JP2000076563A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the regular function from being spoiled under the influence of an external magnet by magnetically shielding electronic components from the external magnet. SOLUTION: On the reverse surface side of a buzzer 21, a shield plate 51 is arranged and this shield plate 51 is constituted by stacking a magnetic shield member which reduces the influence of magnetism and a nonmagnetic member which is electrically insulated. For the magnetic shield member, a magnetic material, such as Fe(iron or pure iron) and Cu(copper), which has magnetic permeability is available and for the nonmagnetic member, insulating substance of a nonmagnetic material of nonmetal, such as PVC(polyvinyl chloride), PC (polycarbonate), and PET(polyethylene terephthalate) is available. This shield member 51 is provided to greatly reduce the influence of the external magnet on the buzzer 21 and then malfunction, e.g. a stop of sounding is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a product which is attached to a displayed product via a cord or by affixing to prevent theft of the product, and outputs an alarm when theft occurs to detect theft. The present invention relates to an electronic device such as a self-sounding security tag for notifying the occurrence of a malfunction, and in particular, is designed to prevent the occurrence of a malfunction (for example, the stop of the sounding in the case of a self-sounding security tag) due to the influence of an external magnet or the like. About what you did.

[0002]

2. Description of the Related Art Electronic components, for example, self-sounding security tags,
The outline is as follows. First, there is a case, in which a battery, a buzzer, a CPU, and the like are housed. And it is attached to arbitrary goods via a cord or by sticking. In that state, for example,
If you try to steal the product by removing the self-sounding security tag from the product, or if you try to steal the product with the self-sounding security tag attached, the switch inside the case The CPU functions according to an operation or an alarm command signal output from a separately provided gate,
The buzzer sounds. Thus, the occurrence of the theft is announced.

[0003]

According to the above-described conventional configuration, there is a problem that the buzzer malfunctions due to the influence of the external magnet caused by the external magnet. For example, if a person who wants to steal a product attempts to steal the product with the permanent magnet close to the self-sounding security tag, the alarm issuance command signal output from the gate normally,
Although the buzzer sounds under the control of the CPU, the buzzer may not sound due to the magnetic force from the permanent magnet. In other words, the diaphragm, which is housed inside the buzzer and outputs sound by vibrating, is kept energized by the permanent magnet by the external magnetism of the permanent magnet,
In this case, the sound cannot be output. In this case, the original function could not be achieved, and an improvement was required. This is not limited to self-sounding security tags,
In addition to being common to various electronic devices, as an electronic component that loses its function, an electronic component (for example, an LC oscillator) including a coil or an inductor element in addition to a buzzer is also assumed.

The present invention has been made based on such a point, and an object of the present invention is to provide an electronic device capable of preventing a normal function from being impaired by an external magnet. is there.

[0005]

According to a first aspect of the present invention, there is provided an electronic apparatus comprising: a portable main body case; a main body case accommodated and arranged in the case; An electronic component and a shield structure for magnetically shielding the electronic component from an external magnet are provided. An electronic device according to a second aspect is the electronic device according to the first aspect, wherein the electronic device is a self-sounding security tag configured to generate an alarm using the electronic component. It is assumed that. The electronic device according to claim 3 is
3. The electronic device according to claim 2, wherein the electronic component is a buzzer having a magnetic vibrator, and the shield structure shields at least the buzzer from an external magnet. . Claim 4
The electronic device according to claim 3, wherein the electronic device according to claim 3,
The buzzer is arranged so that the vibrating body of the buzzer approaches the case side where the buzzer is arranged, and the shield structure is a shield plate, and the case on the side where the buzzer is arranged. The buzzer is interposed between the buzzers. or,
An electronic device according to a fifth aspect is the electronic device according to the second aspect, wherein the self-sounding security tag controls generation of an alarm using a CPU, and the electronic component includes the CP.
An LC oscillator for supplying an operating clock to U, wherein the shield structure shields at least the LC oscillator from an external magnet. According to a sixth aspect of the present invention, in the electronic device according to any one of the first to fifth aspects, the shield structure is electrically insulated from a magnetic shield member for reducing the influence of magnetism. The magnetic shield member is formed by laminating magnetic members, and the magnetic shield member is disposed on a surface facing the inside of the case. An electronic device according to a seventh aspect is the electronic device according to any one of the first to sixth aspects, wherein the case formed of a non-magnetic material, an antenna unit for transmitting and receiving signals to and from the outside, And the above-mentioned shield structure configured so as not to shield the antenna unit.

That is, in the case of the present invention, a shield structure is provided in an electronic device, and the electronic component which is housed and arranged in a case by the shield structure and which may malfunction due to the influence of a magnetic field is provided. Electronic components that are magnetically shielded from external magnets that are usually stronger than the magnetic field in the natural world, so that they are portable and can be affected by magnets. Can be prevented from malfunctioning. Various types of electronic devices can be considered. For example, a self-sounding security tag can be considered. In this case, an external magnet of a buzzer built in a case of the self-sounding security tag is used. The resulting malfunction can be prevented. At this time, as the shield structure, it is conceivable to shield at least the buzzer from the external magnet, but there are various structures such as a structure for shielding other electronic components, a structure for shielding all electronic components, and the like. Various configurations are conceivable. Further, as a specific structure of the shield structure, for example, it is conceivable that the shield structure is configured as a shield plate. In this case, the shield structure can be easily incorporated into an electronic device. In addition, by shielding the LC oscillator caused by the operation of the CPU, which is an electronic component affected by the external magnet, it is possible to prevent the LC oscillation circuit from malfunctioning due to the external magnet and stopping the CPU. Becomes In addition, the shield structure is composed of a magnetic shield member that weakens the effect of magnetism and a non-magnetic member that is electrically insulated. The member can ensure the clearance between the magnetic shield member and the buzzer, thereby reducing the influence of the external magnet on the buzzer diaphragm. In addition, since the non-magnetic member is an insulating material, it is possible to avoid unnecessary contact between the magnetic shield member and the CPU and its peripheral circuits in the self-sounding security tag, for example, and to prevent a short circuit. In addition, by forming the case from a non-magnetic material and configuring the shield structure so as not to shield at least the antenna unit for transmitting and receiving signals to and from the outside, it is possible to shield the external magnet without lowering the transmission and reception sensitivity of the antenna unit. Becomes possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment,
It shows an example in which the present invention is applied to a self-sounding security tag. First, there is a case 1 formed of a non-metallic non-magnetic material such as ABS resin. In this case 1, a cord 3 for attaching a self-sounding security tag to an arbitrary product (not shown) is detachably attached. Have been. One end of the cord body 3 is
As shown in FIG. 4, it is attached and fixed to the case 1,
The other end is detachably attached to the case 1.

That is, the other end of the cord body 3 has a lock pin 5
Are connected to each other, and an insertion hole 7 through which the lock pin 5 is inserted and withdrawn is formed on the case 1 side. or,
A lock member 9 is attached to the case 1 at a position below the insertion hole 7 so as to be rotatable about a shaft member 11. The lock member 9 is a coil spring 1
3 and the coil spring 33 constantly rotate and bias in the counterclockwise direction in FIG. When the lock pin 5 is inserted into the insertion hole 7, the lock pin 5
The engaging portion 9a of the lock member 9 is engaged with the engaging portion 5a at the tip of the lock member 9, thereby preventing the lock pin 5 from coming out of the insertion hole 7.

In this state, the lock pin 5 is inserted into the insertion hole 7.
Even if the lock member 9 is to be pulled out from the inside, since the lock member 9 is constantly urged in the counterclockwise direction in FIG. 4 by the coil springs 13 and 33, the engagement portion 5a at the tip of the lock pin 5 and the lock member 9 The configuration is such that the engagement relationship with the engagement portion 9a is not inadvertently released and does not easily come off.

In the case 1, a board 15 is accommodated and arranged. As shown in FIG. 2, a battery 17 and an alarm issuing switch 23 are mounted on the surface of the board 15, and FIG. As shown, on the back surface of the substrate 15, a CPU 19 and an LC oscillator 20 formed by a coil element and a capacitor element for supplying an operation clock to the CPU 19 are mounted. A buzzer 21 is provided at a lower position of the substrate 15 in FIG. The alarm issuing switch 23 is related to the cord 3 already described, and is activated when the cord 3 is cut off, and the CPU 19 is activated.
, The buzzer 21 is sounded to output an alarm.

As shown in FIG. 4, an antenna 25 is accommodated in the case 1 at a position above the substrate 15 in FIG.
Are located. That is, a transmitter (not shown) is provided, for example, as a “gate” at an entrance or an exit of a room in which products are displayed. If you attempt to steal the self-sounding security tag while it is still attached to the product, you will pass through the entrance or exit,
The transmitted wave output from the gate is transmitted to the antenna 2
After receiving the message 5, the CPU 19 functions to sound the buzzer 21 to notify the occurrence of a theft case. still,
The above-mentioned antenna 25 is provided with a release unit 35 (for releasing the locked state of the cord 3 of the self-sounding security tag, shown in FIG. 4) in addition to receiving the signal from the gate.
And also receives signals from Therefore, when a shield plate 51 which will be described later, which is a shield structure portion, is not disposed on the peripheral surface of the antenna 25, there is no possibility that the transmission and reception sensitivity is reduced by the shield plate 51.

On the left side of the substrate 15 in FIG. 4, a slide member 31 is accommodated and arranged so as to be slidable in the vertical direction in FIG. The slide member 31 is constantly urged downward by a coil spring 33 provided inside the case 1. Also, in the lower part of the case 1 in FIG.
Insertion holes 41 and 43 into which the pair of release pins 37 and 39 of the releaser 35 are inserted are formed. When the pair of release pins 37 and 39 of the releaser 35 are inserted into the insertion holes 41 and 43, the slide member 31
Is moved upward against the urging force of By the movement of the slide member 31, the front end of the slide member 31 comes into contact with and presses the other end of the lock member 9 already described.
Thereby, the lock member 9 rotates clockwise in FIG. 4 against the urging force of the coil spring 13. By the rotation of the lock member 9, the engagement relationship between the engagement portion 5 a at the tip of the lock pin 5 and the engagement portion 9 a of the lock member 9 is released. That is, the lock pin 5 can be pulled out from the insertion hole 7.

The pair of release pins 3 of the release unit 35
Only the release pin 37 inserted into the insertion hole 41 actually exerts the release function among 7, 39. In order to make the releaser 35 have a so-called “reversible” configuration,
A pair of release pins 37 and 39 are provided. That is, the direction of the release device 35 is reversed, and the release pin 39 is released.
Is inserted into the insertion hole 41, the desired operation can be realized.

In the case 1, the slide member 3
A release operation start detection switch 45 is arranged on the upper side of the device 1. First, a first terminal member 45a is formed on the slide member 31 side. A second terminal member 45b is attached to the substrate 15 side. Then, a pair of release pins 37, 39 of the releaser 35 are inserted into the insertion holes 41, 43.
In a normal state where the slide member 31 is not inserted into the
Is urged downward by the coil spring 33, so that the first terminal member 45a and the second terminal member 45b are separated from each other.

On the other hand, when the releaser 35 is inserted, the slide member 31
Is moved upward against the urging force of the first terminal member 45a, the first terminal member 45a is also moved by the movement of the slide member 31,
As a result, the first terminal member 45a and the second terminal member 45b come into contact. The slide member 31 is electrically connected to the first terminal member 45a attached to the substrate 15 via a coil spring 33. Therefore, it is detected that the normal release is started by the contact between the first terminal member 45a and the second terminal member 45b.

The release operation start detection switch 45 will be further described. Normally, when a normal release operation is performed using the normal release device 35, an alarm release signal is output from the release device 35 side. Even if the release operation start detection switch 45 operates, no alarm is output. On the other hand, if an unauthorized release operation is attempted using a release jig imitating a regular release device 35, the alarm release signal is not output, so that the release operation start detection switch 45 activates the alarm. Is output.

The release operation start detection switch 45
At the timing at which the lock member 5 operates, the slide member 31 has not yet sufficiently risen, so that the engagement relationship between the engagement portion 5a at the tip of the lock pin 5 and the engagement portion 9a of the lock member 9 is released. Has not been reached. That is, an alarm is output before the locked state is released by an unauthorized release operation, and the alarm is not detected.

The relationship between the components described above and the CPU 19 is shown in the control block diagram of FIG. The CPU 19 includes an alarm issuing switch 23 and a release operation start detecting switch 4.
5. The buzzer 21 is appropriately sounded based on various external signals received via the antenna 25. The LC oscillator 20 includes a coil element and a capacitor element, and supplies an operation clock to the CPU 19.

In the self-sounding security tag having the above-described structure, a shield plate 51 is disposed on the lower surface side of the buzzer 21 as shown in FIGS. The shield plate 51 is formed by laminating a magnetic shield member that reduces the influence of magnetism and a non-magnetic member that is electrically insulated. As the magnetic shield member, a magnetic material having high magnetic permeability such as Fe (iron or pure iron) and Cu (copper) is effective. As the non-magnetic member, PVC (polyvinyl chloride),
Non-metallic non-magnetic insulating materials such as PC (polycarbonate) and PET (polyethylene terephthalate) are effective. By providing such a shield plate 51, the influence of the external magnet on the buzzer 21 is greatly reduced, thereby preventing a malfunction such as a stop of the sounding.

The shield plate 51 has substantially the same shape as the buzzer 21, as shown in FIG.
Further, as shown in FIG. 9, a configuration is adopted in which the PVC plate 53 and the Fe plate 55 are bonded, and the thickness t1 of the PVC plate 53 is
Is 0.3 mm, the thickness t2 of the Fe plate 55 is 0.1 mm, and the total thickness is 0.4 mm. Also, shield plate 5
1 is disposed on the side of the buzzer 21 where the diaphragm is disposed.

Now, as shown in FIG. 10, if the permanent magnet 100 emitting magnetic field lines such as the magnetic field lines 101 from the outside is brought close to the self-sounding security tag having the above configuration, the shield plate 51 has a high magnetic permeability. Fe plate 55 as a magnetic material
The magnetic field lines of the permanent magnet 100 are absorbed and pass through the inside of the Fe plate 55 like the magnetic field lines 103 by the effect of
Lines of magnetic force are emitted from the side surfaces of. Fe plate 55
Although the magnetic field line distribution that may affect the diaphragm 21a is changed, the Fe plate 55, which is a magnetic material, is magnetized and may absorb the diaphragm 21a. A fixed clearance is provided between the Fe plate 55 and the buzzer 21 with the PVC plate 53, which is a substance, interposed therebetween to separate the magnetic field line distribution of the permanent magnet and
a is further reduced. Further, since the non-magnetic member is an insulating material like the PVC plate 53, unnecessary contact between the circuit in the self-sounding security tag and the Fe plate 55 can be avoided to prevent short circuit. FIG. 10 is a cross-sectional view of the self-sounding security tag.
It is a figure showing the state where approached. In FIG. 10, reference numeral 21b denotes an iron core, and a coil (not shown) is wound around the outer periphery of the iron core 21b. In addition, iron core 21
A magnet 21c is arranged on the outer peripheral side of b with a gap.

As described above, according to the present embodiment, the following effects can be obtained. First, by providing the shield plate 51, the influence of the external magnet on the buzzer 21 is greatly reduced, and the malfunction of the buzzer 21, for example, the occurrence of a situation such as a stop of the sound when the sound should be sounded is prevented. can do. Therefore,
The reliability as a self-sounding security tag can be greatly improved. Further, since the shield plate 51 is provided on the side where the diaphragm is disposed with respect to the buzzer 21, it is possible to reliably suppress the influence of the external magnet on the diaphragm.
Therefore, the above effect is higher. Further, since only one shield plate 51 is provided, it can be easily applied to existing ones.

The present invention is not limited to the above embodiment. First, in the one embodiment,
Although the shield plate 51 is arranged so as to shield only the buzzer 21 portion, it may be formed and arranged so as to shield the entire self-sounding security tag, that is, all electronic components. In addition, the influence of the external magnet on the LC oscillator 20 and the CPU 19 accompanying the LC oscillator 20 can be considered. Therefore, it is conceivable to arrange a shield for the LC oscillator 20 and the CPU 19. Thus, it is possible to prevent the coil, particularly the LC oscillator 20 for supplying the operation clock to the CPU 19, from malfunctioning due to the external magnet or from stopping the CPU 19 due to the malfunction of the LC oscillator 20. Becomes As a specific arrangement configuration, the CPU 15
9. When the LC oscillator 20 is mounted, a shield plate 52 that can cover the CPU 19, the LC oscillator 20 and the buzzer 21 as shown in FIG. CPU 19, LC oscillator 20, shield plate 52 (PVC plate 53, Fe plate 5
5), the case 1 is configured to be overlapped in order. The laminated configuration of the shield plate 52 is the same as that of the shield plate 51. Thereby, the influence of magnetism on the CPU 19 and the LC oscillator 20 from the outside is reduced. The CPU of the shield plate 52
By arranging the PVC plate 53 on the side of the LC oscillator 19 and the LC oscillator 20, unnecessary contact between the Fe plate 55 and the CPU 19, the LC oscillator 20 and its peripheral circuits can be avoided, and short circuit can be prevented. Further, in the above-described embodiment, the self-sounding security tag is described as an example of the electronic device.
Other various electronic devices that are likely to be affected by the external magnet can be similarly applied. or,
The above-mentioned materials for the shield structure are merely examples, and the materials are not limited thereto. Further, the configuration of the shield structure may be directly formed on the case 1 by vapor deposition or the like, for example. Further, the case 1 is formed of a non-magnetic material, and the shield plate 51 is configured so as not to shield at least the antenna 25 that transmits and receives signals to and from the outside. It is possible to do. In addition, coils that are easily affected by magnetism,
An electronic component such as an inductor may be appropriately magnetically shielded.

[0024]

As described in detail above, according to the electronic device of the present invention, a shield structure is provided in the electronic device,
By the shield structure, an electronic component that is housed and arranged in the case and may malfunction due to the influence of the magnetic field,
Since the shield is shielded from the external magnet, it is possible to prevent the electronic component from malfunctioning due to the influence of the external magnet. Also, when applied to a self-sounding security tag, a malfunction caused by an external magnet of a buzzer built in the case of the self-sounding security tag, that is, stopping the sounding when the sound should be sounded, It is possible to prevent the occurrence of a malfunction such as an error. In addition, by shielding the LC oscillator caused by the operation of the CPU, which is an electronic component affected by the external magnet, it is possible to prevent the LC oscillation circuit from malfunctioning due to the external magnet and stopping the CPU. Becomes In addition, the shield structure is composed of a magnetic shield member that weakens the effect of magnetism and a non-magnetic member that is electrically insulated. The member can ensure the clearance between the magnetic shield member and the buzzer, thereby reducing the effect of the external magnet on the buzzer diaphragm. In addition, since the non-magnetic member is an insulating material, it is possible to avoid unnecessary contact between the magnetic shield member and the CPU and its peripheral circuits in the self-sounding security tag, for example, and to prevent a short circuit. or,
By forming the case from a non-magnetic material and configuring the shield structure so as not to shield at least the part to the antenna that transmits and receives signals to and from the outside, it is possible to shield the external magnet without lowering the transmission and reception sensitivity of the antenna part. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a plan view showing an appearance of a self-sounding security tag.

FIG. 2 is a view showing an embodiment of the present invention, and is a plan view showing a configuration on a front side of a substrate on which various electronic components are mounted inside a case of a self-sounding security tag.

FIG. 3 is a view showing one embodiment of the present invention, and is a plan view showing a configuration on a back surface side of a substrate mounted in a case of a self-sounding security tag and mounted with various electronic components.

FIG. 4 is a view showing an embodiment of the present invention, and is a cross-sectional view showing a structure inside a case of a self-sounding security tag.

FIG. 5 is a diagram illustrating an embodiment of the present invention, and is a block diagram illustrating a configuration for control.

FIG. 6 is a view showing one embodiment of the present invention, and is a plan view showing a state in which a substrate is removed in a case of a self-sounding security tag;

FIG. 7 is a view showing one embodiment of the present invention, and is a side view showing a state where a shield plate and a buzzer are incorporated in a case of a self-sounding security tag.

FIG. 8 is a view showing an embodiment of the present invention, and is a plan view of a shield plate.

FIG. 9 is a view showing one embodiment of the present invention, and is a side view of a shield plate.

FIG. 10 is a diagram illustrating an embodiment of the present invention, and is a diagram for describing an operation and an effect.

FIG. 11 is a view showing another embodiment of the present invention, and is a plan view of a shield plate.

[Explanation of symbols]

 1 case 19 CPU 21 buzzer 21a diaphragm 21b iron core 21c magnet 25 antenna 51 shield plate 53 PVC plate (non-magnetic material) 55 Fe plate (magnetic shield member) 100 permanent magnet

Claims (7)

[Claims] 1. A portable main body case, an electronic component housed and arranged in the case, which is likely to malfunction due to the influence of a magnetic field, and a shield structure for magnetically shielding the electronic component from an external magnet. An electronic device comprising: 2. The electronic device according to claim 1, wherein the electronic device is a self-sounding security tag configured to generate an alarm using the electronic component. 3. The electronic device according to claim 2, wherein the electronic component is a buzzer having a magnetic vibrator, and the shield structure shields at least the buzzer from an external magnet. And electronic equipment. 4. The electronic device according to claim 3, wherein the buzzer is arranged so that a vibrating body of the buzzer approaches the case side where the buzzer is arranged, and the shield structure is a shield plate. An electronic device, wherein the electronic device is inserted between the case on which the buzzer is disposed and the buzzer. 5. The electronic device according to claim 2, wherein the self-sounding security tag controls generation of an alarm using a CPU, and the electronic component supplies an operation clock to the CPU. An electronic device, comprising: an oscillator, wherein the shield structure shields at least the LC oscillator from an external magnet. 6. The electronic device according to claim 1, wherein the shield structure comprises a magnetic shield member for reducing the influence of magnetism and a non-magnetic member which is electrically insulated. An electronic device, wherein the magnetic shield member is disposed on a surface facing an inner side of the case. 7. The electronic device according to claim 1, wherein the case is formed of a non-magnetic material, an antenna for transmitting and receiving signals to and from the outside, and at least the antenna is not shielded. An electronic device, comprising: the above-described shield structure configured as described above.