JPH0414575A - Burglarproof device - Google Patents

Abstract

PURPOSE:To prevent burglar by providing a detection signal canceling means to invalidate the output of a switching means to an alarm controlling circuit in a state to maintain an armed state when a regular unlocking signal is generated. CONSTITUTION:An infrared-ray light receiving circuit 141 is provided to the rear of a vehicle, and it is connected to a detection signal canceling circuit 140. An output is provided to a timer 144 when a comparator 142 in the circuit 140 compares the output signal from the circuit 141 with a code signal stored in a memory circuit 143 and when they match with each other. In addition, an actuator 145 to unlock a locking device is operated to open a trunk lid 87. Then, even if the output of a short pulse width is generated from a one-shot multivibrator 146, the output of the trunk lid 87 is so invalidated that an RS flip-flop 97 remains in a state of setting without operating a one-shot vibrator 148 to change-over automatically in a state of alarm.

Description

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

[4] For example, as disclosed in US 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 unlocking the lock using a regular key, which may reduce the anti-theft effect.

Furthermore, since the trunk lid opening/closing detection switch is not linked to the opening/closing detection switch on the door side, it has not been 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. Furthermore, the present invention provides an anti-theft device that can be linked to a switch of an additional opening/closing part of a trunk lid or the like by connecting a simplified circuit without adding an alarm control circuit. The purpose is to

The theft prevention device of the present invention for use as a security device includes a switch means for detecting opening/closing of an opening/closing part, an alarm device, and an armed state or an armed state that generates an alarm signal for activating the alarm device when receiving the output of the switch means. It has an alarm control circuit that can be switched between a disabled state in which no occurrence occurs and an alarm state in which the alarm device is activated. When a regular unlock signal occurs,
A detection signal canceling means is provided for disabling the output of the switching means to the alarm control circuit while the armed state is maintained. For example, when a regular unlocking signal for unlocking a specific opening/closing section is generated, the detection signal of the switch means for detecting the opening/closing of that opening/closing section is invalidated. Further, when a remote control signal containing a predetermined code signal is received or when the lock is unlocked using a regular key, a regular unlocking signal is generated. The detection signal canceling means includes a timer that generates an output when the regular unlocking means occurs, and a one-shot multivibrator that generates a pulse having a shorter pulse width than the output of the timer when the switch means is activated. and a gate circuit connected to the timer and the one-shot multivibrator.

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 disarmed state to the arm ready 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.

Furthermore, in this invention, when a regular unlocking signal is generated,
The detection signal canceling means disables the output of the switching means to the alarm control circuit while maintaining the armed state. Therefore, if the opening section is subsequently opened illegally, the theft alarm circuit is automatically switched to the alarm state.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

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 40 , and a control signal generation circuit 42 that is activated by the output of the state detection circuit 41 . The sensor circuit 40 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 4o 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 and collector of the transistor 53 are connected to the input port 1 of the state detection circuit 41 via a diode 60 and to the base of the transistor 62 via a diode 61, respectively. The emitter of the transistor 62 is connected to the power supply, and the collector is connected to the input port 7 of the state detection circuit 41 via the reset circuit 63. 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, and an input port I.
It has a resistor 66 and a diode 67 connected in parallel between 7 and ground.

The state detection circuit 41 is a CPU composed of a one-chip microcomputer. A ROM 68 is connected to the input port I2 of the state detection circuit 41. ROM68
A reference code is stored in . Status detection circuit 4
Transistors 70 and 71 as driver circuits are connected to the output ports 03 and ◯ of 1 through 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 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. Status detection circuit 4
The input port 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 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
A trigger signal is applied to the input port 7 of the state detection circuit 41 via the state detection circuit 3, and the state detection circuit 41 is activated. Therefore, the state detection circuit 41 uses the storage means to store the input port number 1.
Stores the light reception signal supplied to the At the same time or after this, the state detection circuit 41 reads the reference code stored in the ROM 68 into RAM (Rando Access
The data is read out into a storage means such as Me■ory).

Here, the comparison means provided in the state detection circuit 41 compares the reception code included in the signal from the transmitter 1 supplied through the light receiving circuit 50 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 input port 5 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. . Further, when the alarm control circuit 2 is in an alarm state or a non-alarm state, the AND gate 108 generates a high output or a 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
When is in a disarmed state, i.e.

When the input ports Is and I of the state detection circuit 41 are both 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). Therefore, transistor 7
0 is turned on and a signal is applied to the 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 5 or the input port of the state detection circuit 41 is receiving a high output.
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 8
6 is connected to the other input terminal of the AND gate 92 and the OR gate 93. The output terminal of the AND gate 92 and the keylock switch 82 are connected to an AND gate 94, respectively.

AND gate 94 is connected to timer circuit 96 via OR gate 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 100 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 ant gate 104. and 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 generation 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.

An output terminal of the ant gate 98 is connected to a set terminal of the R/S flip-flop 106 and a 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 M110, 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 123.

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 123.

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 AND gate 92 generates an output when all opening/closing parts of the vehicle are closed and the door switch 83, tamper switch 84, fuel lid switch 85, and hood switch 86 are all off. Further, when the lock device is locked with the key or when an output is generated from the output port ○ of the status detection circuit 41 of the remote control circuit 1 using electromagnetic waves, the AND gate 94 generates an output and the timer circuit 96 is activated. . The timer circuit 96 is approximately 3
The time of 0 seconds is counted, and during this counting, the robot is in an armed and ready state. When 30 seconds have passed, an output is generated from the timer circuit 96, the R/S flip-flop 97 is switched to the set state, and an output is generated from the Q output terminal. This state is an armed state. This armed state also applies when a mechanical keyless lock operation is performed.

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.

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, the door switch 83. One of the 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, timer circuit r07 is activated and an intermittent signal is applied to the base of transistor 109 via ant gate 108. Therefore, the alarm system [110 is activated for 3 minutes. The key unlock switch 8 is activated 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.
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 For this reason, 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, since the display device 120 is driven at a different frequency when the AND gate 104 is turned on, the operator can close the open 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 detection signal canceling circuit 140.

A comparison circuit 142 of the detection signal cancellation circuit 140 compares the output signal of the infrared light receiving circuit 141 with the code signal stored in the storage circuit 143, and generates an output to the timer 144 when they match. Therefore, timer 144
operates the actuator 145 that unlocks the trunk lid locking device to open the trunk lid. The output of timer 144 is, for example, a 500 millisecond pulse.

When the trunk lid is opened, the trunk lid switch 87 is turned on. As a result, the trunk room lamp 150 is turned on, and the one-shot multivibrator 146 generates a pulse having a pulse width of 50 to 100 milliseconds, which is significantly smaller than the pulse of the timer 144. The output of the timer 144 is applied to an inverting input terminal of an AND gate 147 (lateral ratio signal canceling means), and the AND gate 147 is maintained in an OFF state. Therefore, even if an output with a short pulse width is generated from the one-shot multivibrator 146, the one-shot multivibrator 148 is not activated, so no output is given to the AND gate 98 through the OR gate 149. Therefore, the output of the trunk lid 87 can be disabled while the RS flip-flop 97 remains set.

However, when the trunk lid is illegally unlocked, the output of the timer 144 is not generated and only the output of the one-shot multivibrator 146 is generated.
It will be appreciated that the output is provided to AND gate 98 through 9.

In the above embodiment, an example was shown in which the signal of a specific trunk lid switch is disabled when the trunk lid is unlocked using an infrared signal. However, between the key unlock switch 80 and the door switch 83, the trunk key unlock switch 81 and the trunk lid switch 87
It is also possible to provide a detection signal canceling circuit at or at the input terminal of the AND gate 98. It may be configured such that when the ignition switch is turned on, the armed state is switched to the disarmed state.

Further, the output of the AND gate 147 or the one-shot multivibrator 148 shown in FIG. 3 may be connected to the base of a transistor 148 which provides the same function as the various switches 83 to 86, as shown in FIG.

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.

15I Achievements With the anti-theft device of the present invention, a specific opening/closing section can 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 the armed state, the alarm device can be activated when the other opening/closing parts are tampered with. Therefore, the anti-theft effect 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 perform unlocking and locking operations on the driver's seat side, making handling extremely easy. It becomes easier.

■ 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.

■ By connecting a simplified circuit without adding an alarm control circuit, the alarm control circuit can be linked to a switch for an additional opening/closing part such as a trunk lid.

[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 detection circuit diagram. FIG. 4 is a circuit diagram of a signal canceling circuit showing another embodiment of the present invention. 10. remote control circuit, 20. Alarm control circuit, 82-87
1. Switch (switch means), 96. . Timer, 110. , alarm (alarm device), 140°, detection signal cancellation circuit,

Claims (4)

[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 state to be activated and an alarm control circuit that can be switched to an alarm state, the detection method disables the output of the switching means to the alarm control circuit while maintaining the armed state when a regular unlocking signal is generated. An anti-theft device characterized by being provided with signal canceling means. (2) The anti-theft device according to claim (1), wherein when a regular unlocking signal for unlocking a specific opening/closing section is generated, a detection signal of a switch means for detecting opening/closing of the opening/closing section is invalidated. (3) The anti-theft device according to claim 1, wherein the official unlocking signal is generated when a remote control signal including a predetermined code signal is received or when the lock is unlocked using an official key. (4) The detection signal canceling means includes a timer that generates an output when the regular unlocking means occurs, and a one-shot multi-timer that generates a pulse with a pulse width shorter than the output of the timer when the switch means is activated. vibrator and
The anti-theft device according to claim 1, further comprising a gate circuit connected to the timer and the one-shot multivibrator.