JPH02284028A - Two-way type infrared sensor - Google Patents

Abstract

PURPOSE:To generate a warning in two rooms by one detector at the same time by using the two-way type infrared sensor. CONSTITUTION:A pyroelectric body 10 is fitted in one hole 17 formed in a substrate 15, 1-a and 1-b are formed on one surface of this pyroelectric body 10, and 1-c and 1-d are formed on the other surface. Further, an FET 3 and a bias resistance are arranged on the substrate except in the hole 17. Further, one optical filter 8 is fitted directly to the opening part of the substrate and the other is fitted to a conductive case 14. Further, components such as the pyroelectric element and FET are enclosed with the case 14 and the filters 8 fitted to the opening part. This structure makes infrared rays incident on an element from both directions. Namely, the infrared rays can be made incident from the rear to enable two-way detection and the two-way type infrared sensor is fitted to a wall partitioning the two rooms to generate a warning in the two rooms by the one detector at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an infrared sensor for human body detection used in intruder alarms and the like.

[Prior art] The infrared sensor used for the 11-person alarm is LiT.
a0. , PZT and other pyroelectric substances that produce a pyroelectric effect are used.

Figure 2 shows the components of the infrared sensor. Two elements I-a and l-b formed on the pyroelectric body are connected in series with opposite polarity, and the signal obtained from the pyroelectric element is outputted from the source terminal 3 via the bias resistor 2 and FET 3. Ru. 4 is connected to the drain terminal of the FET,
A voltage of t to activate the FET is supplied. These parts are the infrared selective transmission filter 7 and the metal case 8.
is sealed by. The ground terminal 6 is electrically connected to the case, and the outer surface is electrically shielded from magnetic waves.

FIG. 3 shows a typical structure in which these parts are actually assembled into an infrared sensor. A focus tl+lo is supported by a support stand 11 on the light receiving section side of the ceramic substrate 9. Elements 1-a, 1-bl-c, and 1-d are formed on the pyroelectric body 10.

A FET 3, a bias resistor 2, etc. are attached to the wiring surface side of the ceramic substrate 9, and are connected according to the circuit shown in FIG. Lead pin 12 is used for terminal 1.56. The lead pin 12 is glass-sealed to the stem 3, and the stem 13 is welded to a can 14 to which the selective transmission filter 8 is attached using adhesive.

As can be seen from FIG. 3, such a conventional infrared sensor can only detect infrared rays incident in one direction. In FIG. 4, reference numerals 24 and 25 indicate two independent chambers, 26 an infrared sensor, and 27 a lens.

Therefore, at least one infrared sensor was required in every room to be monitored.

[Problems to be Solved by the Invention] The present invention provides a two-way infrared sensor that can detect two rooms simultaneously, in order to simplify current warning systems that require at least one infrared sensor in every room. It provides:

[Means for solving the problem] In an insulating substrate having at least 61 openings, an optical filter is placed in one of the openings, a TL element is placed in the other side,
A device characterized by attaching other peripheral components and sealing these components with a conductive case to which another optical filter is attached, so that infrared rays can enter the element from both directions of the board. It is.

Alternatively, a structure may be adopted in which the optical filter is not attached to the opening of the substrate, but is attached so that the substrate is sandwiched between two conductive cases to which the optical filter is attached. At that time, the pyroelectric element can be attached to one side of the board or to both, so it is possible to configure not only one circuit but two or more circuits as shown in Figure 2. Therefore, the present invention is also effective when expanded as an array element.

[Function] Therefore, the conventional infrared sensor could only capture infrared rays from one direction.

-However, the bidirectional infrared sensor according to the present invention allows light to enter the light receiving surface of the G6 infrared sensor from the red line from the back; therefore, bidirectional detection is possible. became. As a result, two separate intrusion alarms were required for the two rooms, but by installing this two-way infrared sensor on the wall that separates the two rooms, one alarm can be installed in the two rooms. At the same time, it became possible to be cautious.

[Example] Hereinafter, an example of the bidirectional infrared sensor according to the present invention will be described with reference to FIG.

Reference numeral 15 indicates a ceramic substrate and a #8 edge board such as a printed circuit board. A hole 7 penetrating the front and back as shown in the figure is provided in a part of this substrate, and a wiring pattern 16 shown by a fourth bolt is formed on one or both sides of the hole.

For this wiring pattern, in the case of a ceramic substrate, Cu or A1 is used in the case of an Ag printed circuit board. Again, if necessary, a resist pattern is formed on the surface. A pyroelectric material 10 is placed in one of the holes 17 provided in the substrate 15.
is attached, and element I-a is attached to one side of this pyroelectric body lO.
, 1-b, and 1-c and I-d are formed on the other surfaces. Ia, 1-b, 1-c, and ld are connected in the same way as in FIG.

In addition, FET3 and bias resistor 2 (not shown) are
hole] is placed on a board other than hole 7.

One of the optical filters 8 is attached directly to the opening of the substrate, and the other is attached to the conductive case 14. Components such as the optical element and FET are sealed by a conductive case 14 and an optical filter attached to the opening.

In such a structure, infrared radiation can be incident on the element from both directions of the substrate. ]-a, 1-b,
The four elements 1-c and 1-d are made of N 1-Cr to efficiently absorb infrared rays.

It is necessary to form a thin film of Cr by vapor deposition or the like.

FIG. 5 shows two enclosed chambers 19, 20, separated by a wall 21. Therefore, by installing the bidirectional infrared sensor 22 on a part of this wall and installing lenses 23 on both sides, it is possible to monitor two rooms simultaneously with one device as shown in Figure 1.

Although FIG. 1 shows a structure in which components are attached only to one side of the insulating substrate 15, as shown in FIG. The installation also allows for independent extraction of infrared signals incident from the left and right sides. In this case, two pyroelectric elements are attached to the opening, and each component is sealed by two conductive cases to which an optical filter is attached.

Each number in the figure corresponds to each number in FIG. 1. Of course, there is the circuit that is configured on one side of Motoso.

It is also possible to configure a dual twin (two circuits) or more circuits.

Furthermore, as shown in Figure 7, on one insulating substrate,
2 or more lead tf! “1” to both directions with E-case attached.
An infrared alleno sensor can also be easily constructed.

As explained above, in the past, at least one detector was required in two rooms, but by using the bidirectional infrared sensor of the present invention, one detector can be used. It became possible to guard two rooms at the same time.

In addition, this bidirectional infrared sensor can be used for direction detection, automatic doors, etc.
It can be used in a variety of applications with a concept different from conventional ones, and is expected to greatly contribute to expanding the applications of infrared sensors in the future.

[Brief explanation of drawings]

Fig. 1 is a structural diagram showing an embodiment of a bidirectional infrared sensor according to the present invention, Fig. 2 is an electric circuit diagram of the infrared sensor, Fig. 3 is a structural diagram of a conventional infrared sensor, and Fig. 4 is a conventional infrared sensor. 5 is a diagram showing a detection method using a bidirectional infrared sensor according to the present invention, and FIG. 6 is a diagram showing a detection method using a bidirectional infrared sensor according to the present invention. FIG. 7 is a structural diagram showing an embodiment, and an external view of an array of bidirectional infrared cotton sensors according to the present invention.

Claims (1)

[Claims] 1. A conductor wiring pattern is formed on one or both sides of an insulating substrate having at least one opening, an optical filter is attached to one of the openings, and a pyroelectric element and peripheral electronic components are attached to the other side. A bidirectional infrared sensor, characterized in that, after the components are arranged, these components are sealed by at least one conductive case, which is equipped with another optical filter. 2. A conductor wiring pattern is formed on one or both sides of an insulating substrate having at least one opening, a pyroelectric element is attached to the opening, electronic components are arranged in other parts, and an optical filter is attached. A bidirectional infrared sensor characterized in that these components are attached to a board so as to be sealed from both sides using two conductive cases.