JPH0414576A - Burglarproof device - Google Patents

Abstract

PURPOSE:To prevent burglar by providing a pulse generation circuit connected to a switching means, a specific waveform pulse generation circuit to generate an output having waveform different from the output waveform of the pulse generation circuit and a waveform detection circuit. CONSTITUTION:A waveform detection circuit 153 discriminates the output of a pulse generation circuit 139 from the output of a specific waveform pulse generation circuit 144 based on the pulse number and pulse width. When output signals of the generation circuit 139 and generation circuit 144 are received to generate an output only from the generation circuit 139, alarm signals from an alarm controlling circuit 2 are generated. After that, when the detection circuit 153 detects both outputs of the generation circuit 139 and generation circuit 144, the output is not provided to the controlling circuit 2. At that time, the controlling circuit 2 is held in an armed state, and the alarm signals are not generated. After that, when an open section is unjustly opened, a burglar alarm circuit is automatically switched in a state of alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an anti-theft device, and more particularly to an anti-theft device in which an alarm is activated when an opening/closing part is illegally opened.

For example, as disclosed in U.S. Pat. No. 3,781,854, a theft alarm system for an automobile is known. In this automobile theft alarm device, when all the opening/closing parts of the automobile are closed and locked, the theft alarm device is switched from a disabled state to an armed state. If an opening/closing part such as a door, trunk, or hood is opened/closed illegally in an armed state, an alarm is automatically generated, thereby preventing theft of the automobile.

Further, as disclosed in Japanese Patent Publication No. 11509/1983, a remote control lock control device is known that unlocks a lock device using infrared rays containing a predetermined code number. This remote control lock control device.

A transmitting device includes a manually operated switch, and receives infrared rays emitted from the transmitting device when the switch is pressed, and supplies an unlocking signal to the locking device when a predetermined code number included in the infrared rays is detected. and a receiving device. This remote control lock control device can unlock the lock device by emitting infrared rays from a position approximately 1 m or more in front of the sensor section of the light receiving device. Therefore, there is an advantage that the unlocking operation by pressing the switch of the transmitting device can be simplified and accelerated.

Conventionally, after setting the anti-theft device to the armed state, when the driver's side door is unlocked using a regular key, the armed state is switched to the disarmed state.

Therefore, when opening the trunk lid or other opening/closing parts in the armed state, the driver's side door must be unlocked with a regular key. In addition, in order to obtain the anti-theft state again, after closing all the opening/closing parts, it is necessary to set the anti-theft device on the door on the driver's seat side from the beginning and switch the device from the disarmed state to the armed state. Further, when switching to the armed state, it was necessary to wait for about 30 seconds during the timer operation time in the armed preparation state. Therefore, in the conventional anti-theft device, switching between the armed state and the disarmed state requires time and effort.

Furthermore, in the conventional art, the entire anti-theft device is switched to a disabled state by the unlocking operation of the authorized key, so the anti-theft device may be disabled.

Also, the trunk lid open/close detection switch is not linked to the door open/close detection switch.

It was not possible to detect unauthorized unlocking of the trunk lid and generate an alarm. For this reason, it was necessary to add an alarm control circuit to the trunk lid.

This invention solves the above-mentioned drawbacks and, after the anti-theft device is once switched to the armed state, when a regular unlocking signal is generated, the opening/closing part is opened without activating the alarm device while maintaining the armed state. The purpose of the present invention is to provide an anti-theft device that can prevent theft.

Means for Solving the Problems The anti-theft device of the present invention includes a switch means for detecting opening/closing of an opening/closing part, an alarm device, and each generates an alarm signal that activates the alarm device when the output of the switch means is received. The alarm control circuit has an alarm control circuit that can be switched between an armed state in which the alarm occurs, a disabled state in which the alarm does not occur, and an alarm state in which the alarm device is activated. This theft prevention device also includes a pulse generation circuit connected to the switch means, and a specific waveform pulse generation circuit that generates an output with a waveform different from the output waveform of the pulse generation circuit when an unlocking signal is properly generated. and receiving the output signals of the pulse generating circuit and the specific waveform pulse generating circuit, and generating an alarm signal of the alarm control circuit when only the output of the pulse generating circuit is generated, and generating the alarm signal of the alarm control circuit. and a waveform detection circuit that does not cause the alarm control circuit to generate an alarm signal when the alarm generates an output. The specific waveform pulse generation circuit generates an output having a different number of pulses or pulse width from the output of the pulse generation circuit. The waveform detection circuit distinguishes between the output of the pulse generation circuit and the output of the specific waveform pulse generation circuit based on the number of pulses or the pulse width.

Further, in an embodiment of the present invention, a pulse generation circuit connected to the five switch means and a specific waveform pulse generator that generates an output with a waveform different from the output waveform of the pulse generation circuit when an unlocking signal is normally generated. A circuit, a load driven by the output of the pulse generation circuit and the specific waveform pulse generation circuit, a power supply that supplies power to the load, a voltage detection circuit that detects the voltage level of the power supply, and a voltage detection circuit based on the power supply level of the voltage detection circuit. When it is determined that only the output of the pulse generation circuit has been generated, the alarm control circuit generates an alarm signal, and when it is determined that the pulse generation circuit and the specific waveform pulse generation circuit have generated output, the alarm control circuit generates an alarm signal. and a waveform detection circuit that does not generate an alarm signal.

When a control signal is generated by an electromagnetic wave containing a genuine key or a genuine code signal, the alarm control circuit is switched to an armed state or a disarmed state when it is in an armed state or an alarm state. Further, when the alarm control circuit is in the disabled state, it can be switched to the armed state by a control signal from a regular key or a remote control circuit. In this case, the timer of the alarm control circuit operates for a certain period of time, and the alarm control circuit is switched from the disabled state to the armed preparation state. The alarm control circuit generates an alarm signal when it receives a trigger signal from a switch means provided in the vehicle in the armed state. This alarm signal stops when the alarm state is switched from the alarm state to the disabled state or the armed state by an unlock signal from a regular key or a control signal from a remote control device.

The timer of the alarm control circuit is activated for a certain period of time by the armed signal from the remote control device, and the alarm control circuit is switched from the disabled state to the armed preparation state. The display device is activated during the armed ready state, and after the timer has counted a certain period of time, the alarm control circuit is switched from the disarmed state to the armed state.

Further, in the present invention, the waveform detection circuit distinguishes the outputs of the pulse generation circuit and the specific waveform pulse generation circuit based on the number of pulses or the pulse width, receives the output signals of the pulse generation circuit and the specific waveform pulse generation circuit, and detects the pulse. Generates an alarm signal from the alarm control circuit when only the output of the generation circuit occurs. However, when the waveform detection circuit detects both the outputs of the pulse generation circuit and the specific waveform pulse generation circuit, it does not provide an output to the alarm control circuit. Therefore, the alarm control circuit is held in an armed state but does not generate an alarm signal. Thereafter, when the opening section is illegally opened, the theft alarm circuit is automatically switched to the alarm state.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows a circuit diagram of a remote control circuit 1. As shown in FIG. The remote control circuit 1 includes a sensor circuit 40, a state detection circuit 41 that receives a signal from the sensor circuit 4O, and a control signal generation circuit 42 that is activated by the output of the state detection circuit 41. The sensor circuit 4o includes a one-chip infrared light receiving circuit 50 and an amplifier circuit 51 that amplifies a signal received by the infrared light receiving circuit 50 and supplies the amplified signal to the state detection circuit 41. Amplification circuit 51
has two transistors 52 and 53. The positive line 54 of the sensor circuit 40 is connected to the output port ◯ of the state detection circuit 41, and the negative line 55 of the sensor circuit 40 is grounded. Smoothing capacitors 56 and 57 are connected in parallel to the positive line 54 and the negative line 55. Also,
The positive line 54 is a display light emitting diode 58 and a resistor 5.
9 to the output port 02 of the state detection circuit 41.

The emitter of the transistor 52 is connected to the positive line 54 , the base is connected to the light receiving circuit 50 , and the collector is connected to the base of the transistor 53 . The emitter of the transistor 53 is connected to the negative line and the collector is connected to the input port (1) of the state detection circuit 41 via a diode 60, and is connected to the base of the transistor 62 via a diode 61. The emitter of transistor 62 is connected to a power supply;
The collector is connected to the state detection circuit 41 via the reset circuit 63.
is connected to the input port 7. The reset circuit 63 includes a resistor 64 connected between the collector of the transistor 62 and the ground, a capacitor 65 connected between the collector of the transistor 62 and the input port 7, and between the input port 7 and the ground. It has a resistor 66 and a diode 67 connected in parallel.

The state detection circuit 41 is a CPU composed of a one-chip microcomputer. A ROM 68 is connected to input ports 2 to I4 of the state detection circuit 41. ROM68
A reference code is stored in . State detection circuit 4
Transistors 70 and 71 as driver circuits are connected to output ports 03 and 04 of No. 1 via resistors 72 and 73, respectively. The collector of transistor 70 is the second
It is connected to the inverting input terminal of an AND gate 94 of the alarm control circuit 2 shown in the figure, and its emitter is grounded. Further, the collector of the transistor 71 is connected to the OR gate 1 of the alarm control circuit 2.
30, and the emitter is grounded. Further, the input port E of the state detection circuit 41 is connected to the output terminal of the RS flip-flop 97 of the alarm control circuit 2 in order to detect the armed state of the alarm control circuit 2. State detection circuit 4
The input port 6 of No. 1 is connected to the output of the AND gate 108 of the alarm control circuit 2 in order to detect the operating state of the alarm device 110 as an alarm device.

In the above configuration, when a switch of a transmitting device (not shown) is activated, an infrared ray including a predetermined code is generated from an infrared ray emitting diode.

This infrared light is received by the infrared light receiving circuit 50.

The signal generated by the infrared light receiving circuit 50 is transmitted to the amplifier circuit 51.
The signal is supplied to the input port I of the state detection circuit 41 via. At the same time, when the amplifier circuit 51 is turned on, the transistor 62 is turned on. Therefore, the reset circuit 6
3, a trigger signal is applied to the input port I of the state detection circuit 41, and the state detection circuit 41 is activated. Therefore, the state detection circuit 41 uses the storage means to input the input data.
Stores the light reception signal supplied to the At the same time or after this, the state detection circuit 41 transfers the reference code stored in the ROM 68 to the RAM (Random Access
Memory) or the like.

Here, the comparison means provided in the state detection circuit 41 compares the received code code included in the signal from the transmitter 1 supplied through the light receiving circuit 5o and the reference code stored in the ROM 68. . When the received reception code and the read reference code do not match, the state detection circuit 41 is not activated. Conversely, when the reference code and the received code match, it is determined whether the signal at the input port is at a high level. When the alarm control circuit 2 is in an armed state or a disarmed state, the RS flip-flop 97 generates a high output or a low output, so the alarm control circuit 2 can detect the armed state by the output of the RS flip-flop 97. . Furthermore, when the alarm control circuit 2 is in an alarm state or a non-alarm state, the ant gate 108 generates a high or low output, so the alarm control circuit 2 input port 6 detects the alarm state by the output of the AND gate 108. be able to. Alarm control circuit 2
is in the disarmed state, that is, the state detection circuit 41
When both the input ports 5 and 5 of the input port 1 are receiving low output, the state detection circuit 41 sends a control signal from the output port 03 to the transistor 70 for a certain period of time (for example, 0.5 seconds).
Send. Therefore, the transistor 70 is turned on,
A signal is applied to AND gate 94.

The state control circuit 41 detects when the alarm control circuit 2 is in the armed state or the alarm state, that is, when either the input port 6 or the input port 6 of the state detection circuit 41 is receiving high power.
The state detection circuit 41 sends a control signal from the output port 04 to the transistor 71 for a certain period of time (for example, 0.5 seconds).

Therefore, transistor 71 is turned on and a signal is applied to OR gate 130.

The alarm control circuit 2 includes a key unlock switch 80 that is turned on when the lock device is unlocked with the key, and a trunk key unlock switch 81 that is turned on when the trunk is unlocked with the key. Further, a key lock switch 82 is provided which is turned on when the lock device is locked with a key. Similar to conventional vehicles, there is a door switch 83 that is turned on when the door is opened, a tamper switch 84 that is turned on when the locking device is illegally broken, and a tamper switch 84 that is turned on when the trunk is opened. A fuel lid switch 85 and a foot switch 86 that is turned on when the hood is opened are provided. switch 83
86 constitutes a switch means.

In addition, a mechanical keyless lock that does not require a key is used to close the vehicle door. Mechanical keyless locks have a mechanism that automatically locks the door by moving the lock knob on the door to the lock position and then closing the door while pulling the outdoor handle. In order to interlock this mechanism and to detect the locked position of the lock knob, state switches 90 and 91 are provided in the left and right doors of the vehicle, respectively, as state detecting means for detecting the locked position of the lock knob.

The switches 83 to 85 are connected to the input terminals of each one of the AND gate 92 and the OR gate 93, and the foot switch 86
is connected to the other input terminal of AND gate 92 and OR gate 93. The output terminal of the AND gate 92 and the key lock switch 82 are connected to an AND gate 94, respectively.

Ant gate 94 is connected to a timer circuit 96 via an orgelt 95. Timer circuit 96 provides an output for, for example, 30 seconds. The output terminal of the timer circuit 96 is connected to a set terminal of an R/S flip-flop 97 and a one-shot multivibrator 99. The Q output terminal of R/S flip-flop 97 is connected to one input terminal of AND gate 98. The other input terminal of AND gate 98 is connected to the output terminal of pulse shaping circuit "00" connected to OR gate 93 via OR gate 149.

Further, a detection signal canceling circuit (detection signal canceling means) 140 shown in FIG. 3 is connected to the OR gate 149.

State switches 90 and 91 are connected to one input terminal of AND gate 101, and the output terminal of OR gate 93 is connected to the other input terminal of AND gate 101. The output terminal of OR gate 93 is connected to one input terminal of delay circuit 103 and AND gate 104. ant gate 1
The output terminal of the AND gate 102 is connected to the first input terminal of the AND gate 102, and the state switches 90 and 91 and the delay circuit 103 are connected to the second and third input terminals of the AND gate 102, respectively. A pulse generating circuit 105 is connected to the other input terminal of the AND gate 104, and an output terminal of the AND gate 104 is connected to an OR gate 121.

The display device 120 is a light emitting element such as a light emitting diode or a sounding element such as a buzzer. Display device 120 is connected to the collector of transistor 122, and the emitter of transistor 122 is grounded. The base of transistor 122 is connected to OR gate 121.

The output terminal of the AND gate 98 is connected to the set terminal of the R/S flip-flop 106 and the timer circuit 107. The Q output terminal of R/S flip-flop 106 is connected to starter circuit 112 .

The timer circuit 107 provides an output for, for example, three minutes to one input terminal of the AND gate 108. and gate 10
A pulse generation circuit 114 is connected to the other input terminal of 8. The output terminal of AND gate 108 is transistor 1
The collector of the transistor 109 is connected to the alarm device 11o, and the emitter is grounded. As the alarm device 110, a vehicle horn or lamp can be used as is.

The output terminal of the timer circuit 107 is connected to the reset terminal of the R/S flip-flop 106 through the one-shot multivibrator 111 and the OR gate 113, and is also connected to the clear terminal of the timer circuit 96 through the OR gate 120.

Further, state switches 90 and 91 are connected to a clear terminal of a timer circuit 96 via an inverter 89 and an OR gate 120.

The key unlock switch 80 and the trunk key unlock switch 81 are connected to a pulse forming circuit 131 via an OR gate 130. The output terminal of the pulse forming circuit 131 is connected to the OR gate 123 and the OR gate 113. The output terminal of the one-shot multivibrator 99 is connected to the reset terminal of the R/S flip-flop 132, and the output terminal of the OR gate 95 is connected to the set terminal of the R/S flip-flop 132. The Q output terminal of R/S flip-flop 132 is connected to one input terminal of AND gate 133. A pulse generation circuit 139 is connected to the other input terminal of the AND gate 133. The output terminal of AND gate 133 is connected to OR gate 121.

In the alarm control circuit 2, the OR gate 93 generates a low level output when all opening/closing parts of the vehicle are closed and the door switch 83, tamper switch 84, fuel lid switch 85, and foot switch 86 are all off.

Therefore, the other input terminal of AND gate 101 is at a high level. In this state, when the door on the passenger seat side is locked and closed, the state switch 91 is turned off.

Furthermore, if the driver's side door lock knob is pressed and the door is closed by pulling the door handle from the outside of the vehicle, the driver's side door will also be locked and the status switch 90 will be closed.
is also turned off. When both state switches 90 and 91 are turned off, AND gate 101 is turned on. Therefore,
AND gate 102 is also turned on. This is because the delay circuit 103 switches to the armed state only when the driver's side door is finally locked. The output generated from AND gate 102 causes pulse shaping circuit 138 to generate an output to activate timer circuit 96 via OR gate 95 . Therefore, as mentioned above, the R/S flip-flop 9
7 can be set to switch to armed state.

In the armed state, when any one of the opening/closing parts is opened, any one of the door switch 83, tamper switch 84, fuel lid switch 85, and foot switch 86 is turned on. Therefore, R/S flip-flop 106 is set through OR gate 93 and AND gate 98, and driving of starter circuit 112 is blocked. At the same time, the timer circuit 107 is activated and an intermittent signal is applied to the base of the transistor 109 via the antgelt 108. Therefore, the alarm bag @110 is activated for 3 minutes. The key is unlocked when the R/S flip-flop 97 is in the armed state in which it is maintained in the set state, in the alarm state in which the alarm device 110 is activated, or in the armed ready state in which the timer circuit 96 is activated. switch 8
When the 0 or trunk key unlock switch 81 is turned on, the timer circuits 96 and 107 are cleared, the R/S flip-flops 97 and 106 are reset, and the state is switched to a disarmed state.

Display device 120 may be driven in various ways. For example, when timer circuit 96 is activated, R/S flip-flop 132 is set. Therefore, and gate 1
33 and the transistor 122 via the OR gate 121
An intermittent signal is supplied to the base of the Therefore, the display device 120 is activated intermittently. Further, when the timer circuit 96 is operating even though a part of the switching section is open due to malfunction, the AND gate 104 is turned on and the transistor 122 is operated intermittently via the OR gate 121. In this case, pulse generating circuits 105 and 139 generate outputs of different frequencies.

Therefore, when the AND gate 104 is turned on, the display bag @120 is driven at a different frequency, so that the operator can close the opened opening and closing section and shift to the armed state again.

As shown in Figure 3, an infrared receiver circuit 1 is installed at the rear of the vehicle.
41 is provided. The light receiving sensor of the infrared light receiving circuit 141 is arranged within the tail lamp, for example. The infrared light receiving circuit 141 is connected to the pulse generation detection circuit 140. The comparison circuit 142 of the pulse generation inspection circuit 140 compares the output signal of the infrared light receiving circuit 141 with the code signal stored in the storage circuit 143, and when they match, generates an output to the specific waveform pulse generation circuit 144. . In the illustrated embodiment, the specific waveform pulse generation circuit 144 generates two short duration pulses 144a and 144b and one long duration pulse 144c. For example, pulse widths of pulses 144a and 144b are 50 milliseconds or less, preferably 1-10 milliseconds, during which actuator 145 is not actuated, and pulse width 144C is 500 milliseconds, which is sufficient to actuate actuator 145. A trunk lid switch 87 and a trunk opener switch 148 are connected to an OR gate 146 to which the output of the specific waveform pulse generation circuit 144 is applied via one-shot multivibrators 149 and 147, respectively. Although not shown, a trunk room lamp may be connected to the trunk lid switch 87. The pulse width of the one-shot multivibrator 149 is, for example, 50 milliseconds when the actuator 145 is not actuated. One-shot multivibrator 147 has a pulse width long enough to actuate actuator 145 . The output of OR gate 146 turns on relay 151 through drive circuit 150. Therefore, although current flows to the actuator 145, the specific waveform pulse generation circuit 144 and the one-shot multivibrator 14
7 actuates the actuator 145, but the output of the one-shot multivibrator 149 does not actuate the actuator i45. Therefore, the output of the specific waveform pulse generating circuit 144 operates the actuator 145 that unlocks the trunk lid locking device, thereby opening the trunk lid. When the trunk lid is opened, the trunk lid switch 87 is turned on. As a result, the one-shot multivibrator 149 generates a pulse having a time width of 50 milliseconds or less, which is significantly smaller than the pulse of the specific waveform pulse generation circuit 144.

As with the trunk lid switch 87, a foot switch 168 may be provided. Foot switch 1
68 is a load 165 such as a hood actuator or resistance
One-shot multivibrator 16 to energize
7. It has a drive circuit 166 and a relay 161. Power supply 1
60 is connected to relays 151 and 161 and voltage detection circuit 152. The voltage detection circuit can use a differential amplifier that has a feedback circuit consisting of a capacitor and a resistor connected in parallel and whose reference level can be adjusted using a variable resistor. The output of the voltage detection circuit 152 is sent to the waveform detection circuit 15.
3, and the output of the waveform detection circuit 153 is applied to an OR gate 149 (FIG. 2).

FIG. 4 shows a detailed circuit diagram as an example of the waveform detection circuit 153. That is, the waveform detection circuit 153 is the voltage detection circuit 1
A one-shot multivibrator 170 that inverts the output of the one-shot multivibrator 170 for 1 to 50 milliseconds, a shift register 171 that counts the output of the one-shot multivibrator 170, and a one-shot multivibrator 171 that inverts the output of the one-shot multivibrator 170 for a certain period of time after the output of the one-shot multivibrator 170 is generated. a timer 172 for resetting the shift register 171; an AND gate 174 having an input terminal connected to a first terminal of the shift register 171 via a delay circuit 173; and an inverting input terminal connected to a second terminal of the shift register 171. has.

In the above configuration, when the drive circuit 150 or 166 is activated, the voltage detection circuit 152 generates a low level output, so the shift register 171 is connected to the voltage detection circuit 152.
Count the output of When the trunk lid lock device is properly unlocked using an infrared signal, the specific waveform pulse generation circuit 144 generates a specific pulse, and the waveform detection circuit 153
detects this and does not give a signal to OR gate 149.

That is, the specific waveform pulse generation circuit 144 generates two short time width pulses 144a and 144b, these pulses are counted by the shift register 171, and output to either the first terminal or the second terminal of the shift register 171. occurs. Therefore, AND gate 174 produces no output. However, when the trunk lid is illegally unlocked, the output of the specific waveform pulse generation circuit 144 is not generated, and only the output of the one-shot multivibrator 149 is generated due to the ON operation of the trunk lid switch 87. counts only one pulse. Therefore, an output is generated only from the first terminal of the shift register 171, and the AND gate 174 provides an output to the OR gate 149.

As is clear from FIG. 5 showing another embodiment of the invention, it is also possible to connect the waveform detection circuit 153 to the output terminal of the OR gate 146.

Furthermore, as an alternative method, instead of counting the number of pulses, different pulse widths are given to the output of the specific waveform pulse generation circuit and the output of the one-shot multivibrator 146, and the time width of the pulses is counted in the waveform detection circuit 153. By doing so, it is also possible to control the output to the OR gate 149.

In the above embodiment, when unlocking the trunk lid using an infrared signal, an example was shown in which the trunk lid switch signal is disabled, but the key unlock switch 80
and door switch 83.

It can also be provided anywhere or all between the trunk key unlock switch 81 and the trunk lid switch 87. It may be configured such that when the ignition switch is turned on, the armed state is switched to the disarmed state.

Further, in the above embodiment, the theft prevention of a vehicle having multiple opening/closing parts has been described, but the present invention can be applied not only to vehicles but also to parts of buildings where entrance/exit control is required, such as opening/closing parts or locking parts. Is possible.

The anti-theft device of the present invention allows a specific opening/closing portion to be opened without activating the alarm device while maintaining the armed state. Therefore, the following advantages can be obtained.

(2) Since the opening/closing parts other than the specific opening/closing part are held in an armed state, the alarm device can be activated when the other opening/closing parts are tampered with. Therefore, the anti-theft device can be significantly improved.

■ When setting a specific opening/closing part that has been opened to the armed state again, it is sufficient to simply close the opening/closing part that has been opened. Therefore, it is possible to switch between the armed state and the disarmed state by properly unlocking and locking a specific opening/closing part without having to unlock and lock only the specific door on the driver's seat side, making it extremely easy to handle. Become.

■ As long as the door is unlocked properly, it is possible to avoid the inconvenience of inadvertently activating the alarm even when opening/closing parts other than the driver's side door.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a remote control circuit used in an anti-theft device according to an embodiment of the present invention, Figure 2 is a circuit diagram of an alarm control circuit used in combination with the electric circuit of Figure 1, and Figure 3 is a pulse FIG. 4 is a circuit diagram showing a pulse generation detection circuit, FIG. 4 is a detailed circuit diagram of the waveform detection circuit, and FIG. 5 is a circuit diagram showing another embodiment of the pulse generation detection circuit. 10. Remote control circuit, 21. Alarm control circuit, 82-87
1. Switch (switch means), 96. .

Claims (7)

[Claims] (1) A switch means for detecting opening/closing of an opening/closing part, an alarm device, and an armed state in which an alarm signal that activates the alarm device is generated when the output of the switch means is received, or a disarmed state in which the alarm signal does not occur, respectively, and an alarm device. In an anti-theft device having an alarm control circuit that can be switched to an activated alarm state, the pulse generation circuit connected to the switch means is different from the output waveform of the pulse generation circuit when an unlocking signal is normally generated. A specific waveform pulse generation circuit that generates a waveform output, and receiving the output signals of the pulse generation circuit and the specific waveform pulse generation circuit, and generating an alarm signal of an alarm control circuit when only the output of the pulse generation circuit is generated. An anti-theft device, characterized in that the alarm control circuit includes a waveform detection circuit that does not generate an alarm signal when the outputs of the pulse generation circuit and the specific waveform pulse generation circuit are generated. (2) The anti-theft device according to claim (1), wherein the specific waveform pulse generation circuit generates an output having a different number of pulses or pulse width from the output of the pulse generation circuit. (3) The anti-theft device according to claim 1, wherein the waveform detection circuit distinguishes between the outputs of the pulse generation circuit and the specific waveform pulse generation circuit based on the number of pulses or the pulse width. (4) A switch means for detecting opening/closing of the opening/closing part, an alarm device, and an armed state in which an alarm signal to activate the alarm device is generated when the output of the switch means is received, or a disarmed state in which the alarm signal does not occur, and the alarm device. In an anti-theft device having an alarm control circuit that can be switched to an activated alarm state, the pulse generation circuit connected to the switch means is different from the output waveform of the pulse generation circuit when an unlocking signal is normally generated. A specific waveform pulse generation circuit that generates a waveform output, a load driven by the output of the pulse generation circuit and the specific waveform pulse generation circuit, a power supply that supplies power to the load, and a voltage detection circuit that detects the voltage level of the power supply. and when it is determined that only the output of the pulse generation circuit is generated based on the power level of the voltage detection circuit, an alarm signal of the alarm control circuit is generated, and the output of the pulse generation circuit and the specific waveform pulse generation circuit is An anti-theft device characterized in that an alarm control circuit is provided with a waveform detection circuit that does not generate an alarm signal when it is determined that an alarm has occurred. (5) The anti-theft device according to claim (4), wherein the load is an actuator that drives a door lock device. (6) The anti-theft device according to claim (4), wherein the specific waveform pulse generation circuit generates an output having a different number of pulses or pulse width from the output of the pulse generation circuit. (7) The anti-theft device according to claim (4), wherein the waveform detection circuit distinguishes the outputs of the pulse generation circuit and the specific waveform pulse generation circuit based on the number of pulses or the pulse width.