JP2009156596A - Opposing type composite sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain miniaturization of an opposing type composite sensor composed by integrally combining an opposing type microwave sensor with an opposing type infrared sensor. <P>SOLUTION: An infrared projection/reception channel of the infrared sensor is so formed as to be superimposed on a microwave transmission/reception channel of the horn antenna of the microwave sensor. A hole is made in the vicinity of the central part of the horn antenna of the microwave sensor, and a light-projecting element (light-receiving element) of the infrared sensor is disposed at the position of the hole. A transmission optical system is disposed on the plane of opening for transmission and reception of waves of the horn antenna, so that infrared rays are projected (received), in a state of coinciding with the direction of transmission and reception of microwaves. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a composite sensor structure in which an infrared sensor that detects an intrusion of a suspicious person by blocking an infrared beam and a microwave sensor that detects an intrusion of a suspicious person by blocking a microwave are integrated. .

As a conventional intruder detection sensor, a type that outputs a detection signal when a suspicious person crosses this infrared beam with a projector that emits the infrared beam facing a receiver that receives the infrared beam is often used. Has been. In addition, if microwaves are used instead of infrared rays and the transmitting antenna and the receiving antenna are installed facing each other and the gap between them is blocked, a part of microwaves being received is blocked and the received signal becomes small. Therefore, a type of microwave sensor that outputs a detection signal is also used.

In the case of using infrared rays, there is a problem that the infrared beam is interrupted and malfunctions when dense fog occurs. When using microwaves, it is not affected by fog, but there is a problem that it is difficult to set an appropriate reception level because the difference in reception level between when there is no object and when there is no object varies depending on the object. . Microwave sensors are becoming smaller due to the relaxation of regulations on the frequency band used by the Radio Law and technical improvements in transmission / reception modules and antennas. In recent years, an infrared sensor having a size equivalent to that of an infrared sensor has become possible, and a so-called opposed composite sensor in which a microwave sensor and an infrared sensor are aligned and integrated has been put into practical use. Opposite type composite sensors can be used in a way that complements the advantages of microwave sensors and infrared sensors.

The composite sensor is simply a combination of an existing microwave sensor and an infrared sensor arranged side by side, and the overall shape depends on the size of the microwave sensor and the infrared sensor. For this reason, significant downsizing has not been realized so far.
Although the field is different from the present invention, in the technical field of equipment that simultaneously detects microwave, millimeter wave, and infrared electromagnetic waves that are radiated or reflected by the object to be searched, the main reflector incorporated in the search equipment can be shared. It has been implemented. (For example, refer to Patent Document 1.) However, in the counter-type composite sensor in which the counter-type microwave sensor and the counter-type infrared sensor are integrated, the improvement is made individually for the counter-type microwave sensor and the counter-type infrared sensor. In particular, it has not been studied very much because it focused on improving the performance of the microwave sensor itself and the accompanying miniaturization.
Japanese Patent Laid-Open No. 3-120488

Since the conventional counter type composite sensor is simply a microwave sensor and an infrared sensor arranged side by side, the overall shape is long in the vertical direction. FIG. 1 is a diagram showing the structure of a conventional opposed composite sensor, and shows an integrated transmitter 1 of a microwave sensor and a projector 2 of an infrared sensor. Reference numeral 11 is a horn antenna, and 12 is a transmission module. Reference numerals 21 and 22 denote infrared sensor floodlight units. Microwaves and infrared rays are projected from the transmitter 1 and the projector 2 toward a receiver of an integrated microwave sensor and a light receiver (not shown) of an infrared sensor that are installed opposite to each other. Reference numerals 13 and 23 are covers for the microwave sensor and the infrared sensor, and after installation, the cover does not transmit visible light, so that the internal structure cannot be seen from the outside. The integrated microwave sensor receiver and infrared sensor receiver have the same structure as shown in this figure so that it is not possible to determine which is the transmitter and which is the receiver. It has become.

In the opposed composite sensor having such a configuration, the two horn antennas of the microwave sensor and the four light projecting units / light receiving units of the infrared sensor are accurately directed to the opposing antenna, the light projecting unit, and the light receiving unit, respectively. It must be installed, and the amount of work during installation and inspection is increasing. This is a problem with the increase in size of the composite type.

A hole was made near the center of the horn antenna of the microwave sensor, and a light projecting element (light receiving element) of the infrared sensor was disposed at that position. A transmission optical system is arranged on the wave transmission / reception opening surface of the horn antenna so that infrared rays are projected (received) in a state in which the transmission optical system coincides with the microwave transmission / reception direction. The light emitting element (light receiving element) of the infrared sensor is mounted on a printed circuit board fixed to the horn antenna, and the transmission optical system is integrated and held with the horn antenna so as to close the opening of the horn antenna. did.

Since the opposed composite sensor of the present invention overlaps the microwave transmission / reception path of the horn antenna of the microwave sensor and forms the infrared light projection / reception path of the infrared sensor, The unit is no longer needed. As a result, the entire device was downsized. Since the holding of the infrared light emitting / receiving optical system of the infrared sensor is entrusted to the horn antenna, the parts in this part are made common and reduced. Adjusting the direction of the horn antenna of the microwave sensor automatically adjusts the infrared light emitting / receiving path of the infrared sensor, reducing the amount of work during installation and inspection.

The infrared sensor infrared transmission / reception path can be formed so as to overlap the microwave sensor's microwave transmission / reception path of the microwave sensor. If the transmission optical system is of a visible light transmission type, a device (sighting device) for visually recognizing the direction in which the horn antenna faces can be obtained.

FIG. 2 is an explanatory view showing an outline of the main part of the horn antenna of the opposed composite sensor of the present invention. A microwave transmission module 32 is fixed to the lower part of the horn antenna 31. The microwaves emitted from the transmission module 32 are emitted in the direction of the arrow in the figure through the horn antenna 31. A hole is formed in the central portion of the horn antenna 31, and a light projecting element 33 of an infrared sensor is disposed at that position. Further, a Fresnel lens 35 as a transmission optical system is disposed on the transmission aperture of the horn antenna 31 so that infrared rays are projected in a state that matches the microwave transmission direction. The Fresnel lens 35 is made of a material that transmits microwaves. The light projecting element 33 of the infrared sensor is mounted on a printed circuit board 34 fixed to the horn antenna 31, and the Fresnel lens 35 is integrated with the horn antenna so as to close the transmission opening of the horn antenna 31, Is retained.

FIG. 3 is an external perspective view showing the configuration of another embodiment of the main part of the horn antenna of the opposed composite sensor of the present invention. The same number is attached | subjected to the same component as FIG. A microwave transmission module 32 is fixed to the lower part of the horn antenna 31. The microwaves emitted from the transmission module 32 are emitted in a horn shape through the horn antenna 31 in the left direction in the figure. A hole is made in the center upper part and the center lower part of the horn antenna 31, and the light projecting elements 33 of two infrared sensors are arranged at the positions. A longitudinally long Fresnel lens 35 serving as a transmission optical system is disposed on the transmission aperture surface of the horn antenna 31 so that infrared rays are projected in a state that matches the microwave transmission direction. . The Fresnel lens 35 is made of a material that transmits microwaves. The light emitting element 33 of the infrared sensor is mounted on a printed circuit board 34 fixed to the horn antenna 31, and the Fresnel lens 35 is integrated with the horn antenna so as to close the transmission opening of the horn antenna 31, Is retained.

The above is the description of the main part of the horn antenna on the transmitter side of the opposed composite sensor, but the configuration is the same in the receiver. In the receiver, a microwave reception module is fixed to the lower part of the horn antenna, and the microwave emitted from the transmission module 32 reaches the reception module through the horn antenna. A hole is opened near the center of the horn antenna, and the light receiving element of the infrared sensor is disposed at that position. Further, a Fresnel lens as a transmission optical system is disposed on the wave receiving aperture of the horn antenna so that infrared rays are received in a state in which it coincides with the microwave receiving direction. The light receiving element of the infrared sensor is mounted on a printed circuit board fixed to the horn antenna, and the Fresnel lens is integrated and held with the horn antenna so as to close the receiving opening of the horn antenna.

According to the configuration of the present invention, the horn antenna 11 of the microwave sensor 1 shown in FIG. 1 can be incorporated with a light emitting / receiving unit of an infrared sensor, and the size of the conventional microwave sensor remains unchanged. Thus, a counter-type composite sensor is realized.
In addition, by adopting the horn antenna shown in FIG. 3 instead of the two light emitting units of the infrared sensor shown in FIG. 1, an opposing composite sensor can be realized while maintaining the size of the conventional infrared sensor. Will be.
As described above, since the infrared light emitting / receiving path of the infrared sensor is formed so as to overlap the microwave transmitting / receiving path of the horn antenna of the microwave sensor, the entire apparatus is downsized.

In addition, the infrared sensor infrared transmission / reception path can be formed so as to overlap the microwave transmission / reception path of the horn antenna of the microwave sensor. When a light emitting element is arranged and the transmission optical system is of a visible light transmission type, a device (sighting device) for visually recognizing the direction in which the horn antenna is facing can be obtained. Only when the aiming device is used, by adding a switching mechanism that replaces the light emitting element of visible light at the position of the infrared light projecting / receiving element, an opposing composite sensor with a built-in aiming device is realized.

It is the figure which showed the structure of the conventional opposing type | mold composite sensor. It is explanatory drawing which showed the outline of the horn antenna main part of the opposing type | mold composite sensor of this invention. It is the external appearance perspective view which showed the structure of the other Example of the horn antenna main part of the opposing type | mold composite sensor of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transmitter 2 ... Projector 11 ... Horn antenna 12 ... Transmitting module 13 ... Cover 21 ... Projection unit 22 ... Projection unit 23 ... Cover 31 ... Horn antenna 32 ... Transmitting module 33 ... Projecting element 34 ... Printed circuit board 35 ... Fresnel lens

Claims (2)

A hole is made near the center of the horn antenna of the microwave sensor, the light emitting element or the light receiving element of the infrared sensor is arranged at that position, and the transmission optical system is arranged on the opening surface for transmitting and receiving the horn antenna. Infrared light is projected or received in a state that matches the direction of wave transmission and reception, and the light projecting element or light receiving element of the infrared sensor is mounted on a printed circuit board fixed to a horn antenna, and a transmission optical system Is a counter-type composite sensor that is integrated with and held by the horn antenna so as to block the transmission / reception opening of the horn antenna. 2. The opposed composite sensor according to claim 1, further comprising an aiming mechanism in which a visible light emitting element is disposed at a position of a light projecting element or a light receiving element of the infrared sensor and is turned on by an external operation. .

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