JPH075087U - Pyroelectric type human body detection device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a pyroelectric human body detector that can continuously detect far infrared rays without generating sound even if a shield plate that blocks far infrared rays input to a pyroelectric type sensor moves. . [Configuration] A shield plate 7 is arranged in front of the pyroelectric sensor 1,
This is rotated by the ammeter type rotary machine 5, and the shield plate 7 is controlled to open, close, and open each time there is incidence of far infrared rays, so that the far infrared rays RI are interrupted and the far infrared rays RI are continuously incident. Even so, it is characterized in that the pyroelectric sensor 1 is operated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pyroelectric human body detection device suitable for automatically detecting a state change of an elderly person living alone in a nursing home.

[0002]

[Prior art]

 If it is possible to detect an old man living alone in a nursing home or the like, or if an sleeping old man starts to wander and leaves the bed, the abnormality of the old man can be immediately known and the management becomes easy.

[0003]

[Problems to be solved by the device]

 However, if a normal detector, such as a TV camera, is used to detect a person, appropriate lighting is also required, and the old man may be worried about this and refuse the installation.

Attempts to use detectors that are smaller and less visible than television cameras do not have sufficient sensitivity and are not suitable for this purpose.

On the other hand, a pyroelectric sensor is suitable for detecting a human body. It detects heat rays from the human body (far-infrared rays) and is small and has high sensitivity. It can detect changes in heat rays that occur and disappear, but it does not change heat rays that do not change. When it is first incident, it responds only once. Therefore, there is a problem that even if a constant heat ray is emitted from a person who is bedridden or falls and loses freedom, it cannot be detected by the pyroelectric sensor because it is not a changing heat ray.

Therefore, a shutter that is always open is provided in front of the pyroelectric sensor, and when the pyroelectric sensor detects a heat ray, the shutter is temporarily closed to extinguish the incidence of thermal energy and then opens again. A pyroelectric type human body detection device provided with a driving means has been proposed (see Japanese Utility Model Application No. 6076).

By the way, in the pyroelectric type human body detection device as well, the shutter is moved by the rotation of the motor. Therefore, sound is generated each time the shutter moves, which causes a problem that the elderly and sick people feel uneasy.

The present invention has been made to solve the above-mentioned problems, and does not generate sound even if a shield plate that shields far-infrared rays that enter the pyroelectric sensor moves, and thus continuous sound is generated. Then, it aims at obtaining the pyroelectric type human body detection apparatus which can detect far infrared rays.

[0009]

[Means for Solving the Problems]

 The pyroelectric type human body detection device according to the present invention includes a pyroelectric type sensor having a Fresnel lens mounted on the front surface for detecting far infrared rays, a shutter arranged in front of the Fresnels, and the pyroelectric type sensor. In a pyroelectric type human body detection device comprising a shutter drive means for closing and returning the shutter from an open state for a certain period of time each time an infrared ray is detected, the shutter drive means is rotated with the shutter attached. The current meter type rotating machine having a shaft, and an energizing means for closing the shutter by energizing the ammeter type rotating machine for a certain period of time.

[0010]

[Action]

 In the present invention, since the shield plate for shielding far infrared rays input to the pyroelectric sensor is attached to the rotating shaft of the ammeter-type rotary machine, the shield plate is opened from the position where it covers the Fresnel lens to the position where it is released. On the contrary, no sound is generated even when moving, and far infrared rays that are continuously incident can be detected.

[0011]

【Example】

 1 and 2 are a front view and a side view showing an embodiment of the present invention. In these figures, reference numeral 1 is a pyroelectric sensor, a Fresnel lens 2 is attached to the front surface, and collects the weak far-infrared rays RI generated by the human body, which is a heat source, and inputs it to the pyroelectric sensor 1. . Reference numeral 3 denotes a substrate, on which various electronic components 4 are mounted and electrically connected together with the pyroelectric sensor 1 and the Fresnel lens 2. An ammeter type rotating machine 5 has a driving piece 6 corresponding to a finger needle which is rotated by an electric current, and a shield plate 7 is attached to the tip thereof. 1 and 2, in the case where no current is flowing through the ammeter-type rotating machine 5, the so-called finger position is 0, and the shield plate 7 is located at a position away from the front surface of the Fresnel lens 2. ing. Further, when the current is gradually increased and applied to the ammeter-type rotating machine 5, the driving piece 6 is rotated in the direction of arrow A so that the shield plate 7 is at a position to shield the pyroelectric sensor 1. The current flow is regulated and the position of the ammeter-type rotating machine 5 is set.

FIG. 3 is a block diagram showing an electric system of the present invention. The same reference numerals as those in FIG. 1 denote the same parts, 8 is a band limiting amplifier, 9 is a waveform shaping circuit, 10 is an output circuit, and 11 is a conducting circuit. Then, it comprises a monostable circuit 12 and an ammeter type rotary machine drive circuit 13.

Next, the operation will be described. When the output from the pyroelectric sensor 1 is amplified by the band limiting amplifier 8 and exceeds the threshold value of the waveform shaping circuit 9, a shaped waveform is output from the output circuit 10. Then, at the same time, the monostable circuit 12 is activated to generate one pulse, and when this is energized from the ammeter-type rotary machine drive circuit 13 to the ammeter-type rotary machine 5, the current gradually increases and the drive piece 6 is removed. Since it rotates in the direction of arrow A in FIG. 1, the shielding plate 7 shields the Fresnel lens 2. Therefore, the pyroelectric sensor 1 does not detect the far infrared ray RI. At this time, in the monostable circuit 12, even if the pyroelectric sensor 1 has no thermal energy, the time is determined so that the pyroelectric sensor 1 outputs the output voltage until the output voltage reaches zero. When the monostable circuit 12 returns, the drive currents of the ammeter-type rotary machine drive circuit 13 and the ammeter-type rotary machine 5 gradually decrease to 0, so that the drive piece 6 gradually moves in the direction opposite to the arrow A direction. It rotates and returns to the initial position.

Then, since the front surface of the Fresnel lens 2 is released from the shielding of the shielding plate 7, the far-infrared ray RI is input to the pyroelectric sensor 1 via the Fresnel lens 2.

At this time, if the human body as the heat source moves and the input of the far infrared ray RI is lost, the pyroelectric sensor 1 does not operate and does not output.

If the human body does not move and the far-infrared ray RI is input from the heat source, the pyroelectric sensor 1 is activated again, and the above operation is repeated to generate an output.

It is needless to say that various types such as a movable coil type and a movable iron piece type can be used as the ammeter type rotating machine 5.

[0018]

[Effect of device]

 As described above, according to the present invention, a pyroelectric sensor having a Fresnel lens mounted on the front surface for detecting far infrared rays, a shutter arranged on the front surface of the Fresnels, and the pyroelectric sensor having far infrared rays R1 In a pyroelectric type human body detection device including a shutter drive unit that closes the shutter for a certain period of time and returns it to the open state each time when the shutter is detected, the shutter drive unit has a rotation shaft to which the shutter is attached. It consists of an ammeter-type rotating machine and an energizing means that closes the shutter by energizing this ammeter-type rotating machine for a certain period of time.Therefore, no sound is generated by opening and closing the shielding plate, so that it can be noticed by the elderly and sick It has the advantage of being able to detect the human body continuously, without feeling anxious about the sound.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

2 is a side view of the embodiment of FIG. 1. FIG.

FIG. 3 is a block diagram showing an electric system of the present invention.

[Explanation of symbols]

 1 Pyroelectric type sensor 2 Fresnel lens 5 Ammeter type rotating machine 6 Driving piece 7 Shielding plate 8 Band limiting amplifier 9 Waveform shaping circuit 10 Output circuit 11 Energizing circuit 12 Monostable circuit 13 Ammeter type rotating machine driving circuit

Claims (1)

[Scope of utility model registration request] 1. A pyroelectric sensor having a Fresnel lens attached to the front surface for detecting far infrared rays, a shutter arranged on the front surface of the Fresnels, and the shutter every time the pyroelectric sensor detects far infrared rays. In a pyroelectric type human body detection device comprising: a shutter driving means that closes and returns to the open state for a certain period of time, wherein the shutter driving means is an ammeter type rotating machine having a rotating shaft to which the shutter is attached, A pyroelectric type human body detection device comprising: an ammeter-type rotating machine which is energized for a fixed time to close the shutter.