JPH0611091U - Anti-theft device and alarm unit for anti-theft device - Google Patents

Abstract

(57) [Summary] [Purpose] Used in a theft prevention device and a theft prevention device that can prevent the theft of articles even when the alarm unit is downsized and attached to a wall by a simple method. To provide an anti-theft alarm unit. [Arrangement] The alarm unit 1 includes a housing 2 attached to a fixed portion, and C that receives outside light when the housing 2 is peeled off.
It is provided with dS14 and terminals 4 and 5. RS flip
The flop 16 outputs a latch signal when the terminals 4 and 5 are not electrically connected to each other or when the CdS 14 receives external light and has a low resistance value. In response to this latch signal, the buzzer 20 produces an alarm sound. The magnetic sensitive switch 28 is attached in the vicinity of the permanent magnet piece attached to the anti-theft article. Magnetic sensitive switch 28
Are connected to the terminals 4 and 5 by connection lines 31 and 32.
When the article is stolen, the buzzer 20 emits an alarm sound not only when the magnetic sensitive switch 28 is detached or the connection lines 31 and 32 are disconnected or detached, but also when the alarm unit 1 is detached from the fixed portion. Occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anti-theft device for preventing an exhibit, an exhibit, an article such as a painting from accidents such as theft or loss, and an alarm unit for the anti-theft device used in the anti-theft device.

[0002]

[Prior art]

 A conventional antitheft device is generally composed of a detection unit for detecting the time of theft of an antitheft object and an alarm unit for issuing an alarm in response to a detection signal from the detection unit. Then, as the detection part, for example, an electrical connection wire which is locked to the article in a loop shape and whose both ends are connected to two input terminals of the alarm unit has been used.

According to this conventional anti-theft device, the alarm unit does not generate an alarm because the two input terminals are electrically connected to each other during normal operation when the product is not stolen, and the product is stolen. At times, since the connection line is disconnected or disconnected from the input terminal, an alarm is generated from the alarm unit, which prevents the article from being stolen.

[0004]

[Problems to be solved by the device]

 In the conventional anti-theft device, when the alarm unit is configured to be too large for a thief or a thief to carry, or installed in a wall or the like so that the thief cannot remove it. Indicates that the above-mentioned intended function is exerted. However, in consideration of cost reduction and ease of installation of the alarm unit, when the alarm unit is downsized and attached to a wall by a simple method such as double-sided tape or screwing, the thief may The alarm unit may be removed from a wall or the like and taken away with the article without disconnecting the connection line or removing the input terminal from the input terminal. There was a drawback that it was not exhibited at all and theft of the article could not be prevented.

The present invention has been made in view of the above circumstances, and is capable of reliably preventing theft of articles even when the alarm unit is downsized and attached to a wall or the like by a simple method. And an anti-theft alarm unit used in the anti-theft device.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, an alarm unit for an anti-theft device according to a first aspect of the present invention detects a housing attached to a desired location and an abnormal state provided in the housing and given to the housing. Abnormality detecting means, a first electrical connection portion and a second electrical connection portion provided on the housing, and the first electrical connection portion and the second electrical connection portion. Latching means provided to the housing when a non-conducting state is substantially non-conducting or when an abnormality detecting signal is obtained from the abnormality detecting means, and in response to the latching signal. An alarm unit is provided for generating an alarm and provided in the housing.

The abnormality detecting means includes a light receiving element that receives external light when the housing is removed from the desired location, a vibration detecting means that detects vibration of the housing, and a posture of the housing. It is possible to use a posture detecting means or the like.

An alarm unit for an anti-theft device according to a second aspect of the present invention is the alarm unit for an anti-theft device according to the first aspect, and, in a normal state, the first electrical connection portion and the second The second electrical connection portion and the first electrical connection portion in a substantially non-conductive state when the article targeted for theft prevention is stolen. And a theft detection means for doing so.

The theft detection means is, for example, a permanent magnet piece attached to an article that is an anti-theft object, is mounted near the permanent magnet piece, and has the first electrical connection portion and the second electrical connection. Magnetic sensitive switch electrically connected between the magnetic sensitive switch and the magnetically connecting portion. Further, as the theft detection means, the actuator is attached to the anti-theft object in a pressed state, and an electrical connection is made between the first electrical connection portion and the second electrical connection portion. A microswitch connected to can also be used. Furthermore, as the theft detection means, a conductor that locks in a loop shape on the article to be protected from theft and electrically connects the first electrical connection portion and the second electrical connection portion, It can also be used.

The antitheft device according to the third aspect of the present invention is configured to include a first alarm unit and a second alarm unit. The first alarm unit is a first casing attached to a desired location, and a first abnormality detecting means provided in the first casing and detecting an abnormal state given to the first casing. And a first electrical connection portion and a second electrical connection portion provided on the first housing, and between the first electrical connection portion and the second electrical connection portion. And a first circuit portion provided in the first housing, and a detection signal that outputs a detection signal when the current flowing in the first circuit portion becomes a predetermined value or less. And a first latch signal is generated when a detection signal is obtained from the first current detection means or when an abnormality detection signal is obtained from the first abnormality detection means. First latch means provided in the first housing, and an alarm is issued in response to the first latch signal. Comprising a first alarm means provided in the first housing, a. The second alarm unit includes a second casing attached to a desired location, and a second abnormality detecting means provided in the second casing for detecting an abnormal state given to the second casing. Between the third electrical connection portion and the fourth electrical connection portion provided on the second housing, and between the third electrical connection portion and the fourth electrical connection portion. A second circuit portion formed and provided on the second housing, and provided on the second housing by outputting a detection signal when the current flowing through the second circuit portion becomes a predetermined value or less. A second current detecting means and a second latch signal when a detection signal is obtained from the second current detecting means or when an abnormality detecting signal is obtained from the second abnormality detecting means. A second latch means provided in the second housing and an alarm before the second latch signal is generated in response to the second latch signal. Comprising a second alarm hand stage provided in the second housing, the. The antitheft device according to the third aspect further includes a first connection line that electrically connects the first electrical connection part and the third electrical connection part, the second connection line, and the second connection line. And a second connection line that electrically connects the electrical connection part of the second electrical connection part and the fourth electrical connection part. The first circuit section and the second circuit section are arranged so that a current flows through a closed circuit formed by the first circuit section, the first connection line, the second circuit section, and the second connection line. A battery is included in one of the circuit parts. Further, the first alarm unit has a first interruption means for substantially interrupting the current flowing through the closed circuit when the first latch signal is obtained. Furthermore, the second alarm unit has a second interruption means for substantially interrupting the current flowing through the closed circuit when the second latch signal is obtained.

The first abnormality detecting means includes a light receiving element that receives external light when the first housing is removed from the desired location, and a vibration detecting element that detects vibration of the first housing. It is possible to use motion detecting means, attitude detecting means for detecting the attitude of the first housing, or the like.

Further, as the second abnormality detecting means, a light receiving element that receives external light when the second housing is removed from the desired location, and a vibration of the second housing are detected. It is possible to use a vibration detecting means for detecting the movement, a posture detecting means for detecting the posture of the second housing, or the like.

[0013]

[Action]

 According to the anti-theft device of the second aspect, when the article is stolen, the theft detection means causes substantially no electrical connection between the first electrical connection portion and the second electrical connection portion. Since the state is set, an alarm is issued from the alarm means of the alarm unit, and the theft of the article is prevented as in the above-mentioned conventional antitheft device. Then, when an abnormality occurs in the housing of the alarm unit due to the removal of the alarm unit, the abnormal state is detected by the abnormality detecting means, and the alarm means issues an alarm. Therefore, even when the alarm unit is downsized and attached to a wall or the like by a simple method, it is possible to reliably prevent the article from being stolen.

According to the anti-theft device of the third aspect, the first alarm unit is attached to the anti-theft object, and the second alarm unit is fixed near the object such as an exhibition stand or a wall. Attached (these locations may be reversed). When the first or second connection line is disconnected or disconnected when the article is stolen, the first alarm unit of the first alarm unit and the second alarm unit of the second alarm unit Both sides give an alarm. In addition, when either one of the first alarm unit and the second alarm unit is removed from the mounting location, the first housing of the first alarm unit or the second alarm unit of the second alarm unit is removed. When an abnormality occurs in the second housing, an alarm is issued from both the first alarm means of the first alarm unit and the second alarm means of the second alarm unit. Therefore, even when the first alarm unit and the second alarm unit are miniaturized and attached to a wall or the like by a simple method, it is possible to reliably prevent the theft of articles. Further, according to the antitheft device of the third aspect, as described above, the first alarm means of the first alarm unit and the second alarm means of the second alarm unit can be connected to each other. Since alarms are issued from both sides, if the first or the second connection line is disconnected or removed, as in the case of the conventional anti-theft device, only an alarm is issued from the fixed part such as a wall. Instead, an alarm will be issued from the item side, and there is an advantage that it is easy to catch a thief carrying the item.

[0015]

【Example】

 The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is an electric circuit diagram showing an anti-theft device according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a usage state of the anti-theft device.

In these drawings, 1 is an antitheft alarm unit. The alarm unit 1 has a structure in which the circuit components shown in FIG. 1 are incorporated in a housing 2 attached at a desired position. In this embodiment, the housing 2 is attached to the display stand 24 or the like by the double-sided adhesive tape 3 adhered to the bottom surface, as shown in FIG. At first, the housing 2 may be configured to be attached to the display stand 4 or the like by other means such as screwing. The housing 2 is provided with terminals 4, 5, 6, and 7 as electrical connection portions. One end of a resistor 8 is connected to the terminal 4, and the other end of the resistor 8 is connected to the positive electrode of a battery 10 such as a lithium battery via a magnetic sensitive switch 9 as a power switch. The magnetic sensitive switch 9 is opened only when the permanent magnet is brought close thereto, and is normally closed. The negative electrode of the battery 10 is connected to the terminal 7. A connection midpoint A between the resistor 8 and the magnetic sensitive switch 9 is connected to the collector of the transistor 12 via the resistor 11. The base of the transistor 12 is connected to the terminal 5, and its emitter is connected to the negative electrode of the battery 10. A resistor 13 is connected between the base and emitter of the transistor 12. A series circuit including a CdS 14 as a light receiving element and a resistor 15 is connected in parallel with the resistor 11. The CdS14 is an element whose resistance value is significantly reduced when receiving light, but various other light receiving elements may be used. A light receiving window (not shown) for introducing outside light is formed on the bottom surface of the housing 2, so that the light receiving window is not covered with the double-sided adhesive tape 3 as shown in FIG. Holes 3a are provided at appropriate positions on the double-sided adhesive tape 3. The CdS 14 is arranged so as to face the light receiving window. In this embodiment, CdS14 is an abnormality detecting means for detecting an abnormal state given to the housing 2. The midpoint of the connection between CdS14 and the resistor 15 is connected to the set input S of the RS flip-flop 16. A series circuit including a capacitor 17 and a resistor 18 is connected between the connection midpoint A and the negative electrode of the battery 10. The midpoint of the connection between the capacitor 17 and the resistor 18 is connected to the reset input R of the RS flip-flop 16. The output Q of the RS flip-flop 16 is connected to the input of a drive circuit 19 for driving the buzzer 20. The drive circuit 19 is adapted to drive the buzzer 20 when an H signal (high level signal) is input to its input portion, and at that time, an alarm sound is emitted from the buzzer 20. The RS flip-flop 16 is set when the H signal is input to the set input S, the H signal is obtained at the output Q, and the L signal (low level signal) is obtained at the inverted output Q bar. The RS flip-flop 16 is reset when the H signal is input to the reset input R, and the L signal is obtained at the output Q and the H signal is obtained at the inverted output Q bar. The output Q of the RS flip-flop 16 is connected to the base of the transistor 23 via the resistor 21. The collector of the transistor 23 is connected to the terminal 6. The transistor 23 allows a signal indicating that an alarm sound is being emitted from the buzzer 20 to be taken out from the terminals 6 and 7. By connecting the terminals 6 and 7 to a remote monitoring device (not shown), remote monitoring or the like becomes possible.

Further, in FIGS. 1 and 2, reference numeral 25 indicates that the terminal 4 and the terminal 5 are kept in a conductive state during normal operation, and that the terminal 26 and the terminal 5 are connected between the terminal 4 and terminal 5 when the article 26 as an antitheft object is stolen. Is an anti-theft detection unit that brings the device into a substantially non-conducting state. In this embodiment, the anti-theft detection unit 25 is attached to the permanent magnet piece 27 such as a flexible rubber magnet attached to the article 26, and is attached near the permanent magnet piece 27 and connected to the terminals 4 and 5. And a magnetically sensitive switch 28 connected via 31 and 32. In this embodiment, the permanent magnet piece 27 is attached to the article by the double-sided adhesive tape 29, and the magnetic sensitive switch 28 is attached on the permanent magnet piece 27 by the double-sided adhesive tape 30. The magnetic sensitive switch 28 is closed only when it is sensitive to magnetism and is opened when it is not sensitive to magnetism. As the double-sided adhesive tape 29, one having an adhesive force larger than that of the double-sided adhesive tape 30 is selected.

Next, the operation of the anti-theft device shown in FIGS. 1 and 2 having the above configuration will be described.

First, in use, as shown in FIG. 2, the alarm unit 1 is attached to the display stand 24, etc., and the permanent magnet piece 27 and the magnetic sensitive switch 28 are attached to the antitheft article 26. deep. In this state, the magnetic sensitive switch 28 is closed, and since the CdS 14 does not receive external light, its resistance value is large. Next, the permanent magnet (not shown) is separated from the magnetic sensitive switch 9 as the power switch, and the magnetic sensitive switch 9 is closed. From that moment, the H signal is input to the reset input R of the RS flip-flop 16 for a fixed time determined by the time constant of the capacitor 17 and the resistor 18, and the initialization is performed, and the output Q of the RS flip-flop 16 is held at the L signal. Therefore, no alarm sound is generated from the buzzer 20. In this state, since the magnetic sensitive switch 28 is closed, the transistor 12 is on, but the resistance value of CdS14 is large, so that the L signal is input to the set input of the RS flip-flop 16. ing. For convenience of explanation, this state is called a normal state.

Then, when the article 26 is stolen, if the magnetic sensitive switch 9 peels off the permanent magnet piece 27 or disconnects or disconnects the connection line 31 or 32, the gap between the terminal 4 and the terminal 5 is removed. Becomes non-conductive. Therefore, the transistor 12 is turned off, and the H signal is input to the set input S of the RS flip-flop 16. As a result, the H signal is latched at the output Q of the RS flip flop 16, and the buzzer 20 produces an alarm sound. On the other hand, in the above-mentioned normal state, the magnetic sensitive switch 9 was peeled off from the display stand 24 without the permanent magnet piece 27 being peeled off or the connection line 31 or 32 being broken or removed. At times, the CdS 14 receives external light, and its resistance value decreases. Therefore, even if the transistor 12 is turned on, the H signal is input to the set input S of the RS flip-flop 16 due to the voltage division ratio between the CdS 14 and the resistor 15. As a result, the H signal is latched at the output Q of the RS flip-flop 16, and the buzzer 20 produces an alarm sound.

As described above, according to the antitheft device shown in FIGS. 1 and 2, the magnetic sensitive switch 9 is peeled off from the permanent magnet piece 27, the connection line 31 or 32 is broken, or the outside. Not only when the alarm unit 1 is peeled off, but also when the alarm unit 1 is peeled off from the display stand 24, an alarm sound is emitted. Therefore, the alarm unit 1 can be made smaller and lighter and a simple method such as the double-sided adhesive tape described above. Thus, the article 26 can be reliably prevented from being stolen even when it is attached to the display stand 24 or the like.

FIG. 3 is an explanatory view showing a usage state of an anti-theft device according to another embodiment of the present invention. This embodiment differs from the embodiments shown in FIGS. 1 and 2 only in the structure of the anti-theft detection unit 25. In this embodiment, as shown in FIG. 3, the anti-theft detection unit 25 is attached to the anti-theft object 26 while the actuator 33a is being pressed, and is disposed between the terminals 4 and 5. It is composed of a micro switch 33 electrically connected to each other by connection lines 34 and 35. The micro switch 33 is attached by the double-sided adhesive tape 36, and a hole 36a for allowing the actuator 33a to project is provided at an appropriate position of the double-sided adhesive tape 36. . The micro switch 33 is configured to be closed when the actuator 33a is in a pressed state and open when the actuator 33a returns to the protruding state.

In the case of this anti-theft device as well, similar to the anti-theft device shown in FIGS. 1 and 2, the micro switch 33 was peeled from the article 26, and the connection line 34 or 35 was disconnected or removed. Not only in the case but also when the alarm unit 1 is peeled off from the display stand 24, the alarm sound is emitted, so the alarm unit 1 can be made smaller and lighter and the display stand can be manufactured by a simple method such as the double-sided adhesive tape. Even when attached to 24 or the like, the article 26 can be reliably prevented from being stolen.

FIG. 4 is an explanatory view showing a usage state of an anti-theft device according to still another embodiment of the present invention. This embodiment differs from the embodiment shown in FIGS. 1 and 2 only in the structure of the anti-theft detection unit 25. In this embodiment, as shown in FIG. 4, the antitheft detection unit 25 locks the antitheft object 26 in a loop shape to electrically connect the terminal 4 and the terminal 5. It is composed of a connecting wire 37 with a cover of a book.

In the case of this anti-theft device as well, similar to the anti-theft device shown in FIGS. 1 and 2, not only when the connection line 37 is disconnected or disconnected, but also when the alarm unit 1 is displayed on the display stand 24. Even if the alarm unit 1 is peeled off, the alarm sound is emitted. Therefore, even when the alarm unit 1 is reduced in size and weight and attached to the display stand 24 or the like by a simple method such as the above-mentioned double-sided adhesive tape, the article 26 can be securely attached. Theft can be prevented.

In each of the embodiments described above, the CdS 14 is used as the abnormality detecting means for detecting the abnormal state given to the housing 2 as described above, but other means is used as the abnormality detecting means. Can be used. For example, a vibration detector that detects the vibration of the housing 2 or a posture detector that detects the posture of the housing 2 (for example, a mercury switch that detects the inclination of the housing 2) can be used as the abnormality detecting means. Further, in each of the above embodiments, the buzzer 20 is used as the alarm means, but it is also possible to use other kinds of alarm devices.

FIG. 5 is an electric circuit diagram showing an anti-theft device according to an embodiment of the present invention, and FIG. 6 is an explanatory view showing a usage state of the anti-theft device.

In these drawings, 51 and 81 are alarm units, respectively. The alarm units 51 and 81 are configured such that the circuit parts shown in FIG. 5 are incorporated inside the casings 52 and 82 which are attached to desired locations. In this embodiment, as shown in FIG. 6, the housings 52 and 82 can be attached to the wall 44 or the painting 45 which is an anti-theft object by a double-sided adhesive tape 53 and 83 adhered to the bottom surface. ing . However, the housings 52 and 82 may be configured to be attached to the wall 44, the painting 45, or the like by other means such as screwing.

The housing 52 is provided with terminals 54, 55, 56 and 57 as electrical connection parts. One end of a resistor 58 is connected to the terminal 54, and the other end of the resistor 58 is connected to a positive electrode of a battery 60 such as a lithium battery via a magnetic sensitive switch 59 as a power switch. The magnetic sensitive switch 59 is opened only when the permanent magnet is brought close thereto, and is normally closed. The negative electrode of the battery 60 is connected to the terminal 57. The connection midpoint B between the resistor 58 and the magnetic sensitive switch 59 is connected to the collector of the transistor 62 via the resistor 61. The base of the transistor 62 is connected to the terminal 55 and its emitter is connected to the negative electrode of the battery 60. A resistor 63 is connected between the base and emitter of the transistor 62. In parallel with the resistor 61, a series circuit including a CdS 64 as a light receiving element and a resistor 65 is connected. The CdS 64 is an element whose resistance value is significantly reduced when receiving light, but other various light receiving elements may be used. A light receiving window (not shown) for introducing outside light is formed on the bottom surface of the housing 52, and the light receiving window is not covered with the double-sided adhesive tape 53 as shown in FIG. Thus, the holes 53a are provided at appropriate positions on the double-sided adhesive tape 53. The CdS 64 is arranged so as to face the light receiving window. In this embodiment, CdS 64 serves as an abnormality detecting means for detecting an abnormal state given to the housing 52. The midpoint of the connection between the CdS 64 and the resistor 65 is connected to the set input S of the RS flip-flop 66. A series circuit including a capacitor 67 and a resistor 68 is connected between the connection midpoint B and the negative electrode of the battery 60. The midpoint of the connection between the capacitor 67 and the resistor 68 is connected to the reset input R of the RS flip-flop 66. The output Q of the RS flip-flop 66 is connected to the input of a drive circuit 69 for driving the buzzer 70. The drive circuit 69 drives the buzzer 70 when an H signal is input to its input portion, and the buzzer 70 issues an alarm sound at that time. The RS flip-flop 66 is set when the H signal is input to the set input S, and the H signal is obtained at the output Q and the L signal is obtained at the inverted output Q bar. Further, the RS flip-flop 66 is reset when the H signal is inputted to the reset input R, and the L signal is obtained at the output Q and the H signal is obtained at the inverted output Q bar. The output Q of the RS flip-flop 66 is connected to the base of the transistor 23 and the base of the transistor 74 via resistors 71 and 72, respectively. The collector of the transistor 73 is connected to the terminal 56. The transistor 73 allows a signal indicating that the alarm sound is being emitted from the buzzer 70 to be taken out from the terminals 56 and 57 to the outside. By connecting the terminals 56 and 57 to a remote monitoring device (not shown) or the like, remote monitoring or the like becomes possible. The collector of the transistor 74 is connected to the terminal 54, and the emitter thereof is connected to the negative electrode of the battery 60.

The housing 82 is provided with terminals 84 and 85 as electrical connection portions. The base of a transistor 92 is connected to the terminal 84, and the collector of the transistor 92 is connected to the positive electrode of a battery 90 such as a lithium battery via a resistor 91 and a magnetic sensitive switch 89 as a power switch. The magnetic sensitive switch 89 is opened only when the permanent magnet is brought close to it, and is normally closed. The negative electrode of the battery 90 is connected to the terminal 85. In parallel with the resistor 91, a series circuit including a CdS 94 as a light receiving element and a resistor 95 is connected. The CdS94 is an element whose resistance value is significantly reduced when receiving light, but various other light receiving elements may be used. A light receiving window (not shown) for introducing outside light is formed on the bottom surface of the housing 82, so that the light receiving window is not covered with the double-sided adhesive tape 83 as shown in FIG. A hole 83a is provided at an appropriate position on the double-sided adhesive tape 83. The CdS 94 is arranged so as to face the light receiving window. In this embodiment, CdS94 serves as an abnormality detecting means for detecting an abnormal state given to the housing 82. The midpoint of the connection between the CdS 94 and the resistor 95 is connected to the set input S of the RS flip-flop 96. A series circuit including a capacitor 97 and a resistor 98 is connected between the connection midpoint between the resistor 91 and the magnetic sensitive switch 89 and the negative electrode of the battery 90. The midpoint of the connection between the capacitor 97 and the resistor 98 is connected to the reset input R of the RS flip-flop 96. The output Q of the RS flip-flop 96 is connected to the input of a drive circuit 99 for driving the buzzer 100. The drive circuit 99 drives the buzzer 100 when the H signal is input to its input portion, and the buzzer 100 issues an alarm sound at that time. The RS flip-flop 96 is set when the H signal is input to the set input S, and the H signal is obtained at the output Q and the L signal is obtained at the inverted output Q bar. Further, the RS flip-flop 96 is reset when the H signal is inputted to the reset input R, and the L signal is obtained at the output Q and the H signal is obtained at the inverted output Q bar. The base of the transistor 104 is connected to the inverted output Q bar of the RS flip-flop 96 via the resistor 101. The collector of the transistor 104 is connected to the emitter of the transistor 92. The emitter of the transistor 104 is connected to the negative electrode of the battery 90. A resistor 93 is connected between the base of the transistor 92 and the negative electrode of the battery 90.

Further, in FIGS. 1 and 2, 114 is a connection line connecting the terminals 54 and 84, and 115 is a connection line connecting the terminals 55 and 85.

In the present embodiment, the positive electrode of the battery 60 → the magnetic sensitive switch 59 → the resistor 58 → the terminal 54 → the connecting line 114 → the terminal 84 → the base / emitter of the transistor 92 → the collector / emitter of the transistor 104 → the terminal 85. -> Connection line 115-> terminal 55-> base-emitter of transistor 62-> negative electrode path of battery 60 forms a closed circuit. In the present embodiment, the transistor 62 serves as a current detection unit that outputs a detection signal (OFF in this example) when the current flowing through the closed circuit becomes a predetermined value or less. Further, in the present embodiment, the transistor 92 serves as a current detection unit that outputs a detection signal (OFF in this example) when the current flowing in the closed circuit becomes a predetermined value or less. Further, in the present embodiment, the transistor 74 constitutes a cutoff means for cutting off the current flowing through the closed circuit when the H signal which is the latch signal is obtained at the output Q of the RS flip-flop 66 which is the latch means. ing. Furthermore, in this embodiment, when the transistor 104 receives the H signal which is the latch signal at the output Q of the RS flip-flop 96 which is the latch means (when the L signal is obtained at the inverted output Q bar). ) Is provided with a shutoff means for shutting off the current flowing through the closed circuit.

Next, the operation of the anti-theft device shown in FIGS. 5 and 6 having the above structure will be described.

First, in use, as shown in FIG. 6, the alarm unit 51 is attached to the wall 44 or the like, and the alarm unit 81 is attached to the anti-theft painting 45 or the like. In this state, since the CdS 64 and 94 do not receive external light, their resistance values are large. Next, the permanent magnet (not shown) is separated from the magnetic sensitive switch 59 as a power switch, and the magnetic sensitive switch 59 is closed. From that moment, the H signal is input to the reset input R of the RS flip-flop 66 for a fixed time determined by the time constant of the capacitor 67 and the resistor 68 to initialize the output, and the output Q of the RS flip-flop 66 is the L signal. The alarm sound is not emitted from the buzzer 70. Similarly, a permanent magnet (not shown) is separated from the magnetic sensitive switch 89 as a power switch to close the magnetic sensitive switch 89. From that moment, the H signal is input to the reset input R of the RS flip-flop 96 for a certain period of time determined by the time constant of the capacitor 97 and the resistor 98 to initialize the output, and the output Q of the RS flip-flop 96 becomes the L signal. The buzzer 100 is held and no alarm sound is generated. In this state, since the transistor 74 is off and the transistor 104 is on, a current flows in the closed circuit, and as a result, the transistors 62 and 92 are on. Although the transistors 62 and 92 are turned on as described above, since the resistance values of the CdS 64 and 94 are large, the L signal is input to the set inputs of the RS flip-flops 66 and 96. For convenience of explanation, this state is called a normal state.

If the connection line 114 or 115 is broken or disconnected when the picture 45 or the like is stolen, no current flows in the closed circuit, so the transistors 62 and 92 are turned off. When the transistor 62 is turned off, the H signal is input to the set input S of the RS flip-flop 66, the H signal is latched at the output Q of the RS flip-flop 66, and the alarm sound is generated from the buzzer 70. Further, when the transistor 92 is turned off, the H signal is input to the set input S of the RS flip-flop 96, the H signal is latched to the output Q of the RS flip-flop 96, and the buzzer 100 also generates an alarm sound. To do. In this way, when the connection line 114 or 115 is broken or disconnected, the buzzers 70 and 100 simultaneously generate alarm sounds.

Further, in the above-mentioned normal state, when the alarm unit 51 is peeled off from the wall 44, the CdS 64 receives external light, and its resistance value becomes small. Therefore, even if the transistor 62 is turned on, the H signal is input to the set input S of the RS flip-flop 66 due to the voltage division ratio of the CdS 64 and the resistor 65. As a result, the H signal is latched at the output Q of the RS flip-flop 66, and the buzzer 70 produces an alarm sound. At the same time, since the H signal is latched at the output Q of the RS flip-flop 66, the transistor 74 is turned on, and as a result, the current flowing in the closed circuit is bypassed between the collector and the emitter of the transistor 74. It will be shut off. Therefore, not only the transistor 62 but also the transistor 92 is turned off, the H signal is input to the set input S of the RS flip-flop 96, the H signal is latched at the output Q of the RS flip-flop 96, and the buzzer 100 also outputs the signal. A warning sound is generated. Thus, even when the alarm unit 51 is peeled off from the wall 44, the buzzers 70 and 100 simultaneously generate alarm sounds.

Further, in the above-mentioned normal state, when the alarm unit 81 is peeled off from the painting 45, the CdS 94 receives external light and the resistance value thereof becomes small. Therefore, even if the transistor 92 is on, the H signal is input to the set input S of the RS flip-flop 96 due to the voltage division ratio of the CdS 94 and the resistor 95. As a result, the H signal is latched at the output Q of the RS flip-flop 96, and the buzzer 100 generates a warning sound. At the same time, the L signal is latched at the inverted output Q bar of the RS flip-flop 96, so that the transistor 104 is turned off, and as a result, the current flowing through the closed circuit is cut off. Therefore, not only the transistor 92 but also the transistor 62 is turned off, the H signal is input to the set input S of the RS flip-flop 66, the H signal is latched at the output Q of the RS flip-flop 66, and the buzzer 70 also A warning sound is generated. In this way, even when the alarm unit 81 is peeled off from the painting 45, the alarm sounds are simultaneously generated from the buzzers 70 and 100.

As described above, according to the anti-theft device shown in FIGS. 5 and 6, not only when the connection line 114 or 115 is disconnected or disconnected, but also in the alarm unit 51 and the alarm unit 81. Even if one of them is peeled off from the wall 44 or the painting 45, an alarm sound is emitted, so the alarm units 51 and 81 can be made smaller and lighter and the wall 44 or the painting 45 can be made by a simple method such as the double-sided adhesive tape. Even when the article 26 is attached to the same, it is possible to reliably prevent the article 26 from being stolen. Further, according to the anti-theft device shown in FIGS. 5 and 6, since the alarms are issued from both the alarm units 51 and 81, if the connection line 114 or 115 is disconnected or disconnected, the conventional Similar to the anti-theft device, the alarm is issued not only from the fixed part side (in this example, the wall 44 side) but also from the article side (in this example, the painting 45 side). There is also an advantage that it is easy to catch a thief carrying 45.

In the embodiment shown in FIGS. 5 and 6 described above, the CdS 64, 94 are used as the abnormality detecting means for detecting the abnormal state given to the housings 52, 82, as described above. Other means can be used as the abnormality detecting means. For example, as the abnormality detecting means, a vibration detector that detects the vibration of the casings 52 and 82, a posture detector that detects the posture of the casings 52 and 82 (for example, a mercury switch that detects the inclination of the casings 52 and 82), etc. Can be used.

[0041]

[Effect of device]

 According to the present invention, even if the alarm unit is downsized and attached to a wall or the like by a simple method, it is possible to reliably prevent the article from being stolen.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an anti-theft device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a usage state of the anti-theft device shown in FIG.

FIG. 3 is an explanatory view showing a usage state of an anti-theft device according to another embodiment of the present invention.

FIG. 4 is an explanatory view showing a usage state of an anti-theft device according to still another embodiment of the present invention.

FIG. 5 is an electric circuit diagram showing an anti-theft device according to still another embodiment of the present invention.

6 is an explanatory diagram showing a usage state of the anti-theft device shown in FIG.

[Explanation of symbols]

 1 Alarm Unit 2 Housing 4 Terminal 5 Terminal 12 Transistor 14 CdS 16 RS Flip Flop 20 Buzzer 25 Theft Detection Section 28 Magnetic Sensitive Switch 33 Micro Switch 37 Connection Line 51 Alarm Unit 52 Housing 54 Terminal 55 Terminal 60 Battery 62 Transistor 64 CdS 66 RS Flip Flop 70 Buzzer 74 Transistor 81 Alarm Unit 82 Housing 84 Terminal 85 Terminal 92 Transistor 94 CdS 96 RS Flip Flop 100 Buzzer 104 Transistor 114 Connection Line 115 Connection Line

Claims (15)

[Scope of utility model registration request] 1. A casing attached to a desired location, an abnormality detecting means provided in the casing for detecting an abnormal state given to the casing, a first electrical connection portion and a first electric connection portion provided in the casing. When the second electrical connection portion and the first electrical connection portion and the second electrical connection portion are substantially in a non-conducting state, or an abnormality detection signal is obtained from the abnormality detection means. The theft, which comprises a latching means provided on the housing for generating a latch signal when triggered, and an alarming means provided on the housing for issuing an alarm in response to the latching signal. Alarm unit for prevention device. 2. The alarm unit for an anti-theft device according to claim 1, wherein the abnormality detecting means comprises a light-receiving element that receives external light when the housing is removed from the desired location. 3. The abnormality detecting means is a vibration detecting means for detecting the vibration of the housing.
Alarm unit for the described anti-theft device. 4. The anomaly detecting means is an attitude detecting means for detecting an attitude of the housing.
Alarm unit for the described anti-theft device. 5. An alarm unit for an anti-theft device according to claim 1, wherein the first electrical connection portion and the second portion are connected in a normal state.
And an electrical connection between the first electrical connection portion and the second electrical connection portion when the article of the antitheft object is stolen. An anti-theft device, comprising: 6. The theft detection means is attached to a permanent magnet piece attached to an antitheft object, the permanent magnet piece is mounted in the vicinity of the permanent magnet piece, and the first electrical connection portion and the second electrical connection are provided. 6. The antitheft device according to claim 5, further comprising a magnetically sensitive switch electrically connected to the active connection portion. 7. The theft detection means is attached to an article that is an antitheft object while the actuator is being pressed, and is between the first electrical connection portion and the second electrical connection portion. The antitheft device according to claim 5, comprising a microswitch electrically connected. 8. The conduction wherein the theft detection means locks the article to be protected against theft in a loop shape and electrically connects the first electrical connection portion and the second electrical connection portion. The antitheft device according to claim 5, wherein the antitheft device comprises a body. 9. A first casing attached to a desired location, first abnormality detecting means provided in the first casing for detecting an abnormal state given to the first casing, and the first abnormality detector. A first electrical connection portion and a second electrical connection portion provided on the housing of the first electrical connection portion, and the first electrical connection portion and the second electrical connection portion formed between the first electrical connection portion and the second electrical connection portion. A first circuit portion provided in the housing, and a first current detecting means provided in the first housing for outputting a detection signal when the current flowing through the first circuit portion is below a predetermined value. And a first latch signal is generated when the detection signal is obtained from the first current detection means or when the abnormality detection signal is obtained from the first abnormality detection means, and the first latch signal is provided in the first housing. And a first latch means provided in the first housing for generating an alarm in response to the first latch signal. A first alarm unit including a first alarm means, a second housing attached to a desired location, and an abnormal state provided to the second housing and provided to the second housing. Second abnormality detecting means for detecting the above, a third electrical connection portion and a fourth electrical connection portion provided on the second housing, the third electrical connection portion and the fourth electrical connection portion. A second circuit portion formed between the electric connection portion and the second casing,
Second current detecting means provided in the second housing for outputting a detection signal when the current flowing through the second circuit portion becomes equal to or less than a predetermined value; and a detection signal from the second current detecting means. And a second latch means provided in the second housing for generating a second latch signal when the abnormality detection signal is obtained from the second abnormality detection means, and the second abnormality detection means. A second alarm unit which generates an alarm in response to the latch signal of the second housing and which is provided in the second housing, the first electrical connection portion and the third alarm unit. A first connection line for electrically connecting with an electrical connection section, and a second connection for electrically connecting between the second electrical connection section and the fourth electrical connection section And a line, the first circuit portion, the first connection line, the second circuit portion and the second connection line One of the first circuit portion and the second circuit portion includes a battery so that a current flows through a closed circuit formed by the first alarm unit, the first alarm unit, and the first latch signal. Has a first shutoff means for substantially shutting off the current flowing through the closed circuit, and the second alarm unit has the closed circuit when the second latch signal is obtained. An anti-theft device comprising: a second cutoff unit that substantially cuts off a current flowing therethrough. 10. The first abnormality detecting means comprises:
10. The anti-theft device according to claim 9, further comprising a light receiving element that receives external light when the housing is removed from the desired location. 11. The first abnormality detecting means comprises:
10. The anti-theft device according to claim 9, which is a vibration detecting means for detecting the vibration of the housing. 12. The first abnormality detecting means comprises:
10. The anti-theft device according to claim 9, wherein the anti-theft device is a posture detection unit that detects a posture of the housing. 13. The second abnormality detecting means includes the second abnormality detecting means.
10. The anti-theft device according to claim 9, further comprising a light receiving element that receives external light when the housing is removed from the desired location. 14. The second abnormality detecting means includes the second abnormality detecting means.
10. The anti-theft device according to claim 9, which is a vibration detecting means for detecting the vibration of the housing. 15. The second abnormality detecting means includes the second abnormality detecting means.
10. The anti-theft device according to claim 9, wherein the anti-theft device is a posture detection unit that detects a posture of the housing.