JPH0732529U - Infrared human body detector - Google Patents

Abstract

(57) [Abstract] [Purpose] It relates to the change of the detection area of the infrared human body detection device, and the deletion of the infrared detection zone that constitutes the detection area and the restoration to the original state can be done with the minimum parts and simple configuration. It is something that will be realized. In an infrared human body detection device equipped with an infrared detection element and an optical system, a plurality of support mechanisms are provided to detachably fix a light blocking plate that blocks a part of infrared energy to be collected. The light shielding plate has a shape such that the amount of infrared energy to be shielded is changed by changing the mounting direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an infrared human body detection device that detects infrared energy emitted by a human body and detects the movement of the infrared energy with high sensitivity, and detects an unnecessary detection zone in a warning area composed of a plurality of detection zones. It is related to the technology of freely cutting or returning to the original detection range.

[0002]

[Prior art]

 In this type of conventional device, it is possible to cut unnecessary detection zones by directly attaching an adhesive seal or the like to the optical system that collects infrared energy from different directions to the infrared detection element. Was used. In the case of a device that uses a so-called multi-parabolic mirror that combines multiple parabolic reflectors as an optical system, the parabolic reflector that is no longer needed is cut to the size of the reflector. Black tape (with low infrared reflectance) was attached. In addition, when a Fresnel lens with multiple optical axes formed on a single polyethylene sheet was used as the optical system, it was made of a material that did not transmit infrared energy to the front or back surface of the corresponding Fresnel lens. I was sticking tape.

As another conventional example, a light shielding plate is attached from the beginning on the optical path of the infrared ray energy-condensing zone formed by the infrared detecting element and the condensing optical system, and infrared rays are emitted. In some cases, the light blocking plate was deleted from the optical path to be passed. In this case, a resin molded part having a cuttable structure was used as the light shield plate. However, each of the conventional techniques has the following disadvantages.

[0004]

[Problems to be solved by the device]

 First, in the method of directly attaching a seal or the like to a multi-parabolic mirror or Fresnel lens for the purpose of eliminating the function of the optical system, the seal is accurately processed (cut out) according to the size of the corresponding optical system. ) Is required, and since the work of properly sticking the cut seal on the surface of the optical system must be performed, precision is required in both processing and positioning. Also, when a tape made of a material that does not transmit infrared rays is attached to the Fresnel lens, even if the tape is attached to the inside of the Fresnel lens, its location is known from the outside and it is used as an intruder detection device. When doing so, there was the inconvenience that the intruder was informed in advance of the unwarranted direction. In this type of infrared human body detection device that employs a Fresnel lens, at the same time that infrared energy is collected by the Fresnel lens, an indicator lamp such as a red LED (indicating that the human body is detected) provided inside the lens (inside the device) is displayed. There is also a problem that the tape attached to erase unnecessary detection zones makes it difficult to see the light of this operation indicator light. It was

Further, in the conventional example in which the light shielding plate as a molded part is cut off and used appropriately, most of the light shielding plate is cut off in order to erase a very small unnecessary detection zone. It was necessary to use and was troublesome. Also, since the cut-off plate that was once cut off cannot be restored, it was virtually impossible to cut off another detection zone later.

[0006]

[Means for Solving the Problems]

 In order to solve these problems, the present invention cuts off a part of the collected infrared energy with a light blocking plate arranged between the infrared detecting element and the optical system. The mounting position can be arbitrarily changed.

[0007]

[Action]

 According to the present invention, by devising the mounting position and shape of the light shielding plate, it is possible to obtain a plurality of light shielding patterns of the detection zone required for one type of light shielding plate, reducing the number of parts and simplifying the structure. While realizing the above, we were able to realize a configuration in which restoration to the original state could be performed freely.

[0008]

【Example】

 FIG. 1 is a sectional view of an infrared human body detection device of the present invention. The chassis 6 is fixed to the ceiling surface, and the cover 5 to which the Fresnel lens 4 is attached is united with the chassis 6 to form a container that covers the entire infrared human body detection device. An infrared detecting element 7 is mounted on a printed circuit board 8 inside, and the printed circuit board 8 further processes a signal from the infrared detecting element 7 and outputs a detection signal, an input / output terminal and an operation indicator lamp. Etc. have been implemented. Infrared energy from different directions (in this embodiment, five optical systems are used) is collected by the infrared ray detecting element 7 by a plurality of optical systems provided in the Fresnel lens 4. The cover 5 is provided with a mounting groove 2 and a mounting groove 3 as a support mechanism for supporting the light shielding plate 1.

FIG. 2A is a view of the cover 5 (where the Fresnel lens is fixed) removed and seen from the direction AA of FIG. The cover 5 has a mounting groove 2 and a mounting groove 3 each of which has two Fresnel lenses 4 sandwiched therebetween. In this figure, the light shield plate 1 is fixed only to the mounting groove 2, and the infrared energy focused by the leftmost optical system is blocked by the light shield plate 1. When the light shield plate 1 is not used, the detection area formed by the Fresnel lens 4 and the infrared detecting element 7 is fan-shaped as shown in FIG. 2 (b). FIG. 2B shows that the entire detection area is formed by a total of five detection zones, one under the device fixed to the ceiling and two under the device. The zone indicated by the broken line on the left side in this figure is the portion that is cut off and deleted by the light shielding plate shown in FIG. 2 (a).

FIG. 3A shows a state in which the light shielding plate 1 is fixed in the opposite direction to the fixed state shown in FIG. 2A. Since the light shielding plate 1 is not line-symmetric with respect to the straight line connecting the two mounting grooves that face each other with the Fresnel lens 4 in between, it is possible to change the mounting direction by changing the mounting direction as shown in FIG. The blocking range of infrared rays collected by the optical system can be changed. In the case of Fig. 3 (a), both the infrared energies collected by the first and second optical systems from the left side are cut off, and the two detection zones shown by the broken line in Fig. 3 (b) are deleted. Has been done. Even when the light shield plate 1 is attached to the attachment groove 3 provided in the cover 5, the first and second detection zones from the right side of the detection area are deleted by the same principle as shown in FIGS. 2 and 3. It will be. The detection zones shown in Fig. 2 and Fig. 3 show the case where the detection elements in the infrared detection element are rectangular, but when the detection elements have other shapes, the cross sections of the five detection zones are It will be shaped accordingly.

As described above, in the present embodiment, by using four mounting grooves and two light shielding plates having the same shape, nine combinations of detection areas can be obtained. FIG. 4 is a diagram showing the shape of the light shield plate. The circles shown above are directional markings used to specify the direction for the mounting groove. By displaying different symbols on the four mounting groove sides, it becomes easier to explain the relationship between the fixed state (mounting direction) of the light blocking plate and the realized detection area. In this embodiment, as the light shield plate, a transparent vinyl chloride plate material punched with a die is adopted. The light shield plate may be made of another material as long as it does not transmit infrared rays emitted by the human body. In this embodiment, the mounting groove has a structure in which the light shielding plate is inserted along the longitudinal direction thereof. In this structure, one side is inserted into the groove and the other side is bent and then inserted. Other than this method, any structure may be used as long as the light blocking plate is fixed in two different directions and can be easily removed.

In the present embodiment, an infrared human body detection device having a plurality of detection zones has been described by using two identical light shielding plates to realize a plurality of detection areas. Even if is increased, a similar configuration can be realized by the same principle. Further, the present invention can be implemented not only by a Fresnel lens but also by an apparatus using another optical system such as a multi-parabolic mirror.

[0013]

[Effect of device]

 As described above, according to the present invention, it is not necessary to cut out and paste or peel off the tape that blocks infrared rays as in the conventional case, and the required detection area can be obtained by using one or more light blocking plates of the same shape. Has been obtained and workability has improved. Also, since only one type of light shield plate is required, the number of parts is reduced, and since it can be attached and removed freely, the detection area can be changed as often as necessary. As a material for the light shield plate, we adopted vinyl chloride, which blocks infrared rays, is easy to process, and has a low material cost, so we were able to keep the total unit price down. Moreover, since transparent vinyl chloride was used, the light of the operation indicator light was not interrupted even when the light shielding plate was fixed, and it was possible to eliminate the restrictions on the location of the operation indicator lamp in the device.

[Brief description of drawings]

FIG. 1 is a sectional view of an infrared human body detection device of the present invention.

FIG. 2 is a diagram showing one fixed state of a light shielding plate in this embodiment and a detection area realized at that time.

FIG. 3 is another fixing state of the light shielding plate in this embodiment,
It is the figure which showed the detection area realized at that time.

FIG. 4 is a view showing a shape of a light shielding plate used in the product of the present embodiment.

[Explanation of symbols]

 1. Light shield 2. Mounting groove 3. Mounting groove 4. Fresnel lens 5. Cover 6. Chassis 7. Infrared detector 8. Printed board

Claims (1)

[Scope of utility model registration request] In an infrared human body detection device including an infrared detection element and a plurality of optical systems arranged within a viewing angle of the infrared detection element and configured to focus infrared energy from different directions on the infrared detection element, an attempt is made to collect light. A support mechanism for removably fixing a shield plate that shields a part of the total infrared energy is provided, and the shield plate changes the mounting direction of the shield plate so that the amount of shielded infrared energy changes. An infrared human body detection device having a shape, wherein the support mechanism is provided at a plurality of positions, and by using one or more types of light shielding plates, an arbitrary infrared energy light shielding pattern can be obtained.