JPH11324438A - Lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a distance in which communication with a transponder is possible without increasing consumption power of a leader. SOLUTION: A lock cylinder 10 is supported and fixed on an attaching panel face P while the idling ring 21 holds a coil 2c wound around the periphery of a lock cylinder 20. In this case, a part thereof is cut to fill an insulator 21a such as a curing resin and formed so as not to become an annular conductive body. Thereby as the result where the occurrence of an induction magnetic field ϕ' canceling a magnetic flux ϕ which a coil 2c generates is suppressed, a distance for communication with a transponder 1 can be increased without increasing consumption power of a leader.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device suitable for use in a security system for managing the unlocking and locking of doors, lockers, and valuables storages of condominiums and other buildings, for example.

[0002]

2. Description of the Related Art In recent years, various systems have been developed which enable various information management by identifying attributes of data carriers in a non-contact manner. FIG. 2 is a block diagram showing the basic configuration of such a system. In this figure, reference numeral 1 denotes a transponder functioning as a data carrier, comprising components 1a to 1a.
1d. An antenna 1a generates an induced electromotive force that is electromagnetically induced in response to a high-frequency signal supplied from the outside, and supplies a modulation signal (clock) superimposed on the high-frequency signal to the next stage. 1b rectifies the induced electromotive force excited by the antenna 1a to obtain a predetermined driving voltage (± DC).
Is a rectifier circuit that generates Such a transponder 1 is actually carried and used, for example, as a key for unlocking an electric lock. Therefore, the key is configured to obtain electric energy necessary for operating internally by a high-frequency signal supplied from the outside.

Reference numeral 1c denotes a control circuit comprising a CPU, a ROM and a RAM, which demodulates the modulation signal (clock) and interprets and executes the contents of a command transmitted from the reader 2 described later. That is, various ID data stored in advance in the memory unit 1c is read in accordance with the interpreted command content, and the response is transmitted from the coil antenna 1a as PSK-modulated response data. The memory unit 1c uses an electrically rewritable nonvolatile memory such as an EEPROM or a flash memory.
The ID data can be rewritten in response to a request from the reader 2.

The reader 2 comprises a transmitting circuit 2a, a receiving circuit 2b
And an antenna 2c. The transmission circuit 2a
A command signal supplied from a controller 3 to be described later is FSK-modulated and transmitted from the antenna 2c as a high-frequency signal of a predetermined frequency. This high-frequency signal is a signal for driving the transponder 1 as described above,
Moreover, the modulated signal superimposed on this is a command for requesting the transponder 1 to transmit various IDs.
The receiving circuit 2b receives the response data transmitted from the transponder 1 and outputs it to the subsequent controller 3.

The controller 3 includes an interface circuit 3
a, a control circuit 3b and a demodulation circuit 3c.
The control circuit 3b includes a CPU, a ROM, a RAM, and the like, and performs serial data communication with a host system (not shown) via the interface circuit 3a. That is, in response to a request from the host system, the command transmission is instructed to the reader 2 side, and the response data demodulated by the demodulation circuit 3c is supplied to the host system side. For example, an electric lock is installed on the upper system side, and the attribute of the transponder 1 is identified. If the result matches, the electric lock is opened.

[0006] In such a system, the attribute of the transponder 1 can be instantaneously identified in a non-contact manner, and therefore, compared to a system using a magnetic card or a bar code as a data carrier.
Processing operations required for attribute identification are quickened, and convenience and confidentiality are improved. In addition, various restrictions (for example, time restrictions, restrictions by humans, and frequency restrictions (can be used only once) for the transponder 1 (key))
Etc.) can be easily performed and the history of unlocking can be managed, which is convenient. As shown in FIG. 3, the applicant of the present application incorporated the reader 2 into a coin locker and incorporated the transponder 1 into a key for unlocking and locking the lock of the coin locker as shown in FIG. Of the security system that manages the unlocking and locking of lockers. It should be noted that this type of invention is described in, for example, Japanese Patent Application No. 8-2, filed earlier by the present applicant.
No. 84648. Further, the present invention is not limited to the coin locker, but also proposes an invention in which an electronic lock is installed on a door of an apartment or other building, for example, and the system is applied thereto. According to this, there is an excellent feature that it is easy to finely regulate and manage the access of people.

[0007]

By the way, in the security system disclosed in the prior application, when the reader 2 is built in a coin locker, in order to avoid breakage or theft, the reader 2 is mounted separately from the locker lock. It is more desirable to adopt a structure that integrates both. Therefore, assuming a structure in which the reader 2 is integrated with the lock of the locker, as shown in FIG. 4, a coil is wound around the lock cylinder 10a to form a solenoid, which is connected to the above-described antenna 2c (see FIG. 2). ) Is conceivable.

However, in the case of such an integrated structure, the size of the antenna 2c is inevitably reduced.
The magnetic flux φ is reduced due to the reduction of the solenoid cross-sectional area. Therefore, the antenna 2c is used to reduce the communicable distance with the transponder 1 or to compensate for the reduced magnetic flux φ.
However, there is a problem that power consumption increases when the oscillating current supplied to the power supply is increased. Further, as a recent tendency, when this security system is applied to, for example, a door of a condominium or other building (with an electronic lock), there is a demand for downsizing. Therefore, the size of the antenna 2c must be reduced, and sufficient electric energy cannot be applied to the transponder 1 (key) according to the conventional thinking. The inventor of the present invention has achieved the principle of the invention in which excellent effects can be obtained with a simple configuration, as described later, as a result of trial and error after repeated studies and experiments in response to a request for downsizing of the lock device. .

Accordingly, the present invention has been made in view of such circumstances, and it is possible to improve the communication distance with the transponder 1 without increasing the power consumption of the reader 2 in response to a demand for miniaturization. It is intended to provide a locking device.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, the lock cylinder is mounted while holding the coil wound around the lock cylinder. In a lock device comprising an annular member supported and fixed on a surface, the annular member is formed so as not to be an annular conductor.

In a preferred embodiment, a part of the annular member is cut, and the cut part is filled with an insulator or the annular member is cut, as in the inventions according to the second to fourth aspects of the present invention. In addition to being formed of an insulator, the coil is molded into an insulating annular member to be integrally formed.

According to the present invention, the coil is formed by holding the coil wound around the lock cylinder and forming the annular member for supporting and fixing the lock cylinder on the mounting surface so as not to be an annular conductor. Suppresses the generation of the induced magnetic field φ ′ that cancels out the generated magnetic flux φ, thereby making it possible to improve the communication distance with the transponder 1 without increasing the power consumption of the reader 2.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the principle of the present invention will be described first, and then a lock device according to an embodiment will be described with reference to the drawings. (1) Principle of the Invention As described above, in the structure in which the reader 2 is integrated with the lock device 10 (see FIG. 4), a coil is wound around the lock cylinder 10a to form a solenoid. Is used as the antenna 2c (see FIG. 2).
Normally, the lock device 10 is configured such that the lock cylinder 10a is
It is often assembled on the mounting panel surface by b. The idling ring 10b is a lock cylinder 10
In order to prevent forced pulling out and strong rotation of a, it is an annular member whose side surface is machined in a tapered shape, and is made of hardened stainless steel or brass. The idle ring 10b also has a function such as a washer and a stopper for the lock cylinder 10a.

Therefore, the idle ring 10b can be regarded as an annular conductor, and is mounted in a state very close to the antenna 2c wound around the lock cylinder 10a. It was experimentally found that the element acts as a “secondary coil”. That is, as shown in FIG.
When an upward magnetic flux φ is generated from the antenna 2c coaxially with a, an induced electromotive current is excited in the idling ring 10b, which is an annular conductor, and an induced magnetic field in a direction to cancel the magnetic flux φ generated by the antenna 2c accordingly. As a result of the occurrence of φ ′, it becomes a factor of reducing the communicable distance with the transponder 1. Therefore, even if the oscillating current supplied to the antenna 2c is increased to compensate for the decrease in the generated magnetic flux φ, the induced magnetic field φ 'in the direction of canceling the magnetic flux φ increases with the increase. The dilemma is that the communication distance does not improve despite the increase. Therefore, in the present invention, based on such knowledge, a part of the idle ring 10b acting as a “secondary coil” is cut,
The cut portion is filled with an insulator such as a hardened resin to form an annular conductor so as not to form an annular conductor, thereby preventing generation of an induced magnetic field φ '. In the process of reaching the principle of the present invention, the inventor repeated many experiments such as increasing the number of turns of the antenna 2c, and made various contrivances. Although it was not obtained, it was found that there was an excellent effect by finding that a part of the idling ring 10b was cut. According to this, the effect is achieved that the power consumption is not increased and the communication distance is improved.

(2) Structure Next, the structure of the lock device according to the present invention will be described with reference to FIG. In this figure, reference numeral 20 denotes a lock cylinder which is unlocked and locked by a key KEY containing the above-mentioned transponder 1. 21 is the lock panel 20 for the lock cylinder 20
An idling ring supported and fixed on the upper part, and a part thereof is cut so as to be filled with an insulator 21a such as a hardened resin so as not to become an annular conductor. The idle ring 21
If the whole is made of non-conductor (insulator), of course,
It is not necessary to cut a part of the ring so as to fill the insulator 21a. A bobbin 22 is included in the idling ring 21 while being fitted into the lock cylinder 20, and is formed of a resin material such as Duracon. A coil functioning as the above-described antenna 2c is wound around the bobbin 22.
Reference numeral 23 denotes a nut for fastening and fixing the lock cylinder 20 in which the bobbin 22 and the idling ring 21 are combined to the mounting panel P.

According to such a structure, the lock cylinder 20
The magnetic flux φ in the normal direction of the mounting panel P is
Even if it is generated by an antenna 2c formed of a coil wound around 2, the idle ring 21 is filled with the insulator 21a and does not become an annular conductor, so that an induced magnetic field φ 'for canceling the magnetic flux φ is generated. Therefore, it is possible to improve the communication distance with the transponder 1 without increasing the power consumption of the reader 2. In addition, since the communicable distance with the transponder 1 is improved, read / write errors with respect to the transponder 1 are drastically reduced.

In the structure described above, the lock cylinder 20
Has been described as being supported and fixed by the idling ring 21. However, when the lock cylinder 20 is assembled to the mounting panel P using a washer or a washer instead of the idling ring 21, the insulation is also performed similarly to the idling ring 21. Either a structure in which a ring conductor is not formed by interposing a body, or a structure formed of an insulator itself is used. In short, the member for supporting and fixing the lock cylinder on the surface of the mounting panel P may have a structure that does not act as the “secondary coil” of the antenna 2c.

In the structure described above, the lock cylinder 20
Ring and the bobbin 22 around which the antenna coil is wound are separated from each other, but instead, the antenna coil is molded into the idle ring 21 to be integrally formed. It is good. However, when formed in such a manner, it is necessary to use a sufficiently strong insulator (for example, ceramic) as a material of the idling ring 21 so as to suppress forced pulling out and strong rotation of the lock cylinder 20. It should be noted that a part of the idle ring may be cut at one place or at a plurality of places. At least, a configuration that does not become an annular conductor may be used. The cutting gap is
For example, the interval may be extremely small, such as one hair, and it is possible to improve the appearance in terms of design by preventing the cut portion from being seen by human eyes in actual processing. In addition, the application field of the present invention is not limited to a security system that manages the unlocking and locking of lockers and valuables storages, etc., when an electric lock is installed on a door of an apartment or other building, or other locks. It can be widely applied to devices.

[0019]

According to the present invention, while holding the coil wound around the lock cylinder, the annular member for supporting and fixing the lock cylinder on the mounting surface is formed so as not to be an annular conductor. Therefore, it is possible to suppress the generation of the induced magnetic field φ ′ that cancels out the magnetic flux φ generated by the coil. As a result, communication with the transponder 1 can be performed without increasing the power consumption of the reader 2 while responding to the demand for downsizing the lock device. The possible distance can be improved.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view showing the structure of a lock device according to the present invention.

FIG. 2 is a diagram for explaining a conventional example.

FIG. 3 is a diagram for explaining a conventional example.

FIG. 4 is a diagram for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transponder (key) 2 Reader 2c Antenna 20 Lock cylinder 21 Idling ring 21a Insulator 22 Bobbin

Claims (4)

[Claims] 1. A lock device comprising: a lock cylinder; and an annular member that supports and fixes the lock cylinder on a mounting surface while holding a coil wound around the lock cylinder. Is formed so as not to be an annular conductor. 2. The lock device according to claim 1, wherein a part of the annular member is cut, and the cut part is filled with an insulator. 3. The lock device according to claim 1, wherein said annular member is formed of an insulator. 4. The lock device according to claim 1, wherein the coil is molded integrally with an insulating annular member.