JPH0719501B2 - Magnetically sensitive key device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensitive key device for generating a key code by an electromagnetic method, and more particularly to a magnetic sensitive key device using a vegan wire.

(Prior Art) In order to generate or read a key code signal with a simple configuration without using a power source such as a battery, a key using a magnetic material with a special structure called a vegan wire has been proposed ( JP-A-55-155879).

The vegan wire has a core portion made of soft magnetic material and a surface portion made of hard magnetic material by subjecting a certain alloy to a special treatment. According to such a vegan wire, the magnetization direction of the core portion can be changed by an external magnetic field, and the magnetization direction of the core portion and the magnetization direction of the surface portion can be made to coincide with each other or opposite to each other, whereby the vegan wire is A large change can be given to the magnetic flux passing through.
By making such a change abruptly, a relatively large voltage can be induced in the detection coil.

(Problems to be solved by the invention) However, when the key embedded with such a vegan wire is inserted into the key hole provided with the detection unit on the code reading side, the key must be moved at a constant speed in order to read the key code correctly. I had to send it at. Therefore, a constant-speed feed mechanism must be provided on the reading side, which causes a problem that the system itself becomes complicated and expensive.

(Means and Actions for Solving Problems) In order to achieve this object, according to the present invention, a vegan wire that changes the magnetic flux generated by changing the magnetization direction according to the change in the polarity of the external magnetic field. A plurality of keys, a pair of magnets for forcing a change in the magnetization direction of each vegan wire of the key, a detection module including a detection coil arranged in the middle, and a position of the vegan wire with respect to the detection module. A magnetic sensitive key device comprising a control circuit for determining whether or not a key code of the key matches a key code stored in advance based on a detection signal generated by a change and instructing unlocking and locking, The vegan wire array comprises two kinds of wire array for key code and wire array for reference signal. The key pulse wire row and the reference signal wire row are arranged in correspondence with each other, and the control circuit forms a window pulse based on a detection signal from the reference signal wire row. The key code is formed according to the presence / absence of the output of the key code wire when the wind pulse is generated.

With such a configuration, the pulse width of the reference signal changes according to the key insertion speed, and the presence of the key code can be confirmed by this reference signal.

Embodiments of the Invention Embodiments of the present invention will be described below with reference to the accompanying drawings.
In addition, in each figure, the same reference numerals denote the same objects.

FIG. 1 shows a magnetic sensitive key of a magnetic sensitive key device according to an embodiment of the present invention. According to the drawings, the magnetic sensitive key has a grip (1), a pivot (2), and a rotating body (3) as main components. The grip (1) is a part for holding a key and has a substantially cylindrical shape. The inside of this grip (1) is hollow, and for example, as shown in this embodiment, an emergency profile key (4).
(Conventional mechanical key) can be stored. The profile key (4) has a block (4a) which is to be a lid of the grip (1) in a portion opposite to the key profile (4b). Screws (1a) and (4c) are respectively cut inside the block (4a) and the grip (1) so that they can be screwed together. Normally, due to this screwing, the profile key (4) is housed, but if the magnetically sensitive key of the present invention cannot be used due to some trouble, remove the key (4) from the grip (1). You can open and close the key. Besides the grip (1),
It can be used as a part that combines a radio, a clock, and a writer.

The pivot shaft (2) is a substantially cylindrical member for supporting and guiding the rotating body (3). The pivot shaft (2) has a first portion (2a) having substantially the same diameter as the grip (1) and a second portion (2b) having a smaller diameter than the grip (1). (2b) is also hollow. A screw (2c) is cut on the inner surface of the end of the first portion (2a), and is screwed with the screw (1b) cut on the surface of the small diameter end of the grip (1). That is, both surfaces of the grip (1) and the pivot shaft (2) are flush with each other.
An elastic member (5) bent in a U shape is inserted into the first portion (2a) and the second portion (2b), and the large and small projections (5
a) and (5b) are projected from the surface of each part (2a) and (2b). A spiral groove (6) is formed on the surface of the second portion (2b) as shown in FIG. Also, the second
In part (2), a hollow part for receiving a spring (10) described later and a hollow part for receiving the elastic member (5) are separated by a partition wall (2d).

The rotator (3) has a cylindrical shape with one closed and the other open, and a vegan wire (7) arranged along its surface and extending in the axial direction is embedded. According to this embodiment, as shown in FIG. 3, a vegan wire (7)
Is a vegan wire for key codes arranged corresponding to the key code signal to be generated (7a) and a vegan wire for generating reference signals arranged at equal intervals to generate a reference signal for reading the key code. With rows (7b). Wiegand wire row for key code (7a)
And the reference signal generating vegan wire (7b) are arranged 180 degrees apart from each other with respect to the central axis of the cylinder, and the key code vegan wire (7a) is adjacent to each other.
Place the two reference signal generating vegan wires (7b) between the fan-shaped arcs. Therefore, if the key code vegan wire (7a) exists between the fan-shaped arcs sandwiched by the two adjacent reference signal generating vegan wires (7b), a logic "1" is displayed and the existence If not, a logic "0" can be displayed. In addition, in order to make the key code difficult to read, a general soft magnetic wire having no vegan wire effect may be provided for the logic "0". Further, since the start bit indicating the starting point of the signal is formed at the end of the reference signal generating vegand wire (7b), two start bit vegand wires (7c) arranged at intervals shorter than the other are formed. Exists.

On the open end side of the rotating body (3), there is provided a guide pin (8) protruding radially inward from the cylindrical surface. An engagement pin (9) extending in the axial direction is formed inside the closed end of the rotating body (3), and a compression spring (10) is provided together with the thrust washer (10a). The other end of the spring (10) is inserted into the hollow of the second portion (2b) of the pivot shaft (2). Also, the guide pin (8) of the rotating body (3)
A fitting groove (11) for fitting the projection (5b) is formed further on the open end side than the point where the above is provided. According to the embodiment of the present invention, the spring (10) is interposed and the guide pin (8) of the rotating body (3) is engaged with the spiral groove (8) of the pivot shaft (2). Complete a magnetically sensitive key.

Fig. 4 shows the opening and closing body (1
6) shows a key code detection device provided on a door (for example, a door). According to the figure, a key hole (17) of an opening / closing body (16) that receives the rotating body (3) of the magnetic sensitive key, is arranged at the bottom of this key hole (17) to promote rotation of the rotating body (3). To detect the magnetic flux change of the bearing (18) and the vegan wire for the key code (7a) and the magnetic flux change of the vegan wire for the reference signal generation (7b), respectively. Detection module (21), (2
2) equipped. The bearing (18) has a center portion whose shape is complementary to the shape of the tip portion of the rotating body (3) so that the rotating body (3) of the key can be contacted and supported. There is. Each detection module (21), (22)
Are 180 degrees apart from each other. The detection modules (21) and (22) each include two magnets and one detection coil. Such a detection module (2
According to 1) and (22), first, the first magnet directs the magnetizations of the core portion, that is, the soft magnetic portion and the surface hard magnetic portion in the same direction. Then, the first magnet and a second magnet having a different polarity approach each other, but the strength of the second magnet overcomes the interaction of the magnetic field between the shell and the core, and the core magnetic property of the vegan wire is obtained. To switch suddenly. Thus, a relatively large voltage pulse can be generated in the detection coils (21a), (22a).

According to the above configuration, by inserting the key into the key hole (17) and pressing the grip (1) in the key inserting direction, the tip of the rotating body (3) can be rotated by the bearing (18). Being abutted and supported, the guide pin (8) of the rotating body (3) advances along the spiral groove (6) of the pivot shaft (2), so that the rotating body (3) rotates. At the stage where this rotation is completed, the protrusion (5b) of the elastic member (5) of the pivot shaft (2)
It can be understood that the key has been fitted by fitting into the fitting groove (11). In the next key operation, by pushing the protrusion (5a), the fitting between the fitting groove (11) and the protrusion (5b) is released, and by the action of the compression spring (10), the rotating body (3) is moved to the position shown in FIG. It becomes the state of. As can be understood from the above, the rotating body (3)
The number of revolutions is determined by the pitch and stroke of the spiral groove (6), but in this embodiment, the entire stroke rotating body (3) is moved by one key operation, and at this time, the rotating body (3) makes one rotation. It is configured to do.

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

The detection coil (21) of each detection module (21), (22)
Since the output voltages of a) and (22a) may contain external noise, noise discrimination circuits (31) and (32), respectively.
To remove these noises. In addition, the detection coil (21
Since the waveforms of the generated voltage are dull due to the inductance of a) and (22a) themselves, they are shaped into pulse signals as shown in FIG. 6 by the waveform amplification and shaping circuits (33) and (34), respectively. Here, the outputs of the waveform amplification and shaping circuits (33) and (34) are as shown in FIGS. 6 (a) and 6 (b), for example.
Of this output signal, the pulse signal generated by the reference signal generating vegan wire (7b) is the wind pulse generating circuit (3
By 5), it is converted into a rectangular pulse as shown in FIG. 6 (c). This rectangular pulse can be configured by a combination of an inverter and a multivibrator activated by a start bit pulse.

The key code determination circuit (36) includes an output pulse from the window pulse generation circuit (35) and a waveform amplification and shaping circuit (3) generated by the key code vegan wire (7a).
The key code pulse (Fig. 6 (d)) is obtained by taking the AND logic with the output pulse of 3). After that, 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 operated via the output circuit (38). Then, the opening / closing body (16) (Fig. 4) is locked or unlocked. If they do not match, the output circuit (38) is not activated.

Next, the operation of this embodiment will be described.

When the magnetically sensitive key shown in FIG. 1 is inserted into the key hole (17) of the opening / closing body (16) and the grip (1) is pressed in the inserting direction, the rotating body (3) is indicated by the arrow A in FIG. Rotate to. By this rotation, the vegan wire for generating the key code (7a) and the vegan wire for generating the reference signal (7b) pass near the detection modules (21) and (22), respectively, and the respective modules (21) and (22). Voltages corresponding to FIGS. 6 (a) and 6 (b) are generated in the detection coils (21a) and (22a) of FIG. As a result, the operation of the actuator (39) is determined as described in the control circuit, and the lock / unlock of the opening / closing member is executed when the key codes match, or not executed when they do not match.

In this case, it will be seen that the reference signal for detecting the key code is always valid, since the pulse width of the window pulse will change correspondingly even if the key insertion speed changes. That is, the reading of the key code is not mistaken due to the difference in the key insertion speed.

In the above embodiments, the rotation of the rotating body is promoted by the mechanical structure, but an electric means such as a motor may be used. The angle viewed from the central axis of the rotating body in which the vegan wire is distributed can be 90 degrees or more as in this embodiment, or 90 degrees or less.

(Effect of the Invention) According to the present invention, by providing two types of key codes and a reference signal for the vegan wire arranged in the key as described above, the key code can be reliably read regardless of the key operation speed. It is possible to obtain a magnetically sensitive key device having a simple and compact structure that is highly reliable. Further, according to the magnetically sensitive key device of the present invention, power supply is not required for generating and reading the key code signal.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a magnetic sensitive key which is a main part of a magnetic sensitive key device according to an embodiment of the present invention, FIGS. 2 and 3.
FIG. 4 is an explanatory view of essential parts of a magnetically sensitive key according to an embodiment of the present invention, FIG. 4 is an explanatory view of essential parts of a detection system of a magnetically sensitive key device according to an embodiment of the present invention, and FIG. 6 is a timing chart showing an output waveform of each part of FIG. 5, and FIG. 6 is another main part explanatory view of the detection system of the magnetic sensitive key device according to the embodiment of FIG. In the drawings, (1) is a grip, (2) is a pivot,
(3) is a rotating body, (4) is a profile key, (5) is an elastic member, (6) is a spiral groove, (7) is a vegan wire, (7a) is a key cord wire row, and (7b) is Reference signal wire row, (8) is a guide pin.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-97678 (JP, A) JP-A-55-155878 (JP, A) Jitsuko 51-18658 (JP, Y1)

Claims (9)

[Claims] 1. A key having a plurality of vegan wires arranged to increase or decrease the magnetic flux generated by changing the magnetization direction according to the polarity change of an external magnetic field, and a change in the magnetization direction of each vegan wire of the key is forced. A pair of magnets, a detection module including a detection coil disposed in the middle thereof, a key code of the key and a key stored in advance based on a detection signal generated by a position change of the vegan wire with respect to the detection module. In a magnetically sensitive key device having a control circuit for determining whether or not a code matches and instructing opening and locking, the arrayed vegan wire is a key code wire array and a reference signal wire array. There are two types, and the detection module is arranged corresponding to each of the key code wire row and the reference signal wire row. Is placed, and again
The control circuit includes a window pulse generation circuit that forms a window pulse based on a detection signal from the reference signal wire train, and a key code is formed depending on whether or not the key code wire is output when the window pulse is generated. Characteristic magnetic sensitive key device. 2. The device according to claim 1, wherein the vegan wire is arranged so as to extend along the cylindrical surface of the cylindrical rotating body in the axial direction of the rotating body. And a magnetic sensitive key device. 3. The magnetic sensitive key device according to claim 2, wherein the rotating body is rotatable with respect to a grip for holding the key. 4. The apparatus according to claim 2, wherein each wire of the wire row for the key code of the vegan wire is approximately 180 degrees as seen by two adjacent wires of the wire row for the reference signal. A magnetically sensitive key device characterized in that it is located on a fan-shaped arc that is separated. 5. The magnetically sensitive key device according to claim 1, wherein the reference signal wire row includes a start bit wire at an end thereof. 6. The device according to claim 5, wherein the start bit wire is composed of two vegan wires arranged at intervals shorter than the other wires. Key device. 7. The apparatus according to claim 3, wherein the rotating body is hollow and includes a guide pin extending radially inward from the cylindrical surface, and the grip supports the rotating body. And a pivot shaft having a spiral groove for guiding the guide pin on its surface, and pressing the grip in the direction of the rotary shaft of the rotary member causes the guide pin of the rotary member to move to the pivot shaft of the rotary shaft. A magnetically sensitive key device, characterized in that it is guided along a spiral groove to rotate the rotating body with respect to the pivot shaft. 8. A magnetically sensitive key device according to claim 2, wherein the rotating body is rotated by a motor. 9. The magnetic sensitive key device according to claim 3, wherein the grip has a storage portion for a profile key.