JPH0420511B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an anti-theft device that photoelectrically detects the breakage of a flexible strip (lock wire) incorporating optical fibers and conductive wires and issues an alarm. The present invention relates to the flexible strip body.

(Prior Art and its Problems) Conventionally, in vehicles, particularly motorcycles, when the vehicle is parked, an immovable structure such as a utility pole and the vehicle are connected by a flexible strip body incorporating optical fibers and conductive wires inside. When an optical signal from the light emitting element is input to the light receiving element via the optical fiber, and the optical signal from the light emitting element is no longer input to the light receiving element due to the flexible strip being cut. An anti-theft device that photoelectrically detects the cutting of the flexible strip and activates an alarm is known as disclosed in Japanese Patent Application Laid-open No. 1983-62791 filed by the present applicant. .

The flexible strip used in such a conventional anti-theft device has a first layer in which an optical fiber coated with a synthetic resin film is arranged along the axis in the center thereof; Two conductive wires are twisted and wound around the outer periphery of the first layer along with a plurality of auxiliary cords having approximately the same diameter as these conductive wires, and the outside of these conductive wires and auxiliary cords is covered with a covering member made of a synthetic resin film. A second layer is formed by a second layer, and a plurality of strands formed by twisting a plurality of steel wires are wound around the outer periphery of the second layer, and the outside of these strands is covered with a coating member made of a synthetic resin film. Consists of the third layer,
The second layer containing the conductive wire was firmly sandwiched between the first layer and the third layer.

When such a flexible strip is wound into a loop for storage, those located on the outer periphery of the wound portion are stretched, and those located on the inner periphery are compressed.

When the outer circumferential side of the winding portion is stretched, it means that it is stretched. However, since the outer circumferential layer does not extend freely, it acts as pressure on the inner circumferential layer of the winding portion, compressing this inner layer.

Therefore, when conductive wires are arranged in this inner layer, since the conductive wires are in a spiral shape, the conductive wires a are placed at intervals of several centimeters on the outer circumferential side, as shown in FIG. There is a part that does. Then, when the strands, which are reinforcing wires arranged on the outer layer, press the vertices P of the plurality of parts located on the outer circumferential side, the conductive wire a between the points P and P points,
Since the conductive wire a is held down so as not to shift in the axial direction and the twisting direction, it becomes difficult for the conductive wire a to move, and the degree of freedom in the axial direction and the twisting direction becomes extremely low. In this state, when the flexible strip is wound into a loop for storage, the portion of point P of the conductive wire a becomes in the extending direction. However, this P
As mentioned above, the point part is pressed by the strands of the outer layer and is held down so that it cannot move, so a tensile force f acts between points P and P of the conductive wire a, and this tensile force Since f is inversely proportional to the winding radius r of the flexible strip, if the winding radius r is made too small, the conductive wire a will break.

Therefore, with regard to the above-mentioned conventional flexible strip, there is a limit to reducing the winding diameter when the flexible strip is wound into a loop shape and stored.

(Object of the Invention) The present invention has been made in view of the above circumstances, and provides a flexible anti-theft device that can be stored in a compact manner by reducing the winding diameter when it is wound in a loop shape and stored. The purpose is to provide sexual striae.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes a first layer including an optical fiber disposed in the center along the axis, and a first layer disposed on the outer periphery of the first layer. A second layer is provided and includes a reinforcing member, and a third layer is provided around the outer periphery of the second layer and is wound with at least one conductive wire and a plurality of reinforcing wires. That is.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing an example of an electrical system of an anti-theft device to which the flexible strip of the present invention is applied. In the figure, reference numeral 1 denotes a light emitting element (for example, a light emitting diode), which is disposed at one end of an optical fiber 3 inserted through a flexible strip 2 of the present invention, the details of which will be described later, and at the other end of the optical fiber 3. A light receiving element (for example, a phototransistor) 4 is provided. These light emitting element 1 and light receiving element 4 are electrically connected to an electric circuit 5, respectively. The electric circuit 5 drives the light emitting element 1 and the light receiving element 4 and generates an alarm signal according to the output of the light receiving element 4.
An alarm device 6 is connected to its output side. A power source 7 is connected to the electric circuit 5 and the alarm 6. Incidentally, lead wires (conducting wires) 8, ₈₁ connecting the light receiving element 4 and the electric circuit 5 are wound inside the flexible strip 2 of the present invention.

The electric circuit 5 includes a transmitting circuit 5a and a receiving circuit 5.
b, a disconnection detection circuit 5c, and a drive circuit 5d. The transmitting circuit 5a is, for example, a pulse transmitting circuit, and outputs a pulse signal Pa having a predetermined period.
The light emitting element 1 converts an electrical signal into a corresponding optical signal, operates in response to the pulse signal Pa, and emits an optical pulse signal Ph. This optical pulse signal Ph is input to the light receiving element 4 via the optical fiber 3. The light receiving element 4 converts an optical signal into a corresponding electrical signal, and outputs an electrical pulse signal Pb corresponding to the optical pulse signal Ph input from the optical fiber 3. The receiving circuit 5b receives and detects the signal Pb from the light receiving element 4 and outputs a corresponding pulse signal Pb. The disconnection detection circuit 5c detects a disconnection of the optical fiber 3 using the pulse signals Pa and Pc output from the transmitting circuit 5a and the receiving circuit 5b, respectively. If it is satisfied, it is determined to be normal, and if not, it is determined to be abnormal, and when abnormality occurs, an abnormality signal Pd is output. The drive circuit 5d is for operating the alarm 6, and receives an input signal.
Outputs a drive signal Ps according to Pd. The alarm device 6 is, for example, a buzzer, and is activated in response to the drive signal Ps to generate an alarm.

FIG. 4 is an external view of an anti-theft device incorporating the electrical system shown in FIG. and a power source 7, and the housing 9 is firmly fixed at a predetermined position of a vehicle (motorcycle) 10, as shown in FIG. 3, for example.

As shown in FIG. 2, a strong metal connection plug 11 is fitted and fixed to one end 2a of the flexible strip 2 of the present invention, and the light emitting element 1 is mounted inside the plug 11. has been done. A small loop 2c is formed on the other end 2b side of the flexible strip 2, and the other end 2b is firmly caulked to the flexible strip 2 by a caulking fitting 12. . The light receiving element 4 is supported at the other end 2b of the flexible strip 2 so as to be aligned with the end of the optical fiber 3, and is housed in a capsule (not shown). 2b is caulked with a caulking metal fitting 12.

The connection plug 11 and the casing 9 each have a locking means, and once the plug 11 is inserted into the casing 9 and locked, the plug 1 will be locked unless the key is operated.
1 cannot be released.

Incidentally, a connector (none of which is shown) that engages with the connector of the plug 11 is attached to the housing 9, and when the plug 11 is inserted and locked into the housing 9, the electrical circuit 5 and the light emitting The element 1 and the light receiving element 4 are electrically connected to each other.

When connecting the vehicle 10 to a structure 13 such as a telephone pole, first, as shown in FIG. 4, the flexible strip 2 is wound around the structure 13, and then the plug 11 is inserted into the small loop 2c. The plug 11 is attached to the socket of the housing 9 and connected in a lasso style.
After the vehicle 10 is connected in this manner, the connection of the vehicle 10 must be made by cutting the flexible strip 2 with a wire cutter or the like, other than by unlocking the flexible strip 2 by operating the key. It is difficult to release the stoppage, and if the flexible strip 2 is cut, the alarm device 6 is activated to issue an alarm.

In this case, if at least one of the optical fiber 3 and the lead wires 8, ₈₁ inserted into the flexible strip 2 is broken, the disconnection detection circuit 5c will detect an abnormality and issue an alarm. Emitted.

Next, the flexible strip 2 according to the present invention used as described above will be explained based on FIGS. 5 and 6.

FIG. 5 shows a cross section of the flexible strip 2, the center of which is covered with a covering member 14 made of a synthetic resin film (for example, polyvinyl chloride, polyethylene, etc.). The optical fiber 3 is disposed along the axis, and a plurality of optical fibers (for example,
10 pieces) of auxiliary cord 15 are wrapped around the auxiliary cord 1.
5 is covered with a covering member 1 similar to the covering member 14.
For example, two lead wires (conductive wires) _8,81 are attached to the outer peripheral surface of the covering member 16, and a plurality of wires (for example, 10 wires) having approximately the same diameter as these lead wires _8,81 are provided.
The outer side of the lead wires 8, ₈₁ and the reinforcing wire 17 is wrapped around the covering member 14.
It is covered with a covering member 18 similar to the above. The reinforcing wire 17 includes a plurality of (for example, seven) steel wires 1.
It is made by twisting 7 ₁ .

As mentioned above, the optical fiber 3 is inserted in a straight line through 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, the optical fiber 3
are protected by the covering members 14, 16, 18, the auxiliary cord 15, the reinforcing wire 17, etc., and are not easily cut.

Note that the number of lead wires 8 and 8 ₁ is not limited to two as shown in the illustrated example, and for example, one lead wire may be used as long as a current is passed through the reinforcing wire 17. In addition, various choices can be made for the number of reinforcing wires 17, the number of strands ₁₇₁ , the twisting method, etc., but they can be selected arbitrarily taking into consideration the outer diameter, strength, etc. of the flexible strip 2. can.

(Effects of the Invention) As detailed above, the flexible strip of the anti-theft device of the present invention has a first layer including an optical fiber disposed along the axis in the center thereof, and an outer periphery of the first layer. consisting of a second layer disposed on the second layer and including a reinforcing member, and a third layer in which at least one conductive wire and a plurality of reinforcing wires are both wound around the outer periphery of the second layer. It is characterized by:

Therefore, since the conductive wire is substantially located in the outermost layer, when this flexible strip is wound into a loop for storage, the conductive wire is not subjected to the above-mentioned conventional compressive force. There is no force acting on this conductive wire to restrict its movement in the axial direction and twisting direction, and the conductive wire always has a high degree of freedom in the axial direction and twisting direction, so it can be stored easily. Therefore, even if the conductive wire is wound into a small diameter loop, the conductive wire will not break, and compared to conventional methods, the winding diameter when winding a flexible strip in a loop shape can be reduced, making it easier to store. The state can be made compact.

In addition, since the distance between the optical fiber and the conductive wire in the radial direction is wider than in the case of a two-layer structure, the conductive wire can be easily connected to the light emitting element and the light receiving element without interfering with the optical axis of the optical fiber. I can do it.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram showing the electrical system of an anti-theft device to which the flexible strip of the present invention is applied, and FIG. 2 is a front view of the flexible strip. , Fig. 3 is a side view of a motorcycle equipped with an anti-theft device, Fig. 4 is a perspective view of the anti-theft device, and Fig. 5 is a side view of a motorcycle equipped with an anti-theft device.
The figure is a cross-sectional view of the flexible strip, FIG. 6 is an exploded view of the same, and FIG. 7 is a diagram for explaining problems with the conventional flexible strip. 2... Flexible strip, 3... Optical fiber, 8,8
₁ ... Lead wire (conductive wire), 14, 16, 18...
Covering member, 15... Auxiliary cord (reinforcing member), 1
7...Reinforcement line.

Claims (1)

[Claims] 1. In an anti-theft device that photoelectrically detects cutting of a flexible strip that incorporates optical fibers and conductive wires and issues an alarm, the flexible strip has a central portion along its axis. a first layer including an optical fiber disposed along the outer periphery of the first layer; a second layer disposed on the outer periphery of the first layer and including a reinforcing member; and a second layer disposed on the outer periphery of the second layer and including at least one conductive wire. A flexible strip for an anti-theft device, comprising a third layer wound with a plurality of reinforcing wires.