JPH0587416B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an anti-theft device installed in a vehicle or the like to prevent unauthorized unlocking of a key cylinder lock.

[Conventional technology]

In this type of conventional automobile theft alarm device, when a rotation detection switch is turned on by an unlocking operation using a key in the unlocking direction, the theft prevention state is canceled and the key cylinder is rotated, for example. In case of unauthorized unlocking such as picking, the alarm device will not be activated when the door is opened, and it will not be determined that the door has been unlocked illegally.

[Problem to be solved by the invention]

The present invention can be applied when an unlocking operation is performed by rotating a key cylinder in the unlocking direction using a key, or when an operation is performed to move a key cylinder to an unlocking position without using a key. To provide an anti-theft device capable of determining illegal unlocking such as picking when a door lock is unlocked, and issuing an alarm when the door is opened.

[Means for solving problems]

In the present invention, which achieves the above object, the key cylinder device is equipped with an unlock detection switch means for detecting the unlock position of the key, a light receiving element, and a switch on means for turning on the key switch means at the unlock operation position. and a switch means for turning on the key by the switch-on means, a key specific code generating means for outputting a preset specific code signal when the switch means is turned on, and a specific code generating means for the key. and a light emitting element that is controlled by an output and operates to emit light to output a specific code signal to the light receiving element, and the light receiving element compares the input specific code signal from the light emitting element with a preset code signal. and a picking signal output means that outputs a picking signal when there is no output from the specific code determining means and when the unlock detection switch means outputs a matching signal. It's there.

[Effect]

In the structure of the present invention, when the key cylinder is rotated to the unlocked position by either normal or unauthorized means, the door lock becomes unlocked. , the unlock detection switch means is turned on, and the picking signal means, which is the alarm generating means, is activated.

In this state, when the key is rotated to the unlocked position of the key cylinder, the switch means provided on the key is turned on. Turning on this switch means activates a specific code generating means provided on the key, and this output is inputted as an output of a light emitting element to a discriminating means that can discriminate the output from this specific code generating means, and a preset code is input. When it is determined that the signals are equal, no picking signal is output from the picking signal output means in the activated state, and therefore, the alarm device is not activated when the door is opened.

However, even if the key rotates to the unlocked position of the key cylinder, if the key cylinder moves to the unlocked position without using the key, no output is generated for comparison with the discriminating means, and the key cylinder is not activated by the key. Even if the key is turned to the lock position, if the key is not equipped with a predetermined means, or even if it is equipped with a predetermined means and outputs a different code, it will be determined that there is a discrepancy from the discriminating means, and the activation will be detected. A picking signal is output from the picking signal output means in the state, and when the door is opened, the alarm device is activated.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 7 show an example in which the anti-theft device of the present invention is applied to a key cylinder device of an automobile.

1 to 3 show the structure of a key cylinder device. On the key cylinder operation surface 1a, a light receiving element (infrared light receiving element) 3 embedded in a condensing crystal 2 is arranged at an unlock position, and two magnets 4 are arranged diametrically. This magnet 4 acts as a switch-on means for turning on the switch means 8 of the key 6, as will be described later.

Furthermore, an unlock detection switch means 5 for detecting rotation in the unlocking direction (detects coincidence of mechanical codes) is disposed in the cylinder portion 1b.

4 and 5 show the structure of the key 6. FIG.
The key 6 is a mold type, and its handle part 6a
Battery 7 and switch means (reed switch) 8 inside
It is equipped with circuit components such as a code generating means 9, a light emitting element (infrared light emitting diode) 10, and a light emitting diode 11. Note that the light emitting element 10 and the light emitting diode 11 are arranged in a partially exposed state on the side surface of the handle portion 6a on the key plate 6b side.
Further, the switch means 8 is arranged at a position near the key plate 6b of the handle portion 6a.

When the key 6 is inserted into the key insertion hole 1c of the key cylinder device 1 and rotated to the unlock position,
The switch means 8 approaches the magnet 4 and turns on, and the light emitting element 10 faces the light receiving element 3.

FIG. 6 shows a circuit diagram of the key 6. Reference numeral 12 in the figure is a power switching circuit, which activates the switching means 8 by the magnet 4 when the key 6 is used to unlock the door.
It works when turned on.

When the power switching circuit 12 operates, the code generating means 9 operates and the light emitting element 10
, and a specific code signal is output (transmitted) from the light emitting element 10.

The code generating means 9 is composed of a reset circuit 13, an oscillation circuit 14, an output circuit 15, a frequency dividing circuit 16, a specific code ROM 17, an output control circuit 18, and a pulse counter 19.

When the power switching circuit 12 operates, the reset circuit 13 operates and the specific code ROM 17 is activated.
At the same time, the oscillation circuit 14 operates and outputs a rectangular wave signal for carrier of 30 to 50 KHz to the circuit 1.
5 and is output to the frequency divider circuit 16.

The output circuit 15 operates the light emitting element 10 based on the input carrier rectangular wave signal. On the other hand, the frequency dividing circuit 16
divides the input carrier rectangular wave signal by several steps (1/16~
1/32) and outputs the frequency-divided signal to the specific code ROM 17. The specific code ROM 17 is operated by the frequency division signal to output a preset serial pulse train specific code signal, and pulses the operation signal output from the output circuit 15 to the light emitting element 10 via the output controller 18 with the specific code repetition signal. Modulate. At this time, the light emitting diode 11 lights up to indicate that the specific code signal is being output from the light emitting element 10.

Further, the output of the specific code ROM 17 is input to the pulse counter 19. Pulse counter 19
When the specific code repetition signal is counted n times, it outputs a signal to the power switching circuit 12. The power switching circuit 12 thereby stops operating.

Figure 7 shows the controller 20 installed on the vehicle body side.
The circuit diagram is shown.

The controller 20 includes a switching power supply circuit 21 that operates when the unlock detection switch means 5 detects a key unlock (unlock operation) (when turned on), and a light receiving element 3 that receives input (reception).
The specified code signal is compared with a preset code signal, and when they match, a match signal (H
When there is no matching signal from the specific code discriminating means 22 and only the unlock detection switch means 5 outputs (turns on) a picking signal is output. Picking signal output means 2
It is composed of 3.

The specific code discrimination means 22 includes a receiving circuit (consisting of a tuning circuit 24, a carrier amplifier circuit 25, and a detection circuit 26) that amplifies and detects the specific code signal inputted by the light receiving element 3, and a specific code discrimination circuit 27. ing.

Further, the picking signal output means 23 is a power-on signal operated by the switching power supply circuit 21.
A reset circuit 28, an output latch circuit 29 whose Q output becomes L level when reset by the power-on reset circuit 28, and an AND circuit 30.
It is composed of a NOR circuit 31, an alarm latch circuit 32, and an inverter 33.

In the controller 20, when the unlock detection switch means 5 is turned on, the receiving circuit is set to a standby state, the power-on reset circuit 28 is operated, the output latch circuit 29 is reset, and the Q output becomes L level. Further, the output terminal of the AND circuit 30 becomes L because one input terminal connected to the Q output of the output latch circuit 29 is L, and the other input terminal connected to the unlock detection switch means 5 is L. Also, the output terminal of the NOR circuit 31 is high because both input terminals are low.
becomes. As a result, the Q output set by the alarm latch circuit 32 is latched at the H level, and the switching power supply circuit 21 is maintained in the operating state even if the unlock detection switch means 5 is turned off by the inverter 33.

In this state, when a specific code signal is output from the light emitting element 10, the light receiving element 3 inputs this specific code signal, which is amplified and detected by the tuning circuit 24, carrier amplification circuit 25, and detection circuit 26, and is then output to the specific code discrimination circuit. Output to 27. Then, the specific code discrimination circuit 27 compares the specific code signal with a preset code signal, and if the specific code signal matches the preset code signal, a pulse signal of H level is output for a certain period of time. As a result, the output latch circuit 2
9 becomes set state and Q output changes from L level to H level.
level, the alarm latch circuit 32 is reset, and the Q output of the alarm latch circuit 32 becomes L. Therefore, no picking signal is output to an alarm device (not shown).

When the specific code discrimination circuit 27 does not output an H level pulse signal for a certain period of time, that is, when only the unlock detection switch means 5 outputs, the Q output of the alarm latch circuit 32 is H and a picking signal is output to the alarm device. .

Note that the output terminal of the AND circuit 30 and the NOR circuit 3
A delay circuit 34 is provided between the unlock detection switch means 5 and one input terminal of the unlock detection switch means 5 to adjust the time lag between when the unlock detection switch means 5 is triggered and when the normal unlock condition is established.

In the above embodiment, one light emitting element 10 is arranged, but in the reversible key, two light emitting elements 10 are arranged as shown in FIG.

Further, as shown in FIG. 9, a switch means 8 is turned on only while the key is inserted into the key cylinder device 1.
You may also use a key 6 equipped with. in this case,
When the key 6 is inserted into the key cylinder device 1, the key cylinder operation surface 1a that comes into contact with the operating rod 8a of the switch means 8 becomes a switch-on means.

〔Effect of the invention〕

According to the structure of the present invention, even if the key cylinder rotates to the unlocked position and the door lock becomes unlocked, it is possible that the key cylinder is rotated to the unlocked position and the door lock is unlocked. If the door is unlocked due to an operation that does not involve the use of a normal key, the alarm device can be activated when the door is opened.

The configuration of the present invention has the effect of countering unauthorized unlocking due to picking, and since the comparison of specific codes is performed by optical means, it is possible to prevent interception of signals related to specific codes and interference with external magnetism and external radio waves. It has advantages that you would not otherwise receive.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of a key cylinder device, FIGS. 2 and 3 are perspective views of the key cylinder device, and FIGS. 4 and 5 are internal views of the key. 6 is a circuit diagram of the key side, FIG. 7 is a circuit diagram of the controller, FIG. 8 is a side view of another embodiment of the key, and FIG. 9 is a further embodiment of the key. It is a sectional view showing an example. 1... Key cylinder device, 3... Light receiving element, 1
a, 4... Switch on means (4... Magnet, 1a... Key cylinder operation surface), 5... Unlock detection switch means, 8... Switch means,
9... Code generating means, 10... Light emitting element, 20
... Controller, 22 ... Specific code discrimination means, 23 ... Picking signal output means.

Claims (1)

[Scope of Claims] 1. An anti-theft device for a locking device in which a door lock is released by rotating a key cylinder device to an unlocking operation position, comprising: an unlocking detection switch means for detecting an unlocking position of a key; , a key cylinder device having a light-receiving element disposed in the front part of the key cylinder, and a switch-on means for turning on the switch means of the key at an unlocking operation position; and a switch turned on by the switch-on means of the key cylinder device. means for generating a specific code of a key which outputs a preset specific code signal when the switch means is turned on; a key having a light-emitting element outputting to a light-receiving element; and a specific code determining means for comparing a specific code signal input by the light-receiving element from the light-emitting element with a preset code signal and outputting a matching signal when they match. A theft prevention device for a locking device, comprising: a picking signal outputting means which outputs a picking signal when the unlocking detection switch means outputs a picking signal when the specific code discriminating means outputs no output.