical rotor and to extend in the axial direction of this rotor, and rotating relatively the rotor against a detecting unit. CONSTITUTION:A rotor 3 is supported and guided by a pivotally supporting shaft 2, and the pivotally supporting shaft 2 is screwed mutually to a screw 1b which has been threaded on the surface of a small diameter end part of a grip 1, so that both surfaces become the same in a state that the grip 1 and the pivotally supporting shaft 2 have been combined. On the rotor 3, a vegand wire 7 for extending in the axial direction along its surface is arranged. The vegand wire 7 consists of a key code use vegand wire train 7a and a reference signal generating vegand wire train 7b, and placed at an interval of 180 deg. to each other with regard to the center shaft of the cylinder. When the grip 1 is held and pressed in the inserting direction, the rotor 3 rotates, and the vegand wire 7 allows detecting coils 21, 22 to generated a voltage.

Description

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

(Prior Art) In order to generate and read key code signals without a power source, a key using a magnetic material with a special structure called Wiegand wire has been proposed (Japanese Patent Laid-Open No. 55-1558
No. 79).

Wiegand wire is a type of alloy that is specially treated to make the core soft magnetic and the surface hard magnetic. According to such a Wiegand wire, the magnetization direction of the core portion can be changed by an external magnetic field, and by matching or reversing the magnetization direction of the core portion and the magnetization direction of the surface portion, the Wiegand wire can be changed. It is possible to make a large change in the generated magnetic flux. By causing such a change to occur rapidly, that is, by the switching action of the magnetic flux, a relatively large voltage can be induced in the detection coil.

(Problem to be Solved by the Invention) In order to read a key code equipped with this Wiegand wire, the Wiegand wire is embedded in a resin card or a non-magnetic key, and a pair of magnets and a detection coil are placed between them. The key code is read by inserting the key into a key hole, which has a problem in that the key design is specified and it is difficult to imagine it as a new key.

(Means and Effects for Solving the Problems) In order to achieve this object, the present invention provides a V-Gand which increases or decreases the magnetic flux generated by changing the direction of magnetizing force as the polarity of an external magnetic field changes. In a magnetically sensitive key in which a plurality of Wiegand wires are arranged and magnetic flux changes sequentially generated by the plurality of Wiegand wires can be detected as a key code, the Wiegand wires are arranged along the cylindrical surface of a cylindrical rotating body. The rotary body is arranged to extend in the axial direction of the rotary body, and the rotary body is rotatable relative to the grip for holding the key.

With this configuration, the key code can be generated or read by rotating the rotating body relative to the detection unit.

Therefore, a new type of small and convenient rotary key, which symbolizes the use of new materials, has been realized and its marketability has improved.Also, since it rotates by itself when inserted into the key hole, it is different from the conventional card type. The key code can be read in the same way.

(Embodiments of the Invention) The present invention will be described in detail below with reference to the accompanying drawings. Note that the same reference numerals in each figure indicate similar objects.

FIG. 1 shows a magnetically sensitive key according to an embodiment of the invention. According to the drawing, this magnetically sensitive key has a grip (1
), a pivot shaft (2), and a rotating body (3) are the main components. 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)
The grip (1) has a block (4a) which serves as a lid on the opposite side of the key profile key (4b).

Screws (la) and (4c) are cut inside the block (4a) and the grip (1), respectively, so that they can be screwed together. Normally, the profile key (4) is stored by this threaded connection, but if the magnetically sensitive key of the present invention cannot be used due to some failure, the grip (1)
) The key (4) can be taken out to open and close the lock. 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 attached to the grip (+
) and a first portion (2a) having approximately the same diameter.

A second portion (2b) having a smaller diameter than this, and both portions (2a) and (2b) are hollow. A thread (2c) is cut on the inner surface of the end of the first part (2a), and a thread (lb) is cut on the inner surface of the small diameter end of the grip (1).
) are mutually screwed together. 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, respectively. It protrudes from the surfaces of (2a) and (2b).

As shown in FIG. 2, a spiral groove (6) is formed on the surface of the second portion (2b). In addition, in the second part, a hollow part for receiving a spring (10) to be described later and a hollow part for receiving an elastic member (5) are connected to a partition wall (2d).
separated by

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 It is positioned between the fan-shaped arcs sandwiched by two adjacent reference signal generation Wiegand wires (7b). Therefore, if the key code Wiegand wire (7a) exists between the fan-shaped arcs sandwiched by the two adjacent reference signal Wiegand wires (7b), logic "1" is displayed, and if it does not exist, logic "1" is displayed. can display "0". 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, at the end of the reference signal generation Wiegand wire (7b), two trees of Wiegand wires (7C) for start bits are arranged at shorter intervals than the others to form a start bit indicating the starting point of the signal. exist.

A guide pin (8) is added to the open end side of the rotating body (3) and projects 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 a thrust washer (10a)
A compression spring (10) is also provided. The other end of this spring (10) is attached to the second portion (2b) of the pivot shaft (2).
) into the hollow. Further, a protrusion (5b
) is formed with a fitting groove (11) for fitting.

In this way, by interposing the spring (10) 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 detection 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) are placed 180 degrees apart from each other. Furthermore, the detection modules (21) and (22) each include two magnets and one detection coil (21a) and (22a). Such detection modules (21), (22
), first, the first magnet orients the magnetization of the core, that is, the soft magnetic part, and the hard magnetic part 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 VWG wire is changed. switch suddenly. Thus, the detection coil (21a
), (22a) can generate relatively large voltage pulses.

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) is rotated by the bearing (IB). Since the guide pin (8) of the rotating body (3) is supported in contact with the pivot shaft (2), Whirling groove (6)
The rotating body (3) therefore rotates. When this rotation is completed, the elastic member (5) of the pivot shaft (2)
It can be seen that the protrusion (5b) has fitted into the fitting groove (11) and the key operation has been completed. The next key operation will cause the protrusion (
By pressing 5a), the fitting groove (11) and protrusion (5b)
The fitting is released, and the rotating body (3) becomes the state shown in FIG. 1 due to the action of the compression spring (lO). As can be understood from the following, the rotation speed of the rotating body (3) is determined by the spiral groove (6).
), but in this embodiment, one key operation moves the rotating body (3) over the entire stroke, and the rotating body (3) rotates once at this time.

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.

Detection coil (2) of each detection module (21), (22)
Since the output voltages of 1a) and (22a) may contain external noise, they are processed by the noise discrimination circuit (3).
1) and (32) to remove these noises. In addition, 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, convert them into pulse signals as shown in Figure 6. Shape. Here, the outputs of the respective waveform amplification and shaping circuits (33) and (34) are as shown in FIGS. 6(a) and (b), for example. Among these output signals, the pulse signal generated by the reference signal generating V-Gand wire (7b) is generated by the wind pulse generating circuit (35).
It is converted into a rectangular pulse as shown in Figure (C). The wind pulse generation circuit (35) that forms this rectangular pulse can be constructed by M+ combinations such as an inverter activated by a start bit pulse and a multi-by-break.

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 (76). 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) is activated via the output circuit (38). Activate the opening/closing body (if(
) (Figure 4). If they do not match, the output circuit (38) 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 (16) 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. This rotation causes the key code Wiegand wire (7a) and the reference signal generation Wiegand wire (
7b) are detection modules (21) and (22), respectively.
passing near each module (21).

Voltages corresponding to FIGS. 6(a) and (b) are generated in the detection coils (21a) and (22a) of (22), respectively. As a result, the operation of the actuator (38) is determined as explained in the above-mentioned control circuit, and if the key codes match, locking or unlocking of the opening/closing body is executed, or if they do not match, it is not executed.

In the above embodiments, the rotation of the rotating body is promoted by a mechanical structure, but an electric stage such as a motor may also be used. Further, although two types of VEGAND wires are provided, one for generating a key code and the other for generating a reference signal, it is also possible to use only one type of wire. The angle seen from the central axis of the rotating body at which the VEGAND wires are distributed can be 90 degrees or more as in this embodiment, or 90 degrees or less.

(Effects of the Invention) According to the present invention, by arranging the VEGAND wires on the surface of the cylindrical rotating body as described above, no power supply is required to generate and read the key code signal, and a new type of A rotary magnetically sensitive key having a simple and compact configuration can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a magnetically sensitive key according to an embodiment of the present invention, FIGS. FIG. 5 is an explanatory diagram of the main part of the detection system of the magnetically sensitive key according to the embodiment of the invention, FIG. 5 is a timing chart showing output waveforms of each part in FIG. 5. FIG. In the drawing, (1) is the grip, (2) is the pivot shaft, (
3) Rotating body, (4) profile key, (5) elastic member, (6) spiral groove, (7) Vegan wire,
(8) is a guide pin.

Claims (5)

[Claims] (1) Arrange multiple 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 detect the changes in magnetic flux sequentially generated by the multiple Wiegand wires as a key code. In the magnetically sensitive key, the Wiegand wires are arranged so as to extend along the cylindrical surface of a cylindrical rotating body in the axial direction of the rotating body, and the rotating body has a key. A magnetically sensitive key characterized by being rotatable relative to a grip for use. (2) In the key according to claim 1, the rotating body is hollow and includes a guide pin extending inward from the cylindrical surface in a radial direction, and the grip supports the rotating body and A pivot shaft having a helical groove for guiding the guide pin on its surface is provided, and by pressing the grip in the direction of the rotation axis of the rotating body, the guide pin of the rotating body is guided through the helical groove of the pivot shaft. A magnetically sensitive key characterized in that the rotating body is guided along the pivot axis and rotates the rotating body with respect to the pivot shaft. (3) A magnetically sensitive key according to claim 1, wherein the rotating body is rotated by a motor. (4) The key according to any one of claims 1 to 3, wherein the rotating body includes a key code Wiegand wire array and a reference signal Wiegand wire array. Magnetic sensitive key. (5) A magnetically sensitive key according to any one of claims 1 to 4, wherein the grip has a housing portion for a profile key.