JPS6255197B2 - - 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 desirable that the material has sufficient strength and can be provided at low cost.
In addition, the optical fiber of the flexible strip must be incorporated in order to reduce the amount of light attenuation and thereby prevent a decrease in light transmission efficiency, and the storage space and external shape of the vehicle must be appropriately reduced. It is desirable to make it small.

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 optical fibers are arranged along the axial direction at the shaft core and coated with synthetic resin, and a large number of thin wires made of a good conductor arranged around the outer periphery of the first strip body are twisted in parallel and finely. The structure is made up of a second strip body, which is arranged on the outer periphery of the second strip body, and a third strip body that includes a reinforcing member. The reinforcing member and the thin wire covered with the insulator are respectively conductive wires, and have a suitably small outer diameter.
Furthermore, it is an object of the present invention to provide a lock wire for an anti-theft device that reduces the amount of optical attenuation of the optical fiber and prevents a decrease in light transmission efficiency.

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 device 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.

4 and 5 show the lock wire 2, and the optical fiber 21 (first strip) is coated with a coating 23 of synthetic resin (for example, polyvinyl chloride, polyethylene, etc.) as a protective member on the shaft core of the lock wire 2. are arranged along the axial direction, and on the outer surface of the coating 23, a parallel stranded wire made of, for example, a large number of thin copper wires finely twisted in parallel is wound as the lead wire 22 (second strip). . A synthetic resin film 24 is formed on the outer periphery of this lead wire 22, and a plurality of (for example, 7
A plurality of twisted steel wires 22'a (for example, 10
The strand 22' (third strip body) as the conductor of the book) is wound, and the strand 22'
The outer periphery of 2' is covered with a synthetic resin (for example, polyvinyl chloride) coating as an outer skin member.

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.

Further, since the strand 22' is used as the lead wire 22' in FIG. 1 as described above, only one parallel twisted wire is required and the outer diameter of the lock wire 2 can be made small.

Further, the optical fiber 21 is protected by coatings 23, 24, 25, strands 22', etc., so that it will not be easily cut.

In addition, the number of strands 22', the number of strands 22'a,
Various methods of twisting can be considered, but any method can be selected in consideration of the outer diameter, strength, etc. of the lock wire 2.

According to the present invention, one end side of a flexible strip through which an optical fiber and a conductive wire are inserted is connected to an object to be anti-theft, and the other end side is connected to a predetermined locking member, and further, the optical fiber is connected to a predetermined locking member. By providing a transmitting means at one end and a receiving means at the other end, the cutting of the flexible strip can be performed photoelectrically based on signals transmitted and received between the receiving means and the transmitting means via the conductive wire. An anti-theft device configured to detect a vehicle and issue an alarm, the first strip body being arranged along the axial direction in the shaft core portion and having the optical fiber coated with a synthetic resin, and the first strip body. A second strip body is arranged around the outer periphery of the reinforcing member, and a third strip body is arranged around the outer periphery of the second strip body and includes a reinforcing member, and a third strip body is arranged around the outer periphery of the second strip body and includes a reinforcing member. The member is formed of a plurality of strands each made by twisting a plurality of steel wires, and the reinforcing member and the thin wire covered with an insulator are each used as the conductive wire, so that the flexible A predetermined strength can be obtained by forming the body in a multiple coaxial shape with three types of stripes, while the second stripe and third stripe each function as a conductive wire for reliable signal transmission and reception. The outer diameter can be made appropriately thinner, and since the optical fiber is arranged along the axis at the center of the lock wire, the total length of the optical fiber can be shortened, reducing the amount of light attenuation, and the twisting of the optical fiber can be reduced. By eliminating this, it is possible to prevent a decrease in light transmission efficiency.

Furthermore, since the optical fiber is placed in the center, it is less likely to be damaged and has high durability.

[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 showing an example of mounting 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, 21... Optical fiber (first strip body), 22...
Parallel twisted wire (second strand body), 22'... Strand (third strand body), 25... Synthetic resin coating (insulator).

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 disconnection and issue an alarm, the first strip body includes a first strip body in which the optical fiber is disposed along the axial direction at the shaft core portion and is coated with a synthetic resin; It consists of a second strip body, which is arranged around the outer periphery of the first strip body and has a large number of thin wires made of a good conductor twisted in parallel and finely, and a third strip body, which includes a reinforcing member, arranged around the outer periphery of the second strip body. , the reinforcing member is formed of a plurality of strands each made of a plurality of twisted steel wires, and the reinforcing member and the thin wire coated with an insulator are each used as the conductive wire. Flexible striations of the prevention device.