DE2359261A1 - Intruder surveillance alarm system - is for buildings or large sites and employs an infra-red beam - Google Patents

Abstract

The alarm system has an elongate housing pref. of rectangular cross-section, which contains a source for providing an IR beam. This passes through a convex lens and is then intercepted by three mirrors spaced along the housing and each deflecting part of the beam to provide three output beams, which exit from the housing via respective windows. The trhee output beams are equally spaced from each other in the same plane and travel along parallel paths. towards a receiver unit, with the alarm being released upon any of the beam being broken.

Description

PATENT LAWYERS MEISSNER & BOLTE

DIPL.-ING. HANS MEISSNER DIPL.-1NG. ERICH BOLTE

Applicant:

1) Erwin Herbert Fietz 2830 B a s s u m

Long wall 1

2) Wilfried Wolfgang Krüger 2110 Buchholz

Bendestorferstrasse 32

Nov 19, 1973

D 28 BREMEN,

SlevogtstraBe 21 Federal Republic of Germany Telephone 0421-34 2019 Telegrams: PATMEIS BREMEN

Our sign

6612

Device for monitoring rooms, properties, systems, etc.

The invention relates to a device for monitoring rooms, properties, systems, etc. by radiation, in particular infrared rays that are emitted by the transmitter and received by the receiver, with a through the Object moved through the beam triggers an alarm.

The constant automatic monitoring of large-scale outdoor facilities is becoming increasingly important. It will In practice, the requirement to monitor increasingly larger areas and thus longer distances. the The necessary physical facilities are in principle ready for this. In practice, however, it has been shown that a single beam path still extending over a longer distance between the transmitter and receiver no sufficient guarantee for the safeguarding of the to be monitored Area there. If the beam path is a relatively small distance from the ground, the

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Danger that this barrier can be easily exceeded is rendered ineffective. If, on the other hand, the beam path is directed at a greater distance from the ground, there is a risk of that the barrier is undermined.

The invention is based on the object of a monitoring device To propose the type mentioned, in which the aforementioned disadvantages to simple, economical Way to be avoided.

To achieve this object, the invention consists in that the beams emitted by a transmitter are deflected are divided into several beam bundles directed at a distance from one another.

In the device according to the invention, a "fence" is therefore from several, z. B. formed three beams running one above the other in an upright plane. Every bundle of rays is directed to its own receiver or to a receiver common to all beams.

The advantage of the invention is on the one hand that in the upright plane several barriers with correspondingly low Clearance from the ground and from each other is a sufficient height. Overcoming this obstacle would be associated with extraordinary difficulties. Another advantage is that in a preferred embodiment Beams extending at a distance from one another are generated by a common transmitter and by a common one Recipients are included. The outlay on equipment and the energy requirement are therefore low.

The division of the rays emitted by the transmitter into individual ones

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separate bundles of rays and the collection of these bundles of rays and redirecting to a common receiver is done by reflectors in the beam path of the transmitter and / or of the receiver are arranged.

Further details are given below with reference to an exemplary embodiment of the invention shown in the drawings explained in more detail. It shows:

1 shows a monitoring device according to the invention in a schematic representation as a side view,

2 shows a part of the device in vertical section, on a larger scale,

Fig. 3 is a vertical section of the upper portion of the Details according to FIG. 2, on a further enlarged scale,

FIG. 4 shows a horizontal section IV-IV to FIG. 3.

The device according to the invention is particularly suitable for Monitoring of extensive facilities, especially suitable for outdoor facilities. In a housing 10, which has the shape of a If the column has, for example, a rectangular cross-section, a transmitter 11 (or receiver) is arranged. The housing 10 is let into the underground 12 here. The transmitter 11 (or receiver) is located in the lower area of the housing 10.

This transmitter emits rays, in particular infrared rays 13. Such transmitters 11 are for purposes

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known to the surveillance and commercially available · The rays of the Transmitter 11 are controlled by suitable optical aids, e.g. formed into a beam path 15 by a converging lens 14. As can be seen from FIG. 2, this beam path 15 is shown in FIG Longitudinal direction of the upright housing 10 directed

Within the housing 10 in the beam path 15 are several, in the illustrated embodiment three reflectors 16, 17, 18 arranged. These reflectors 16, 17, 18 are arranged vertically at a distance from one another, preferably with equal intervals. Within the cross section of the housing 10, the reflectors 16, 17, 18 are offset from one another, in such a way that a part of the beam path 15 acts on each reflector.

The reflectors 16, 17, 18 are so arranged, preferably at an angle of about 45 °, that the part of the beam path 15 received by the reflectors is deflected will. In the exemplary embodiment shown, the deflection takes place in a direction perpendicular to the beam path 15. The beam bundles 19, 20 and 21 generated in this way at the level of the associated reflectors 16, 17, 18 pass over corresponding ones Openings 22, 23 and 24 from the housing 10. The emerging bundles of rays 19, 20, 21 form a corresponding one Number, namely three light barriers arranged one above the other and lying in one plane.

The radiation bundles 19, 20, 21 emitted by a housing 10 are passed through an opposing housing 10a of im Receive principle of the same structure. This receiver device with the housing 10a corresponds to the device according to FIG Fig. 2, with the only difference that instead of the transmitter 11, a receiver is installed here. The by the

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individual reflectors 16, 17, 18 received bundles of rays 19, 20, 21 are combined to form a beam path 15 and fed to the receiver 11 via the converging lens 14. This receiver 11 is also of a commercially available type which is known in principle. The sensitivity of the recipient 11 is set so that if only one beam 19, 20 or 21 is interrupted, a signal is triggered.

The reflectors 16, 17, 18 are adjustable in the housing 10 and 10a, at least with regard to their angular position. In the illustrated embodiment, the reflectors 16, 17, 18 are arranged in frames 25 of the same size. Within this frame 25, the reflectors 16, 17, 18 have different relative positions. In Fig. 3 and FIG. 4 shows the reflector 18 arranged at the upper end of the housing 10 or 10a, which is at an edge of the frame 25 seated.

The frames 25 are mounted pivotably about an axis 26. The axes 26 of the frame 25 lie in a common, upright plane. At a distance from the axes 26 is a Adjusting device for the frame 25 attached. In the present exemplary embodiment, this consists of one Upright spindle 27 on which each frame 25 is mounted with a spindle nut 28. By turning the spindle 27 the reflectors 16, 17, 18 are pivoted together by a certain angular amount, so that always one Parallel position is given. As a result, the emitted bundles of rays 19, 20, 21 of the housing 10 can be directed to the Receiver housing 10a and vice versa are adjusted. The spindle 27 is at the upper end with a molded body 29 for Applying a key.

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It can be seen without further ado that the device can also be used, for example, with two beams or with more than three bundles of rays and each with a common transmitter and receiver can work. Nor is it necessarily required that the transmitter and receiver are arranged in different housings. For shorter monitoring distances transmitter and receiver can be arranged in the same housing. In this case, the signal is generated by reflection of the Rays caused by the object directed through the bundle of rays.

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Claims (11)

2359281 Expectations Device for monitoring rooms, properties, Systems etc. by rays, in particular infrared rays, which are output by transmitters and received by receivers, whereby an object moved through the beam path triggers an alarm, characterized in that the beams emitted by a transmitter (11) are deflected into several beam bundles (19, 20, 21) directed at a distance from one another are divided. 2. Apparatus according to claim 1, characterized in that the split beam (19,20,21) in an approximately upright plane and are directed approximately parallel to each other. 3. Apparatus according to claim 1 or 2, characterized in that the beam (19,20,21) by deflection can be fed to a common receiver (11). 4. Device according to one of claims 1-3, characterized characterized in that the transmitter and receiver (11) each in an elongated, columnar, z. B. rectangular in cross section Housing (10,10a) are accommodated, the housing (10,10a) are arranged upright in a distance corresponding to the area to be monitored. 5. Device according to one of claims 1-4, characterized in that the beam (19,20,21) through several Reflectors (16,17,18) arranged at a distance from one another in the housings (10,10a) can be deflected. 509825/03 79 6. Apparatus according to claim 5, characterized in that the reflectors (16,17,18) within the beam path (15) of the transmitter or receiver (11) are arranged offset to one another. 7. Apparatus according to claim 5 and one of the further claims, characterized in that in the housing (10,10a) Transmitter or receiver (11) at one end, preferably at the lower end, and several reflectors (16, 17, 18) in the beam path (15) of the transmitter or receiver (11) arranged vertically at a distance and at an angle to the beam path (15) are such that the beams (19,20,21) emitted by the reflectors (16,17,18) from each reflector (16,17,18) associated openings (22,23,24) of the housing (10,10a) emerge or through these openings into the housing enter. 8. Apparatus according to claim 5 and one of the further claims, characterized in that the reflectors (16,17,18) are adjustable, in particular with regard to their angular position. 9. Apparatus according to claim 8, characterized in that all reflectors (16,17,18) of a housing (10,10a) together adjustable, in particular pivotable. 10. Apparatus according to claim 5 and one of the further claims, characterized in that the reflectors (16,17,18) are each arranged in preferably matching frames (25), each frame (25) around an axis (26) is pivotable. 11. The device according to claim 10, characterized in that 509825/0379 that the frame (25) together by a continuous Spindle (27) can be pivoted via a spindle nut (28) each. For the applicant: Meissner & BoIte patent attorneys Bremen, November 19, 1973 Applicant; 1) Erwin Herbert Fietz
2830 B assum Long wall 1 2) Wilfried Wolfgang Krüger,
2110 Buchholz Bendestorferstrasse 32 509825/0379 Le first page