JPH0129675Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention relates to a product case with a sensor, and in particular, a case with a sensor that is equipped with a resonant circuit as a sensor consisting of a coil and a capacitor, and is suitable for use in a product theft prevention system, etc. Regarding improvements to product cases.

[Prior art and its problems]

In recent years, a product theft prevention system has been proposed for preventing products from being illegally taken out of a predetermined area, such as a supermarket counter in a general store.

That is, in this product theft prevention system, for example, as shown in FIG.
is arranged to face the transmitting antenna 2 at a predetermined interval, and a receiver 4 is connected to the receiving antenna 3. When a sensor-equipped product case 5 equipped with a circuit and containing a predetermined product passes, the receiver 4
The passage of the product case 5 with the sensor is detected by detecting and displaying the resonance circuit.

As shown in FIGS. 2 and 3, the sensor-equipped product case 5 used in such a product theft prevention system has a step on the outer periphery of the frame 7 of the box-shaped product case body 6 made of plastic. A conductive wire 9 is wound around the stepped portion 8 in a frame shape to form a coil 10, a capacitor 11 is connected to both ends of the coil 10, and the capacitor 11 is attached to the product case body using adhesive. It was constructed by forming a resonant circuit as a sensor with a resonant frequency of .

4A is a circuit diagram showing the resonant circuit 14 formed in the product case body 6, and FIG. 4B is an equivalent circuit diagram of the resonant circuit 14.

However, as shown in FIG. 2, in the conventional sensor-equipped product case 5 configured as described above, the conductors at both ends of the coil 10 are wound around the lead 13 of the capacitor 11 and soldered, and then the capacitor storage recess 12 is closed. Since it is fixed with adhesive,
Due to changes over time, the adhesive peeled off, causing the problem that the capacitor would float away from the product case itself. Furthermore, since adhesive is used, it takes time and effort to apply and dry the adhesive.

[Purpose of invention]

The present invention was made to solve these conventional drawbacks, and aims to provide a product case with a sensor that has excellent durability over time and is easy to manufacture.

[Structure and effect of the idea]

In order to achieve this object, the present invention includes a product case body made of an insulator and having at least a frame portion for storing the product, a coil formed by winding a conductive wire around the frame portion of the product case body, and a coil formed by winding a conductive wire around the frame portion of the product case body. A sensor-equipped product case comprising a capacitor connected to both ends of the coil to form a resonant circuit with the coil, the capacitor being located in a recess provided on the outer surface of the frame, and the conductor of the coil passing over the capacitor. It is a structure formed to pass through.

According to the configuration of the present invention, not only does the problem of the capacitor floating from the product case body disappear, but also there is no need to use adhesive, and manufacturing is simple.

[Example of idea]

The details of the idea will be explained below. Note that parts common to the conventional example are given the same reference numerals.

FIGS. 5, 6, and 7 are a perspective view, a sectional view, and a perspective view of a soldered square chip capacitor showing an embodiment of the sensor-equipped product case of the present invention.

In Figures 5 and 6, the product case body 6
It is made of plastic molded into a box shape, and has a shape that can accommodate a specified product.

Around the outer periphery of the frame 7 of this product case body 6,
A winding groove 15 is formed, and a conductive wire 9 is wound a predetermined number of turns in this winding groove 15 to form a coil 10.

A recess 12 for accommodating a capacitor is formed at one location on the outer surface of the frame 7 so as to overlap the winding groove 15. Further, the depth of the concave portion 12 for storing the capacitor is made deeper than the winding groove 15, and the depth is approximately equal to the thickness of the rectangular chip capacitor 16.

As shown in FIG. 7, in the square chip capacitor 16,
Solder the conductive wire 9 whose tip has been bent in advance,
A capacitor 16 with a conducting wire is hooked onto the recess 12 and winding is started, so that the conducting wire passes over the capacitor 16 each time the outer periphery of the frame of the product case body 6 is wound once.

Taking advantage of the fact that the depth of the capacitor housing recess 12 is deeper than the winding groove 15, the finished wire is passed through the capacitor 16 while being pulled under the wire, and is soldered to the other end of the capacitor 16.

At this time, the conducting wire that is pulled and passed under the conducting wire is wedged between the previously wound conducting wire and the winding groove 15.

Moreover, in order to strengthen this pinching force, the capacitor storage recess 12 is moved toward the edge of the outer surface of the frame.

Therefore, the end of the winding of the conductive wire is sufficiently fixed without loosening until it is soldered to the capacitor.
This state is shown in an enlarged view in FIG.

In this way, the conductor prevents the capacitor from floating, does not require adhesive to fix the capacitor to the product case body, and furthermore, manufacturing becomes very simple.

Although the product case with a sensor of the present invention described above uses a rectangular chip capacitor as the capacitor, it may also be a conventional disc-shaped capacitor with leads, and the depth of the recess for storing the capacitor may also be changed.
There is no need to make it deeper than the winding groove. Preferably, the conductor is selected within a range where the conductor does not protrude from the back surface of the frame even if the conductor passes over the capacitor.

The sensor-equipped product case of the present invention is suitable for use with relatively small products such as cassette tapes, books, other stationery, and miscellaneous goods.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an outline of a product theft prevention system, Figures 2 and 3 are perspective views and cross-sectional views of a conventional product case with a sensor, and Figure 4 shows a resonant circuit of the product case with a sensor. The circuit diagram and equivalent circuit diagram, FIGS. 5, 6, and 7 are a perspective view and a cross-sectional view showing an embodiment of the product case with a sensor of the present invention, and a diagram showing the case in which conductive wires are soldered in advance to a rectangular chip capacitor. The perspective view, FIG. 8, is an enlarged view of the capacitor housing shown in FIG. 5. 5... Product case with sensor, 6... Product case body, 7... Frame, 8... Step, 9... Conductor, 10... Coil, 11... Capacitor, 12
...Recess for storing capacitor, 13... Capacitor lead, 14... Resonance circuit, 15... Winding groove, 1
6... Square chip capacitor.

Claims (1)

[Scope of utility model registration request] A product case body made of an insulator that has at least a frame portion and stores the product; a coil formed by winding a conductive wire around the frame portion of the product case body; and a coil connected to both ends of the coil to form a resonant circuit with the coil. A product case with a sensor comprising a capacitor formed therein, wherein the capacitor is located in a recess provided on an outer surface of the frame, and a conductive wire of the coil passes over the capacitor.