DE2815309A1 - Opto-electronic door or window surveillance system - has line of sensors scanned with signals transmitted via lens to receiver - Google Patents

Abstract

An opto electronic sensing device provides a security system for doors and windows that is effective when they are open. The system uses a plano-convex lense with a fibre optic bundle to direct light onto a receiver located at the focal point. There are transmitters located in lines radiating outward from the focal point and they are scanned by either a microprocessor unit or wired logic. The lines of sensors provide complete surveillance over a radius of 5-10 metres.

Description

Opto-electronic curtain

for securing doors, windows, zones and surfaces The rapid development in the semiconductor and electronics market is mainly for ever newer and better ideas and inventions for active and passive safety of people or evaluated by society. This is what alarm systems and their additional equipment are like today subject to serious change. With the so-called room monitoring through Ultrasound, radar and infrared motion detectors are the effectiveness of the protection currently optimal. The application of the so-called.

Outer skin protection in connection with the room protection is without To see doubts as the maximum safeguard. The hull protection is, however unfortunately sensitive due to the lack of suitable, trouble-free working detectors restricted. For example, doors and windows with magnetic contacts and Glass break detectors and light barriers, etc. secured. However, this always continues assumes that the objects to be secured must be closed. Especially in the During the summer months, this solution proves to be very annoying, apart from the laborious one and unsightly installation as well as the cost factor.

The purpose of the invention is now to provide a device that works trouble-free, an opening to the outside (windows, doors, surfaces, etc.) absolutely closes, is easy to install and works precisely in all environmental conditions.

According to the invention, a light beam is now generated via a plano-convex lens collected and placed in focus on a photosensitive element. In the spotlight - but lying horizontally offset a number of light transmitters on each side, you by their arrangement and the refraction angle of the optics in different Distances cross the receiver beam.

These light transmitters are now cyclical through a logic circuit energized one after the other and thus also result cyclically according to the invention different ray crossing points.

If an object lies within an intersection point, this will be The light emitted by the energized transmitter is fed to the light receiver via the optics and the logic recognizes at what distance from the lens the light reflecting Object is located. According to the invention, the logic (hardware or microprocessor) the status is saved and each new status is compared and evaluated.

According to the invention, the arrangement of several optical systems with the associated light transmitters and light receivers any number of Sensitive measuring sections are formed, which forbid any intruder to go undetected by penetrate the sensitive radiation field.

According to the invention can also be connected by this arrangement with logic a number. can be preprogrammed by trigger or alarm thresholds. Example: All-round protection of a danger area with a safety belt from approx. 5 - 10 meters. If the intruder enters the sensitive zone - advance warning or message; with further movement in the direction of the danger area, e.g. 2 meters in front of the object - alarm message. According to the invention, the device found is with invisible light, modulated with a code and protected with a filter, any Withstand environmental influences.

In picture A you can see the schematic arrangement of the optics with light receiver and light transmitter.

Figure B shows the evaluation logic schematically.

Figure C shows the possible applications.

Claims (5)

Patent claims ö opto-electronic curtain for securing doors, Windows, zones and areas characterized in that a suitable optics one The bundle of rays is focused and directed onto a light receiver, making it a sensitive one Zone on the central axis of the optics and this zone by a number of Light transmitters, arranged in parallel at the focal point, but shifted horizontally, scanned and reflections of the receiver via its sensitive zone when entering the intersection zones which are used for evaluation. 2. Opto-electronic curtain for securing doors, windows, zones and surfaces according to claim 1, characterized in that the light transmitter in one specific sequence in cyclical operation and therefore the sensitive Zone through the different intersection points of the transmitter beams on the sensitive Receiver beam zone the distance between the reflected object and the receiver can be determined and becomes measurable. 3. Opto-electronic curtain for securing doors, windows, zones and surfaces according to claims 1 and 2, characterized in that the transmitter and receiver work in the invisible spectrum of light rays and through filters as well as the additional Modulation of the transmission beams are absolutely insensitive to environmental influences. 4th Opto-electronic curtain for securing doors, windows, zones and surfaces according to claim 1, 2 and 3, characterized in that by suitable Arranging several optics a multitude of sensitive zones can be achieved and thus a surface coverage of objects is possible. 5. Opto-electronic curtain for securing doors, windows, zones and surfaces according to claim 1, 2, 3 and 4, characterized in that by a Evaluation logic through the range measurement of the system, which can be determined according to the invention Alarm and detection thresholds that can be evaluated differently for each sensitive zone are.