RU2559695C2 - Electronic indicator - Google Patents

Abstract

FIELD: physics, signalling.

SUBSTANCE: invention relates to electronic engineering, particularly to alarm systems, and can be used in developing methods and equipment for controlling access to a facility. The electronic indicator comprises a housing which consists of two electrodes separated by a dielectric insert, which form a capacitive sensitive element which is electrically connected to a power supply, an indicative communication interface coil and an electronic unit for measuring capacitance of the sensitive elements, processing and storing information, said components being located inside the housing and connected to each other, and a safety cap which is installed on the housing of the device.

EFFECT: low temperature dependence and improved performance of the device.

5 cl, 3 dwg

Description

The invention relates to the field of electronic technology, in particular to alarm systems, and can be used in the development of methods and means of access control to an object.

A device is known that contains a cylindrical case, on the external surface of which a thread is made for attaching this device to a controlled object, a power source, a capacitive sensitive element, a winding and a central processing unit (CPU) are electrically connected to each other. The CPU includes a microcontroller, a quartz resonator, a communication interface and a circuit for measuring the capacitance of a sensitive element, including a resistor (US patent No. 6791465, publ. 04/18/2002, IPC F16B 41/00, G08B 21/00, F16B 31/02) .

The disadvantages of this device are the need to pair it with a reader for transmitting data; the possibility of false positives due to the temperature dependence of the capacitive sensitive element.

A device is known, which is a cylindrical body in which are installed: a battery; a fixed electrode made in the form of a disk of ceramic material; movable electrode; induction interface winding, central processing unit (CPU), cover, upper nut, lower nut and disk springs. The movable electrode is made in the form of a cylinder, on the outer surface of which a groove is made. Belleville springs fixed in the groove are fixed with a lower nut. From the outer end of the movable electrode, a blind threaded hole is made for fastening the device to a controlled object. One of the end surfaces of the fixed electrode / ceramic disk is coated with silver sputtering. In the case, the disk is mounted in such a way that it is oriented towards the movable electrode by the bare side. The movable and fixed electrodes form a capacitive sensitive element (RF patent No. 2401460, publ. 10.10.2010, IPC: G08B 21/00, F16B 31/02, F16B 41/00 - prototype).

The device operates as follows.

When the device is screwed onto the threaded rod of the controlled object, the disk springs are compressed and the air gap between the movable electrode and the ceramic disk / fixed electrode increases. When the device is unscrewed under the influence of cup springs, the air gap decreases, which leads to a change in the capacitance of the sensing element, recorded by the CPU as a fact of access to the object. Information about access facts can be transmitted remotely via an induction interface to an external reader.

The disadvantage of this device is the need for power pairing of the device with a controlled object, the presence of movable elements in the structure.

The task to which the claimed invention is directed is to create a universal device that saves information about the sealing procedure and information about attempts to access a controlled object, eliminating the possibility of unauthorized replacement of an electronic indicator device with an identical one.

The solution of this problem is achieved by the fact that the proposed electronic indicator according to the invention comprises a housing consisting of two electrodes, mainly of cylindrical shape, separated by a dielectric insert, forming a capacitive sensing element connected to a power source located inside the housing and interconnected, a winding of the induction communication interface and electronic unit for measuring the capacitance of a sensitive element, processing and storage of information, a protective cap made of dielectric material installed on the housing and providing an overlap of the indicator housing preferably along its entire height, while on the inner surface of the protective cap structural elements are made that engage with mating structural elements on the outer surface of the housing and ensure that the protective cap is fixed from axial movement after installation on the body of the electronic indicator, and these structural elements are designed in such a way that provides priority l remove the protective cap from the housing of the electronic indicator to remove the specified housing from the controlled object.

In the embodiment, an annular metal insert is installed inside the protective cap on the side of its inlet end, so that when the protective cap is installed on the indicator housing in the working position, the said insert does not guarantee overlapping the dielectric insert between the electrodes, while the height of the annular insert on the axis is selected from conditions for exceeding the height of the dielectric insert between the electrodes.

In an embodiment, one of the electrodes is made with a profiled end part for connection with the counter profiled part of the controlled object.

In an embodiment, an external or internal thread is made at the end of the electrode mating with the controlled object for docking with the controlled object.

In an embodiment, the protective cap is threaded for connection with a controlled object.

The technical result achieved by the claimed invention is to improve operational characteristics and expand the scope of the device that records the fact of access.

The technical result is achieved in that the capacitive sensitive element of the electronic indicator consists of two electrodes, which are parts of the electronic indicator housing, separated by a dielectric insert, electrically connected to a power source located inside the housing and interconnected, an induction communication interface coil and an electronic sensor capacitance measuring unit , processing and storage of information, while a protective cap made of dielectric material is installed on the housing and to protect the capacitive sensor from the effects of random noise, configured so as to prevent removal of the indicator with the electronic controlled object without removal of the protective cap. On the inner surface of the protective cap, structural elements are made that mesh with the reciprocal structural elements on the outer surface of the housing and provide a fixation of the protective cap against axial movement after it is installed on the housing of the electronic indicator, and these structural elements are designed in such a way that eliminates the removal of the electronic indicator from controlled object when removing the protective cap. The thickness of the protective cap is selected from the condition of ensuring the required level of protection of the capacitive sensitive element from the effects of random interference.

In the embodiment of the electronic indicator, an annular metal insert is installed inside the protective cap on the inlet end side, while the height of the insert is made in such a way that, when the protective cap is fixed on the seal body in the working position, overlapping of the insulating insert between the electrodes of the specified metal insert is excluded.

In an embodiment, the electrode mating with the controlled object is made in the form of a body of revolution with a profiled end part for connection with the counter profiled part of the controlled object.

In an embodiment, an external or internal thread is made at the end of the electrode mating with the controlled object for docking with the controlled object.

In an embodiment, the protective cap is threaded for connection with a controlled object.

The use of a new design scheme of a capacitive sensitive element, namely: the implementation of the electrodes as housing elements, the exclusion of the mobility of the electrodes in the process of functional use, the implementation of one of the electrodes in the form of fixing means - can reduce the size, simplify the design of the electronic indicator and increase reliability, expand the scope .

The absence of a gap between the electrodes that is changed during the operation — the installation of electrodes through a spacer — allows one to practically eliminate the influence of a structural electronic indicator on the value of the specified gap, thereby reducing the error of the capacitive sensitive element during temperature changes during operation — expanding the range of operating temperatures.

The absence of a movable electrode, therefore, the absence of the need for power pairing of the electronic indicator with the controlled object — to set the working gap between the electrodes — allows expanding the range of controlled objects of the proposed device due to the possibility of installing the electronic indicator on the controlled objects with non-force structural elements.

The proposed technical solution is a constructive scheme of an electronic indicator, the mode of action of which is to register the fact of access when a foreign object is introduced into the sensitive zone of the electronic indicator, based on changes in the dielectric constant of the medium, characterized by the presence of a removable cap that is installed on the body of the electronic indicator and restricts during installation and opens when removing access to the sensitive area, allows you to expand the scope of the electronic indicator as control devices. The indicated feature of the design scheme - restriction of access to the sensitive area with the protective cap installed and removal of the restriction when the cap is removed - allows the use of an electronic indicator in cases requiring the prompt opening of a controlled passage / opening, etc.

The invention is illustrated by drawings, where in FIG. 1 is a cross-sectional diagram of an embodiment of an electronic indicator with an external threaded docking member, FIG. 2 shows an embodiment of an indicator with an internal threaded docking element, FIG. 3 shows a cross-sectional diagram of an embodiment of an electronic indicator.

The electronic indicator comprises a housing consisting of a first electrode 1, a second electrode 2 and an intermediate insert 3 of electrically insulating material forming a capacitive sensitive element. At the first electrode 1, structural elements are made for mounting the indicator on a controlled object. A power supply 4, an inductor 5, and an electronic unit 6 are installed inside the housing. A protective cap 7 is installed on the electronic indicator housing. In an embodiment, an inner metal insert 8 is installed inside the protective cap 7 from the input end face.

The electronic indicator works as follows.

The electronic indicator is fixed on the monitored object, a protective cap 7 is installed on the case of the electronic indicator.

If the protective cap 7 is removed, the sensitivity of the capacitive element consisting of electrode 1, electrode 2 sharply increases. When an object with a dielectric constant different from the dielectric constant is introduced into the sensitivity zone of the medium, the input capacitance of the sensitive element changes, and a pulse is generated that initiates recording on the fact of access indicating the date and time of access to the internal memory of the electronic unit 6. The presence of an induction communication interface provides POSSIBILITY data remotely to an external reader.

In the embodiment of the protective cap 7 with the inner ring 8 of metal material, the formation of a pulse initiating a record of the fact of access occurs already at the time of removal of the protective cap 7.

Using the proposed technical solution will improve operational characteristics, reduce manufacturing costs and expand the scope of the electronic indicator.

Claims (5)

1. An electronic indicator, characterized in that it contains a housing consisting of two electrodes separated by a dielectric insert forming a capacitive sensing element connected to a power source located inside the housing and interconnected, a winding of the induction communication interface and an electronic unit for measuring the capacitance of the sensitive element, processing and storage of information, a protective cap of dielectric material mounted on the housing, and the protective cap is made in this way that access to the indicator housing mounted on the controlled object is excluded, while on the inner surface of the protective cap structural elements are made that mesh with the response structural elements on the outer surface of the housing and ensure the fixation of the protective cap from axial movement after it is installed on the electronic indicator housing, moreover, these structural elements are designed in such a way that ensures the priority of removing the protective cap from the housing e ics indicator prior to removal of said housing from a monitored object. 2. The electronic indicator according to claim 1, characterized in that an annular metal insert is installed inside the protective cap from the side of its inlet end, so that when the protective cap is installed on the indicator body in the working position, the said insert does not guarantee overlapping dielectric insert between the electrodes while the height of the annular insert along the axis is selected from the condition of exceeding the height of the dielectric insert between the electrodes. 3. Electronic indicator according to any one of paragraphs. 1, 2, characterized in that one of the electrodes is made with a profiled end part for connection with the mating profiled part of the controlled object. 4. Electronic indicator according to any one of paragraphs. 1, 2, 3, characterized in that on the end of the electrode, mating with the controlled object, made of external or internal thread for docking with the controlled object. 5. Electronic indicator according to any one of paragraphs. 1, 2, 3, 4, characterized in that the protective cap is threaded for connection with a controlled object.

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