JPS6255195B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-theft device, and more particularly to the structure of a flexible strip that is included in such an anti-theft device and has an optical fiber inserted therein.

Conventionally, as a theft prevention device for a vehicle, especially a motorcycle, one end side of a flexible strip through which an optical fiber and a conductive wire are inserted is used as a theft prevention device (the motorcycle).
and the other end is connected to a predetermined locking member (for example, a utility pole), and furthermore, one end of the optical fiber is provided with a transmitting means (light-emitting element), and the other end is provided with a receiving means (light-receiving element). The anti-theft device is configured to photoelectrically detect the cutting of the flexible strip based on signals exchanged between the receiving means and the transmitting means via the conductive wire and issue an alarm. has been proposed by the applicant (for example, Japanese Patent Application No. 161844/1983).

In this case, as described in the above specification, the flexible strip incorporating optical fibers can withstand harsh use so that the anti-theft object is firmly connected to the locking member. It is desired that the material has sufficient strength and that it can be provided at low cost. Further, the optical fiber of the flexible strip must be incorporated in order to reduce the amount of light attenuation thereof, and furthermore, to prevent a decrease in light transmission efficiency.

The present invention was made in response to the above-mentioned demands, and provides a flexible wire (hereinafter referred to as a lock wire).
a first strip body in which at least one conductive wire coated with an optical fiber and an insulator is inserted into the flexible tube in an axial direction substantially parallel to each other; and a first strip body with the first strip body as an axis. and a second strip body including a reinforcing member wound so as to be in direct contact with the outer periphery of the first strip body, and each reinforcing member is formed of a plurality of strands each made of a plurality of twisted steel wires. To provide a lock wire for an anti-theft device, which has a small outer diameter, is hard to damage an optical fiber, is low-cost, reduces the amount of light attenuation of the optical fiber, and prevents a decrease in light transmission efficiency. It is something.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of the electrical system of an anti-theft device to which the lock wire of the present invention is applied.

Reference numeral 1 indicates a light emitting element (e.g., a light emitting diode) disposed at one end of an optical fiber 21 inserted into a lock wire 2 (described in detail later), and a light receiving element (e.g., a phototransistor) 3 is disposed at the other end of the optical fiber 21. It is arranged. The light emitting element 1 and the light receiving element 3 are electrically connected to an electric circuit 4, respectively. The electric circuit 4 drives the light-emitting element 1 and the light-receiving element 3 and also generates an alarm signal according to the output of the light-receiving element 3. An alarm 5 is connected to the output side of the electric circuit 4. are connected to a power source 6 so that power is supplied to each of them. Incidentally, lead wires 22, 22' connecting the light receiving element 3 and the electric circuit 4 are wound inside the lock wire 2 of the present invention, which will be described later.

The electric circuit 4 includes a transmitter circuit 4a, a receiver circuit 4b, a disconnection detection circuit 4c, and a drive circuit 4d. The transmitter circuit 4a is, for example, a pulse oscillation circuit and outputs a pulse signal Pa of a predetermined period. The light emitting element 1 converts an electrical signal into a corresponding optical signal, operates in response to a pulse signal Pa, and emits an optical pulse signal Ph. This optical pulse signal Ph is transmitted through the optical fiber 21
transmitted inside. The light receiving element 3 converts an optical signal into a corresponding electric signal, and outputs an electric pulse signal Pb corresponding to the optical pulse signal Ph input from the optical fiber 21. The receiving circuit 4b includes the light receiving element 3
It receives and detects the signal Pb from and outputs the corresponding pulse signal Pc. The disconnection detection circuit 4c receives pulse signals output from the transmitting circuit 4a and the receiving circuit 4b.
It detects a break in the optical fiber 21 using Pa and Pc. For example, an AND condition is taken between the signals Pa and Pc, and if the condition is satisfied, it is determined to be normal, and if not, it is determined to be abnormal. It is designed to output an abnormal signal Pb. Drive circuit 4
d is for activating the alarm 5, and outputs a drive signal Ps according to the input signal Pb. Alarm 5
For example, a buzzer is activated in response to the drive signal Ps to generate an alarm.

FIG. 2 is an external view of an example of an anti-theft device incorporating the electrical system shown in FIG. 1. The electrical circuit 4, alarm 5, and power source 6 shown in FIG. 1 are incorporated into the housing 7, and the housing 7 is firmly fixed to the side surface of the rear cowl 14 below the seat 13 of the motorcycle shown in FIG. 3, for example. has been done. One end 2a of lock wire 2
A plug 8 with a light emitting element 1 and a connector mounted therein is fixedly installed, a small loop 2c is formed on the other end 2b side, and the end 2b is firmly fixed to the lock wire 2 by a caulking metal fitting 9. It is caulked to. The light-receiving element 3 shown in FIG. 1 is supported at the end 2b so as to be aligned with the end of the optical fiber 21, and is housed in a capsule (not shown). It is twisted and caulked.

When connecting a vehicle to a utility pole 10, etc., first wind the lock wire 2 around the utility pole 10, then insert the plug 8 into the small loop 2c, and then insert the plug 8 into the small loop 2c.
It is sufficient to attach it to the socket 11 of the housing 7. still,
In Fig. 2, numeral 12 indicates plug 8 and socket 1.
This is a lock to prevent separation from 1.

Next, the lock wire 2 according to the present invention used as described above will be explained based on FIGS. 4 and 5.

FIGS. 4 and 5 show a lock wire 2 according to an embodiment of the present invention, and the lock wire 2 has a shaft core covered with a coating 23 of synthetic resin (for example, polyvinyl chloride, polyethylene, etc.). A first strip body formed by inserting an optical fiber 21 and, for example, two lead wires 22 and 22' as conductive wires into a flexible tube 24 made of, for example, polyethylene substantially parallel to its axial direction. A second strip body consisting of a plurality of (for example, six) strands 25 in which a plurality of (for example, seven) steel wires 26 are twisted is wound so as to be in direct contact with the outer periphery of the first strip. The second strip body functions as a reinforcing member for the first strip body. Note that both lead wires 22 and 22' are each covered with a predetermined insulator in order to avoid mutual electrical contact.

The optical fiber 21 is located at the axial center of the lock wire 2 and is protected by a tube 24, a strand 27, etc., so that it is not easily damaged or cut. Further, as mentioned above, the optical fiber 21 is inserted in a straight line in the axial direction, so that the optical pulse signal shown in FIG. 1 is transmitted through the shortest distance without unnecessary bending.
Ph can be transmitted, and the loss of the optical pulse signal output can be reduced.

Further, the number of lead wires 22, 22' is not limited to two as shown in the illustrated example, and for example, only one lead wire can be used as a positive conductor and the strand 25 can be used as a negative conductor.

The number of strands 25, the number of strands 26, the way of twisting, etc. may be variously selected, and may be arbitrarily selected in consideration of the outer diameter, strength, etc. of the lock wire 2.

As described above, according to the present invention, one end side of the flexible strip through which the optical fiber and the conductive wire are inserted is connected to the anti-theft object, and the other end side is locked to a predetermined locking member, Furthermore, by providing a transmitting means at one end of the optical fiber and a receiving means at the other end, the flexible strip can be adjusted based on the signal exchanged between the receiving means and the transmitting means via the conductive wire. In an anti-theft device configured to photoelectrically detect cutting of a body and issue an alarm, the optical fiber and at least one conductive wire covered with an insulator are arranged in a flexible tube in an axial direction. a first strip body inserted substantially parallel to each other;
the first strip body and a second strip body including a reinforcing member that is wound directly around the outer periphery of the first strip body with the first strip body as the axis, and each of the reinforcing members is made of a plurality of steel wires. Since the structure is made up of a plurality of twisted strands, the first and second strips are in direct contact with each other for a strong binding, and the theft prevention object is firmly tied to the locking member. In order to protect the optical fiber and make it durable, it has sufficient strength and has a simple structure, so it has a small outer diameter and can be manufactured easily and at low cost. Furthermore, since the optical fiber is inserted linearly in the axial direction of the lock wire, the overall length of the optical fiber can be shortened to reduce the amount of light attenuation, and the twisting of the optical fiber can be reduced to prevent a decrease in light transmission efficiency. can do.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the electrical system of an anti-theft device to which the flexible strip of the present invention is applied;
Figure 2 is an external view showing an example of the use of flexible strips;
The figure shows an external view of an example equipped with an anti-theft device.
FIG. 4 shows a cross-sectional view of the flexible strip, and FIG. 5 shows a cutaway side view of the flexible strip. DESCRIPTION OF SYMBOLS 1... Light emitting element (transmission means), 2... Lock wire (flexible strip), 3... Light receiving element (receiving means), 5...
Alarm device, 7... Housing (object to be stolen), 10... Telephone pole (locking member), 21... Optical fiber (first strip body), 2
2, 22'... Lead wire (first strip body), 24... Flexible tube, 25... Strand (second strip body).

Claims (1)

[Claims] 1. One end side of the flexible strip through which the optical fiber and the conductive wire are inserted is connected to the anti-theft object, and the other end side is locked to a predetermined locking member, and
By providing a transmitting means at one end of the optical fiber and a receiving means at the other end, the flexible strip can be activated based on a signal exchanged between the receiving means and the transmitting means via the conductive wire. In an anti-theft device configured to photoelectrically detect a disconnection and issue an alarm, the optical fiber and at least one conductive wire covered with an insulator are arranged in a flexible tube axially approximately relative to each other. It consists of a first strip that is inserted in parallel, and a second strip that includes a reinforcing member that is wound around the first strip so as to be in direct contact with the outer periphery of the first strip. 1. A flexible strip for an anti-theft device, characterized in that the reinforcing member is formed of a plurality of strands, each of which is formed by twisting a plurality of steel wires.