JPH07507167A - alarm sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] alarm sensor The present invention relates to sensors for use in burglar alarm and/or smoke alarm systems. do.

In a first aspect, the invention is in a case; A smoke detector capable of detecting smoke through the surrounding atmosphere outside the case when in use: inside the case, and an infrared detector that can detect infrared rays outside the case when in use. Provides sensors consisting of:

Sensors with either infrared detectors or smoke detectors are technically well known. It is. However, such two detectors can be combined into one sensor as in the present invention. Previously, it was not known that it could be absorbed.

In the past, passive infrared theft detectors and smoke detectors were used for protection. In order to do so, install two such sensors in each room to be protected. There was a need. In such an arrangement, each sensor has its own local alarm circuit and cable. It is relatively expensive because it requires a separate storage space. Two sensors like this Installing them in each room is also an inconvenience and sometimes a nuisance.

In the present invention, said two detectors are monitored by a local alarm circuit; At least some portion of the path is common to both detectors, thereby can reduce the cost and complexity of information systems. In addition, only one sensor is installed in each room. It can be installed to provide both a smoke alarm and an infrared burglar alarm.

This is thought to be the reason why the sensor design was different from the conventional sensor design or the design of the present invention. The point is that the requirements for installing smoke detectors are generally similar to the requirements for infrared detectors. Don't be gross. For example, smoke detectors communicate directly with the surrounding atmosphere in the room. designed so that the presence of smoke can be easily detected. circumference of detector Air from the surrounding atmosphere enters or passes through the case in which the smoke detector is contained. It is desirable to be able to do so. Infrared detectors, on the other hand, are housed in sealed cases. It is designed to prevent insects from walking around on the detector if it is not sealed. This is because it may cause the alarm to malfunction.

The problem with the above requirements for integrated use is that infrared detectors can be used by thieves or other This is the case with a passive detector whose purpose is to detect the body temperature of an intruder. If the detector When an insect crawls on a surface, the insect's body temperature at such a close distance is enough to cause a malfunction. I'm afraid.

In the present invention, the case is provided with an area that is open to the surrounding atmosphere inside or outside the case. Furthermore, said smoke detector is located within this open area, and said sensor - or means for separating the infrared smoke detector from said open area by a partition. It is preferable.

This arrangement ensures that the smoke detector is open to the surrounding atmosphere and that The infrared detector is separated from the open area by a partition and the case is opened. Reliably prevents insects that may enter the area.

means for partitioning and separating the infrared detector or a means for a chamber within said case; At least a portion of the wall of the chamber means is substantially transparent to infrared radiation; the wire is inserted into said chamber means; said chamber means is Preferably, it houses an outside line detector. The chamber means has an open area. The area may be substantially sealed off from the area.

The transparent portion of the wall of the chamber or a portion of the outer wall of the case may be included. is preferable, and may be formed as a window in the wall of the case.

According to the design of the normal infrared infrared sensor, the infrared detector detects the infrared rays of the wall. It is preferably separated at a distance from the transparent part, so that the The alarm will probably not go off due to insects crawling on top.

The infrared detector may be mounted on a circuit board, the circuit board being one of the chambers. It forms the wall of the steps. Smoke detectors are mounted on the same circuit board as infrared detectors. You may be

The case includes a front half of the case and a rear half of the case which together form the case. It may be configured as follows. The chamber is an enclosure attached to the front half of the case. It may also include a shroud.

The case has openings in its walls so that the smoke detector can It may be designed to communicate with the surrounding air. The opening may be made in - or more than one wall. but the opening allows smoke to flow through the open area of the case. Or preferable.

As a close aspect, the invention provides a case for the sensor defined above. the case includes an area for housing the smoke detector, and the area is configured to close the case when in use. the outside of the case is open to the surrounding atmosphere, and the case is further equipped with an infrared detector. a chamber containing the smoke detector, the chamber containing the smoke detector in use; partitioned off from the region, at least a portion of the wall of the chamber comprising: Substantially transparent to infrared light so that infrared light can enter the chamber when in use It looks like this.

In such cases, a particularly preferred form of sensor may be created, as described above. Ru.

Embodiments of the invention will now be explained by way of example with reference to the accompanying figures.

FIG. 1 is a perspective view of a sensor according to the invention.

FIG. 2 is a side cross-sectional view showing a wall-mounted sensor.

In the figure, sensor lO houses a passive infrared detector 14 and a smoke detector 16. It is equipped with a case 12. The case 12 has a bow-shaped case front half 12a. and an end wall (end w) having a shape complementary to the arcuate case front half +2a all) 18, and a case rear half 12b.

An infrared detector 14 and a smoke detector 16 are mounted on a circuit board 20 and The road plate is fastened to the rear half +2b of the case by means of retaining clips 22.

The circuit board 20 includes connectors forming local alarm circuits for both detectors. It also supports the turret block 24 and other circuit components (not shown). Some of those circuits are common to both infrared detectors 14 and smoke detectors. I can do it.

The front half of the case +2a is made to have a rectangular opening 26, and after the opening A piece of infrared window material is attached to the side to form a window 28 that is transparent to infrared radiation. ing. A funnel-shaped shroud is provided on the rear side of the window 28. oud) 30 or fixed. The window 28 and the shroud 30 are attached to the case with adhesive. are fixed to the front half 12a, and are substantially flush with the inner surface of the front half 12a of the case. It is designed to form an airtight joint.

As shown in FIG. When assembled, the infrared detector 14 is housed in the narrow end of the shroud 30; At that time, the infrared sensitive surface of the detector 14 faces the window 28. Shroud board 30 The trailing edge 32 is tightly attached to the surface of the circuit board 20 to form an effective seal. be done. A window 28, a shroud 30, and a portion of the circuit board 20 surrounding the infrared detector 14 together define a chamber 34, which chamber has an infrared sensing A device 14 is housed therein and separated from the smoke detector 16 by a partition.

The remainder of the interior of the case is provided by openings 38 in the end walls 18 and openings 40 in the side walls of the case. , forming a region 36 open to the external atmosphere. (For clarity , only the opening 40 near the end wall is shown in the figure. However, the opening 40 is in the side wall. It should be understood that the entire length is open. ) openings 36 and 40 are Each is approximately 2 mm wide, which allows gas and smoke from the atmosphere surrounding the sensor lO to be absorbed. or through the case 12 and, in particular, through the smoke detector 16. . This dimension of the opening prevents spiders, insects, and other insects from entering the case through the opening. It's big enough to squeeze in. However, the surrounding plate 30 around the infrared detector 14 , so tightly attached that all such insects can be detected by infrared detectors. Do not enter the chamber 34 where 14 is housed, causing a false alarm. I can't do that.

In accordance with conventional infrared sensor design, infrared detector 14 is located at a distance from window 28. so that even if an insect crosses in front of the window 28, the detector 14 The detector 14 is not close to the point where the alarm will be activated erroneously.

This embodiment is designed to be installed vertically on the wall of the room, quite close to the ceiling. Designed. This allows the detector to be unobstructed by objects such as furniture. It has a clear infrared ``sight''. The window 28 described above is suitable for such an installation. It is formed as a Fresnel lens so that it fits from below the sensor IO (arrow 4 2) to focus the incoming infrared light on the sensitive surface of the infrared detector. arranged to match. At such a high location, case I2 It is easy to become a home for spiders. However, the partition rechamper 34 Ensures effective operation of sensor IO without causing false alarms caused by insects It will be appreciated that this is particularly advantageous in ensuring that the system remains the same.

The opening 38 in the end wall 18 of the case 12 allows the case 12 to be mounted vertically. If the smoke freely enters the case 12 from below (as indicated by arrow 44) , can flow through the case 12. However, the opening 40 is located in the side wall. Since the case 12 is mounted at a certain angle to the vertical, or for example It can even be mounted horizontally on the ceiling.

To indicate that the sensor IO is active and "armed" , an indicator may be provided on or inside the case 12. example For example, an indicator light may be installed in the chamber 34 with infrared sensing to illuminate the window 28. It can also be attached together with the container 14. Alternatively, for example, an indicator light may be placed outside the chamber 34. It may be installed on the side circuit FIi, 20, or from the light or indicator light to the surface of the window 28. A sealed light pipe (sealed l) is installed as part of the shroud 30 so as to light-pipe) 46 (shown in phantom in Figure 2) good.

In this embodiment, the shroud 30 is attached closely to the circuit board 20. This ensures that spiders, insects, and other insects are prevented from entering the chamber 34. In other embodiments, although the configuration is sufficient to Incorporating a sealing compound or device to ensure a reliable seal. That's preferable. For example, the space between the shroud 30 and the surface of the circuit board 20 is reliably sealed. For this purpose, a sealing member may be provided, by means of which the chamber 34 is closed to the open area 3. 4 is substantially cut off and sealed.

The present invention and particularly the preferred embodiments described above overcome the disadvantages of the prior art described above. It will be appreciated that a sensor is provided that can overcome this problem.

The invention has been described above purely by way of example, and modifications of detail or scope of the invention have been described above. Of course it will be understood that what can be done within the

Submission of translation of written amendment (Article 184-8 of the Patent Law) June 28, 1994

Claims (12)

[Claims] 1. With a case; inside the case, when in use, smoke is communicated with the surrounding atmosphere outside the case. A smoke detector that can detect A sensor comprising a detectable infrared detector. 2. the interior of said case comprising an area open to the exterior surrounding atmosphere; A smoke detector is placed within this open area; A sensor according to claim 1, comprising means for partitioning a detector from said open area. Sir. 3. Means for partitioning and separating the infrared detectors includes a substantially sealed channel within said case. at least a portion of the wall of the chamber means being resistant to infrared radiation; the chamber means is substantially transparent and adapted to allow infrared radiation to enter the chamber means; 3. A sensor according to claim 2, wherein the chamber means contains said infrared detector. -. 4. The transparent portion of the wall of the chamber includes a portion of the outer wall of the case. The sensor according to claim 3. 5. The transparent portion of the chamber wall includes an infrared transparent window in the outer wall of the case. 5. The sensor according to claim 4. 6. Turn the indicator light inside the case through the transparent window to indicate that the sensor is in defense. 6. The sensor of claim 5, further comprising means for shining through. 7. an infrared detector mounted on a circuit board forming a wall of said chamber means; 7. The sensor according to claim 3, 4, 5 or 6, wherein the sensor is eclipsed. 8. Claim wherein the smoke detector is mounted on the same circuit board as the infrared detector 7. The sensor described in 7. 9. The case includes a first half of the case and a second half of the case that together form the case. The chamber includes a shroud attached to the front half of the case. A sensor according to any one of claims 3 to 8, comprising: 10. Claims wherein the chamber is sealed substantially insulating from open areas. The sensor according to any one of Items 3 to 9. 11. The open area of the case is connected to the external periphery by an opening in the wall of the case. 11. A sensor according to any of claims 2 to 10, in communication with the surrounding atmosphere. 12. The sensor case according to any one of claims 1 to 11, The case includes an area that houses the smoke detector; the area extends around the outside of the case when in use. open to the atmosphere; the case further includes a chamber housing an infrared detector; comprising: said chamber being partitioned from said area housing the smoke detector in use; at least a portion of the wall of the chamber is substantially opaque to infrared radiation; transparent, allowing infrared radiation to enter the chamber during use. Case for sensor.