JP2008152371A - Alarm device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm device with a body and a cover constituting a housing, coupled to each other by a novel means. <P>SOLUTION: The housing 1 comprises the body 11 comprising a synthetic resin molding and provided with a storage recess 10, and the cover 12 comprising a synthetic resin molding and coupled to the body 11 to close the storage recess 10. A fusing conductive wire 4 is sandwiched between the body 11 and the cover 12. The fusing conductive wire 4 is electrified when coupling the body 11 to the cover 12 in production. A thermoplastic resin constituting the body 11 and the cover 12 is fused therein by Joule heat generated in the fusing conductive wire 4, and the fused thermoplastic resin is hardened after stopping the electrification to the fusing conductive wire 4, to cause the body 11 and the cover 12 to fuse-couple to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an alarm device that detects and notifies an abnormality.

  Conventionally, an alarm device including an abnormality detection circuit that detects an abnormality and a transmission circuit as a notification circuit that transmits a wireless signal that notifies the abnormality when the abnormality is detected by the abnormality detection circuit is provided. This type of alarm device is used together with a notification device that is carried by a user to receive the wireless signal and generate an alarm sound. As a wireless signal medium, for example, radio waves such as low-power radio and weak radio are used. Further, as the alarm device, in place of the transmission circuit or in addition to the transmission circuit, the alarm device includes a notification circuit that has a buzzer or a light emitting diode and notifies abnormality by sound or light, and uses the notification device as described above. Some can be used as a single alarm device.

  Examples of the abnormality detected by the abnormality detection circuit include breakage of the window glass and open state of the window. As an alarm device for detecting breakage of a window glass, as an abnormality detection circuit, for example, as shown in FIG. 4A, a filter circuit that separates frequency components related to breakage of the window glass from the outputs of the piezoelectric ceramic PC and the piezoelectric ceramic PC ( (Not shown), and is attached to the window glass so that the vibration of the window glass is transmitted to the piezoelectric ceramic PC and detects the breakage of the window glass based on the output of the filter circuit. As an alarm device for detecting the opening of the window, as shown in FIG. 4B, the abnormality detection circuit has a reed switch RS whose contact is opened and closed according to the distance from a permanent magnet (not shown). Along with the permanent magnet (not shown) attached to one of the two places where the distance changes with the opening and closing of the window, it is attached to the other of the two places and used based on the contact state of the reed switch RS. Some of them detect the opening of windows. Further, an alarm device provided with both of the two types of abnormality detection circuits is also provided.

  As shown in FIGS. 5A and 5B, the housing 1 that houses the printed wiring board 2 on which the abnormality detection circuit and the transmission circuit are mounted and the battery 3 that serves as a power source for the abnormality detection circuit and the transmission circuit are housed. The body 11 is provided with a recess 10, and the cover 12 is mechanically coupled to the body 11 and forms a space in which the printed wiring board 2 and the battery 3 are stored between the inner surface of the storage recess 10. Things are common. In the example of FIGS. 5A and 5B, a buzzer BZ that is driven and rings when an abnormality is detected by the abnormality detection circuit is attached to the cover 12.

  As a method of connecting the body 11 and the cover 12 to each other, conventionally, a plurality (six in the figure) of screw insertion holes 11d are formed in the body 11 and the cover 12 is provided with the same number of screw holes 12d. The body 11 and the cover 12 are screwed together by screws (not shown) that are inserted into the screw insertion holes 11d and screwed into the screw holes 12d of the cover 12 (for example, Patent Document 1). reference).

Also, the alarm device is required to be waterproof, for example, when it is attached to a window, so that condensed water does not enter the window, and when it is installed outdoors, raindrops do not enter it. Many. Therefore, in the example of FIGS. 5A and 5B, a ring-shaped waterproof groove 11e surrounding the housing recess 10 is provided in the body 11, and the ring-shaped packing made of a flexible material such as elastomer is provided in the waterproof groove 11e. 6 is housed, and as shown in FIG. 6, a ring-shaped waterproof protrusion 12e that is inserted into the waterproof groove 11e and sandwiches the packing with the bottom surface of the waterproof groove 11e is provided on the cover. That is, the gap between the body 11 and the cover 12 is closed by the packing 6 crushed between the inner surface of the waterproof groove 11e and the waterproof protrusion 12e, and the waterproof property is ensured.
Registered Utility Model No. 3108993

  The alarm device is often required to be miniaturized so that it does not obstruct the opening and closing of the attached window, particularly if it is attached to the window so as to be as inconspicuous as possible. However, in the conventional alarm device described above, the housing has been enlarged due to the need to provide a screw insertion hole or a screw hole. In addition, since slip occurs between the body 11 and the cover 12, mechanical strength is required for each of the body 11 and the cover 12, making it difficult to reduce the thickness.

  As a means for coupling the body 11 and the cover 12 to each other, ultrasonic bonding or an adhesive can be considered in addition to screwing. However, when ultrasonic bonding is used, vibration at the time of bonding is a circuit component of an abnormality detection circuit or a transmission circuit. In general, an adhesive requires a long time for bonding because it needs to be allowed to stand until it is sufficiently cured after bonding.

  The present invention has been made in view of the above reasons, and an object thereof is to provide an alarm device in which a body and a cover constituting a housing are coupled to each other by a novel means.

  The invention of claim 1 includes a housing, a battery accommodated in the housing, an abnormality detection circuit that outputs an abnormality detection signal when an abnormality is detected using the battery as a power source, and the abnormality detection circuit detects abnormality. A notification circuit that notifies an abnormality when a signal is output, and the housing is provided with a body provided with a storage recess, and mechanically coupled to the body to close the storage recess, and a battery, an abnormality detection circuit, and a notification circuit; Is formed between the inner surface of the housing recess and the cover and the body are fused to each other at the opening edge of the housing recess.

  According to the present invention, since the gap between the cover and the body is closed at the fused portion and the intrusion of the liquid droplets into the storage recess is suppressed, the waterproof property is improved. In addition, compared to the case where the body and the cover are coupled to each other by screwing, the sliding between the body and the cover is less likely to occur, so the rigidity of the entire housing is improved and the mechanical strength required for the body and the cover is increased. Since it becomes low, the housing can be made thin. Further, the heat at the time of fusion is less likely to damage the circuit components of the abnormality detection circuit and the notification circuit, compared to the vibration in the case where ultrasonic bonding is used to bond the body and the cover. Further, the body and the cover can be coupled in a short time compared to the case where an adhesive is used for coupling the body and the cover. Further, when recovering resources after disposal, the body and the cover can be easily separated by reheating the fused part as compared with the case of ultrasonic bonding or adhesive.

  According to a second aspect of the present invention, in the first aspect of the present invention, the body and the cover are each made of a thermoplastic resin, are each made of a conductive material, and are sandwiched between the body and the cover to bond the body and the cover to each other at the time of manufacture. It is characterized by comprising at least one fusion conductive wire that is energized when the body and the cover are fused together by Joule heat.

  According to this invention, compared with the case where the cover and the body are fused together by heating to the outer surface of the housing, the appearance can be improved with the fused portion as the inside of the housing.

  The invention of claim 3 is the invention of claim 2, wherein the number of conductive wires to be fused is one, and a part of the ring shape surrounding the opening of the housing recess is missing, and the length of this missing part Is characterized in that it is short enough to allow the molten thermoplastic resin to spread throughout the fusion of the body and the cover.

  According to this invention, since the molten thermoplastic resin flows into the portion lacking the ring shape, the cover and the body can be fused together over the entire circumference of the storage recess.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, there is only one conductive wire to be fused, and a part of the ring shape surrounding the opening of the storage concave portion is missing. It is characterized by comprising a closing body that closes the gap between the cover and the body in at least a part of the portion around the opening where the fusion conductive wire is not disposed.

  According to the present invention, the gap between the cover and the body is closed by the closing body at the portion where the conductive wire to be welded is missing and the cover and the body are not fused, so that compared with the case where the closing body is not provided. Waterproofness is improved.

  In the invention of claim 1, since the body and the cover are bonded to each other by fusion, the gap between the cover and the body is closed at the fused portion, and the intrusion of liquid droplets into the storage recess is suppressed. Therefore, waterproofness is improved. In addition, compared to the case where the body and the cover are connected to each other by screwing, the sliding between the body and the cover is less likely to occur, thereby improving the rigidity of the entire housing and the mechanical requirements of the body and the cover. Since the strength is low, the housing can be thinned. Further, the heat at the time of fusion is less likely to damage the circuit components of the abnormality detection circuit and the notification circuit, compared to the vibration in the case where ultrasonic bonding is used to bond the body and the cover. Further, the body and the cover can be coupled in a short time compared to the case where an adhesive is used for coupling the body and the cover. Further, when recovering resources after disposal, the body and the cover can be easily separated by reheating the fused part as compared with the case of ultrasonic bonding or adhesive.

  In the invention of claim 2, since the body and the cover are fused to each other by the Joule heat generated by the fused conductive wire, the fused portion is compared with the case where the cover and the body are fused to each other by heating to the outer surface of the housing. The appearance can be improved as the inside of the housing.

  The invention according to claim 3 is that the heating range in the fusion conductive wire, that is, the body and the cover, is a shape in which a part of the ring shape surrounding the opening of the housing recess is missing, so that the part lacking the ring shape is melted. Since the thermoplastic resin thus flowed in, the cover and the body can be fused together over the entire circumference of the storage recess. Moreover, manufacturing cost can be reduced compared with the case where a plurality of fusion conductive wires are provided. Furthermore, even when the notification circuit transmits and receives radio waves to and from the outside, the fusion conductive wires are less likely to inhibit the radio waves compared to the case where the fusion conductive wires surround the housing recess all around.

  According to a fourth aspect of the present invention, there is provided a closing body that closes the gap between the cover and the body in at least a part of the portion that is made of a flexible material and is around the opening of the housing recess and is not provided with the fusion conductive wire. Since it is provided, waterproofness can be improved compared with the case where an obstruction is not provided. Moreover, manufacturing cost can be reduced compared with the case where a plurality of fusion conductive wires are provided. Furthermore, even when the notification circuit transmits and receives radio waves to and from the outside, the fusion conductive wires are less likely to inhibit the radio waves compared to the case where the fusion conductive wires surround the housing recess all around.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  Since the basic configuration of this embodiment is common to the conventional example shown in FIGS. 5A and 5B, the same reference numerals are assigned to the common configurations, and illustration and description thereof are omitted.

  In the present embodiment, the body 11 and the cover 12 are each made of a thermoplastic resin. 2A and 2B, the body 11 is provided with a groove 11a surrounding the housing recess 10, and the cover 12 has a protrusion 12a inserted into the groove 11a. Further, as shown in FIG. 1, a fusion conductive wire 4 made of, for example, a thin metal wire is accommodated in the groove 11 a, and the projection 12 a sandwiches the fusion conductive wire 4 between the bottom surface of the groove 11 a. The cover 12 is provided with two current-carrying holes 12 b that expose one end portions of the fusion conductive wires 4.

  When the body 11 and the cover 12 are joined at the time of manufacture, the body 11 and the cover 12 are overlapped with each other, and the protrusion 12a is inserted into the groove 11a, and then the conductive wire to be fused is inserted by inserting an electrode into the energizing hole 12b. 4 is energized. Then, the thermoplastic resin is melted on the inner surface of the groove 11a and the protrusion 12a by Joule heat generated by the fusion conductive wire 4, and the melted thermoplastic resin is cured after the energization to the fusion conductive wire 4 is stopped. Thus, the body 11 and the cover 12 are fused to each other.

  Here, each of the groove 11a, the protrusion 12a, and the fusion conductive wire 4 has a shape in which a part of the ring shape surrounding the housing recess 10 is cut out, and is folded inward from the cut-out both ends. It has an extended shape. The distance between the parts closest to each other at both ends of the welding conductive wire 4 is 0.5 mm to 1 mm, and the thermoplastic resin melted in the welding process spreads over the entire circumference of the housing recess 10. It has become. As a result, the gap between the body 11 and the cover 12 is completely closed. Further, even when radio waves are used as a wireless signal medium, the fusion conductive wire 4 is shaped as described above, so that the fusion conductive wire 4 surrounds the housing recess 10 over the entire circumference. The fused conductive wire 4 is unlikely to obstruct the wireless signal.

  Here, the cover 12 is provided with a battery opening 12c through which the battery 3 passes when the battery 3 is inserted into and removed from the housing 1, and a battery cover 13 that closes the battery opening 12c is fitted, for example, by fitting. Removably attached. Both end portions of the fusion conductive wire 4 are positioned in the vicinity of the battery 3, and each energization hole 12 b is positioned in the vicinity of the battery opening 12 c and is closed by the battery cover 13 together with the battery opening 12 c. The gap between the battery cover 13 and the cover 12 is closed by a packing (not shown) made of a flexible material such as elastomer around the entire circumference surrounding each energization hole 12b and the battery opening 12c. Intrusion of droplets through the battery opening 12c is prevented by this packing.

  According to the above configuration, compared to the case where the body 11 and the cover 12 are coupled to each other by screwing, the body 11 and the cover 12 are less likely to slip, thereby improving the rigidity of the housing 1 as a whole. In addition, since the mechanical strength required for the cover 12 is reduced, the housing 1 can be thinned. In addition, the heat at the time of fusion is less likely to damage the circuit components of the abnormality detection circuit and the transmission circuit, compared to vibration in the case where ultrasonic bonding is used to bond the body 11 and the cover 12. Furthermore, the body and the cover can be coupled in a short time compared to the case where an adhesive is used for coupling the body 11 and the cover 12.

  Further, compared to the case where the body 11 and the cover 12 are fused to each other by heating the outer surface of the housing 1, the appearance is improved because the portion to be fused is inside the housing 1. Furthermore, at the time of resource recovery after disposal, the body 11 and the cover 12 can be easily separated by melting the fused part by energizing the fusion conductive wire 4 again.

  As shown in FIGS. 3 (a) and 3 (b), even when the distance between both ends of the fusion conductive wire 4 is increased so that the radio wave is not easily disturbed when the radio wave is used as a wireless signal, If the closing body 5 made of a flexible material such as an elastomer is disposed in a portion where the body 11 and the cover 12 between both ends of the conductive wire 4 are not fused to each other, the closing body 5 causes the body 11 and the cover 12 to be connected to each other. The same waterproofness can be ensured by closing the gap between them.

It is sectional drawing which shows the principal part of embodiment of this invention. (A) and (b) show the same as above, (a) is a rear view showing a cover, and (b) is a front view showing a body. (A) (b) shows another form same as the above, respectively (a) is a rear view which shows a cover, (b) is a front view which shows a body. (A) is explanatory drawing which shows the example of the alarm device which detects destruction of a window glass, (b) is explanatory drawing which shows the example of the alarm device which detects opening of a window. (A) and (b) each show a conventional alarm device, (a) is a rear view showing a cover, and (b) is a front view showing a body. It is sectional drawing which shows the principal part same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Printed wiring board 3 Battery 4 Fusion conductive wire 10 Storage recessed part 11 Body 12 Cover

Claims (4)

A housing;
A battery housed in a housing;
An abnormality detection circuit that outputs an abnormality detection signal when an abnormality is detected using a battery as a power source housed in a housing;
A notification circuit that notifies the abnormality when the abnormality detection circuit outputs an abnormality detection signal;
The housing is configured between a body provided with a storage recess and a space mechanically coupled to the body to close the storage recess and store the battery, the abnormality detection circuit, and the notification circuit, respectively, between the inner surface of the storage recess. With a cover to
An alarm device characterized in that the cover and the body are fused to each other at the opening edge of the storage recess. The body and cover are each made of thermoplastic resin,
At least one fusion conductive wire made of a conductive material and sandwiched between the body and the cover and energized when the body and the cover are coupled to each other at the time of manufacture to fuse the body and the cover to each other by Joule heat. The alarm device according to claim 1, further comprising:   The fusion-bonded conductive wire is a single shape that lacks a part of the ring shape surrounding the opening of the housing recess, and the length of the lacked part is a thermoplastic resin that is melted when the body and the cover are fused. The alarm device according to claim 2, wherein the alarm device is short enough to spread. There is only one conductive wire for fusion, and a part of the ring shape surrounding the opening of the housing recess is missing,
And a closing member that closes a gap between the cover and the body in at least a part of a portion that is made of a flexible material and is around the opening of the housing recess and is not provided with the conductive wire to be fused. Item 3. The alarm device according to Item 2.

Images