JPS6255198B2 - - 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 telephone 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 theft prevention device is configured to photoelectrically detect the cutting of the flexible strip based on the signal transmitted and received 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 the optical fiber is caused by external and internal factors so that the anti-theft object is firmly connected to the locking member. It is desirable that the material be hard to be damaged by water, have sufficient strength to withstand severe use, and be available at a 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 including an optical fiber arranged along the axial direction in the axial core portion; and a second strip body arranged around the outer periphery of the first strip body and formed by winding at least one of the conductive wires in a coil shape. and a third strip body including a reinforcing member formed of a plurality of strands, each of which is formed by twisting a plurality of steel wires, and arranged on the outer periphery of the second strip body via an insulator. It is characterized by reducing the optical attenuation of the optical fiber and preventing a decrease in light transmission efficiency.
Further, the present invention provides a locking wire for an anti-theft device that protects an optical fiber and has durability, has sufficient strength, and has an appropriately small outer diameter.

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 Pd. 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, and an optical fiber 21 (first strip) coated with a coating 23 of synthetic resin (for example, polyvinyl chloride, polyethylene, etc.) is disposed at the core of the lock wire 2. On the outer periphery of this first strip, there are two strips as a second strip.
Lead wires 22, 22' (both lead wires are each covered with an insulator such as synthetic resin) are wound into a coil. Further, on the outer periphery of this second strip, a plurality of (for example, ten) steel wires 26 are arranged as a third strip, in which a plurality of (for example, seven) steel wires 26 are twisted through a synthetic resin coating 24 that is an insulator. ) strand 25 is wrapped around the outer periphery of the third strip body, and a synthetic resin (for example, polyvinyl chloride) is used as the outer skin member.
It is coated with a film 27 of.

As mentioned above, the optical fiber 21 is inserted in a straight line in the center, so that the optical pulse signal Ph shown in FIG. 1 can be transmitted through the shortest distance without unnecessary bending, and the optical pulse signal Ph can be output. loss can be reduced. Also, the optical fiber 21 is coated with a coating 2.
3, 24, 27 are protected by strands 25, etc., to prevent them from being easily cut. Furthermore, the lead wires 22, 22' can be easily taken out from the ends of the lock wire 2, making it easy to process the ends.

Further, the number of lead wires 22, 22' is not limited to two as shown in the illustrated example, and for example, one lead wire may be used so that current also flows through the strand 25.

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 theft prevention 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 body can be transmitted and received based on a signal transmitted and received between the receiving means and the transmitting means via the conductive wire. In an anti-theft device that photoelectrically detects the disconnection of
a strip, and at least one strip arranged around the outer circumference of the first strip.
A second strip body formed by winding the conductive wire of the book into a coil shape, and a plurality of strands each made of a plurality of twisted steel wires arranged on the outer periphery of the second strip body with an insulator interposed therebetween. Since the structure is provided with a third strip body including a reinforcing member formed by a lock wire, the object to be anti-theft is configured to be tied to the locking member, and an optical fiber is disposed in the center of the lock wire along the axis. Therefore, the total length of the optical fiber can be shortened to reduce the amount of light attenuation, and the twist of the optical fiber can be eliminated to prevent a decrease in light transmission efficiency.
In addition, it protects the optical fiber, makes it durable, has sufficient strength, and allows the outer diameter to be appropriately reduced. Furthermore, terminal treatment of the conductive wire is also easy.

[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 in which the anti-theft device is mounted, FIG. 4 shows a 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, 21... Optical fiber (first strip body), 22,
22'...Lead wire (second strip body), 24...Synthetic resin coating (insulator), 25...Strand (third 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. An anti-theft device that photoelectrically detects disconnection and issues an alarm includes a first strip body including an optical fiber disposed along the axial direction in the shaft center portion, and a first strip body disposed on the outer periphery of the first strip body. a second strip body formed by winding at least one of the conductive wires into a coil shape, and a plurality of wires arranged around the outer periphery of the second strip body with an insulator interposed therebetween, each consisting of a plurality of steel wires twisted together. A flexible strip for an anti-theft device, characterized in that the third strip includes a reinforcing member formed of a strand of.